Public issue detail
perl is stuck in a likely busy poll loop: 100.00% of sampled CPU passed through perf_ctx_enable, with repeated thread backtraces show 1 thread(s) around 0x00007f82eb9e87d2 in ?? () from target:<path>.
Last seen: 2026-05-28 21:33 UTC. Public JSON: /v1/issues/019e4743-6f51-7fc1-b372-9900d37706a1
Fixer does not have a ready diff or triage handoff for this issue yet, but it does have a published diagnosis-only result. This is the clearest current explanation of what workers found.
perl likely remains stuck in a busy-poll loop. A diagnosis report and patch proposal were created locally.
## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.
## Patch Pass
You are working on a bounded fixer proposal.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Produce the smallest reasonable patch for the target repository, keep the change upstreamable, prefer the clearest control flow available, and do not keep avoidable `goto` when a simpler structure would read better. Before introducing new file, process, allocation, locking, networking, or platform APIs, inspect nearby code and project contribution docs for existing helpers or compatibility wrappers and use those local patterns unless you can explain why they do not fit. Validate from a reproducible workspace-root entrypoint before falling back to focused leaf commands; if a build or test cannot run, report the exact command, the exact blocker, and any narrower check you ran instead. During validation, also try one bounded independent reproduction of the collected failure signal when it is safe and cheap, such as a failing test, smoke command, perf/strace comparison, or before/after runtime check. Only use `reproduced` if that command or test actually reproduced the failure; otherwise keep `observed` and report the reproduction blocker. The final explanation must connect the observed issue evidence to the actual code change, not just paraphrase the diff. Write like a maintainer is going to read the patch mail cold: explain the bug in plain language, define subsystem-specific jargon the first time you need it, and make the causal story obvious. Explicitly classify evidence confidence as `reproduced`, `observed`, or `inferred`: `reproduced` means you reproduced the failure locally; `observed` means Fixer has direct crash/log/trace evidence but you did not independently reproduce it; `inferred` means the source patch is not pull-request-ready, so do not leave a source diff unless you first gather stronger observed/reproduced evidence; otherwise return a no-patch diagnosis/report. For any source-changing `observed` patch, say explicitly in `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. Security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior need reproduced evidence plus explicit security-impact analysis before leaving a source diff; otherwise return a no-patch diagnosis/report for human review. If you introduce non-obvious state translation, index remapping, or backend split logic, add a short source comment that explains the invariant being preserved.
Start by explaining the likely root cause from the collected perf, strace, and /proc evidence. If you cannot land a safe patch, leave a diagnosis that is strong enough for an upstream bug report.
Interpreter process expectation: when the hot process is Python, Perl, shell, Node, Ruby, PHP, Lua, or another interpreter, inspect both the runtime and the script/application entrypoint from `details.interpreter_process`. Prefer the script or application package when evidence points there; do not patch the interpreter runtime merely because the hot binary is `python`, `perl`, `bash`, or similar. Runtime fixes are welcome only after checking the entrypoint and explaining why the runtime mishandles the workload or why running bad code faster/safer is itself the right upstream fix.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Keep the change narrowly scoped and summarize validation clearly.
In every authoring pass, your final response must start with `Subject: <single-line git commit subject>` and then include these markdown sections exactly:
## Commit Message
A short upstream-friendly explanation of what changed and why. Write it in plain language that a maintainer can follow without local complaint context. If you use subsystem jargon, define it immediately.
## Evidence Confidence
Exactly one word: `reproduced`, `observed`, or `inferred`. Use `reproduced` only when you reproduced the failure locally with a command or test, and include that command/test in `## Validation`. Use `observed` when Fixer has direct crash/log/trace evidence but you did not independently reproduce it. If `## Git Add Paths` lists source files for an `observed` patch, `## Issue Connection` must explicitly say the failure was observed by Fixer and not independently reproduced. Security-sensitive source changes touching authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior require reproduced evidence and explicit security-impact analysis; otherwise list `None` under `## Git Add Paths` and write a no-patch diagnosis/report. Use `inferred` for profiler/strace/indirect evidence; inferred responses may be no-patch diagnoses or reports, but inferred source patches are not pull-request-ready until stronger evidence is gathered.
## Issue Connection
Write this as maintainer-facing patch mail, not as local Fixer notes. Cover four things explicitly in readable sentences: the user-visible symptom or the exact collected signal, the code-level cause or the cautious inference from evidence, the specific change you made, and the expected effect. Do not invent a reproducer, command line, crash, or user-visible failure that is not present in the evidence bundle. If the evidence is direct-but-not-reproduced, say it was observed by Fixer and not independently reproduced. If the evidence is indirect and you did not gather stronger evidence, do not leave a source diff; write a no-patch diagnosis/report instead. Include an explicit effect sentence such as `The expected effect is ...`, `This should reduce ...`, or `This prevents ...` for source patches. If the logic is non-obvious in code, mention that you added a short explanatory comment.
## Git Add Paths
List the repo-relative paths that belong in the final patch, one per line. Use `None` only when you intentionally made no source changes. Include intentionally new files, and do not list generated build artifacts.
## Validation
List the checks you ran, or say clearly that you could not run them. Include the independent reproduction command/test and result when `## Evidence Confidence` is `reproduced`; if reproduction was attempted but blocked, name the exact blocker and keep confidence at `observed` or `inferred`.
Before editing, read the plan at `./plan-output.txt` and follow it unless the code proves part of it wrong. If you change course, say so explicitly in the final write-up instead of silently drifting from the plan.
## Review Pass 1
You are reviewing a freshly generated fixer patch.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Review the first patch pass. The original pre-edit snapshot is available at `./source` for diffing.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout. The latest author response is at `./patch-output.txt`. Inspect the current code and changed paths like a strict code reviewer. Focus on correctness, regressions, maintainability, awkward control flow such as avoidable `goto`, missing validation, weak or non-gittable commit message text, and explanations that fail to connect the observed issue evidence to the code change. Also review the maintainer experience: the patch mail should be easy to accept upstream, the user-visible bug should be explained in plain language, subsystem-specific jargon should be defined when first used, and any non-obvious state translation or index remapping in code should have a short explanatory comment. Reject patches that omit `## Evidence Confidence`, use anything other than `reproduced`, `observed`, or `inferred`, or sound more certain than that evidence level allows. Reject patches that claim `reproduced` unless `## Validation` names the concrete reproduction command or test and its result. Reject source patches in security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior unless the author reproduced the behavior and explicitly analyzed the security impact of the change; observed-only evidence should become a diagnosis/report, not a PR-ready source diff. Reject patches that invent a reproducer, command line, crash, or user-visible failure not present in the evidence bundle; indirect profiler or strace evidence may justify a cautious mitigation, but the author must say it is indirect instead of presenting it as a confirmed upstream bug. Reject patches that introduce generic libc/std APIs when nearby code or project docs provide a local compat/helper API for the same job, unless the author explicitly justifies the exception. Reject validation that only reports a leaf object/syntax build when a project-level configure/build/test entrypoint exists and was not attempted; if a full build cannot run, the author must show the exact failed command and blocker.
Do not apply code changes in this pass.
Return a short markdown review report. The first non-empty line must be exactly one of:
RESULT: ok
RESULT: fix-needed
If you choose `RESULT: fix-needed`, add a `## Findings` section with concrete, actionable items.## Plan Pass
## Problem
Fixer observed `munin-node` running as `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` in repeated `pselect6` calls. The retained evidence does not tie the wakeups to a Perl-level stack or Munin source line, and the syscall excerpts show blocking waits of about 1.8-2.0 seconds with the process sleeping and only 0.9% CPU, which does not substantiate a tight runaway CPU loop.
## Evidence Confidence
observed
## Proposed Subject
No source patch in this pass: report the evidence gap and collect a bounded Munin-level reproduction before editing.
## Patch Plan
Do not patch Perl or Munin yet. The evidence identifies the script entrypoint, but it lacks a language-level stack and appears to show normal blocking `pselect6` timeouts rather than a confirmed busy loop.
Use Munin’s local conventions from `CONTRIBUTING.md` and `HACKING.pod`: strict/warnings Perl style, taint-aware invocation, existing module style, and project test entrypoints. Relevant local helpers/conventions found: `Munin::Common::Timeout::do_with_timeout`, `Munin::Node::Server::_net_read`, `_net_write`, `Munin::Node::Config`, and Net::Server-based daemon setup. No prior Fixer patch was present beyond the baseline commit.
If additional evidence later shows real CPU churn in Munin code, plan a narrow upstream-style patch in `lib/Munin/Node/Server.pm` or the specific helper implicated by the Perl stack, following existing helper APIs and avoiding awkward control flow such as avoidable `goto`.
## Risks
A timing/throttling source change based only on this bundle would be speculative and could alter daemon responsiveness or connection handling without proving it fixes the observed workload.
The `pselect6` timeout cadence may come from Net::Server or normal idle daemon behavior, not from Munin application logic. Treating it as a bug now risks replacing expected blocking behavior with an unnecessary workaround.
## Validation
Before any future patch, try the project-level entrypoint from the workspace root: `make`. There is no `make check` target in the inspected `Makefile`; the available project test target is `make test`.
For bounded independent reproduction, run a short foreground `munin-node` smoke under syscall tracing from a clean checkout after `make`, using the script entrypoint rather than Perl runtime internals, for example: `timeout 8s strace -ttT -f -e trace=pselect6,select,poll,ppoll,nanosleep,clock_nanosleep perl -Ilib -T script/munin-node --foreground --config t/config/munin-node.conf --servicedir plugins/node.d.debug --sconfdir t/config/plugin-conf.d`. Only claim reproduction if that command shows high-frequency nonblocking poll/select returns or measurable CPU churn tied to Munin. Otherwise validate the diagnosis with `perl -Ilib -c lib/Munin/Node/Server.pm` and report no patch.
## Patch Pass
Subject: Report inconclusive munin-node poll-loop evidence
## Commit Message
No source patch is included. Fixer observed `munin-node` under Perl in repeated `pselect6` samples, but the retained `/proc`, perf, and strace data point to a sleeping process in a timed select wait, not a locally reproduced CPU spin.
## Evidence Confidence
inferred
## Issue Connection
The collected signal is `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` sampled around `select()`/`pselect6`, with `wchan` at `poll_schedule_timeout` and strace lines returning after about 1.8-2.0 seconds. The likely root cause is normal idle or timer-driven waiting in the `munin-node` server loop, not a proven tight busy-poll loop.
I inspected the Perl entrypoint (`script/munin-node`) before considering the runtime, as well as `lib/Munin/Node/Server.pm` and `Munin::Common::Timeout::do_with_timeout`. The relevant local helpers are `_net_read`, `_net_write`, `do_with_timeout`, `Munin::Common::Logger`, and the Net::Server hook structure. Munin’s contribution docs require strict/warnings Perl style and taint-aware invocation.
Following the saved plan, I did not make a source change. Any plausible patch here would alter daemon timing/throttling behavior without reproduced evidence or a Perl-level stack tying the observed wait to faulty Munin logic. The expected effect of this no-patch diagnosis is to avoid an upstream patch that changes connection timing based on an inconclusive profiler signal.
## Git Add Paths
None
## Validation
Project-level validation attempted from the workspace root:
`make`
Failed before building Munin code because `Module::Build` is missing:
`Can't locate Module/Build.pm in @INC ... at Build.PL line 80.`
`make: *** [Makefile:149: Build] Error 2`
There is no `make check` target in the inspected `Makefile`.
Focused checks run:
`perl -Ilib -c lib/Munin/Node/Server.pm` passed: syntax OK.
`perl -T -Ilib -c script/munin-node` passed: syntax OK.
Independent reproduction attempt:
`timeout 8s strace -ttT -f -e trace=pselect6,select,poll,ppoll,nanosleep,clock_nanosleep perl -Ilib -T script/munin-node ...`
Blocked by sandbox ptrace restrictions: `PTRACE_TRACEME: Operation not permitted` and `ptrace(PTRACE_SEIZE, 5): Operation not permitted`.
Fallback foreground smoke with absolute paths exited with status `1` and no stdout/stderr, so it did not reproduce a long-running poll loop or CPU churn.
## Review Pass 1
RESULT: ok
No source changes are present in the workspace, so there is no code diff to reject. The no-patch diagnosis is consistent with the evidence limits: the bundle is profiler/strace-driven, the process was sleeping in `poll_schedule_timeout`, and no local reproduction tied the signal to faulty Munin code.
The author checked contribution docs and named relevant Munin helpers (`do_with_timeout`, `_net_read`, `_net_write`, logging, Net::Server hooks). Validation attempted the project-level `make` first, reported the `Module::Build` blocker, then ran focused syntax checks and documented the ptrace blocker for the independent strace reproduction.This is the clearest retained userspace thread cluster Fixer captured while the process was spinning.
0x00007f82eb9e87d2 in ?? () from target:<path>
0x00007f82eb9e87ed in ?? () from target:<path>
0x00007f82eba686cf in select () from target:<path>
0x000055b5551b8ee4 in ?? ()
0x000055b55521a496 in Perl_runops_standard ()
0x000055b555100b85 in perl_run ()
0x000055b5550d35ae in main ()These are suggestions based on sanitized trigram similarity plus structured fields like package, subsystem, classification, and wait site. They are not auto-merged.
perl is stuck in a likely busy poll loop: 100.00% of sampled CPU passed through Perl_runops_standard, with repeated pselect6 x4.
Why this looks related: same classification, same package, same source package, same subsystem, same target, same wait site
Last seen: 2026-07-10 03:06 UTC. Public page: /issues/019d4017-20f8-7752-9734-0bcd71623118. Public JSON: /v1/issues/019d4017-20f8-7752-9734-0bcd71623118
perl is stuck in a likely busy poll loop: 100.00% of sampled CPU passed through native_sched_clock, with repeated thread backtraces show 1 thread(s) around 0x00007f5e185decb2 in ?? () from target:<path>.
Why this looks related: same classification, same package, same source package, same subsystem, same target, same wait site
Last seen: 2026-07-07 21:30 UTC. Public page: /issues/019f343d-8e8c-7c63-9a54-a9a5e87db750. Public JSON: /v1/issues/019f343d-8e8c-7c63-9a54-a9a5e87db750
perl is stuck in a likely busy poll loop: 100.00% of sampled CPU passed through update_sd_lb_stats.constprop.0, with repeated thread backtraces show 1 thread(s) around 0x00007f9a01ce47d2 in ?? () from target:<path>.
Why this looks related: same classification, same package, same source package, same subsystem, same target, same wait site
Last seen: 2026-07-04 21:40 UTC. Public page: /issues/019f2bc3-ddea-71c0-a8a5-ad543673ae26. Public JSON: /v1/issues/019f2bc3-ddea-71c0-a8a5-ad543673ae26
perl is stuck in a likely busy poll loop: 100.00% of sampled CPU passed through Perl_hv_iternext_flags, with repeated thread backtraces show 1 thread(s) around 0x00007f421c5d77d2 in ?? () from target:<path>.
Why this looks related: same classification, same package, same source package, same subsystem, same target, same wait site
Last seen: 2026-07-04 05:55 UTC. Public page: /issues/019f1022-894c-7852-a604-32786bebab0d. Public JSON: /v1/issues/019f1022-894c-7852-a604-32786bebab0d
perl is stuck in a likely busy poll loop: 100.00% of sampled CPU passed through do_select, with repeated thread backtraces show 1 thread(s) around 0x00007f4392f987d2 in ?? () from target:<path>.
Why this looks related: same classification, same package, same source package, same subsystem, same target, same wait site, very similar public summary
Last seen: 2026-06-28 21:10 UTC. Public page: /issues/019db582-c9cc-78d0-8104-f1490ac23dc9. Public JSON: /v1/issues/019db582-c9cc-78d0-8104-f1490ac23dc9
rsync is stuck in a likely busy poll loop: 24.28% of sampled CPU passed through clear_page_erms, with repeated thread backtraces show 1 thread(s) around 0x00007f1f5169a7d2 in ?? () from target:<path>.
Why this looks related: same classification, same subsystem, same wait site
Last seen: 2026-07-02 23:40 UTC. Public page: /issues/019e1a88-12a2-79f0-8a00-0794e663896a. Public JSON: /v1/issues/019e1a88-12a2-79f0-8a00-0794e663896a
This issue has 168 recorded worker attempts. Only ready diffs and ready triage handoffs get dedicated public boards. Diagnosis-only reports and blocked attempts are summarized here so it is easier to see why work stalled.
No ready patch attempts, ready triage handoffs, explained impossible attempts, or other attempt states.
Showing the full published public attempt history for this issue.
perl likely remains stuck in a busy-poll loop. A diagnosis report and patch proposal were created locally.
## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.
## Patch Pass
You are working on a bounded fixer proposal.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Produce the smallest reasonable patch for the target repository, keep the change upstreamable, prefer the clearest control flow available, and do not keep avoidable `goto` when a simpler structure would read better. Before introducing new file, process, allocation, locking, networking, or platform APIs, inspect nearby code and project contribution docs for existing helpers or compatibility wrappers and use those local patterns unless you can explain why they do not fit. Validate from a reproducible workspace-root entrypoint before falling back to focused leaf commands; if a build or test cannot run, report the exact command, the exact blocker, and any narrower check you ran instead. During validation, also try one bounded independent reproduction of the collected failure signal when it is safe and cheap, such as a failing test, smoke command, perf/strace comparison, or before/after runtime check. Only use `reproduced` if that command or test actually reproduced the failure; otherwise keep `observed` and report the reproduction blocker. The final explanation must connect the observed issue evidence to the actual code change, not just paraphrase the diff. Write like a maintainer is going to read the patch mail cold: explain the bug in plain language, define subsystem-specific jargon the first time you need it, and make the causal story obvious. Explicitly classify evidence confidence as `reproduced`, `observed`, or `inferred`: `reproduced` means you reproduced the failure locally; `observed` means Fixer has direct crash/log/trace evidence but you did not independently reproduce it; `inferred` means the source patch is not pull-request-ready, so do not leave a source diff unless you first gather stronger observed/reproduced evidence; otherwise return a no-patch diagnosis/report. For any source-changing `observed` patch, say explicitly in `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. Security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior need reproduced evidence plus explicit security-impact analysis before leaving a source diff; otherwise return a no-patch diagnosis/report for human review. If you introduce non-obvious state translation, index remapping, or backend split logic, add a short source comment that explains the invariant being preserved.
Start by explaining the likely root cause from the collected perf, strace, and /proc evidence. If you cannot land a safe patch, leave a diagnosis that is strong enough for an upstream bug report.
Interpreter process expectation: when the hot process is Python, Perl, shell, Node, Ruby, PHP, Lua, or another interpreter, inspect both the runtime and the script/application entrypoint from `details.interpreter_process`. Prefer the script or application package when evidence points there; do not patch the interpreter runtime merely because the hot binary is `python`, `perl`, `bash`, or similar. Runtime fixes are welcome only after checking the entrypoint and explaining why the runtime mishandles the workload or why running bad code faster/safer is itself the right upstream fix.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Keep the change narrowly scoped and summarize validation clearly.
In every authoring pass, your final response must start with `Subject: <single-line git commit subject>` and then include these markdown sections exactly:
## Commit Message
A short upstream-friendly explanation of what changed and why. Write it in plain language that a maintainer can follow without local complaint context. If you use subsystem jargon, define it immediately.
## Evidence Confidence
Exactly one word: `reproduced`, `observed`, or `inferred`. Use `reproduced` only when you reproduced the failure locally with a command or test, and include that command/test in `## Validation`. Use `observed` when Fixer has direct crash/log/trace evidence but you did not independently reproduce it. If `## Git Add Paths` lists source files for an `observed` patch, `## Issue Connection` must explicitly say the failure was observed by Fixer and not independently reproduced. Security-sensitive source changes touching authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior require reproduced evidence and explicit security-impact analysis; otherwise list `None` under `## Git Add Paths` and write a no-patch diagnosis/report. Use `inferred` for profiler/strace/indirect evidence; inferred responses may be no-patch diagnoses or reports, but inferred source patches are not pull-request-ready until stronger evidence is gathered.
## Issue Connection
Write this as maintainer-facing patch mail, not as local Fixer notes. Cover four things explicitly in readable sentences: the user-visible symptom or the exact collected signal, the code-level cause or the cautious inference from evidence, the specific change you made, and the expected effect. Do not invent a reproducer, command line, crash, or user-visible failure that is not present in the evidence bundle. If the evidence is direct-but-not-reproduced, say it was observed by Fixer and not independently reproduced. If the evidence is indirect and you did not gather stronger evidence, do not leave a source diff; write a no-patch diagnosis/report instead. Include an explicit effect sentence such as `The expected effect is ...`, `This should reduce ...`, or `This prevents ...` for source patches. If the logic is non-obvious in code, mention that you added a short explanatory comment.
## Git Add Paths
List the repo-relative paths that belong in the final patch, one per line. Use `None` only when you intentionally made no source changes. Include intentionally new files, and do not list generated build artifacts.
## Validation
List the checks you ran, or say clearly that you could not run them. Include the independent reproduction command/test and result when `## Evidence Confidence` is `reproduced`; if reproduction was attempted but blocked, name the exact blocker and keep confidence at `observed` or `inferred`.
Before editing, read the plan at `./plan-output.txt` and follow it unless the code proves part of it wrong. If you change course, say so explicitly in the final write-up instead of silently drifting from the plan.
## Review Pass 1
You are reviewing a freshly generated fixer patch.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Review the first patch pass. The original pre-edit snapshot is available at `./source` for diffing.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout. The latest author response is at `./patch-output.txt`. Inspect the current code and changed paths like a strict code reviewer. Focus on correctness, regressions, maintainability, awkward control flow such as avoidable `goto`, missing validation, weak or non-gittable commit message text, and explanations that fail to connect the observed issue evidence to the code change. Also review the maintainer experience: the patch mail should be easy to accept upstream, the user-visible bug should be explained in plain language, subsystem-specific jargon should be defined when first used, and any non-obvious state translation or index remapping in code should have a short explanatory comment. Reject patches that omit `## Evidence Confidence`, use anything other than `reproduced`, `observed`, or `inferred`, or sound more certain than that evidence level allows. Reject patches that claim `reproduced` unless `## Validation` names the concrete reproduction command or test and its result. Reject source patches in security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior unless the author reproduced the behavior and explicitly analyzed the security impact of the change; observed-only evidence should become a diagnosis/report, not a PR-ready source diff. Reject patches that invent a reproducer, command line, crash, or user-visible failure not present in the evidence bundle; indirect profiler or strace evidence may justify a cautious mitigation, but the author must say it is indirect instead of presenting it as a confirmed upstream bug. Reject patches that introduce generic libc/std APIs when nearby code or project docs provide a local compat/helper API for the same job, unless the author explicitly justifies the exception. Reject validation that only reports a leaf object/syntax build when a project-level configure/build/test entrypoint exists and was not attempted; if a full build cannot run, the author must show the exact failed command and blocker.
Do not apply code changes in this pass.
Return a short markdown review report. The first non-empty line must be exactly one of:
RESULT: ok
RESULT: fix-needed
If you choose `RESULT: fix-needed`, add a `## Findings` section with concrete, actionable items.## Plan Pass
## Problem
Fixer observed `munin-node` running as `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` in repeated `pselect6` calls. The retained evidence does not tie the wakeups to a Perl-level stack or Munin source line, and the syscall excerpts show blocking waits of about 1.8-2.0 seconds with the process sleeping and only 0.9% CPU, which does not substantiate a tight runaway CPU loop.
## Evidence Confidence
observed
## Proposed Subject
No source patch in this pass: report the evidence gap and collect a bounded Munin-level reproduction before editing.
## Patch Plan
Do not patch Perl or Munin yet. The evidence identifies the script entrypoint, but it lacks a language-level stack and appears to show normal blocking `pselect6` timeouts rather than a confirmed busy loop.
Use Munin’s local conventions from `CONTRIBUTING.md` and `HACKING.pod`: strict/warnings Perl style, taint-aware invocation, existing module style, and project test entrypoints. Relevant local helpers/conventions found: `Munin::Common::Timeout::do_with_timeout`, `Munin::Node::Server::_net_read`, `_net_write`, `Munin::Node::Config`, and Net::Server-based daemon setup. No prior Fixer patch was present beyond the baseline commit.
If additional evidence later shows real CPU churn in Munin code, plan a narrow upstream-style patch in `lib/Munin/Node/Server.pm` or the specific helper implicated by the Perl stack, following existing helper APIs and avoiding awkward control flow such as avoidable `goto`.
## Risks
A timing/throttling source change based only on this bundle would be speculative and could alter daemon responsiveness or connection handling without proving it fixes the observed workload.
The `pselect6` timeout cadence may come from Net::Server or normal idle daemon behavior, not from Munin application logic. Treating it as a bug now risks replacing expected blocking behavior with an unnecessary workaround.
## Validation
Before any future patch, try the project-level entrypoint from the workspace root: `make`. There is no `make check` target in the inspected `Makefile`; the available project test target is `make test`.
For bounded independent reproduction, run a short foreground `munin-node` smoke under syscall tracing from a clean checkout after `make`, using the script entrypoint rather than Perl runtime internals, for example: `timeout 8s strace -ttT -f -e trace=pselect6,select,poll,ppoll,nanosleep,clock_nanosleep perl -Ilib -T script/munin-node --foreground --config t/config/munin-node.conf --servicedir plugins/node.d.debug --sconfdir t/config/plugin-conf.d`. Only claim reproduction if that command shows high-frequency nonblocking poll/select returns or measurable CPU churn tied to Munin. Otherwise validate the diagnosis with `perl -Ilib -c lib/Munin/Node/Server.pm` and report no patch.
## Patch Pass
Subject: Report inconclusive munin-node poll-loop evidence
## Commit Message
No source patch is included. Fixer observed `munin-node` under Perl in repeated `pselect6` samples, but the retained `/proc`, perf, and strace data point to a sleeping process in a timed select wait, not a locally reproduced CPU spin.
## Evidence Confidence
inferred
## Issue Connection
The collected signal is `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` sampled around `select()`/`pselect6`, with `wchan` at `poll_schedule_timeout` and strace lines returning after about 1.8-2.0 seconds. The likely root cause is normal idle or timer-driven waiting in the `munin-node` server loop, not a proven tight busy-poll loop.
I inspected the Perl entrypoint (`script/munin-node`) before considering the runtime, as well as `lib/Munin/Node/Server.pm` and `Munin::Common::Timeout::do_with_timeout`. The relevant local helpers are `_net_read`, `_net_write`, `do_with_timeout`, `Munin::Common::Logger`, and the Net::Server hook structure. Munin’s contribution docs require strict/warnings Perl style and taint-aware invocation.
Following the saved plan, I did not make a source change. Any plausible patch here would alter daemon timing/throttling behavior without reproduced evidence or a Perl-level stack tying the observed wait to faulty Munin logic. The expected effect of this no-patch diagnosis is to avoid an upstream patch that changes connection timing based on an inconclusive profiler signal.
## Git Add Paths
None
## Validation
Project-level validation attempted from the workspace root:
`make`
Failed before building Munin code because `Module::Build` is missing:
`Can't locate Module/Build.pm in @INC ... at Build.PL line 80.`
`make: *** [Makefile:149: Build] Error 2`
There is no `make check` target in the inspected `Makefile`.
Focused checks run:
`perl -Ilib -c lib/Munin/Node/Server.pm` passed: syntax OK.
`perl -T -Ilib -c script/munin-node` passed: syntax OK.
Independent reproduction attempt:
`timeout 8s strace -ttT -f -e trace=pselect6,select,poll,ppoll,nanosleep,clock_nanosleep perl -Ilib -T script/munin-node ...`
Blocked by sandbox ptrace restrictions: `PTRACE_TRACEME: Operation not permitted` and `ptrace(PTRACE_SEIZE, 5): Operation not permitted`.
Fallback foreground smoke with absolute paths exited with status `1` and no stdout/stderr, so it did not reproduce a long-running poll loop or CPU churn.
## Review Pass 1
RESULT: ok
No source changes are present in the workspace, so there is no code diff to reject. The no-patch diagnosis is consistent with the evidence limits: the bundle is profiler/strace-driven, the process was sleeping in `poll_schedule_timeout`, and no local reproduction tied the signal to faulty Munin code.
The author checked contribution docs and named relevant Munin helpers (`do_with_timeout`, `_net_read`, `_net_write`, logging, Net::Server hooks). Validation attempted the project-level `make` first, reported the `Module::Build` blocker, then ran focused syntax checks and documented the ptrace blocker for the independent strace reproduction.perl likely remains stuck in a busy-poll loop. A diagnosis report and patch proposal were created locally.
## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.
## Patch Pass
You are working on a bounded fixer proposal.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Produce the smallest reasonable patch for the target repository, keep the change upstreamable, prefer the clearest control flow available, and do not keep avoidable `goto` when a simpler structure would read better. Before introducing new file, process, allocation, locking, networking, or platform APIs, inspect nearby code and project contribution docs for existing helpers or compatibility wrappers and use those local patterns unless you can explain why they do not fit. Validate from a reproducible workspace-root entrypoint before falling back to focused leaf commands; if a build or test cannot run, report the exact command, the exact blocker, and any narrower check you ran instead. During validation, also try one bounded independent reproduction of the collected failure signal when it is safe and cheap, such as a failing test, smoke command, perf/strace comparison, or before/after runtime check. Only use `reproduced` if that command or test actually reproduced the failure; otherwise keep `observed` and report the reproduction blocker. The final explanation must connect the observed issue evidence to the actual code change, not just paraphrase the diff. Write like a maintainer is going to read the patch mail cold: explain the bug in plain language, define subsystem-specific jargon the first time you need it, and make the causal story obvious. Explicitly classify evidence confidence as `reproduced`, `observed`, or `inferred`: `reproduced` means you reproduced the failure locally; `observed` means Fixer has direct crash/log/trace evidence but you did not independently reproduce it; `inferred` means the source patch is not pull-request-ready, so do not leave a source diff unless you first gather stronger observed/reproduced evidence; otherwise return a no-patch diagnosis/report. For any source-changing `observed` patch, say explicitly in `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. Security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior need reproduced evidence plus explicit security-impact analysis before leaving a source diff; otherwise return a no-patch diagnosis/report for human review. If you introduce non-obvious state translation, index remapping, or backend split logic, add a short source comment that explains the invariant being preserved.
Start by explaining the likely root cause from the collected perf, strace, and /proc evidence. If you cannot land a safe patch, leave a diagnosis that is strong enough for an upstream bug report.
Interpreter process expectation: when the hot process is Python, Perl, shell, Node, Ruby, PHP, Lua, or another interpreter, inspect both the runtime and the script/application entrypoint from `details.interpreter_process`. Prefer the script or application package when evidence points there; do not patch the interpreter runtime merely because the hot binary is `python`, `perl`, `bash`, or similar. Runtime fixes are welcome only after checking the entrypoint and explaining why the runtime mishandles the workload or why running bad code faster/safer is itself the right upstream fix.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Keep the change narrowly scoped and summarize validation clearly.
In every authoring pass, your final response must start with `Subject: <single-line git commit subject>` and then include these markdown sections exactly:
## Commit Message
A short upstream-friendly explanation of what changed and why. Write it in plain language that a maintainer can follow without local complaint context. If you use subsystem jargon, define it immediately.
## Evidence Confidence
Exactly one word: `reproduced`, `observed`, or `inferred`. Use `reproduced` only when you reproduced the failure locally with a command or test, and include that command/test in `## Validation`. Use `observed` when Fixer has direct crash/log/trace evidence but you did not independently reproduce it. If `## Git Add Paths` lists source files for an `observed` patch, `## Issue Connection` must explicitly say the failure was observed by Fixer and not independently reproduced. Security-sensitive source changes touching authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior require reproduced evidence and explicit security-impact analysis; otherwise list `None` under `## Git Add Paths` and write a no-patch diagnosis/report. Use `inferred` for profiler/strace/indirect evidence; inferred responses may be no-patch diagnoses or reports, but inferred source patches are not pull-request-ready until stronger evidence is gathered.
## Issue Connection
Write this as maintainer-facing patch mail, not as local Fixer notes. Cover four things explicitly in readable sentences: the user-visible symptom or the exact collected signal, the code-level cause or the cautious inference from evidence, the specific change you made, and the expected effect. Do not invent a reproducer, command line, crash, or user-visible failure that is not present in the evidence bundle. If the evidence is direct-but-not-reproduced, say it was observed by Fixer and not independently reproduced. If the evidence is indirect and you did not gather stronger evidence, do not leave a source diff; write a no-patch diagnosis/report instead. Include an explicit effect sentence such as `The expected effect is ...`, `This should reduce ...`, or `This prevents ...` for source patches. If the logic is non-obvious in code, mention that you added a short explanatory comment.
## Git Add Paths
List the repo-relative paths that belong in the final patch, one per line. Use `None` only when you intentionally made no source changes. Include intentionally new files, and do not list generated build artifacts.
## Validation
List the checks you ran, or say clearly that you could not run them. Include the independent reproduction command/test and result when `## Evidence Confidence` is `reproduced`; if reproduction was attempted but blocked, name the exact blocker and keep confidence at `observed` or `inferred`.
Before editing, read the plan at `./plan-output.txt` and follow it unless the code proves part of it wrong. If you change course, say so explicitly in the final write-up instead of silently drifting from the plan.
## Review Pass 1
You are reviewing a freshly generated fixer patch.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Review the first patch pass. The original pre-edit snapshot is available at `./source` for diffing.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout. The latest author response is at `./patch-output.txt`. Inspect the current code and changed paths like a strict code reviewer. Focus on correctness, regressions, maintainability, awkward control flow such as avoidable `goto`, missing validation, weak or non-gittable commit message text, and explanations that fail to connect the observed issue evidence to the code change. Also review the maintainer experience: the patch mail should be easy to accept upstream, the user-visible bug should be explained in plain language, subsystem-specific jargon should be defined when first used, and any non-obvious state translation or index remapping in code should have a short explanatory comment. Reject patches that omit `## Evidence Confidence`, use anything other than `reproduced`, `observed`, or `inferred`, or sound more certain than that evidence level allows. Reject patches that claim `reproduced` unless `## Validation` names the concrete reproduction command or test and its result. Reject source patches in security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior unless the author reproduced the behavior and explicitly analyzed the security impact of the change; observed-only evidence should become a diagnosis/report, not a PR-ready source diff. Reject patches that invent a reproducer, command line, crash, or user-visible failure not present in the evidence bundle; indirect profiler or strace evidence may justify a cautious mitigation, but the author must say it is indirect instead of presenting it as a confirmed upstream bug. Reject patches that introduce generic libc/std APIs when nearby code or project docs provide a local compat/helper API for the same job, unless the author explicitly justifies the exception. Reject validation that only reports a leaf object/syntax build when a project-level configure/build/test entrypoint exists and was not attempted; if a full build cannot run, the author must show the exact failed command and blocker.
Do not apply code changes in this pass.
Return a short markdown review report. The first non-empty line must be exactly one of:
RESULT: ok
RESULT: fix-needed
If you choose `RESULT: fix-needed`, add a `## Findings` section with concrete, actionable items.## Plan Pass
## Problem
Fixer observed `munin-node` running as `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` in repeated `pselect6` calls. The retained evidence does not tie the wakeups to a Perl-level stack or Munin source line, and the syscall excerpts show blocking waits of about 1.8-2.0 seconds with the process sleeping and only 0.9% CPU, which does not substantiate a tight runaway CPU loop.
## Evidence Confidence
observed
## Proposed Subject
No source patch in this pass: report the evidence gap and collect a bounded Munin-level reproduction before editing.
## Patch Plan
Do not patch Perl or Munin yet. The evidence identifies the script entrypoint, but it lacks a language-level stack and appears to show normal blocking `pselect6` timeouts rather than a confirmed busy loop.
Use Munin’s local conventions from `CONTRIBUTING.md` and `HACKING.pod`: strict/warnings Perl style, taint-aware invocation, existing module style, and project test entrypoints. Relevant local helpers/conventions found: `Munin::Common::Timeout::do_with_timeout`, `Munin::Node::Server::_net_read`, `_net_write`, `Munin::Node::Config`, and Net::Server-based daemon setup. No prior Fixer patch was present beyond the baseline commit.
If additional evidence later shows real CPU churn in Munin code, plan a narrow upstream-style patch in `lib/Munin/Node/Server.pm` or the specific helper implicated by the Perl stack, following existing helper APIs and avoiding awkward control flow such as avoidable `goto`.
## Risks
A timing/throttling source change based only on this bundle would be speculative and could alter daemon responsiveness or connection handling without proving it fixes the observed workload.
The `pselect6` timeout cadence may come from Net::Server or normal idle daemon behavior, not from Munin application logic. Treating it as a bug now risks replacing expected blocking behavior with an unnecessary workaround.
## Validation
Before any future patch, try the project-level entrypoint from the workspace root: `make`. There is no `make check` target in the inspected `Makefile`; the available project test target is `make test`.
For bounded independent reproduction, run a short foreground `munin-node` smoke under syscall tracing from a clean checkout after `make`, using the script entrypoint rather than Perl runtime internals, for example: `timeout 8s strace -ttT -f -e trace=pselect6,select,poll,ppoll,nanosleep,clock_nanosleep perl -Ilib -T script/munin-node --foreground --config t/config/munin-node.conf --servicedir plugins/node.d.debug --sconfdir t/config/plugin-conf.d`. Only claim reproduction if that command shows high-frequency nonblocking poll/select returns or measurable CPU churn tied to Munin. Otherwise validate the diagnosis with `perl -Ilib -c lib/Munin/Node/Server.pm` and report no patch.
## Patch Pass
Subject: Report inconclusive munin-node poll-loop evidence
## Commit Message
No source patch is included. Fixer observed `munin-node` under Perl in repeated `pselect6` samples, but the retained `/proc`, perf, and strace data point to a sleeping process in a timed select wait, not a locally reproduced CPU spin.
## Evidence Confidence
inferred
## Issue Connection
The collected signal is `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` sampled around `select()`/`pselect6`, with `wchan` at `poll_schedule_timeout` and strace lines returning after about 1.8-2.0 seconds. The likely root cause is normal idle or timer-driven waiting in the `munin-node` server loop, not a proven tight busy-poll loop.
I inspected the Perl entrypoint (`script/munin-node`) before considering the runtime, as well as `lib/Munin/Node/Server.pm` and `Munin::Common::Timeout::do_with_timeout`. The relevant local helpers are `_net_read`, `_net_write`, `do_with_timeout`, `Munin::Common::Logger`, and the Net::Server hook structure. Munin’s contribution docs require strict/warnings Perl style and taint-aware invocation.
Following the saved plan, I did not make a source change. Any plausible patch here would alter daemon timing/throttling behavior without reproduced evidence or a Perl-level stack tying the observed wait to faulty Munin logic. The expected effect of this no-patch diagnosis is to avoid an upstream patch that changes connection timing based on an inconclusive profiler signal.
## Git Add Paths
None
## Validation
Project-level validation attempted from the workspace root:
`make`
Failed before building Munin code because `Module::Build` is missing:
`Can't locate Module/Build.pm in @INC ... at Build.PL line 80.`
`make: *** [Makefile:149: Build] Error 2`
There is no `make check` target in the inspected `Makefile`.
Focused checks run:
`perl -Ilib -c lib/Munin/Node/Server.pm` passed: syntax OK.
`perl -T -Ilib -c script/munin-node` passed: syntax OK.
Independent reproduction attempt:
`timeout 8s strace -ttT -f -e trace=pselect6,select,poll,ppoll,nanosleep,clock_nanosleep perl -Ilib -T script/munin-node ...`
Blocked by sandbox ptrace restrictions: `PTRACE_TRACEME: Operation not permitted` and `ptrace(PTRACE_SEIZE, 5): Operation not permitted`.
Fallback foreground smoke with absolute paths exited with status `1` and no stdout/stderr, so it did not reproduce a long-running poll loop or CPU churn.
## Review Pass 1
RESULT: ok
No source changes are present in the workspace, so there is no code diff to reject. The no-patch diagnosis is consistent with the evidence limits: the bundle is profiler/strace-driven, the process was sleeping in `poll_schedule_timeout`, and no local reproduction tied the signal to faulty Munin code.
The author checked contribution docs and named relevant Munin helpers (`do_with_timeout`, `_net_read`, `_net_write`, logging, Net::Server hooks). Validation attempted the project-level `make` first, reported the `Module::Build` blocker, then ran focused syntax checks and documented the ptrace blocker for the independent strace reproduction.perl likely remains stuck in a busy-poll loop. A diagnosis report and patch proposal were created locally.
## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.
## Patch Pass
You are working on a bounded fixer proposal.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Produce the smallest reasonable patch for the target repository, keep the change upstreamable, prefer the clearest control flow available, and do not keep avoidable `goto` when a simpler structure would read better. Before introducing new file, process, allocation, locking, networking, or platform APIs, inspect nearby code and project contribution docs for existing helpers or compatibility wrappers and use those local patterns unless you can explain why they do not fit. Validate from a reproducible workspace-root entrypoint before falling back to focused leaf commands; if a build or test cannot run, report the exact command, the exact blocker, and any narrower check you ran instead. During validation, also try one bounded independent reproduction of the collected failure signal when it is safe and cheap, such as a failing test, smoke command, perf/strace comparison, or before/after runtime check. Only use `reproduced` if that command or test actually reproduced the failure; otherwise keep `observed` and report the reproduction blocker. The final explanation must connect the observed issue evidence to the actual code change, not just paraphrase the diff. Write like a maintainer is going to read the patch mail cold: explain the bug in plain language, define subsystem-specific jargon the first time you need it, and make the causal story obvious. Explicitly classify evidence confidence as `reproduced`, `observed`, or `inferred`: `reproduced` means you reproduced the failure locally; `observed` means Fixer has direct crash/log/trace evidence but you did not independently reproduce it; `inferred` means the source patch is not pull-request-ready, so do not leave a source diff unless you first gather stronger observed/reproduced evidence; otherwise return a no-patch diagnosis/report. For any source-changing `observed` patch, say explicitly in `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. Security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior need reproduced evidence plus explicit security-impact analysis before leaving a source diff; otherwise return a no-patch diagnosis/report for human review. If you introduce non-obvious state translation, index remapping, or backend split logic, add a short source comment that explains the invariant being preserved.
Start by explaining the likely root cause from the collected perf, strace, and /proc evidence. If you cannot land a safe patch, leave a diagnosis that is strong enough for an upstream bug report.
Interpreter process expectation: when the hot process is Python, Perl, shell, Node, Ruby, PHP, Lua, or another interpreter, inspect both the runtime and the script/application entrypoint from `details.interpreter_process`. Prefer the script or application package when evidence points there; do not patch the interpreter runtime merely because the hot binary is `python`, `perl`, `bash`, or similar. Runtime fixes are welcome only after checking the entrypoint and explaining why the runtime mishandles the workload or why running bad code faster/safer is itself the right upstream fix.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Keep the change narrowly scoped and summarize validation clearly.
In every authoring pass, your final response must start with `Subject: <single-line git commit subject>` and then include these markdown sections exactly:
## Commit Message
A short upstream-friendly explanation of what changed and why. Write it in plain language that a maintainer can follow without local complaint context. If you use subsystem jargon, define it immediately.
## Evidence Confidence
Exactly one word: `reproduced`, `observed`, or `inferred`. Use `reproduced` only when you reproduced the failure locally with a command or test, and include that command/test in `## Validation`. Use `observed` when Fixer has direct crash/log/trace evidence but you did not independently reproduce it. If `## Git Add Paths` lists source files for an `observed` patch, `## Issue Connection` must explicitly say the failure was observed by Fixer and not independently reproduced. Security-sensitive source changes touching authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior require reproduced evidence and explicit security-impact analysis; otherwise list `None` under `## Git Add Paths` and write a no-patch diagnosis/report. Use `inferred` for profiler/strace/indirect evidence; inferred responses may be no-patch diagnoses or reports, but inferred source patches are not pull-request-ready until stronger evidence is gathered.
## Issue Connection
Write this as maintainer-facing patch mail, not as local Fixer notes. Cover four things explicitly in readable sentences: the user-visible symptom or the exact collected signal, the code-level cause or the cautious inference from evidence, the specific change you made, and the expected effect. Do not invent a reproducer, command line, crash, or user-visible failure that is not present in the evidence bundle. If the evidence is direct-but-not-reproduced, say it was observed by Fixer and not independently reproduced. If the evidence is indirect and you did not gather stronger evidence, do not leave a source diff; write a no-patch diagnosis/report instead. Include an explicit effect sentence such as `The expected effect is ...`, `This should reduce ...`, or `This prevents ...` for source patches. If the logic is non-obvious in code, mention that you added a short explanatory comment.
## Git Add Paths
List the repo-relative paths that belong in the final patch, one per line. Use `None` only when you intentionally made no source changes. Include intentionally new files, and do not list generated build artifacts.
## Validation
List the checks you ran, or say clearly that you could not run them. Include the independent reproduction command/test and result when `## Evidence Confidence` is `reproduced`; if reproduction was attempted but blocked, name the exact blocker and keep confidence at `observed` or `inferred`.
Before editing, read the plan at `./plan-output.txt` and follow it unless the code proves part of it wrong. If you change course, say so explicitly in the final write-up instead of silently drifting from the plan.
## Review Pass 1
You are reviewing a freshly generated fixer patch.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Review the first patch pass. The original pre-edit snapshot is available at `./source` for diffing.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout. The latest author response is at `./patch-output.txt`. Inspect the current code and changed paths like a strict code reviewer. Focus on correctness, regressions, maintainability, awkward control flow such as avoidable `goto`, missing validation, weak or non-gittable commit message text, and explanations that fail to connect the observed issue evidence to the code change. Also review the maintainer experience: the patch mail should be easy to accept upstream, the user-visible bug should be explained in plain language, subsystem-specific jargon should be defined when first used, and any non-obvious state translation or index remapping in code should have a short explanatory comment. Reject patches that omit `## Evidence Confidence`, use anything other than `reproduced`, `observed`, or `inferred`, or sound more certain than that evidence level allows. Reject patches that claim `reproduced` unless `## Validation` names the concrete reproduction command or test and its result. Reject source patches in security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior unless the author reproduced the behavior and explicitly analyzed the security impact of the change; observed-only evidence should become a diagnosis/report, not a PR-ready source diff. Reject patches that invent a reproducer, command line, crash, or user-visible failure not present in the evidence bundle; indirect profiler or strace evidence may justify a cautious mitigation, but the author must say it is indirect instead of presenting it as a confirmed upstream bug. Reject patches that introduce generic libc/std APIs when nearby code or project docs provide a local compat/helper API for the same job, unless the author explicitly justifies the exception. Reject validation that only reports a leaf object/syntax build when a project-level configure/build/test entrypoint exists and was not attempted; if a full build cannot run, the author must show the exact failed command and blocker.
Do not apply code changes in this pass.
Return a short markdown review report. The first non-empty line must be exactly one of:
RESULT: ok
RESULT: fix-needed
If you choose `RESULT: fix-needed`, add a `## Findings` section with concrete, actionable items.## Plan Pass
## Problem
Fixer observed `/usr/sbin/munin-node --foreground` running under Perl with repeated `pselect6` samples. The retained evidence does not include a Perl-level stack or script line, and the strace excerpt shows blocking timeouts of about 1.8-2.0 seconds with process state `S (sleeping)`, not a proven tight spin.
## Evidence Confidence
inferred
## Proposed Subject
No source patch yet: report/diagnose the munin-node idle `select()` signal and collect stronger application-level evidence before editing.
## Patch Plan
Do not patch Munin in this pass. The evidence points at the `munin-node` entrypoint and `Munin::Node::Server`, which subclasses `Net::Server::Fork`; an idle daemon waiting in `select()` is expected server-loop behavior unless we can show near-zero timeout wakeups or CPU burn tied to Munin code.
If a later reproduction shows real busy wakeups, inspect `Munin::Node::Server->run`, Net::Server configuration passed from `script/munin-node`, and plugin child handling through `Munin::Node::Service->fork_service` and `Munin::Node::OS->run_as_child`. Follow local conventions from `CONTRIBUTING.md`/`HACKING.pod`: taint-mode-compatible Perl, `use strict; use warnings;`, file-local indentation style, no avoidable `goto`, and existing helpers such as `Munin::Common::Timeout`, `Munin::Common::Daemon::emit_sd_notify_message`, `Munin::Node::OS`, and `Munin::Common::Logger`.
No prior Fixer patch is present in this workspace, and the existing Debian patches are unrelated.
## Risks
Patching based only on the current profile could turn normal idle accept-loop behavior into a regression. The sampled CPU was low (`max_cpu_percent` 0.9), and the captured `pselect6` calls blocked for seconds, so a mitigation patch would be speculative without additional evidence.
## Validation
Before any future source edit, try the project-level entrypoint from the workspace root: `make`, then `make check` only if that target exists. This project exposes `make test` via `./Build test`, while `make check` is not defined in the inspected `Makefile`.
For bounded independent reproduction, run `munin-node --foreground` with a minimal temporary config/service directory and trace it briefly with `strace -ttT -f -e trace=pselect6,select,poll,ppoll,epoll_wait,nanosleep,clock_nanosleep`. A patch should only proceed if this captures repeated nonblocking or near-zero-timeout wakeups with meaningful CPU use, ideally with a Perl-level stack tying the loop to `Munin::Node::Server` or related Munin code.
## Patch Pass
Subject: No patch: diagnose munin-node select profile
## Commit Message
No source change is left for this proposal. The collected signal shows `munin-node` under Perl sleeping in `pselect6`, but the retained trace does not tie the wait loop to a Munin source line or show a nonblocking spin. A source patch would be speculative without a reproducible busy wakeup or a Perl-level stack.
## Evidence Confidence
inferred
## Issue Connection
Fixer collected a perf/strace signal from `/usr/bin/perl -wT /usr/sbin/munin-node --foreground`: native frames reached `select()`, the dominant syscall was `pselect6`, and `/proc` reported the process as `S (sleeping)`. The strace excerpt shows `pselect6` timing out after about 1.8-2.0 seconds, while the sampled process CPU was only 0.9%.
The cautious code-level inference is that this is likely the `munin-node` daemon’s normal idle server loop, not a confirmed runaway loop. The application entrypoint `script/munin-node` delegates serving to `Munin::Node::Server`, which subclasses `Net::Server::Fork`; plugin execution uses local helpers `Munin::Common::Timeout` and `Munin::Node::OS->run_as_child`. I also checked the Perl runtime only as the second target: the native backtrace contains Perl runtime frames, but no evidence shows Perl mishandling this workload.
I made no source change. This follows the saved plan rather than drifting from it: the evidence is profiler/syscall-level only, and the local reproduction attempts could not establish a busy loop. The expected effect of this no-patch disposition is to avoid landing an upstream change for behavior that currently looks like normal blocking accept-loop activity.
## Git Add Paths
None
## Validation
`make` from the workspace root failed before building because `Module::Build` is missing:
`Can't locate Module/Build.pm in @INC ... at Build.PL line 80.`
`make -n check` failed because there is no `check` target:
`make: *** No rule to make target 'check'. Stop.`
Narrow checks run after the build blocker:
`perl -c lib/Munin/Common/Timeout.pm && perl -c lib/Munin/Node/OS.pm && perl -c lib/Munin/Node/Service.pm && perl -c lib/Munin/Node/Server.pm`
All reported syntax OK, with existing `Munin::Node::OS.pm` redefinition warnings during compilation.
Independent reproduction attempt:
`timeout 6 strace -ttT -f -e trace=pselect6,select,poll,ppoll,epoll_wait,nanosleep,clock_nanosleep /usr/bin/munin-node --foreground`
Blocked by ptrace restrictions: `PTRACE_TRACEME: Operation not permitted`.
Fallback smoke attempt with a temporary config also could not reproduce the signal because the sandbox denied binding a TCP port:
`Cannot bind and listen to TCP port 4959 on 127.0.0.1 [Operation not permitted]`.
## Review Pass 1
RESULT: ok
No source diff is present against the original snapshot, and `Git Add Paths` correctly lists `None`.
The author’s no-patch diagnosis is consistent with the evidence level: the bundle contains indirect profiler/syscall evidence, low sampled CPU, sleeping process state, and `pselect6` calls that block for about two seconds. The response does not overclaim reproduction, uses `inferred`, and explains why a source patch would be speculative.
Validation is acceptable for a no-patch pass: `make` was attempted and the missing `Module::Build` blocker is reported, `make check` was checked and found absent, focused Perl syntax checks were run, and the independent strace/smoke reproduction blockers are stated clearly.perl likely remains stuck in a busy-poll loop. A diagnosis report and patch proposal were created locally.
## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.
## Patch Pass
You are working on a bounded fixer proposal.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Produce the smallest reasonable patch for the target repository, keep the change upstreamable, prefer the clearest control flow available, and do not keep avoidable `goto` when a simpler structure would read better. Before introducing new file, process, allocation, locking, networking, or platform APIs, inspect nearby code and project contribution docs for existing helpers or compatibility wrappers and use those local patterns unless you can explain why they do not fit. Validate from a reproducible workspace-root entrypoint before falling back to focused leaf commands; if a build or test cannot run, report the exact command, the exact blocker, and any narrower check you ran instead. During validation, also try one bounded independent reproduction of the collected failure signal when it is safe and cheap, such as a failing test, smoke command, perf/strace comparison, or before/after runtime check. Only use `reproduced` if that command or test actually reproduced the failure; otherwise keep `observed` and report the reproduction blocker. The final explanation must connect the observed issue evidence to the actual code change, not just paraphrase the diff. Write like a maintainer is going to read the patch mail cold: explain the bug in plain language, define subsystem-specific jargon the first time you need it, and make the causal story obvious. Explicitly classify evidence confidence as `reproduced`, `observed`, or `inferred`: `reproduced` means you reproduced the failure locally; `observed` means Fixer has direct crash/log/trace evidence but you did not independently reproduce it; `inferred` means the source patch is not pull-request-ready, so do not leave a source diff unless you first gather stronger observed/reproduced evidence; otherwise return a no-patch diagnosis/report. For any source-changing `observed` patch, say explicitly in `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. Security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior need reproduced evidence plus explicit security-impact analysis before leaving a source diff; otherwise return a no-patch diagnosis/report for human review. If you introduce non-obvious state translation, index remapping, or backend split logic, add a short source comment that explains the invariant being preserved.
Start by explaining the likely root cause from the collected perf, strace, and /proc evidence. If you cannot land a safe patch, leave a diagnosis that is strong enough for an upstream bug report.
Interpreter process expectation: when the hot process is Python, Perl, shell, Node, Ruby, PHP, Lua, or another interpreter, inspect both the runtime and the script/application entrypoint from `details.interpreter_process`. Prefer the script or application package when evidence points there; do not patch the interpreter runtime merely because the hot binary is `python`, `perl`, `bash`, or similar. Runtime fixes are welcome only after checking the entrypoint and explaining why the runtime mishandles the workload or why running bad code faster/safer is itself the right upstream fix.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Keep the change narrowly scoped and summarize validation clearly.
In every authoring pass, your final response must start with `Subject: <single-line git commit subject>` and then include these markdown sections exactly:
## Commit Message
A short upstream-friendly explanation of what changed and why. Write it in plain language that a maintainer can follow without local complaint context. If you use subsystem jargon, define it immediately.
## Evidence Confidence
Exactly one word: `reproduced`, `observed`, or `inferred`. Use `reproduced` only when you reproduced the failure locally with a command or test, and include that command/test in `## Validation`. Use `observed` when Fixer has direct crash/log/trace evidence but you did not independently reproduce it. If `## Git Add Paths` lists source files for an `observed` patch, `## Issue Connection` must explicitly say the failure was observed by Fixer and not independently reproduced. Security-sensitive source changes touching authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior require reproduced evidence and explicit security-impact analysis; otherwise list `None` under `## Git Add Paths` and write a no-patch diagnosis/report. Use `inferred` for profiler/strace/indirect evidence; inferred responses may be no-patch diagnoses or reports, but inferred source patches are not pull-request-ready until stronger evidence is gathered.
## Issue Connection
Write this as maintainer-facing patch mail, not as local Fixer notes. Cover four things explicitly in readable sentences: the user-visible symptom or the exact collected signal, the code-level cause or the cautious inference from evidence, the specific change you made, and the expected effect. Do not invent a reproducer, command line, crash, or user-visible failure that is not present in the evidence bundle. If the evidence is direct-but-not-reproduced, say it was observed by Fixer and not independently reproduced. If the evidence is indirect and you did not gather stronger evidence, do not leave a source diff; write a no-patch diagnosis/report instead. Include an explicit effect sentence such as `The expected effect is ...`, `This should reduce ...`, or `This prevents ...` for source patches. If the logic is non-obvious in code, mention that you added a short explanatory comment.
## Git Add Paths
List the repo-relative paths that belong in the final patch, one per line. Use `None` only when you intentionally made no source changes. Include intentionally new files, and do not list generated build artifacts.
## Validation
List the checks you ran, or say clearly that you could not run them. Include the independent reproduction command/test and result when `## Evidence Confidence` is `reproduced`; if reproduction was attempted but blocked, name the exact blocker and keep confidence at `observed` or `inferred`.
Before editing, read the plan at `./plan-output.txt` and follow it unless the code proves part of it wrong. If you change course, say so explicitly in the final write-up instead of silently drifting from the plan.
## Review Pass 1
You are reviewing a freshly generated fixer patch.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Review the first patch pass. The original pre-edit snapshot is available at `./source` for diffing.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout. The latest author response is at `./patch-output.txt`. Inspect the current code and changed paths like a strict code reviewer. Focus on correctness, regressions, maintainability, awkward control flow such as avoidable `goto`, missing validation, weak or non-gittable commit message text, and explanations that fail to connect the observed issue evidence to the code change. Also review the maintainer experience: the patch mail should be easy to accept upstream, the user-visible bug should be explained in plain language, subsystem-specific jargon should be defined when first used, and any non-obvious state translation or index remapping in code should have a short explanatory comment. Reject patches that omit `## Evidence Confidence`, use anything other than `reproduced`, `observed`, or `inferred`, or sound more certain than that evidence level allows. Reject patches that claim `reproduced` unless `## Validation` names the concrete reproduction command or test and its result. Reject source patches in security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior unless the author reproduced the behavior and explicitly analyzed the security impact of the change; observed-only evidence should become a diagnosis/report, not a PR-ready source diff. Reject patches that invent a reproducer, command line, crash, or user-visible failure not present in the evidence bundle; indirect profiler or strace evidence may justify a cautious mitigation, but the author must say it is indirect instead of presenting it as a confirmed upstream bug. Reject patches that introduce generic libc/std APIs when nearby code or project docs provide a local compat/helper API for the same job, unless the author explicitly justifies the exception. Reject validation that only reports a leaf object/syntax build when a project-level configure/build/test entrypoint exists and was not attempted; if a full build cannot run, the author must show the exact failed command and blocker.
Do not apply code changes in this pass.
Return a short markdown review report. The first non-empty line must be exactly one of:
RESULT: ok
RESULT: fix-needed
If you choose `RESULT: fix-needed`, add a `## Findings` section with concrete, actionable items.## Plan Pass
## Problem
Fixer observed `/usr/sbin/munin-node --foreground` running under Perl with repeated `pselect6` samples. The retained evidence does not include a Perl-level stack or script line, and the strace excerpt shows blocking timeouts of about 1.8-2.0 seconds with process state `S (sleeping)`, not a proven tight spin.
## Evidence Confidence
inferred
## Proposed Subject
No source patch yet: report/diagnose the munin-node idle `select()` signal and collect stronger application-level evidence before editing.
## Patch Plan
Do not patch Munin in this pass. The evidence points at the `munin-node` entrypoint and `Munin::Node::Server`, which subclasses `Net::Server::Fork`; an idle daemon waiting in `select()` is expected server-loop behavior unless we can show near-zero timeout wakeups or CPU burn tied to Munin code.
If a later reproduction shows real busy wakeups, inspect `Munin::Node::Server->run`, Net::Server configuration passed from `script/munin-node`, and plugin child handling through `Munin::Node::Service->fork_service` and `Munin::Node::OS->run_as_child`. Follow local conventions from `CONTRIBUTING.md`/`HACKING.pod`: taint-mode-compatible Perl, `use strict; use warnings;`, file-local indentation style, no avoidable `goto`, and existing helpers such as `Munin::Common::Timeout`, `Munin::Common::Daemon::emit_sd_notify_message`, `Munin::Node::OS`, and `Munin::Common::Logger`.
No prior Fixer patch is present in this workspace, and the existing Debian patches are unrelated.
## Risks
Patching based only on the current profile could turn normal idle accept-loop behavior into a regression. The sampled CPU was low (`max_cpu_percent` 0.9), and the captured `pselect6` calls blocked for seconds, so a mitigation patch would be speculative without additional evidence.
## Validation
Before any future source edit, try the project-level entrypoint from the workspace root: `make`, then `make check` only if that target exists. This project exposes `make test` via `./Build test`, while `make check` is not defined in the inspected `Makefile`.
For bounded independent reproduction, run `munin-node --foreground` with a minimal temporary config/service directory and trace it briefly with `strace -ttT -f -e trace=pselect6,select,poll,ppoll,epoll_wait,nanosleep,clock_nanosleep`. A patch should only proceed if this captures repeated nonblocking or near-zero-timeout wakeups with meaningful CPU use, ideally with a Perl-level stack tying the loop to `Munin::Node::Server` or related Munin code.
## Patch Pass
Subject: No patch: diagnose munin-node select profile
## Commit Message
No source change is left for this proposal. The collected signal shows `munin-node` under Perl sleeping in `pselect6`, but the retained trace does not tie the wait loop to a Munin source line or show a nonblocking spin. A source patch would be speculative without a reproducible busy wakeup or a Perl-level stack.
## Evidence Confidence
inferred
## Issue Connection
Fixer collected a perf/strace signal from `/usr/bin/perl -wT /usr/sbin/munin-node --foreground`: native frames reached `select()`, the dominant syscall was `pselect6`, and `/proc` reported the process as `S (sleeping)`. The strace excerpt shows `pselect6` timing out after about 1.8-2.0 seconds, while the sampled process CPU was only 0.9%.
The cautious code-level inference is that this is likely the `munin-node` daemon’s normal idle server loop, not a confirmed runaway loop. The application entrypoint `script/munin-node` delegates serving to `Munin::Node::Server`, which subclasses `Net::Server::Fork`; plugin execution uses local helpers `Munin::Common::Timeout` and `Munin::Node::OS->run_as_child`. I also checked the Perl runtime only as the second target: the native backtrace contains Perl runtime frames, but no evidence shows Perl mishandling this workload.
I made no source change. This follows the saved plan rather than drifting from it: the evidence is profiler/syscall-level only, and the local reproduction attempts could not establish a busy loop. The expected effect of this no-patch disposition is to avoid landing an upstream change for behavior that currently looks like normal blocking accept-loop activity.
## Git Add Paths
None
## Validation
`make` from the workspace root failed before building because `Module::Build` is missing:
`Can't locate Module/Build.pm in @INC ... at Build.PL line 80.`
`make -n check` failed because there is no `check` target:
`make: *** No rule to make target 'check'. Stop.`
Narrow checks run after the build blocker:
`perl -c lib/Munin/Common/Timeout.pm && perl -c lib/Munin/Node/OS.pm && perl -c lib/Munin/Node/Service.pm && perl -c lib/Munin/Node/Server.pm`
All reported syntax OK, with existing `Munin::Node::OS.pm` redefinition warnings during compilation.
Independent reproduction attempt:
`timeout 6 strace -ttT -f -e trace=pselect6,select,poll,ppoll,epoll_wait,nanosleep,clock_nanosleep /usr/bin/munin-node --foreground`
Blocked by ptrace restrictions: `PTRACE_TRACEME: Operation not permitted`.
Fallback smoke attempt with a temporary config also could not reproduce the signal because the sandbox denied binding a TCP port:
`Cannot bind and listen to TCP port 4959 on 127.0.0.1 [Operation not permitted]`.
## Review Pass 1
RESULT: ok
No source diff is present against the original snapshot, and `Git Add Paths` correctly lists `None`.
The author’s no-patch diagnosis is consistent with the evidence level: the bundle contains indirect profiler/syscall evidence, low sampled CPU, sleeping process state, and `pselect6` calls that block for about two seconds. The response does not overclaim reproduction, uses `inferred`, and explains why a source patch would be speculative.
Validation is acceptable for a no-patch pass: `make` was attempted and the missing `Module::Build` blocker is reported, `make check` was checked and found absent, focused Perl syntax checks were run, and the independent strace/smoke reproduction blockers are stated clearly.perl likely remains stuck in a busy-poll loop. A diagnosis report and patch proposal were created locally.
## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.
## Patch Pass
You are working on a bounded fixer proposal.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Produce the smallest reasonable patch for the target repository, keep the change upstreamable, prefer the clearest control flow available, and do not keep avoidable `goto` when a simpler structure would read better. Before introducing new file, process, allocation, locking, networking, or platform APIs, inspect nearby code and project contribution docs for existing helpers or compatibility wrappers and use those local patterns unless you can explain why they do not fit. Validate from a reproducible workspace-root entrypoint before falling back to focused leaf commands; if a build or test cannot run, report the exact command, the exact blocker, and any narrower check you ran instead. During validation, also try one bounded independent reproduction of the collected failure signal when it is safe and cheap, such as a failing test, smoke command, perf/strace comparison, or before/after runtime check. Only use `reproduced` if that command or test actually reproduced the failure; otherwise keep `observed` and report the reproduction blocker. The final explanation must connect the observed issue evidence to the actual code change, not just paraphrase the diff. Write like a maintainer is going to read the patch mail cold: explain the bug in plain language, define subsystem-specific jargon the first time you need it, and make the causal story obvious. Explicitly classify evidence confidence as `reproduced`, `observed`, or `inferred`: `reproduced` means you reproduced the failure locally; `observed` means Fixer has direct crash/log/trace evidence but you did not independently reproduce it; `inferred` means the source patch is not pull-request-ready, so do not leave a source diff unless you first gather stronger observed/reproduced evidence; otherwise return a no-patch diagnosis/report. For any source-changing `observed` patch, say explicitly in `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. Security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior need reproduced evidence plus explicit security-impact analysis before leaving a source diff; otherwise return a no-patch diagnosis/report for human review. If you introduce non-obvious state translation, index remapping, or backend split logic, add a short source comment that explains the invariant being preserved.
Start by explaining the likely root cause from the collected perf, strace, and /proc evidence. If you cannot land a safe patch, leave a diagnosis that is strong enough for an upstream bug report.
Interpreter process expectation: when the hot process is Python, Perl, shell, Node, Ruby, PHP, Lua, or another interpreter, inspect both the runtime and the script/application entrypoint from `details.interpreter_process`. Prefer the script or application package when evidence points there; do not patch the interpreter runtime merely because the hot binary is `python`, `perl`, `bash`, or similar. Runtime fixes are welcome only after checking the entrypoint and explaining why the runtime mishandles the workload or why running bad code faster/safer is itself the right upstream fix.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Keep the change narrowly scoped and summarize validation clearly.
In every authoring pass, your final response must start with `Subject: <single-line git commit subject>` and then include these markdown sections exactly:
## Commit Message
A short upstream-friendly explanation of what changed and why. Write it in plain language that a maintainer can follow without local complaint context. If you use subsystem jargon, define it immediately.
## Evidence Confidence
Exactly one word: `reproduced`, `observed`, or `inferred`. Use `reproduced` only when you reproduced the failure locally with a command or test, and include that command/test in `## Validation`. Use `observed` when Fixer has direct crash/log/trace evidence but you did not independently reproduce it. If `## Git Add Paths` lists source files for an `observed` patch, `## Issue Connection` must explicitly say the failure was observed by Fixer and not independently reproduced. Security-sensitive source changes touching authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior require reproduced evidence and explicit security-impact analysis; otherwise list `None` under `## Git Add Paths` and write a no-patch diagnosis/report. Use `inferred` for profiler/strace/indirect evidence; inferred responses may be no-patch diagnoses or reports, but inferred source patches are not pull-request-ready until stronger evidence is gathered.
## Issue Connection
Write this as maintainer-facing patch mail, not as local Fixer notes. Cover four things explicitly in readable sentences: the user-visible symptom or the exact collected signal, the code-level cause or the cautious inference from evidence, the specific change you made, and the expected effect. Do not invent a reproducer, command line, crash, or user-visible failure that is not present in the evidence bundle. If the evidence is direct-but-not-reproduced, say it was observed by Fixer and not independently reproduced. If the evidence is indirect and you did not gather stronger evidence, do not leave a source diff; write a no-patch diagnosis/report instead. Include an explicit effect sentence such as `The expected effect is ...`, `This should reduce ...`, or `This prevents ...` for source patches. If the logic is non-obvious in code, mention that you added a short explanatory comment.
## Git Add Paths
List the repo-relative paths that belong in the final patch, one per line. Use `None` only when you intentionally made no source changes. Include intentionally new files, and do not list generated build artifacts.
## Validation
List the checks you ran, or say clearly that you could not run them. Include the independent reproduction command/test and result when `## Evidence Confidence` is `reproduced`; if reproduction was attempted but blocked, name the exact blocker and keep confidence at `observed` or `inferred`.
Before editing, read the plan at `./plan-output.txt` and follow it unless the code proves part of it wrong. If you change course, say so explicitly in the final write-up instead of silently drifting from the plan.
## Review Pass 1
You are reviewing a freshly generated fixer patch.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Review the first patch pass. The original pre-edit snapshot is available at `./source` for diffing.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout. The latest author response is at `./patch-output.txt`. Inspect the current code and changed paths like a strict code reviewer. Focus on correctness, regressions, maintainability, awkward control flow such as avoidable `goto`, missing validation, weak or non-gittable commit message text, and explanations that fail to connect the observed issue evidence to the code change. Also review the maintainer experience: the patch mail should be easy to accept upstream, the user-visible bug should be explained in plain language, subsystem-specific jargon should be defined when first used, and any non-obvious state translation or index remapping in code should have a short explanatory comment. Reject patches that omit `## Evidence Confidence`, use anything other than `reproduced`, `observed`, or `inferred`, or sound more certain than that evidence level allows. Reject patches that claim `reproduced` unless `## Validation` names the concrete reproduction command or test and its result. Reject source patches in security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior unless the author reproduced the behavior and explicitly analyzed the security impact of the change; observed-only evidence should become a diagnosis/report, not a PR-ready source diff. Reject patches that invent a reproducer, command line, crash, or user-visible failure not present in the evidence bundle; indirect profiler or strace evidence may justify a cautious mitigation, but the author must say it is indirect instead of presenting it as a confirmed upstream bug. Reject patches that introduce generic libc/std APIs when nearby code or project docs provide a local compat/helper API for the same job, unless the author explicitly justifies the exception. Reject validation that only reports a leaf object/syntax build when a project-level configure/build/test entrypoint exists and was not attempted; if a full build cannot run, the author must show the exact failed command and blocker.
Do not apply code changes in this pass.
Return a short markdown review report. The first non-empty line must be exactly one of:
RESULT: ok
RESULT: fix-needed
If you choose `RESULT: fix-needed`, add a `## Findings` section with concrete, actionable items.## Plan Pass
## Problem
Fixer observed `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` in `pselect6`, but the retained strace shows blocking waits of about 1.8s and 2.0s, process state `S (sleeping)`, and only 0.9% CPU. The evidence does not include a Perl-level stack or a script-line tie to `munin-node`, so a source change would be speculative.
## Evidence Confidence
inferred
## Proposed Subject
No source patch yet: diagnose whether `munin-node` is actually busy-polling before changing upstream code.
## Patch Plan
Do not edit files in this pass. Inspecting `script/munin-node` and `lib/Munin/Node/Server.pm` shows the entrypoint delegates to `Net::Server::Fork`, with request handling bounded by the local `Munin::Common::Timeout::do_with_timeout` helper. The only relevant local daemon helper found is `Munin::Common::Daemon::emit_sd_notify_message`; plugin process IO uses `Munin::Node::OS->run_as_child`.
The collected evidence looks more like a normally sleeping `select` loop than a runaway loop, so the next patch step should first collect stronger evidence: a bounded local foreground `munin-node` run under strace, plus a Perl/module stack if it spins. If that shows rapid zero-timeout `select` or repeated immediate wakeups attributable to `Munin::Node::Server` or plugin child IO, then patch the smallest implicated path and prefer existing helpers over ad hoc timing or process-control code.
No prior Fixer source patch was present to improve or replace; the workspace only shows the baseline Debian source/patch state.
## Risks
A no-patch diagnosis may miss an intermittent production-only wakeup source, such as Net::Server configuration, socket readiness, TLS setup, or a plugin side effect. A speculative sleep/throttle patch would risk hiding real readiness bugs or changing daemon responsiveness without proving the issue.
## Validation
Before any focused check, try the project entrypoints from the workspace root: `make`, then `make check` if available. This tree exposes `make test` rather than `make check`, so if `make check` is absent or fails as “No rule to make target,” report that exact reason and run `make test`.
Bounded independent reproduction attempt: after build generation, start `script/munin-node --foreground` with a temporary minimal config and empty plugin dir under `timeout`, trace only `select`/`pselect6`, and verify whether waits block for nonzero durations or spin immediately. If no spin is reproduced, final reporting should state that Fixer observed the profile but local validation did not reproduce a busy poll.
## Patch Pass
Subject: No patch: munin-node select profile is inconclusive
## Commit Message
No source change was made. The collected signal points at an idle `select` wait in `munin-node`, but the retained `/proc` and strace details do not prove a busy loop in Munin or Perl.
The likely root cause is a profiler misclassification: the process was sleeping in `poll_schedule_timeout`, strace showed `pselect6` calls blocking for about two seconds, and CPU was only 0.9%. That is consistent with an idle `Net::Server::Fork` listener, not a tight application loop.
## Evidence Confidence
inferred
## Issue Connection
Fixer observed `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` with native frames under `select`/`pselect6`. The evidence also says the process state was `S (sleeping)`, the wait channel was `poll_schedule_timeout.constprop.0`, and the retained strace lines blocked for about 1.8s and 2.0s.
I inspected both sides of the interpreter report: the Perl runtime was `/usr/bin/perl` 5.40.1, but the application entrypoint is `script/munin-node`, which delegates the server loop to `Munin::Node::Server` and `Net::Server::Fork`. In the Munin code, request handling uses the existing `Munin::Common::Timeout::do_with_timeout` helper, daemon readiness uses `Munin::Common::Daemon::emit_sd_notify_message`, and plugin execution goes through `Munin::Node::OS->run_as_child`. I found no Munin-level polling loop matching the evidence.
Following `CONTRIBUTING.md` and `HACKING.pod`, I did not add a speculative sleep, throttle, or control-flow change. The evidence is profiler/strace based and lacks a Perl-level stack tying the sampled wait to a Munin source line. The expected effect of leaving no patch is to avoid an upstream change that would mask normal idle listener behavior without proving a Munin bug.
## Git Add Paths
None
## Validation
`make` failed before build generation because `Module::Build` is missing:
`Can't locate Module/Build.pm in @INC ... at Build.PL line 80`
`make: *** [Makefile:149: Build] Error 2`
`make check` failed because this tree has no check target:
`make: *** No rule to make target 'check'. Stop.`
Focused checks:
`perl -Ilib -c lib/Munin/Node/Server.pm` passed.
`perl -T -Ilib -c script/munin-node` passed.
Independent reproduction attempt:
`timeout 5s strace -ttT -f -e trace=pselect6,select,poll,ppoll,epoll_wait,nanosleep,clock_nanosleep ... script/munin-node --foreground ...` was blocked by sandbox ptrace restrictions:
`PTRACE_TRACEME: Operation not permitted`
`ptrace(PTRACE_SEIZE, 8): Operation not permitted`
A weaker foreground smoke run with `/usr/bin/time` and a temporary config also could not start the listener because the sandbox denied bind/listen:
`Cannot bind and listen to TCP port 14949 on 127.0.0.1 [Operation not permitted]`
Because the failure signal was not independently reproduced and the available evidence is indirect, no source diff is pull-request-ready.
## Review Pass 1
RESULT: ok
No source changes are present in the workspace, and the no-patch diagnosis is consistent with the evidence level. The author correctly kept `## Evidence Confidence` as `inferred`, listed `None` under `## Git Add Paths`, and did not leave a speculative source diff for profiler/strace-only evidence.
Validation is acceptable for a no-patch review: `make` and `make check` were attempted from the workspace root with exact blockers reported, followed by focused Perl syntax checks and a bounded reproduction attempt that was blocked by ptrace/network sandbox restrictions. The explanation also names the relevant Munin helpers and conventions inspected.perl likely remains stuck in a busy-poll loop. A diagnosis report and patch proposal were created locally.
## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.
## Patch Pass
You are working on a bounded fixer proposal.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Produce the smallest reasonable patch for the target repository, keep the change upstreamable, prefer the clearest control flow available, and do not keep avoidable `goto` when a simpler structure would read better. Before introducing new file, process, allocation, locking, networking, or platform APIs, inspect nearby code and project contribution docs for existing helpers or compatibility wrappers and use those local patterns unless you can explain why they do not fit. Validate from a reproducible workspace-root entrypoint before falling back to focused leaf commands; if a build or test cannot run, report the exact command, the exact blocker, and any narrower check you ran instead. During validation, also try one bounded independent reproduction of the collected failure signal when it is safe and cheap, such as a failing test, smoke command, perf/strace comparison, or before/after runtime check. Only use `reproduced` if that command or test actually reproduced the failure; otherwise keep `observed` and report the reproduction blocker. The final explanation must connect the observed issue evidence to the actual code change, not just paraphrase the diff. Write like a maintainer is going to read the patch mail cold: explain the bug in plain language, define subsystem-specific jargon the first time you need it, and make the causal story obvious. Explicitly classify evidence confidence as `reproduced`, `observed`, or `inferred`: `reproduced` means you reproduced the failure locally; `observed` means Fixer has direct crash/log/trace evidence but you did not independently reproduce it; `inferred` means the source patch is not pull-request-ready, so do not leave a source diff unless you first gather stronger observed/reproduced evidence; otherwise return a no-patch diagnosis/report. For any source-changing `observed` patch, say explicitly in `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. Security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior need reproduced evidence plus explicit security-impact analysis before leaving a source diff; otherwise return a no-patch diagnosis/report for human review. If you introduce non-obvious state translation, index remapping, or backend split logic, add a short source comment that explains the invariant being preserved.
Start by explaining the likely root cause from the collected perf, strace, and /proc evidence. If you cannot land a safe patch, leave a diagnosis that is strong enough for an upstream bug report.
Interpreter process expectation: when the hot process is Python, Perl, shell, Node, Ruby, PHP, Lua, or another interpreter, inspect both the runtime and the script/application entrypoint from `details.interpreter_process`. Prefer the script or application package when evidence points there; do not patch the interpreter runtime merely because the hot binary is `python`, `perl`, `bash`, or similar. Runtime fixes are welcome only after checking the entrypoint and explaining why the runtime mishandles the workload or why running bad code faster/safer is itself the right upstream fix.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Keep the change narrowly scoped and summarize validation clearly.
In every authoring pass, your final response must start with `Subject: <single-line git commit subject>` and then include these markdown sections exactly:
## Commit Message
A short upstream-friendly explanation of what changed and why. Write it in plain language that a maintainer can follow without local complaint context. If you use subsystem jargon, define it immediately.
## Evidence Confidence
Exactly one word: `reproduced`, `observed`, or `inferred`. Use `reproduced` only when you reproduced the failure locally with a command or test, and include that command/test in `## Validation`. Use `observed` when Fixer has direct crash/log/trace evidence but you did not independently reproduce it. If `## Git Add Paths` lists source files for an `observed` patch, `## Issue Connection` must explicitly say the failure was observed by Fixer and not independently reproduced. Security-sensitive source changes touching authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior require reproduced evidence and explicit security-impact analysis; otherwise list `None` under `## Git Add Paths` and write a no-patch diagnosis/report. Use `inferred` for profiler/strace/indirect evidence; inferred responses may be no-patch diagnoses or reports, but inferred source patches are not pull-request-ready until stronger evidence is gathered.
## Issue Connection
Write this as maintainer-facing patch mail, not as local Fixer notes. Cover four things explicitly in readable sentences: the user-visible symptom or the exact collected signal, the code-level cause or the cautious inference from evidence, the specific change you made, and the expected effect. Do not invent a reproducer, command line, crash, or user-visible failure that is not present in the evidence bundle. If the evidence is direct-but-not-reproduced, say it was observed by Fixer and not independently reproduced. If the evidence is indirect and you did not gather stronger evidence, do not leave a source diff; write a no-patch diagnosis/report instead. Include an explicit effect sentence such as `The expected effect is ...`, `This should reduce ...`, or `This prevents ...` for source patches. If the logic is non-obvious in code, mention that you added a short explanatory comment.
## Git Add Paths
List the repo-relative paths that belong in the final patch, one per line. Use `None` only when you intentionally made no source changes. Include intentionally new files, and do not list generated build artifacts.
## Validation
List the checks you ran, or say clearly that you could not run them. Include the independent reproduction command/test and result when `## Evidence Confidence` is `reproduced`; if reproduction was attempted but blocked, name the exact blocker and keep confidence at `observed` or `inferred`.
Before editing, read the plan at `./plan-output.txt` and follow it unless the code proves part of it wrong. If you change course, say so explicitly in the final write-up instead of silently drifting from the plan.
## Review Pass 1
You are reviewing a freshly generated fixer patch.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Review the first patch pass. The original pre-edit snapshot is available at `./source` for diffing.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout. The latest author response is at `./patch-output.txt`. Inspect the current code and changed paths like a strict code reviewer. Focus on correctness, regressions, maintainability, awkward control flow such as avoidable `goto`, missing validation, weak or non-gittable commit message text, and explanations that fail to connect the observed issue evidence to the code change. Also review the maintainer experience: the patch mail should be easy to accept upstream, the user-visible bug should be explained in plain language, subsystem-specific jargon should be defined when first used, and any non-obvious state translation or index remapping in code should have a short explanatory comment. Reject patches that omit `## Evidence Confidence`, use anything other than `reproduced`, `observed`, or `inferred`, or sound more certain than that evidence level allows. Reject patches that claim `reproduced` unless `## Validation` names the concrete reproduction command or test and its result. Reject source patches in security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior unless the author reproduced the behavior and explicitly analyzed the security impact of the change; observed-only evidence should become a diagnosis/report, not a PR-ready source diff. Reject patches that invent a reproducer, command line, crash, or user-visible failure not present in the evidence bundle; indirect profiler or strace evidence may justify a cautious mitigation, but the author must say it is indirect instead of presenting it as a confirmed upstream bug. Reject patches that introduce generic libc/std APIs when nearby code or project docs provide a local compat/helper API for the same job, unless the author explicitly justifies the exception. Reject validation that only reports a leaf object/syntax build when a project-level configure/build/test entrypoint exists and was not attempted; if a full build cannot run, the author must show the exact failed command and blocker.
Do not apply code changes in this pass.
Return a short markdown review report. The first non-empty line must be exactly one of:
RESULT: ok
RESULT: fix-needed
If you choose `RESULT: fix-needed`, add a `## Findings` section with concrete, actionable items.## Plan Pass
## Problem
Fixer observed `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` in `pselect6`, but the retained strace shows blocking waits of about 1.8s and 2.0s, process state `S (sleeping)`, and only 0.9% CPU. The evidence does not include a Perl-level stack or a script-line tie to `munin-node`, so a source change would be speculative.
## Evidence Confidence
inferred
## Proposed Subject
No source patch yet: diagnose whether `munin-node` is actually busy-polling before changing upstream code.
## Patch Plan
Do not edit files in this pass. Inspecting `script/munin-node` and `lib/Munin/Node/Server.pm` shows the entrypoint delegates to `Net::Server::Fork`, with request handling bounded by the local `Munin::Common::Timeout::do_with_timeout` helper. The only relevant local daemon helper found is `Munin::Common::Daemon::emit_sd_notify_message`; plugin process IO uses `Munin::Node::OS->run_as_child`.
The collected evidence looks more like a normally sleeping `select` loop than a runaway loop, so the next patch step should first collect stronger evidence: a bounded local foreground `munin-node` run under strace, plus a Perl/module stack if it spins. If that shows rapid zero-timeout `select` or repeated immediate wakeups attributable to `Munin::Node::Server` or plugin child IO, then patch the smallest implicated path and prefer existing helpers over ad hoc timing or process-control code.
No prior Fixer source patch was present to improve or replace; the workspace only shows the baseline Debian source/patch state.
## Risks
A no-patch diagnosis may miss an intermittent production-only wakeup source, such as Net::Server configuration, socket readiness, TLS setup, or a plugin side effect. A speculative sleep/throttle patch would risk hiding real readiness bugs or changing daemon responsiveness without proving the issue.
## Validation
Before any focused check, try the project entrypoints from the workspace root: `make`, then `make check` if available. This tree exposes `make test` rather than `make check`, so if `make check` is absent or fails as “No rule to make target,” report that exact reason and run `make test`.
Bounded independent reproduction attempt: after build generation, start `script/munin-node --foreground` with a temporary minimal config and empty plugin dir under `timeout`, trace only `select`/`pselect6`, and verify whether waits block for nonzero durations or spin immediately. If no spin is reproduced, final reporting should state that Fixer observed the profile but local validation did not reproduce a busy poll.
## Patch Pass
Subject: No patch: munin-node select profile is inconclusive
## Commit Message
No source change was made. The collected signal points at an idle `select` wait in `munin-node`, but the retained `/proc` and strace details do not prove a busy loop in Munin or Perl.
The likely root cause is a profiler misclassification: the process was sleeping in `poll_schedule_timeout`, strace showed `pselect6` calls blocking for about two seconds, and CPU was only 0.9%. That is consistent with an idle `Net::Server::Fork` listener, not a tight application loop.
## Evidence Confidence
inferred
## Issue Connection
Fixer observed `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` with native frames under `select`/`pselect6`. The evidence also says the process state was `S (sleeping)`, the wait channel was `poll_schedule_timeout.constprop.0`, and the retained strace lines blocked for about 1.8s and 2.0s.
I inspected both sides of the interpreter report: the Perl runtime was `/usr/bin/perl` 5.40.1, but the application entrypoint is `script/munin-node`, which delegates the server loop to `Munin::Node::Server` and `Net::Server::Fork`. In the Munin code, request handling uses the existing `Munin::Common::Timeout::do_with_timeout` helper, daemon readiness uses `Munin::Common::Daemon::emit_sd_notify_message`, and plugin execution goes through `Munin::Node::OS->run_as_child`. I found no Munin-level polling loop matching the evidence.
Following `CONTRIBUTING.md` and `HACKING.pod`, I did not add a speculative sleep, throttle, or control-flow change. The evidence is profiler/strace based and lacks a Perl-level stack tying the sampled wait to a Munin source line. The expected effect of leaving no patch is to avoid an upstream change that would mask normal idle listener behavior without proving a Munin bug.
## Git Add Paths
None
## Validation
`make` failed before build generation because `Module::Build` is missing:
`Can't locate Module/Build.pm in @INC ... at Build.PL line 80`
`make: *** [Makefile:149: Build] Error 2`
`make check` failed because this tree has no check target:
`make: *** No rule to make target 'check'. Stop.`
Focused checks:
`perl -Ilib -c lib/Munin/Node/Server.pm` passed.
`perl -T -Ilib -c script/munin-node` passed.
Independent reproduction attempt:
`timeout 5s strace -ttT -f -e trace=pselect6,select,poll,ppoll,epoll_wait,nanosleep,clock_nanosleep ... script/munin-node --foreground ...` was blocked by sandbox ptrace restrictions:
`PTRACE_TRACEME: Operation not permitted`
`ptrace(PTRACE_SEIZE, 8): Operation not permitted`
A weaker foreground smoke run with `/usr/bin/time` and a temporary config also could not start the listener because the sandbox denied bind/listen:
`Cannot bind and listen to TCP port 14949 on 127.0.0.1 [Operation not permitted]`
Because the failure signal was not independently reproduced and the available evidence is indirect, no source diff is pull-request-ready.
## Review Pass 1
RESULT: ok
No source changes are present in the workspace, and the no-patch diagnosis is consistent with the evidence level. The author correctly kept `## Evidence Confidence` as `inferred`, listed `None` under `## Git Add Paths`, and did not leave a speculative source diff for profiler/strace-only evidence.
Validation is acceptable for a no-patch review: `make` and `make check` were attempted from the workspace root with exact blockers reported, followed by focused Perl syntax checks and a bounded reproduction attempt that was blocked by ptrace/network sandbox restrictions. The explanation also names the relevant Munin helpers and conventions inspected.perl likely remains stuck in a busy-poll loop. A diagnosis report and patch proposal were created locally.
## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.
## Patch Pass
You are working on a bounded fixer proposal.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Produce the smallest reasonable patch for the target repository, keep the change upstreamable, prefer the clearest control flow available, and do not keep avoidable `goto` when a simpler structure would read better. Before introducing new file, process, allocation, locking, networking, or platform APIs, inspect nearby code and project contribution docs for existing helpers or compatibility wrappers and use those local patterns unless you can explain why they do not fit. Validate from a reproducible workspace-root entrypoint before falling back to focused leaf commands; if a build or test cannot run, report the exact command, the exact blocker, and any narrower check you ran instead. During validation, also try one bounded independent reproduction of the collected failure signal when it is safe and cheap, such as a failing test, smoke command, perf/strace comparison, or before/after runtime check. Only use `reproduced` if that command or test actually reproduced the failure; otherwise keep `observed` and report the reproduction blocker. The final explanation must connect the observed issue evidence to the actual code change, not just paraphrase the diff. Write like a maintainer is going to read the patch mail cold: explain the bug in plain language, define subsystem-specific jargon the first time you need it, and make the causal story obvious. Explicitly classify evidence confidence as `reproduced`, `observed`, or `inferred`: `reproduced` means you reproduced the failure locally; `observed` means Fixer has direct crash/log/trace evidence but you did not independently reproduce it; `inferred` means the source patch is not pull-request-ready, so do not leave a source diff unless you first gather stronger observed/reproduced evidence; otherwise return a no-patch diagnosis/report. For any source-changing `observed` patch, say explicitly in `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. Security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior need reproduced evidence plus explicit security-impact analysis before leaving a source diff; otherwise return a no-patch diagnosis/report for human review. If you introduce non-obvious state translation, index remapping, or backend split logic, add a short source comment that explains the invariant being preserved.
Start by explaining the likely root cause from the collected perf, strace, and /proc evidence. If you cannot land a safe patch, leave a diagnosis that is strong enough for an upstream bug report.
Interpreter process expectation: when the hot process is Python, Perl, shell, Node, Ruby, PHP, Lua, or another interpreter, inspect both the runtime and the script/application entrypoint from `details.interpreter_process`. Prefer the script or application package when evidence points there; do not patch the interpreter runtime merely because the hot binary is `python`, `perl`, `bash`, or similar. Runtime fixes are welcome only after checking the entrypoint and explaining why the runtime mishandles the workload or why running bad code faster/safer is itself the right upstream fix.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Keep the change narrowly scoped and summarize validation clearly.
In every authoring pass, your final response must start with `Subject: <single-line git commit subject>` and then include these markdown sections exactly:
## Commit Message
A short upstream-friendly explanation of what changed and why. Write it in plain language that a maintainer can follow without local complaint context. If you use subsystem jargon, define it immediately.
## Evidence Confidence
Exactly one word: `reproduced`, `observed`, or `inferred`. Use `reproduced` only when you reproduced the failure locally with a command or test, and include that command/test in `## Validation`. Use `observed` when Fixer has direct crash/log/trace evidence but you did not independently reproduce it. If `## Git Add Paths` lists source files for an `observed` patch, `## Issue Connection` must explicitly say the failure was observed by Fixer and not independently reproduced. Security-sensitive source changes touching authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior require reproduced evidence and explicit security-impact analysis; otherwise list `None` under `## Git Add Paths` and write a no-patch diagnosis/report. Use `inferred` for profiler/strace/indirect evidence; inferred responses may be no-patch diagnoses or reports, but inferred source patches are not pull-request-ready until stronger evidence is gathered.
## Issue Connection
Write this as maintainer-facing patch mail, not as local Fixer notes. Cover four things explicitly in readable sentences: the user-visible symptom or the exact collected signal, the code-level cause or the cautious inference from evidence, the specific change you made, and the expected effect. Do not invent a reproducer, command line, crash, or user-visible failure that is not present in the evidence bundle. If the evidence is direct-but-not-reproduced, say it was observed by Fixer and not independently reproduced. If the evidence is indirect and you did not gather stronger evidence, do not leave a source diff; write a no-patch diagnosis/report instead. Include an explicit effect sentence such as `The expected effect is ...`, `This should reduce ...`, or `This prevents ...` for source patches. If the logic is non-obvious in code, mention that you added a short explanatory comment.
## Git Add Paths
List the repo-relative paths that belong in the final patch, one per line. Use `None` only when you intentionally made no source changes. Include intentionally new files, and do not list generated build artifacts.
## Validation
List the checks you ran, or say clearly that you could not run them. Include the independent reproduction command/test and result when `## Evidence Confidence` is `reproduced`; if reproduction was attempted but blocked, name the exact blocker and keep confidence at `observed` or `inferred`.
Before editing, read the plan at `./plan-output.txt` and follow it unless the code proves part of it wrong. If you change course, say so explicitly in the final write-up instead of silently drifting from the plan.
## Review Pass 1
You are reviewing a freshly generated fixer patch.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Review the first patch pass. The original pre-edit snapshot is available at `./source` for diffing.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout. The latest author response is at `./patch-output.txt`. Inspect the current code and changed paths like a strict code reviewer. Focus on correctness, regressions, maintainability, awkward control flow such as avoidable `goto`, missing validation, weak or non-gittable commit message text, and explanations that fail to connect the observed issue evidence to the code change. Also review the maintainer experience: the patch mail should be easy to accept upstream, the user-visible bug should be explained in plain language, subsystem-specific jargon should be defined when first used, and any non-obvious state translation or index remapping in code should have a short explanatory comment. Reject patches that omit `## Evidence Confidence`, use anything other than `reproduced`, `observed`, or `inferred`, or sound more certain than that evidence level allows. Reject patches that claim `reproduced` unless `## Validation` names the concrete reproduction command or test and its result. Reject source patches in security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior unless the author reproduced the behavior and explicitly analyzed the security impact of the change; observed-only evidence should become a diagnosis/report, not a PR-ready source diff. Reject patches that invent a reproducer, command line, crash, or user-visible failure not present in the evidence bundle; indirect profiler or strace evidence may justify a cautious mitigation, but the author must say it is indirect instead of presenting it as a confirmed upstream bug. Reject patches that introduce generic libc/std APIs when nearby code or project docs provide a local compat/helper API for the same job, unless the author explicitly justifies the exception. Reject validation that only reports a leaf object/syntax build when a project-level configure/build/test entrypoint exists and was not attempted; if a full build cannot run, the author must show the exact failed command and blocker.
Do not apply code changes in this pass.
Return a short markdown review report. The first non-empty line must be exactly one of:
RESULT: ok
RESULT: fix-needed
If you choose `RESULT: fix-needed`, add a `## Findings` section with concrete, actionable items.## Plan Pass
## Problem
Fixer flagged `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` as a likely busy poll loop, but the retained evidence shows `munin-node` sleeping in `pselect6` with roughly 1.8s and 2.0s waits. The stack is consistent with the `Net::Server::Fork` accept/select loop used by `Munin::Node::Server`, not with a confirmed tight loop in Munin or Perl.
## Evidence Confidence
observed
## Proposed Subject
No source patch yet: diagnose as an observed profiler signal that is not pull-request-ready as a Munin bug fix.
## Patch Plan
Do not edit files in this pass, and do not propose a speculative runtime or application patch.
Document that the evidence bundle observed a Perl interpreter process for `munin-node`, but did not retain a Perl-level stack or a reproducer tying CPU burn to a script line. The available `strace_excerpt` shows blocking `pselect6` calls, and `status_excerpt` reports `S (sleeping)`, which weakens the “busy-poll” interpretation.
If later evidence proves a Munin-side loop, start from `script/munin-node` and `lib/Munin/Node/Server.pm`, not Perl itself. Follow existing conventions from `CONTRIBUTING.md` and `HACKING.pod`: taint-safe Perl, `use strict`, `use warnings`, English variable names, one statement per line, and file-local style. Use existing local helpers where applicable: `Munin::Common::Timeout::do_with_timeout`, `Munin::Common::Logger`, `Munin::Common::Daemon::emit_sd_notify_message`, and `Munin::Node::Server`’s `_net_read`/`_net_write` wrappers.
No prior Fixer patch is present in the workspace (`git status --short` was clean), so there is nothing to replace or improve. Avoid adding awkward control flow such as a defensive `goto`; any future fix should be a bounded change in the relevant event-loop or timeout handling path with a direct reproducer.
## Risks
A source patch from the current evidence would likely change normal daemon idle behavior without proving a bug. Touching `munin-node` request handling also risks affecting TLS negotiation, master compatibility, plugin execution, and timeout semantics.
## Validation
Before any future focused check, try the project entrypoint from the workspace root:
`make`
If available and after build prerequisites are satisfied, also try:
`make check`
This Makefile exposes `make test` rather than `check`, so the practical project test command is expected to be `make test`.
For a bounded independent reproduction attempt, run `munin-node --foreground` from a clean built tree with a minimal config and observe whether idle `pselect6` calls return immediately or block for nonzero time. Only claim `reproduced` if that command shows repeated immediate wakeups or sustained CPU, not merely normal timed sleeps.
## Patch Pass
Subject: Diagnose munin-node idle pselect profile
## Commit Message
No source change is included. The likely root cause is a profiler misclassification: the collected `munin-node` process was in `pselect6`, but the retained timings show it blocking for about two seconds at a time, and `/proc` reported the process as sleeping. That matches an idle `Net::Server::Fork` daemon waiting for work, not a proven tight event-loop spin.
## Evidence Confidence
inferred
## Issue Connection
Fixer collected a perf sample for `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` and classified it as a likely busy poll loop. The same bundle also shows `pselect6` calls lasting about 1.8s and 2.0s, `wchan` in `poll_schedule_timeout`, process state `S (sleeping)`, and only 0.9% CPU for the sampled Perl process.
The cautious code-level inference is that the observed frames come from `munin-node`’s daemon wait path, implemented through `Munin::Node::Server` on top of `Net::Server::Fork`, rather than from a Munin request handler or a Perl runtime bug. I inspected the Perl entrypoint `script/munin-node`, the server module `lib/Munin/Node/Server.pm`, and the node OS helper code; no local loop was found that matches an immediate wakeup or runaway CPU signal.
I followed the saved plan, except I classify this final result as `inferred` because the remaining evidence is profiler/strace/proc-derived and I could not independently reproduce the failure signal. I made no code change. The expected effect is that this proposal avoids landing an upstream patch that would alter normal daemon idle behavior without a demonstrated Munin bug.
Local conventions checked: `CONTRIBUTING.md` and `HACKING.pod` require taint-safe Perl, `use strict`, `use warnings`, English variable names, and file-local style. Relevant helpers found were `Munin::Common::Timeout::do_with_timeout`, `Munin::Common::Logger`, `Munin::Common::Daemon::emit_sd_notify_message`, and `Munin::Node::Server`’s `_net_read`/`_net_write`.
## Git Add Paths
None
## Validation
`make` failed from the workspace root because the environment lacks `Module::Build`: `Can't locate Module/Build.pm in @INC ... at Build.PL line 80`, followed by `make: *** [Makefile:149: Build] Error 2`.
`make check` is not available in this tree; the Makefile exposes `test`, `testpod`, and related targets, but no `check` target.
Narrow checks run after the project build blocker:
`perl -T -Ilib -c script/munin-node` passed.
`perl -Ilib -c lib/Munin/Node/Server.pm` passed.
`perl -Ilib -c lib/Munin/Node/OS.pm` passed, with redefinition warnings from the installed system Munin modules also present in `@INC`.
Independent reproduction was attempted with a minimal foreground `munin-node` config. `strace` was blocked by sandbox ptrace restrictions: `PTRACE_TRACEME: Operation not permitted`. A lower-privilege foreground smoke run was then blocked by sandbox network restrictions when binding localhost: `Cannot bind and listen to TCP port 14952 on 127.0.0.1 [Operation not permitted]`. Therefore I did not independently reproduce the reported busy-poll signal.
## Review Pass 1
RESULT: ok
The first patch pass is a no-patch diagnosis, and the workspace has no source diff. That matches the evidence: the bundle is profiler/strace/proc-derived, shows `munin-node` sleeping in `pselect6` with ~2s waits, and does not prove a Munin or Perl tight loop.
The response includes the required `## Evidence Confidence` section with an allowed value, does not claim reproduction, lists `Git Add Paths` as `None`, and explains why a source patch would be speculative. Validation is acceptable for a no-patch report: `make` was attempted first and the `Module::Build` blocker was reported, followed by narrow syntax checks and a bounded reproduction attempt that was blocked by ptrace/network sandbox restrictions.perl likely remains stuck in a busy-poll loop. A diagnosis report and patch proposal were created locally.
## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.
## Patch Pass
You are working on a bounded fixer proposal.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Produce the smallest reasonable patch for the target repository, keep the change upstreamable, prefer the clearest control flow available, and do not keep avoidable `goto` when a simpler structure would read better. Before introducing new file, process, allocation, locking, networking, or platform APIs, inspect nearby code and project contribution docs for existing helpers or compatibility wrappers and use those local patterns unless you can explain why they do not fit. Validate from a reproducible workspace-root entrypoint before falling back to focused leaf commands; if a build or test cannot run, report the exact command, the exact blocker, and any narrower check you ran instead. During validation, also try one bounded independent reproduction of the collected failure signal when it is safe and cheap, such as a failing test, smoke command, perf/strace comparison, or before/after runtime check. Only use `reproduced` if that command or test actually reproduced the failure; otherwise keep `observed` and report the reproduction blocker. The final explanation must connect the observed issue evidence to the actual code change, not just paraphrase the diff. Write like a maintainer is going to read the patch mail cold: explain the bug in plain language, define subsystem-specific jargon the first time you need it, and make the causal story obvious. Explicitly classify evidence confidence as `reproduced`, `observed`, or `inferred`: `reproduced` means you reproduced the failure locally; `observed` means Fixer has direct crash/log/trace evidence but you did not independently reproduce it; `inferred` means the source patch is not pull-request-ready, so do not leave a source diff unless you first gather stronger observed/reproduced evidence; otherwise return a no-patch diagnosis/report. For any source-changing `observed` patch, say explicitly in `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. Security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior need reproduced evidence plus explicit security-impact analysis before leaving a source diff; otherwise return a no-patch diagnosis/report for human review. If you introduce non-obvious state translation, index remapping, or backend split logic, add a short source comment that explains the invariant being preserved.
Start by explaining the likely root cause from the collected perf, strace, and /proc evidence. If you cannot land a safe patch, leave a diagnosis that is strong enough for an upstream bug report.
Interpreter process expectation: when the hot process is Python, Perl, shell, Node, Ruby, PHP, Lua, or another interpreter, inspect both the runtime and the script/application entrypoint from `details.interpreter_process`. Prefer the script or application package when evidence points there; do not patch the interpreter runtime merely because the hot binary is `python`, `perl`, `bash`, or similar. Runtime fixes are welcome only after checking the entrypoint and explaining why the runtime mishandles the workload or why running bad code faster/safer is itself the right upstream fix.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Keep the change narrowly scoped and summarize validation clearly.
In every authoring pass, your final response must start with `Subject: <single-line git commit subject>` and then include these markdown sections exactly:
## Commit Message
A short upstream-friendly explanation of what changed and why. Write it in plain language that a maintainer can follow without local complaint context. If you use subsystem jargon, define it immediately.
## Evidence Confidence
Exactly one word: `reproduced`, `observed`, or `inferred`. Use `reproduced` only when you reproduced the failure locally with a command or test, and include that command/test in `## Validation`. Use `observed` when Fixer has direct crash/log/trace evidence but you did not independently reproduce it. If `## Git Add Paths` lists source files for an `observed` patch, `## Issue Connection` must explicitly say the failure was observed by Fixer and not independently reproduced. Security-sensitive source changes touching authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior require reproduced evidence and explicit security-impact analysis; otherwise list `None` under `## Git Add Paths` and write a no-patch diagnosis/report. Use `inferred` for profiler/strace/indirect evidence; inferred responses may be no-patch diagnoses or reports, but inferred source patches are not pull-request-ready until stronger evidence is gathered.
## Issue Connection
Write this as maintainer-facing patch mail, not as local Fixer notes. Cover four things explicitly in readable sentences: the user-visible symptom or the exact collected signal, the code-level cause or the cautious inference from evidence, the specific change you made, and the expected effect. Do not invent a reproducer, command line, crash, or user-visible failure that is not present in the evidence bundle. If the evidence is direct-but-not-reproduced, say it was observed by Fixer and not independently reproduced. If the evidence is indirect and you did not gather stronger evidence, do not leave a source diff; write a no-patch diagnosis/report instead. Include an explicit effect sentence such as `The expected effect is ...`, `This should reduce ...`, or `This prevents ...` for source patches. If the logic is non-obvious in code, mention that you added a short explanatory comment.
## Git Add Paths
List the repo-relative paths that belong in the final patch, one per line. Use `None` only when you intentionally made no source changes. Include intentionally new files, and do not list generated build artifacts.
## Validation
List the checks you ran, or say clearly that you could not run them. Include the independent reproduction command/test and result when `## Evidence Confidence` is `reproduced`; if reproduction was attempted but blocked, name the exact blocker and keep confidence at `observed` or `inferred`.
Before editing, read the plan at `./plan-output.txt` and follow it unless the code proves part of it wrong. If you change course, say so explicitly in the final write-up instead of silently drifting from the plan.
## Review Pass 1
You are reviewing a freshly generated fixer patch.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Review the first patch pass. The original pre-edit snapshot is available at `./source` for diffing.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout. The latest author response is at `./patch-output.txt`. Inspect the current code and changed paths like a strict code reviewer. Focus on correctness, regressions, maintainability, awkward control flow such as avoidable `goto`, missing validation, weak or non-gittable commit message text, and explanations that fail to connect the observed issue evidence to the code change. Also review the maintainer experience: the patch mail should be easy to accept upstream, the user-visible bug should be explained in plain language, subsystem-specific jargon should be defined when first used, and any non-obvious state translation or index remapping in code should have a short explanatory comment. Reject patches that omit `## Evidence Confidence`, use anything other than `reproduced`, `observed`, or `inferred`, or sound more certain than that evidence level allows. Reject patches that claim `reproduced` unless `## Validation` names the concrete reproduction command or test and its result. Reject source patches in security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior unless the author reproduced the behavior and explicitly analyzed the security impact of the change; observed-only evidence should become a diagnosis/report, not a PR-ready source diff. Reject patches that invent a reproducer, command line, crash, or user-visible failure not present in the evidence bundle; indirect profiler or strace evidence may justify a cautious mitigation, but the author must say it is indirect instead of presenting it as a confirmed upstream bug. Reject patches that introduce generic libc/std APIs when nearby code or project docs provide a local compat/helper API for the same job, unless the author explicitly justifies the exception. Reject validation that only reports a leaf object/syntax build when a project-level configure/build/test entrypoint exists and was not attempted; if a full build cannot run, the author must show the exact failed command and blocker.
Do not apply code changes in this pass.
Return a short markdown review report. The first non-empty line must be exactly one of:
RESULT: ok
RESULT: fix-needed
If you choose `RESULT: fix-needed`, add a `## Findings` section with concrete, actionable items.## Plan Pass
## Problem
Fixer flagged `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` as a likely busy poll loop, but the retained evidence shows `munin-node` sleeping in `pselect6` with roughly 1.8s and 2.0s waits. The stack is consistent with the `Net::Server::Fork` accept/select loop used by `Munin::Node::Server`, not with a confirmed tight loop in Munin or Perl.
## Evidence Confidence
observed
## Proposed Subject
No source patch yet: diagnose as an observed profiler signal that is not pull-request-ready as a Munin bug fix.
## Patch Plan
Do not edit files in this pass, and do not propose a speculative runtime or application patch.
Document that the evidence bundle observed a Perl interpreter process for `munin-node`, but did not retain a Perl-level stack or a reproducer tying CPU burn to a script line. The available `strace_excerpt` shows blocking `pselect6` calls, and `status_excerpt` reports `S (sleeping)`, which weakens the “busy-poll” interpretation.
If later evidence proves a Munin-side loop, start from `script/munin-node` and `lib/Munin/Node/Server.pm`, not Perl itself. Follow existing conventions from `CONTRIBUTING.md` and `HACKING.pod`: taint-safe Perl, `use strict`, `use warnings`, English variable names, one statement per line, and file-local style. Use existing local helpers where applicable: `Munin::Common::Timeout::do_with_timeout`, `Munin::Common::Logger`, `Munin::Common::Daemon::emit_sd_notify_message`, and `Munin::Node::Server`’s `_net_read`/`_net_write` wrappers.
No prior Fixer patch is present in the workspace (`git status --short` was clean), so there is nothing to replace or improve. Avoid adding awkward control flow such as a defensive `goto`; any future fix should be a bounded change in the relevant event-loop or timeout handling path with a direct reproducer.
## Risks
A source patch from the current evidence would likely change normal daemon idle behavior without proving a bug. Touching `munin-node` request handling also risks affecting TLS negotiation, master compatibility, plugin execution, and timeout semantics.
## Validation
Before any future focused check, try the project entrypoint from the workspace root:
`make`
If available and after build prerequisites are satisfied, also try:
`make check`
This Makefile exposes `make test` rather than `check`, so the practical project test command is expected to be `make test`.
For a bounded independent reproduction attempt, run `munin-node --foreground` from a clean built tree with a minimal config and observe whether idle `pselect6` calls return immediately or block for nonzero time. Only claim `reproduced` if that command shows repeated immediate wakeups or sustained CPU, not merely normal timed sleeps.
## Patch Pass
Subject: Diagnose munin-node idle pselect profile
## Commit Message
No source change is included. The likely root cause is a profiler misclassification: the collected `munin-node` process was in `pselect6`, but the retained timings show it blocking for about two seconds at a time, and `/proc` reported the process as sleeping. That matches an idle `Net::Server::Fork` daemon waiting for work, not a proven tight event-loop spin.
## Evidence Confidence
inferred
## Issue Connection
Fixer collected a perf sample for `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` and classified it as a likely busy poll loop. The same bundle also shows `pselect6` calls lasting about 1.8s and 2.0s, `wchan` in `poll_schedule_timeout`, process state `S (sleeping)`, and only 0.9% CPU for the sampled Perl process.
The cautious code-level inference is that the observed frames come from `munin-node`’s daemon wait path, implemented through `Munin::Node::Server` on top of `Net::Server::Fork`, rather than from a Munin request handler or a Perl runtime bug. I inspected the Perl entrypoint `script/munin-node`, the server module `lib/Munin/Node/Server.pm`, and the node OS helper code; no local loop was found that matches an immediate wakeup or runaway CPU signal.
I followed the saved plan, except I classify this final result as `inferred` because the remaining evidence is profiler/strace/proc-derived and I could not independently reproduce the failure signal. I made no code change. The expected effect is that this proposal avoids landing an upstream patch that would alter normal daemon idle behavior without a demonstrated Munin bug.
Local conventions checked: `CONTRIBUTING.md` and `HACKING.pod` require taint-safe Perl, `use strict`, `use warnings`, English variable names, and file-local style. Relevant helpers found were `Munin::Common::Timeout::do_with_timeout`, `Munin::Common::Logger`, `Munin::Common::Daemon::emit_sd_notify_message`, and `Munin::Node::Server`’s `_net_read`/`_net_write`.
## Git Add Paths
None
## Validation
`make` failed from the workspace root because the environment lacks `Module::Build`: `Can't locate Module/Build.pm in @INC ... at Build.PL line 80`, followed by `make: *** [Makefile:149: Build] Error 2`.
`make check` is not available in this tree; the Makefile exposes `test`, `testpod`, and related targets, but no `check` target.
Narrow checks run after the project build blocker:
`perl -T -Ilib -c script/munin-node` passed.
`perl -Ilib -c lib/Munin/Node/Server.pm` passed.
`perl -Ilib -c lib/Munin/Node/OS.pm` passed, with redefinition warnings from the installed system Munin modules also present in `@INC`.
Independent reproduction was attempted with a minimal foreground `munin-node` config. `strace` was blocked by sandbox ptrace restrictions: `PTRACE_TRACEME: Operation not permitted`. A lower-privilege foreground smoke run was then blocked by sandbox network restrictions when binding localhost: `Cannot bind and listen to TCP port 14952 on 127.0.0.1 [Operation not permitted]`. Therefore I did not independently reproduce the reported busy-poll signal.
## Review Pass 1
RESULT: ok
The first patch pass is a no-patch diagnosis, and the workspace has no source diff. That matches the evidence: the bundle is profiler/strace/proc-derived, shows `munin-node` sleeping in `pselect6` with ~2s waits, and does not prove a Munin or Perl tight loop.
The response includes the required `## Evidence Confidence` section with an allowed value, does not claim reproduction, lists `Git Add Paths` as `None`, and explains why a source patch would be speculative. Validation is acceptable for a no-patch report: `make` was attempted first and the `Module::Build` blocker was reported, followed by narrow syntax checks and a bounded reproduction attempt that was blocked by ptrace/network sandbox restrictions.perl likely remains stuck in a busy-poll loop. A diagnosis report and patch proposal were created locally.
## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.
## Patch Pass
You are working on a bounded fixer proposal.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Produce the smallest reasonable patch for the target repository, keep the change upstreamable, prefer the clearest control flow available, and do not keep avoidable `goto` when a simpler structure would read better. Before introducing new file, process, allocation, locking, networking, or platform APIs, inspect nearby code and project contribution docs for existing helpers or compatibility wrappers and use those local patterns unless you can explain why they do not fit. Validate from a reproducible workspace-root entrypoint before falling back to focused leaf commands; if a build or test cannot run, report the exact command, the exact blocker, and any narrower check you ran instead. During validation, also try one bounded independent reproduction of the collected failure signal when it is safe and cheap, such as a failing test, smoke command, perf/strace comparison, or before/after runtime check. Only use `reproduced` if that command or test actually reproduced the failure; otherwise keep `observed` and report the reproduction blocker. The final explanation must connect the observed issue evidence to the actual code change, not just paraphrase the diff. Write like a maintainer is going to read the patch mail cold: explain the bug in plain language, define subsystem-specific jargon the first time you need it, and make the causal story obvious. Explicitly classify evidence confidence as `reproduced`, `observed`, or `inferred`: `reproduced` means you reproduced the failure locally; `observed` means Fixer has direct crash/log/trace evidence but you did not independently reproduce it; `inferred` means the source patch is not pull-request-ready, so do not leave a source diff unless you first gather stronger observed/reproduced evidence; otherwise return a no-patch diagnosis/report. For any source-changing `observed` patch, say explicitly in `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. Security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior need reproduced evidence plus explicit security-impact analysis before leaving a source diff; otherwise return a no-patch diagnosis/report for human review. If you introduce non-obvious state translation, index remapping, or backend split logic, add a short source comment that explains the invariant being preserved.
Start by explaining the likely root cause from the collected perf, strace, and /proc evidence. If you cannot land a safe patch, leave a diagnosis that is strong enough for an upstream bug report.
Interpreter process expectation: when the hot process is Python, Perl, shell, Node, Ruby, PHP, Lua, or another interpreter, inspect both the runtime and the script/application entrypoint from `details.interpreter_process`. Prefer the script or application package when evidence points there; do not patch the interpreter runtime merely because the hot binary is `python`, `perl`, `bash`, or similar. Runtime fixes are welcome only after checking the entrypoint and explaining why the runtime mishandles the workload or why running bad code faster/safer is itself the right upstream fix.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Keep the change narrowly scoped and summarize validation clearly.
In every authoring pass, your final response must start with `Subject: <single-line git commit subject>` and then include these markdown sections exactly:
## Commit Message
A short upstream-friendly explanation of what changed and why. Write it in plain language that a maintainer can follow without local complaint context. If you use subsystem jargon, define it immediately.
## Evidence Confidence
Exactly one word: `reproduced`, `observed`, or `inferred`. Use `reproduced` only when you reproduced the failure locally with a command or test, and include that command/test in `## Validation`. Use `observed` when Fixer has direct crash/log/trace evidence but you did not independently reproduce it. If `## Git Add Paths` lists source files for an `observed` patch, `## Issue Connection` must explicitly say the failure was observed by Fixer and not independently reproduced. Security-sensitive source changes touching authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior require reproduced evidence and explicit security-impact analysis; otherwise list `None` under `## Git Add Paths` and write a no-patch diagnosis/report. Use `inferred` for profiler/strace/indirect evidence; inferred responses may be no-patch diagnoses or reports, but inferred source patches are not pull-request-ready until stronger evidence is gathered.
## Issue Connection
Write this as maintainer-facing patch mail, not as local Fixer notes. Cover four things explicitly in readable sentences: the user-visible symptom or the exact collected signal, the code-level cause or the cautious inference from evidence, the specific change you made, and the expected effect. Do not invent a reproducer, command line, crash, or user-visible failure that is not present in the evidence bundle. If the evidence is direct-but-not-reproduced, say it was observed by Fixer and not independently reproduced. If the evidence is indirect and you did not gather stronger evidence, do not leave a source diff; write a no-patch diagnosis/report instead. Include an explicit effect sentence such as `The expected effect is ...`, `This should reduce ...`, or `This prevents ...` for source patches. If the logic is non-obvious in code, mention that you added a short explanatory comment.
## Git Add Paths
List the repo-relative paths that belong in the final patch, one per line. Use `None` only when you intentionally made no source changes. Include intentionally new files, and do not list generated build artifacts.
## Validation
List the checks you ran, or say clearly that you could not run them. Include the independent reproduction command/test and result when `## Evidence Confidence` is `reproduced`; if reproduction was attempted but blocked, name the exact blocker and keep confidence at `observed` or `inferred`.
Before editing, read the plan at `./plan-output.txt` and follow it unless the code proves part of it wrong. If you change course, say so explicitly in the final write-up instead of silently drifting from the plan.
## Review Pass 1
You are reviewing a freshly generated fixer patch.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Review the first patch pass. The original pre-edit snapshot is available at `./source` for diffing.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout. The latest author response is at `./patch-output.txt`. Inspect the current code and changed paths like a strict code reviewer. Focus on correctness, regressions, maintainability, awkward control flow such as avoidable `goto`, missing validation, weak or non-gittable commit message text, and explanations that fail to connect the observed issue evidence to the code change. Also review the maintainer experience: the patch mail should be easy to accept upstream, the user-visible bug should be explained in plain language, subsystem-specific jargon should be defined when first used, and any non-obvious state translation or index remapping in code should have a short explanatory comment. Reject patches that omit `## Evidence Confidence`, use anything other than `reproduced`, `observed`, or `inferred`, or sound more certain than that evidence level allows. Reject patches that claim `reproduced` unless `## Validation` names the concrete reproduction command or test and its result. Reject source patches in security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior unless the author reproduced the behavior and explicitly analyzed the security impact of the change; observed-only evidence should become a diagnosis/report, not a PR-ready source diff. Reject patches that invent a reproducer, command line, crash, or user-visible failure not present in the evidence bundle; indirect profiler or strace evidence may justify a cautious mitigation, but the author must say it is indirect instead of presenting it as a confirmed upstream bug. Reject patches that introduce generic libc/std APIs when nearby code or project docs provide a local compat/helper API for the same job, unless the author explicitly justifies the exception. Reject validation that only reports a leaf object/syntax build when a project-level configure/build/test entrypoint exists and was not attempted; if a full build cannot run, the author must show the exact failed command and blocker.
Do not apply code changes in this pass.
Return a short markdown review report. The first non-empty line must be exactly one of:
RESULT: ok
RESULT: fix-needed
If you choose `RESULT: fix-needed`, add a `## Findings` section with concrete, actionable items.## Plan Pass
## Problem
Fixer flagged `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` as a likely busy poll loop. The retained evidence does not tie the native `select()`/`pselect6()` frames to a Perl source line, and the strace excerpt shows blocking waits of about 1.8-2.0 seconds with process state `S (sleeping)` and only `0.9%` CPU. That looks more like normal `munin-node`/`Net::Server::Fork` idle waiting than a proven runaway loop.
## Evidence Confidence
inferred
## Proposed Subject
No source patch yet: document this as an inconclusive/likely false-positive profiler finding for `munin-node` unless an independent reproduction captures a Perl-level stack or a tight nonblocking poll loop.
## Patch Plan
Do not edit source on this pass. The evidence is profiler/native-stack only and explicitly lacks a Perl-level stack, so a PR-ready munin patch is not justified.
If later evidence proves an application loop, investigate from `script/munin-node` into `lib/Munin/Node/Server.pm` first, not Perl runtime code. Runtime investigation should remain secondary unless the reproduced trace proves Perl mishandles a blocking wait.
Follow Munin conventions found in `CONTRIBUTING.md` and `HACKING.pod`: strict/warnings Perl style, local file style, no unnecessary wrapping, and use existing helpers. Relevant local helpers/conventions are `Munin::Common::Timeout::do_with_timeout`, `Munin::Common::Logger`, `Munin::Node::Server::_net_read/_net_write`, TLS wrappers, and `Munin::Node::OS->run_as_child`. The existing node request path already uses `do_with_timeout`.
No prior Fixer patch is present in this workspace to improve or replace. If a future patch is warranted, keep it bounded with ordinary returns/conditionals; do not introduce avoidable `goto`.
## Risks
Patching from the current evidence would risk changing idle server behavior, connection handling, or timeout semantics without a demonstrated bug. This area includes timeout behavior, so any source change would need reproduced behavior and impact analysis before editing.
A local sandbox reproduction may not match the production sample because the raw investigation artifacts are not present in the workspace and the evidence bundle retained only excerpts.
## Validation
Before any focused check, try the project-level entrypoint from the workspace root:
`make`
`make check` only if a check target is available; this Makefile does not define one, so use the project test target:
`make test`
For a bounded independent reproduction attempt, use Munin’s documented dev wrappers from `HACKING.pod`: build/install a sandbox with `./dev_scripts/install clean node`, start `munin-node` via `./dev_scripts/run munin-node --foreground` or `./dev_scripts/start_munin-node`, then sample `ps -o pid,stat,pcpu,etime,wchan,args` and, if available, `strace -ttT -f -e trace=pselect6,select,poll,ppoll` for a short window. Only claim reproduction if that shows rapid poll returns or a Perl-level stack tied to the loop; blocking 2-second `pselect6` timeouts should be reported as non-reproduction.
## Patch Pass
Subject: Diagnose munin-node poll finding as inconclusive
## Commit Message
No source change is included. The collected signal points at an idle `munin-node` process blocked in `select`/`pselect6`, but it does not include a Perl-level stack or a local reproduction that ties the samples to a source bug.
## Evidence Confidence
inferred
## Issue Connection
The collected signal was `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` sampled in native `select()`/`pselect6()` frames and classified as a likely busy poll loop. The same evidence shows `pselect6` calls blocking for about 1.8-2.0 seconds, process state `S (sleeping)`, `wchan` at `poll_schedule_timeout`, and only `0.9%` CPU, so the cautious inference is that an idle `munin-node` wait was misclassified as a tight poll loop.
I inspected the Perl entrypoint first, as required for interpreter processes: `script/munin-node` delegates to `Munin::Node::Server`, which uses `Net::Server::Fork`; request processing already uses the local `Munin::Common::Timeout::do_with_timeout` helper and `Munin::Common::Logger`, and nearby child process handling uses `Munin::Node::OS->run_as_child`. I also checked `CONTRIBUTING.md` and `HACKING.pod`; no local helper or maintainer convention suggests a small source change that would address the observed samples.
No patch was made because changing timing/throttling or server wait behavior from this indirect evidence would not be pull-request-ready. The expected effect of this report is to give upstream a clear diagnosis and the next evidence needed: a Perl-level stack or syscall trace showing rapid nonblocking poll returns before changing `munin-node` or Perl runtime code.
## Git Add Paths
None
## Validation
`make` failed before build generation because `Module::Build` is missing:
`Can't locate Module/Build.pm in @INC ... at Build.PL line 80.`
`make check` failed because this Makefile has no `check` target:
`make: *** No rule to make target 'check'. Stop.`
`make test` hit the same `Module::Build` blocker as `make`.
Focused checks run after the project-level blocker:
`perl -T -Ilib -c script/munin-node` passed.
`perl -Ilib -c lib/Munin/Node/Server.pm` passed.
`perl -Ilib -c lib/Munin/Node/OS.pm` passed, with redefinition warnings from the module’s circular load path.
Independent reproduction was attempted with a temporary high-port `munin-node` config. `strace` could not run because ptrace is blocked: `PTRACE_TRACEME: Operation not permitted`. A fallback `ps` smoke attempt could not keep the server running because binding even the high test port failed: `Cannot bind and listen to TCP port 14949 on * [Operation not permitted]`. The failure was not reproduced locally.
## Review Pass 1
RESULT: ok
No source changes are present in the workspace, so there is no patch diff to reject. The response correctly treats the evidence as `inferred`, keeps `Git Add Paths` as `None`, avoids claiming reproduction, and explains why the profiler/strace signal is not enough for an upstream source patch.
Validation reporting is acceptable: project-level `make`, `make check`, and `make test` were attempted or accounted for with exact blockers, followed by focused syntax checks and a bounded reproduction attempt that was blocked by ptrace and port-binding restrictions.perl likely remains stuck in a busy-poll loop. A diagnosis report and patch proposal were created locally.
## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.
## Patch Pass
You are working on a bounded fixer proposal.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Produce the smallest reasonable patch for the target repository, keep the change upstreamable, prefer the clearest control flow available, and do not keep avoidable `goto` when a simpler structure would read better. Before introducing new file, process, allocation, locking, networking, or platform APIs, inspect nearby code and project contribution docs for existing helpers or compatibility wrappers and use those local patterns unless you can explain why they do not fit. Validate from a reproducible workspace-root entrypoint before falling back to focused leaf commands; if a build or test cannot run, report the exact command, the exact blocker, and any narrower check you ran instead. During validation, also try one bounded independent reproduction of the collected failure signal when it is safe and cheap, such as a failing test, smoke command, perf/strace comparison, or before/after runtime check. Only use `reproduced` if that command or test actually reproduced the failure; otherwise keep `observed` and report the reproduction blocker. The final explanation must connect the observed issue evidence to the actual code change, not just paraphrase the diff. Write like a maintainer is going to read the patch mail cold: explain the bug in plain language, define subsystem-specific jargon the first time you need it, and make the causal story obvious. Explicitly classify evidence confidence as `reproduced`, `observed`, or `inferred`: `reproduced` means you reproduced the failure locally; `observed` means Fixer has direct crash/log/trace evidence but you did not independently reproduce it; `inferred` means the source patch is not pull-request-ready, so do not leave a source diff unless you first gather stronger observed/reproduced evidence; otherwise return a no-patch diagnosis/report. For any source-changing `observed` patch, say explicitly in `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. Security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior need reproduced evidence plus explicit security-impact analysis before leaving a source diff; otherwise return a no-patch diagnosis/report for human review. If you introduce non-obvious state translation, index remapping, or backend split logic, add a short source comment that explains the invariant being preserved.
Start by explaining the likely root cause from the collected perf, strace, and /proc evidence. If you cannot land a safe patch, leave a diagnosis that is strong enough for an upstream bug report.
Interpreter process expectation: when the hot process is Python, Perl, shell, Node, Ruby, PHP, Lua, or another interpreter, inspect both the runtime and the script/application entrypoint from `details.interpreter_process`. Prefer the script or application package when evidence points there; do not patch the interpreter runtime merely because the hot binary is `python`, `perl`, `bash`, or similar. Runtime fixes are welcome only after checking the entrypoint and explaining why the runtime mishandles the workload or why running bad code faster/safer is itself the right upstream fix.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Keep the change narrowly scoped and summarize validation clearly.
In every authoring pass, your final response must start with `Subject: <single-line git commit subject>` and then include these markdown sections exactly:
## Commit Message
A short upstream-friendly explanation of what changed and why. Write it in plain language that a maintainer can follow without local complaint context. If you use subsystem jargon, define it immediately.
## Evidence Confidence
Exactly one word: `reproduced`, `observed`, or `inferred`. Use `reproduced` only when you reproduced the failure locally with a command or test, and include that command/test in `## Validation`. Use `observed` when Fixer has direct crash/log/trace evidence but you did not independently reproduce it. If `## Git Add Paths` lists source files for an `observed` patch, `## Issue Connection` must explicitly say the failure was observed by Fixer and not independently reproduced. Security-sensitive source changes touching authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior require reproduced evidence and explicit security-impact analysis; otherwise list `None` under `## Git Add Paths` and write a no-patch diagnosis/report. Use `inferred` for profiler/strace/indirect evidence; inferred responses may be no-patch diagnoses or reports, but inferred source patches are not pull-request-ready until stronger evidence is gathered.
## Issue Connection
Write this as maintainer-facing patch mail, not as local Fixer notes. Cover four things explicitly in readable sentences: the user-visible symptom or the exact collected signal, the code-level cause or the cautious inference from evidence, the specific change you made, and the expected effect. Do not invent a reproducer, command line, crash, or user-visible failure that is not present in the evidence bundle. If the evidence is direct-but-not-reproduced, say it was observed by Fixer and not independently reproduced. If the evidence is indirect and you did not gather stronger evidence, do not leave a source diff; write a no-patch diagnosis/report instead. Include an explicit effect sentence such as `The expected effect is ...`, `This should reduce ...`, or `This prevents ...` for source patches. If the logic is non-obvious in code, mention that you added a short explanatory comment.
## Git Add Paths
List the repo-relative paths that belong in the final patch, one per line. Use `None` only when you intentionally made no source changes. Include intentionally new files, and do not list generated build artifacts.
## Validation
List the checks you ran, or say clearly that you could not run them. Include the independent reproduction command/test and result when `## Evidence Confidence` is `reproduced`; if reproduction was attempted but blocked, name the exact blocker and keep confidence at `observed` or `inferred`.
Before editing, read the plan at `./plan-output.txt` and follow it unless the code proves part of it wrong. If you change course, say so explicitly in the final write-up instead of silently drifting from the plan.
## Review Pass 1
You are reviewing a freshly generated fixer patch.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Review the first patch pass. The original pre-edit snapshot is available at `./source` for diffing.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout. The latest author response is at `./patch-output.txt`. Inspect the current code and changed paths like a strict code reviewer. Focus on correctness, regressions, maintainability, awkward control flow such as avoidable `goto`, missing validation, weak or non-gittable commit message text, and explanations that fail to connect the observed issue evidence to the code change. Also review the maintainer experience: the patch mail should be easy to accept upstream, the user-visible bug should be explained in plain language, subsystem-specific jargon should be defined when first used, and any non-obvious state translation or index remapping in code should have a short explanatory comment. Reject patches that omit `## Evidence Confidence`, use anything other than `reproduced`, `observed`, or `inferred`, or sound more certain than that evidence level allows. Reject patches that claim `reproduced` unless `## Validation` names the concrete reproduction command or test and its result. Reject source patches in security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior unless the author reproduced the behavior and explicitly analyzed the security impact of the change; observed-only evidence should become a diagnosis/report, not a PR-ready source diff. Reject patches that invent a reproducer, command line, crash, or user-visible failure not present in the evidence bundle; indirect profiler or strace evidence may justify a cautious mitigation, but the author must say it is indirect instead of presenting it as a confirmed upstream bug. Reject patches that introduce generic libc/std APIs when nearby code or project docs provide a local compat/helper API for the same job, unless the author explicitly justifies the exception. Reject validation that only reports a leaf object/syntax build when a project-level configure/build/test entrypoint exists and was not attempted; if a full build cannot run, the author must show the exact failed command and blocker.
Do not apply code changes in this pass.
Return a short markdown review report. The first non-empty line must be exactly one of:
RESULT: ok
RESULT: fix-needed
If you choose `RESULT: fix-needed`, add a `## Findings` section with concrete, actionable items.## Plan Pass
## Problem
Fixer flagged `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` as a likely busy poll loop. The retained evidence does not tie the native `select()`/`pselect6()` frames to a Perl source line, and the strace excerpt shows blocking waits of about 1.8-2.0 seconds with process state `S (sleeping)` and only `0.9%` CPU. That looks more like normal `munin-node`/`Net::Server::Fork` idle waiting than a proven runaway loop.
## Evidence Confidence
inferred
## Proposed Subject
No source patch yet: document this as an inconclusive/likely false-positive profiler finding for `munin-node` unless an independent reproduction captures a Perl-level stack or a tight nonblocking poll loop.
## Patch Plan
Do not edit source on this pass. The evidence is profiler/native-stack only and explicitly lacks a Perl-level stack, so a PR-ready munin patch is not justified.
If later evidence proves an application loop, investigate from `script/munin-node` into `lib/Munin/Node/Server.pm` first, not Perl runtime code. Runtime investigation should remain secondary unless the reproduced trace proves Perl mishandles a blocking wait.
Follow Munin conventions found in `CONTRIBUTING.md` and `HACKING.pod`: strict/warnings Perl style, local file style, no unnecessary wrapping, and use existing helpers. Relevant local helpers/conventions are `Munin::Common::Timeout::do_with_timeout`, `Munin::Common::Logger`, `Munin::Node::Server::_net_read/_net_write`, TLS wrappers, and `Munin::Node::OS->run_as_child`. The existing node request path already uses `do_with_timeout`.
No prior Fixer patch is present in this workspace to improve or replace. If a future patch is warranted, keep it bounded with ordinary returns/conditionals; do not introduce avoidable `goto`.
## Risks
Patching from the current evidence would risk changing idle server behavior, connection handling, or timeout semantics without a demonstrated bug. This area includes timeout behavior, so any source change would need reproduced behavior and impact analysis before editing.
A local sandbox reproduction may not match the production sample because the raw investigation artifacts are not present in the workspace and the evidence bundle retained only excerpts.
## Validation
Before any focused check, try the project-level entrypoint from the workspace root:
`make`
`make check` only if a check target is available; this Makefile does not define one, so use the project test target:
`make test`
For a bounded independent reproduction attempt, use Munin’s documented dev wrappers from `HACKING.pod`: build/install a sandbox with `./dev_scripts/install clean node`, start `munin-node` via `./dev_scripts/run munin-node --foreground` or `./dev_scripts/start_munin-node`, then sample `ps -o pid,stat,pcpu,etime,wchan,args` and, if available, `strace -ttT -f -e trace=pselect6,select,poll,ppoll` for a short window. Only claim reproduction if that shows rapid poll returns or a Perl-level stack tied to the loop; blocking 2-second `pselect6` timeouts should be reported as non-reproduction.
## Patch Pass
Subject: Diagnose munin-node poll finding as inconclusive
## Commit Message
No source change is included. The collected signal points at an idle `munin-node` process blocked in `select`/`pselect6`, but it does not include a Perl-level stack or a local reproduction that ties the samples to a source bug.
## Evidence Confidence
inferred
## Issue Connection
The collected signal was `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` sampled in native `select()`/`pselect6()` frames and classified as a likely busy poll loop. The same evidence shows `pselect6` calls blocking for about 1.8-2.0 seconds, process state `S (sleeping)`, `wchan` at `poll_schedule_timeout`, and only `0.9%` CPU, so the cautious inference is that an idle `munin-node` wait was misclassified as a tight poll loop.
I inspected the Perl entrypoint first, as required for interpreter processes: `script/munin-node` delegates to `Munin::Node::Server`, which uses `Net::Server::Fork`; request processing already uses the local `Munin::Common::Timeout::do_with_timeout` helper and `Munin::Common::Logger`, and nearby child process handling uses `Munin::Node::OS->run_as_child`. I also checked `CONTRIBUTING.md` and `HACKING.pod`; no local helper or maintainer convention suggests a small source change that would address the observed samples.
No patch was made because changing timing/throttling or server wait behavior from this indirect evidence would not be pull-request-ready. The expected effect of this report is to give upstream a clear diagnosis and the next evidence needed: a Perl-level stack or syscall trace showing rapid nonblocking poll returns before changing `munin-node` or Perl runtime code.
## Git Add Paths
None
## Validation
`make` failed before build generation because `Module::Build` is missing:
`Can't locate Module/Build.pm in @INC ... at Build.PL line 80.`
`make check` failed because this Makefile has no `check` target:
`make: *** No rule to make target 'check'. Stop.`
`make test` hit the same `Module::Build` blocker as `make`.
Focused checks run after the project-level blocker:
`perl -T -Ilib -c script/munin-node` passed.
`perl -Ilib -c lib/Munin/Node/Server.pm` passed.
`perl -Ilib -c lib/Munin/Node/OS.pm` passed, with redefinition warnings from the module’s circular load path.
Independent reproduction was attempted with a temporary high-port `munin-node` config. `strace` could not run because ptrace is blocked: `PTRACE_TRACEME: Operation not permitted`. A fallback `ps` smoke attempt could not keep the server running because binding even the high test port failed: `Cannot bind and listen to TCP port 14949 on * [Operation not permitted]`. The failure was not reproduced locally.
## Review Pass 1
RESULT: ok
No source changes are present in the workspace, so there is no patch diff to reject. The response correctly treats the evidence as `inferred`, keeps `Git Add Paths` as `None`, avoids claiming reproduction, and explains why the profiler/strace signal is not enough for an upstream source patch.
Validation reporting is acceptable: project-level `make`, `make check`, and `make test` were attempted or accounted for with exact blockers, followed by focused syntax checks and a bounded reproduction attempt that was blocked by ptrace and port-binding restrictions.perl likely remains stuck in a busy-poll loop. A diagnosis report and patch proposal were created locally.
## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.
## Patch Pass
You are working on a bounded fixer proposal.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Produce the smallest reasonable patch for the target repository, keep the change upstreamable, prefer the clearest control flow available, and do not keep avoidable `goto` when a simpler structure would read better. Before introducing new file, process, allocation, locking, networking, or platform APIs, inspect nearby code and project contribution docs for existing helpers or compatibility wrappers and use those local patterns unless you can explain why they do not fit. Validate from a reproducible workspace-root entrypoint before falling back to focused leaf commands; if a build or test cannot run, report the exact command, the exact blocker, and any narrower check you ran instead. During validation, also try one bounded independent reproduction of the collected failure signal when it is safe and cheap, such as a failing test, smoke command, perf/strace comparison, or before/after runtime check. Only use `reproduced` if that command or test actually reproduced the failure; otherwise keep `observed` and report the reproduction blocker. The final explanation must connect the observed issue evidence to the actual code change, not just paraphrase the diff. Write like a maintainer is going to read the patch mail cold: explain the bug in plain language, define subsystem-specific jargon the first time you need it, and make the causal story obvious. Explicitly classify evidence confidence as `reproduced`, `observed`, or `inferred`: `reproduced` means you reproduced the failure locally; `observed` means Fixer has direct crash/log/trace evidence but you did not independently reproduce it; `inferred` means the source patch is not pull-request-ready, so do not leave a source diff unless you first gather stronger observed/reproduced evidence; otherwise return a no-patch diagnosis/report. For any source-changing `observed` patch, say explicitly in `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. Security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior need reproduced evidence plus explicit security-impact analysis before leaving a source diff; otherwise return a no-patch diagnosis/report for human review. If you introduce non-obvious state translation, index remapping, or backend split logic, add a short source comment that explains the invariant being preserved.
Start by explaining the likely root cause from the collected perf, strace, and /proc evidence. If you cannot land a safe patch, leave a diagnosis that is strong enough for an upstream bug report.
Interpreter process expectation: when the hot process is Python, Perl, shell, Node, Ruby, PHP, Lua, or another interpreter, inspect both the runtime and the script/application entrypoint from `details.interpreter_process`. Prefer the script or application package when evidence points there; do not patch the interpreter runtime merely because the hot binary is `python`, `perl`, `bash`, or similar. Runtime fixes are welcome only after checking the entrypoint and explaining why the runtime mishandles the workload or why running bad code faster/safer is itself the right upstream fix.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Keep the change narrowly scoped and summarize validation clearly.
In every authoring pass, your final response must start with `Subject: <single-line git commit subject>` and then include these markdown sections exactly:
## Commit Message
A short upstream-friendly explanation of what changed and why. Write it in plain language that a maintainer can follow without local complaint context. If you use subsystem jargon, define it immediately.
## Evidence Confidence
Exactly one word: `reproduced`, `observed`, or `inferred`. Use `reproduced` only when you reproduced the failure locally with a command or test, and include that command/test in `## Validation`. Use `observed` when Fixer has direct crash/log/trace evidence but you did not independently reproduce it. If `## Git Add Paths` lists source files for an `observed` patch, `## Issue Connection` must explicitly say the failure was observed by Fixer and not independently reproduced. Security-sensitive source changes touching authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior require reproduced evidence and explicit security-impact analysis; otherwise list `None` under `## Git Add Paths` and write a no-patch diagnosis/report. Use `inferred` for profiler/strace/indirect evidence; inferred responses may be no-patch diagnoses or reports, but inferred source patches are not pull-request-ready until stronger evidence is gathered.
## Issue Connection
Write this as maintainer-facing patch mail, not as local Fixer notes. Cover four things explicitly in readable sentences: the user-visible symptom or the exact collected signal, the code-level cause or the cautious inference from evidence, the specific change you made, and the expected effect. Do not invent a reproducer, command line, crash, or user-visible failure that is not present in the evidence bundle. If the evidence is direct-but-not-reproduced, say it was observed by Fixer and not independently reproduced. If the evidence is indirect and you did not gather stronger evidence, do not leave a source diff; write a no-patch diagnosis/report instead. Include an explicit effect sentence such as `The expected effect is ...`, `This should reduce ...`, or `This prevents ...` for source patches. If the logic is non-obvious in code, mention that you added a short explanatory comment.
## Git Add Paths
List the repo-relative paths that belong in the final patch, one per line. Use `None` only when you intentionally made no source changes. Include intentionally new files, and do not list generated build artifacts.
## Validation
List the checks you ran, or say clearly that you could not run them. Include the independent reproduction command/test and result when `## Evidence Confidence` is `reproduced`; if reproduction was attempted but blocked, name the exact blocker and keep confidence at `observed` or `inferred`.
Before editing, read the plan at `./plan-output.txt` and follow it unless the code proves part of it wrong. If you change course, say so explicitly in the final write-up instead of silently drifting from the plan.
## Review Pass 1
You are reviewing a freshly generated fixer patch.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Review the first patch pass. The original pre-edit snapshot is available at `./source` for diffing.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout. The latest author response is at `./patch-output.txt`. Inspect the current code and changed paths like a strict code reviewer. Focus on correctness, regressions, maintainability, awkward control flow such as avoidable `goto`, missing validation, weak or non-gittable commit message text, and explanations that fail to connect the observed issue evidence to the code change. Also review the maintainer experience: the patch mail should be easy to accept upstream, the user-visible bug should be explained in plain language, subsystem-specific jargon should be defined when first used, and any non-obvious state translation or index remapping in code should have a short explanatory comment. Reject patches that omit `## Evidence Confidence`, use anything other than `reproduced`, `observed`, or `inferred`, or sound more certain than that evidence level allows. Reject patches that claim `reproduced` unless `## Validation` names the concrete reproduction command or test and its result. Reject source patches in security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior unless the author reproduced the behavior and explicitly analyzed the security impact of the change; observed-only evidence should become a diagnosis/report, not a PR-ready source diff. Reject patches that invent a reproducer, command line, crash, or user-visible failure not present in the evidence bundle; indirect profiler or strace evidence may justify a cautious mitigation, but the author must say it is indirect instead of presenting it as a confirmed upstream bug. Reject patches that introduce generic libc/std APIs when nearby code or project docs provide a local compat/helper API for the same job, unless the author explicitly justifies the exception. Reject validation that only reports a leaf object/syntax build when a project-level configure/build/test entrypoint exists and was not attempted; if a full build cannot run, the author must show the exact failed command and blocker.
Do not apply code changes in this pass.
Return a short markdown review report. The first non-empty line must be exactly one of:
RESULT: ok
RESULT: fix-needed
If you choose `RESULT: fix-needed`, add a `## Findings` section with concrete, actionable items.## Plan Pass
## Problem
Fixer reported `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` in a suspected busy poll loop, but the captured signal shows `munin-node` sleeping in `pselect6` with roughly 1.8-2.0 second timeouts, process state `S`, and only `0.9%` sampled CPU. `munin-node` is implemented as `Munin::Node::Server` on `Net::Server::Fork`, whose accept loop uses `IO::Select->can_read(2)`, matching the observed two-second poll-family syscall cadence.
## Evidence Confidence
inferred
## Proposed Subject
No source patch: report/close as an unsupported runaway-CPU finding unless additional evidence shows rapid, non-blocking wakeups or a Perl-level stack inside Munin application logic.
## Patch Plan
Do not edit Munin source from this evidence alone. The evidence bundle does not prove a Munin bug: it lacks a Perl-level stack, the raw artifact paths are unavailable in this workspace, and the visible syscall timings are consistent with normal idle `Net::Server::Fork` listener behavior rather than a tight loop.
If a later patch is justified, first collect extra evidence: a live `strace -ttT` or equivalent showing repeated near-zero-duration `pselect6`/`select` returns, plus a Perl-level stack tying the loop to `script/munin-node` or `lib/Munin/Node/Server.pm`. Only then plan a bounded change around `Munin::Node::Server` using existing helpers and conventions: `Munin::Common::Timeout` for transaction timeouts, `Munin::Common::Logger` for logging, and `Munin::Node::OS->run_as_child` for plugin execution. No relevant local helper for replacing the `Net::Server::Fork` accept wait was found.
No prior Fixer patch for this issue was found in `debian/patches` or the workspace. Avoid awkward control flow such as adding `goto` or ad hoc sleep loops; any future mitigation should be a small, direct change in the responsible loop or configuration path.
## Risks
Patching now would likely change normal daemon accept behavior based on profiler-only evidence. That could reduce responsiveness, alter Net::Server semantics, or mask the real issue if the hot loop is in a plugin, TLS handshake, client behavior, or the Perl/runtime/kernel profiling path.
## Validation
Project-level validation attempted from workspace root:
`make` failed before build because `Module::Build.pm` is missing at `Build.PL line 80`.
`make check` is unavailable: `make: *** No rule to make target 'check'. Stop.`
Focused checks that do not require generated files passed:
`perl -c lib/Munin/Common/Timeout.pm`
`perl -c lib/Munin/Node/Session.pm`
Bounded independent syscall reproduction was attempted with `strace`, but ptrace is blocked in this environment: `PTRACE_TRACEME: Operation not permitted`. Static inspection of installed `Net::Server::Fork` shows the relevant idle accept wait is `can_read(2)`, matching the observed two-second `pselect6` cadence.
## Patch Pass
Subject: Diagnose munin-node select samples as idle listener evidence
## Commit Message
No source change was made. The likely root cause of the collected signal is normal idle waiting in `munin-node`’s inherited `Net::Server::Fork` accept loop, not a proven busy loop: `/proc` reported the process sleeping, strace showed `pselect6` timing out after about two seconds, and the installed `Net::Server::Fork` code waits with `IO::Select->can_read(2)`.
## Evidence Confidence
inferred
## Issue Connection
Fixer observed `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` with repeated `pselect6` samples and classified it as a likely busy poll loop. The collected details also show process state `S (sleeping)`, `wchan` in `poll_schedule_timeout`, low sampled CPU (`0.9%`), and `pselect6` calls blocking for roughly 1.8-2.0 seconds.
I inspected the Perl entrypoint (`script/munin-node`) before considering the Perl runtime. The code-level explanation is that `Munin::Node::Server` inherits from `Net::Server::Fork`, and that runtime’s accept loop polls listening sockets with a two-second `IO::Select->can_read(2)` timeout. That matches the collected syscall cadence and does not by itself show a runaway Munin loop.
Following the saved plan, I made no source change. The evidence lacks a Perl-level stack or a trace showing near-zero-duration select wakeups tied to Munin application logic, so a source patch would be speculative rather than upstream-ready. The expected effect is to avoid changing stable daemon accept behavior until stronger evidence identifies a real Munin-side defect.
I checked contribution guidance in `CONTRIBUTING.md` and `HACKING.pod`. Relevant local helpers/conventions found were `Munin::Common::Timeout` for transaction timeouts, `Munin::Common::Logger` for logging, `Munin::Common::Daemon` for daemon readiness, and `Munin::Node::OS->run_as_child` for plugin process execution. No relevant local helper was found for replacing the inherited `Net::Server::Fork` idle accept wait.
## Git Add Paths
None
## Validation
`make` from the workspace root failed before building because `Module::Build.pm` is missing:
`Can't locate Module/Build.pm in @INC ... at Build.PL line 80.`
`make check` from the workspace root failed because there is no such target:
`make: *** No rule to make target 'check'. Stop.`
Focused syntax checks that do not require generated build files passed:
`perl -c lib/Munin/Common/Timeout.pm && perl -c lib/Munin/Node/Session.pm`
Bounded independent reproduction was attempted with:
`timeout 5s strace -ttT -e trace=pselect6,select,poll,ppoll perl -MNet::Server::Fork -e '...'`
That was blocked by ptrace restrictions:
`PTRACE_TRACEME: Operation not permitted`
The workspace has no source changes (`git status --short` is clean).
## Review Pass 1
RESULT: ok
No blocking issues found. The first pass leaves no source diff, correctly classifies the evidence as `inferred`, avoids a speculative patch, and reports project-level validation attempts plus the ptrace blocker for independent reproduction. The diagnosis matches the collected `/proc`, strace, and `Net::Server::Fork` accept-loop evidence without overstating it.perl likely remains stuck in a busy-poll loop. A diagnosis report and patch proposal were created locally.
## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.
## Patch Pass
You are working on a bounded fixer proposal.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Produce the smallest reasonable patch for the target repository, keep the change upstreamable, prefer the clearest control flow available, and do not keep avoidable `goto` when a simpler structure would read better. Before introducing new file, process, allocation, locking, networking, or platform APIs, inspect nearby code and project contribution docs for existing helpers or compatibility wrappers and use those local patterns unless you can explain why they do not fit. Validate from a reproducible workspace-root entrypoint before falling back to focused leaf commands; if a build or test cannot run, report the exact command, the exact blocker, and any narrower check you ran instead. During validation, also try one bounded independent reproduction of the collected failure signal when it is safe and cheap, such as a failing test, smoke command, perf/strace comparison, or before/after runtime check. Only use `reproduced` if that command or test actually reproduced the failure; otherwise keep `observed` and report the reproduction blocker. The final explanation must connect the observed issue evidence to the actual code change, not just paraphrase the diff. Write like a maintainer is going to read the patch mail cold: explain the bug in plain language, define subsystem-specific jargon the first time you need it, and make the causal story obvious. Explicitly classify evidence confidence as `reproduced`, `observed`, or `inferred`: `reproduced` means you reproduced the failure locally; `observed` means Fixer has direct crash/log/trace evidence but you did not independently reproduce it; `inferred` means the source patch is not pull-request-ready, so do not leave a source diff unless you first gather stronger observed/reproduced evidence; otherwise return a no-patch diagnosis/report. For any source-changing `observed` patch, say explicitly in `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. Security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior need reproduced evidence plus explicit security-impact analysis before leaving a source diff; otherwise return a no-patch diagnosis/report for human review. If you introduce non-obvious state translation, index remapping, or backend split logic, add a short source comment that explains the invariant being preserved.
Start by explaining the likely root cause from the collected perf, strace, and /proc evidence. If you cannot land a safe patch, leave a diagnosis that is strong enough for an upstream bug report.
Interpreter process expectation: when the hot process is Python, Perl, shell, Node, Ruby, PHP, Lua, or another interpreter, inspect both the runtime and the script/application entrypoint from `details.interpreter_process`. Prefer the script or application package when evidence points there; do not patch the interpreter runtime merely because the hot binary is `python`, `perl`, `bash`, or similar. Runtime fixes are welcome only after checking the entrypoint and explaining why the runtime mishandles the workload or why running bad code faster/safer is itself the right upstream fix.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Keep the change narrowly scoped and summarize validation clearly.
In every authoring pass, your final response must start with `Subject: <single-line git commit subject>` and then include these markdown sections exactly:
## Commit Message
A short upstream-friendly explanation of what changed and why. Write it in plain language that a maintainer can follow without local complaint context. If you use subsystem jargon, define it immediately.
## Evidence Confidence
Exactly one word: `reproduced`, `observed`, or `inferred`. Use `reproduced` only when you reproduced the failure locally with a command or test, and include that command/test in `## Validation`. Use `observed` when Fixer has direct crash/log/trace evidence but you did not independently reproduce it. If `## Git Add Paths` lists source files for an `observed` patch, `## Issue Connection` must explicitly say the failure was observed by Fixer and not independently reproduced. Security-sensitive source changes touching authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior require reproduced evidence and explicit security-impact analysis; otherwise list `None` under `## Git Add Paths` and write a no-patch diagnosis/report. Use `inferred` for profiler/strace/indirect evidence; inferred responses may be no-patch diagnoses or reports, but inferred source patches are not pull-request-ready until stronger evidence is gathered.
## Issue Connection
Write this as maintainer-facing patch mail, not as local Fixer notes. Cover four things explicitly in readable sentences: the user-visible symptom or the exact collected signal, the code-level cause or the cautious inference from evidence, the specific change you made, and the expected effect. Do not invent a reproducer, command line, crash, or user-visible failure that is not present in the evidence bundle. If the evidence is direct-but-not-reproduced, say it was observed by Fixer and not independently reproduced. If the evidence is indirect and you did not gather stronger evidence, do not leave a source diff; write a no-patch diagnosis/report instead. Include an explicit effect sentence such as `The expected effect is ...`, `This should reduce ...`, or `This prevents ...` for source patches. If the logic is non-obvious in code, mention that you added a short explanatory comment.
## Git Add Paths
List the repo-relative paths that belong in the final patch, one per line. Use `None` only when you intentionally made no source changes. Include intentionally new files, and do not list generated build artifacts.
## Validation
List the checks you ran, or say clearly that you could not run them. Include the independent reproduction command/test and result when `## Evidence Confidence` is `reproduced`; if reproduction was attempted but blocked, name the exact blocker and keep confidence at `observed` or `inferred`.
Before editing, read the plan at `./plan-output.txt` and follow it unless the code proves part of it wrong. If you change course, say so explicitly in the final write-up instead of silently drifting from the plan.
## Review Pass 1
You are reviewing a freshly generated fixer patch.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Review the first patch pass. The original pre-edit snapshot is available at `./source` for diffing.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout. The latest author response is at `./patch-output.txt`. Inspect the current code and changed paths like a strict code reviewer. Focus on correctness, regressions, maintainability, awkward control flow such as avoidable `goto`, missing validation, weak or non-gittable commit message text, and explanations that fail to connect the observed issue evidence to the code change. Also review the maintainer experience: the patch mail should be easy to accept upstream, the user-visible bug should be explained in plain language, subsystem-specific jargon should be defined when first used, and any non-obvious state translation or index remapping in code should have a short explanatory comment. Reject patches that omit `## Evidence Confidence`, use anything other than `reproduced`, `observed`, or `inferred`, or sound more certain than that evidence level allows. Reject patches that claim `reproduced` unless `## Validation` names the concrete reproduction command or test and its result. Reject source patches in security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior unless the author reproduced the behavior and explicitly analyzed the security impact of the change; observed-only evidence should become a diagnosis/report, not a PR-ready source diff. Reject patches that invent a reproducer, command line, crash, or user-visible failure not present in the evidence bundle; indirect profiler or strace evidence may justify a cautious mitigation, but the author must say it is indirect instead of presenting it as a confirmed upstream bug. Reject patches that introduce generic libc/std APIs when nearby code or project docs provide a local compat/helper API for the same job, unless the author explicitly justifies the exception. Reject validation that only reports a leaf object/syntax build when a project-level configure/build/test entrypoint exists and was not attempted; if a full build cannot run, the author must show the exact failed command and blocker.
Do not apply code changes in this pass.
Return a short markdown review report. The first non-empty line must be exactly one of:
RESULT: ok
RESULT: fix-needed
If you choose `RESULT: fix-needed`, add a `## Findings` section with concrete, actionable items.## Plan Pass
## Problem
Fixer reported `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` in a suspected busy poll loop, but the captured signal shows `munin-node` sleeping in `pselect6` with roughly 1.8-2.0 second timeouts, process state `S`, and only `0.9%` sampled CPU. `munin-node` is implemented as `Munin::Node::Server` on `Net::Server::Fork`, whose accept loop uses `IO::Select->can_read(2)`, matching the observed two-second poll-family syscall cadence.
## Evidence Confidence
inferred
## Proposed Subject
No source patch: report/close as an unsupported runaway-CPU finding unless additional evidence shows rapid, non-blocking wakeups or a Perl-level stack inside Munin application logic.
## Patch Plan
Do not edit Munin source from this evidence alone. The evidence bundle does not prove a Munin bug: it lacks a Perl-level stack, the raw artifact paths are unavailable in this workspace, and the visible syscall timings are consistent with normal idle `Net::Server::Fork` listener behavior rather than a tight loop.
If a later patch is justified, first collect extra evidence: a live `strace -ttT` or equivalent showing repeated near-zero-duration `pselect6`/`select` returns, plus a Perl-level stack tying the loop to `script/munin-node` or `lib/Munin/Node/Server.pm`. Only then plan a bounded change around `Munin::Node::Server` using existing helpers and conventions: `Munin::Common::Timeout` for transaction timeouts, `Munin::Common::Logger` for logging, and `Munin::Node::OS->run_as_child` for plugin execution. No relevant local helper for replacing the `Net::Server::Fork` accept wait was found.
No prior Fixer patch for this issue was found in `debian/patches` or the workspace. Avoid awkward control flow such as adding `goto` or ad hoc sleep loops; any future mitigation should be a small, direct change in the responsible loop or configuration path.
## Risks
Patching now would likely change normal daemon accept behavior based on profiler-only evidence. That could reduce responsiveness, alter Net::Server semantics, or mask the real issue if the hot loop is in a plugin, TLS handshake, client behavior, or the Perl/runtime/kernel profiling path.
## Validation
Project-level validation attempted from workspace root:
`make` failed before build because `Module::Build.pm` is missing at `Build.PL line 80`.
`make check` is unavailable: `make: *** No rule to make target 'check'. Stop.`
Focused checks that do not require generated files passed:
`perl -c lib/Munin/Common/Timeout.pm`
`perl -c lib/Munin/Node/Session.pm`
Bounded independent syscall reproduction was attempted with `strace`, but ptrace is blocked in this environment: `PTRACE_TRACEME: Operation not permitted`. Static inspection of installed `Net::Server::Fork` shows the relevant idle accept wait is `can_read(2)`, matching the observed two-second `pselect6` cadence.
## Patch Pass
Subject: Diagnose munin-node select samples as idle listener evidence
## Commit Message
No source change was made. The likely root cause of the collected signal is normal idle waiting in `munin-node`’s inherited `Net::Server::Fork` accept loop, not a proven busy loop: `/proc` reported the process sleeping, strace showed `pselect6` timing out after about two seconds, and the installed `Net::Server::Fork` code waits with `IO::Select->can_read(2)`.
## Evidence Confidence
inferred
## Issue Connection
Fixer observed `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` with repeated `pselect6` samples and classified it as a likely busy poll loop. The collected details also show process state `S (sleeping)`, `wchan` in `poll_schedule_timeout`, low sampled CPU (`0.9%`), and `pselect6` calls blocking for roughly 1.8-2.0 seconds.
I inspected the Perl entrypoint (`script/munin-node`) before considering the Perl runtime. The code-level explanation is that `Munin::Node::Server` inherits from `Net::Server::Fork`, and that runtime’s accept loop polls listening sockets with a two-second `IO::Select->can_read(2)` timeout. That matches the collected syscall cadence and does not by itself show a runaway Munin loop.
Following the saved plan, I made no source change. The evidence lacks a Perl-level stack or a trace showing near-zero-duration select wakeups tied to Munin application logic, so a source patch would be speculative rather than upstream-ready. The expected effect is to avoid changing stable daemon accept behavior until stronger evidence identifies a real Munin-side defect.
I checked contribution guidance in `CONTRIBUTING.md` and `HACKING.pod`. Relevant local helpers/conventions found were `Munin::Common::Timeout` for transaction timeouts, `Munin::Common::Logger` for logging, `Munin::Common::Daemon` for daemon readiness, and `Munin::Node::OS->run_as_child` for plugin process execution. No relevant local helper was found for replacing the inherited `Net::Server::Fork` idle accept wait.
## Git Add Paths
None
## Validation
`make` from the workspace root failed before building because `Module::Build.pm` is missing:
`Can't locate Module/Build.pm in @INC ... at Build.PL line 80.`
`make check` from the workspace root failed because there is no such target:
`make: *** No rule to make target 'check'. Stop.`
Focused syntax checks that do not require generated build files passed:
`perl -c lib/Munin/Common/Timeout.pm && perl -c lib/Munin/Node/Session.pm`
Bounded independent reproduction was attempted with:
`timeout 5s strace -ttT -e trace=pselect6,select,poll,ppoll perl -MNet::Server::Fork -e '...'`
That was blocked by ptrace restrictions:
`PTRACE_TRACEME: Operation not permitted`
The workspace has no source changes (`git status --short` is clean).
## Review Pass 1
RESULT: ok
No blocking issues found. The first pass leaves no source diff, correctly classifies the evidence as `inferred`, avoids a speculative patch, and reports project-level validation attempts plus the ptrace blocker for independent reproduction. The diagnosis matches the collected `/proc`, strace, and `Net::Server::Fork` accept-loop evidence without overstating it.perl likely remains stuck in a busy-poll loop. A diagnosis report and patch proposal were created locally.
## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.
## Patch Pass
You are working on a bounded fixer proposal.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Produce the smallest reasonable patch for the target repository, keep the change upstreamable, prefer the clearest control flow available, and do not keep avoidable `goto` when a simpler structure would read better. Before introducing new file, process, allocation, locking, networking, or platform APIs, inspect nearby code and project contribution docs for existing helpers or compatibility wrappers and use those local patterns unless you can explain why they do not fit. Validate from a reproducible workspace-root entrypoint before falling back to focused leaf commands; if a build or test cannot run, report the exact command, the exact blocker, and any narrower check you ran instead. During validation, also try one bounded independent reproduction of the collected failure signal when it is safe and cheap, such as a failing test, smoke command, perf/strace comparison, or before/after runtime check. Only use `reproduced` if that command or test actually reproduced the failure; otherwise keep `observed` and report the reproduction blocker. The final explanation must connect the observed issue evidence to the actual code change, not just paraphrase the diff. Write like a maintainer is going to read the patch mail cold: explain the bug in plain language, define subsystem-specific jargon the first time you need it, and make the causal story obvious. Explicitly classify evidence confidence as `reproduced`, `observed`, or `inferred`: `reproduced` means you reproduced the failure locally; `observed` means Fixer has direct crash/log/trace evidence but you did not independently reproduce it; `inferred` means the source patch is not pull-request-ready, so do not leave a source diff unless you first gather stronger observed/reproduced evidence; otherwise return a no-patch diagnosis/report. For any source-changing `observed` patch, say explicitly in `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. Security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior need reproduced evidence plus explicit security-impact analysis before leaving a source diff; otherwise return a no-patch diagnosis/report for human review. If you introduce non-obvious state translation, index remapping, or backend split logic, add a short source comment that explains the invariant being preserved.
Start by explaining the likely root cause from the collected perf, strace, and /proc evidence. If you cannot land a safe patch, leave a diagnosis that is strong enough for an upstream bug report.
Interpreter process expectation: when the hot process is Python, Perl, shell, Node, Ruby, PHP, Lua, or another interpreter, inspect both the runtime and the script/application entrypoint from `details.interpreter_process`. Prefer the script or application package when evidence points there; do not patch the interpreter runtime merely because the hot binary is `python`, `perl`, `bash`, or similar. Runtime fixes are welcome only after checking the entrypoint and explaining why the runtime mishandles the workload or why running bad code faster/safer is itself the right upstream fix.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Keep the change narrowly scoped and summarize validation clearly.
In every authoring pass, your final response must start with `Subject: <single-line git commit subject>` and then include these markdown sections exactly:
## Commit Message
A short upstream-friendly explanation of what changed and why. Write it in plain language that a maintainer can follow without local complaint context. If you use subsystem jargon, define it immediately.
## Evidence Confidence
Exactly one word: `reproduced`, `observed`, or `inferred`. Use `reproduced` only when you reproduced the failure locally with a command or test, and include that command/test in `## Validation`. Use `observed` when Fixer has direct crash/log/trace evidence but you did not independently reproduce it. If `## Git Add Paths` lists source files for an `observed` patch, `## Issue Connection` must explicitly say the failure was observed by Fixer and not independently reproduced. Security-sensitive source changes touching authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior require reproduced evidence and explicit security-impact analysis; otherwise list `None` under `## Git Add Paths` and write a no-patch diagnosis/report. Use `inferred` for profiler/strace/indirect evidence; inferred responses may be no-patch diagnoses or reports, but inferred source patches are not pull-request-ready until stronger evidence is gathered.
## Issue Connection
Write this as maintainer-facing patch mail, not as local Fixer notes. Cover four things explicitly in readable sentences: the user-visible symptom or the exact collected signal, the code-level cause or the cautious inference from evidence, the specific change you made, and the expected effect. Do not invent a reproducer, command line, crash, or user-visible failure that is not present in the evidence bundle. If the evidence is direct-but-not-reproduced, say it was observed by Fixer and not independently reproduced. If the evidence is indirect and you did not gather stronger evidence, do not leave a source diff; write a no-patch diagnosis/report instead. Include an explicit effect sentence such as `The expected effect is ...`, `This should reduce ...`, or `This prevents ...` for source patches. If the logic is non-obvious in code, mention that you added a short explanatory comment.
## Git Add Paths
List the repo-relative paths that belong in the final patch, one per line. Use `None` only when you intentionally made no source changes. Include intentionally new files, and do not list generated build artifacts.
## Validation
List the checks you ran, or say clearly that you could not run them. Include the independent reproduction command/test and result when `## Evidence Confidence` is `reproduced`; if reproduction was attempted but blocked, name the exact blocker and keep confidence at `observed` or `inferred`.
Before editing, read the plan at `./plan-output.txt` and follow it unless the code proves part of it wrong. If you change course, say so explicitly in the final write-up instead of silently drifting from the plan.
## Review Pass 1
You are reviewing a freshly generated fixer patch.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Review the first patch pass. The original pre-edit snapshot is available at `./source` for diffing.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout. The latest author response is at `./patch-output.txt`. Inspect the current code and changed paths like a strict code reviewer. Focus on correctness, regressions, maintainability, awkward control flow such as avoidable `goto`, missing validation, weak or non-gittable commit message text, and explanations that fail to connect the observed issue evidence to the code change. Also review the maintainer experience: the patch mail should be easy to accept upstream, the user-visible bug should be explained in plain language, subsystem-specific jargon should be defined when first used, and any non-obvious state translation or index remapping in code should have a short explanatory comment. Reject patches that omit `## Evidence Confidence`, use anything other than `reproduced`, `observed`, or `inferred`, or sound more certain than that evidence level allows. Reject patches that claim `reproduced` unless `## Validation` names the concrete reproduction command or test and its result. Reject source patches in security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior unless the author reproduced the behavior and explicitly analyzed the security impact of the change; observed-only evidence should become a diagnosis/report, not a PR-ready source diff. Reject patches that invent a reproducer, command line, crash, or user-visible failure not present in the evidence bundle; indirect profiler or strace evidence may justify a cautious mitigation, but the author must say it is indirect instead of presenting it as a confirmed upstream bug. Reject patches that introduce generic libc/std APIs when nearby code or project docs provide a local compat/helper API for the same job, unless the author explicitly justifies the exception. Reject validation that only reports a leaf object/syntax build when a project-level configure/build/test entrypoint exists and was not attempted; if a full build cannot run, the author must show the exact failed command and blocker.
Do not apply code changes in this pass.
Return a short markdown review report. The first non-empty line must be exactly one of:
RESULT: ok
RESULT: fix-needed
If you choose `RESULT: fix-needed`, add a `## Findings` section with concrete, actionable items.## Plan Pass
## Problem
Fixer observed `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` in repeated `pselect6`, but the retained evidence shows `munin-node` sleeping in `poll_schedule_timeout` with ~1.8-2.0s timeouts and only 0.9% CPU. There is no retained Perl-level stack tying the samples to a Munin source line, and the raw investigation files are not available in this workspace.
## Evidence Confidence
inferred
## Proposed Subject
No source patch yet: diagnose `munin-node` idle polling evidence before changing timing behavior.
## Patch Plan
Do not edit Munin in this pass. A source patch would touch listener timing/throttling behavior, which is security-sensitive under the instructions, and the current evidence does not reproduce or prove a harmful busy loop.
If more evidence is collected later, start from `script/munin-node` and `lib/Munin/Node/Server.pm`, not Perl runtime internals. The relevant local conventions are `use strict; use warnings;`, taint-compatible script execution, `Munin::Common::Logger` for logging, `Munin::Common::Timeout` for bounded operations, and `Munin::Node::OS->run_as_child` for plugin process handling. The listener itself is delegated to `Net::Server::Fork`; I found no Munin-local file IO, socket accept, or event-loop wrapper to replace it.
No prior Fixer patch is present in the workspace. If a future patch is justified, keep it upstream-style in the Munin node subsystem, avoid awkward control flow such as avoidable `goto`, and prefer a small bounded change through existing Net::Server configuration/hooks over hand-rolled polling.
## Risks
Changing the accept loop or timeout cadence without reproduction could increase latency, mask signal handling, affect child reaping, or alter daemon availability. The evidence currently looks compatible with normal timed blocking rather than runaway CPU, so a speculative mitigation would not be pull-request-ready.
## Validation
Tried project-level entrypoints from the workspace root:
`make` failed before build: `Can't locate Module/Build.pm in @INC` from `Build.PL`.
`make check` failed: no `check` target exists.
Focused fallback checks:
`perl -T -c -Ilib script/munin-node` passed.
`perl -c -Ilib lib/Munin/Node/Server.pm` passed.
Bounded reproduction attempts:
`strace ... munin-node` could not run because ptrace is not permitted in the sandbox.
A temporary foreground `munin-node` smoke run could not bind a high localhost port: `Cannot bind and listen ... [Operation not permitted]`.
Before any source patch, collect a real Perl-level stack or syscall trace from a running affected `munin-node`, for example the evidence bundle’s suggested `strace -ttT -f ... -p <pid>` plus a Perl/module-level stack if available.
## Patch Pass
Subject: No patch: diagnose munin-node pselect evidence
## Commit Message
No source change is proposed. The collected signal looks like an idle `munin-node` process blocked in the listener wait path, not a confirmed runaway CPU bug: `/proc` reported the process as sleeping, `wchan` was `poll_schedule_timeout`, and strace showed only three `pselect6` calls over five seconds with ~2 second blocking durations.
## Evidence Confidence
inferred
## Issue Connection
Fixer collected a perf/strace signal from `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` and classified it as a likely busy poll loop. The retained evidence does not include a Perl-level stack or reproducible command tying the wait to a Munin source line, and the available `/proc` and strace excerpts point to timed blocking rather than rapid polling.
I inspected the Perl script entrypoint, `script/munin-node`, before considering the Perl runtime. The entrypoint delegates the daemon accept loop to `Munin::Node::Server`, which subclasses `Net::Server::Fork`; nearby Munin code uses `Munin::Common::Logger`, `Munin::Common::Timeout`, and `Munin::Node::OS->run_as_child` for logging, bounded operations, and plugin subprocesses. I found no Munin-local event-loop wrapper that would fit a safer narrow change.
I made no source change. A patch here would alter listener timing/throttling behavior, which requires reproduced evidence and security-impact analysis under the proposal rules. The expected effect is that this avoids an upstream-unready timing change and leaves a concrete report: collect a Perl-level stack or attach-time syscall trace from an affected live `munin-node` before patching.
This follows the saved plan in `plan-output.txt`; I did not change course.
## Git Add Paths
None
## Validation
Project-level validation from workspace root:
`make` failed because `Module::Build.pm` is missing:
`Can't locate Module/Build.pm in @INC ... at Build.PL line 80.`
`make check` failed because this tree has no `check` target:
`make: *** No rule to make target 'check'. Stop.`
Focused checks run instead:
`perl -T -c -Ilib script/munin-node` passed.
`perl -c -Ilib lib/Munin/Node/Server.pm` passed.
Bounded independent reproduction attempts:
`strace -ttT -f -e trace=pselect6,select,poll,ppoll,epoll_wait,nanosleep,clock_nanosleep perl -T -Ilib script/munin-node ...` was blocked by sandbox ptrace restrictions:
`PTRACE_TRACEME: Operation not permitted`.
A foreground `munin-node` smoke run with temporary config could not bind localhost in this sandbox:
`Cannot bind and listen to TCP port 49494 on 127.0.0.1 [Operation not permitted]`.
`git diff --stat` produced no output, confirming no source diff was left.
## Review Pass 1
RESULT: ok
No source diff is present, and the author correctly treated the evidence as `inferred` rather than landing a timing/throttling change without local reproduction. The response reads as a no-patch diagnosis, ties the evidence to `munin-node`’s `Net::Server::Fork` listener path, names relevant local conventions/helpers, and reports project-level validation attempts with exact blockers.
The validation also includes bounded reproduction attempts and keeps confidence below `reproduced` because both syscall tracing and local socket binding were blocked. This is appropriate for the evidence bundle and security-sensitive timing behavior.perl likely remains stuck in a busy-poll loop. A diagnosis report and patch proposal were created locally.
## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.
## Patch Pass
You are working on a bounded fixer proposal.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Produce the smallest reasonable patch for the target repository, keep the change upstreamable, prefer the clearest control flow available, and do not keep avoidable `goto` when a simpler structure would read better. Before introducing new file, process, allocation, locking, networking, or platform APIs, inspect nearby code and project contribution docs for existing helpers or compatibility wrappers and use those local patterns unless you can explain why they do not fit. Validate from a reproducible workspace-root entrypoint before falling back to focused leaf commands; if a build or test cannot run, report the exact command, the exact blocker, and any narrower check you ran instead. During validation, also try one bounded independent reproduction of the collected failure signal when it is safe and cheap, such as a failing test, smoke command, perf/strace comparison, or before/after runtime check. Only use `reproduced` if that command or test actually reproduced the failure; otherwise keep `observed` and report the reproduction blocker. The final explanation must connect the observed issue evidence to the actual code change, not just paraphrase the diff. Write like a maintainer is going to read the patch mail cold: explain the bug in plain language, define subsystem-specific jargon the first time you need it, and make the causal story obvious. Explicitly classify evidence confidence as `reproduced`, `observed`, or `inferred`: `reproduced` means you reproduced the failure locally; `observed` means Fixer has direct crash/log/trace evidence but you did not independently reproduce it; `inferred` means the source patch is not pull-request-ready, so do not leave a source diff unless you first gather stronger observed/reproduced evidence; otherwise return a no-patch diagnosis/report. For any source-changing `observed` patch, say explicitly in `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. Security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior need reproduced evidence plus explicit security-impact analysis before leaving a source diff; otherwise return a no-patch diagnosis/report for human review. If you introduce non-obvious state translation, index remapping, or backend split logic, add a short source comment that explains the invariant being preserved.
Start by explaining the likely root cause from the collected perf, strace, and /proc evidence. If you cannot land a safe patch, leave a diagnosis that is strong enough for an upstream bug report.
Interpreter process expectation: when the hot process is Python, Perl, shell, Node, Ruby, PHP, Lua, or another interpreter, inspect both the runtime and the script/application entrypoint from `details.interpreter_process`. Prefer the script or application package when evidence points there; do not patch the interpreter runtime merely because the hot binary is `python`, `perl`, `bash`, or similar. Runtime fixes are welcome only after checking the entrypoint and explaining why the runtime mishandles the workload or why running bad code faster/safer is itself the right upstream fix.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Keep the change narrowly scoped and summarize validation clearly.
In every authoring pass, your final response must start with `Subject: <single-line git commit subject>` and then include these markdown sections exactly:
## Commit Message
A short upstream-friendly explanation of what changed and why. Write it in plain language that a maintainer can follow without local complaint context. If you use subsystem jargon, define it immediately.
## Evidence Confidence
Exactly one word: `reproduced`, `observed`, or `inferred`. Use `reproduced` only when you reproduced the failure locally with a command or test, and include that command/test in `## Validation`. Use `observed` when Fixer has direct crash/log/trace evidence but you did not independently reproduce it. If `## Git Add Paths` lists source files for an `observed` patch, `## Issue Connection` must explicitly say the failure was observed by Fixer and not independently reproduced. Security-sensitive source changes touching authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior require reproduced evidence and explicit security-impact analysis; otherwise list `None` under `## Git Add Paths` and write a no-patch diagnosis/report. Use `inferred` for profiler/strace/indirect evidence; inferred responses may be no-patch diagnoses or reports, but inferred source patches are not pull-request-ready until stronger evidence is gathered.
## Issue Connection
Write this as maintainer-facing patch mail, not as local Fixer notes. Cover four things explicitly in readable sentences: the user-visible symptom or the exact collected signal, the code-level cause or the cautious inference from evidence, the specific change you made, and the expected effect. Do not invent a reproducer, command line, crash, or user-visible failure that is not present in the evidence bundle. If the evidence is direct-but-not-reproduced, say it was observed by Fixer and not independently reproduced. If the evidence is indirect and you did not gather stronger evidence, do not leave a source diff; write a no-patch diagnosis/report instead. Include an explicit effect sentence such as `The expected effect is ...`, `This should reduce ...`, or `This prevents ...` for source patches. If the logic is non-obvious in code, mention that you added a short explanatory comment.
## Git Add Paths
List the repo-relative paths that belong in the final patch, one per line. Use `None` only when you intentionally made no source changes. Include intentionally new files, and do not list generated build artifacts.
## Validation
List the checks you ran, or say clearly that you could not run them. Include the independent reproduction command/test and result when `## Evidence Confidence` is `reproduced`; if reproduction was attempted but blocked, name the exact blocker and keep confidence at `observed` or `inferred`.
Before editing, read the plan at `./plan-output.txt` and follow it unless the code proves part of it wrong. If you change course, say so explicitly in the final write-up instead of silently drifting from the plan.
## Review Pass 1
You are reviewing a freshly generated fixer patch.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Review the first patch pass. The original pre-edit snapshot is available at `./source` for diffing.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout. The latest author response is at `./patch-output.txt`. Inspect the current code and changed paths like a strict code reviewer. Focus on correctness, regressions, maintainability, awkward control flow such as avoidable `goto`, missing validation, weak or non-gittable commit message text, and explanations that fail to connect the observed issue evidence to the code change. Also review the maintainer experience: the patch mail should be easy to accept upstream, the user-visible bug should be explained in plain language, subsystem-specific jargon should be defined when first used, and any non-obvious state translation or index remapping in code should have a short explanatory comment. Reject patches that omit `## Evidence Confidence`, use anything other than `reproduced`, `observed`, or `inferred`, or sound more certain than that evidence level allows. Reject patches that claim `reproduced` unless `## Validation` names the concrete reproduction command or test and its result. Reject source patches in security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior unless the author reproduced the behavior and explicitly analyzed the security impact of the change; observed-only evidence should become a diagnosis/report, not a PR-ready source diff. Reject patches that invent a reproducer, command line, crash, or user-visible failure not present in the evidence bundle; indirect profiler or strace evidence may justify a cautious mitigation, but the author must say it is indirect instead of presenting it as a confirmed upstream bug. Reject patches that introduce generic libc/std APIs when nearby code or project docs provide a local compat/helper API for the same job, unless the author explicitly justifies the exception. Reject validation that only reports a leaf object/syntax build when a project-level configure/build/test entrypoint exists and was not attempted; if a full build cannot run, the author must show the exact failed command and blocker.
Do not apply code changes in this pass.
Return a short markdown review report. The first non-empty line must be exactly one of:
RESULT: ok
RESULT: fix-needed
If you choose `RESULT: fix-needed`, add a `## Findings` section with concrete, actionable items.## Plan Pass
## Problem
Fixer observed `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` in repeated `pselect6`, but the retained evidence shows `munin-node` sleeping in `poll_schedule_timeout` with ~1.8-2.0s timeouts and only 0.9% CPU. There is no retained Perl-level stack tying the samples to a Munin source line, and the raw investigation files are not available in this workspace.
## Evidence Confidence
inferred
## Proposed Subject
No source patch yet: diagnose `munin-node` idle polling evidence before changing timing behavior.
## Patch Plan
Do not edit Munin in this pass. A source patch would touch listener timing/throttling behavior, which is security-sensitive under the instructions, and the current evidence does not reproduce or prove a harmful busy loop.
If more evidence is collected later, start from `script/munin-node` and `lib/Munin/Node/Server.pm`, not Perl runtime internals. The relevant local conventions are `use strict; use warnings;`, taint-compatible script execution, `Munin::Common::Logger` for logging, `Munin::Common::Timeout` for bounded operations, and `Munin::Node::OS->run_as_child` for plugin process handling. The listener itself is delegated to `Net::Server::Fork`; I found no Munin-local file IO, socket accept, or event-loop wrapper to replace it.
No prior Fixer patch is present in the workspace. If a future patch is justified, keep it upstream-style in the Munin node subsystem, avoid awkward control flow such as avoidable `goto`, and prefer a small bounded change through existing Net::Server configuration/hooks over hand-rolled polling.
## Risks
Changing the accept loop or timeout cadence without reproduction could increase latency, mask signal handling, affect child reaping, or alter daemon availability. The evidence currently looks compatible with normal timed blocking rather than runaway CPU, so a speculative mitigation would not be pull-request-ready.
## Validation
Tried project-level entrypoints from the workspace root:
`make` failed before build: `Can't locate Module/Build.pm in @INC` from `Build.PL`.
`make check` failed: no `check` target exists.
Focused fallback checks:
`perl -T -c -Ilib script/munin-node` passed.
`perl -c -Ilib lib/Munin/Node/Server.pm` passed.
Bounded reproduction attempts:
`strace ... munin-node` could not run because ptrace is not permitted in the sandbox.
A temporary foreground `munin-node` smoke run could not bind a high localhost port: `Cannot bind and listen ... [Operation not permitted]`.
Before any source patch, collect a real Perl-level stack or syscall trace from a running affected `munin-node`, for example the evidence bundle’s suggested `strace -ttT -f ... -p <pid>` plus a Perl/module-level stack if available.
## Patch Pass
Subject: No patch: diagnose munin-node pselect evidence
## Commit Message
No source change is proposed. The collected signal looks like an idle `munin-node` process blocked in the listener wait path, not a confirmed runaway CPU bug: `/proc` reported the process as sleeping, `wchan` was `poll_schedule_timeout`, and strace showed only three `pselect6` calls over five seconds with ~2 second blocking durations.
## Evidence Confidence
inferred
## Issue Connection
Fixer collected a perf/strace signal from `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` and classified it as a likely busy poll loop. The retained evidence does not include a Perl-level stack or reproducible command tying the wait to a Munin source line, and the available `/proc` and strace excerpts point to timed blocking rather than rapid polling.
I inspected the Perl script entrypoint, `script/munin-node`, before considering the Perl runtime. The entrypoint delegates the daemon accept loop to `Munin::Node::Server`, which subclasses `Net::Server::Fork`; nearby Munin code uses `Munin::Common::Logger`, `Munin::Common::Timeout`, and `Munin::Node::OS->run_as_child` for logging, bounded operations, and plugin subprocesses. I found no Munin-local event-loop wrapper that would fit a safer narrow change.
I made no source change. A patch here would alter listener timing/throttling behavior, which requires reproduced evidence and security-impact analysis under the proposal rules. The expected effect is that this avoids an upstream-unready timing change and leaves a concrete report: collect a Perl-level stack or attach-time syscall trace from an affected live `munin-node` before patching.
This follows the saved plan in `plan-output.txt`; I did not change course.
## Git Add Paths
None
## Validation
Project-level validation from workspace root:
`make` failed because `Module::Build.pm` is missing:
`Can't locate Module/Build.pm in @INC ... at Build.PL line 80.`
`make check` failed because this tree has no `check` target:
`make: *** No rule to make target 'check'. Stop.`
Focused checks run instead:
`perl -T -c -Ilib script/munin-node` passed.
`perl -c -Ilib lib/Munin/Node/Server.pm` passed.
Bounded independent reproduction attempts:
`strace -ttT -f -e trace=pselect6,select,poll,ppoll,epoll_wait,nanosleep,clock_nanosleep perl -T -Ilib script/munin-node ...` was blocked by sandbox ptrace restrictions:
`PTRACE_TRACEME: Operation not permitted`.
A foreground `munin-node` smoke run with temporary config could not bind localhost in this sandbox:
`Cannot bind and listen to TCP port 49494 on 127.0.0.1 [Operation not permitted]`.
`git diff --stat` produced no output, confirming no source diff was left.
## Review Pass 1
RESULT: ok
No source diff is present, and the author correctly treated the evidence as `inferred` rather than landing a timing/throttling change without local reproduction. The response reads as a no-patch diagnosis, ties the evidence to `munin-node`’s `Net::Server::Fork` listener path, names relevant local conventions/helpers, and reports project-level validation attempts with exact blockers.
The validation also includes bounded reproduction attempts and keeps confidence below `reproduced` because both syscall tracing and local socket binding were blocked. This is appropriate for the evidence bundle and security-sensitive timing behavior.perl likely remains stuck in a busy-poll loop. A diagnosis report and patch proposal were created locally.
## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.
## Patch Pass
You are working on a bounded fixer proposal.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Produce the smallest reasonable patch for the target repository, keep the change upstreamable, prefer the clearest control flow available, and do not keep avoidable `goto` when a simpler structure would read better. Before introducing new file, process, allocation, locking, networking, or platform APIs, inspect nearby code and project contribution docs for existing helpers or compatibility wrappers and use those local patterns unless you can explain why they do not fit. Validate from a reproducible workspace-root entrypoint before falling back to focused leaf commands; if a build or test cannot run, report the exact command, the exact blocker, and any narrower check you ran instead. During validation, also try one bounded independent reproduction of the collected failure signal when it is safe and cheap, such as a failing test, smoke command, perf/strace comparison, or before/after runtime check. Only use `reproduced` if that command or test actually reproduced the failure; otherwise keep `observed` and report the reproduction blocker. The final explanation must connect the observed issue evidence to the actual code change, not just paraphrase the diff. Write like a maintainer is going to read the patch mail cold: explain the bug in plain language, define subsystem-specific jargon the first time you need it, and make the causal story obvious. Explicitly classify evidence confidence as `reproduced`, `observed`, or `inferred`: `reproduced` means you reproduced the failure locally; `observed` means Fixer has direct crash/log/trace evidence but you did not independently reproduce it; `inferred` means the source patch is not pull-request-ready, so do not leave a source diff unless you first gather stronger observed/reproduced evidence; otherwise return a no-patch diagnosis/report. For any source-changing `observed` patch, say explicitly in `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. Security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior need reproduced evidence plus explicit security-impact analysis before leaving a source diff; otherwise return a no-patch diagnosis/report for human review. If you introduce non-obvious state translation, index remapping, or backend split logic, add a short source comment that explains the invariant being preserved.
Start by explaining the likely root cause from the collected perf, strace, and /proc evidence. If you cannot land a safe patch, leave a diagnosis that is strong enough for an upstream bug report.
Interpreter process expectation: when the hot process is Python, Perl, shell, Node, Ruby, PHP, Lua, or another interpreter, inspect both the runtime and the script/application entrypoint from `details.interpreter_process`. Prefer the script or application package when evidence points there; do not patch the interpreter runtime merely because the hot binary is `python`, `perl`, `bash`, or similar. Runtime fixes are welcome only after checking the entrypoint and explaining why the runtime mishandles the workload or why running bad code faster/safer is itself the right upstream fix.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Keep the change narrowly scoped and summarize validation clearly.
In every authoring pass, your final response must start with `Subject: <single-line git commit subject>` and then include these markdown sections exactly:
## Commit Message
A short upstream-friendly explanation of what changed and why. Write it in plain language that a maintainer can follow without local complaint context. If you use subsystem jargon, define it immediately.
## Evidence Confidence
Exactly one word: `reproduced`, `observed`, or `inferred`. Use `reproduced` only when you reproduced the failure locally with a command or test, and include that command/test in `## Validation`. Use `observed` when Fixer has direct crash/log/trace evidence but you did not independently reproduce it. If `## Git Add Paths` lists source files for an `observed` patch, `## Issue Connection` must explicitly say the failure was observed by Fixer and not independently reproduced. Security-sensitive source changes touching authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior require reproduced evidence and explicit security-impact analysis; otherwise list `None` under `## Git Add Paths` and write a no-patch diagnosis/report. Use `inferred` for profiler/strace/indirect evidence; inferred responses may be no-patch diagnoses or reports, but inferred source patches are not pull-request-ready until stronger evidence is gathered.
## Issue Connection
Write this as maintainer-facing patch mail, not as local Fixer notes. Cover four things explicitly in readable sentences: the user-visible symptom or the exact collected signal, the code-level cause or the cautious inference from evidence, the specific change you made, and the expected effect. Do not invent a reproducer, command line, crash, or user-visible failure that is not present in the evidence bundle. If the evidence is direct-but-not-reproduced, say it was observed by Fixer and not independently reproduced. If the evidence is indirect and you did not gather stronger evidence, do not leave a source diff; write a no-patch diagnosis/report instead. Include an explicit effect sentence such as `The expected effect is ...`, `This should reduce ...`, or `This prevents ...` for source patches. If the logic is non-obvious in code, mention that you added a short explanatory comment.
## Git Add Paths
List the repo-relative paths that belong in the final patch, one per line. Use `None` only when you intentionally made no source changes. Include intentionally new files, and do not list generated build artifacts.
## Validation
List the checks you ran, or say clearly that you could not run them. Include the independent reproduction command/test and result when `## Evidence Confidence` is `reproduced`; if reproduction was attempted but blocked, name the exact blocker and keep confidence at `observed` or `inferred`.
Before editing, read the plan at `./plan-output.txt` and follow it unless the code proves part of it wrong. If you change course, say so explicitly in the final write-up instead of silently drifting from the plan.
## Review Pass 1
You are reviewing a freshly generated fixer patch.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Review the first patch pass. The original pre-edit snapshot is available at `./source` for diffing.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout. The latest author response is at `./patch-output.txt`. Inspect the current code and changed paths like a strict code reviewer. Focus on correctness, regressions, maintainability, awkward control flow such as avoidable `goto`, missing validation, weak or non-gittable commit message text, and explanations that fail to connect the observed issue evidence to the code change. Also review the maintainer experience: the patch mail should be easy to accept upstream, the user-visible bug should be explained in plain language, subsystem-specific jargon should be defined when first used, and any non-obvious state translation or index remapping in code should have a short explanatory comment. Reject patches that omit `## Evidence Confidence`, use anything other than `reproduced`, `observed`, or `inferred`, or sound more certain than that evidence level allows. Reject patches that claim `reproduced` unless `## Validation` names the concrete reproduction command or test and its result. Reject source patches in security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior unless the author reproduced the behavior and explicitly analyzed the security impact of the change; observed-only evidence should become a diagnosis/report, not a PR-ready source diff. Reject patches that invent a reproducer, command line, crash, or user-visible failure not present in the evidence bundle; indirect profiler or strace evidence may justify a cautious mitigation, but the author must say it is indirect instead of presenting it as a confirmed upstream bug. Reject patches that introduce generic libc/std APIs when nearby code or project docs provide a local compat/helper API for the same job, unless the author explicitly justifies the exception. Reject validation that only reports a leaf object/syntax build when a project-level configure/build/test entrypoint exists and was not attempted; if a full build cannot run, the author must show the exact failed command and blocker.
Do not apply code changes in this pass.
Return a short markdown review report. The first non-empty line must be exactly one of:
RESULT: ok
RESULT: fix-needed
If you choose `RESULT: fix-needed`, add a `## Findings` section with concrete, actionable items.## Plan Pass
## Problem
Fixer observed `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` in `pselect6`, but the retained evidence does not prove a Munin busy loop. The strace excerpt shows roughly 1.8s and 2.0s blocking timeouts, process state was sleeping, and sampled CPU was only 0.9%. `munin-node` enters `Net::Server::Fork` from `script/munin-node`; Munin’s request work is in `Munin::Node::Server`, while plugin child IO uses a separate blocking `select` in `Munin::Node::OS`.
## Evidence Confidence
observed
## Proposed Subject
No source patch yet: diagnose `munin-node` idle `pselect6` evidence before changing event-loop or timeout behavior.
## Patch Plan
Do not edit code unless an independent reproduction shows high CPU with rapid poll wakeups or a Perl-level stack tied to Munin code. The current evidence looks more like the normal `Net::Server::Fork` idle accept loop than runaway CPU.
If extra evidence does show a Munin-side loop, inspect the exact stack first and keep any change bounded to the implicated subsystem:
- `script/munin-node` server startup and foreground handling.
- `lib/Munin/Node/Server.pm` request loop, using existing `Munin::Common::Timeout`, `Munin::Common::Logger`, and `Munin::Common::Daemon` conventions.
- `lib/Munin/Node/OS.pm` only if plugin child pipe reading is actually implicated.
Follow `CONTRIBUTING.md` and `HACKING.pod`: strict/warnings Perl, taint-mode awareness, no avoidable awkward control flow such as a `goto`, file-local indentation style, and present-tense maintainer-facing explanation. No relevant local helper exists for the `Net::Server::Fork` idle accept loop itself; relevant local helpers found are `Munin::Common::Timeout`, `Munin::Common::Logger`, `Munin::Common::Daemon::emit_sd_notify_message`, and `Munin::Node::OS` process helpers.
No prior Fixer patch was found in this workspace to improve or replace.
## Risks
Changing idle polling or timeout behavior without reproduction would risk altering daemon responsiveness, request handling, or service-manager readiness semantics. Timing/throttling behavior is security-sensitive per the instructions, so a source patch is blocked until validation can reproduce the behavior and characterize the impact.
## Validation
Before any focused check, try project-level entrypoints from the workspace root: `make`, then `make check` if present; this Makefile appears to expose `make test` rather than `check`, so use `make test` as the project-level test command.
Bounded independent reproduction attempt before editing: run `munin-node` from the workspace with a temporary config and empty plugin directory under `timeout` plus `strace -ttT -f -e trace=pselect6,select,poll,ppoll` and sample `ps -o stat,pcpu,wchan,args`. Only claim reproduction if it shows rapid nonblocking poll/select wakeups with meaningful CPU; if it only shows ~2s sleeps like the evidence bundle, report no patch-ready Munin bug.
## Patch Pass
Subject: Diagnose munin-node idle select evidence
## Commit Message
No source change is included. The likely root cause of the collected signal is normal `munin-node` idle waiting in `Net::Server::Fork`, not a confirmed busy loop: the process was sleeping, `wchan` was a poll timeout path, CPU was 0.9%, and strace showed `pselect6` blocking for about two seconds.
## Evidence Confidence
observed
## Issue Connection
Fixer observed `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` with native frames under `select()`/`pselect6`, but this was not independently reproduced. The direct collected signal is a short perf/strace/proc snapshot; it does not include a Perl-level stack tying a tight loop to Munin code.
I inspected the interpreter entrypoint first (`script/munin-node`) and the relevant Munin node modules (`Munin::Node::Server`, `Munin::Node::OS`) rather than treating Perl itself as the target. `munin-node` hands its listener loop to `Net::Server::Fork`; Munin’s local helpers around this area are `Munin::Common::Timeout`, `Munin::Common::Logger`, `Munin::Common::Daemon::emit_sd_notify_message`, and `Munin::Node::OS` process helpers. I found no Munin wrapper for the `Net::Server::Fork` idle accept loop itself.
Following the saved plan, I did not leave a source diff. Any attempted fix here would change timing/listener behavior based on a signal that looks like normal blocking idle wait, and timing/throttling changes require reproduced evidence plus impact analysis.
## Git Add Paths
None
## Validation
`make` from the workspace root failed before building because `Module::Build` is missing:
`Can't locate Module/Build.pm in @INC ... at Build.PL line 80. BEGIN failed--compilation aborted ... make: *** [Makefile:149: Build] Error 2`.
`make -n check` failed because this Makefile has no `check` target:
`make: *** No rule to make target 'check'. Stop.`
`make test` hit the same `Module::Build` blocker as `make`.
Focused checks:
`perl -T -Ilib -c lib/Munin/Node/Server.pm` passed.
`perl -T -Ilib -c script/munin-node` passed.
`perl -T -Ilib -c lib/Munin/Node/OS.pm` reported redefinition warnings, then `syntax OK`.
Independent reproduction attempt:
`timeout 7s strace -ttT -f -e trace=pselect6,select,poll,ppoll perl -T -Ilib script/munin-node --foreground ...` was blocked by sandbox ptrace restrictions: `PTRACE_TRACEME: Operation not permitted`.
A non-strace foreground smoke with a temporary config also could not bind a local TCP listener in this sandbox:
`Cannot bind and listen to TCP port 14949 on 127.0.0.1 [Operation not permitted]`.
I therefore could not reproduce the claimed busy poll locally, and left no patch.
## Review Pass 1
RESULT: ok
No source changes are present in the workspace; `git diff` is empty and a direct comparison against the original snapshot only shows workspace metadata directories (`.git`, `.agents`, `.codex`). The no-patch diagnosis is appropriate for the evidence level.
The author response includes the required sections, uses a valid `observed` confidence label, avoids claiming local reproduction, and explains why a timing/listener change would be unsafe without stronger evidence. It also documents the relevant Munin conventions and helpers (`Munin::Common::Timeout`, `Munin::Common::Logger`, `Munin::Common::Daemon::emit_sd_notify_message`, `Munin::Node::OS`) and correctly treats the Perl script entrypoint before considering the runtime.
Validation is acceptable for a no-patch pass: `make` and `make test` were attempted and blocked by missing `Module::Build`, `make check` was checked and found unavailable, focused taint-mode syntax checks were run, and the independent reproduction attempt was blocked by sandbox ptrace/network restrictions rather than omitted.perl likely remains stuck in a busy-poll loop. A diagnosis report and patch proposal were created locally.
## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.
## Patch Pass
You are working on a bounded fixer proposal.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Produce the smallest reasonable patch for the target repository, keep the change upstreamable, prefer the clearest control flow available, and do not keep avoidable `goto` when a simpler structure would read better. Before introducing new file, process, allocation, locking, networking, or platform APIs, inspect nearby code and project contribution docs for existing helpers or compatibility wrappers and use those local patterns unless you can explain why they do not fit. Validate from a reproducible workspace-root entrypoint before falling back to focused leaf commands; if a build or test cannot run, report the exact command, the exact blocker, and any narrower check you ran instead. During validation, also try one bounded independent reproduction of the collected failure signal when it is safe and cheap, such as a failing test, smoke command, perf/strace comparison, or before/after runtime check. Only use `reproduced` if that command or test actually reproduced the failure; otherwise keep `observed` and report the reproduction blocker. The final explanation must connect the observed issue evidence to the actual code change, not just paraphrase the diff. Write like a maintainer is going to read the patch mail cold: explain the bug in plain language, define subsystem-specific jargon the first time you need it, and make the causal story obvious. Explicitly classify evidence confidence as `reproduced`, `observed`, or `inferred`: `reproduced` means you reproduced the failure locally; `observed` means Fixer has direct crash/log/trace evidence but you did not independently reproduce it; `inferred` means the source patch is not pull-request-ready, so do not leave a source diff unless you first gather stronger observed/reproduced evidence; otherwise return a no-patch diagnosis/report. For any source-changing `observed` patch, say explicitly in `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. Security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior need reproduced evidence plus explicit security-impact analysis before leaving a source diff; otherwise return a no-patch diagnosis/report for human review. If you introduce non-obvious state translation, index remapping, or backend split logic, add a short source comment that explains the invariant being preserved.
Start by explaining the likely root cause from the collected perf, strace, and /proc evidence. If you cannot land a safe patch, leave a diagnosis that is strong enough for an upstream bug report.
Interpreter process expectation: when the hot process is Python, Perl, shell, Node, Ruby, PHP, Lua, or another interpreter, inspect both the runtime and the script/application entrypoint from `details.interpreter_process`. Prefer the script or application package when evidence points there; do not patch the interpreter runtime merely because the hot binary is `python`, `perl`, `bash`, or similar. Runtime fixes are welcome only after checking the entrypoint and explaining why the runtime mishandles the workload or why running bad code faster/safer is itself the right upstream fix.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Keep the change narrowly scoped and summarize validation clearly.
In every authoring pass, your final response must start with `Subject: <single-line git commit subject>` and then include these markdown sections exactly:
## Commit Message
A short upstream-friendly explanation of what changed and why. Write it in plain language that a maintainer can follow without local complaint context. If you use subsystem jargon, define it immediately.
## Evidence Confidence
Exactly one word: `reproduced`, `observed`, or `inferred`. Use `reproduced` only when you reproduced the failure locally with a command or test, and include that command/test in `## Validation`. Use `observed` when Fixer has direct crash/log/trace evidence but you did not independently reproduce it. If `## Git Add Paths` lists source files for an `observed` patch, `## Issue Connection` must explicitly say the failure was observed by Fixer and not independently reproduced. Security-sensitive source changes touching authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior require reproduced evidence and explicit security-impact analysis; otherwise list `None` under `## Git Add Paths` and write a no-patch diagnosis/report. Use `inferred` for profiler/strace/indirect evidence; inferred responses may be no-patch diagnoses or reports, but inferred source patches are not pull-request-ready until stronger evidence is gathered.
## Issue Connection
Write this as maintainer-facing patch mail, not as local Fixer notes. Cover four things explicitly in readable sentences: the user-visible symptom or the exact collected signal, the code-level cause or the cautious inference from evidence, the specific change you made, and the expected effect. Do not invent a reproducer, command line, crash, or user-visible failure that is not present in the evidence bundle. If the evidence is direct-but-not-reproduced, say it was observed by Fixer and not independently reproduced. If the evidence is indirect and you did not gather stronger evidence, do not leave a source diff; write a no-patch diagnosis/report instead. Include an explicit effect sentence such as `The expected effect is ...`, `This should reduce ...`, or `This prevents ...` for source patches. If the logic is non-obvious in code, mention that you added a short explanatory comment.
## Git Add Paths
List the repo-relative paths that belong in the final patch, one per line. Use `None` only when you intentionally made no source changes. Include intentionally new files, and do not list generated build artifacts.
## Validation
List the checks you ran, or say clearly that you could not run them. Include the independent reproduction command/test and result when `## Evidence Confidence` is `reproduced`; if reproduction was attempted but blocked, name the exact blocker and keep confidence at `observed` or `inferred`.
Before editing, read the plan at `./plan-output.txt` and follow it unless the code proves part of it wrong. If you change course, say so explicitly in the final write-up instead of silently drifting from the plan.
## Review Pass 1
You are reviewing a freshly generated fixer patch.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Review the first patch pass. The original pre-edit snapshot is available at `./source` for diffing.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout. The latest author response is at `./patch-output.txt`. Inspect the current code and changed paths like a strict code reviewer. Focus on correctness, regressions, maintainability, awkward control flow such as avoidable `goto`, missing validation, weak or non-gittable commit message text, and explanations that fail to connect the observed issue evidence to the code change. Also review the maintainer experience: the patch mail should be easy to accept upstream, the user-visible bug should be explained in plain language, subsystem-specific jargon should be defined when first used, and any non-obvious state translation or index remapping in code should have a short explanatory comment. Reject patches that omit `## Evidence Confidence`, use anything other than `reproduced`, `observed`, or `inferred`, or sound more certain than that evidence level allows. Reject patches that claim `reproduced` unless `## Validation` names the concrete reproduction command or test and its result. Reject source patches in security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior unless the author reproduced the behavior and explicitly analyzed the security impact of the change; observed-only evidence should become a diagnosis/report, not a PR-ready source diff. Reject patches that invent a reproducer, command line, crash, or user-visible failure not present in the evidence bundle; indirect profiler or strace evidence may justify a cautious mitigation, but the author must say it is indirect instead of presenting it as a confirmed upstream bug. Reject patches that introduce generic libc/std APIs when nearby code or project docs provide a local compat/helper API for the same job, unless the author explicitly justifies the exception. Reject validation that only reports a leaf object/syntax build when a project-level configure/build/test entrypoint exists and was not attempted; if a full build cannot run, the author must show the exact failed command and blocker.
Do not apply code changes in this pass.
Return a short markdown review report. The first non-empty line must be exactly one of:
RESULT: ok
RESULT: fix-needed
If you choose `RESULT: fix-needed`, add a `## Findings` section with concrete, actionable items.## Plan Pass
## Problem
Fixer observed `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` in `pselect6`, but the retained evidence does not prove a Munin busy loop. The strace excerpt shows roughly 1.8s and 2.0s blocking timeouts, process state was sleeping, and sampled CPU was only 0.9%. `munin-node` enters `Net::Server::Fork` from `script/munin-node`; Munin’s request work is in `Munin::Node::Server`, while plugin child IO uses a separate blocking `select` in `Munin::Node::OS`.
## Evidence Confidence
observed
## Proposed Subject
No source patch yet: diagnose `munin-node` idle `pselect6` evidence before changing event-loop or timeout behavior.
## Patch Plan
Do not edit code unless an independent reproduction shows high CPU with rapid poll wakeups or a Perl-level stack tied to Munin code. The current evidence looks more like the normal `Net::Server::Fork` idle accept loop than runaway CPU.
If extra evidence does show a Munin-side loop, inspect the exact stack first and keep any change bounded to the implicated subsystem:
- `script/munin-node` server startup and foreground handling.
- `lib/Munin/Node/Server.pm` request loop, using existing `Munin::Common::Timeout`, `Munin::Common::Logger`, and `Munin::Common::Daemon` conventions.
- `lib/Munin/Node/OS.pm` only if plugin child pipe reading is actually implicated.
Follow `CONTRIBUTING.md` and `HACKING.pod`: strict/warnings Perl, taint-mode awareness, no avoidable awkward control flow such as a `goto`, file-local indentation style, and present-tense maintainer-facing explanation. No relevant local helper exists for the `Net::Server::Fork` idle accept loop itself; relevant local helpers found are `Munin::Common::Timeout`, `Munin::Common::Logger`, `Munin::Common::Daemon::emit_sd_notify_message`, and `Munin::Node::OS` process helpers.
No prior Fixer patch was found in this workspace to improve or replace.
## Risks
Changing idle polling or timeout behavior without reproduction would risk altering daemon responsiveness, request handling, or service-manager readiness semantics. Timing/throttling behavior is security-sensitive per the instructions, so a source patch is blocked until validation can reproduce the behavior and characterize the impact.
## Validation
Before any focused check, try project-level entrypoints from the workspace root: `make`, then `make check` if present; this Makefile appears to expose `make test` rather than `check`, so use `make test` as the project-level test command.
Bounded independent reproduction attempt before editing: run `munin-node` from the workspace with a temporary config and empty plugin directory under `timeout` plus `strace -ttT -f -e trace=pselect6,select,poll,ppoll` and sample `ps -o stat,pcpu,wchan,args`. Only claim reproduction if it shows rapid nonblocking poll/select wakeups with meaningful CPU; if it only shows ~2s sleeps like the evidence bundle, report no patch-ready Munin bug.
## Patch Pass
Subject: Diagnose munin-node idle select evidence
## Commit Message
No source change is included. The likely root cause of the collected signal is normal `munin-node` idle waiting in `Net::Server::Fork`, not a confirmed busy loop: the process was sleeping, `wchan` was a poll timeout path, CPU was 0.9%, and strace showed `pselect6` blocking for about two seconds.
## Evidence Confidence
observed
## Issue Connection
Fixer observed `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` with native frames under `select()`/`pselect6`, but this was not independently reproduced. The direct collected signal is a short perf/strace/proc snapshot; it does not include a Perl-level stack tying a tight loop to Munin code.
I inspected the interpreter entrypoint first (`script/munin-node`) and the relevant Munin node modules (`Munin::Node::Server`, `Munin::Node::OS`) rather than treating Perl itself as the target. `munin-node` hands its listener loop to `Net::Server::Fork`; Munin’s local helpers around this area are `Munin::Common::Timeout`, `Munin::Common::Logger`, `Munin::Common::Daemon::emit_sd_notify_message`, and `Munin::Node::OS` process helpers. I found no Munin wrapper for the `Net::Server::Fork` idle accept loop itself.
Following the saved plan, I did not leave a source diff. Any attempted fix here would change timing/listener behavior based on a signal that looks like normal blocking idle wait, and timing/throttling changes require reproduced evidence plus impact analysis.
## Git Add Paths
None
## Validation
`make` from the workspace root failed before building because `Module::Build` is missing:
`Can't locate Module/Build.pm in @INC ... at Build.PL line 80. BEGIN failed--compilation aborted ... make: *** [Makefile:149: Build] Error 2`.
`make -n check` failed because this Makefile has no `check` target:
`make: *** No rule to make target 'check'. Stop.`
`make test` hit the same `Module::Build` blocker as `make`.
Focused checks:
`perl -T -Ilib -c lib/Munin/Node/Server.pm` passed.
`perl -T -Ilib -c script/munin-node` passed.
`perl -T -Ilib -c lib/Munin/Node/OS.pm` reported redefinition warnings, then `syntax OK`.
Independent reproduction attempt:
`timeout 7s strace -ttT -f -e trace=pselect6,select,poll,ppoll perl -T -Ilib script/munin-node --foreground ...` was blocked by sandbox ptrace restrictions: `PTRACE_TRACEME: Operation not permitted`.
A non-strace foreground smoke with a temporary config also could not bind a local TCP listener in this sandbox:
`Cannot bind and listen to TCP port 14949 on 127.0.0.1 [Operation not permitted]`.
I therefore could not reproduce the claimed busy poll locally, and left no patch.
## Review Pass 1
RESULT: ok
No source changes are present in the workspace; `git diff` is empty and a direct comparison against the original snapshot only shows workspace metadata directories (`.git`, `.agents`, `.codex`). The no-patch diagnosis is appropriate for the evidence level.
The author response includes the required sections, uses a valid `observed` confidence label, avoids claiming local reproduction, and explains why a timing/listener change would be unsafe without stronger evidence. It also documents the relevant Munin conventions and helpers (`Munin::Common::Timeout`, `Munin::Common::Logger`, `Munin::Common::Daemon::emit_sd_notify_message`, `Munin::Node::OS`) and correctly treats the Perl script entrypoint before considering the runtime.
Validation is acceptable for a no-patch pass: `make` and `make test` were attempted and blocked by missing `Module::Build`, `make check` was checked and found unavailable, focused taint-mode syntax checks were run, and the independent reproduction attempt was blocked by sandbox ptrace/network restrictions rather than omitted.perl likely remains stuck in a busy-poll loop. A diagnosis report and patch proposal were created locally.
## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.
## Patch Pass
You are working on a bounded fixer proposal.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Produce the smallest reasonable patch for the target repository, keep the change upstreamable, prefer the clearest control flow available, and do not keep avoidable `goto` when a simpler structure would read better. Before introducing new file, process, allocation, locking, networking, or platform APIs, inspect nearby code and project contribution docs for existing helpers or compatibility wrappers and use those local patterns unless you can explain why they do not fit. Validate from a reproducible workspace-root entrypoint before falling back to focused leaf commands; if a build or test cannot run, report the exact command, the exact blocker, and any narrower check you ran instead. During validation, also try one bounded independent reproduction of the collected failure signal when it is safe and cheap, such as a failing test, smoke command, perf/strace comparison, or before/after runtime check. Only use `reproduced` if that command or test actually reproduced the failure; otherwise keep `observed` and report the reproduction blocker. The final explanation must connect the observed issue evidence to the actual code change, not just paraphrase the diff. Write like a maintainer is going to read the patch mail cold: explain the bug in plain language, define subsystem-specific jargon the first time you need it, and make the causal story obvious. Explicitly classify evidence confidence as `reproduced`, `observed`, or `inferred`: `reproduced` means you reproduced the failure locally; `observed` means Fixer has direct crash/log/trace evidence but you did not independently reproduce it; `inferred` means the source patch is not pull-request-ready, so do not leave a source diff unless you first gather stronger observed/reproduced evidence; otherwise return a no-patch diagnosis/report. For any source-changing `observed` patch, say explicitly in `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. Security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior need reproduced evidence plus explicit security-impact analysis before leaving a source diff; otherwise return a no-patch diagnosis/report for human review. If you introduce non-obvious state translation, index remapping, or backend split logic, add a short source comment that explains the invariant being preserved.
Start by explaining the likely root cause from the collected perf, strace, and /proc evidence. If you cannot land a safe patch, leave a diagnosis that is strong enough for an upstream bug report.
Interpreter process expectation: when the hot process is Python, Perl, shell, Node, Ruby, PHP, Lua, or another interpreter, inspect both the runtime and the script/application entrypoint from `details.interpreter_process`. Prefer the script or application package when evidence points there; do not patch the interpreter runtime merely because the hot binary is `python`, `perl`, `bash`, or similar. Runtime fixes are welcome only after checking the entrypoint and explaining why the runtime mishandles the workload or why running bad code faster/safer is itself the right upstream fix.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Keep the change narrowly scoped and summarize validation clearly.
In every authoring pass, your final response must start with `Subject: <single-line git commit subject>` and then include these markdown sections exactly:
## Commit Message
A short upstream-friendly explanation of what changed and why. Write it in plain language that a maintainer can follow without local complaint context. If you use subsystem jargon, define it immediately.
## Evidence Confidence
Exactly one word: `reproduced`, `observed`, or `inferred`. Use `reproduced` only when you reproduced the failure locally with a command or test, and include that command/test in `## Validation`. Use `observed` when Fixer has direct crash/log/trace evidence but you did not independently reproduce it. If `## Git Add Paths` lists source files for an `observed` patch, `## Issue Connection` must explicitly say the failure was observed by Fixer and not independently reproduced. Security-sensitive source changes touching authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior require reproduced evidence and explicit security-impact analysis; otherwise list `None` under `## Git Add Paths` and write a no-patch diagnosis/report. Use `inferred` for profiler/strace/indirect evidence; inferred responses may be no-patch diagnoses or reports, but inferred source patches are not pull-request-ready until stronger evidence is gathered.
## Issue Connection
Write this as maintainer-facing patch mail, not as local Fixer notes. Cover four things explicitly in readable sentences: the user-visible symptom or the exact collected signal, the code-level cause or the cautious inference from evidence, the specific change you made, and the expected effect. Do not invent a reproducer, command line, crash, or user-visible failure that is not present in the evidence bundle. If the evidence is direct-but-not-reproduced, say it was observed by Fixer and not independently reproduced. If the evidence is indirect and you did not gather stronger evidence, do not leave a source diff; write a no-patch diagnosis/report instead. Include an explicit effect sentence such as `The expected effect is ...`, `This should reduce ...`, or `This prevents ...` for source patches. If the logic is non-obvious in code, mention that you added a short explanatory comment.
## Git Add Paths
List the repo-relative paths that belong in the final patch, one per line. Use `None` only when you intentionally made no source changes. Include intentionally new files, and do not list generated build artifacts.
## Validation
List the checks you ran, or say clearly that you could not run them. Include the independent reproduction command/test and result when `## Evidence Confidence` is `reproduced`; if reproduction was attempted but blocked, name the exact blocker and keep confidence at `observed` or `inferred`.
Before editing, read the plan at `./plan-output.txt` and follow it unless the code proves part of it wrong. If you change course, say so explicitly in the final write-up instead of silently drifting from the plan.
## Review Pass 1
You are reviewing a freshly generated fixer patch.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Review the first patch pass. The original pre-edit snapshot is available at `./source` for diffing.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout. The latest author response is at `./patch-output.txt`. Inspect the current code and changed paths like a strict code reviewer. Focus on correctness, regressions, maintainability, awkward control flow such as avoidable `goto`, missing validation, weak or non-gittable commit message text, and explanations that fail to connect the observed issue evidence to the code change. Also review the maintainer experience: the patch mail should be easy to accept upstream, the user-visible bug should be explained in plain language, subsystem-specific jargon should be defined when first used, and any non-obvious state translation or index remapping in code should have a short explanatory comment. Reject patches that omit `## Evidence Confidence`, use anything other than `reproduced`, `observed`, or `inferred`, or sound more certain than that evidence level allows. Reject patches that claim `reproduced` unless `## Validation` names the concrete reproduction command or test and its result. Reject source patches in security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior unless the author reproduced the behavior and explicitly analyzed the security impact of the change; observed-only evidence should become a diagnosis/report, not a PR-ready source diff. Reject patches that invent a reproducer, command line, crash, or user-visible failure not present in the evidence bundle; indirect profiler or strace evidence may justify a cautious mitigation, but the author must say it is indirect instead of presenting it as a confirmed upstream bug. Reject patches that introduce generic libc/std APIs when nearby code or project docs provide a local compat/helper API for the same job, unless the author explicitly justifies the exception. Reject validation that only reports a leaf object/syntax build when a project-level configure/build/test entrypoint exists and was not attempted; if a full build cannot run, the author must show the exact failed command and blocker.
Do not apply code changes in this pass.
Return a short markdown review report. The first non-empty line must be exactly one of:
RESULT: ok
RESULT: fix-needed
If you choose `RESULT: fix-needed`, add a `## Findings` section with concrete, actionable items.## Plan Pass
## Problem
Fixer observed `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` in a poll-family syscall loop, but the retained evidence does not prove runaway CPU in Munin code. The strace excerpt shows `pselect6` timing out after ~1.8s and ~2.0s, process state is `S (sleeping)`, `wchan` is `poll_schedule_timeout`, and sampled CPU was only 0.9%.
## Evidence Confidence
observed
## Proposed Subject
No source patch: treat the report as an idle `munin-node`/`Net::Server::Fork` wait observation, not a confirmed Munin busy-loop bug.
## Patch Plan
Do not edit files in this pass. The entrypoint `script/munin-node` delegates the accept loop to `Munin::Node::Server`, which subclasses `Net::Server::Fork`; nearby Munin helpers are `Munin::Common::Timeout` for bounded request/plugin work and `Munin::Node::OS->_read_from_child` for plugin pipe `select`, but the evidence points at the server idle wait, not those helpers.
A PR-ready source patch would need extra evidence first: a Perl-level stack, a live strace showing rapid zero-duration polling, or a bounded reproduction with elevated CPU tied to Munin code. Without that, changing timeouts or server control flow would be speculative. No prior Fixer patch is present to improve or replace, and no awkward `goto`-style control flow change should be introduced.
## Risks
Patching based on this evidence could regress normal daemon responsiveness or Net::Server behavior while “fixing” expected idle waiting. The evidence was collected from an interpreter process and lacks a Perl stack, so a runtime or dependency behavior cannot be ruled in, but the script entrypoint remains the first investigation target.
## Validation
Project-level entrypoint tried from workspace root: `make`. It failed before building because `Module::Build` is missing: `Can't locate Module/Build.pm in @INC ... at Build.PL line 80`, then `make: *** [Makefile:149: Build] Error 2`.
`make check` is not available: `No rule to make target 'check'`.
Focused check tried: `perl -T -Ilib -c script/munin-node`, which reported `script/munin-node syntax OK`, but it used the installed `Munin::Common::Defaults` because generated `lib/Munin/Common/Defaults.pm` is absent before build.
Bounded follow-up reproduction, before any patch: run `munin-node --foreground` under `timeout` and `strace` for poll syscalls, and only call it reproduced if it shows rapid non-blocking `pselect6` plus elevated CPU. Current evidence does not show that.
## Patch Pass
Subject: Diagnose munin-node idle poll evidence
## Commit Message
No source change is included. The collected evidence points to `munin-node` idling in the `Net::Server::Fork` accept loop, not to a confirmed Munin busy loop. A patch would need a Perl-level stack or a local reproduction showing rapid non-blocking polling with elevated CPU.
## Evidence Confidence
inferred
## Issue Connection
Fixer collected perf, strace, and `/proc` evidence for `/usr/bin/perl -wT /usr/sbin/munin-node --foreground`. The key signal was repeated `pselect6`, but the recorded calls blocked for about 1.8 to 2.0 seconds, `/proc` reported state `S (sleeping)`, `wchan` was `poll_schedule_timeout`, and CPU was about 0.9%.
The likely root cause is a false-positive “busy poll” classification of normal daemon idle waiting. `script/munin-node` hands server execution to `Munin::Node::Server`, which subclasses `Net::Server::Fork`; request work is separately bounded with `Munin::Common::Timeout`, and plugin child IO uses `Munin::Node::OS`. I did not find evidence tying the sampled wait to a Munin application loop or to a Perl runtime bug.
I followed the saved plan’s no-patch direction. I changed only the confidence label from the plan’s `observed` to `inferred` because this authoring pass explicitly treats profiler/strace-only evidence as indirect unless a failure is independently reproduced. The expected effect is no upstream behavior change until stronger evidence identifies a real code-level defect.
## Git Add Paths
None
## Validation
`make` from the workspace root failed before building:
`Can't locate Module/Build.pm in @INC ... at Build.PL line 80`
then:
`make: *** [Makefile:149: Build] Error 2`
`make check` is not available:
`make: *** No rule to make target 'check'. Stop.`
Focused syntax check:
`perl -T -Ilib -c script/munin-node`
reported:
`script/munin-node syntax OK`
This was limited because generated `lib/Munin/Common/Defaults.pm` is absent before a successful build, so Perl used the installed Munin defaults module.
Independent reproduction attempt:
`strace` smoke tracing was blocked by sandbox ptrace restrictions:
`PTRACE_TRACEME: Operation not permitted`.
A foreground `munin-node` smoke run with temporary empty plugin/config directories was also blocked before idle sampling because binding a high localhost TCP port failed:
`Cannot bind and listen to TCP port 14949 on 127.0.0.1 [Operation not permitted]`.
No failure was locally reproduced.
## Review Pass 1
RESULT: ok
No source changes are present in the workspace, and the no-patch diagnosis is appropriate for the evidence level. The author did not overclaim reproduction, used a valid `## Evidence Confidence` value, and kept `## Git Add Paths` as `None`.
The write-up connects the collected `pselect6`, sleeping state, `wchan`, and low CPU evidence to the cautious conclusion that this is likely normal `munin-node` idle waiting through `Net::Server::Fork`, not a confirmed Munin busy loop. It also names relevant local helpers and conventions: `Munin::Common::Timeout`, `Munin::Node::OS`, and the `Net::Server::Fork` subsystem.
Validation is acceptable for a no-patch report: `make` was attempted and failed on missing `Module::Build`, `make check` was attempted and is not a target, a focused taint-mode syntax check was run, and independent reproduction attempts were reported with concrete sandbox blockers.perl likely remains stuck in a busy-poll loop. A diagnosis report and patch proposal were created locally.
## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.
## Patch Pass
You are working on a bounded fixer proposal.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Produce the smallest reasonable patch for the target repository, keep the change upstreamable, prefer the clearest control flow available, and do not keep avoidable `goto` when a simpler structure would read better. Before introducing new file, process, allocation, locking, networking, or platform APIs, inspect nearby code and project contribution docs for existing helpers or compatibility wrappers and use those local patterns unless you can explain why they do not fit. Validate from a reproducible workspace-root entrypoint before falling back to focused leaf commands; if a build or test cannot run, report the exact command, the exact blocker, and any narrower check you ran instead. During validation, also try one bounded independent reproduction of the collected failure signal when it is safe and cheap, such as a failing test, smoke command, perf/strace comparison, or before/after runtime check. Only use `reproduced` if that command or test actually reproduced the failure; otherwise keep `observed` and report the reproduction blocker. The final explanation must connect the observed issue evidence to the actual code change, not just paraphrase the diff. Write like a maintainer is going to read the patch mail cold: explain the bug in plain language, define subsystem-specific jargon the first time you need it, and make the causal story obvious. Explicitly classify evidence confidence as `reproduced`, `observed`, or `inferred`: `reproduced` means you reproduced the failure locally; `observed` means Fixer has direct crash/log/trace evidence but you did not independently reproduce it; `inferred` means the source patch is not pull-request-ready, so do not leave a source diff unless you first gather stronger observed/reproduced evidence; otherwise return a no-patch diagnosis/report. For any source-changing `observed` patch, say explicitly in `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. Security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior need reproduced evidence plus explicit security-impact analysis before leaving a source diff; otherwise return a no-patch diagnosis/report for human review. If you introduce non-obvious state translation, index remapping, or backend split logic, add a short source comment that explains the invariant being preserved.
Start by explaining the likely root cause from the collected perf, strace, and /proc evidence. If you cannot land a safe patch, leave a diagnosis that is strong enough for an upstream bug report.
Interpreter process expectation: when the hot process is Python, Perl, shell, Node, Ruby, PHP, Lua, or another interpreter, inspect both the runtime and the script/application entrypoint from `details.interpreter_process`. Prefer the script or application package when evidence points there; do not patch the interpreter runtime merely because the hot binary is `python`, `perl`, `bash`, or similar. Runtime fixes are welcome only after checking the entrypoint and explaining why the runtime mishandles the workload or why running bad code faster/safer is itself the right upstream fix.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Keep the change narrowly scoped and summarize validation clearly.
In every authoring pass, your final response must start with `Subject: <single-line git commit subject>` and then include these markdown sections exactly:
## Commit Message
A short upstream-friendly explanation of what changed and why. Write it in plain language that a maintainer can follow without local complaint context. If you use subsystem jargon, define it immediately.
## Evidence Confidence
Exactly one word: `reproduced`, `observed`, or `inferred`. Use `reproduced` only when you reproduced the failure locally with a command or test, and include that command/test in `## Validation`. Use `observed` when Fixer has direct crash/log/trace evidence but you did not independently reproduce it. If `## Git Add Paths` lists source files for an `observed` patch, `## Issue Connection` must explicitly say the failure was observed by Fixer and not independently reproduced. Security-sensitive source changes touching authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior require reproduced evidence and explicit security-impact analysis; otherwise list `None` under `## Git Add Paths` and write a no-patch diagnosis/report. Use `inferred` for profiler/strace/indirect evidence; inferred responses may be no-patch diagnoses or reports, but inferred source patches are not pull-request-ready until stronger evidence is gathered.
## Issue Connection
Write this as maintainer-facing patch mail, not as local Fixer notes. Cover four things explicitly in readable sentences: the user-visible symptom or the exact collected signal, the code-level cause or the cautious inference from evidence, the specific change you made, and the expected effect. Do not invent a reproducer, command line, crash, or user-visible failure that is not present in the evidence bundle. If the evidence is direct-but-not-reproduced, say it was observed by Fixer and not independently reproduced. If the evidence is indirect and you did not gather stronger evidence, do not leave a source diff; write a no-patch diagnosis/report instead. Include an explicit effect sentence such as `The expected effect is ...`, `This should reduce ...`, or `This prevents ...` for source patches. If the logic is non-obvious in code, mention that you added a short explanatory comment.
## Git Add Paths
List the repo-relative paths that belong in the final patch, one per line. Use `None` only when you intentionally made no source changes. Include intentionally new files, and do not list generated build artifacts.
## Validation
List the checks you ran, or say clearly that you could not run them. Include the independent reproduction command/test and result when `## Evidence Confidence` is `reproduced`; if reproduction was attempted but blocked, name the exact blocker and keep confidence at `observed` or `inferred`.
Before editing, read the plan at `./plan-output.txt` and follow it unless the code proves part of it wrong. If you change course, say so explicitly in the final write-up instead of silently drifting from the plan.
## Review Pass 1
You are reviewing a freshly generated fixer patch.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Review the first patch pass. The original pre-edit snapshot is available at `./source` for diffing.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout. The latest author response is at `./patch-output.txt`. Inspect the current code and changed paths like a strict code reviewer. Focus on correctness, regressions, maintainability, awkward control flow such as avoidable `goto`, missing validation, weak or non-gittable commit message text, and explanations that fail to connect the observed issue evidence to the code change. Also review the maintainer experience: the patch mail should be easy to accept upstream, the user-visible bug should be explained in plain language, subsystem-specific jargon should be defined when first used, and any non-obvious state translation or index remapping in code should have a short explanatory comment. Reject patches that omit `## Evidence Confidence`, use anything other than `reproduced`, `observed`, or `inferred`, or sound more certain than that evidence level allows. Reject patches that claim `reproduced` unless `## Validation` names the concrete reproduction command or test and its result. Reject source patches in security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior unless the author reproduced the behavior and explicitly analyzed the security impact of the change; observed-only evidence should become a diagnosis/report, not a PR-ready source diff. Reject patches that invent a reproducer, command line, crash, or user-visible failure not present in the evidence bundle; indirect profiler or strace evidence may justify a cautious mitigation, but the author must say it is indirect instead of presenting it as a confirmed upstream bug. Reject patches that introduce generic libc/std APIs when nearby code or project docs provide a local compat/helper API for the same job, unless the author explicitly justifies the exception. Reject validation that only reports a leaf object/syntax build when a project-level configure/build/test entrypoint exists and was not attempted; if a full build cannot run, the author must show the exact failed command and blocker.
Do not apply code changes in this pass.
Return a short markdown review report. The first non-empty line must be exactly one of:
RESULT: ok
RESULT: fix-needed
If you choose `RESULT: fix-needed`, add a `## Findings` section with concrete, actionable items.## Plan Pass
## Problem
Fixer observed `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` in a poll-family syscall loop, but the retained evidence does not prove runaway CPU in Munin code. The strace excerpt shows `pselect6` timing out after ~1.8s and ~2.0s, process state is `S (sleeping)`, `wchan` is `poll_schedule_timeout`, and sampled CPU was only 0.9%.
## Evidence Confidence
observed
## Proposed Subject
No source patch: treat the report as an idle `munin-node`/`Net::Server::Fork` wait observation, not a confirmed Munin busy-loop bug.
## Patch Plan
Do not edit files in this pass. The entrypoint `script/munin-node` delegates the accept loop to `Munin::Node::Server`, which subclasses `Net::Server::Fork`; nearby Munin helpers are `Munin::Common::Timeout` for bounded request/plugin work and `Munin::Node::OS->_read_from_child` for plugin pipe `select`, but the evidence points at the server idle wait, not those helpers.
A PR-ready source patch would need extra evidence first: a Perl-level stack, a live strace showing rapid zero-duration polling, or a bounded reproduction with elevated CPU tied to Munin code. Without that, changing timeouts or server control flow would be speculative. No prior Fixer patch is present to improve or replace, and no awkward `goto`-style control flow change should be introduced.
## Risks
Patching based on this evidence could regress normal daemon responsiveness or Net::Server behavior while “fixing” expected idle waiting. The evidence was collected from an interpreter process and lacks a Perl stack, so a runtime or dependency behavior cannot be ruled in, but the script entrypoint remains the first investigation target.
## Validation
Project-level entrypoint tried from workspace root: `make`. It failed before building because `Module::Build` is missing: `Can't locate Module/Build.pm in @INC ... at Build.PL line 80`, then `make: *** [Makefile:149: Build] Error 2`.
`make check` is not available: `No rule to make target 'check'`.
Focused check tried: `perl -T -Ilib -c script/munin-node`, which reported `script/munin-node syntax OK`, but it used the installed `Munin::Common::Defaults` because generated `lib/Munin/Common/Defaults.pm` is absent before build.
Bounded follow-up reproduction, before any patch: run `munin-node --foreground` under `timeout` and `strace` for poll syscalls, and only call it reproduced if it shows rapid non-blocking `pselect6` plus elevated CPU. Current evidence does not show that.
## Patch Pass
Subject: Diagnose munin-node idle poll evidence
## Commit Message
No source change is included. The collected evidence points to `munin-node` idling in the `Net::Server::Fork` accept loop, not to a confirmed Munin busy loop. A patch would need a Perl-level stack or a local reproduction showing rapid non-blocking polling with elevated CPU.
## Evidence Confidence
inferred
## Issue Connection
Fixer collected perf, strace, and `/proc` evidence for `/usr/bin/perl -wT /usr/sbin/munin-node --foreground`. The key signal was repeated `pselect6`, but the recorded calls blocked for about 1.8 to 2.0 seconds, `/proc` reported state `S (sleeping)`, `wchan` was `poll_schedule_timeout`, and CPU was about 0.9%.
The likely root cause is a false-positive “busy poll” classification of normal daemon idle waiting. `script/munin-node` hands server execution to `Munin::Node::Server`, which subclasses `Net::Server::Fork`; request work is separately bounded with `Munin::Common::Timeout`, and plugin child IO uses `Munin::Node::OS`. I did not find evidence tying the sampled wait to a Munin application loop or to a Perl runtime bug.
I followed the saved plan’s no-patch direction. I changed only the confidence label from the plan’s `observed` to `inferred` because this authoring pass explicitly treats profiler/strace-only evidence as indirect unless a failure is independently reproduced. The expected effect is no upstream behavior change until stronger evidence identifies a real code-level defect.
## Git Add Paths
None
## Validation
`make` from the workspace root failed before building:
`Can't locate Module/Build.pm in @INC ... at Build.PL line 80`
then:
`make: *** [Makefile:149: Build] Error 2`
`make check` is not available:
`make: *** No rule to make target 'check'. Stop.`
Focused syntax check:
`perl -T -Ilib -c script/munin-node`
reported:
`script/munin-node syntax OK`
This was limited because generated `lib/Munin/Common/Defaults.pm` is absent before a successful build, so Perl used the installed Munin defaults module.
Independent reproduction attempt:
`strace` smoke tracing was blocked by sandbox ptrace restrictions:
`PTRACE_TRACEME: Operation not permitted`.
A foreground `munin-node` smoke run with temporary empty plugin/config directories was also blocked before idle sampling because binding a high localhost TCP port failed:
`Cannot bind and listen to TCP port 14949 on 127.0.0.1 [Operation not permitted]`.
No failure was locally reproduced.
## Review Pass 1
RESULT: ok
No source changes are present in the workspace, and the no-patch diagnosis is appropriate for the evidence level. The author did not overclaim reproduction, used a valid `## Evidence Confidence` value, and kept `## Git Add Paths` as `None`.
The write-up connects the collected `pselect6`, sleeping state, `wchan`, and low CPU evidence to the cautious conclusion that this is likely normal `munin-node` idle waiting through `Net::Server::Fork`, not a confirmed Munin busy loop. It also names relevant local helpers and conventions: `Munin::Common::Timeout`, `Munin::Node::OS`, and the `Net::Server::Fork` subsystem.
Validation is acceptable for a no-patch report: `make` was attempted and failed on missing `Module::Build`, `make check` was attempted and is not a target, a focused taint-mode syntax check was run, and independent reproduction attempts were reported with concrete sandbox blockers.perl likely remains stuck in a busy-poll loop. A diagnosis report and patch proposal were created locally.
## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.
## Patch Pass
You are working on a bounded fixer proposal.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Produce the smallest reasonable patch for the target repository, keep the change upstreamable, prefer the clearest control flow available, and do not keep avoidable `goto` when a simpler structure would read better. Before introducing new file, process, allocation, locking, networking, or platform APIs, inspect nearby code and project contribution docs for existing helpers or compatibility wrappers and use those local patterns unless you can explain why they do not fit. Validate from a reproducible workspace-root entrypoint before falling back to focused leaf commands; if a build or test cannot run, report the exact command, the exact blocker, and any narrower check you ran instead. During validation, also try one bounded independent reproduction of the collected failure signal when it is safe and cheap, such as a failing test, smoke command, perf/strace comparison, or before/after runtime check. Only use `reproduced` if that command or test actually reproduced the failure; otherwise keep `observed` and report the reproduction blocker. The final explanation must connect the observed issue evidence to the actual code change, not just paraphrase the diff. Write like a maintainer is going to read the patch mail cold: explain the bug in plain language, define subsystem-specific jargon the first time you need it, and make the causal story obvious. Explicitly classify evidence confidence as `reproduced`, `observed`, or `inferred`: `reproduced` means you reproduced the failure locally; `observed` means Fixer has direct crash/log/trace evidence but you did not independently reproduce it; `inferred` means the source patch is not pull-request-ready, so do not leave a source diff unless you first gather stronger observed/reproduced evidence; otherwise return a no-patch diagnosis/report. For any source-changing `observed` patch, say explicitly in `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. Security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior need reproduced evidence plus explicit security-impact analysis before leaving a source diff; otherwise return a no-patch diagnosis/report for human review. If you introduce non-obvious state translation, index remapping, or backend split logic, add a short source comment that explains the invariant being preserved.
Start by explaining the likely root cause from the collected perf, strace, and /proc evidence. If you cannot land a safe patch, leave a diagnosis that is strong enough for an upstream bug report.
Interpreter process expectation: when the hot process is Python, Perl, shell, Node, Ruby, PHP, Lua, or another interpreter, inspect both the runtime and the script/application entrypoint from `details.interpreter_process`. Prefer the script or application package when evidence points there; do not patch the interpreter runtime merely because the hot binary is `python`, `perl`, `bash`, or similar. Runtime fixes are welcome only after checking the entrypoint and explaining why the runtime mishandles the workload or why running bad code faster/safer is itself the right upstream fix.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Keep the change narrowly scoped and summarize validation clearly.
In every authoring pass, your final response must start with `Subject: <single-line git commit subject>` and then include these markdown sections exactly:
## Commit Message
A short upstream-friendly explanation of what changed and why. Write it in plain language that a maintainer can follow without local complaint context. If you use subsystem jargon, define it immediately.
## Evidence Confidence
Exactly one word: `reproduced`, `observed`, or `inferred`. Use `reproduced` only when you reproduced the failure locally with a command or test, and include that command/test in `## Validation`. Use `observed` when Fixer has direct crash/log/trace evidence but you did not independently reproduce it. If `## Git Add Paths` lists source files for an `observed` patch, `## Issue Connection` must explicitly say the failure was observed by Fixer and not independently reproduced. Security-sensitive source changes touching authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior require reproduced evidence and explicit security-impact analysis; otherwise list `None` under `## Git Add Paths` and write a no-patch diagnosis/report. Use `inferred` for profiler/strace/indirect evidence; inferred responses may be no-patch diagnoses or reports, but inferred source patches are not pull-request-ready until stronger evidence is gathered.
## Issue Connection
Write this as maintainer-facing patch mail, not as local Fixer notes. Cover four things explicitly in readable sentences: the user-visible symptom or the exact collected signal, the code-level cause or the cautious inference from evidence, the specific change you made, and the expected effect. Do not invent a reproducer, command line, crash, or user-visible failure that is not present in the evidence bundle. If the evidence is direct-but-not-reproduced, say it was observed by Fixer and not independently reproduced. If the evidence is indirect and you did not gather stronger evidence, do not leave a source diff; write a no-patch diagnosis/report instead. Include an explicit effect sentence such as `The expected effect is ...`, `This should reduce ...`, or `This prevents ...` for source patches. If the logic is non-obvious in code, mention that you added a short explanatory comment.
## Git Add Paths
List the repo-relative paths that belong in the final patch, one per line. Use `None` only when you intentionally made no source changes. Include intentionally new files, and do not list generated build artifacts.
## Validation
List the checks you ran, or say clearly that you could not run them. Include the independent reproduction command/test and result when `## Evidence Confidence` is `reproduced`; if reproduction was attempted but blocked, name the exact blocker and keep confidence at `observed` or `inferred`.
Before editing, read the plan at `./plan-output.txt` and follow it unless the code proves part of it wrong. If you change course, say so explicitly in the final write-up instead of silently drifting from the plan.
## Review Pass 1
You are reviewing a freshly generated fixer patch.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Review the first patch pass. The original pre-edit snapshot is available at `./source` for diffing.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout. The latest author response is at `./patch-output.txt`. Inspect the current code and changed paths like a strict code reviewer. Focus on correctness, regressions, maintainability, awkward control flow such as avoidable `goto`, missing validation, weak or non-gittable commit message text, and explanations that fail to connect the observed issue evidence to the code change. Also review the maintainer experience: the patch mail should be easy to accept upstream, the user-visible bug should be explained in plain language, subsystem-specific jargon should be defined when first used, and any non-obvious state translation or index remapping in code should have a short explanatory comment. Reject patches that omit `## Evidence Confidence`, use anything other than `reproduced`, `observed`, or `inferred`, or sound more certain than that evidence level allows. Reject patches that claim `reproduced` unless `## Validation` names the concrete reproduction command or test and its result. Reject source patches in security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior unless the author reproduced the behavior and explicitly analyzed the security impact of the change; observed-only evidence should become a diagnosis/report, not a PR-ready source diff. Reject patches that invent a reproducer, command line, crash, or user-visible failure not present in the evidence bundle; indirect profiler or strace evidence may justify a cautious mitigation, but the author must say it is indirect instead of presenting it as a confirmed upstream bug. Reject patches that introduce generic libc/std APIs when nearby code or project docs provide a local compat/helper API for the same job, unless the author explicitly justifies the exception. Reject validation that only reports a leaf object/syntax build when a project-level configure/build/test entrypoint exists and was not attempted; if a full build cannot run, the author must show the exact failed command and blocker.
Do not apply code changes in this pass.
Return a short markdown review report. The first non-empty line must be exactly one of:
RESULT: ok
RESULT: fix-needed
If you choose `RESULT: fix-needed`, add a `## Findings` section with concrete, actionable items.## Plan Pass
## Problem
Fixer observed `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` in a poll-family syscall loop, but the retained evidence shows `pselect6` blocking for about 1.8-2.0 seconds, process state `S (sleeping)`, and only 0.9% CPU during the sample. There is no Perl-level stack tying the profiler signal to a Munin source line, so a Munin source patch is not justified yet.
## Evidence Confidence
inferred
## Proposed Subject
No source patch yet: document a diagnosis and collect entrypoint-level evidence for `munin-node` before changing Munin or Perl.
## Patch Plan
Do not edit files in this pass. The likely code path is `script/munin-node` -> `Munin::Node::Server` -> `Net::Server::Fork`, with Munin’s own per-request timeout handled by `Munin::Common::Timeout::do_with_timeout`. Local conventions found: `CONTRIBUTING.md` requires newline-terminated files, `HACKING.pod` asks for `strict`, `warnings`, taint-mode-aware Perl, local file style, and tests through `Build.PL`/`make test`.
Before any future patch, collect a bounded Perl/script-level trace showing whether `Net::Server::Fork` is waking too often, a Munin command loop is spinning, or the current evidence is just normal listener timeout behavior. If a real Munin issue is reproduced, patch the narrow Munin entrypoint/subsystem rather than Perl runtime first, using existing helpers such as `Munin::Common::Timeout`, `Munin::Common::Logger`, and existing `Net::Server` configuration flow. Avoid awkward control flow such as avoidable `goto`; use a bounded conditional/helper change instead.
No prior Fixer patch was found to improve or replace; workspace history only shows `Fixer baseline`.
## Risks
A source patch based only on this evidence would risk changing normal daemon wakeup behavior. The evidence may reflect expected `Net::Server::Fork` select timeouts, not runaway CPU. Listener timing changes could affect daemon responsiveness or shutdown/reload behavior, so they should only follow a reproduced high-wakeup/high-CPU signal.
## Validation
First try project-level validation from the workspace root: `make`. `make check` is not available (`No rule to make target 'check'`), so use the project’s documented test target `make test` if dependencies allow.
For bounded independent evidence collection, run `munin-node` from the script entrypoint in foreground with a temporary localhost/high-port config and capture `strace -ttT -f -e trace=pselect6,select,poll,ppoll,nanosleep` plus `ps -o pid,stat,pcpu,etime,wchan,args`. Only claim reproduction if that command shows rapid non-blocking poll wakeups or sustained CPU; otherwise report it as not reproduced and keep the no-patch diagnosis.
## Patch Pass
Subject: No patch: diagnose munin-node poll evidence
## Commit Message
No source change is proposed. The collected evidence points to `munin-node` sleeping in the `Net::Server::Fork` listener wait, not to a proven Munin busy loop. The saved plan was followed: inspect the Perl script entrypoint first, then avoid changing listener timing without reproduced evidence.
## Evidence Confidence
inferred
## Issue Connection
Fixer observed `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` with repeated poll-family syscalls and a native stack under `select()`. The same evidence also shows `pselect6` calls blocking for about 1.8-2.0 seconds, process state `S (sleeping)`, `wchan` in `poll_schedule_timeout`, and only 0.9% CPU. The likely root cause is therefore a profiler/classifier signal from sampling a normal blocking listener wait, not a demonstrated tight userspace loop.
The relevant code path is `script/munin-node` loading `Munin::Node::Server`, which subclasses `Net::Server::Fork`; Munin’s own per-request loop uses `Munin::Common::Timeout::do_with_timeout`, and plugin process handling uses `Munin::Node::OS->run_as_child`. I found no Munin-owned busy poll loop to patch safely. Local conventions from `CONTRIBUTING.md` and `HACKING.pod` are taint-mode-aware Perl with `strict`/`warnings`, local style, and `Build.PL`/`make test` validation.
Because the evidence remains indirect and local reproduction was blocked by sandbox restrictions, leaving a timing/throttling source diff would not be pull-request-ready. The expected effect is no code churn from a speculative fix; this diagnosis should be used as the upstream bug-report basis if stronger process-level traces can be collected on an unrestricted host.
## Git Add Paths
None
## Validation
`make` from the workspace root failed before build: `Can't locate Module/Build.pm in @INC ... at Build.PL line 80`, followed by `make: *** [Makefile:149: Build] Error 2`.
`make check` failed because the project has no such target: `make: *** No rule to make target 'check'. Stop.`
Focused checks run after the project build blocker:
`perl -c -Ilib lib/Munin/Node/Server.pm` passed.
`perl -T -c -Ilib script/munin-node` passed. A non-taint compile was invalid because `-T` is on the shebang.
Independent reproduction attempt:
`timeout 7 strace -ttT -f -e trace=pselect6,select,poll,ppoll,nanosleep perl -T -Ilib script/munin-node ...` was blocked by sandbox ptrace policy: `PTRACE_TRACEME: Operation not permitted` and `ptrace(PTRACE_SEIZE, 7): Operation not permitted`.
Fallback smoke attempt:
Running `munin-node` in foreground with a temporary localhost config also could not reproduce the listener state because binding was blocked: `Cannot bind and listen to TCP port 24949 on 127.0.0.1 [Operation not permitted]`. Confidence stays `inferred`; no source diff was left.
## Review Pass 1
RESULT: ok
No source diff is present, which matches the `inferred` confidence level and the indirect profiler/strace evidence. The response includes the required sections, avoids claiming reproduction, names the project-level validation attempts and exact blockers, and explains why a timing/throttling source change would not be PR-ready without stronger evidence.
The no-patch diagnosis is acceptable for this pass.perl likely remains stuck in a busy-poll loop. A diagnosis report and patch proposal were created locally.
## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.
## Patch Pass
You are working on a bounded fixer proposal.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Produce the smallest reasonable patch for the target repository, keep the change upstreamable, prefer the clearest control flow available, and do not keep avoidable `goto` when a simpler structure would read better. Before introducing new file, process, allocation, locking, networking, or platform APIs, inspect nearby code and project contribution docs for existing helpers or compatibility wrappers and use those local patterns unless you can explain why they do not fit. Validate from a reproducible workspace-root entrypoint before falling back to focused leaf commands; if a build or test cannot run, report the exact command, the exact blocker, and any narrower check you ran instead. During validation, also try one bounded independent reproduction of the collected failure signal when it is safe and cheap, such as a failing test, smoke command, perf/strace comparison, or before/after runtime check. Only use `reproduced` if that command or test actually reproduced the failure; otherwise keep `observed` and report the reproduction blocker. The final explanation must connect the observed issue evidence to the actual code change, not just paraphrase the diff. Write like a maintainer is going to read the patch mail cold: explain the bug in plain language, define subsystem-specific jargon the first time you need it, and make the causal story obvious. Explicitly classify evidence confidence as `reproduced`, `observed`, or `inferred`: `reproduced` means you reproduced the failure locally; `observed` means Fixer has direct crash/log/trace evidence but you did not independently reproduce it; `inferred` means the source patch is not pull-request-ready, so do not leave a source diff unless you first gather stronger observed/reproduced evidence; otherwise return a no-patch diagnosis/report. For any source-changing `observed` patch, say explicitly in `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. Security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior need reproduced evidence plus explicit security-impact analysis before leaving a source diff; otherwise return a no-patch diagnosis/report for human review. If you introduce non-obvious state translation, index remapping, or backend split logic, add a short source comment that explains the invariant being preserved.
Start by explaining the likely root cause from the collected perf, strace, and /proc evidence. If you cannot land a safe patch, leave a diagnosis that is strong enough for an upstream bug report.
Interpreter process expectation: when the hot process is Python, Perl, shell, Node, Ruby, PHP, Lua, or another interpreter, inspect both the runtime and the script/application entrypoint from `details.interpreter_process`. Prefer the script or application package when evidence points there; do not patch the interpreter runtime merely because the hot binary is `python`, `perl`, `bash`, or similar. Runtime fixes are welcome only after checking the entrypoint and explaining why the runtime mishandles the workload or why running bad code faster/safer is itself the right upstream fix.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Keep the change narrowly scoped and summarize validation clearly.
In every authoring pass, your final response must start with `Subject: <single-line git commit subject>` and then include these markdown sections exactly:
## Commit Message
A short upstream-friendly explanation of what changed and why. Write it in plain language that a maintainer can follow without local complaint context. If you use subsystem jargon, define it immediately.
## Evidence Confidence
Exactly one word: `reproduced`, `observed`, or `inferred`. Use `reproduced` only when you reproduced the failure locally with a command or test, and include that command/test in `## Validation`. Use `observed` when Fixer has direct crash/log/trace evidence but you did not independently reproduce it. If `## Git Add Paths` lists source files for an `observed` patch, `## Issue Connection` must explicitly say the failure was observed by Fixer and not independently reproduced. Security-sensitive source changes touching authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior require reproduced evidence and explicit security-impact analysis; otherwise list `None` under `## Git Add Paths` and write a no-patch diagnosis/report. Use `inferred` for profiler/strace/indirect evidence; inferred responses may be no-patch diagnoses or reports, but inferred source patches are not pull-request-ready until stronger evidence is gathered.
## Issue Connection
Write this as maintainer-facing patch mail, not as local Fixer notes. Cover four things explicitly in readable sentences: the user-visible symptom or the exact collected signal, the code-level cause or the cautious inference from evidence, the specific change you made, and the expected effect. Do not invent a reproducer, command line, crash, or user-visible failure that is not present in the evidence bundle. If the evidence is direct-but-not-reproduced, say it was observed by Fixer and not independently reproduced. If the evidence is indirect and you did not gather stronger evidence, do not leave a source diff; write a no-patch diagnosis/report instead. Include an explicit effect sentence such as `The expected effect is ...`, `This should reduce ...`, or `This prevents ...` for source patches. If the logic is non-obvious in code, mention that you added a short explanatory comment.
## Git Add Paths
List the repo-relative paths that belong in the final patch, one per line. Use `None` only when you intentionally made no source changes. Include intentionally new files, and do not list generated build artifacts.
## Validation
List the checks you ran, or say clearly that you could not run them. Include the independent reproduction command/test and result when `## Evidence Confidence` is `reproduced`; if reproduction was attempted but blocked, name the exact blocker and keep confidence at `observed` or `inferred`.
Before editing, read the plan at `./plan-output.txt` and follow it unless the code proves part of it wrong. If you change course, say so explicitly in the final write-up instead of silently drifting from the plan.
## Review Pass 1
You are reviewing a freshly generated fixer patch.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Review the first patch pass. The original pre-edit snapshot is available at `./source` for diffing.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout. The latest author response is at `./patch-output.txt`. Inspect the current code and changed paths like a strict code reviewer. Focus on correctness, regressions, maintainability, awkward control flow such as avoidable `goto`, missing validation, weak or non-gittable commit message text, and explanations that fail to connect the observed issue evidence to the code change. Also review the maintainer experience: the patch mail should be easy to accept upstream, the user-visible bug should be explained in plain language, subsystem-specific jargon should be defined when first used, and any non-obvious state translation or index remapping in code should have a short explanatory comment. Reject patches that omit `## Evidence Confidence`, use anything other than `reproduced`, `observed`, or `inferred`, or sound more certain than that evidence level allows. Reject patches that claim `reproduced` unless `## Validation` names the concrete reproduction command or test and its result. Reject source patches in security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior unless the author reproduced the behavior and explicitly analyzed the security impact of the change; observed-only evidence should become a diagnosis/report, not a PR-ready source diff. Reject patches that invent a reproducer, command line, crash, or user-visible failure not present in the evidence bundle; indirect profiler or strace evidence may justify a cautious mitigation, but the author must say it is indirect instead of presenting it as a confirmed upstream bug. Reject patches that introduce generic libc/std APIs when nearby code or project docs provide a local compat/helper API for the same job, unless the author explicitly justifies the exception. Reject validation that only reports a leaf object/syntax build when a project-level configure/build/test entrypoint exists and was not attempted; if a full build cannot run, the author must show the exact failed command and blocker.
Do not apply code changes in this pass.
Return a short markdown review report. The first non-empty line must be exactly one of:
RESULT: ok
RESULT: fix-needed
If you choose `RESULT: fix-needed`, add a `## Findings` section with concrete, actionable items.## Plan Pass
## Problem
Fixer observed `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` in a poll-family syscall loop, but the retained evidence shows `pselect6` blocking for about 1.8-2.0 seconds, process state `S (sleeping)`, and only 0.9% CPU during the sample. There is no Perl-level stack tying the profiler signal to a Munin source line, so a Munin source patch is not justified yet.
## Evidence Confidence
inferred
## Proposed Subject
No source patch yet: document a diagnosis and collect entrypoint-level evidence for `munin-node` before changing Munin or Perl.
## Patch Plan
Do not edit files in this pass. The likely code path is `script/munin-node` -> `Munin::Node::Server` -> `Net::Server::Fork`, with Munin’s own per-request timeout handled by `Munin::Common::Timeout::do_with_timeout`. Local conventions found: `CONTRIBUTING.md` requires newline-terminated files, `HACKING.pod` asks for `strict`, `warnings`, taint-mode-aware Perl, local file style, and tests through `Build.PL`/`make test`.
Before any future patch, collect a bounded Perl/script-level trace showing whether `Net::Server::Fork` is waking too often, a Munin command loop is spinning, or the current evidence is just normal listener timeout behavior. If a real Munin issue is reproduced, patch the narrow Munin entrypoint/subsystem rather than Perl runtime first, using existing helpers such as `Munin::Common::Timeout`, `Munin::Common::Logger`, and existing `Net::Server` configuration flow. Avoid awkward control flow such as avoidable `goto`; use a bounded conditional/helper change instead.
No prior Fixer patch was found to improve or replace; workspace history only shows `Fixer baseline`.
## Risks
A source patch based only on this evidence would risk changing normal daemon wakeup behavior. The evidence may reflect expected `Net::Server::Fork` select timeouts, not runaway CPU. Listener timing changes could affect daemon responsiveness or shutdown/reload behavior, so they should only follow a reproduced high-wakeup/high-CPU signal.
## Validation
First try project-level validation from the workspace root: `make`. `make check` is not available (`No rule to make target 'check'`), so use the project’s documented test target `make test` if dependencies allow.
For bounded independent evidence collection, run `munin-node` from the script entrypoint in foreground with a temporary localhost/high-port config and capture `strace -ttT -f -e trace=pselect6,select,poll,ppoll,nanosleep` plus `ps -o pid,stat,pcpu,etime,wchan,args`. Only claim reproduction if that command shows rapid non-blocking poll wakeups or sustained CPU; otherwise report it as not reproduced and keep the no-patch diagnosis.
## Patch Pass
Subject: No patch: diagnose munin-node poll evidence
## Commit Message
No source change is proposed. The collected evidence points to `munin-node` sleeping in the `Net::Server::Fork` listener wait, not to a proven Munin busy loop. The saved plan was followed: inspect the Perl script entrypoint first, then avoid changing listener timing without reproduced evidence.
## Evidence Confidence
inferred
## Issue Connection
Fixer observed `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` with repeated poll-family syscalls and a native stack under `select()`. The same evidence also shows `pselect6` calls blocking for about 1.8-2.0 seconds, process state `S (sleeping)`, `wchan` in `poll_schedule_timeout`, and only 0.9% CPU. The likely root cause is therefore a profiler/classifier signal from sampling a normal blocking listener wait, not a demonstrated tight userspace loop.
The relevant code path is `script/munin-node` loading `Munin::Node::Server`, which subclasses `Net::Server::Fork`; Munin’s own per-request loop uses `Munin::Common::Timeout::do_with_timeout`, and plugin process handling uses `Munin::Node::OS->run_as_child`. I found no Munin-owned busy poll loop to patch safely. Local conventions from `CONTRIBUTING.md` and `HACKING.pod` are taint-mode-aware Perl with `strict`/`warnings`, local style, and `Build.PL`/`make test` validation.
Because the evidence remains indirect and local reproduction was blocked by sandbox restrictions, leaving a timing/throttling source diff would not be pull-request-ready. The expected effect is no code churn from a speculative fix; this diagnosis should be used as the upstream bug-report basis if stronger process-level traces can be collected on an unrestricted host.
## Git Add Paths
None
## Validation
`make` from the workspace root failed before build: `Can't locate Module/Build.pm in @INC ... at Build.PL line 80`, followed by `make: *** [Makefile:149: Build] Error 2`.
`make check` failed because the project has no such target: `make: *** No rule to make target 'check'. Stop.`
Focused checks run after the project build blocker:
`perl -c -Ilib lib/Munin/Node/Server.pm` passed.
`perl -T -c -Ilib script/munin-node` passed. A non-taint compile was invalid because `-T` is on the shebang.
Independent reproduction attempt:
`timeout 7 strace -ttT -f -e trace=pselect6,select,poll,ppoll,nanosleep perl -T -Ilib script/munin-node ...` was blocked by sandbox ptrace policy: `PTRACE_TRACEME: Operation not permitted` and `ptrace(PTRACE_SEIZE, 7): Operation not permitted`.
Fallback smoke attempt:
Running `munin-node` in foreground with a temporary localhost config also could not reproduce the listener state because binding was blocked: `Cannot bind and listen to TCP port 24949 on 127.0.0.1 [Operation not permitted]`. Confidence stays `inferred`; no source diff was left.
## Review Pass 1
RESULT: ok
No source diff is present, which matches the `inferred` confidence level and the indirect profiler/strace evidence. The response includes the required sections, avoids claiming reproduction, names the project-level validation attempts and exact blockers, and explains why a timing/throttling source change would not be PR-ready without stronger evidence.
The no-patch diagnosis is acceptable for this pass.perl likely remains stuck in a busy-poll loop. A diagnosis report and patch proposal were created locally.
## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.
## Patch Pass
You are working on a bounded fixer proposal.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Produce the smallest reasonable patch for the target repository, keep the change upstreamable, prefer the clearest control flow available, and do not keep avoidable `goto` when a simpler structure would read better. Before introducing new file, process, allocation, locking, networking, or platform APIs, inspect nearby code and project contribution docs for existing helpers or compatibility wrappers and use those local patterns unless you can explain why they do not fit. Validate from a reproducible workspace-root entrypoint before falling back to focused leaf commands; if a build or test cannot run, report the exact command, the exact blocker, and any narrower check you ran instead. During validation, also try one bounded independent reproduction of the collected failure signal when it is safe and cheap, such as a failing test, smoke command, perf/strace comparison, or before/after runtime check. Only use `reproduced` if that command or test actually reproduced the failure; otherwise keep `observed` and report the reproduction blocker. The final explanation must connect the observed issue evidence to the actual code change, not just paraphrase the diff. Write like a maintainer is going to read the patch mail cold: explain the bug in plain language, define subsystem-specific jargon the first time you need it, and make the causal story obvious. Explicitly classify evidence confidence as `reproduced`, `observed`, or `inferred`: `reproduced` means you reproduced the failure locally; `observed` means Fixer has direct crash/log/trace evidence but you did not independently reproduce it; `inferred` means the source patch is not pull-request-ready, so do not leave a source diff unless you first gather stronger observed/reproduced evidence; otherwise return a no-patch diagnosis/report. For any source-changing `observed` patch, say explicitly in `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. Security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior need reproduced evidence plus explicit security-impact analysis before leaving a source diff; otherwise return a no-patch diagnosis/report for human review. If you introduce non-obvious state translation, index remapping, or backend split logic, add a short source comment that explains the invariant being preserved.
Start by explaining the likely root cause from the collected perf, strace, and /proc evidence. If you cannot land a safe patch, leave a diagnosis that is strong enough for an upstream bug report.
Interpreter process expectation: when the hot process is Python, Perl, shell, Node, Ruby, PHP, Lua, or another interpreter, inspect both the runtime and the script/application entrypoint from `details.interpreter_process`. Prefer the script or application package when evidence points there; do not patch the interpreter runtime merely because the hot binary is `python`, `perl`, `bash`, or similar. Runtime fixes are welcome only after checking the entrypoint and explaining why the runtime mishandles the workload or why running bad code faster/safer is itself the right upstream fix.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Keep the change narrowly scoped and summarize validation clearly.
In every authoring pass, your final response must start with `Subject: <single-line git commit subject>` and then include these markdown sections exactly:
## Commit Message
A short upstream-friendly explanation of what changed and why. Write it in plain language that a maintainer can follow without local complaint context. If you use subsystem jargon, define it immediately.
## Evidence Confidence
Exactly one word: `reproduced`, `observed`, or `inferred`. Use `reproduced` only when you reproduced the failure locally with a command or test, and include that command/test in `## Validation`. Use `observed` when Fixer has direct crash/log/trace evidence but you did not independently reproduce it. If `## Git Add Paths` lists source files for an `observed` patch, `## Issue Connection` must explicitly say the failure was observed by Fixer and not independently reproduced. Security-sensitive source changes touching authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior require reproduced evidence and explicit security-impact analysis; otherwise list `None` under `## Git Add Paths` and write a no-patch diagnosis/report. Use `inferred` for profiler/strace/indirect evidence; inferred responses may be no-patch diagnoses or reports, but inferred source patches are not pull-request-ready until stronger evidence is gathered.
## Issue Connection
Write this as maintainer-facing patch mail, not as local Fixer notes. Cover four things explicitly in readable sentences: the user-visible symptom or the exact collected signal, the code-level cause or the cautious inference from evidence, the specific change you made, and the expected effect. Do not invent a reproducer, command line, crash, or user-visible failure that is not present in the evidence bundle. If the evidence is direct-but-not-reproduced, say it was observed by Fixer and not independently reproduced. If the evidence is indirect and you did not gather stronger evidence, do not leave a source diff; write a no-patch diagnosis/report instead. Include an explicit effect sentence such as `The expected effect is ...`, `This should reduce ...`, or `This prevents ...` for source patches. If the logic is non-obvious in code, mention that you added a short explanatory comment.
## Git Add Paths
List the repo-relative paths that belong in the final patch, one per line. Use `None` only when you intentionally made no source changes. Include intentionally new files, and do not list generated build artifacts.
## Validation
List the checks you ran, or say clearly that you could not run them. Include the independent reproduction command/test and result when `## Evidence Confidence` is `reproduced`; if reproduction was attempted but blocked, name the exact blocker and keep confidence at `observed` or `inferred`.
Before editing, read the plan at `./plan-output.txt` and follow it unless the code proves part of it wrong. If you change course, say so explicitly in the final write-up instead of silently drifting from the plan.
## Review Pass 1
You are reviewing a freshly generated fixer patch.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Review the first patch pass. The original pre-edit snapshot is available at `./source` for diffing.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout. The latest author response is at `./patch-output.txt`. Inspect the current code and changed paths like a strict code reviewer. Focus on correctness, regressions, maintainability, awkward control flow such as avoidable `goto`, missing validation, weak or non-gittable commit message text, and explanations that fail to connect the observed issue evidence to the code change. Also review the maintainer experience: the patch mail should be easy to accept upstream, the user-visible bug should be explained in plain language, subsystem-specific jargon should be defined when first used, and any non-obvious state translation or index remapping in code should have a short explanatory comment. Reject patches that omit `## Evidence Confidence`, use anything other than `reproduced`, `observed`, or `inferred`, or sound more certain than that evidence level allows. Reject patches that claim `reproduced` unless `## Validation` names the concrete reproduction command or test and its result. Reject source patches in security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior unless the author reproduced the behavior and explicitly analyzed the security impact of the change; observed-only evidence should become a diagnosis/report, not a PR-ready source diff. Reject patches that invent a reproducer, command line, crash, or user-visible failure not present in the evidence bundle; indirect profiler or strace evidence may justify a cautious mitigation, but the author must say it is indirect instead of presenting it as a confirmed upstream bug. Reject patches that introduce generic libc/std APIs when nearby code or project docs provide a local compat/helper API for the same job, unless the author explicitly justifies the exception. Reject validation that only reports a leaf object/syntax build when a project-level configure/build/test entrypoint exists and was not attempted; if a full build cannot run, the author must show the exact failed command and blocker.
Do not apply code changes in this pass.
Return a short markdown review report. The first non-empty line must be exactly one of:
RESULT: ok
RESULT: fix-needed
If you choose `RESULT: fix-needed`, add a `## Findings` section with concrete, actionable items.## Plan Pass
## Problem
Fixer observed `munin-node` as `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` in repeated `pselect6`, but the retained evidence does not prove a Munin busy loop. The only `strace` lines show `pselect6` blocking for about 1.8-2.0 seconds, matching `Net::Server::Fork`’s `can_read(2)` accept loop, and `/proc` reported `S (sleeping)` with max CPU around 0.9%.
## Evidence Confidence
observed
## Proposed Subject
No source patch yet: diagnose the Fixer finding as evidence-limited idle `munin-node` polling unless an independent reproduction shows rapid wakeups or CPU burn.
## Patch Plan
Do not edit Munin in this pass. A source change would be speculative because Munin delegates the accept loop to `Net::Server::Fork`, and the observed 2-second `pselect6` timeout is normal for that module.
Before any future patch, collect one extra signal tying the wakeups to Munin code: a bounded `strace` showing short/zero-timeout polling under load or a Perl-level stack/trace while CPU is high. If that evidence points into Munin request handling, patch the narrow local subsystem and follow `CONTRIBUTING.md`/`HACKING.pod`: strict/warnings Perl, clear `English` variable names, existing indentation per file, no avoidable `goto`.
Relevant local conventions/helpers found: `Munin::Common::Daemon::emit_sd_notify_message()` for daemon readiness, `Munin::Common::Timeout::do_with_timeout()` for bounded operations, and `Munin::Node::OS->run_as_child()` for plugin execution. No Munin-local accept-loop helper was found; `lib/Munin/Node/Server.pm` inherits `Net::Server::Fork`.
No prior Fixer patch is present to improve or replace; existing Debian patches are unrelated.
## Risks
A patch that changes Munin’s accept-loop cadence, foreground handling, or signal behavior could regress daemon readiness, HUP handling, or connection acceptance without addressing the observed evidence. This area touches service availability timing but not authentication, credentials, cryptography, sandboxing, or permissions.
## Validation
First try project-level validation from the workspace root: `make`, then `make check` if the target exists; this project appears to use `make test`, so run `make test` when `make check` is unavailable.
Bounded independent reproduction before patching: after build-generated files exist, run `munin-node` in foreground under a temporary minimal config and trace `pselect6/select` for a few seconds. Treat 2-second blocking `pselect6` calls plus low CPU as non-reproduction; only proceed with a source patch if the command shows rapid wakeups or high CPU tied to Munin code.
## Patch Pass
Subject: Diagnose munin-node poll evidence without patch
## Commit Message
No source change is included. The collected evidence points to an idle `munin-node` process waiting in the `Net::Server::Fork` accept loop, not to a confirmed Munin busy loop. The retained `pselect6` calls block for about two seconds, which matches the dependency’s normal listener polling interval.
## Evidence Confidence
inferred
## Issue Connection
Fixer collected a native stack for `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` with repeated `pselect6` samples, but the same bundle reports `S (sleeping)`, max CPU around 0.9%, and `pselect6` calls sleeping for roughly 1.8-2.0 seconds.
The cautious code-level inference is that Munin is idle in `Net::Server::Fork`, where `accept()` waits with `can_read(2)`. `script/munin-node` delegates to `Munin::Node::Server`, and `Munin::Node::Server` inherits `Net::Server::Fork`; no Munin-local accept-loop helper was found. Local conventions checked: `CONTRIBUTING.md`, `HACKING.pod`, `Munin::Common::Daemon::emit_sd_notify_message()`, `Munin::Common::Timeout::do_with_timeout()`, and `Munin::Node::OS->run_as_child()`.
I made no code change because the evidence does not tie the sampled polling to a source bug, and the independent reproduction attempts were blocked by sandbox restrictions before a listener could idle under trace. The expected effect is that no speculative upstream diff is proposed until a trace or test shows rapid wakeups or CPU burn in Munin code.
## Git Add Paths
None
## Validation
`make` from the workspace root failed before build: `Can't locate Module/Build.pm in @INC ... at Build.PL line 80`, followed by `make: *** [Makefile:149: Build] Error 2`.
`make -n check` failed because the project has no `check` target: `make: *** No rule to make target 'check'. Stop.` The Makefile provides `make test`, but it also depends on the missing generated `Build` script.
Focused checks:
`perl -c lib/Munin/Node/Server.pm` passed.
`perl -c script/munin-node` failed because `-T` is on the shebang.
`perl -T -Ilib -c script/munin-node` passed.
Independent reproduction attempts:
`timeout 7 strace -ttT -f -e trace=pselect6,select,poll,ppoll ... munin-node --foreground ...` was blocked by sandbox ptrace restrictions: `PTRACE_TRACEME: Operation not permitted`.
A non-ptrace foreground smoke with temporary config failed before idling because TCP bind is not permitted in this sandbox, for both `port 0` and `port 14949`: `Cannot bind and listen ... [Operation not permitted]`.
## Review Pass 1
RESULT: ok
No source diff is present, and the author correctly left `Git Add Paths` as `None`. The diagnosis is appropriately cautious for profiler/strace evidence that does not independently demonstrate a Munin busy loop, and it does not overclaim reproduction.
Validation is acceptable for a no-patch report: `make` was attempted and blocked by missing `Module::Build`, `make check` availability was checked, focused Perl syntax checks were run, and the bounded runtime reproduction attempt reports concrete sandbox blockers. The report also names the relevant entrypoint, `Net::Server::Fork` accept-loop behavior, contribution docs, and local helpers/conventions.perl likely remains stuck in a busy-poll loop. A diagnosis report and patch proposal were created locally.
## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.
## Patch Pass
You are working on a bounded fixer proposal.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Produce the smallest reasonable patch for the target repository, keep the change upstreamable, prefer the clearest control flow available, and do not keep avoidable `goto` when a simpler structure would read better. Before introducing new file, process, allocation, locking, networking, or platform APIs, inspect nearby code and project contribution docs for existing helpers or compatibility wrappers and use those local patterns unless you can explain why they do not fit. Validate from a reproducible workspace-root entrypoint before falling back to focused leaf commands; if a build or test cannot run, report the exact command, the exact blocker, and any narrower check you ran instead. During validation, also try one bounded independent reproduction of the collected failure signal when it is safe and cheap, such as a failing test, smoke command, perf/strace comparison, or before/after runtime check. Only use `reproduced` if that command or test actually reproduced the failure; otherwise keep `observed` and report the reproduction blocker. The final explanation must connect the observed issue evidence to the actual code change, not just paraphrase the diff. Write like a maintainer is going to read the patch mail cold: explain the bug in plain language, define subsystem-specific jargon the first time you need it, and make the causal story obvious. Explicitly classify evidence confidence as `reproduced`, `observed`, or `inferred`: `reproduced` means you reproduced the failure locally; `observed` means Fixer has direct crash/log/trace evidence but you did not independently reproduce it; `inferred` means the source patch is not pull-request-ready, so do not leave a source diff unless you first gather stronger observed/reproduced evidence; otherwise return a no-patch diagnosis/report. For any source-changing `observed` patch, say explicitly in `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. Security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior need reproduced evidence plus explicit security-impact analysis before leaving a source diff; otherwise return a no-patch diagnosis/report for human review. If you introduce non-obvious state translation, index remapping, or backend split logic, add a short source comment that explains the invariant being preserved.
Start by explaining the likely root cause from the collected perf, strace, and /proc evidence. If you cannot land a safe patch, leave a diagnosis that is strong enough for an upstream bug report.
Interpreter process expectation: when the hot process is Python, Perl, shell, Node, Ruby, PHP, Lua, or another interpreter, inspect both the runtime and the script/application entrypoint from `details.interpreter_process`. Prefer the script or application package when evidence points there; do not patch the interpreter runtime merely because the hot binary is `python`, `perl`, `bash`, or similar. Runtime fixes are welcome only after checking the entrypoint and explaining why the runtime mishandles the workload or why running bad code faster/safer is itself the right upstream fix.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Keep the change narrowly scoped and summarize validation clearly.
In every authoring pass, your final response must start with `Subject: <single-line git commit subject>` and then include these markdown sections exactly:
## Commit Message
A short upstream-friendly explanation of what changed and why. Write it in plain language that a maintainer can follow without local complaint context. If you use subsystem jargon, define it immediately.
## Evidence Confidence
Exactly one word: `reproduced`, `observed`, or `inferred`. Use `reproduced` only when you reproduced the failure locally with a command or test, and include that command/test in `## Validation`. Use `observed` when Fixer has direct crash/log/trace evidence but you did not independently reproduce it. If `## Git Add Paths` lists source files for an `observed` patch, `## Issue Connection` must explicitly say the failure was observed by Fixer and not independently reproduced. Security-sensitive source changes touching authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior require reproduced evidence and explicit security-impact analysis; otherwise list `None` under `## Git Add Paths` and write a no-patch diagnosis/report. Use `inferred` for profiler/strace/indirect evidence; inferred responses may be no-patch diagnoses or reports, but inferred source patches are not pull-request-ready until stronger evidence is gathered.
## Issue Connection
Write this as maintainer-facing patch mail, not as local Fixer notes. Cover four things explicitly in readable sentences: the user-visible symptom or the exact collected signal, the code-level cause or the cautious inference from evidence, the specific change you made, and the expected effect. Do not invent a reproducer, command line, crash, or user-visible failure that is not present in the evidence bundle. If the evidence is direct-but-not-reproduced, say it was observed by Fixer and not independently reproduced. If the evidence is indirect and you did not gather stronger evidence, do not leave a source diff; write a no-patch diagnosis/report instead. Include an explicit effect sentence such as `The expected effect is ...`, `This should reduce ...`, or `This prevents ...` for source patches. If the logic is non-obvious in code, mention that you added a short explanatory comment.
## Git Add Paths
List the repo-relative paths that belong in the final patch, one per line. Use `None` only when you intentionally made no source changes. Include intentionally new files, and do not list generated build artifacts.
## Validation
List the checks you ran, or say clearly that you could not run them. Include the independent reproduction command/test and result when `## Evidence Confidence` is `reproduced`; if reproduction was attempted but blocked, name the exact blocker and keep confidence at `observed` or `inferred`.
Before editing, read the plan at `./plan-output.txt` and follow it unless the code proves part of it wrong. If you change course, say so explicitly in the final write-up instead of silently drifting from the plan.
## Review Pass 1
You are reviewing a freshly generated fixer patch.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Review the first patch pass. The original pre-edit snapshot is available at `./source` for diffing.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout. The latest author response is at `./patch-output.txt`. Inspect the current code and changed paths like a strict code reviewer. Focus on correctness, regressions, maintainability, awkward control flow such as avoidable `goto`, missing validation, weak or non-gittable commit message text, and explanations that fail to connect the observed issue evidence to the code change. Also review the maintainer experience: the patch mail should be easy to accept upstream, the user-visible bug should be explained in plain language, subsystem-specific jargon should be defined when first used, and any non-obvious state translation or index remapping in code should have a short explanatory comment. Reject patches that omit `## Evidence Confidence`, use anything other than `reproduced`, `observed`, or `inferred`, or sound more certain than that evidence level allows. Reject patches that claim `reproduced` unless `## Validation` names the concrete reproduction command or test and its result. Reject source patches in security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior unless the author reproduced the behavior and explicitly analyzed the security impact of the change; observed-only evidence should become a diagnosis/report, not a PR-ready source diff. Reject patches that invent a reproducer, command line, crash, or user-visible failure not present in the evidence bundle; indirect profiler or strace evidence may justify a cautious mitigation, but the author must say it is indirect instead of presenting it as a confirmed upstream bug. Reject patches that introduce generic libc/std APIs when nearby code or project docs provide a local compat/helper API for the same job, unless the author explicitly justifies the exception. Reject validation that only reports a leaf object/syntax build when a project-level configure/build/test entrypoint exists and was not attempted; if a full build cannot run, the author must show the exact failed command and blocker.
Do not apply code changes in this pass.
Return a short markdown review report. The first non-empty line must be exactly one of:
RESULT: ok
RESULT: fix-needed
If you choose `RESULT: fix-needed`, add a `## Findings` section with concrete, actionable items.## Plan Pass
## Problem
Fixer observed `munin-node` as `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` in repeated `pselect6`, but the retained evidence does not prove a Munin busy loop. The only `strace` lines show `pselect6` blocking for about 1.8-2.0 seconds, matching `Net::Server::Fork`’s `can_read(2)` accept loop, and `/proc` reported `S (sleeping)` with max CPU around 0.9%.
## Evidence Confidence
observed
## Proposed Subject
No source patch yet: diagnose the Fixer finding as evidence-limited idle `munin-node` polling unless an independent reproduction shows rapid wakeups or CPU burn.
## Patch Plan
Do not edit Munin in this pass. A source change would be speculative because Munin delegates the accept loop to `Net::Server::Fork`, and the observed 2-second `pselect6` timeout is normal for that module.
Before any future patch, collect one extra signal tying the wakeups to Munin code: a bounded `strace` showing short/zero-timeout polling under load or a Perl-level stack/trace while CPU is high. If that evidence points into Munin request handling, patch the narrow local subsystem and follow `CONTRIBUTING.md`/`HACKING.pod`: strict/warnings Perl, clear `English` variable names, existing indentation per file, no avoidable `goto`.
Relevant local conventions/helpers found: `Munin::Common::Daemon::emit_sd_notify_message()` for daemon readiness, `Munin::Common::Timeout::do_with_timeout()` for bounded operations, and `Munin::Node::OS->run_as_child()` for plugin execution. No Munin-local accept-loop helper was found; `lib/Munin/Node/Server.pm` inherits `Net::Server::Fork`.
No prior Fixer patch is present to improve or replace; existing Debian patches are unrelated.
## Risks
A patch that changes Munin’s accept-loop cadence, foreground handling, or signal behavior could regress daemon readiness, HUP handling, or connection acceptance without addressing the observed evidence. This area touches service availability timing but not authentication, credentials, cryptography, sandboxing, or permissions.
## Validation
First try project-level validation from the workspace root: `make`, then `make check` if the target exists; this project appears to use `make test`, so run `make test` when `make check` is unavailable.
Bounded independent reproduction before patching: after build-generated files exist, run `munin-node` in foreground under a temporary minimal config and trace `pselect6/select` for a few seconds. Treat 2-second blocking `pselect6` calls plus low CPU as non-reproduction; only proceed with a source patch if the command shows rapid wakeups or high CPU tied to Munin code.
## Patch Pass
Subject: Diagnose munin-node poll evidence without patch
## Commit Message
No source change is included. The collected evidence points to an idle `munin-node` process waiting in the `Net::Server::Fork` accept loop, not to a confirmed Munin busy loop. The retained `pselect6` calls block for about two seconds, which matches the dependency’s normal listener polling interval.
## Evidence Confidence
inferred
## Issue Connection
Fixer collected a native stack for `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` with repeated `pselect6` samples, but the same bundle reports `S (sleeping)`, max CPU around 0.9%, and `pselect6` calls sleeping for roughly 1.8-2.0 seconds.
The cautious code-level inference is that Munin is idle in `Net::Server::Fork`, where `accept()` waits with `can_read(2)`. `script/munin-node` delegates to `Munin::Node::Server`, and `Munin::Node::Server` inherits `Net::Server::Fork`; no Munin-local accept-loop helper was found. Local conventions checked: `CONTRIBUTING.md`, `HACKING.pod`, `Munin::Common::Daemon::emit_sd_notify_message()`, `Munin::Common::Timeout::do_with_timeout()`, and `Munin::Node::OS->run_as_child()`.
I made no code change because the evidence does not tie the sampled polling to a source bug, and the independent reproduction attempts were blocked by sandbox restrictions before a listener could idle under trace. The expected effect is that no speculative upstream diff is proposed until a trace or test shows rapid wakeups or CPU burn in Munin code.
## Git Add Paths
None
## Validation
`make` from the workspace root failed before build: `Can't locate Module/Build.pm in @INC ... at Build.PL line 80`, followed by `make: *** [Makefile:149: Build] Error 2`.
`make -n check` failed because the project has no `check` target: `make: *** No rule to make target 'check'. Stop.` The Makefile provides `make test`, but it also depends on the missing generated `Build` script.
Focused checks:
`perl -c lib/Munin/Node/Server.pm` passed.
`perl -c script/munin-node` failed because `-T` is on the shebang.
`perl -T -Ilib -c script/munin-node` passed.
Independent reproduction attempts:
`timeout 7 strace -ttT -f -e trace=pselect6,select,poll,ppoll ... munin-node --foreground ...` was blocked by sandbox ptrace restrictions: `PTRACE_TRACEME: Operation not permitted`.
A non-ptrace foreground smoke with temporary config failed before idling because TCP bind is not permitted in this sandbox, for both `port 0` and `port 14949`: `Cannot bind and listen ... [Operation not permitted]`.
## Review Pass 1
RESULT: ok
No source diff is present, and the author correctly left `Git Add Paths` as `None`. The diagnosis is appropriately cautious for profiler/strace evidence that does not independently demonstrate a Munin busy loop, and it does not overclaim reproduction.
Validation is acceptable for a no-patch report: `make` was attempted and blocked by missing `Module::Build`, `make check` availability was checked, focused Perl syntax checks were run, and the bounded runtime reproduction attempt reports concrete sandbox blockers. The report also names the relevant entrypoint, `Net::Server::Fork` accept-loop behavior, contribution docs, and local helpers/conventions.perl likely remains stuck in a busy-poll loop. A diagnosis report and patch proposal were created locally.
## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.
## Patch Pass
You are working on a bounded fixer proposal.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Produce the smallest reasonable patch for the target repository, keep the change upstreamable, prefer the clearest control flow available, and do not keep avoidable `goto` when a simpler structure would read better. Before introducing new file, process, allocation, locking, networking, or platform APIs, inspect nearby code and project contribution docs for existing helpers or compatibility wrappers and use those local patterns unless you can explain why they do not fit. Validate from a reproducible workspace-root entrypoint before falling back to focused leaf commands; if a build or test cannot run, report the exact command, the exact blocker, and any narrower check you ran instead. During validation, also try one bounded independent reproduction of the collected failure signal when it is safe and cheap, such as a failing test, smoke command, perf/strace comparison, or before/after runtime check. Only use `reproduced` if that command or test actually reproduced the failure; otherwise keep `observed` and report the reproduction blocker. The final explanation must connect the observed issue evidence to the actual code change, not just paraphrase the diff. Write like a maintainer is going to read the patch mail cold: explain the bug in plain language, define subsystem-specific jargon the first time you need it, and make the causal story obvious. Explicitly classify evidence confidence as `reproduced`, `observed`, or `inferred`: `reproduced` means you reproduced the failure locally; `observed` means Fixer has direct crash/log/trace evidence but you did not independently reproduce it; `inferred` means the source patch is not pull-request-ready, so do not leave a source diff unless you first gather stronger observed/reproduced evidence; otherwise return a no-patch diagnosis/report. For any source-changing `observed` patch, say explicitly in `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. Security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior need reproduced evidence plus explicit security-impact analysis before leaving a source diff; otherwise return a no-patch diagnosis/report for human review. If you introduce non-obvious state translation, index remapping, or backend split logic, add a short source comment that explains the invariant being preserved.
Start by explaining the likely root cause from the collected perf, strace, and /proc evidence. If you cannot land a safe patch, leave a diagnosis that is strong enough for an upstream bug report.
Interpreter process expectation: when the hot process is Python, Perl, shell, Node, Ruby, PHP, Lua, or another interpreter, inspect both the runtime and the script/application entrypoint from `details.interpreter_process`. Prefer the script or application package when evidence points there; do not patch the interpreter runtime merely because the hot binary is `python`, `perl`, `bash`, or similar. Runtime fixes are welcome only after checking the entrypoint and explaining why the runtime mishandles the workload or why running bad code faster/safer is itself the right upstream fix.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Keep the change narrowly scoped and summarize validation clearly.
In every authoring pass, your final response must start with `Subject: <single-line git commit subject>` and then include these markdown sections exactly:
## Commit Message
A short upstream-friendly explanation of what changed and why. Write it in plain language that a maintainer can follow without local complaint context. If you use subsystem jargon, define it immediately.
## Evidence Confidence
Exactly one word: `reproduced`, `observed`, or `inferred`. Use `reproduced` only when you reproduced the failure locally with a command or test, and include that command/test in `## Validation`. Use `observed` when Fixer has direct crash/log/trace evidence but you did not independently reproduce it. If `## Git Add Paths` lists source files for an `observed` patch, `## Issue Connection` must explicitly say the failure was observed by Fixer and not independently reproduced. Security-sensitive source changes touching authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior require reproduced evidence and explicit security-impact analysis; otherwise list `None` under `## Git Add Paths` and write a no-patch diagnosis/report. Use `inferred` for profiler/strace/indirect evidence; inferred responses may be no-patch diagnoses or reports, but inferred source patches are not pull-request-ready until stronger evidence is gathered.
## Issue Connection
Write this as maintainer-facing patch mail, not as local Fixer notes. Cover four things explicitly in readable sentences: the user-visible symptom or the exact collected signal, the code-level cause or the cautious inference from evidence, the specific change you made, and the expected effect. Do not invent a reproducer, command line, crash, or user-visible failure that is not present in the evidence bundle. If the evidence is direct-but-not-reproduced, say it was observed by Fixer and not independently reproduced. If the evidence is indirect and you did not gather stronger evidence, do not leave a source diff; write a no-patch diagnosis/report instead. Include an explicit effect sentence such as `The expected effect is ...`, `This should reduce ...`, or `This prevents ...` for source patches. If the logic is non-obvious in code, mention that you added a short explanatory comment.
## Git Add Paths
List the repo-relative paths that belong in the final patch, one per line. Use `None` only when you intentionally made no source changes. Include intentionally new files, and do not list generated build artifacts.
## Validation
List the checks you ran, or say clearly that you could not run them. Include the independent reproduction command/test and result when `## Evidence Confidence` is `reproduced`; if reproduction was attempted but blocked, name the exact blocker and keep confidence at `observed` or `inferred`.
Before editing, read the plan at `./plan-output.txt` and follow it unless the code proves part of it wrong. If you change course, say so explicitly in the final write-up instead of silently drifting from the plan.
## Review Pass 1
You are reviewing a freshly generated fixer patch.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Review the first patch pass. The original pre-edit snapshot is available at `./source` for diffing.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout. The latest author response is at `./patch-output.txt`. Inspect the current code and changed paths like a strict code reviewer. Focus on correctness, regressions, maintainability, awkward control flow such as avoidable `goto`, missing validation, weak or non-gittable commit message text, and explanations that fail to connect the observed issue evidence to the code change. Also review the maintainer experience: the patch mail should be easy to accept upstream, the user-visible bug should be explained in plain language, subsystem-specific jargon should be defined when first used, and any non-obvious state translation or index remapping in code should have a short explanatory comment. Reject patches that omit `## Evidence Confidence`, use anything other than `reproduced`, `observed`, or `inferred`, or sound more certain than that evidence level allows. Reject patches that claim `reproduced` unless `## Validation` names the concrete reproduction command or test and its result. Reject source patches in security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior unless the author reproduced the behavior and explicitly analyzed the security impact of the change; observed-only evidence should become a diagnosis/report, not a PR-ready source diff. Reject patches that invent a reproducer, command line, crash, or user-visible failure not present in the evidence bundle; indirect profiler or strace evidence may justify a cautious mitigation, but the author must say it is indirect instead of presenting it as a confirmed upstream bug. Reject patches that introduce generic libc/std APIs when nearby code or project docs provide a local compat/helper API for the same job, unless the author explicitly justifies the exception. Reject validation that only reports a leaf object/syntax build when a project-level configure/build/test entrypoint exists and was not attempted; if a full build cannot run, the author must show the exact failed command and blocker.
Do not apply code changes in this pass.
Return a short markdown review report. The first non-empty line must be exactly one of:
RESULT: ok
RESULT: fix-needed
If you choose `RESULT: fix-needed`, add a `## Findings` section with concrete, actionable items.## Plan Pass
## Problem
Fixer flagged `/usr/sbin/munin-node --foreground` as a Perl runaway/busy-poll candidate, but the retained evidence does not tie the signal to a Munin source defect. The trace shows `pselect6` calls sleeping for about 1.8-2.0 seconds, process state `S (sleeping)`, and only `0.9%` CPU over the profile target. There is no Perl-level stack or reproducer showing a tight application loop.
## Evidence Confidence
inferred
## Proposed Subject
No source patch yet: diagnose the munin-node busy-poll report as insufficiently supported, and require a bounded reproduction or Perl-level stack before changing timing behavior.
## Patch Plan
Do not edit files in this pass. The likely implicated entrypoint is `script/munin-node`, which delegates request handling to `Munin::Node::Server` and plugin subprocess handling to `Munin::Node::Service` plus `Munin::Node::OS`.
Relevant local conventions/helpers found:
`Munin::Common::Timeout::do_with_timeout` for bounded waits, `Munin::Node::OS->run_as_child`/`_read_from_child` for plugin subprocess IO, `Munin::Common::Logger` macros for logging, and Net::Server::Fork for the daemon accept/request loop. Style docs are `CONTRIBUTING.md` and `HACKING.pod`: strict/warnings, taint-mode Perl, one statement per line, follow local indentation.
Because any change here would affect timeout/timing behavior and the evidence does not reproduce a security or availability impact, a source patch is blocked for now. If later evidence shows a real zero-timeout or repeated immediate wakeup, patch the narrow helper responsible, using existing timeout/logging helpers and clean bounded conditionals rather than awkward `goto` flow.
No prior Fixer patch was present in the workspace to improve or replace; `git status --short` was clean.
## Risks
Changing the node wait loop or plugin read loop without a reproducer could regress legitimate blocking IO, plugin timeout enforcement, TLS sessions, or Net::Server lifecycle behavior. The current evidence may simply show normal idle waiting under a global/session timeout.
## Validation
Before any future patch, try the project-level entrypoint from the workspace root: `make`, then `make check` if available; if dependencies or generated files are missing, record the exact command and failure.
Bounded independent reproduction to collect before editing: run `script/munin-node --foreground` with a test config and capture `strace -ttT -f -e trace=pselect6,select,poll,ppoll,epoll_wait,nanosleep,clock_nanosleep` plus process CPU/wchan. Only claim `reproduced` if it shows immediate repeated poll wakeups or sustained CPU, not the current observed 2-second blocking `pselect6` pattern.
## Patch Pass
Subject: Diagnose munin-node idle select evidence
## Commit Message
No source change is included. The collected signal most likely shows `munin-node` waiting in a normal timed `select`/`pselect6` path, not a proven runaway loop: the process was sleeping, CPU was low, and each observed syscall blocked for about two seconds.
## Evidence Confidence
inferred
## Issue Connection
Fixer observed `/usr/sbin/munin-node --foreground` under Perl repeatedly reaching `pselect6`, with a native Perl backtrace ending in `select()`. The same bundle shows the process in `S (sleeping)`, `wchan` at `poll_schedule_timeout`, only `0.9%` CPU, and `pselect6` calls timing out after about `1.8-2.0` seconds. That is indirect profiler/trace evidence, not a local reproduction of a busy loop.
I inspected the Perl script entrypoint `script/munin-node`, the node server code in `Munin::Node::Server`, plugin execution in `Munin::Node::Service`, and process/IO helpers in `Munin::Node::OS`. The relevant local helpers and conventions are `Munin::Common::Timeout::do_with_timeout`, `Munin::Node::OS->run_as_child`, `_read_from_child`, `Munin::Common::Logger`, and `Net::Server::Fork`; style guidance is in `CONTRIBUTING.md` and `HACKING.pod`. I also checked the local Perl runtime version, but the evidence points first at the script entrypoint and does not prove a Perl runtime bug.
Because a patch here would change timing/throttling behavior, and the failure was not reproduced or tied to a specific Munin source defect, I followed the saved plan and left no source diff. The expected effect is that this proposal is safe for upstream review as a diagnosis: stronger evidence is needed, such as a Perl-level stack or an allowed `strace`/CPU reproduction showing immediate poll wakeups or sustained CPU.
## Git Add Paths
None
## Validation
`make` from the workspace root failed before project build/test generation: `Can't locate Module/Build.pm in @INC ... at Build.PL line 80`, followed by `make: *** [Makefile:149: Build] Error 2`.
`make check` failed because the target is unavailable: `make: *** No rule to make target 'check'. Stop.`
Focused checks run:
`perl -Ilib -c lib/Munin/Node/Server.pm` passed.
`perl -Ilib -c lib/Munin/Common/Timeout.pm` passed.
`perl -Ilib -c lib/Munin/Node/OS.pm` passed, with redefinition warnings from installed Munin modules on `@INC`.
`perl -Ilib -c lib/Munin/Node/Service.pm` passed.
Independent reproduction attempt:
`timeout 7s strace -ff -ttT -e trace=pselect6,select,poll,ppoll,epoll_wait,nanosleep,clock_nanosleep /usr/bin/munin-node --foreground ...` was blocked by ptrace restrictions: `PTRACE_TRACEME: Operation not permitted` and `ptrace(PTRACE_SEIZE, 5): Operation not permitted`.
A fallback installed-`munin-node` smoke command with absolute config/plugin paths exited with status `1` and no stdout/stderr, so it did not reproduce the collected poll signal. `git diff` is empty.
## Review Pass 1
RESULT: ok
No blocking review findings. The workspace has no source diff, which matches the `inferred` evidence level and the timing/throttling sensitivity of the reported area. The author checked project docs, inspected the interpreter entrypoint and Munin helper paths, did not overclaim reproduction, attempted `make`/`make check`, reported exact blockers, and left a diagnosis instead of a speculative source patch.perl likely remains stuck in a busy-poll loop. A diagnosis report and patch proposal were created locally.
## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.
## Patch Pass
You are working on a bounded fixer proposal.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Produce the smallest reasonable patch for the target repository, keep the change upstreamable, prefer the clearest control flow available, and do not keep avoidable `goto` when a simpler structure would read better. Before introducing new file, process, allocation, locking, networking, or platform APIs, inspect nearby code and project contribution docs for existing helpers or compatibility wrappers and use those local patterns unless you can explain why they do not fit. Validate from a reproducible workspace-root entrypoint before falling back to focused leaf commands; if a build or test cannot run, report the exact command, the exact blocker, and any narrower check you ran instead. During validation, also try one bounded independent reproduction of the collected failure signal when it is safe and cheap, such as a failing test, smoke command, perf/strace comparison, or before/after runtime check. Only use `reproduced` if that command or test actually reproduced the failure; otherwise keep `observed` and report the reproduction blocker. The final explanation must connect the observed issue evidence to the actual code change, not just paraphrase the diff. Write like a maintainer is going to read the patch mail cold: explain the bug in plain language, define subsystem-specific jargon the first time you need it, and make the causal story obvious. Explicitly classify evidence confidence as `reproduced`, `observed`, or `inferred`: `reproduced` means you reproduced the failure locally; `observed` means Fixer has direct crash/log/trace evidence but you did not independently reproduce it; `inferred` means the source patch is not pull-request-ready, so do not leave a source diff unless you first gather stronger observed/reproduced evidence; otherwise return a no-patch diagnosis/report. For any source-changing `observed` patch, say explicitly in `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. Security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior need reproduced evidence plus explicit security-impact analysis before leaving a source diff; otherwise return a no-patch diagnosis/report for human review. If you introduce non-obvious state translation, index remapping, or backend split logic, add a short source comment that explains the invariant being preserved.
Start by explaining the likely root cause from the collected perf, strace, and /proc evidence. If you cannot land a safe patch, leave a diagnosis that is strong enough for an upstream bug report.
Interpreter process expectation: when the hot process is Python, Perl, shell, Node, Ruby, PHP, Lua, or another interpreter, inspect both the runtime and the script/application entrypoint from `details.interpreter_process`. Prefer the script or application package when evidence points there; do not patch the interpreter runtime merely because the hot binary is `python`, `perl`, `bash`, or similar. Runtime fixes are welcome only after checking the entrypoint and explaining why the runtime mishandles the workload or why running bad code faster/safer is itself the right upstream fix.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Keep the change narrowly scoped and summarize validation clearly.
In every authoring pass, your final response must start with `Subject: <single-line git commit subject>` and then include these markdown sections exactly:
## Commit Message
A short upstream-friendly explanation of what changed and why. Write it in plain language that a maintainer can follow without local complaint context. If you use subsystem jargon, define it immediately.
## Evidence Confidence
Exactly one word: `reproduced`, `observed`, or `inferred`. Use `reproduced` only when you reproduced the failure locally with a command or test, and include that command/test in `## Validation`. Use `observed` when Fixer has direct crash/log/trace evidence but you did not independently reproduce it. If `## Git Add Paths` lists source files for an `observed` patch, `## Issue Connection` must explicitly say the failure was observed by Fixer and not independently reproduced. Security-sensitive source changes touching authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior require reproduced evidence and explicit security-impact analysis; otherwise list `None` under `## Git Add Paths` and write a no-patch diagnosis/report. Use `inferred` for profiler/strace/indirect evidence; inferred responses may be no-patch diagnoses or reports, but inferred source patches are not pull-request-ready until stronger evidence is gathered.
## Issue Connection
Write this as maintainer-facing patch mail, not as local Fixer notes. Cover four things explicitly in readable sentences: the user-visible symptom or the exact collected signal, the code-level cause or the cautious inference from evidence, the specific change you made, and the expected effect. Do not invent a reproducer, command line, crash, or user-visible failure that is not present in the evidence bundle. If the evidence is direct-but-not-reproduced, say it was observed by Fixer and not independently reproduced. If the evidence is indirect and you did not gather stronger evidence, do not leave a source diff; write a no-patch diagnosis/report instead. Include an explicit effect sentence such as `The expected effect is ...`, `This should reduce ...`, or `This prevents ...` for source patches. If the logic is non-obvious in code, mention that you added a short explanatory comment.
## Git Add Paths
List the repo-relative paths that belong in the final patch, one per line. Use `None` only when you intentionally made no source changes. Include intentionally new files, and do not list generated build artifacts.
## Validation
List the checks you ran, or say clearly that you could not run them. Include the independent reproduction command/test and result when `## Evidence Confidence` is `reproduced`; if reproduction was attempted but blocked, name the exact blocker and keep confidence at `observed` or `inferred`.
Before editing, read the plan at `./plan-output.txt` and follow it unless the code proves part of it wrong. If you change course, say so explicitly in the final write-up instead of silently drifting from the plan.
## Review Pass 1
You are reviewing a freshly generated fixer patch.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Review the first patch pass. The original pre-edit snapshot is available at `./source` for diffing.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout. The latest author response is at `./patch-output.txt`. Inspect the current code and changed paths like a strict code reviewer. Focus on correctness, regressions, maintainability, awkward control flow such as avoidable `goto`, missing validation, weak or non-gittable commit message text, and explanations that fail to connect the observed issue evidence to the code change. Also review the maintainer experience: the patch mail should be easy to accept upstream, the user-visible bug should be explained in plain language, subsystem-specific jargon should be defined when first used, and any non-obvious state translation or index remapping in code should have a short explanatory comment. Reject patches that omit `## Evidence Confidence`, use anything other than `reproduced`, `observed`, or `inferred`, or sound more certain than that evidence level allows. Reject patches that claim `reproduced` unless `## Validation` names the concrete reproduction command or test and its result. Reject source patches in security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior unless the author reproduced the behavior and explicitly analyzed the security impact of the change; observed-only evidence should become a diagnosis/report, not a PR-ready source diff. Reject patches that invent a reproducer, command line, crash, or user-visible failure not present in the evidence bundle; indirect profiler or strace evidence may justify a cautious mitigation, but the author must say it is indirect instead of presenting it as a confirmed upstream bug. Reject patches that introduce generic libc/std APIs when nearby code or project docs provide a local compat/helper API for the same job, unless the author explicitly justifies the exception. Reject validation that only reports a leaf object/syntax build when a project-level configure/build/test entrypoint exists and was not attempted; if a full build cannot run, the author must show the exact failed command and blocker.
Do not apply code changes in this pass.
Return a short markdown review report. The first non-empty line must be exactly one of:
RESULT: ok
RESULT: fix-needed
If you choose `RESULT: fix-needed`, add a `## Findings` section with concrete, actionable items.## Plan Pass
## Problem
Fixer flagged `/usr/sbin/munin-node --foreground` as a Perl runaway/busy-poll candidate, but the retained evidence does not tie the signal to a Munin source defect. The trace shows `pselect6` calls sleeping for about 1.8-2.0 seconds, process state `S (sleeping)`, and only `0.9%` CPU over the profile target. There is no Perl-level stack or reproducer showing a tight application loop.
## Evidence Confidence
inferred
## Proposed Subject
No source patch yet: diagnose the munin-node busy-poll report as insufficiently supported, and require a bounded reproduction or Perl-level stack before changing timing behavior.
## Patch Plan
Do not edit files in this pass. The likely implicated entrypoint is `script/munin-node`, which delegates request handling to `Munin::Node::Server` and plugin subprocess handling to `Munin::Node::Service` plus `Munin::Node::OS`.
Relevant local conventions/helpers found:
`Munin::Common::Timeout::do_with_timeout` for bounded waits, `Munin::Node::OS->run_as_child`/`_read_from_child` for plugin subprocess IO, `Munin::Common::Logger` macros for logging, and Net::Server::Fork for the daemon accept/request loop. Style docs are `CONTRIBUTING.md` and `HACKING.pod`: strict/warnings, taint-mode Perl, one statement per line, follow local indentation.
Because any change here would affect timeout/timing behavior and the evidence does not reproduce a security or availability impact, a source patch is blocked for now. If later evidence shows a real zero-timeout or repeated immediate wakeup, patch the narrow helper responsible, using existing timeout/logging helpers and clean bounded conditionals rather than awkward `goto` flow.
No prior Fixer patch was present in the workspace to improve or replace; `git status --short` was clean.
## Risks
Changing the node wait loop or plugin read loop without a reproducer could regress legitimate blocking IO, plugin timeout enforcement, TLS sessions, or Net::Server lifecycle behavior. The current evidence may simply show normal idle waiting under a global/session timeout.
## Validation
Before any future patch, try the project-level entrypoint from the workspace root: `make`, then `make check` if available; if dependencies or generated files are missing, record the exact command and failure.
Bounded independent reproduction to collect before editing: run `script/munin-node --foreground` with a test config and capture `strace -ttT -f -e trace=pselect6,select,poll,ppoll,epoll_wait,nanosleep,clock_nanosleep` plus process CPU/wchan. Only claim `reproduced` if it shows immediate repeated poll wakeups or sustained CPU, not the current observed 2-second blocking `pselect6` pattern.
## Patch Pass
Subject: Diagnose munin-node idle select evidence
## Commit Message
No source change is included. The collected signal most likely shows `munin-node` waiting in a normal timed `select`/`pselect6` path, not a proven runaway loop: the process was sleeping, CPU was low, and each observed syscall blocked for about two seconds.
## Evidence Confidence
inferred
## Issue Connection
Fixer observed `/usr/sbin/munin-node --foreground` under Perl repeatedly reaching `pselect6`, with a native Perl backtrace ending in `select()`. The same bundle shows the process in `S (sleeping)`, `wchan` at `poll_schedule_timeout`, only `0.9%` CPU, and `pselect6` calls timing out after about `1.8-2.0` seconds. That is indirect profiler/trace evidence, not a local reproduction of a busy loop.
I inspected the Perl script entrypoint `script/munin-node`, the node server code in `Munin::Node::Server`, plugin execution in `Munin::Node::Service`, and process/IO helpers in `Munin::Node::OS`. The relevant local helpers and conventions are `Munin::Common::Timeout::do_with_timeout`, `Munin::Node::OS->run_as_child`, `_read_from_child`, `Munin::Common::Logger`, and `Net::Server::Fork`; style guidance is in `CONTRIBUTING.md` and `HACKING.pod`. I also checked the local Perl runtime version, but the evidence points first at the script entrypoint and does not prove a Perl runtime bug.
Because a patch here would change timing/throttling behavior, and the failure was not reproduced or tied to a specific Munin source defect, I followed the saved plan and left no source diff. The expected effect is that this proposal is safe for upstream review as a diagnosis: stronger evidence is needed, such as a Perl-level stack or an allowed `strace`/CPU reproduction showing immediate poll wakeups or sustained CPU.
## Git Add Paths
None
## Validation
`make` from the workspace root failed before project build/test generation: `Can't locate Module/Build.pm in @INC ... at Build.PL line 80`, followed by `make: *** [Makefile:149: Build] Error 2`.
`make check` failed because the target is unavailable: `make: *** No rule to make target 'check'. Stop.`
Focused checks run:
`perl -Ilib -c lib/Munin/Node/Server.pm` passed.
`perl -Ilib -c lib/Munin/Common/Timeout.pm` passed.
`perl -Ilib -c lib/Munin/Node/OS.pm` passed, with redefinition warnings from installed Munin modules on `@INC`.
`perl -Ilib -c lib/Munin/Node/Service.pm` passed.
Independent reproduction attempt:
`timeout 7s strace -ff -ttT -e trace=pselect6,select,poll,ppoll,epoll_wait,nanosleep,clock_nanosleep /usr/bin/munin-node --foreground ...` was blocked by ptrace restrictions: `PTRACE_TRACEME: Operation not permitted` and `ptrace(PTRACE_SEIZE, 5): Operation not permitted`.
A fallback installed-`munin-node` smoke command with absolute config/plugin paths exited with status `1` and no stdout/stderr, so it did not reproduce the collected poll signal. `git diff` is empty.
## Review Pass 1
RESULT: ok
No blocking review findings. The workspace has no source diff, which matches the `inferred` evidence level and the timing/throttling sensitivity of the reported area. The author checked project docs, inspected the interpreter entrypoint and Munin helper paths, did not overclaim reproduction, attempted `make`/`make check`, reported exact blockers, and left a diagnosis instead of a speculative source patch.perl likely remains stuck in a busy-poll loop. A diagnosis report and patch proposal were created locally.
## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.
## Patch Pass
You are working on a bounded fixer proposal.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Produce the smallest reasonable patch for the target repository, keep the change upstreamable, prefer the clearest control flow available, and do not keep avoidable `goto` when a simpler structure would read better. Before introducing new file, process, allocation, locking, networking, or platform APIs, inspect nearby code and project contribution docs for existing helpers or compatibility wrappers and use those local patterns unless you can explain why they do not fit. Validate from a reproducible workspace-root entrypoint before falling back to focused leaf commands; if a build or test cannot run, report the exact command, the exact blocker, and any narrower check you ran instead. During validation, also try one bounded independent reproduction of the collected failure signal when it is safe and cheap, such as a failing test, smoke command, perf/strace comparison, or before/after runtime check. Only use `reproduced` if that command or test actually reproduced the failure; otherwise keep `observed` and report the reproduction blocker. The final explanation must connect the observed issue evidence to the actual code change, not just paraphrase the diff. Write like a maintainer is going to read the patch mail cold: explain the bug in plain language, define subsystem-specific jargon the first time you need it, and make the causal story obvious. Explicitly classify evidence confidence as `reproduced`, `observed`, or `inferred`: `reproduced` means you reproduced the failure locally; `observed` means Fixer has direct crash/log/trace evidence but you did not independently reproduce it; `inferred` means the source patch is not pull-request-ready, so do not leave a source diff unless you first gather stronger observed/reproduced evidence; otherwise return a no-patch diagnosis/report. For any source-changing `observed` patch, say explicitly in `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. Security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior need reproduced evidence plus explicit security-impact analysis before leaving a source diff; otherwise return a no-patch diagnosis/report for human review. If you introduce non-obvious state translation, index remapping, or backend split logic, add a short source comment that explains the invariant being preserved.
Start by explaining the likely root cause from the collected perf, strace, and /proc evidence. If you cannot land a safe patch, leave a diagnosis that is strong enough for an upstream bug report.
Interpreter process expectation: when the hot process is Python, Perl, shell, Node, Ruby, PHP, Lua, or another interpreter, inspect both the runtime and the script/application entrypoint from `details.interpreter_process`. Prefer the script or application package when evidence points there; do not patch the interpreter runtime merely because the hot binary is `python`, `perl`, `bash`, or similar. Runtime fixes are welcome only after checking the entrypoint and explaining why the runtime mishandles the workload or why running bad code faster/safer is itself the right upstream fix.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Keep the change narrowly scoped and summarize validation clearly.
In every authoring pass, your final response must start with `Subject: <single-line git commit subject>` and then include these markdown sections exactly:
## Commit Message
A short upstream-friendly explanation of what changed and why. Write it in plain language that a maintainer can follow without local complaint context. If you use subsystem jargon, define it immediately.
## Evidence Confidence
Exactly one word: `reproduced`, `observed`, or `inferred`. Use `reproduced` only when you reproduced the failure locally with a command or test, and include that command/test in `## Validation`. Use `observed` when Fixer has direct crash/log/trace evidence but you did not independently reproduce it. If `## Git Add Paths` lists source files for an `observed` patch, `## Issue Connection` must explicitly say the failure was observed by Fixer and not independently reproduced. Security-sensitive source changes touching authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior require reproduced evidence and explicit security-impact analysis; otherwise list `None` under `## Git Add Paths` and write a no-patch diagnosis/report. Use `inferred` for profiler/strace/indirect evidence; inferred responses may be no-patch diagnoses or reports, but inferred source patches are not pull-request-ready until stronger evidence is gathered.
## Issue Connection
Write this as maintainer-facing patch mail, not as local Fixer notes. Cover four things explicitly in readable sentences: the user-visible symptom or the exact collected signal, the code-level cause or the cautious inference from evidence, the specific change you made, and the expected effect. Do not invent a reproducer, command line, crash, or user-visible failure that is not present in the evidence bundle. If the evidence is direct-but-not-reproduced, say it was observed by Fixer and not independently reproduced. If the evidence is indirect and you did not gather stronger evidence, do not leave a source diff; write a no-patch diagnosis/report instead. Include an explicit effect sentence such as `The expected effect is ...`, `This should reduce ...`, or `This prevents ...` for source patches. If the logic is non-obvious in code, mention that you added a short explanatory comment.
## Git Add Paths
List the repo-relative paths that belong in the final patch, one per line. Use `None` only when you intentionally made no source changes. Include intentionally new files, and do not list generated build artifacts.
## Validation
List the checks you ran, or say clearly that you could not run them. Include the independent reproduction command/test and result when `## Evidence Confidence` is `reproduced`; if reproduction was attempted but blocked, name the exact blocker and keep confidence at `observed` or `inferred`.
Before editing, read the plan at `./plan-output.txt` and follow it unless the code proves part of it wrong. If you change course, say so explicitly in the final write-up instead of silently drifting from the plan.
## Review Pass 1
You are reviewing a freshly generated fixer patch.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Review the first patch pass. The original pre-edit snapshot is available at `./source` for diffing.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout. The latest author response is at `./patch-output.txt`. Inspect the current code and changed paths like a strict code reviewer. Focus on correctness, regressions, maintainability, awkward control flow such as avoidable `goto`, missing validation, weak or non-gittable commit message text, and explanations that fail to connect the observed issue evidence to the code change. Also review the maintainer experience: the patch mail should be easy to accept upstream, the user-visible bug should be explained in plain language, subsystem-specific jargon should be defined when first used, and any non-obvious state translation or index remapping in code should have a short explanatory comment. Reject patches that omit `## Evidence Confidence`, use anything other than `reproduced`, `observed`, or `inferred`, or sound more certain than that evidence level allows. Reject patches that claim `reproduced` unless `## Validation` names the concrete reproduction command or test and its result. Reject source patches in security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior unless the author reproduced the behavior and explicitly analyzed the security impact of the change; observed-only evidence should become a diagnosis/report, not a PR-ready source diff. Reject patches that invent a reproducer, command line, crash, or user-visible failure not present in the evidence bundle; indirect profiler or strace evidence may justify a cautious mitigation, but the author must say it is indirect instead of presenting it as a confirmed upstream bug. Reject patches that introduce generic libc/std APIs when nearby code or project docs provide a local compat/helper API for the same job, unless the author explicitly justifies the exception. Reject validation that only reports a leaf object/syntax build when a project-level configure/build/test entrypoint exists and was not attempted; if a full build cannot run, the author must show the exact failed command and blocker.
Do not apply code changes in this pass.
Return a short markdown review report. The first non-empty line must be exactly one of:
RESULT: ok
RESULT: fix-needed
If you choose `RESULT: fix-needed`, add a `## Findings` section with concrete, actionable items.## Plan Pass
## Problem
Fixer observed `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` in a `pselect6`/`select` path and classified it as a likely busy poll. The retained evidence also shows the process sleeping, only about `0.9%` CPU, and `pselect6` calls blocking for about `1.8-2.0s`, so there is not enough evidence for a source patch to `munin-node` yet.
## Evidence Confidence
inferred
## Proposed Subject
No source patch: diagnose `munin-node` idle `select` evidence before changing event-loop behavior
## Patch Plan
Do not edit source in this pass. The evidence does not tie the sampled `select` loop to a Munin source line, plugin command, or confirmed CPU runaway. The inspected entrypoint is `script/munin-node`, which creates `Munin::Node::Server`; that class subclasses `Net::Server::Fork`, so the idle accept loop is largely owned by `Net::Server`, not local Munin code.
If stronger evidence is collected later, investigate `Munin::Node::Server::process_request`, `_net_read`, and plugin execution through `Munin::Node::Service`/`Munin::Node::OS` first. Follow local conventions from `HACKING.pod`: `use strict`, `use warnings`, `English qw(-no_match_vars)`, one statement per line, and no avoidable awkward control flow such as `goto`. Relevant local helpers are `Munin::Common::Timeout::do_with_timeout` for bounded operations, `Munin::Common::Logger` for logging, and `Munin::Node::OS` for plugin child/process handling. No local helper was found for replacing the `Net::Server::Fork` accept-loop polling itself.
No prior Fixer source patch exists in this workspace; there is nothing to improve or replace.
## Risks
Changing idle accept-loop timing without reproduced evidence risks altering daemon responsiveness or `Net::Server` behavior for a normal sleeping process. Timing/throttling behavior is security-sensitive under the Fixer policy, so a source patch should wait until validation reproduces excessive wakeups or CPU use and can explain the impact.
## Validation
Before any future focused check, run from the workspace root:
`make`
There is no `make check` target in the inspected `Makefile`; use the project test entrypoint:
`make test`
For bounded independent reproduction, after `make` generates the Perl build files, run `munin-node` in foreground with a temporary config on a high loopback port and trace only wait syscalls for a few seconds, for example with `timeout 8s strace -ttT -f -e trace=pselect6,select,poll,ppoll,epoll_wait,nanosleep,clock_nanosleep ...`. Treat it as reproduced only if it shows rapid nonblocking wakeups or meaningful CPU use; if it shows multi-second blocking waits like the evidence bundle, keep this as a no-patch diagnosis.
## Patch Pass
Subject: Diagnose munin-node idle select evidence without patch
## Commit Message
No source change. The collected evidence points to an idle `munin-node` wait in `select`, not a confirmed Munin CPU loop, so a timing or event-loop patch would be speculative.
## Evidence Confidence
inferred
## Issue Connection
Fixer sampled `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` with native frames under `select`, a kernel stack in `poll_schedule_timeout`, and repeated `pselect6` calls. The same evidence also reports process state `S (sleeping)`, `wchan` as `poll_schedule_timeout.constprop.0`, only `0.9%` max CPU, and `pselect6` calls blocking for about `1.8-2.0s`.
The likely root cause is normal idle waiting in the `munin-node` server accept loop, not a proven script-level busy loop. The application entrypoint is `script/munin-node`, which delegates server operation to `Munin::Node::Server`; that module subclasses `Net::Server::Fork`, so the relevant accept-loop wait is owned by `Net::Server`. The local request and plugin paths already use Munin helpers such as `Munin::Common::Timeout::do_with_timeout`, `Munin::Common::Logger`, and `Munin::Node::OS` process helpers.
I followed the saved plan and made no source change. The expected effect is no runtime behavior change; this avoids landing a speculative timing/throttling patch without reproduced evidence or a Perl-level stack tying the sampled wait to Munin application logic.
## Git Add Paths
None
## Validation
`make` from the workspace root failed before building Munin because `Module::Build` is missing: `Can't locate Module/Build.pm in @INC ... at Build.PL line 80`.
`make test` failed for the same `Module::Build` dependency blocker.
`make -n check` confirmed there is no `check` target: `No rule to make target 'check'`.
Focused syntax checks:
`perl -Ilib -c lib/Munin/Common/Timeout.pm` passed.
`perl -Ilib -c lib/Munin/Node/OS.pm` passed, with redefinition warnings from the local/module load environment.
`perl -Ilib -c lib/Munin/Node/Server.pm` passed.
`perl -T -Ilib -c script/munin-node` passed.
Independent reproduction attempt:
`timeout -s INT 8s strace -ttT -f -e trace=pselect6,select,poll,ppoll,epoll_wait,nanosleep,clock_nanosleep ... perl -T -Ilib script/munin-node --foreground ...` was blocked by sandbox ptrace restrictions: `PTRACE_TRACEME: Operation not permitted`.
A non-ptrace foreground smoke run was also blocked from starting the server because binding a local TCP socket failed with `Operation not permitted`.
## Review Pass 1
RESULT: ok
No findings. The workspace has no source diff, `## Evidence Confidence` is valid and appropriately set to `inferred`, and the no-patch diagnosis matches the evidence limits: the captured process was sleeping in `pselect6` with low CPU rather than a reproduced Munin busy loop. Validation attempted the project-level entrypoints and reported exact blockers.perl likely remains stuck in a busy-poll loop. A diagnosis report and patch proposal were created locally.
## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.
## Patch Pass
You are working on a bounded fixer proposal.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Produce the smallest reasonable patch for the target repository, keep the change upstreamable, prefer the clearest control flow available, and do not keep avoidable `goto` when a simpler structure would read better. Before introducing new file, process, allocation, locking, networking, or platform APIs, inspect nearby code and project contribution docs for existing helpers or compatibility wrappers and use those local patterns unless you can explain why they do not fit. Validate from a reproducible workspace-root entrypoint before falling back to focused leaf commands; if a build or test cannot run, report the exact command, the exact blocker, and any narrower check you ran instead. During validation, also try one bounded independent reproduction of the collected failure signal when it is safe and cheap, such as a failing test, smoke command, perf/strace comparison, or before/after runtime check. Only use `reproduced` if that command or test actually reproduced the failure; otherwise keep `observed` and report the reproduction blocker. The final explanation must connect the observed issue evidence to the actual code change, not just paraphrase the diff. Write like a maintainer is going to read the patch mail cold: explain the bug in plain language, define subsystem-specific jargon the first time you need it, and make the causal story obvious. Explicitly classify evidence confidence as `reproduced`, `observed`, or `inferred`: `reproduced` means you reproduced the failure locally; `observed` means Fixer has direct crash/log/trace evidence but you did not independently reproduce it; `inferred` means the source patch is not pull-request-ready, so do not leave a source diff unless you first gather stronger observed/reproduced evidence; otherwise return a no-patch diagnosis/report. For any source-changing `observed` patch, say explicitly in `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. Security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior need reproduced evidence plus explicit security-impact analysis before leaving a source diff; otherwise return a no-patch diagnosis/report for human review. If you introduce non-obvious state translation, index remapping, or backend split logic, add a short source comment that explains the invariant being preserved.
Start by explaining the likely root cause from the collected perf, strace, and /proc evidence. If you cannot land a safe patch, leave a diagnosis that is strong enough for an upstream bug report.
Interpreter process expectation: when the hot process is Python, Perl, shell, Node, Ruby, PHP, Lua, or another interpreter, inspect both the runtime and the script/application entrypoint from `details.interpreter_process`. Prefer the script or application package when evidence points there; do not patch the interpreter runtime merely because the hot binary is `python`, `perl`, `bash`, or similar. Runtime fixes are welcome only after checking the entrypoint and explaining why the runtime mishandles the workload or why running bad code faster/safer is itself the right upstream fix.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Keep the change narrowly scoped and summarize validation clearly.
In every authoring pass, your final response must start with `Subject: <single-line git commit subject>` and then include these markdown sections exactly:
## Commit Message
A short upstream-friendly explanation of what changed and why. Write it in plain language that a maintainer can follow without local complaint context. If you use subsystem jargon, define it immediately.
## Evidence Confidence
Exactly one word: `reproduced`, `observed`, or `inferred`. Use `reproduced` only when you reproduced the failure locally with a command or test, and include that command/test in `## Validation`. Use `observed` when Fixer has direct crash/log/trace evidence but you did not independently reproduce it. If `## Git Add Paths` lists source files for an `observed` patch, `## Issue Connection` must explicitly say the failure was observed by Fixer and not independently reproduced. Security-sensitive source changes touching authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior require reproduced evidence and explicit security-impact analysis; otherwise list `None` under `## Git Add Paths` and write a no-patch diagnosis/report. Use `inferred` for profiler/strace/indirect evidence; inferred responses may be no-patch diagnoses or reports, but inferred source patches are not pull-request-ready until stronger evidence is gathered.
## Issue Connection
Write this as maintainer-facing patch mail, not as local Fixer notes. Cover four things explicitly in readable sentences: the user-visible symptom or the exact collected signal, the code-level cause or the cautious inference from evidence, the specific change you made, and the expected effect. Do not invent a reproducer, command line, crash, or user-visible failure that is not present in the evidence bundle. If the evidence is direct-but-not-reproduced, say it was observed by Fixer and not independently reproduced. If the evidence is indirect and you did not gather stronger evidence, do not leave a source diff; write a no-patch diagnosis/report instead. Include an explicit effect sentence such as `The expected effect is ...`, `This should reduce ...`, or `This prevents ...` for source patches. If the logic is non-obvious in code, mention that you added a short explanatory comment.
## Git Add Paths
List the repo-relative paths that belong in the final patch, one per line. Use `None` only when you intentionally made no source changes. Include intentionally new files, and do not list generated build artifacts.
## Validation
List the checks you ran, or say clearly that you could not run them. Include the independent reproduction command/test and result when `## Evidence Confidence` is `reproduced`; if reproduction was attempted but blocked, name the exact blocker and keep confidence at `observed` or `inferred`.
Before editing, read the plan at `./plan-output.txt` and follow it unless the code proves part of it wrong. If you change course, say so explicitly in the final write-up instead of silently drifting from the plan.
## Review Pass 1
You are reviewing a freshly generated fixer patch.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Review the first patch pass. The original pre-edit snapshot is available at `./source` for diffing.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout. The latest author response is at `./patch-output.txt`. Inspect the current code and changed paths like a strict code reviewer. Focus on correctness, regressions, maintainability, awkward control flow such as avoidable `goto`, missing validation, weak or non-gittable commit message text, and explanations that fail to connect the observed issue evidence to the code change. Also review the maintainer experience: the patch mail should be easy to accept upstream, the user-visible bug should be explained in plain language, subsystem-specific jargon should be defined when first used, and any non-obvious state translation or index remapping in code should have a short explanatory comment. Reject patches that omit `## Evidence Confidence`, use anything other than `reproduced`, `observed`, or `inferred`, or sound more certain than that evidence level allows. Reject patches that claim `reproduced` unless `## Validation` names the concrete reproduction command or test and its result. Reject source patches in security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior unless the author reproduced the behavior and explicitly analyzed the security impact of the change; observed-only evidence should become a diagnosis/report, not a PR-ready source diff. Reject patches that invent a reproducer, command line, crash, or user-visible failure not present in the evidence bundle; indirect profiler or strace evidence may justify a cautious mitigation, but the author must say it is indirect instead of presenting it as a confirmed upstream bug. Reject patches that introduce generic libc/std APIs when nearby code or project docs provide a local compat/helper API for the same job, unless the author explicitly justifies the exception. Reject validation that only reports a leaf object/syntax build when a project-level configure/build/test entrypoint exists and was not attempted; if a full build cannot run, the author must show the exact failed command and blocker.
Do not apply code changes in this pass.
Return a short markdown review report. The first non-empty line must be exactly one of:
RESULT: ok
RESULT: fix-needed
If you choose `RESULT: fix-needed`, add a `## Findings` section with concrete, actionable items.## Plan Pass
## Problem
Fixer observed `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` in a `pselect6`/`select` path and classified it as a likely busy poll. The retained evidence also shows the process sleeping, only about `0.9%` CPU, and `pselect6` calls blocking for about `1.8-2.0s`, so there is not enough evidence for a source patch to `munin-node` yet.
## Evidence Confidence
inferred
## Proposed Subject
No source patch: diagnose `munin-node` idle `select` evidence before changing event-loop behavior
## Patch Plan
Do not edit source in this pass. The evidence does not tie the sampled `select` loop to a Munin source line, plugin command, or confirmed CPU runaway. The inspected entrypoint is `script/munin-node`, which creates `Munin::Node::Server`; that class subclasses `Net::Server::Fork`, so the idle accept loop is largely owned by `Net::Server`, not local Munin code.
If stronger evidence is collected later, investigate `Munin::Node::Server::process_request`, `_net_read`, and plugin execution through `Munin::Node::Service`/`Munin::Node::OS` first. Follow local conventions from `HACKING.pod`: `use strict`, `use warnings`, `English qw(-no_match_vars)`, one statement per line, and no avoidable awkward control flow such as `goto`. Relevant local helpers are `Munin::Common::Timeout::do_with_timeout` for bounded operations, `Munin::Common::Logger` for logging, and `Munin::Node::OS` for plugin child/process handling. No local helper was found for replacing the `Net::Server::Fork` accept-loop polling itself.
No prior Fixer source patch exists in this workspace; there is nothing to improve or replace.
## Risks
Changing idle accept-loop timing without reproduced evidence risks altering daemon responsiveness or `Net::Server` behavior for a normal sleeping process. Timing/throttling behavior is security-sensitive under the Fixer policy, so a source patch should wait until validation reproduces excessive wakeups or CPU use and can explain the impact.
## Validation
Before any future focused check, run from the workspace root:
`make`
There is no `make check` target in the inspected `Makefile`; use the project test entrypoint:
`make test`
For bounded independent reproduction, after `make` generates the Perl build files, run `munin-node` in foreground with a temporary config on a high loopback port and trace only wait syscalls for a few seconds, for example with `timeout 8s strace -ttT -f -e trace=pselect6,select,poll,ppoll,epoll_wait,nanosleep,clock_nanosleep ...`. Treat it as reproduced only if it shows rapid nonblocking wakeups or meaningful CPU use; if it shows multi-second blocking waits like the evidence bundle, keep this as a no-patch diagnosis.
## Patch Pass
Subject: Diagnose munin-node idle select evidence without patch
## Commit Message
No source change. The collected evidence points to an idle `munin-node` wait in `select`, not a confirmed Munin CPU loop, so a timing or event-loop patch would be speculative.
## Evidence Confidence
inferred
## Issue Connection
Fixer sampled `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` with native frames under `select`, a kernel stack in `poll_schedule_timeout`, and repeated `pselect6` calls. The same evidence also reports process state `S (sleeping)`, `wchan` as `poll_schedule_timeout.constprop.0`, only `0.9%` max CPU, and `pselect6` calls blocking for about `1.8-2.0s`.
The likely root cause is normal idle waiting in the `munin-node` server accept loop, not a proven script-level busy loop. The application entrypoint is `script/munin-node`, which delegates server operation to `Munin::Node::Server`; that module subclasses `Net::Server::Fork`, so the relevant accept-loop wait is owned by `Net::Server`. The local request and plugin paths already use Munin helpers such as `Munin::Common::Timeout::do_with_timeout`, `Munin::Common::Logger`, and `Munin::Node::OS` process helpers.
I followed the saved plan and made no source change. The expected effect is no runtime behavior change; this avoids landing a speculative timing/throttling patch without reproduced evidence or a Perl-level stack tying the sampled wait to Munin application logic.
## Git Add Paths
None
## Validation
`make` from the workspace root failed before building Munin because `Module::Build` is missing: `Can't locate Module/Build.pm in @INC ... at Build.PL line 80`.
`make test` failed for the same `Module::Build` dependency blocker.
`make -n check` confirmed there is no `check` target: `No rule to make target 'check'`.
Focused syntax checks:
`perl -Ilib -c lib/Munin/Common/Timeout.pm` passed.
`perl -Ilib -c lib/Munin/Node/OS.pm` passed, with redefinition warnings from the local/module load environment.
`perl -Ilib -c lib/Munin/Node/Server.pm` passed.
`perl -T -Ilib -c script/munin-node` passed.
Independent reproduction attempt:
`timeout -s INT 8s strace -ttT -f -e trace=pselect6,select,poll,ppoll,epoll_wait,nanosleep,clock_nanosleep ... perl -T -Ilib script/munin-node --foreground ...` was blocked by sandbox ptrace restrictions: `PTRACE_TRACEME: Operation not permitted`.
A non-ptrace foreground smoke run was also blocked from starting the server because binding a local TCP socket failed with `Operation not permitted`.
## Review Pass 1
RESULT: ok
No findings. The workspace has no source diff, `## Evidence Confidence` is valid and appropriately set to `inferred`, and the no-patch diagnosis matches the evidence limits: the captured process was sleeping in `pselect6` with low CPU rather than a reproduced Munin busy loop. Validation attempted the project-level entrypoints and reported exact blockers.perl likely remains stuck in a busy-poll loop. A diagnosis report and patch proposal were created locally.
## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.
## Patch Pass
You are working on a bounded fixer proposal.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Produce the smallest reasonable patch for the target repository, keep the change upstreamable, prefer the clearest control flow available, and do not keep avoidable `goto` when a simpler structure would read better. Before introducing new file, process, allocation, locking, networking, or platform APIs, inspect nearby code and project contribution docs for existing helpers or compatibility wrappers and use those local patterns unless you can explain why they do not fit. Validate from a reproducible workspace-root entrypoint before falling back to focused leaf commands; if a build or test cannot run, report the exact command, the exact blocker, and any narrower check you ran instead. During validation, also try one bounded independent reproduction of the collected failure signal when it is safe and cheap, such as a failing test, smoke command, perf/strace comparison, or before/after runtime check. Only use `reproduced` if that command or test actually reproduced the failure; otherwise keep `observed` and report the reproduction blocker. The final explanation must connect the observed issue evidence to the actual code change, not just paraphrase the diff. Write like a maintainer is going to read the patch mail cold: explain the bug in plain language, define subsystem-specific jargon the first time you need it, and make the causal story obvious. Explicitly classify evidence confidence as `reproduced`, `observed`, or `inferred`: `reproduced` means you reproduced the failure locally; `observed` means Fixer has direct crash/log/trace evidence but you did not independently reproduce it; `inferred` means the source patch is not pull-request-ready, so do not leave a source diff unless you first gather stronger observed/reproduced evidence; otherwise return a no-patch diagnosis/report. For any source-changing `observed` patch, say explicitly in `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. Security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior need reproduced evidence plus explicit security-impact analysis before leaving a source diff; otherwise return a no-patch diagnosis/report for human review. If you introduce non-obvious state translation, index remapping, or backend split logic, add a short source comment that explains the invariant being preserved.
Start by explaining the likely root cause from the collected perf, strace, and /proc evidence. If you cannot land a safe patch, leave a diagnosis that is strong enough for an upstream bug report.
Interpreter process expectation: when the hot process is Python, Perl, shell, Node, Ruby, PHP, Lua, or another interpreter, inspect both the runtime and the script/application entrypoint from `details.interpreter_process`. Prefer the script or application package when evidence points there; do not patch the interpreter runtime merely because the hot binary is `python`, `perl`, `bash`, or similar. Runtime fixes are welcome only after checking the entrypoint and explaining why the runtime mishandles the workload or why running bad code faster/safer is itself the right upstream fix.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Keep the change narrowly scoped and summarize validation clearly.
In every authoring pass, your final response must start with `Subject: <single-line git commit subject>` and then include these markdown sections exactly:
## Commit Message
A short upstream-friendly explanation of what changed and why. Write it in plain language that a maintainer can follow without local complaint context. If you use subsystem jargon, define it immediately.
## Evidence Confidence
Exactly one word: `reproduced`, `observed`, or `inferred`. Use `reproduced` only when you reproduced the failure locally with a command or test, and include that command/test in `## Validation`. Use `observed` when Fixer has direct crash/log/trace evidence but you did not independently reproduce it. If `## Git Add Paths` lists source files for an `observed` patch, `## Issue Connection` must explicitly say the failure was observed by Fixer and not independently reproduced. Security-sensitive source changes touching authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior require reproduced evidence and explicit security-impact analysis; otherwise list `None` under `## Git Add Paths` and write a no-patch diagnosis/report. Use `inferred` for profiler/strace/indirect evidence; inferred responses may be no-patch diagnoses or reports, but inferred source patches are not pull-request-ready until stronger evidence is gathered.
## Issue Connection
Write this as maintainer-facing patch mail, not as local Fixer notes. Cover four things explicitly in readable sentences: the user-visible symptom or the exact collected signal, the code-level cause or the cautious inference from evidence, the specific change you made, and the expected effect. Do not invent a reproducer, command line, crash, or user-visible failure that is not present in the evidence bundle. If the evidence is direct-but-not-reproduced, say it was observed by Fixer and not independently reproduced. If the evidence is indirect and you did not gather stronger evidence, do not leave a source diff; write a no-patch diagnosis/report instead. Include an explicit effect sentence such as `The expected effect is ...`, `This should reduce ...`, or `This prevents ...` for source patches. If the logic is non-obvious in code, mention that you added a short explanatory comment.
## Git Add Paths
List the repo-relative paths that belong in the final patch, one per line. Use `None` only when you intentionally made no source changes. Include intentionally new files, and do not list generated build artifacts.
## Validation
List the checks you ran, or say clearly that you could not run them. Include the independent reproduction command/test and result when `## Evidence Confidence` is `reproduced`; if reproduction was attempted but blocked, name the exact blocker and keep confidence at `observed` or `inferred`.
Before editing, read the plan at `./plan-output.txt` and follow it unless the code proves part of it wrong. If you change course, say so explicitly in the final write-up instead of silently drifting from the plan.
## Review Pass 1
You are reviewing a freshly generated fixer patch.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Review the first patch pass. The original pre-edit snapshot is available at `./source` for diffing.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout. The latest author response is at `./patch-output.txt`. Inspect the current code and changed paths like a strict code reviewer. Focus on correctness, regressions, maintainability, awkward control flow such as avoidable `goto`, missing validation, weak or non-gittable commit message text, and explanations that fail to connect the observed issue evidence to the code change. Also review the maintainer experience: the patch mail should be easy to accept upstream, the user-visible bug should be explained in plain language, subsystem-specific jargon should be defined when first used, and any non-obvious state translation or index remapping in code should have a short explanatory comment. Reject patches that omit `## Evidence Confidence`, use anything other than `reproduced`, `observed`, or `inferred`, or sound more certain than that evidence level allows. Reject patches that claim `reproduced` unless `## Validation` names the concrete reproduction command or test and its result. Reject source patches in security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior unless the author reproduced the behavior and explicitly analyzed the security impact of the change; observed-only evidence should become a diagnosis/report, not a PR-ready source diff. Reject patches that invent a reproducer, command line, crash, or user-visible failure not present in the evidence bundle; indirect profiler or strace evidence may justify a cautious mitigation, but the author must say it is indirect instead of presenting it as a confirmed upstream bug. Reject patches that introduce generic libc/std APIs when nearby code or project docs provide a local compat/helper API for the same job, unless the author explicitly justifies the exception. Reject validation that only reports a leaf object/syntax build when a project-level configure/build/test entrypoint exists and was not attempted; if a full build cannot run, the author must show the exact failed command and blocker.
Do not apply code changes in this pass.
Return a short markdown review report. The first non-empty line must be exactly one of:
RESULT: ok
RESULT: fix-needed
If you choose `RESULT: fix-needed`, add a `## Findings` section with concrete, actionable items.## Plan Pass
## Problem
Fixer observed `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` in `select`/`pselect6`, but the retained evidence does not tie the samples to a Munin Perl stack line or prove a tight loop. The JSON strace excerpt shows `pselect6` calls blocking for about 1.8-2.0 seconds, process state `S (sleeping)`, and only ~0.9% CPU, which is consistent with an idle `Net::Server::Fork` listener rather than a confirmed runaway loop.
## Evidence Confidence
inferred
## Proposed Subject
No source patch yet: report the munin-node busy-poll evidence as insufficient and collect a bounded reproduction before editing.
## Patch Plan
Do not edit files in this pass. A source patch would be premature because the evidence is profiler/native-backtrace-only and the raw artifact paths referenced by `evidence.json` are not currently present under `/var/lib/fixer/investigations`.
If a later reproduction shows `select` returning immediately in `munin-node`, inspect `script/munin-node` and `lib/Munin/Node/Server.pm` first, then patch upstream-style Perl code following `HACKING.pod`: `use strict`, `use warnings`, taint-compatible code, `English`, one statement per line, and local style. Avoid awkward control flow such as new `goto`; the node server already uses clean bounded loops in `_process_command_line`.
Relevant local conventions/helpers found: `Munin::Node::Server` subclasses `Net::Server::Fork`; request/plugin timing uses `Munin::Common::Timeout::do_with_timeout` and `Munin::Node::OS->run_as_child`. No relevant local helper for replacing the Net::Server idle listener was found. No prior Fixer patch was present; existing Debian patches are unrelated.
## Risks
Changing idle listener timing without reproducing a real spin could regress daemon responsiveness, signal handling, systemd foreground behavior, or Net::Server compatibility. Because this is timing/throttling-adjacent behavior, no source patch should be made without a reproduction and clear impact analysis.
## Validation
First try project-level validation from the workspace root: `make`. If `make check` is available, run `make check`; this tree’s Makefile appears to define `make test` rather than `check`, so use `make test` as the project test entrypoint if `make check` is absent.
Bounded independent reproduction before any edit: build/install enough local artifacts, then run `munin-node` in foreground with an empty temporary config/plugin tree under `strace` for a few seconds and verify whether `pselect6` blocks or returns immediately. If it blocks around the configured timeout and CPU stays low, report no patch; if it spins, capture the exact command, strace timing, and Perl-level stack before planning code changes.
## Patch Pass
Subject: Diagnose munin-node select samples without source changes
## Commit Message
No source change was made. The collected perf and `/proc` evidence points at a Perl `munin-node` process waiting in `select`/`pselect6`, but the retained strace excerpt shows waits lasting about two seconds, the process is `S (sleeping)`, and reported CPU is only 0.9%. That is more consistent with an idle `Net::Server::Fork` accept loop than with a proven busy poll.
## Evidence Confidence
inferred
## Issue Connection
Fixer collected native samples for `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` and classified repeated `pselect6` as a possible busy-poll loop. The strongest retained syscall evidence, however, shows `pselect6` timing out after about 1.8-2.0 seconds, not returning immediately.
The cautious code-level inference is that the observed wait is likely in `Munin::Node::Server`, which subclasses `Net::Server::Fork`, while `script/munin-node` simply configures services and calls `Munin::Node::Server->run`. Munin’s local timing helpers, `Munin::Common::Timeout::do_with_timeout` and `Munin::Node::OS->run_as_child`, cover accepted client requests and plugin child processes, not the idle server accept loop shown by the native frames. I also checked the Perl runtime as the secondary target (`perl` 5.40.1), but this Munin workspace does not contain Perl runtime source and the evidence does not show a runtime bug.
I followed the stored plan and left no diff. This is timing/throttling-adjacent behavior, and the local environment could not reproduce the failure signal strongly enough to justify an upstream source patch. The expected effect is no runtime change; this should instead be handled as an upstream bug report or a follow-up investigation with a Perl-level stack or unblocked syscall trace.
Style/convention notes: `CONTRIBUTING.md` points to `HACKING.pod`; relevant conventions are taint-compatible Perl, `use strict`, `use warnings`, `English`, one statement per line, and local style. No relevant local helper was found for replacing the Net::Server idle accept loop. Existing Debian patches are unrelated.
## Git Add Paths
None
## Validation
`make` from the workspace root failed before Munin code ran: `Can't locate Module/Build.pm in @INC ... at Build.PL line 80`, followed by `make: *** [Makefile:149: Build] Error 2`.
`make -n check` failed because this tree has no `check` target: `make: *** No rule to make target 'check'. Stop.`
`make test` hit the same missing dependency blocker as `make`: `Can't locate Module/Build.pm in @INC`.
Focused syntax check passed:
`perl -T -Ilib -c script/munin-node && perl -Ilib -c lib/Munin/Node/Server.pm && perl -Ilib -c lib/Munin/Node/OS.pm && perl -Ilib -c lib/Munin/Common/Timeout.pm`
The files reported `syntax OK`; `Munin::Node::OS` emitted existing subroutine redefinition warnings during compile.
Independent reproduction attempt:
`timeout 6s strace -ttT -f -o "$tmp/strace.log" -e trace=pselect6,select,poll,ppoll,epoll_wait,nanosleep,clock_nanosleep /usr/bin/perl -T -I"$PWD/lib" "$PWD/script/munin-node" ... --foreground`
was blocked by sandbox ptrace restrictions: `PTRACE_TRACEME: Operation not permitted` and `ptrace(PTRACE_SEIZE, 8): Operation not permitted`.
A non-strace foreground smoke with an empty temporary plugin tree also could not reach the idle loop because TCP bind is denied here: `Cannot bind and listen to TCP port 49492 on 127.0.0.1 [Operation not permitted]`.
The raw artifact path named in `evidence.json` was also unavailable locally (`test -e .../strace.log` returned exit code 1), so the diagnosis remains based on the JSON excerpts.
## Review Pass 1
RESULT: ok
The first patch pass correctly leaves the workspace unchanged. `git diff` is empty, `## Evidence Confidence` is `inferred`, and `## Git Add Paths` is `None`, which is appropriate for profiler/native stack evidence that does not prove a Munin source bug or reproduce the timing behavior locally.
The author response connects the evidence to the inspected `munin-node` entrypoint and `Munin::Node::Server`/`Net::Server::Fork` path, calls out the relevant local helpers (`Munin::Common::Timeout::do_with_timeout`, `Munin::Node::OS->run_as_child`), and does not overstate the retained `pselect6` trace. Validation is acceptable for a no-patch diagnosis: project-level `make` was attempted and blocked by missing `Module::Build`, `make check` absence was checked, a focused Perl syntax check was run, and the independent reproduction attempts clearly report ptrace and TCP bind blockers.perl likely remains stuck in a busy-poll loop. A diagnosis report and patch proposal were created locally.
## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.
## Patch Pass
You are working on a bounded fixer proposal.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Produce the smallest reasonable patch for the target repository, keep the change upstreamable, prefer the clearest control flow available, and do not keep avoidable `goto` when a simpler structure would read better. Before introducing new file, process, allocation, locking, networking, or platform APIs, inspect nearby code and project contribution docs for existing helpers or compatibility wrappers and use those local patterns unless you can explain why they do not fit. Validate from a reproducible workspace-root entrypoint before falling back to focused leaf commands; if a build or test cannot run, report the exact command, the exact blocker, and any narrower check you ran instead. During validation, also try one bounded independent reproduction of the collected failure signal when it is safe and cheap, such as a failing test, smoke command, perf/strace comparison, or before/after runtime check. Only use `reproduced` if that command or test actually reproduced the failure; otherwise keep `observed` and report the reproduction blocker. The final explanation must connect the observed issue evidence to the actual code change, not just paraphrase the diff. Write like a maintainer is going to read the patch mail cold: explain the bug in plain language, define subsystem-specific jargon the first time you need it, and make the causal story obvious. Explicitly classify evidence confidence as `reproduced`, `observed`, or `inferred`: `reproduced` means you reproduced the failure locally; `observed` means Fixer has direct crash/log/trace evidence but you did not independently reproduce it; `inferred` means the source patch is not pull-request-ready, so do not leave a source diff unless you first gather stronger observed/reproduced evidence; otherwise return a no-patch diagnosis/report. For any source-changing `observed` patch, say explicitly in `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. Security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior need reproduced evidence plus explicit security-impact analysis before leaving a source diff; otherwise return a no-patch diagnosis/report for human review. If you introduce non-obvious state translation, index remapping, or backend split logic, add a short source comment that explains the invariant being preserved.
Start by explaining the likely root cause from the collected perf, strace, and /proc evidence. If you cannot land a safe patch, leave a diagnosis that is strong enough for an upstream bug report.
Interpreter process expectation: when the hot process is Python, Perl, shell, Node, Ruby, PHP, Lua, or another interpreter, inspect both the runtime and the script/application entrypoint from `details.interpreter_process`. Prefer the script or application package when evidence points there; do not patch the interpreter runtime merely because the hot binary is `python`, `perl`, `bash`, or similar. Runtime fixes are welcome only after checking the entrypoint and explaining why the runtime mishandles the workload or why running bad code faster/safer is itself the right upstream fix.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Keep the change narrowly scoped and summarize validation clearly.
In every authoring pass, your final response must start with `Subject: <single-line git commit subject>` and then include these markdown sections exactly:
## Commit Message
A short upstream-friendly explanation of what changed and why. Write it in plain language that a maintainer can follow without local complaint context. If you use subsystem jargon, define it immediately.
## Evidence Confidence
Exactly one word: `reproduced`, `observed`, or `inferred`. Use `reproduced` only when you reproduced the failure locally with a command or test, and include that command/test in `## Validation`. Use `observed` when Fixer has direct crash/log/trace evidence but you did not independently reproduce it. If `## Git Add Paths` lists source files for an `observed` patch, `## Issue Connection` must explicitly say the failure was observed by Fixer and not independently reproduced. Security-sensitive source changes touching authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior require reproduced evidence and explicit security-impact analysis; otherwise list `None` under `## Git Add Paths` and write a no-patch diagnosis/report. Use `inferred` for profiler/strace/indirect evidence; inferred responses may be no-patch diagnoses or reports, but inferred source patches are not pull-request-ready until stronger evidence is gathered.
## Issue Connection
Write this as maintainer-facing patch mail, not as local Fixer notes. Cover four things explicitly in readable sentences: the user-visible symptom or the exact collected signal, the code-level cause or the cautious inference from evidence, the specific change you made, and the expected effect. Do not invent a reproducer, command line, crash, or user-visible failure that is not present in the evidence bundle. If the evidence is direct-but-not-reproduced, say it was observed by Fixer and not independently reproduced. If the evidence is indirect and you did not gather stronger evidence, do not leave a source diff; write a no-patch diagnosis/report instead. Include an explicit effect sentence such as `The expected effect is ...`, `This should reduce ...`, or `This prevents ...` for source patches. If the logic is non-obvious in code, mention that you added a short explanatory comment.
## Git Add Paths
List the repo-relative paths that belong in the final patch, one per line. Use `None` only when you intentionally made no source changes. Include intentionally new files, and do not list generated build artifacts.
## Validation
List the checks you ran, or say clearly that you could not run them. Include the independent reproduction command/test and result when `## Evidence Confidence` is `reproduced`; if reproduction was attempted but blocked, name the exact blocker and keep confidence at `observed` or `inferred`.
Before editing, read the plan at `./plan-output.txt` and follow it unless the code proves part of it wrong. If you change course, say so explicitly in the final write-up instead of silently drifting from the plan.
## Review Pass 1
You are reviewing a freshly generated fixer patch.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Review the first patch pass. The original pre-edit snapshot is available at `./source` for diffing.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout. The latest author response is at `./patch-output.txt`. Inspect the current code and changed paths like a strict code reviewer. Focus on correctness, regressions, maintainability, awkward control flow such as avoidable `goto`, missing validation, weak or non-gittable commit message text, and explanations that fail to connect the observed issue evidence to the code change. Also review the maintainer experience: the patch mail should be easy to accept upstream, the user-visible bug should be explained in plain language, subsystem-specific jargon should be defined when first used, and any non-obvious state translation or index remapping in code should have a short explanatory comment. Reject patches that omit `## Evidence Confidence`, use anything other than `reproduced`, `observed`, or `inferred`, or sound more certain than that evidence level allows. Reject patches that claim `reproduced` unless `## Validation` names the concrete reproduction command or test and its result. Reject source patches in security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior unless the author reproduced the behavior and explicitly analyzed the security impact of the change; observed-only evidence should become a diagnosis/report, not a PR-ready source diff. Reject patches that invent a reproducer, command line, crash, or user-visible failure not present in the evidence bundle; indirect profiler or strace evidence may justify a cautious mitigation, but the author must say it is indirect instead of presenting it as a confirmed upstream bug. Reject patches that introduce generic libc/std APIs when nearby code or project docs provide a local compat/helper API for the same job, unless the author explicitly justifies the exception. Reject validation that only reports a leaf object/syntax build when a project-level configure/build/test entrypoint exists and was not attempted; if a full build cannot run, the author must show the exact failed command and blocker.
Do not apply code changes in this pass.
Return a short markdown review report. The first non-empty line must be exactly one of:
RESULT: ok
RESULT: fix-needed
If you choose `RESULT: fix-needed`, add a `## Findings` section with concrete, actionable items.## Plan Pass
## Problem
Fixer observed `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` in `select`/`pselect6`, but the retained evidence does not tie the samples to a Munin Perl stack line or prove a tight loop. The JSON strace excerpt shows `pselect6` calls blocking for about 1.8-2.0 seconds, process state `S (sleeping)`, and only ~0.9% CPU, which is consistent with an idle `Net::Server::Fork` listener rather than a confirmed runaway loop.
## Evidence Confidence
inferred
## Proposed Subject
No source patch yet: report the munin-node busy-poll evidence as insufficient and collect a bounded reproduction before editing.
## Patch Plan
Do not edit files in this pass. A source patch would be premature because the evidence is profiler/native-backtrace-only and the raw artifact paths referenced by `evidence.json` are not currently present under `/var/lib/fixer/investigations`.
If a later reproduction shows `select` returning immediately in `munin-node`, inspect `script/munin-node` and `lib/Munin/Node/Server.pm` first, then patch upstream-style Perl code following `HACKING.pod`: `use strict`, `use warnings`, taint-compatible code, `English`, one statement per line, and local style. Avoid awkward control flow such as new `goto`; the node server already uses clean bounded loops in `_process_command_line`.
Relevant local conventions/helpers found: `Munin::Node::Server` subclasses `Net::Server::Fork`; request/plugin timing uses `Munin::Common::Timeout::do_with_timeout` and `Munin::Node::OS->run_as_child`. No relevant local helper for replacing the Net::Server idle listener was found. No prior Fixer patch was present; existing Debian patches are unrelated.
## Risks
Changing idle listener timing without reproducing a real spin could regress daemon responsiveness, signal handling, systemd foreground behavior, or Net::Server compatibility. Because this is timing/throttling-adjacent behavior, no source patch should be made without a reproduction and clear impact analysis.
## Validation
First try project-level validation from the workspace root: `make`. If `make check` is available, run `make check`; this tree’s Makefile appears to define `make test` rather than `check`, so use `make test` as the project test entrypoint if `make check` is absent.
Bounded independent reproduction before any edit: build/install enough local artifacts, then run `munin-node` in foreground with an empty temporary config/plugin tree under `strace` for a few seconds and verify whether `pselect6` blocks or returns immediately. If it blocks around the configured timeout and CPU stays low, report no patch; if it spins, capture the exact command, strace timing, and Perl-level stack before planning code changes.
## Patch Pass
Subject: Diagnose munin-node select samples without source changes
## Commit Message
No source change was made. The collected perf and `/proc` evidence points at a Perl `munin-node` process waiting in `select`/`pselect6`, but the retained strace excerpt shows waits lasting about two seconds, the process is `S (sleeping)`, and reported CPU is only 0.9%. That is more consistent with an idle `Net::Server::Fork` accept loop than with a proven busy poll.
## Evidence Confidence
inferred
## Issue Connection
Fixer collected native samples for `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` and classified repeated `pselect6` as a possible busy-poll loop. The strongest retained syscall evidence, however, shows `pselect6` timing out after about 1.8-2.0 seconds, not returning immediately.
The cautious code-level inference is that the observed wait is likely in `Munin::Node::Server`, which subclasses `Net::Server::Fork`, while `script/munin-node` simply configures services and calls `Munin::Node::Server->run`. Munin’s local timing helpers, `Munin::Common::Timeout::do_with_timeout` and `Munin::Node::OS->run_as_child`, cover accepted client requests and plugin child processes, not the idle server accept loop shown by the native frames. I also checked the Perl runtime as the secondary target (`perl` 5.40.1), but this Munin workspace does not contain Perl runtime source and the evidence does not show a runtime bug.
I followed the stored plan and left no diff. This is timing/throttling-adjacent behavior, and the local environment could not reproduce the failure signal strongly enough to justify an upstream source patch. The expected effect is no runtime change; this should instead be handled as an upstream bug report or a follow-up investigation with a Perl-level stack or unblocked syscall trace.
Style/convention notes: `CONTRIBUTING.md` points to `HACKING.pod`; relevant conventions are taint-compatible Perl, `use strict`, `use warnings`, `English`, one statement per line, and local style. No relevant local helper was found for replacing the Net::Server idle accept loop. Existing Debian patches are unrelated.
## Git Add Paths
None
## Validation
`make` from the workspace root failed before Munin code ran: `Can't locate Module/Build.pm in @INC ... at Build.PL line 80`, followed by `make: *** [Makefile:149: Build] Error 2`.
`make -n check` failed because this tree has no `check` target: `make: *** No rule to make target 'check'. Stop.`
`make test` hit the same missing dependency blocker as `make`: `Can't locate Module/Build.pm in @INC`.
Focused syntax check passed:
`perl -T -Ilib -c script/munin-node && perl -Ilib -c lib/Munin/Node/Server.pm && perl -Ilib -c lib/Munin/Node/OS.pm && perl -Ilib -c lib/Munin/Common/Timeout.pm`
The files reported `syntax OK`; `Munin::Node::OS` emitted existing subroutine redefinition warnings during compile.
Independent reproduction attempt:
`timeout 6s strace -ttT -f -o "$tmp/strace.log" -e trace=pselect6,select,poll,ppoll,epoll_wait,nanosleep,clock_nanosleep /usr/bin/perl -T -I"$PWD/lib" "$PWD/script/munin-node" ... --foreground`
was blocked by sandbox ptrace restrictions: `PTRACE_TRACEME: Operation not permitted` and `ptrace(PTRACE_SEIZE, 8): Operation not permitted`.
A non-strace foreground smoke with an empty temporary plugin tree also could not reach the idle loop because TCP bind is denied here: `Cannot bind and listen to TCP port 49492 on 127.0.0.1 [Operation not permitted]`.
The raw artifact path named in `evidence.json` was also unavailable locally (`test -e .../strace.log` returned exit code 1), so the diagnosis remains based on the JSON excerpts.
## Review Pass 1
RESULT: ok
The first patch pass correctly leaves the workspace unchanged. `git diff` is empty, `## Evidence Confidence` is `inferred`, and `## Git Add Paths` is `None`, which is appropriate for profiler/native stack evidence that does not prove a Munin source bug or reproduce the timing behavior locally.
The author response connects the evidence to the inspected `munin-node` entrypoint and `Munin::Node::Server`/`Net::Server::Fork` path, calls out the relevant local helpers (`Munin::Common::Timeout::do_with_timeout`, `Munin::Node::OS->run_as_child`), and does not overstate the retained `pselect6` trace. Validation is acceptable for a no-patch diagnosis: project-level `make` was attempted and blocked by missing `Module::Build`, `make check` absence was checked, a focused Perl syntax check was run, and the independent reproduction attempts clearly report ptrace and TCP bind blockers.perl likely remains stuck in a busy-poll loop. A diagnosis report and patch proposal were created locally.
## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.
## Patch Pass
You are working on a bounded fixer proposal.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Produce the smallest reasonable patch for the target repository, keep the change upstreamable, prefer the clearest control flow available, and do not keep avoidable `goto` when a simpler structure would read better. Before introducing new file, process, allocation, locking, networking, or platform APIs, inspect nearby code and project contribution docs for existing helpers or compatibility wrappers and use those local patterns unless you can explain why they do not fit. Validate from a reproducible workspace-root entrypoint before falling back to focused leaf commands; if a build or test cannot run, report the exact command, the exact blocker, and any narrower check you ran instead. During validation, also try one bounded independent reproduction of the collected failure signal when it is safe and cheap, such as a failing test, smoke command, perf/strace comparison, or before/after runtime check. Only use `reproduced` if that command or test actually reproduced the failure; otherwise keep `observed` and report the reproduction blocker. The final explanation must connect the observed issue evidence to the actual code change, not just paraphrase the diff. Write like a maintainer is going to read the patch mail cold: explain the bug in plain language, define subsystem-specific jargon the first time you need it, and make the causal story obvious. Explicitly classify evidence confidence as `reproduced`, `observed`, or `inferred`: `reproduced` means you reproduced the failure locally; `observed` means Fixer has direct crash/log/trace evidence but you did not independently reproduce it; `inferred` means the source patch is not pull-request-ready, so do not leave a source diff unless you first gather stronger observed/reproduced evidence; otherwise return a no-patch diagnosis/report. For any source-changing `observed` patch, say explicitly in `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. Security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior need reproduced evidence plus explicit security-impact analysis before leaving a source diff; otherwise return a no-patch diagnosis/report for human review. If you introduce non-obvious state translation, index remapping, or backend split logic, add a short source comment that explains the invariant being preserved.
Start by explaining the likely root cause from the collected perf, strace, and /proc evidence. If you cannot land a safe patch, leave a diagnosis that is strong enough for an upstream bug report.
Interpreter process expectation: when the hot process is Python, Perl, shell, Node, Ruby, PHP, Lua, or another interpreter, inspect both the runtime and the script/application entrypoint from `details.interpreter_process`. Prefer the script or application package when evidence points there; do not patch the interpreter runtime merely because the hot binary is `python`, `perl`, `bash`, or similar. Runtime fixes are welcome only after checking the entrypoint and explaining why the runtime mishandles the workload or why running bad code faster/safer is itself the right upstream fix.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Keep the change narrowly scoped and summarize validation clearly.
In every authoring pass, your final response must start with `Subject: <single-line git commit subject>` and then include these markdown sections exactly:
## Commit Message
A short upstream-friendly explanation of what changed and why. Write it in plain language that a maintainer can follow without local complaint context. If you use subsystem jargon, define it immediately.
## Evidence Confidence
Exactly one word: `reproduced`, `observed`, or `inferred`. Use `reproduced` only when you reproduced the failure locally with a command or test, and include that command/test in `## Validation`. Use `observed` when Fixer has direct crash/log/trace evidence but you did not independently reproduce it. If `## Git Add Paths` lists source files for an `observed` patch, `## Issue Connection` must explicitly say the failure was observed by Fixer and not independently reproduced. Security-sensitive source changes touching authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior require reproduced evidence and explicit security-impact analysis; otherwise list `None` under `## Git Add Paths` and write a no-patch diagnosis/report. Use `inferred` for profiler/strace/indirect evidence; inferred responses may be no-patch diagnoses or reports, but inferred source patches are not pull-request-ready until stronger evidence is gathered.
## Issue Connection
Write this as maintainer-facing patch mail, not as local Fixer notes. Cover four things explicitly in readable sentences: the user-visible symptom or the exact collected signal, the code-level cause or the cautious inference from evidence, the specific change you made, and the expected effect. Do not invent a reproducer, command line, crash, or user-visible failure that is not present in the evidence bundle. If the evidence is direct-but-not-reproduced, say it was observed by Fixer and not independently reproduced. If the evidence is indirect and you did not gather stronger evidence, do not leave a source diff; write a no-patch diagnosis/report instead. Include an explicit effect sentence such as `The expected effect is ...`, `This should reduce ...`, or `This prevents ...` for source patches. If the logic is non-obvious in code, mention that you added a short explanatory comment.
## Git Add Paths
List the repo-relative paths that belong in the final patch, one per line. Use `None` only when you intentionally made no source changes. Include intentionally new files, and do not list generated build artifacts.
## Validation
List the checks you ran, or say clearly that you could not run them. Include the independent reproduction command/test and result when `## Evidence Confidence` is `reproduced`; if reproduction was attempted but blocked, name the exact blocker and keep confidence at `observed` or `inferred`.
Before editing, read the plan at `./plan-output.txt` and follow it unless the code proves part of it wrong. If you change course, say so explicitly in the final write-up instead of silently drifting from the plan.
## Review Pass 1
You are reviewing a freshly generated fixer patch.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Review the first patch pass. The original pre-edit snapshot is available at `./source` for diffing.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout. The latest author response is at `./patch-output.txt`. Inspect the current code and changed paths like a strict code reviewer. Focus on correctness, regressions, maintainability, awkward control flow such as avoidable `goto`, missing validation, weak or non-gittable commit message text, and explanations that fail to connect the observed issue evidence to the code change. Also review the maintainer experience: the patch mail should be easy to accept upstream, the user-visible bug should be explained in plain language, subsystem-specific jargon should be defined when first used, and any non-obvious state translation or index remapping in code should have a short explanatory comment. Reject patches that omit `## Evidence Confidence`, use anything other than `reproduced`, `observed`, or `inferred`, or sound more certain than that evidence level allows. Reject patches that claim `reproduced` unless `## Validation` names the concrete reproduction command or test and its result. Reject source patches in security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior unless the author reproduced the behavior and explicitly analyzed the security impact of the change; observed-only evidence should become a diagnosis/report, not a PR-ready source diff. Reject patches that invent a reproducer, command line, crash, or user-visible failure not present in the evidence bundle; indirect profiler or strace evidence may justify a cautious mitigation, but the author must say it is indirect instead of presenting it as a confirmed upstream bug. Reject patches that introduce generic libc/std APIs when nearby code or project docs provide a local compat/helper API for the same job, unless the author explicitly justifies the exception. Reject validation that only reports a leaf object/syntax build when a project-level configure/build/test entrypoint exists and was not attempted; if a full build cannot run, the author must show the exact failed command and blocker.
Do not apply code changes in this pass.
Return a short markdown review report. The first non-empty line must be exactly one of:
RESULT: ok
RESULT: fix-needed
If you choose `RESULT: fix-needed`, add a `## Findings` section with concrete, actionable items.## Plan Pass
## Problem
Fixer flagged `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` as a likely busy-poll loop, but the retained evidence is not enough for an upstream source patch. The available trace shows `munin-node` sleeping in `pselect6` with ~1.8s/2.0s timeouts, process state `S`, `wchan=poll_schedule_timeout`, and only 0.9% CPU. No Perl-level stack or script line ties the samples to faulty Munin logic.
## Evidence Confidence
observed
## Proposed Subject
No source patch yet: document the evidence gap and collect a bounded reproduction/trace before changing Munin timing behavior.
## Patch Plan
- Do not edit in this pass. The evidence currently looks more like normal `Net::Server::Fork`/Perl socket waiting than a confirmed tight loop.
- If later evidence reproduces rapid zero/near-zero timeout polling, investigate `script/munin-node` -> `Munin::Node::Server::process_request` first, not Perl runtime.
- Follow local conventions from `CONTRIBUTING.md` and `HACKING.pod`: taint-compatible Perl, `use strict`, `use warnings`, `English`, one statement per line, existing file style.
- Use local helpers/conventions if a later patch is justified: `Munin::Common::Timeout::do_with_timeout`, `Munin::Common::Logger`, and existing `_net_read`/`_net_write` session wrappers. No separate local file-IO/path/process wrapper was relevant to this signal.
- Avoid awkward control flow such as `goto`; any future bounded fix should be a straightforward guard or timeout adjustment with clear logging.
- No prior Fixer patch for this issue was found in Debian patches or `.pc`.
## Risks
Changing `munin-node` polling/read timeout behavior is timing-sensitive and could affect legitimate long-lived master sessions, TLS negotiation, or slow plugin fetches. Because this touches timing/throttling behavior, a source patch should wait for a reproducible failure signal and security/operational impact analysis.
## Validation
Before any future patch, try the project entrypoints from the workspace root: `make`, then `make check` if that target exists. If project-level validation fails due to missing dependencies or generated files, record the exact command and failure.
Bounded independent reproduction before editing: build/generate files with `make`, run `munin-node` in foreground with a minimal temporary config and empty service directory, attach `strace -ttT -f -e trace=pselect6,select,poll,ppoll,epoll_wait,nanosleep,clock_nanosleep`, and verify whether calls return immediately in a tight loop or block for normal timeout intervals. Only claim `reproduced` if that command shows the busy-poll behavior.
## Patch Pass
Subject: Diagnose munin-node select wait evidence
## Commit Message
No source change is proposed. The collected evidence points to `munin-node` waiting in a normal `select`/`pselect6` sleep, not to a confirmed tight busy loop in Munin code. Because any fix would alter timing/throttling behavior, it needs a local reproduction and security-impact review before an upstreamable patch.
## Evidence Confidence
inferred
## Issue Connection
Fixer observed `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` in native Perl frames around `select`, with three `pselect6` calls in the trace. The important detail is that those calls blocked for about 1.8 and 2.0 seconds, while `/proc` showed state `S (sleeping)`, `wchan=poll_schedule_timeout`, and only 0.9% CPU.
The cautious code-level inference is that the sampled process was in `munin-node`’s normal server wait path, through `script/munin-node` and `Munin::Node::Server`, which uses `Net::Server::Fork`, `_net_read`/`_net_write`, `Munin::Common::Timeout::do_with_timeout`, and `Munin::Common::Logger`. I found no Perl-level stack, log, or reproducible command tying the samples to a Munin bug. No relevant prior Fixer patch was present in Debian patches or `.pc`.
I did not make a source change. This follows the saved plan; changing the read/select timeout path would be timing-sensitive and speculative without reproduction. The expected effect is that this proposal remains a diagnosis suitable for an upstream bug report instead of landing an unverified timing change.
## Git Add Paths
None
## Validation
- `make` from the workspace root failed before build: `Can't locate Module/Build.pm in @INC ... at Build.PL line 80`; `make: *** [Makefile:149: Build] Error 2`.
- `make check` failed because this source tree has no `check` target: `make: *** No rule to make target 'check'. Stop.`
- `perl -T -c -Ilib script/munin-node`: passed, `script/munin-node syntax OK`.
- `perl -c -Ilib lib/Munin/Node/Server.pm`: passed, `lib/Munin/Node/Server.pm syntax OK`.
- Independent strace reproduction attempt was blocked by sandbox ptrace restrictions: `PTRACE_TRACEME: Operation not permitted` and `ptrace(PTRACE_SEIZE, 10): Operation not permitted`.
- Non-strace foreground smoke attempt was also blocked by sandbox networking: `Cannot bind and listen to TCP port 14949 on 127.0.0.1 [Operation not permitted]`.
Local helper/style scan: `CONTRIBUTING.md` and `HACKING.pod` require taint-compatible Perl with `strict`, `warnings`, `English`, and existing file style. The relevant local helpers are `do_with_timeout`, `_net_read`/`_net_write`, and `Munin::Common::Logger`; no separate local file/path/process wrapper was relevant.
## Review Pass 1
RESULT: ok
No source diff is present in the workspace, and the saved author response correctly treats the evidence as insufficient for a timing/throttling source patch. It includes `## Evidence Confidence`, uses an allowed confidence value, reports project-level validation attempts and blockers, names the relevant Munin helpers/style conventions, and does not claim local reproduction.perl likely remains stuck in a busy-poll loop. A diagnosis report and patch proposal were created locally.
## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.
## Patch Pass
You are working on a bounded fixer proposal.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Produce the smallest reasonable patch for the target repository, keep the change upstreamable, prefer the clearest control flow available, and do not keep avoidable `goto` when a simpler structure would read better. Before introducing new file, process, allocation, locking, networking, or platform APIs, inspect nearby code and project contribution docs for existing helpers or compatibility wrappers and use those local patterns unless you can explain why they do not fit. Validate from a reproducible workspace-root entrypoint before falling back to focused leaf commands; if a build or test cannot run, report the exact command, the exact blocker, and any narrower check you ran instead. During validation, also try one bounded independent reproduction of the collected failure signal when it is safe and cheap, such as a failing test, smoke command, perf/strace comparison, or before/after runtime check. Only use `reproduced` if that command or test actually reproduced the failure; otherwise keep `observed` and report the reproduction blocker. The final explanation must connect the observed issue evidence to the actual code change, not just paraphrase the diff. Write like a maintainer is going to read the patch mail cold: explain the bug in plain language, define subsystem-specific jargon the first time you need it, and make the causal story obvious. Explicitly classify evidence confidence as `reproduced`, `observed`, or `inferred`: `reproduced` means you reproduced the failure locally; `observed` means Fixer has direct crash/log/trace evidence but you did not independently reproduce it; `inferred` means the source patch is not pull-request-ready, so do not leave a source diff unless you first gather stronger observed/reproduced evidence; otherwise return a no-patch diagnosis/report. For any source-changing `observed` patch, say explicitly in `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. Security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior need reproduced evidence plus explicit security-impact analysis before leaving a source diff; otherwise return a no-patch diagnosis/report for human review. If you introduce non-obvious state translation, index remapping, or backend split logic, add a short source comment that explains the invariant being preserved.
Start by explaining the likely root cause from the collected perf, strace, and /proc evidence. If you cannot land a safe patch, leave a diagnosis that is strong enough for an upstream bug report.
Interpreter process expectation: when the hot process is Python, Perl, shell, Node, Ruby, PHP, Lua, or another interpreter, inspect both the runtime and the script/application entrypoint from `details.interpreter_process`. Prefer the script or application package when evidence points there; do not patch the interpreter runtime merely because the hot binary is `python`, `perl`, `bash`, or similar. Runtime fixes are welcome only after checking the entrypoint and explaining why the runtime mishandles the workload or why running bad code faster/safer is itself the right upstream fix.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Keep the change narrowly scoped and summarize validation clearly.
In every authoring pass, your final response must start with `Subject: <single-line git commit subject>` and then include these markdown sections exactly:
## Commit Message
A short upstream-friendly explanation of what changed and why. Write it in plain language that a maintainer can follow without local complaint context. If you use subsystem jargon, define it immediately.
## Evidence Confidence
Exactly one word: `reproduced`, `observed`, or `inferred`. Use `reproduced` only when you reproduced the failure locally with a command or test, and include that command/test in `## Validation`. Use `observed` when Fixer has direct crash/log/trace evidence but you did not independently reproduce it. If `## Git Add Paths` lists source files for an `observed` patch, `## Issue Connection` must explicitly say the failure was observed by Fixer and not independently reproduced. Security-sensitive source changes touching authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior require reproduced evidence and explicit security-impact analysis; otherwise list `None` under `## Git Add Paths` and write a no-patch diagnosis/report. Use `inferred` for profiler/strace/indirect evidence; inferred responses may be no-patch diagnoses or reports, but inferred source patches are not pull-request-ready until stronger evidence is gathered.
## Issue Connection
Write this as maintainer-facing patch mail, not as local Fixer notes. Cover four things explicitly in readable sentences: the user-visible symptom or the exact collected signal, the code-level cause or the cautious inference from evidence, the specific change you made, and the expected effect. Do not invent a reproducer, command line, crash, or user-visible failure that is not present in the evidence bundle. If the evidence is direct-but-not-reproduced, say it was observed by Fixer and not independently reproduced. If the evidence is indirect and you did not gather stronger evidence, do not leave a source diff; write a no-patch diagnosis/report instead. Include an explicit effect sentence such as `The expected effect is ...`, `This should reduce ...`, or `This prevents ...` for source patches. If the logic is non-obvious in code, mention that you added a short explanatory comment.
## Git Add Paths
List the repo-relative paths that belong in the final patch, one per line. Use `None` only when you intentionally made no source changes. Include intentionally new files, and do not list generated build artifacts.
## Validation
List the checks you ran, or say clearly that you could not run them. Include the independent reproduction command/test and result when `## Evidence Confidence` is `reproduced`; if reproduction was attempted but blocked, name the exact blocker and keep confidence at `observed` or `inferred`.
Before editing, read the plan at `./plan-output.txt` and follow it unless the code proves part of it wrong. If you change course, say so explicitly in the final write-up instead of silently drifting from the plan.
## Review Pass 1
You are reviewing a freshly generated fixer patch.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Review the first patch pass. The original pre-edit snapshot is available at `./source` for diffing.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout. The latest author response is at `./patch-output.txt`. Inspect the current code and changed paths like a strict code reviewer. Focus on correctness, regressions, maintainability, awkward control flow such as avoidable `goto`, missing validation, weak or non-gittable commit message text, and explanations that fail to connect the observed issue evidence to the code change. Also review the maintainer experience: the patch mail should be easy to accept upstream, the user-visible bug should be explained in plain language, subsystem-specific jargon should be defined when first used, and any non-obvious state translation or index remapping in code should have a short explanatory comment. Reject patches that omit `## Evidence Confidence`, use anything other than `reproduced`, `observed`, or `inferred`, or sound more certain than that evidence level allows. Reject patches that claim `reproduced` unless `## Validation` names the concrete reproduction command or test and its result. Reject source patches in security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior unless the author reproduced the behavior and explicitly analyzed the security impact of the change; observed-only evidence should become a diagnosis/report, not a PR-ready source diff. Reject patches that invent a reproducer, command line, crash, or user-visible failure not present in the evidence bundle; indirect profiler or strace evidence may justify a cautious mitigation, but the author must say it is indirect instead of presenting it as a confirmed upstream bug. Reject patches that introduce generic libc/std APIs when nearby code or project docs provide a local compat/helper API for the same job, unless the author explicitly justifies the exception. Reject validation that only reports a leaf object/syntax build when a project-level configure/build/test entrypoint exists and was not attempted; if a full build cannot run, the author must show the exact failed command and blocker.
Do not apply code changes in this pass.
Return a short markdown review report. The first non-empty line must be exactly one of:
RESULT: ok
RESULT: fix-needed
If you choose `RESULT: fix-needed`, add a `## Findings` section with concrete, actionable items.## Plan Pass
## Problem
Fixer flagged `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` as a likely busy-poll loop, but the retained evidence is not enough for an upstream source patch. The available trace shows `munin-node` sleeping in `pselect6` with ~1.8s/2.0s timeouts, process state `S`, `wchan=poll_schedule_timeout`, and only 0.9% CPU. No Perl-level stack or script line ties the samples to faulty Munin logic.
## Evidence Confidence
observed
## Proposed Subject
No source patch yet: document the evidence gap and collect a bounded reproduction/trace before changing Munin timing behavior.
## Patch Plan
- Do not edit in this pass. The evidence currently looks more like normal `Net::Server::Fork`/Perl socket waiting than a confirmed tight loop.
- If later evidence reproduces rapid zero/near-zero timeout polling, investigate `script/munin-node` -> `Munin::Node::Server::process_request` first, not Perl runtime.
- Follow local conventions from `CONTRIBUTING.md` and `HACKING.pod`: taint-compatible Perl, `use strict`, `use warnings`, `English`, one statement per line, existing file style.
- Use local helpers/conventions if a later patch is justified: `Munin::Common::Timeout::do_with_timeout`, `Munin::Common::Logger`, and existing `_net_read`/`_net_write` session wrappers. No separate local file-IO/path/process wrapper was relevant to this signal.
- Avoid awkward control flow such as `goto`; any future bounded fix should be a straightforward guard or timeout adjustment with clear logging.
- No prior Fixer patch for this issue was found in Debian patches or `.pc`.
## Risks
Changing `munin-node` polling/read timeout behavior is timing-sensitive and could affect legitimate long-lived master sessions, TLS negotiation, or slow plugin fetches. Because this touches timing/throttling behavior, a source patch should wait for a reproducible failure signal and security/operational impact analysis.
## Validation
Before any future patch, try the project entrypoints from the workspace root: `make`, then `make check` if that target exists. If project-level validation fails due to missing dependencies or generated files, record the exact command and failure.
Bounded independent reproduction before editing: build/generate files with `make`, run `munin-node` in foreground with a minimal temporary config and empty service directory, attach `strace -ttT -f -e trace=pselect6,select,poll,ppoll,epoll_wait,nanosleep,clock_nanosleep`, and verify whether calls return immediately in a tight loop or block for normal timeout intervals. Only claim `reproduced` if that command shows the busy-poll behavior.
## Patch Pass
Subject: Diagnose munin-node select wait evidence
## Commit Message
No source change is proposed. The collected evidence points to `munin-node` waiting in a normal `select`/`pselect6` sleep, not to a confirmed tight busy loop in Munin code. Because any fix would alter timing/throttling behavior, it needs a local reproduction and security-impact review before an upstreamable patch.
## Evidence Confidence
inferred
## Issue Connection
Fixer observed `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` in native Perl frames around `select`, with three `pselect6` calls in the trace. The important detail is that those calls blocked for about 1.8 and 2.0 seconds, while `/proc` showed state `S (sleeping)`, `wchan=poll_schedule_timeout`, and only 0.9% CPU.
The cautious code-level inference is that the sampled process was in `munin-node`’s normal server wait path, through `script/munin-node` and `Munin::Node::Server`, which uses `Net::Server::Fork`, `_net_read`/`_net_write`, `Munin::Common::Timeout::do_with_timeout`, and `Munin::Common::Logger`. I found no Perl-level stack, log, or reproducible command tying the samples to a Munin bug. No relevant prior Fixer patch was present in Debian patches or `.pc`.
I did not make a source change. This follows the saved plan; changing the read/select timeout path would be timing-sensitive and speculative without reproduction. The expected effect is that this proposal remains a diagnosis suitable for an upstream bug report instead of landing an unverified timing change.
## Git Add Paths
None
## Validation
- `make` from the workspace root failed before build: `Can't locate Module/Build.pm in @INC ... at Build.PL line 80`; `make: *** [Makefile:149: Build] Error 2`.
- `make check` failed because this source tree has no `check` target: `make: *** No rule to make target 'check'. Stop.`
- `perl -T -c -Ilib script/munin-node`: passed, `script/munin-node syntax OK`.
- `perl -c -Ilib lib/Munin/Node/Server.pm`: passed, `lib/Munin/Node/Server.pm syntax OK`.
- Independent strace reproduction attempt was blocked by sandbox ptrace restrictions: `PTRACE_TRACEME: Operation not permitted` and `ptrace(PTRACE_SEIZE, 10): Operation not permitted`.
- Non-strace foreground smoke attempt was also blocked by sandbox networking: `Cannot bind and listen to TCP port 14949 on 127.0.0.1 [Operation not permitted]`.
Local helper/style scan: `CONTRIBUTING.md` and `HACKING.pod` require taint-compatible Perl with `strict`, `warnings`, `English`, and existing file style. The relevant local helpers are `do_with_timeout`, `_net_read`/`_net_write`, and `Munin::Common::Logger`; no separate local file/path/process wrapper was relevant.
## Review Pass 1
RESULT: ok
No source diff is present in the workspace, and the saved author response correctly treats the evidence as insufficient for a timing/throttling source patch. It includes `## Evidence Confidence`, uses an allowed confidence value, reports project-level validation attempts and blockers, names the relevant Munin helpers/style conventions, and does not claim local reproduction.perl likely remains stuck in a busy-poll loop. A diagnosis report and patch proposal were created locally.
## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.
## Patch Pass
You are working on a bounded fixer proposal.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Produce the smallest reasonable patch for the target repository, keep the change upstreamable, prefer the clearest control flow available, and do not keep avoidable `goto` when a simpler structure would read better. Before introducing new file, process, allocation, locking, networking, or platform APIs, inspect nearby code and project contribution docs for existing helpers or compatibility wrappers and use those local patterns unless you can explain why they do not fit. Validate from a reproducible workspace-root entrypoint before falling back to focused leaf commands; if a build or test cannot run, report the exact command, the exact blocker, and any narrower check you ran instead. During validation, also try one bounded independent reproduction of the collected failure signal when it is safe and cheap, such as a failing test, smoke command, perf/strace comparison, or before/after runtime check. Only use `reproduced` if that command or test actually reproduced the failure; otherwise keep `observed` and report the reproduction blocker. The final explanation must connect the observed issue evidence to the actual code change, not just paraphrase the diff. Write like a maintainer is going to read the patch mail cold: explain the bug in plain language, define subsystem-specific jargon the first time you need it, and make the causal story obvious. Explicitly classify evidence confidence as `reproduced`, `observed`, or `inferred`: `reproduced` means you reproduced the failure locally; `observed` means Fixer has direct crash/log/trace evidence but you did not independently reproduce it; `inferred` means the source patch is not pull-request-ready, so do not leave a source diff unless you first gather stronger observed/reproduced evidence; otherwise return a no-patch diagnosis/report. For any source-changing `observed` patch, say explicitly in `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. Security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior need reproduced evidence plus explicit security-impact analysis before leaving a source diff; otherwise return a no-patch diagnosis/report for human review. If you introduce non-obvious state translation, index remapping, or backend split logic, add a short source comment that explains the invariant being preserved.
Start by explaining the likely root cause from the collected perf, strace, and /proc evidence. If you cannot land a safe patch, leave a diagnosis that is strong enough for an upstream bug report.
Interpreter process expectation: when the hot process is Python, Perl, shell, Node, Ruby, PHP, Lua, or another interpreter, inspect both the runtime and the script/application entrypoint from `details.interpreter_process`. Prefer the script or application package when evidence points there; do not patch the interpreter runtime merely because the hot binary is `python`, `perl`, `bash`, or similar. Runtime fixes are welcome only after checking the entrypoint and explaining why the runtime mishandles the workload or why running bad code faster/safer is itself the right upstream fix.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Keep the change narrowly scoped and summarize validation clearly.
In every authoring pass, your final response must start with `Subject: <single-line git commit subject>` and then include these markdown sections exactly:
## Commit Message
A short upstream-friendly explanation of what changed and why. Write it in plain language that a maintainer can follow without local complaint context. If you use subsystem jargon, define it immediately.
## Evidence Confidence
Exactly one word: `reproduced`, `observed`, or `inferred`. Use `reproduced` only when you reproduced the failure locally with a command or test, and include that command/test in `## Validation`. Use `observed` when Fixer has direct crash/log/trace evidence but you did not independently reproduce it. If `## Git Add Paths` lists source files for an `observed` patch, `## Issue Connection` must explicitly say the failure was observed by Fixer and not independently reproduced. Security-sensitive source changes touching authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior require reproduced evidence and explicit security-impact analysis; otherwise list `None` under `## Git Add Paths` and write a no-patch diagnosis/report. Use `inferred` for profiler/strace/indirect evidence; inferred responses may be no-patch diagnoses or reports, but inferred source patches are not pull-request-ready until stronger evidence is gathered.
## Issue Connection
Write this as maintainer-facing patch mail, not as local Fixer notes. Cover four things explicitly in readable sentences: the user-visible symptom or the exact collected signal, the code-level cause or the cautious inference from evidence, the specific change you made, and the expected effect. Do not invent a reproducer, command line, crash, or user-visible failure that is not present in the evidence bundle. If the evidence is direct-but-not-reproduced, say it was observed by Fixer and not independently reproduced. If the evidence is indirect and you did not gather stronger evidence, do not leave a source diff; write a no-patch diagnosis/report instead. Include an explicit effect sentence such as `The expected effect is ...`, `This should reduce ...`, or `This prevents ...` for source patches. If the logic is non-obvious in code, mention that you added a short explanatory comment.
## Git Add Paths
List the repo-relative paths that belong in the final patch, one per line. Use `None` only when you intentionally made no source changes. Include intentionally new files, and do not list generated build artifacts.
## Validation
List the checks you ran, or say clearly that you could not run them. Include the independent reproduction command/test and result when `## Evidence Confidence` is `reproduced`; if reproduction was attempted but blocked, name the exact blocker and keep confidence at `observed` or `inferred`.
Before editing, read the plan at `./plan-output.txt` and follow it unless the code proves part of it wrong. If you change course, say so explicitly in the final write-up instead of silently drifting from the plan.
## Review Pass 1
You are reviewing a freshly generated fixer patch.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Review the first patch pass. The original pre-edit snapshot is available at `./source` for diffing.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout. The latest author response is at `./patch-output.txt`. Inspect the current code and changed paths like a strict code reviewer. Focus on correctness, regressions, maintainability, awkward control flow such as avoidable `goto`, missing validation, weak or non-gittable commit message text, and explanations that fail to connect the observed issue evidence to the code change. Also review the maintainer experience: the patch mail should be easy to accept upstream, the user-visible bug should be explained in plain language, subsystem-specific jargon should be defined when first used, and any non-obvious state translation or index remapping in code should have a short explanatory comment. Reject patches that omit `## Evidence Confidence`, use anything other than `reproduced`, `observed`, or `inferred`, or sound more certain than that evidence level allows. Reject patches that claim `reproduced` unless `## Validation` names the concrete reproduction command or test and its result. Reject source patches in security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior unless the author reproduced the behavior and explicitly analyzed the security impact of the change; observed-only evidence should become a diagnosis/report, not a PR-ready source diff. Reject patches that invent a reproducer, command line, crash, or user-visible failure not present in the evidence bundle; indirect profiler or strace evidence may justify a cautious mitigation, but the author must say it is indirect instead of presenting it as a confirmed upstream bug. Reject patches that introduce generic libc/std APIs when nearby code or project docs provide a local compat/helper API for the same job, unless the author explicitly justifies the exception. Reject validation that only reports a leaf object/syntax build when a project-level configure/build/test entrypoint exists and was not attempted; if a full build cannot run, the author must show the exact failed command and blocker.
Do not apply code changes in this pass.
Return a short markdown review report. The first non-empty line must be exactly one of:
RESULT: ok
RESULT: fix-needed
If you choose `RESULT: fix-needed`, add a `## Findings` section with concrete, actionable items.## Plan Pass
## Problem
Fixer observed `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` in `pselect6`/`select`, but the retained evidence does not tie the wait to a Munin source line or prove a tight CPU loop. The strace excerpt shows sleeps of about 1.8s and 2.0s, process state was `S (sleeping)`, and sampled CPU was only 0.9%, which is consistent with an idle Net::Server-based daemon wait rather than a confirmed runaway loop.
## Evidence Confidence
inferred
## Proposed Subject
No source patch yet: diagnose the Munin-node poll-loop report as insufficiently tied to a Munin bug, and collect stronger runtime evidence before editing.
## Patch Plan
Do not patch `perl-base`; the evidence names `/usr/sbin/munin-node` as the script entrypoint and explicitly says the Perl runtime was not proven faulty.
Do not patch Munin source from the current evidence alone. Inspecting `script/munin-node` and `lib/Munin/Node/Server.pm` shows Munin delegates daemon behavior to `Net::Server::Fork`, reads requests via `_net_read`, and wraps request handling with the local `Munin::Common::Timeout::do_with_timeout` helper. The observed `pselect6(..., timeout ~= 2s)` signal is plausibly Net::Server idle polling, not a demonstrated busy loop.
If stronger evidence is collected later, keep any change local to the node server path and follow Munin conventions from `CONTRIBUTING.md`/`HACKING.pod`: taint mode compatibility, `use strict; use warnings;`, clear English variables, existing logging through `Munin::Common::Logger`, and existing timeout behavior through `Munin::Common::Timeout`. No relevant local file-IO/process wrapper is implicated beyond these helpers. Avoid awkward control flow such as new `goto`; this path can be handled with bounded conditionals if a real bug is found.
No prior Fixer patch was found to improve or replace. Existing Debian quilt patches appear unrelated to this node idle wait report.
## Risks
A speculative source patch could change daemon accept/read timing, TLS session handling, or Net::Server lifecycle behavior without proving a user-visible Munin defect.
Because the report involves timing/polling behavior, a patch should only proceed after an independent reproduction shows excess wakeups or CPU and identifies whether the wakeups come from Munin code, Net::Server, or the Perl/runtime layer.
## Validation
Project-level validation attempted from workspace root:
`make` failed before building because `Module::Build` is missing:
`Can't locate Module/Build.pm in @INC ... at Build.PL line 80.`
`make check` failed because the tree has no `check` target:
`make: *** No rule to make target 'check'. Stop.`
Focused checks run without edits:
`perl -T -Ilib -c script/munin-node` passed syntax check.
`perl -Ilib -c lib/Munin/Node/Server.pm` passed syntax check.
`perl -Ilib -c lib/Munin/Common/Timeout.pm` passed syntax check.
Before any future patch, run one bounded independent reproduction attempt such as starting `munin-node --foreground` with a test config under `timeout` and tracing `pselect6/select` wake frequency with `strace -ttT -f -e trace=pselect6,select,poll,ppoll`. Only claim `reproduced` if that command shows frequent non-blocking wakeups or sustained CPU, not merely 2-second idle waits.
## Patch Pass
Subject: No patch: diagnose munin-node select wait evidence
## Commit Message
No source change. The collected data shows `munin-node` sleeping in a timed `select`/`pselect6` wait, but it does not tie the wait to a Munin source bug or reproduce a busy loop. The safest upstream action is to report the evidence gap and request a language-level stack or reproducible trace before changing daemon timing behavior.
## Evidence Confidence
inferred
## Issue Connection
The collected signal is `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` sampled in Perl/native `select` frames, with `/proc` showing `State: S (sleeping)` and `wchan: poll_schedule_timeout.constprop.0`. The strace excerpt contains three `pselect6` calls over five seconds, with waits of about 1.8 and 2.0 seconds, and the process CPU sample was only 0.9%.
The likely root cause is not a proved runaway loop in Perl or Munin. It is more likely that an idle `munin-node` daemon, implemented through `Net::Server::Fork`, was waiting for socket activity and was classified as a busy poll because the stack repeatedly reached a poll-family syscall. I inspected the script entrypoint and runtime context: `script/munin-node` delegates to `Munin::Node::Server`, while request handling uses `_net_read`, `Munin::Common::Timeout::do_with_timeout`, and `Munin::Common::Logger`. The Perl runtime frames are consistent with Perl executing the wait, but the evidence does not show Perl mishandling it.
I made no source change. This follows the saved plan because the issue touches timing behavior and the evidence is profiler/strace-based without an independent reproduction or source-level stack. The expected effect is no behavior change; the report remains a triage-ready upstream diagnosis rather than a speculative patch that could alter daemon accept/read timing.
Local conventions checked: `CONTRIBUTING.md` and `HACKING.pod` require taint-compatible Perl with `use strict; use warnings;`, clear English variables, existing style in touched files, and relevant local helpers. The relevant helpers/conventions found were `Munin::Common::Timeout::do_with_timeout`, `Munin::Common::Logger`, and the existing `Net::Server::Fork` daemon structure. No new file, process, locking, networking, or platform API was introduced.
## Git Add Paths
None
## Validation
`make` from the workspace root failed before building because `Module::Build` is missing:
`Can't locate Module/Build.pm in @INC ... at Build.PL line 80.`
`make: *** [Makefile:149: Build] Error 2`
`make check` from the workspace root failed because no such target exists:
`make: *** No rule to make target 'check'. Stop.`
Focused checks:
`perl -Ilib -c lib/Munin/Node/Server.pm` passed.
`perl -Ilib -c lib/Munin/Common/Timeout.pm` passed.
`perl -T -Ilib -c script/munin-node` passed.
Bounded independent reproduction attempt:
`timeout 6s strace -ttT -f -e trace=pselect6,select,poll,ppoll,epoll_wait,nanosleep,clock_nanosleep perl -T -Ilib script/munin-node --foreground --config t/config/munin-node.conf --servicedir /tmp/munin-fixer-empty-services --sconfdir /tmp/munin-fixer-empty-sconf` could not run because ptrace is blocked: `PTRACE_TRACEME: Operation not permitted` and `ptrace(PTRACE_SEIZE, 5): Operation not permitted`.
The exact installed evidence command also could not be replayed here:
`timeout 6s /usr/bin/perl -wT /usr/sbin/munin-node --foreground` failed with `Can't open perl script "/usr/sbin/munin-node": No such file or directory`.
I did not reproduce the reported failure locally.
## Review Pass 1
RESULT: ok
No source diff is present, and the no-patch diagnosis is consistent with the evidence level. The author correctly classifies confidence as `inferred`, avoids a timing/daemon behavior source change without reproduction, checks the Perl entrypoint instead of blaming the runtime, and reports project-level validation blockers before focused syntax checks.
The report also names relevant Munin conventions/helpers (`CONTRIBUTING.md`, `HACKING.pod`, `Net::Server::Fork`, `Munin::Common::Timeout::do_with_timeout`, `Munin::Common::Logger`) and does not invent a user-visible failure beyond the collected perf/strace/proc evidence.perl likely remains stuck in a busy-poll loop. A diagnosis report and patch proposal were created locally.
## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.
## Patch Pass
You are working on a bounded fixer proposal.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Produce the smallest reasonable patch for the target repository, keep the change upstreamable, prefer the clearest control flow available, and do not keep avoidable `goto` when a simpler structure would read better. Before introducing new file, process, allocation, locking, networking, or platform APIs, inspect nearby code and project contribution docs for existing helpers or compatibility wrappers and use those local patterns unless you can explain why they do not fit. Validate from a reproducible workspace-root entrypoint before falling back to focused leaf commands; if a build or test cannot run, report the exact command, the exact blocker, and any narrower check you ran instead. During validation, also try one bounded independent reproduction of the collected failure signal when it is safe and cheap, such as a failing test, smoke command, perf/strace comparison, or before/after runtime check. Only use `reproduced` if that command or test actually reproduced the failure; otherwise keep `observed` and report the reproduction blocker. The final explanation must connect the observed issue evidence to the actual code change, not just paraphrase the diff. Write like a maintainer is going to read the patch mail cold: explain the bug in plain language, define subsystem-specific jargon the first time you need it, and make the causal story obvious. Explicitly classify evidence confidence as `reproduced`, `observed`, or `inferred`: `reproduced` means you reproduced the failure locally; `observed` means Fixer has direct crash/log/trace evidence but you did not independently reproduce it; `inferred` means the source patch is not pull-request-ready, so do not leave a source diff unless you first gather stronger observed/reproduced evidence; otherwise return a no-patch diagnosis/report. For any source-changing `observed` patch, say explicitly in `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. Security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior need reproduced evidence plus explicit security-impact analysis before leaving a source diff; otherwise return a no-patch diagnosis/report for human review. If you introduce non-obvious state translation, index remapping, or backend split logic, add a short source comment that explains the invariant being preserved.
Start by explaining the likely root cause from the collected perf, strace, and /proc evidence. If you cannot land a safe patch, leave a diagnosis that is strong enough for an upstream bug report.
Interpreter process expectation: when the hot process is Python, Perl, shell, Node, Ruby, PHP, Lua, or another interpreter, inspect both the runtime and the script/application entrypoint from `details.interpreter_process`. Prefer the script or application package when evidence points there; do not patch the interpreter runtime merely because the hot binary is `python`, `perl`, `bash`, or similar. Runtime fixes are welcome only after checking the entrypoint and explaining why the runtime mishandles the workload or why running bad code faster/safer is itself the right upstream fix.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Keep the change narrowly scoped and summarize validation clearly.
In every authoring pass, your final response must start with `Subject: <single-line git commit subject>` and then include these markdown sections exactly:
## Commit Message
A short upstream-friendly explanation of what changed and why. Write it in plain language that a maintainer can follow without local complaint context. If you use subsystem jargon, define it immediately.
## Evidence Confidence
Exactly one word: `reproduced`, `observed`, or `inferred`. Use `reproduced` only when you reproduced the failure locally with a command or test, and include that command/test in `## Validation`. Use `observed` when Fixer has direct crash/log/trace evidence but you did not independently reproduce it. If `## Git Add Paths` lists source files for an `observed` patch, `## Issue Connection` must explicitly say the failure was observed by Fixer and not independently reproduced. Security-sensitive source changes touching authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior require reproduced evidence and explicit security-impact analysis; otherwise list `None` under `## Git Add Paths` and write a no-patch diagnosis/report. Use `inferred` for profiler/strace/indirect evidence; inferred responses may be no-patch diagnoses or reports, but inferred source patches are not pull-request-ready until stronger evidence is gathered.
## Issue Connection
Write this as maintainer-facing patch mail, not as local Fixer notes. Cover four things explicitly in readable sentences: the user-visible symptom or the exact collected signal, the code-level cause or the cautious inference from evidence, the specific change you made, and the expected effect. Do not invent a reproducer, command line, crash, or user-visible failure that is not present in the evidence bundle. If the evidence is direct-but-not-reproduced, say it was observed by Fixer and not independently reproduced. If the evidence is indirect and you did not gather stronger evidence, do not leave a source diff; write a no-patch diagnosis/report instead. Include an explicit effect sentence such as `The expected effect is ...`, `This should reduce ...`, or `This prevents ...` for source patches. If the logic is non-obvious in code, mention that you added a short explanatory comment.
## Git Add Paths
List the repo-relative paths that belong in the final patch, one per line. Use `None` only when you intentionally made no source changes. Include intentionally new files, and do not list generated build artifacts.
## Validation
List the checks you ran, or say clearly that you could not run them. Include the independent reproduction command/test and result when `## Evidence Confidence` is `reproduced`; if reproduction was attempted but blocked, name the exact blocker and keep confidence at `observed` or `inferred`.
Before editing, read the plan at `./plan-output.txt` and follow it unless the code proves part of it wrong. If you change course, say so explicitly in the final write-up instead of silently drifting from the plan.
## Review Pass 1
You are reviewing a freshly generated fixer patch.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Review the first patch pass. The original pre-edit snapshot is available at `./source` for diffing.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout. The latest author response is at `./patch-output.txt`. Inspect the current code and changed paths like a strict code reviewer. Focus on correctness, regressions, maintainability, awkward control flow such as avoidable `goto`, missing validation, weak or non-gittable commit message text, and explanations that fail to connect the observed issue evidence to the code change. Also review the maintainer experience: the patch mail should be easy to accept upstream, the user-visible bug should be explained in plain language, subsystem-specific jargon should be defined when first used, and any non-obvious state translation or index remapping in code should have a short explanatory comment. Reject patches that omit `## Evidence Confidence`, use anything other than `reproduced`, `observed`, or `inferred`, or sound more certain than that evidence level allows. Reject patches that claim `reproduced` unless `## Validation` names the concrete reproduction command or test and its result. Reject source patches in security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior unless the author reproduced the behavior and explicitly analyzed the security impact of the change; observed-only evidence should become a diagnosis/report, not a PR-ready source diff. Reject patches that invent a reproducer, command line, crash, or user-visible failure not present in the evidence bundle; indirect profiler or strace evidence may justify a cautious mitigation, but the author must say it is indirect instead of presenting it as a confirmed upstream bug. Reject patches that introduce generic libc/std APIs when nearby code or project docs provide a local compat/helper API for the same job, unless the author explicitly justifies the exception. Reject validation that only reports a leaf object/syntax build when a project-level configure/build/test entrypoint exists and was not attempted; if a full build cannot run, the author must show the exact failed command and blocker.
Do not apply code changes in this pass.
Return a short markdown review report. The first non-empty line must be exactly one of:
RESULT: ok
RESULT: fix-needed
If you choose `RESULT: fix-needed`, add a `## Findings` section with concrete, actionable items.## Plan Pass
## Problem
Fixer observed `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` in `pselect6`/`select`, but the retained evidence does not tie the wait to a Munin source line or prove a tight CPU loop. The strace excerpt shows sleeps of about 1.8s and 2.0s, process state was `S (sleeping)`, and sampled CPU was only 0.9%, which is consistent with an idle Net::Server-based daemon wait rather than a confirmed runaway loop.
## Evidence Confidence
inferred
## Proposed Subject
No source patch yet: diagnose the Munin-node poll-loop report as insufficiently tied to a Munin bug, and collect stronger runtime evidence before editing.
## Patch Plan
Do not patch `perl-base`; the evidence names `/usr/sbin/munin-node` as the script entrypoint and explicitly says the Perl runtime was not proven faulty.
Do not patch Munin source from the current evidence alone. Inspecting `script/munin-node` and `lib/Munin/Node/Server.pm` shows Munin delegates daemon behavior to `Net::Server::Fork`, reads requests via `_net_read`, and wraps request handling with the local `Munin::Common::Timeout::do_with_timeout` helper. The observed `pselect6(..., timeout ~= 2s)` signal is plausibly Net::Server idle polling, not a demonstrated busy loop.
If stronger evidence is collected later, keep any change local to the node server path and follow Munin conventions from `CONTRIBUTING.md`/`HACKING.pod`: taint mode compatibility, `use strict; use warnings;`, clear English variables, existing logging through `Munin::Common::Logger`, and existing timeout behavior through `Munin::Common::Timeout`. No relevant local file-IO/process wrapper is implicated beyond these helpers. Avoid awkward control flow such as new `goto`; this path can be handled with bounded conditionals if a real bug is found.
No prior Fixer patch was found to improve or replace. Existing Debian quilt patches appear unrelated to this node idle wait report.
## Risks
A speculative source patch could change daemon accept/read timing, TLS session handling, or Net::Server lifecycle behavior without proving a user-visible Munin defect.
Because the report involves timing/polling behavior, a patch should only proceed after an independent reproduction shows excess wakeups or CPU and identifies whether the wakeups come from Munin code, Net::Server, or the Perl/runtime layer.
## Validation
Project-level validation attempted from workspace root:
`make` failed before building because `Module::Build` is missing:
`Can't locate Module/Build.pm in @INC ... at Build.PL line 80.`
`make check` failed because the tree has no `check` target:
`make: *** No rule to make target 'check'. Stop.`
Focused checks run without edits:
`perl -T -Ilib -c script/munin-node` passed syntax check.
`perl -Ilib -c lib/Munin/Node/Server.pm` passed syntax check.
`perl -Ilib -c lib/Munin/Common/Timeout.pm` passed syntax check.
Before any future patch, run one bounded independent reproduction attempt such as starting `munin-node --foreground` with a test config under `timeout` and tracing `pselect6/select` wake frequency with `strace -ttT -f -e trace=pselect6,select,poll,ppoll`. Only claim `reproduced` if that command shows frequent non-blocking wakeups or sustained CPU, not merely 2-second idle waits.
## Patch Pass
Subject: No patch: diagnose munin-node select wait evidence
## Commit Message
No source change. The collected data shows `munin-node` sleeping in a timed `select`/`pselect6` wait, but it does not tie the wait to a Munin source bug or reproduce a busy loop. The safest upstream action is to report the evidence gap and request a language-level stack or reproducible trace before changing daemon timing behavior.
## Evidence Confidence
inferred
## Issue Connection
The collected signal is `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` sampled in Perl/native `select` frames, with `/proc` showing `State: S (sleeping)` and `wchan: poll_schedule_timeout.constprop.0`. The strace excerpt contains three `pselect6` calls over five seconds, with waits of about 1.8 and 2.0 seconds, and the process CPU sample was only 0.9%.
The likely root cause is not a proved runaway loop in Perl or Munin. It is more likely that an idle `munin-node` daemon, implemented through `Net::Server::Fork`, was waiting for socket activity and was classified as a busy poll because the stack repeatedly reached a poll-family syscall. I inspected the script entrypoint and runtime context: `script/munin-node` delegates to `Munin::Node::Server`, while request handling uses `_net_read`, `Munin::Common::Timeout::do_with_timeout`, and `Munin::Common::Logger`. The Perl runtime frames are consistent with Perl executing the wait, but the evidence does not show Perl mishandling it.
I made no source change. This follows the saved plan because the issue touches timing behavior and the evidence is profiler/strace-based without an independent reproduction or source-level stack. The expected effect is no behavior change; the report remains a triage-ready upstream diagnosis rather than a speculative patch that could alter daemon accept/read timing.
Local conventions checked: `CONTRIBUTING.md` and `HACKING.pod` require taint-compatible Perl with `use strict; use warnings;`, clear English variables, existing style in touched files, and relevant local helpers. The relevant helpers/conventions found were `Munin::Common::Timeout::do_with_timeout`, `Munin::Common::Logger`, and the existing `Net::Server::Fork` daemon structure. No new file, process, locking, networking, or platform API was introduced.
## Git Add Paths
None
## Validation
`make` from the workspace root failed before building because `Module::Build` is missing:
`Can't locate Module/Build.pm in @INC ... at Build.PL line 80.`
`make: *** [Makefile:149: Build] Error 2`
`make check` from the workspace root failed because no such target exists:
`make: *** No rule to make target 'check'. Stop.`
Focused checks:
`perl -Ilib -c lib/Munin/Node/Server.pm` passed.
`perl -Ilib -c lib/Munin/Common/Timeout.pm` passed.
`perl -T -Ilib -c script/munin-node` passed.
Bounded independent reproduction attempt:
`timeout 6s strace -ttT -f -e trace=pselect6,select,poll,ppoll,epoll_wait,nanosleep,clock_nanosleep perl -T -Ilib script/munin-node --foreground --config t/config/munin-node.conf --servicedir /tmp/munin-fixer-empty-services --sconfdir /tmp/munin-fixer-empty-sconf` could not run because ptrace is blocked: `PTRACE_TRACEME: Operation not permitted` and `ptrace(PTRACE_SEIZE, 5): Operation not permitted`.
The exact installed evidence command also could not be replayed here:
`timeout 6s /usr/bin/perl -wT /usr/sbin/munin-node --foreground` failed with `Can't open perl script "/usr/sbin/munin-node": No such file or directory`.
I did not reproduce the reported failure locally.
## Review Pass 1
RESULT: ok
No source diff is present, and the no-patch diagnosis is consistent with the evidence level. The author correctly classifies confidence as `inferred`, avoids a timing/daemon behavior source change without reproduction, checks the Perl entrypoint instead of blaming the runtime, and reports project-level validation blockers before focused syntax checks.
The report also names relevant Munin conventions/helpers (`CONTRIBUTING.md`, `HACKING.pod`, `Net::Server::Fork`, `Munin::Common::Timeout::do_with_timeout`, `Munin::Common::Logger`) and does not invent a user-visible failure beyond the collected perf/strace/proc evidence.perl likely remains stuck in a busy-poll loop. A diagnosis report and patch proposal were created locally.
## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.
## Patch Pass
You are working on a bounded fixer proposal.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Produce the smallest reasonable patch for the target repository, keep the change upstreamable, prefer the clearest control flow available, and do not keep avoidable `goto` when a simpler structure would read better. Before introducing new file, process, allocation, locking, networking, or platform APIs, inspect nearby code and project contribution docs for existing helpers or compatibility wrappers and use those local patterns unless you can explain why they do not fit. Validate from a reproducible workspace-root entrypoint before falling back to focused leaf commands; if a build or test cannot run, report the exact command, the exact blocker, and any narrower check you ran instead. During validation, also try one bounded independent reproduction of the collected failure signal when it is safe and cheap, such as a failing test, smoke command, perf/strace comparison, or before/after runtime check. Only use `reproduced` if that command or test actually reproduced the failure; otherwise keep `observed` and report the reproduction blocker. The final explanation must connect the observed issue evidence to the actual code change, not just paraphrase the diff. Write like a maintainer is going to read the patch mail cold: explain the bug in plain language, define subsystem-specific jargon the first time you need it, and make the causal story obvious. Explicitly classify evidence confidence as `reproduced`, `observed`, or `inferred`: `reproduced` means you reproduced the failure locally; `observed` means Fixer has direct crash/log/trace evidence but you did not independently reproduce it; `inferred` means the source patch is not pull-request-ready, so do not leave a source diff unless you first gather stronger observed/reproduced evidence; otherwise return a no-patch diagnosis/report. For any source-changing `observed` patch, say explicitly in `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. Security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior need reproduced evidence plus explicit security-impact analysis before leaving a source diff; otherwise return a no-patch diagnosis/report for human review. If you introduce non-obvious state translation, index remapping, or backend split logic, add a short source comment that explains the invariant being preserved.
Start by explaining the likely root cause from the collected perf, strace, and /proc evidence. If you cannot land a safe patch, leave a diagnosis that is strong enough for an upstream bug report.
Interpreter process expectation: when the hot process is Python, Perl, shell, Node, Ruby, PHP, Lua, or another interpreter, inspect both the runtime and the script/application entrypoint from `details.interpreter_process`. Prefer the script or application package when evidence points there; do not patch the interpreter runtime merely because the hot binary is `python`, `perl`, `bash`, or similar. Runtime fixes are welcome only after checking the entrypoint and explaining why the runtime mishandles the workload or why running bad code faster/safer is itself the right upstream fix.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Keep the change narrowly scoped and summarize validation clearly.
In every authoring pass, your final response must start with `Subject: <single-line git commit subject>` and then include these markdown sections exactly:
## Commit Message
A short upstream-friendly explanation of what changed and why. Write it in plain language that a maintainer can follow without local complaint context. If you use subsystem jargon, define it immediately.
## Evidence Confidence
Exactly one word: `reproduced`, `observed`, or `inferred`. Use `reproduced` only when you reproduced the failure locally with a command or test, and include that command/test in `## Validation`. Use `observed` when Fixer has direct crash/log/trace evidence but you did not independently reproduce it. If `## Git Add Paths` lists source files for an `observed` patch, `## Issue Connection` must explicitly say the failure was observed by Fixer and not independently reproduced. Security-sensitive source changes touching authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior require reproduced evidence and explicit security-impact analysis; otherwise list `None` under `## Git Add Paths` and write a no-patch diagnosis/report. Use `inferred` for profiler/strace/indirect evidence; inferred responses may be no-patch diagnoses or reports, but inferred source patches are not pull-request-ready until stronger evidence is gathered.
## Issue Connection
Write this as maintainer-facing patch mail, not as local Fixer notes. Cover four things explicitly in readable sentences: the user-visible symptom or the exact collected signal, the code-level cause or the cautious inference from evidence, the specific change you made, and the expected effect. Do not invent a reproducer, command line, crash, or user-visible failure that is not present in the evidence bundle. If the evidence is direct-but-not-reproduced, say it was observed by Fixer and not independently reproduced. If the evidence is indirect and you did not gather stronger evidence, do not leave a source diff; write a no-patch diagnosis/report instead. Include an explicit effect sentence such as `The expected effect is ...`, `This should reduce ...`, or `This prevents ...` for source patches. If the logic is non-obvious in code, mention that you added a short explanatory comment.
## Git Add Paths
List the repo-relative paths that belong in the final patch, one per line. Use `None` only when you intentionally made no source changes. Include intentionally new files, and do not list generated build artifacts.
## Validation
List the checks you ran, or say clearly that you could not run them. Include the independent reproduction command/test and result when `## Evidence Confidence` is `reproduced`; if reproduction was attempted but blocked, name the exact blocker and keep confidence at `observed` or `inferred`.
Before editing, read the plan at `./plan-output.txt` and follow it unless the code proves part of it wrong. If you change course, say so explicitly in the final write-up instead of silently drifting from the plan.
## Review Pass 1
You are reviewing a freshly generated fixer patch.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Review the first patch pass. The original pre-edit snapshot is available at `./source` for diffing.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout. The latest author response is at `./patch-output.txt`. Inspect the current code and changed paths like a strict code reviewer. Focus on correctness, regressions, maintainability, awkward control flow such as avoidable `goto`, missing validation, weak or non-gittable commit message text, and explanations that fail to connect the observed issue evidence to the code change. Also review the maintainer experience: the patch mail should be easy to accept upstream, the user-visible bug should be explained in plain language, subsystem-specific jargon should be defined when first used, and any non-obvious state translation or index remapping in code should have a short explanatory comment. Reject patches that omit `## Evidence Confidence`, use anything other than `reproduced`, `observed`, or `inferred`, or sound more certain than that evidence level allows. Reject patches that claim `reproduced` unless `## Validation` names the concrete reproduction command or test and its result. Reject source patches in security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior unless the author reproduced the behavior and explicitly analyzed the security impact of the change; observed-only evidence should become a diagnosis/report, not a PR-ready source diff. Reject patches that invent a reproducer, command line, crash, or user-visible failure not present in the evidence bundle; indirect profiler or strace evidence may justify a cautious mitigation, but the author must say it is indirect instead of presenting it as a confirmed upstream bug. Reject patches that introduce generic libc/std APIs when nearby code or project docs provide a local compat/helper API for the same job, unless the author explicitly justifies the exception. Reject validation that only reports a leaf object/syntax build when a project-level configure/build/test entrypoint exists and was not attempted; if a full build cannot run, the author must show the exact failed command and blocker.
Do not apply code changes in this pass.
Return a short markdown review report. The first non-empty line must be exactly one of:
RESULT: ok
RESULT: fix-needed
If you choose `RESULT: fix-needed`, add a `## Findings` section with concrete, actionable items.## Plan Pass
## Problem
Fixer observed `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` in a poll-family syscall loop, but the retained strace shows `pselect6` blocking for about 1.8-2.0 seconds per call and the sampled process state was `S (sleeping)` with only `0.9%` CPU. That does not establish a Munin busy loop or a Perl runtime bug.
## Evidence Confidence
observed
## Proposed Subject
No source patch yet: diagnose the current evidence as insufficient for an upstream Munin fix, and require a bounded reproduction tying excessive wakeups to `munin-node` application logic before editing.
## Patch Plan
1. Treat `/usr/sbin/munin-node` as the primary investigation target, not Perl, per the interpreter evidence.
2. Do not patch from the current bundle alone: the only concrete syscall evidence shows blocking `pselect6`, not a tight zero-timeout loop.
3. If extra evidence is collected before editing, target `script/munin-node` and `lib/Munin/Node/Server.pm` first, especially the `Net::Server::Fork` request loop and `process_request`.
4. Follow local conventions from `CONTRIBUTING.md` and `HACKING.pod`: taint-mode Perl, `use strict`, `use warnings`, English variable names where practical, one statement per line, and file-local style.
5. Prefer existing helpers if a real fix becomes justified: `Munin::Common::Timeout::do_with_timeout` for bounded operations, `Munin::Common::Logger` for diagnostics, `Munin::Node::OS` for child/plugin execution, and Net::Server hook methods for server-loop behavior.
6. Avoid awkward control flow such as avoidable `goto`; any change should be a small bounded guard, timeout normalization, or logging improvement with a direct test.
7. No prior Fixer patch was present in the workspace to improve or replace.
## Risks
A speculative source patch could alter daemon accept-loop behavior, TLS/session handling, or plugin timeout semantics without proof that Munin is misbehaving. This area includes connection admission and timeout behavior, so changing throttling/timing without a reproducer would be risky.
## Validation
Project-level validation attempted from the workspace root:
`make` failed because `Module::Build.pm` is missing at `Build.PL line 80`.
`make check` failed because there is no `check` target.
Focused checks attempted:
`perl -T -Ilib -c script/munin-node` passed, but it used installed generated `Munin::Common::Defaults.pm` from `/usr/share/perl5`, because the source checkout only has `Defaults.pm.PL`.
A bounded startup probe with `timeout 5 perl -Ilib -wT script/munin-node --foreground --config <abs t/config/munin-node.conf> ...` exited `1` without reproducing the reported poll-loop signal.
Before any source patch, collect one independent reproduction such as:
`strace -ttT -f -e trace=pselect6,select,poll,ppoll,epoll_wait,nanosleep,clock_nanosleep -p <munin-node-pid>`
and confirm repeated near-zero-duration wakeups plus meaningful CPU usage.
## Patch Pass
Subject: Diagnose munin-node poll evidence without source changes
## Commit Message
No source change is proposed. The collected evidence points to `munin-node` sleeping in a timed `select`/`pselect6` wait, not to a confirmed tight userspace poll loop. The likely root cause of the finding is that the profiler sampled the Perl `munin-node` process while it was idle in the kernel poll path; the `/proc` state was sleeping, CPU was only `0.9%`, and strace showed waits lasting about two seconds.
## Evidence Confidence
inferred
## Issue Connection
Fixer collected perf, strace, and `/proc` evidence for `/usr/bin/perl -wT /usr/sbin/munin-node --foreground`. The exact signal was repeated `pselect6` frames under Perl, but the retained strace lines show blocking calls with `1.815530` and `2.002044` second durations, while `/proc` reported `State: S (sleeping)` and low CPU.
I inspected the script entrypoint, `script/munin-node`, before considering the Perl runtime. The relevant server code is `lib/Munin/Node/Server.pm`, which delegates the daemon loop to `Net::Server::Fork` and uses Munin’s existing helpers such as `Munin::Common::Timeout::do_with_timeout`, `Munin::Common::Logger`, and `Munin::Node::OS` for timeout handling, logging, and child execution. I did not find a narrow code-level defect that explains a tight loop.
No source change was made. This follows the saved plan in `plan-output.txt`: without stronger evidence of repeated near-zero-duration wakeups or meaningful CPU consumption, a timing/throttling patch would be speculative and not upstream-ready. The expected effect is no runtime change; this report should instead steer upstream review toward collecting a Perl-level stack or an attach-time strace that proves a real busy wakeup before changing daemon timing behavior.
## Git Add Paths
None
## Validation
`make` from the workspace root failed before tests could run:
`Can't locate Module/Build.pm in @INC ... at Build.PL line 80`, followed by `make: *** [Makefile:149: Build] Error 2`.
`make check` from the workspace root failed because the target does not exist:
`make: *** No rule to make target 'check'. Stop.`
Focused check:
`perl -T -Ilib -c script/munin-node` passed with `script/munin-node syntax OK`.
Caveat for the focused check: the checkout has `lib/Munin/Common/Defaults.pm.PL`, not the generated `Defaults.pm`; `perl -Ilib -MMunin::Common::Defaults -e ...` resolved `/usr/share/perl5/Munin/Common/Defaults.pm`.
Independent reproduction attempt:
`strace -ttT -f -e trace=pselect6,select,poll,ppoll,epoll_wait,nanosleep,clock_nanosleep timeout 5 perl -Ilib -wT script/munin-node ...` was blocked by sandbox ptrace restrictions: `PTRACE_TRACEME: Operation not permitted` and `ptrace(PTRACE_SEIZE, 4): Operation not permitted`.
Non-strace smoke attempt:
`timeout 5 perl -Ilib -wT script/munin-node --foreground --config <workspace>/t/config/munin-node.conf ...` exited `1` and did not reproduce the collected poll-loop signal.
## Review Pass 1
RESULT: ok
No blocking findings. The generated pass leaves no source diff, correctly reports `## Evidence Confidence` as `inferred`, lists `None` under `## Git Add Paths`, and does not present the profiler/strace evidence as a reproduced Munin bug.
Validation reporting is acceptable: it attempted `make`, reported the missing `Module::Build.pm` blocker, attempted `make check`, reported the missing target, and included focused syntax plus bounded reproduction attempts with their blockers/results.perl likely remains stuck in a busy-poll loop. A diagnosis report and patch proposal were created locally.
## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.
## Patch Pass
You are working on a bounded fixer proposal.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Produce the smallest reasonable patch for the target repository, keep the change upstreamable, prefer the clearest control flow available, and do not keep avoidable `goto` when a simpler structure would read better. Before introducing new file, process, allocation, locking, networking, or platform APIs, inspect nearby code and project contribution docs for existing helpers or compatibility wrappers and use those local patterns unless you can explain why they do not fit. Validate from a reproducible workspace-root entrypoint before falling back to focused leaf commands; if a build or test cannot run, report the exact command, the exact blocker, and any narrower check you ran instead. During validation, also try one bounded independent reproduction of the collected failure signal when it is safe and cheap, such as a failing test, smoke command, perf/strace comparison, or before/after runtime check. Only use `reproduced` if that command or test actually reproduced the failure; otherwise keep `observed` and report the reproduction blocker. The final explanation must connect the observed issue evidence to the actual code change, not just paraphrase the diff. Write like a maintainer is going to read the patch mail cold: explain the bug in plain language, define subsystem-specific jargon the first time you need it, and make the causal story obvious. Explicitly classify evidence confidence as `reproduced`, `observed`, or `inferred`: `reproduced` means you reproduced the failure locally; `observed` means Fixer has direct crash/log/trace evidence but you did not independently reproduce it; `inferred` means the source patch is not pull-request-ready, so do not leave a source diff unless you first gather stronger observed/reproduced evidence; otherwise return a no-patch diagnosis/report. For any source-changing `observed` patch, say explicitly in `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. Security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior need reproduced evidence plus explicit security-impact analysis before leaving a source diff; otherwise return a no-patch diagnosis/report for human review. If you introduce non-obvious state translation, index remapping, or backend split logic, add a short source comment that explains the invariant being preserved.
Start by explaining the likely root cause from the collected perf, strace, and /proc evidence. If you cannot land a safe patch, leave a diagnosis that is strong enough for an upstream bug report.
Interpreter process expectation: when the hot process is Python, Perl, shell, Node, Ruby, PHP, Lua, or another interpreter, inspect both the runtime and the script/application entrypoint from `details.interpreter_process`. Prefer the script or application package when evidence points there; do not patch the interpreter runtime merely because the hot binary is `python`, `perl`, `bash`, or similar. Runtime fixes are welcome only after checking the entrypoint and explaining why the runtime mishandles the workload or why running bad code faster/safer is itself the right upstream fix.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Keep the change narrowly scoped and summarize validation clearly.
In every authoring pass, your final response must start with `Subject: <single-line git commit subject>` and then include these markdown sections exactly:
## Commit Message
A short upstream-friendly explanation of what changed and why. Write it in plain language that a maintainer can follow without local complaint context. If you use subsystem jargon, define it immediately.
## Evidence Confidence
Exactly one word: `reproduced`, `observed`, or `inferred`. Use `reproduced` only when you reproduced the failure locally with a command or test, and include that command/test in `## Validation`. Use `observed` when Fixer has direct crash/log/trace evidence but you did not independently reproduce it. If `## Git Add Paths` lists source files for an `observed` patch, `## Issue Connection` must explicitly say the failure was observed by Fixer and not independently reproduced. Security-sensitive source changes touching authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior require reproduced evidence and explicit security-impact analysis; otherwise list `None` under `## Git Add Paths` and write a no-patch diagnosis/report. Use `inferred` for profiler/strace/indirect evidence; inferred responses may be no-patch diagnoses or reports, but inferred source patches are not pull-request-ready until stronger evidence is gathered.
## Issue Connection
Write this as maintainer-facing patch mail, not as local Fixer notes. Cover four things explicitly in readable sentences: the user-visible symptom or the exact collected signal, the code-level cause or the cautious inference from evidence, the specific change you made, and the expected effect. Do not invent a reproducer, command line, crash, or user-visible failure that is not present in the evidence bundle. If the evidence is direct-but-not-reproduced, say it was observed by Fixer and not independently reproduced. If the evidence is indirect and you did not gather stronger evidence, do not leave a source diff; write a no-patch diagnosis/report instead. Include an explicit effect sentence such as `The expected effect is ...`, `This should reduce ...`, or `This prevents ...` for source patches. If the logic is non-obvious in code, mention that you added a short explanatory comment.
## Git Add Paths
List the repo-relative paths that belong in the final patch, one per line. Use `None` only when you intentionally made no source changes. Include intentionally new files, and do not list generated build artifacts.
## Validation
List the checks you ran, or say clearly that you could not run them. Include the independent reproduction command/test and result when `## Evidence Confidence` is `reproduced`; if reproduction was attempted but blocked, name the exact blocker and keep confidence at `observed` or `inferred`.
Before editing, read the plan at `./plan-output.txt` and follow it unless the code proves part of it wrong. If you change course, say so explicitly in the final write-up instead of silently drifting from the plan.
## Review Pass 1
You are reviewing a freshly generated fixer patch.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Review the first patch pass. The original pre-edit snapshot is available at `./source` for diffing.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout. The latest author response is at `./patch-output.txt`. Inspect the current code and changed paths like a strict code reviewer. Focus on correctness, regressions, maintainability, awkward control flow such as avoidable `goto`, missing validation, weak or non-gittable commit message text, and explanations that fail to connect the observed issue evidence to the code change. Also review the maintainer experience: the patch mail should be easy to accept upstream, the user-visible bug should be explained in plain language, subsystem-specific jargon should be defined when first used, and any non-obvious state translation or index remapping in code should have a short explanatory comment. Reject patches that omit `## Evidence Confidence`, use anything other than `reproduced`, `observed`, or `inferred`, or sound more certain than that evidence level allows. Reject patches that claim `reproduced` unless `## Validation` names the concrete reproduction command or test and its result. Reject source patches in security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior unless the author reproduced the behavior and explicitly analyzed the security impact of the change; observed-only evidence should become a diagnosis/report, not a PR-ready source diff. Reject patches that invent a reproducer, command line, crash, or user-visible failure not present in the evidence bundle; indirect profiler or strace evidence may justify a cautious mitigation, but the author must say it is indirect instead of presenting it as a confirmed upstream bug. Reject patches that introduce generic libc/std APIs when nearby code or project docs provide a local compat/helper API for the same job, unless the author explicitly justifies the exception. Reject validation that only reports a leaf object/syntax build when a project-level configure/build/test entrypoint exists and was not attempted; if a full build cannot run, the author must show the exact failed command and blocker.
Do not apply code changes in this pass.
Return a short markdown review report. The first non-empty line must be exactly one of:
RESULT: ok
RESULT: fix-needed
If you choose `RESULT: fix-needed`, add a `## Findings` section with concrete, actionable items.## Plan Pass
## Problem
Fixer observed `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` in a poll-family syscall loop, but the retained strace shows `pselect6` blocking for about 1.8-2.0 seconds per call and the sampled process state was `S (sleeping)` with only `0.9%` CPU. That does not establish a Munin busy loop or a Perl runtime bug.
## Evidence Confidence
observed
## Proposed Subject
No source patch yet: diagnose the current evidence as insufficient for an upstream Munin fix, and require a bounded reproduction tying excessive wakeups to `munin-node` application logic before editing.
## Patch Plan
1. Treat `/usr/sbin/munin-node` as the primary investigation target, not Perl, per the interpreter evidence.
2. Do not patch from the current bundle alone: the only concrete syscall evidence shows blocking `pselect6`, not a tight zero-timeout loop.
3. If extra evidence is collected before editing, target `script/munin-node` and `lib/Munin/Node/Server.pm` first, especially the `Net::Server::Fork` request loop and `process_request`.
4. Follow local conventions from `CONTRIBUTING.md` and `HACKING.pod`: taint-mode Perl, `use strict`, `use warnings`, English variable names where practical, one statement per line, and file-local style.
5. Prefer existing helpers if a real fix becomes justified: `Munin::Common::Timeout::do_with_timeout` for bounded operations, `Munin::Common::Logger` for diagnostics, `Munin::Node::OS` for child/plugin execution, and Net::Server hook methods for server-loop behavior.
6. Avoid awkward control flow such as avoidable `goto`; any change should be a small bounded guard, timeout normalization, or logging improvement with a direct test.
7. No prior Fixer patch was present in the workspace to improve or replace.
## Risks
A speculative source patch could alter daemon accept-loop behavior, TLS/session handling, or plugin timeout semantics without proof that Munin is misbehaving. This area includes connection admission and timeout behavior, so changing throttling/timing without a reproducer would be risky.
## Validation
Project-level validation attempted from the workspace root:
`make` failed because `Module::Build.pm` is missing at `Build.PL line 80`.
`make check` failed because there is no `check` target.
Focused checks attempted:
`perl -T -Ilib -c script/munin-node` passed, but it used installed generated `Munin::Common::Defaults.pm` from `/usr/share/perl5`, because the source checkout only has `Defaults.pm.PL`.
A bounded startup probe with `timeout 5 perl -Ilib -wT script/munin-node --foreground --config <abs t/config/munin-node.conf> ...` exited `1` without reproducing the reported poll-loop signal.
Before any source patch, collect one independent reproduction such as:
`strace -ttT -f -e trace=pselect6,select,poll,ppoll,epoll_wait,nanosleep,clock_nanosleep -p <munin-node-pid>`
and confirm repeated near-zero-duration wakeups plus meaningful CPU usage.
## Patch Pass
Subject: Diagnose munin-node poll evidence without source changes
## Commit Message
No source change is proposed. The collected evidence points to `munin-node` sleeping in a timed `select`/`pselect6` wait, not to a confirmed tight userspace poll loop. The likely root cause of the finding is that the profiler sampled the Perl `munin-node` process while it was idle in the kernel poll path; the `/proc` state was sleeping, CPU was only `0.9%`, and strace showed waits lasting about two seconds.
## Evidence Confidence
inferred
## Issue Connection
Fixer collected perf, strace, and `/proc` evidence for `/usr/bin/perl -wT /usr/sbin/munin-node --foreground`. The exact signal was repeated `pselect6` frames under Perl, but the retained strace lines show blocking calls with `1.815530` and `2.002044` second durations, while `/proc` reported `State: S (sleeping)` and low CPU.
I inspected the script entrypoint, `script/munin-node`, before considering the Perl runtime. The relevant server code is `lib/Munin/Node/Server.pm`, which delegates the daemon loop to `Net::Server::Fork` and uses Munin’s existing helpers such as `Munin::Common::Timeout::do_with_timeout`, `Munin::Common::Logger`, and `Munin::Node::OS` for timeout handling, logging, and child execution. I did not find a narrow code-level defect that explains a tight loop.
No source change was made. This follows the saved plan in `plan-output.txt`: without stronger evidence of repeated near-zero-duration wakeups or meaningful CPU consumption, a timing/throttling patch would be speculative and not upstream-ready. The expected effect is no runtime change; this report should instead steer upstream review toward collecting a Perl-level stack or an attach-time strace that proves a real busy wakeup before changing daemon timing behavior.
## Git Add Paths
None
## Validation
`make` from the workspace root failed before tests could run:
`Can't locate Module/Build.pm in @INC ... at Build.PL line 80`, followed by `make: *** [Makefile:149: Build] Error 2`.
`make check` from the workspace root failed because the target does not exist:
`make: *** No rule to make target 'check'. Stop.`
Focused check:
`perl -T -Ilib -c script/munin-node` passed with `script/munin-node syntax OK`.
Caveat for the focused check: the checkout has `lib/Munin/Common/Defaults.pm.PL`, not the generated `Defaults.pm`; `perl -Ilib -MMunin::Common::Defaults -e ...` resolved `/usr/share/perl5/Munin/Common/Defaults.pm`.
Independent reproduction attempt:
`strace -ttT -f -e trace=pselect6,select,poll,ppoll,epoll_wait,nanosleep,clock_nanosleep timeout 5 perl -Ilib -wT script/munin-node ...` was blocked by sandbox ptrace restrictions: `PTRACE_TRACEME: Operation not permitted` and `ptrace(PTRACE_SEIZE, 4): Operation not permitted`.
Non-strace smoke attempt:
`timeout 5 perl -Ilib -wT script/munin-node --foreground --config <workspace>/t/config/munin-node.conf ...` exited `1` and did not reproduce the collected poll-loop signal.
## Review Pass 1
RESULT: ok
No blocking findings. The generated pass leaves no source diff, correctly reports `## Evidence Confidence` as `inferred`, lists `None` under `## Git Add Paths`, and does not present the profiler/strace evidence as a reproduced Munin bug.
Validation reporting is acceptable: it attempted `make`, reported the missing `Module::Build.pm` blocker, attempted `make check`, reported the missing target, and included focused syntax plus bounded reproduction attempts with their blockers/results.perl likely remains stuck in a busy-poll loop. A diagnosis report and patch proposal were created locally.
## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.
## Patch Pass
You are working on a bounded fixer proposal.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Produce the smallest reasonable patch for the target repository, keep the change upstreamable, prefer the clearest control flow available, and do not keep avoidable `goto` when a simpler structure would read better. Before introducing new file, process, allocation, locking, networking, or platform APIs, inspect nearby code and project contribution docs for existing helpers or compatibility wrappers and use those local patterns unless you can explain why they do not fit. Validate from a reproducible workspace-root entrypoint before falling back to focused leaf commands; if a build or test cannot run, report the exact command, the exact blocker, and any narrower check you ran instead. During validation, also try one bounded independent reproduction of the collected failure signal when it is safe and cheap, such as a failing test, smoke command, perf/strace comparison, or before/after runtime check. Only use `reproduced` if that command or test actually reproduced the failure; otherwise keep `observed` and report the reproduction blocker. The final explanation must connect the observed issue evidence to the actual code change, not just paraphrase the diff. Write like a maintainer is going to read the patch mail cold: explain the bug in plain language, define subsystem-specific jargon the first time you need it, and make the causal story obvious. Explicitly classify evidence confidence as `reproduced`, `observed`, or `inferred`: `reproduced` means you reproduced the failure locally; `observed` means Fixer has direct crash/log/trace evidence but you did not independently reproduce it; `inferred` means the source patch is not pull-request-ready, so do not leave a source diff unless you first gather stronger observed/reproduced evidence; otherwise return a no-patch diagnosis/report. For any source-changing `observed` patch, say explicitly in `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. Security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior need reproduced evidence plus explicit security-impact analysis before leaving a source diff; otherwise return a no-patch diagnosis/report for human review. If you introduce non-obvious state translation, index remapping, or backend split logic, add a short source comment that explains the invariant being preserved.
Start by explaining the likely root cause from the collected perf, strace, and /proc evidence. If you cannot land a safe patch, leave a diagnosis that is strong enough for an upstream bug report.
Interpreter process expectation: when the hot process is Python, Perl, shell, Node, Ruby, PHP, Lua, or another interpreter, inspect both the runtime and the script/application entrypoint from `details.interpreter_process`. Prefer the script or application package when evidence points there; do not patch the interpreter runtime merely because the hot binary is `python`, `perl`, `bash`, or similar. Runtime fixes are welcome only after checking the entrypoint and explaining why the runtime mishandles the workload or why running bad code faster/safer is itself the right upstream fix.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Keep the change narrowly scoped and summarize validation clearly.
In every authoring pass, your final response must start with `Subject: <single-line git commit subject>` and then include these markdown sections exactly:
## Commit Message
A short upstream-friendly explanation of what changed and why. Write it in plain language that a maintainer can follow without local complaint context. If you use subsystem jargon, define it immediately.
## Evidence Confidence
Exactly one word: `reproduced`, `observed`, or `inferred`. Use `reproduced` only when you reproduced the failure locally with a command or test, and include that command/test in `## Validation`. Use `observed` when Fixer has direct crash/log/trace evidence but you did not independently reproduce it. If `## Git Add Paths` lists source files for an `observed` patch, `## Issue Connection` must explicitly say the failure was observed by Fixer and not independently reproduced. Security-sensitive source changes touching authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior require reproduced evidence and explicit security-impact analysis; otherwise list `None` under `## Git Add Paths` and write a no-patch diagnosis/report. Use `inferred` for profiler/strace/indirect evidence; inferred responses may be no-patch diagnoses or reports, but inferred source patches are not pull-request-ready until stronger evidence is gathered.
## Issue Connection
Write this as maintainer-facing patch mail, not as local Fixer notes. Cover four things explicitly in readable sentences: the user-visible symptom or the exact collected signal, the code-level cause or the cautious inference from evidence, the specific change you made, and the expected effect. Do not invent a reproducer, command line, crash, or user-visible failure that is not present in the evidence bundle. If the evidence is direct-but-not-reproduced, say it was observed by Fixer and not independently reproduced. If the evidence is indirect and you did not gather stronger evidence, do not leave a source diff; write a no-patch diagnosis/report instead. Include an explicit effect sentence such as `The expected effect is ...`, `This should reduce ...`, or `This prevents ...` for source patches. If the logic is non-obvious in code, mention that you added a short explanatory comment.
## Git Add Paths
List the repo-relative paths that belong in the final patch, one per line. Use `None` only when you intentionally made no source changes. Include intentionally new files, and do not list generated build artifacts.
## Validation
List the checks you ran, or say clearly that you could not run them. Include the independent reproduction command/test and result when `## Evidence Confidence` is `reproduced`; if reproduction was attempted but blocked, name the exact blocker and keep confidence at `observed` or `inferred`.
Before editing, read the plan at `./plan-output.txt` and follow it unless the code proves part of it wrong. If you change course, say so explicitly in the final write-up instead of silently drifting from the plan.
## Review Pass 1
You are reviewing a freshly generated fixer patch.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Review the first patch pass. The original pre-edit snapshot is available at `./source` for diffing.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout. The latest author response is at `./patch-output.txt`. Inspect the current code and changed paths like a strict code reviewer. Focus on correctness, regressions, maintainability, awkward control flow such as avoidable `goto`, missing validation, weak or non-gittable commit message text, and explanations that fail to connect the observed issue evidence to the code change. Also review the maintainer experience: the patch mail should be easy to accept upstream, the user-visible bug should be explained in plain language, subsystem-specific jargon should be defined when first used, and any non-obvious state translation or index remapping in code should have a short explanatory comment. Reject patches that omit `## Evidence Confidence`, use anything other than `reproduced`, `observed`, or `inferred`, or sound more certain than that evidence level allows. Reject patches that claim `reproduced` unless `## Validation` names the concrete reproduction command or test and its result. Reject source patches in security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior unless the author reproduced the behavior and explicitly analyzed the security impact of the change; observed-only evidence should become a diagnosis/report, not a PR-ready source diff. Reject patches that invent a reproducer, command line, crash, or user-visible failure not present in the evidence bundle; indirect profiler or strace evidence may justify a cautious mitigation, but the author must say it is indirect instead of presenting it as a confirmed upstream bug. Reject patches that introduce generic libc/std APIs when nearby code or project docs provide a local compat/helper API for the same job, unless the author explicitly justifies the exception. Reject validation that only reports a leaf object/syntax build when a project-level configure/build/test entrypoint exists and was not attempted; if a full build cannot run, the author must show the exact failed command and blocker.
Do not apply code changes in this pass.
Return a short markdown review report. The first non-empty line must be exactly one of:
RESULT: ok
RESULT: fix-needed
If you choose `RESULT: fix-needed`, add a `## Findings` section with concrete, actionable items.## Plan Pass
## Problem
Fixer observed `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` in repeated `pselect6`, but the retained evidence does not prove a munin application-level tight loop. The strace sample shows `pselect6` calls sleeping for about 1.8-2.0 seconds, `/proc` reports `State: S (sleeping)`, and CPU was only 0.9%. Local inspection shows `munin-node` uses `Munin::Node::Server`, a `Net::Server::Fork` subclass; `Net::Server::Fork->accept` intentionally waits with `can_read(2)` in its signal-aware accept loop.
## Evidence Confidence
observed
## Proposed Subject
No patch: diagnose munin-node pselect wakeups as Net::Server idle loop pending stronger evidence
## Patch Plan
Do not edit source in this pass. Treat the current bundle as an observed trace/report diagnosis, not a pull-request-ready bug fix.
If later evidence shows actual CPU burn or immediate-return polling, inspect `lib/Munin/Node/Server.pm` first, then `Munin::Common::Timeout::do_with_timeout`, `_net_read`, TLS reads, and plugin child handling in `Munin::Node::OS`. Follow `CONTRIBUTING.md` and `HACKING.pod`: taint mode, `use strict`, `use warnings`, existing indentation style, `English qw(-no_match_vars)`, and existing logging via `Munin::Common::Logger`. No relevant file IO/process wrapper is needed for the no-patch diagnosis; relevant local helpers found are `Munin::Common::Timeout::do_with_timeout`, `Munin::Common::Logger`, and `Munin::Node::OS->run_as_child`.
No prior Fixer source patch appears present: git history only shows `Fixer baseline`, and the worktree is clean.
## Risks
A source change based only on this bundle would likely tune normal `Net::Server::Fork` accept-loop behavior rather than fix a confirmed munin bug. Changing the accept timeout would touch timing/throttling behavior and could affect signal responsiveness, reload behavior, and connection latency without reproduced evidence of a problem.
## Validation
Before any future source patch, try project-level validation from the workspace root: `make`, then `make test` because this Makefile does not define `make check`.
For a bounded independent reproduction attempt, run `munin-node` from the built tree under `strace -ttT -f -e trace=pselect6,select,poll,ppoll,nanosleep` with a minimal temporary config and foreground mode, then confirm whether `pselect6` blocks for about two seconds with low CPU or returns immediately in a tight loop. Do not claim `reproduced` unless that command actually shows the problematic busy loop.
## Patch Pass
Subject: No patch: diagnose munin-node idle poll evidence
## Commit Message
No source change was made. The collected trace points at `munin-node` idling in the `Net::Server::Fork` accept loop, not at a confirmed munin busy loop. The plan said to stop with a diagnosis unless stronger evidence appeared; I followed that plan.
## Evidence Confidence
observed
## Issue Connection
Fixer observed `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` with repeated `pselect6` frames and classified it as a likely busy poll loop. The retained strace lines show timed waits of about 1.8 to 2.0 seconds, `/proc` reports `State: S (sleeping)`, and the sampled CPU was only 0.9%, so the evidence does not show an immediate-return poll loop.
The likely code-level cause of the collected signal is normal idle waiting in `Net::Server::Fork`: `Munin::Node::Server` subclasses `Net::Server::Fork`, and that module’s `accept` method calls `can_read(2)`. That matches the two-second `pselect6` timeouts in the evidence. I inspected the script entrypoint and munin node server code first, rather than treating Perl itself as the target runtime bug.
I made no source change because changing this would touch accept-loop timing behavior without reproduced evidence of excessive CPU or a munin-level tight loop. The expected effect is to avoid landing a speculative timing patch and leave an upstream-ready diagnosis for gathering stronger evidence first. Relevant local conventions/helpers found: `CONTRIBUTING.md`, `HACKING.pod`, `Munin::Common::Timeout::do_with_timeout`, `Munin::Common::Logger`, and `Munin::Node::OS->run_as_child`. No prior Fixer patch was present to replace; the worktree stayed clean.
## Git Add Paths
None
## Validation
`make` from the workspace root failed before building munin code because `Module::Build` is missing:
`Can't locate Module/Build.pm in @INC ... at Build.PL line 80.`
`make check` is not available:
`make: *** No rule to make target 'check'. Stop.`
Focused checks:
`perl -T -Ilib -c script/munin-node` passed.
`perl -Ilib -c lib/Munin/Node/Server.pm` passed.
`perl -Ilib -c lib/Munin/Common/Timeout.pm` passed.
`perl -Ilib -c lib/Munin/Node/OS.pm` passed, with existing subroutine redefinition warnings.
Independent reproduction attempts were blocked, so I did not claim `reproduced`. `strace -ttT -f ...` failed with ptrace denied: `Operation not permitted`. A foreground `munin-node` smoke run with an empty temporary config failed because the sandbox disallowed binding a TCP listener: `Cannot bind and listen to TCP port 0 on * [Operation not permitted]`.
## Review Pass 1
RESULT: ok
No source patch is present in the workspace, and the author’s no-patch diagnosis is consistent with the evidence. The report does not overclaim reproduction, keeps `## Evidence Confidence` to an allowed value, and explains why the observed two-second `pselect6` waits are not enough to justify changing munin’s timing behavior.
Validation is acceptable for a no-patch report: `make` was attempted and failed on missing `Module::Build`, `make check` was attempted and found unavailable, and focused syntax checks plus blocked reproduction attempts were reported with concrete blockers.perl likely remains stuck in a busy-poll loop. A diagnosis report and patch proposal were created locally.
## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.
## Patch Pass
You are working on a bounded fixer proposal.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Produce the smallest reasonable patch for the target repository, keep the change upstreamable, prefer the clearest control flow available, and do not keep avoidable `goto` when a simpler structure would read better. Before introducing new file, process, allocation, locking, networking, or platform APIs, inspect nearby code and project contribution docs for existing helpers or compatibility wrappers and use those local patterns unless you can explain why they do not fit. Validate from a reproducible workspace-root entrypoint before falling back to focused leaf commands; if a build or test cannot run, report the exact command, the exact blocker, and any narrower check you ran instead. During validation, also try one bounded independent reproduction of the collected failure signal when it is safe and cheap, such as a failing test, smoke command, perf/strace comparison, or before/after runtime check. Only use `reproduced` if that command or test actually reproduced the failure; otherwise keep `observed` and report the reproduction blocker. The final explanation must connect the observed issue evidence to the actual code change, not just paraphrase the diff. Write like a maintainer is going to read the patch mail cold: explain the bug in plain language, define subsystem-specific jargon the first time you need it, and make the causal story obvious. Explicitly classify evidence confidence as `reproduced`, `observed`, or `inferred`: `reproduced` means you reproduced the failure locally; `observed` means Fixer has direct crash/log/trace evidence but you did not independently reproduce it; `inferred` means the source patch is not pull-request-ready, so do not leave a source diff unless you first gather stronger observed/reproduced evidence; otherwise return a no-patch diagnosis/report. For any source-changing `observed` patch, say explicitly in `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. Security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior need reproduced evidence plus explicit security-impact analysis before leaving a source diff; otherwise return a no-patch diagnosis/report for human review. If you introduce non-obvious state translation, index remapping, or backend split logic, add a short source comment that explains the invariant being preserved.
Start by explaining the likely root cause from the collected perf, strace, and /proc evidence. If you cannot land a safe patch, leave a diagnosis that is strong enough for an upstream bug report.
Interpreter process expectation: when the hot process is Python, Perl, shell, Node, Ruby, PHP, Lua, or another interpreter, inspect both the runtime and the script/application entrypoint from `details.interpreter_process`. Prefer the script or application package when evidence points there; do not patch the interpreter runtime merely because the hot binary is `python`, `perl`, `bash`, or similar. Runtime fixes are welcome only after checking the entrypoint and explaining why the runtime mishandles the workload or why running bad code faster/safer is itself the right upstream fix.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Keep the change narrowly scoped and summarize validation clearly.
In every authoring pass, your final response must start with `Subject: <single-line git commit subject>` and then include these markdown sections exactly:
## Commit Message
A short upstream-friendly explanation of what changed and why. Write it in plain language that a maintainer can follow without local complaint context. If you use subsystem jargon, define it immediately.
## Evidence Confidence
Exactly one word: `reproduced`, `observed`, or `inferred`. Use `reproduced` only when you reproduced the failure locally with a command or test, and include that command/test in `## Validation`. Use `observed` when Fixer has direct crash/log/trace evidence but you did not independently reproduce it. If `## Git Add Paths` lists source files for an `observed` patch, `## Issue Connection` must explicitly say the failure was observed by Fixer and not independently reproduced. Security-sensitive source changes touching authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior require reproduced evidence and explicit security-impact analysis; otherwise list `None` under `## Git Add Paths` and write a no-patch diagnosis/report. Use `inferred` for profiler/strace/indirect evidence; inferred responses may be no-patch diagnoses or reports, but inferred source patches are not pull-request-ready until stronger evidence is gathered.
## Issue Connection
Write this as maintainer-facing patch mail, not as local Fixer notes. Cover four things explicitly in readable sentences: the user-visible symptom or the exact collected signal, the code-level cause or the cautious inference from evidence, the specific change you made, and the expected effect. Do not invent a reproducer, command line, crash, or user-visible failure that is not present in the evidence bundle. If the evidence is direct-but-not-reproduced, say it was observed by Fixer and not independently reproduced. If the evidence is indirect and you did not gather stronger evidence, do not leave a source diff; write a no-patch diagnosis/report instead. Include an explicit effect sentence such as `The expected effect is ...`, `This should reduce ...`, or `This prevents ...` for source patches. If the logic is non-obvious in code, mention that you added a short explanatory comment.
## Git Add Paths
List the repo-relative paths that belong in the final patch, one per line. Use `None` only when you intentionally made no source changes. Include intentionally new files, and do not list generated build artifacts.
## Validation
List the checks you ran, or say clearly that you could not run them. Include the independent reproduction command/test and result when `## Evidence Confidence` is `reproduced`; if reproduction was attempted but blocked, name the exact blocker and keep confidence at `observed` or `inferred`.
Before editing, read the plan at `./plan-output.txt` and follow it unless the code proves part of it wrong. If you change course, say so explicitly in the final write-up instead of silently drifting from the plan.
## Review Pass 1
You are reviewing a freshly generated fixer patch.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Review the first patch pass. The original pre-edit snapshot is available at `./source` for diffing.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout. The latest author response is at `./patch-output.txt`. Inspect the current code and changed paths like a strict code reviewer. Focus on correctness, regressions, maintainability, awkward control flow such as avoidable `goto`, missing validation, weak or non-gittable commit message text, and explanations that fail to connect the observed issue evidence to the code change. Also review the maintainer experience: the patch mail should be easy to accept upstream, the user-visible bug should be explained in plain language, subsystem-specific jargon should be defined when first used, and any non-obvious state translation or index remapping in code should have a short explanatory comment. Reject patches that omit `## Evidence Confidence`, use anything other than `reproduced`, `observed`, or `inferred`, or sound more certain than that evidence level allows. Reject patches that claim `reproduced` unless `## Validation` names the concrete reproduction command or test and its result. Reject source patches in security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior unless the author reproduced the behavior and explicitly analyzed the security impact of the change; observed-only evidence should become a diagnosis/report, not a PR-ready source diff. Reject patches that invent a reproducer, command line, crash, or user-visible failure not present in the evidence bundle; indirect profiler or strace evidence may justify a cautious mitigation, but the author must say it is indirect instead of presenting it as a confirmed upstream bug. Reject patches that introduce generic libc/std APIs when nearby code or project docs provide a local compat/helper API for the same job, unless the author explicitly justifies the exception. Reject validation that only reports a leaf object/syntax build when a project-level configure/build/test entrypoint exists and was not attempted; if a full build cannot run, the author must show the exact failed command and blocker.
Do not apply code changes in this pass.
Return a short markdown review report. The first non-empty line must be exactly one of:
RESULT: ok
RESULT: fix-needed
If you choose `RESULT: fix-needed`, add a `## Findings` section with concrete, actionable items.## Plan Pass
## Problem
Fixer observed `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` in repeated `pselect6`, but the retained evidence does not prove a munin application-level tight loop. The strace sample shows `pselect6` calls sleeping for about 1.8-2.0 seconds, `/proc` reports `State: S (sleeping)`, and CPU was only 0.9%. Local inspection shows `munin-node` uses `Munin::Node::Server`, a `Net::Server::Fork` subclass; `Net::Server::Fork->accept` intentionally waits with `can_read(2)` in its signal-aware accept loop.
## Evidence Confidence
observed
## Proposed Subject
No patch: diagnose munin-node pselect wakeups as Net::Server idle loop pending stronger evidence
## Patch Plan
Do not edit source in this pass. Treat the current bundle as an observed trace/report diagnosis, not a pull-request-ready bug fix.
If later evidence shows actual CPU burn or immediate-return polling, inspect `lib/Munin/Node/Server.pm` first, then `Munin::Common::Timeout::do_with_timeout`, `_net_read`, TLS reads, and plugin child handling in `Munin::Node::OS`. Follow `CONTRIBUTING.md` and `HACKING.pod`: taint mode, `use strict`, `use warnings`, existing indentation style, `English qw(-no_match_vars)`, and existing logging via `Munin::Common::Logger`. No relevant file IO/process wrapper is needed for the no-patch diagnosis; relevant local helpers found are `Munin::Common::Timeout::do_with_timeout`, `Munin::Common::Logger`, and `Munin::Node::OS->run_as_child`.
No prior Fixer source patch appears present: git history only shows `Fixer baseline`, and the worktree is clean.
## Risks
A source change based only on this bundle would likely tune normal `Net::Server::Fork` accept-loop behavior rather than fix a confirmed munin bug. Changing the accept timeout would touch timing/throttling behavior and could affect signal responsiveness, reload behavior, and connection latency without reproduced evidence of a problem.
## Validation
Before any future source patch, try project-level validation from the workspace root: `make`, then `make test` because this Makefile does not define `make check`.
For a bounded independent reproduction attempt, run `munin-node` from the built tree under `strace -ttT -f -e trace=pselect6,select,poll,ppoll,nanosleep` with a minimal temporary config and foreground mode, then confirm whether `pselect6` blocks for about two seconds with low CPU or returns immediately in a tight loop. Do not claim `reproduced` unless that command actually shows the problematic busy loop.
## Patch Pass
Subject: No patch: diagnose munin-node idle poll evidence
## Commit Message
No source change was made. The collected trace points at `munin-node` idling in the `Net::Server::Fork` accept loop, not at a confirmed munin busy loop. The plan said to stop with a diagnosis unless stronger evidence appeared; I followed that plan.
## Evidence Confidence
observed
## Issue Connection
Fixer observed `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` with repeated `pselect6` frames and classified it as a likely busy poll loop. The retained strace lines show timed waits of about 1.8 to 2.0 seconds, `/proc` reports `State: S (sleeping)`, and the sampled CPU was only 0.9%, so the evidence does not show an immediate-return poll loop.
The likely code-level cause of the collected signal is normal idle waiting in `Net::Server::Fork`: `Munin::Node::Server` subclasses `Net::Server::Fork`, and that module’s `accept` method calls `can_read(2)`. That matches the two-second `pselect6` timeouts in the evidence. I inspected the script entrypoint and munin node server code first, rather than treating Perl itself as the target runtime bug.
I made no source change because changing this would touch accept-loop timing behavior without reproduced evidence of excessive CPU or a munin-level tight loop. The expected effect is to avoid landing a speculative timing patch and leave an upstream-ready diagnosis for gathering stronger evidence first. Relevant local conventions/helpers found: `CONTRIBUTING.md`, `HACKING.pod`, `Munin::Common::Timeout::do_with_timeout`, `Munin::Common::Logger`, and `Munin::Node::OS->run_as_child`. No prior Fixer patch was present to replace; the worktree stayed clean.
## Git Add Paths
None
## Validation
`make` from the workspace root failed before building munin code because `Module::Build` is missing:
`Can't locate Module/Build.pm in @INC ... at Build.PL line 80.`
`make check` is not available:
`make: *** No rule to make target 'check'. Stop.`
Focused checks:
`perl -T -Ilib -c script/munin-node` passed.
`perl -Ilib -c lib/Munin/Node/Server.pm` passed.
`perl -Ilib -c lib/Munin/Common/Timeout.pm` passed.
`perl -Ilib -c lib/Munin/Node/OS.pm` passed, with existing subroutine redefinition warnings.
Independent reproduction attempts were blocked, so I did not claim `reproduced`. `strace -ttT -f ...` failed with ptrace denied: `Operation not permitted`. A foreground `munin-node` smoke run with an empty temporary config failed because the sandbox disallowed binding a TCP listener: `Cannot bind and listen to TCP port 0 on * [Operation not permitted]`.
## Review Pass 1
RESULT: ok
No source patch is present in the workspace, and the author’s no-patch diagnosis is consistent with the evidence. The report does not overclaim reproduction, keeps `## Evidence Confidence` to an allowed value, and explains why the observed two-second `pselect6` waits are not enough to justify changing munin’s timing behavior.
Validation is acceptable for a no-patch report: `make` was attempted and failed on missing `Module::Build`, `make check` was attempted and found unavailable, and focused syntax checks plus blocked reproduction attempts were reported with concrete blockers.perl likely remains stuck in a busy-poll loop. A diagnosis report and patch proposal were created locally.
## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.
## Patch Pass
You are working on a bounded fixer proposal.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Produce the smallest reasonable patch for the target repository, keep the change upstreamable, prefer the clearest control flow available, and do not keep avoidable `goto` when a simpler structure would read better. Before introducing new file, process, allocation, locking, networking, or platform APIs, inspect nearby code and project contribution docs for existing helpers or compatibility wrappers and use those local patterns unless you can explain why they do not fit. Validate from a reproducible workspace-root entrypoint before falling back to focused leaf commands; if a build or test cannot run, report the exact command, the exact blocker, and any narrower check you ran instead. During validation, also try one bounded independent reproduction of the collected failure signal when it is safe and cheap, such as a failing test, smoke command, perf/strace comparison, or before/after runtime check. Only use `reproduced` if that command or test actually reproduced the failure; otherwise keep `observed` and report the reproduction blocker. The final explanation must connect the observed issue evidence to the actual code change, not just paraphrase the diff. Write like a maintainer is going to read the patch mail cold: explain the bug in plain language, define subsystem-specific jargon the first time you need it, and make the causal story obvious. Explicitly classify evidence confidence as `reproduced`, `observed`, or `inferred`: `reproduced` means you reproduced the failure locally; `observed` means Fixer has direct crash/log/trace evidence but you did not independently reproduce it; `inferred` means the source patch is not pull-request-ready, so do not leave a source diff unless you first gather stronger observed/reproduced evidence; otherwise return a no-patch diagnosis/report. For any source-changing `observed` patch, say explicitly in `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. Security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior need reproduced evidence plus explicit security-impact analysis before leaving a source diff; otherwise return a no-patch diagnosis/report for human review. If you introduce non-obvious state translation, index remapping, or backend split logic, add a short source comment that explains the invariant being preserved.
Start by explaining the likely root cause from the collected perf, strace, and /proc evidence. If you cannot land a safe patch, leave a diagnosis that is strong enough for an upstream bug report.
Interpreter process expectation: when the hot process is Python, Perl, shell, Node, Ruby, PHP, Lua, or another interpreter, inspect both the runtime and the script/application entrypoint from `details.interpreter_process`. Prefer the script or application package when evidence points there; do not patch the interpreter runtime merely because the hot binary is `python`, `perl`, `bash`, or similar. Runtime fixes are welcome only after checking the entrypoint and explaining why the runtime mishandles the workload or why running bad code faster/safer is itself the right upstream fix.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Keep the change narrowly scoped and summarize validation clearly.
In every authoring pass, your final response must start with `Subject: <single-line git commit subject>` and then include these markdown sections exactly:
## Commit Message
A short upstream-friendly explanation of what changed and why. Write it in plain language that a maintainer can follow without local complaint context. If you use subsystem jargon, define it immediately.
## Evidence Confidence
Exactly one word: `reproduced`, `observed`, or `inferred`. Use `reproduced` only when you reproduced the failure locally with a command or test, and include that command/test in `## Validation`. Use `observed` when Fixer has direct crash/log/trace evidence but you did not independently reproduce it. If `## Git Add Paths` lists source files for an `observed` patch, `## Issue Connection` must explicitly say the failure was observed by Fixer and not independently reproduced. Security-sensitive source changes touching authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior require reproduced evidence and explicit security-impact analysis; otherwise list `None` under `## Git Add Paths` and write a no-patch diagnosis/report. Use `inferred` for profiler/strace/indirect evidence; inferred responses may be no-patch diagnoses or reports, but inferred source patches are not pull-request-ready until stronger evidence is gathered.
## Issue Connection
Write this as maintainer-facing patch mail, not as local Fixer notes. Cover four things explicitly in readable sentences: the user-visible symptom or the exact collected signal, the code-level cause or the cautious inference from evidence, the specific change you made, and the expected effect. Do not invent a reproducer, command line, crash, or user-visible failure that is not present in the evidence bundle. If the evidence is direct-but-not-reproduced, say it was observed by Fixer and not independently reproduced. If the evidence is indirect and you did not gather stronger evidence, do not leave a source diff; write a no-patch diagnosis/report instead. Include an explicit effect sentence such as `The expected effect is ...`, `This should reduce ...`, or `This prevents ...` for source patches. If the logic is non-obvious in code, mention that you added a short explanatory comment.
## Git Add Paths
List the repo-relative paths that belong in the final patch, one per line. Use `None` only when you intentionally made no source changes. Include intentionally new files, and do not list generated build artifacts.
## Validation
List the checks you ran, or say clearly that you could not run them. Include the independent reproduction command/test and result when `## Evidence Confidence` is `reproduced`; if reproduction was attempted but blocked, name the exact blocker and keep confidence at `observed` or `inferred`.
Before editing, read the plan at `./plan-output.txt` and follow it unless the code proves part of it wrong. If you change course, say so explicitly in the final write-up instead of silently drifting from the plan.
## Review Pass 1
You are reviewing a freshly generated fixer patch.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Review the first patch pass. The original pre-edit snapshot is available at `./source` for diffing.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout. The latest author response is at `./patch-output.txt`. Inspect the current code and changed paths like a strict code reviewer. Focus on correctness, regressions, maintainability, awkward control flow such as avoidable `goto`, missing validation, weak or non-gittable commit message text, and explanations that fail to connect the observed issue evidence to the code change. Also review the maintainer experience: the patch mail should be easy to accept upstream, the user-visible bug should be explained in plain language, subsystem-specific jargon should be defined when first used, and any non-obvious state translation or index remapping in code should have a short explanatory comment. Reject patches that omit `## Evidence Confidence`, use anything other than `reproduced`, `observed`, or `inferred`, or sound more certain than that evidence level allows. Reject patches that claim `reproduced` unless `## Validation` names the concrete reproduction command or test and its result. Reject source patches in security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior unless the author reproduced the behavior and explicitly analyzed the security impact of the change; observed-only evidence should become a diagnosis/report, not a PR-ready source diff. Reject patches that invent a reproducer, command line, crash, or user-visible failure not present in the evidence bundle; indirect profiler or strace evidence may justify a cautious mitigation, but the author must say it is indirect instead of presenting it as a confirmed upstream bug. Reject patches that introduce generic libc/std APIs when nearby code or project docs provide a local compat/helper API for the same job, unless the author explicitly justifies the exception. Reject validation that only reports a leaf object/syntax build when a project-level configure/build/test entrypoint exists and was not attempted; if a full build cannot run, the author must show the exact failed command and blocker.
Do not apply code changes in this pass.
Return a short markdown review report. The first non-empty line must be exactly one of:
RESULT: ok
RESULT: fix-needed
If you choose `RESULT: fix-needed`, add a `## Findings` section with concrete, actionable items.## Plan Pass
## Problem
Fixer observed `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` in repeated `pselect6` samples, but the retained artifacts show a sleeping `munin-node`, `max_cpu_percent` 0.9, `wchan` in `poll_schedule_timeout`, and `strace` timeouts of about 1.8 to 2.0 seconds. In this codebase, `munin-node` runs `Munin::Node::Server`, which subclasses `Net::Server::Fork`; that runtime’s accept loop waits with `can_read(2)`, matching the observed 2-second `pselect6` cadence.
## Evidence Confidence
observed
## Proposed Subject
No source patch: document that the collected signal matches normal idle `munin-node` accept-loop polling, not a proven busy loop.
## Patch Plan
Do not edit source from this evidence alone. The evidence lacks a Perl-level stack or command/session trace tying CPU burn to `script/munin-node`, `Munin::Node::Server::_net_read`, plugin execution, or `Munin::Common::Timeout`.
If later evidence shows actual CPU burn, investigate in this order: `script/munin-node`, `lib/Munin/Node/Server.pm`, then plugin spawning through `Munin::Node::Service->fork_service` and `Munin::Node::OS->run_as_child`; only inspect Perl runtime behavior after proving application code is not responsible.
Follow local maintainer conventions from `CONTRIBUTING.md` and `HACKING.pod`: strict/warnings Perl, taint-aware scripts, `English` variable names where applicable, no new warnings, one statement per line, and existing style in touched files. Relevant local helpers/conventions found: `Munin::Common::Timeout::do_with_timeout` for bounded operations, `Munin::Common::Logger` for logging, and `Munin::Node::Service`/`Munin::Node::OS` wrappers for plugin process execution. No prior Fixer patch was present; only Debian quilt patches were applied.
Reject adding sleeps, changing Net::Server polling, or adding avoidable control-flow workarounds such as `goto`; that would alter timing behavior without a reproduced bug.
## Risks
A no-patch diagnosis can miss an intermittent issue that was not captured in the short profile. A speculative timing patch would be riskier: it could change daemon responsiveness, signal handling, or child management in `Net::Server::Fork` without proving a Munin defect.
## Validation
Before any focused check, try the project entrypoint from the workspace root: `make`. If a `check` target is available, try `make check`; in this tree the visible project test target is `make test`.
Bounded independent reproduction attempt: after `make` generates runtime files, start `munin-node` with a temporary config, empty plugin directories, `--foreground`, and an isolated localhost port under `timeout` plus `strace -ttT -f -e trace=pselect6,select,poll,ppoll`. Confirm whether idle behavior reproduces the observed 2-second blocking `pselect6` calls and low CPU. Do not claim `reproduced` unless that command demonstrates the same failure signal.
## Patch Pass
Subject: Diagnose munin-node idle poll evidence
## Commit Message
No source change is included. The collected `pselect6` samples match `munin-node` waiting in the `Net::Server::Fork` accept loop, not a demonstrated Munin or Perl busy loop.
## Evidence Confidence
inferred
## Issue Connection
Fixer collected profiler, `/proc`, and `strace` evidence for `/usr/bin/perl -wT /usr/sbin/munin-node --foreground`: the process was in state `S (sleeping)`, `wchan` was `poll_schedule_timeout`, CPU was reported around 0.9%, and the captured `pselect6` calls blocked for roughly 1.8 to 2.0 seconds.
The cautious code-level inference is that this is normal idle server behavior. `script/munin-node` runs `Munin::Node::Server`, which subclasses `Net::Server::Fork`; that runtime calls `can_read(2)` in its accept loop, which explains the repeated two-second poll-family syscalls. The evidence bundle does not include a Perl-level stack, a session trace, a plugin trace, or reproduced CPU burn tying the signal to Munin application logic.
I followed the saved plan’s no-patch direction. I am classifying this as `inferred` under the stricter final instruction because the remaining failure signal is profiler/strace-style evidence and I could not independently reproduce a failing behavior in this sandbox. No source diff was left, because changing Munin or Net::Server timing from this evidence would be speculative and would touch timing behavior without reproduced impact.
The expected effect is no behavior change in Munin; this diagnosis gives upstream a narrower report: collect a Perl-level stack or a live `strace`/CPU sample during actual CPU burn before proposing a source patch. I inspected `CONTRIBUTING.md`, `HACKING.pod`, `script/munin-node`, `lib/Munin/Node/Server.pm`, and nearby helpers. Relevant local conventions/helpers are `Munin::Common::Timeout::do_with_timeout`, `Munin::Common::Logger`, and plugin execution through `Munin::Node::Service` and `Munin::Node::OS`.
## Git Add Paths
None
## Validation
`make` from the workspace root failed before building:
`Can't locate Module/Build.pm in @INC ... at Build.PL line 80`, followed by `make: *** [Makefile:149: Build] Error 2`.
`make check` failed because this tree has no such target:
`make: *** No rule to make target 'check'. Stop.`
Focused syntax check passed:
`perl -T -c -Ilib script/munin-node`
reported `script/munin-node syntax OK`.
Independent reproduction attempt with `strace` was blocked by sandbox ptrace restrictions:
`strace: do_test_ptrace_get_syscall_info: PTRACE_TRACEME: Operation not permitted`
and
`strace: attach: ptrace(PTRACE_SEIZE, 8): Operation not permitted`.
A fallback idle `munin-node` smoke run with temporary config and empty plugin directories was also blocked by sandbox networking:
`Cannot bind and listen to TCP port 14951 on 127.0.0.1 [Operation not permitted]`.
## Review Pass 1
RESULT: ok
No findings.
The first pass leaves no source diff, lists `Git Add Paths` as `None`, and its `inferred` evidence confidence is appropriate for a no-patch diagnosis based on profiler/strace-style evidence that was not independently reproduced. The write-up does not overclaim a confirmed Munin bug, connects the collected `pselect6`/`wchan`/CPU signal to the `Net::Server::Fork` accept-loop inference, and reports the project-level validation attempts and blockers clearly.perl likely remains stuck in a busy-poll loop. A diagnosis report and patch proposal were created locally.
## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.
## Patch Pass
You are working on a bounded fixer proposal.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Produce the smallest reasonable patch for the target repository, keep the change upstreamable, prefer the clearest control flow available, and do not keep avoidable `goto` when a simpler structure would read better. Before introducing new file, process, allocation, locking, networking, or platform APIs, inspect nearby code and project contribution docs for existing helpers or compatibility wrappers and use those local patterns unless you can explain why they do not fit. Validate from a reproducible workspace-root entrypoint before falling back to focused leaf commands; if a build or test cannot run, report the exact command, the exact blocker, and any narrower check you ran instead. During validation, also try one bounded independent reproduction of the collected failure signal when it is safe and cheap, such as a failing test, smoke command, perf/strace comparison, or before/after runtime check. Only use `reproduced` if that command or test actually reproduced the failure; otherwise keep `observed` and report the reproduction blocker. The final explanation must connect the observed issue evidence to the actual code change, not just paraphrase the diff. Write like a maintainer is going to read the patch mail cold: explain the bug in plain language, define subsystem-specific jargon the first time you need it, and make the causal story obvious. Explicitly classify evidence confidence as `reproduced`, `observed`, or `inferred`: `reproduced` means you reproduced the failure locally; `observed` means Fixer has direct crash/log/trace evidence but you did not independently reproduce it; `inferred` means the source patch is not pull-request-ready, so do not leave a source diff unless you first gather stronger observed/reproduced evidence; otherwise return a no-patch diagnosis/report. For any source-changing `observed` patch, say explicitly in `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. Security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior need reproduced evidence plus explicit security-impact analysis before leaving a source diff; otherwise return a no-patch diagnosis/report for human review. If you introduce non-obvious state translation, index remapping, or backend split logic, add a short source comment that explains the invariant being preserved.
Start by explaining the likely root cause from the collected perf, strace, and /proc evidence. If you cannot land a safe patch, leave a diagnosis that is strong enough for an upstream bug report.
Interpreter process expectation: when the hot process is Python, Perl, shell, Node, Ruby, PHP, Lua, or another interpreter, inspect both the runtime and the script/application entrypoint from `details.interpreter_process`. Prefer the script or application package when evidence points there; do not patch the interpreter runtime merely because the hot binary is `python`, `perl`, `bash`, or similar. Runtime fixes are welcome only after checking the entrypoint and explaining why the runtime mishandles the workload or why running bad code faster/safer is itself the right upstream fix.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Keep the change narrowly scoped and summarize validation clearly.
In every authoring pass, your final response must start with `Subject: <single-line git commit subject>` and then include these markdown sections exactly:
## Commit Message
A short upstream-friendly explanation of what changed and why. Write it in plain language that a maintainer can follow without local complaint context. If you use subsystem jargon, define it immediately.
## Evidence Confidence
Exactly one word: `reproduced`, `observed`, or `inferred`. Use `reproduced` only when you reproduced the failure locally with a command or test, and include that command/test in `## Validation`. Use `observed` when Fixer has direct crash/log/trace evidence but you did not independently reproduce it. If `## Git Add Paths` lists source files for an `observed` patch, `## Issue Connection` must explicitly say the failure was observed by Fixer and not independently reproduced. Security-sensitive source changes touching authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior require reproduced evidence and explicit security-impact analysis; otherwise list `None` under `## Git Add Paths` and write a no-patch diagnosis/report. Use `inferred` for profiler/strace/indirect evidence; inferred responses may be no-patch diagnoses or reports, but inferred source patches are not pull-request-ready until stronger evidence is gathered.
## Issue Connection
Write this as maintainer-facing patch mail, not as local Fixer notes. Cover four things explicitly in readable sentences: the user-visible symptom or the exact collected signal, the code-level cause or the cautious inference from evidence, the specific change you made, and the expected effect. Do not invent a reproducer, command line, crash, or user-visible failure that is not present in the evidence bundle. If the evidence is direct-but-not-reproduced, say it was observed by Fixer and not independently reproduced. If the evidence is indirect and you did not gather stronger evidence, do not leave a source diff; write a no-patch diagnosis/report instead. Include an explicit effect sentence such as `The expected effect is ...`, `This should reduce ...`, or `This prevents ...` for source patches. If the logic is non-obvious in code, mention that you added a short explanatory comment.
## Git Add Paths
List the repo-relative paths that belong in the final patch, one per line. Use `None` only when you intentionally made no source changes. Include intentionally new files, and do not list generated build artifacts.
## Validation
List the checks you ran, or say clearly that you could not run them. Include the independent reproduction command/test and result when `## Evidence Confidence` is `reproduced`; if reproduction was attempted but blocked, name the exact blocker and keep confidence at `observed` or `inferred`.
Before editing, read the plan at `./plan-output.txt` and follow it unless the code proves part of it wrong. If you change course, say so explicitly in the final write-up instead of silently drifting from the plan.
## Review Pass 1
You are reviewing a freshly generated fixer patch.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Review the first patch pass. The original pre-edit snapshot is available at `./source` for diffing.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout. The latest author response is at `./patch-output.txt`. Inspect the current code and changed paths like a strict code reviewer. Focus on correctness, regressions, maintainability, awkward control flow such as avoidable `goto`, missing validation, weak or non-gittable commit message text, and explanations that fail to connect the observed issue evidence to the code change. Also review the maintainer experience: the patch mail should be easy to accept upstream, the user-visible bug should be explained in plain language, subsystem-specific jargon should be defined when first used, and any non-obvious state translation or index remapping in code should have a short explanatory comment. Reject patches that omit `## Evidence Confidence`, use anything other than `reproduced`, `observed`, or `inferred`, or sound more certain than that evidence level allows. Reject patches that claim `reproduced` unless `## Validation` names the concrete reproduction command or test and its result. Reject source patches in security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior unless the author reproduced the behavior and explicitly analyzed the security impact of the change; observed-only evidence should become a diagnosis/report, not a PR-ready source diff. Reject patches that invent a reproducer, command line, crash, or user-visible failure not present in the evidence bundle; indirect profiler or strace evidence may justify a cautious mitigation, but the author must say it is indirect instead of presenting it as a confirmed upstream bug. Reject patches that introduce generic libc/std APIs when nearby code or project docs provide a local compat/helper API for the same job, unless the author explicitly justifies the exception. Reject validation that only reports a leaf object/syntax build when a project-level configure/build/test entrypoint exists and was not attempted; if a full build cannot run, the author must show the exact failed command and blocker.
Do not apply code changes in this pass.
Return a short markdown review report. The first non-empty line must be exactly one of:
RESULT: ok
RESULT: fix-needed
If you choose `RESULT: fix-needed`, add a `## Findings` section with concrete, actionable items.## Plan Pass
## Problem
Fixer observed `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` in repeated `pselect6` samples, but the retained artifacts show a sleeping `munin-node`, `max_cpu_percent` 0.9, `wchan` in `poll_schedule_timeout`, and `strace` timeouts of about 1.8 to 2.0 seconds. In this codebase, `munin-node` runs `Munin::Node::Server`, which subclasses `Net::Server::Fork`; that runtime’s accept loop waits with `can_read(2)`, matching the observed 2-second `pselect6` cadence.
## Evidence Confidence
observed
## Proposed Subject
No source patch: document that the collected signal matches normal idle `munin-node` accept-loop polling, not a proven busy loop.
## Patch Plan
Do not edit source from this evidence alone. The evidence lacks a Perl-level stack or command/session trace tying CPU burn to `script/munin-node`, `Munin::Node::Server::_net_read`, plugin execution, or `Munin::Common::Timeout`.
If later evidence shows actual CPU burn, investigate in this order: `script/munin-node`, `lib/Munin/Node/Server.pm`, then plugin spawning through `Munin::Node::Service->fork_service` and `Munin::Node::OS->run_as_child`; only inspect Perl runtime behavior after proving application code is not responsible.
Follow local maintainer conventions from `CONTRIBUTING.md` and `HACKING.pod`: strict/warnings Perl, taint-aware scripts, `English` variable names where applicable, no new warnings, one statement per line, and existing style in touched files. Relevant local helpers/conventions found: `Munin::Common::Timeout::do_with_timeout` for bounded operations, `Munin::Common::Logger` for logging, and `Munin::Node::Service`/`Munin::Node::OS` wrappers for plugin process execution. No prior Fixer patch was present; only Debian quilt patches were applied.
Reject adding sleeps, changing Net::Server polling, or adding avoidable control-flow workarounds such as `goto`; that would alter timing behavior without a reproduced bug.
## Risks
A no-patch diagnosis can miss an intermittent issue that was not captured in the short profile. A speculative timing patch would be riskier: it could change daemon responsiveness, signal handling, or child management in `Net::Server::Fork` without proving a Munin defect.
## Validation
Before any focused check, try the project entrypoint from the workspace root: `make`. If a `check` target is available, try `make check`; in this tree the visible project test target is `make test`.
Bounded independent reproduction attempt: after `make` generates runtime files, start `munin-node` with a temporary config, empty plugin directories, `--foreground`, and an isolated localhost port under `timeout` plus `strace -ttT -f -e trace=pselect6,select,poll,ppoll`. Confirm whether idle behavior reproduces the observed 2-second blocking `pselect6` calls and low CPU. Do not claim `reproduced` unless that command demonstrates the same failure signal.
## Patch Pass
Subject: Diagnose munin-node idle poll evidence
## Commit Message
No source change is included. The collected `pselect6` samples match `munin-node` waiting in the `Net::Server::Fork` accept loop, not a demonstrated Munin or Perl busy loop.
## Evidence Confidence
inferred
## Issue Connection
Fixer collected profiler, `/proc`, and `strace` evidence for `/usr/bin/perl -wT /usr/sbin/munin-node --foreground`: the process was in state `S (sleeping)`, `wchan` was `poll_schedule_timeout`, CPU was reported around 0.9%, and the captured `pselect6` calls blocked for roughly 1.8 to 2.0 seconds.
The cautious code-level inference is that this is normal idle server behavior. `script/munin-node` runs `Munin::Node::Server`, which subclasses `Net::Server::Fork`; that runtime calls `can_read(2)` in its accept loop, which explains the repeated two-second poll-family syscalls. The evidence bundle does not include a Perl-level stack, a session trace, a plugin trace, or reproduced CPU burn tying the signal to Munin application logic.
I followed the saved plan’s no-patch direction. I am classifying this as `inferred` under the stricter final instruction because the remaining failure signal is profiler/strace-style evidence and I could not independently reproduce a failing behavior in this sandbox. No source diff was left, because changing Munin or Net::Server timing from this evidence would be speculative and would touch timing behavior without reproduced impact.
The expected effect is no behavior change in Munin; this diagnosis gives upstream a narrower report: collect a Perl-level stack or a live `strace`/CPU sample during actual CPU burn before proposing a source patch. I inspected `CONTRIBUTING.md`, `HACKING.pod`, `script/munin-node`, `lib/Munin/Node/Server.pm`, and nearby helpers. Relevant local conventions/helpers are `Munin::Common::Timeout::do_with_timeout`, `Munin::Common::Logger`, and plugin execution through `Munin::Node::Service` and `Munin::Node::OS`.
## Git Add Paths
None
## Validation
`make` from the workspace root failed before building:
`Can't locate Module/Build.pm in @INC ... at Build.PL line 80`, followed by `make: *** [Makefile:149: Build] Error 2`.
`make check` failed because this tree has no such target:
`make: *** No rule to make target 'check'. Stop.`
Focused syntax check passed:
`perl -T -c -Ilib script/munin-node`
reported `script/munin-node syntax OK`.
Independent reproduction attempt with `strace` was blocked by sandbox ptrace restrictions:
`strace: do_test_ptrace_get_syscall_info: PTRACE_TRACEME: Operation not permitted`
and
`strace: attach: ptrace(PTRACE_SEIZE, 8): Operation not permitted`.
A fallback idle `munin-node` smoke run with temporary config and empty plugin directories was also blocked by sandbox networking:
`Cannot bind and listen to TCP port 14951 on 127.0.0.1 [Operation not permitted]`.
## Review Pass 1
RESULT: ok
No findings.
The first pass leaves no source diff, lists `Git Add Paths` as `None`, and its `inferred` evidence confidence is appropriate for a no-patch diagnosis based on profiler/strace-style evidence that was not independently reproduced. The write-up does not overclaim a confirmed Munin bug, connects the collected `pselect6`/`wchan`/CPU signal to the `Net::Server::Fork` accept-loop inference, and reports the project-level validation attempts and blockers clearly.perl likely remains stuck in a busy-poll loop. A diagnosis report and patch proposal were created locally.
## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.
## Patch Pass
You are working on a bounded fixer proposal.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Produce the smallest reasonable patch for the target repository, keep the change upstreamable, prefer the clearest control flow available, and do not keep avoidable `goto` when a simpler structure would read better. Before introducing new file, process, allocation, locking, networking, or platform APIs, inspect nearby code and project contribution docs for existing helpers or compatibility wrappers and use those local patterns unless you can explain why they do not fit. Validate from a reproducible workspace-root entrypoint before falling back to focused leaf commands; if a build or test cannot run, report the exact command, the exact blocker, and any narrower check you ran instead. During validation, also try one bounded independent reproduction of the collected failure signal when it is safe and cheap, such as a failing test, smoke command, perf/strace comparison, or before/after runtime check. Only use `reproduced` if that command or test actually reproduced the failure; otherwise keep `observed` and report the reproduction blocker. The final explanation must connect the observed issue evidence to the actual code change, not just paraphrase the diff. Write like a maintainer is going to read the patch mail cold: explain the bug in plain language, define subsystem-specific jargon the first time you need it, and make the causal story obvious. Explicitly classify evidence confidence as `reproduced`, `observed`, or `inferred`: `reproduced` means you reproduced the failure locally; `observed` means Fixer has direct crash/log/trace evidence but you did not independently reproduce it; `inferred` means the source patch is not pull-request-ready, so do not leave a source diff unless you first gather stronger observed/reproduced evidence; otherwise return a no-patch diagnosis/report. For any source-changing `observed` patch, say explicitly in `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. Security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior need reproduced evidence plus explicit security-impact analysis before leaving a source diff; otherwise return a no-patch diagnosis/report for human review. If you introduce non-obvious state translation, index remapping, or backend split logic, add a short source comment that explains the invariant being preserved.
Start by explaining the likely root cause from the collected perf, strace, and /proc evidence. If you cannot land a safe patch, leave a diagnosis that is strong enough for an upstream bug report.
Interpreter process expectation: when the hot process is Python, Perl, shell, Node, Ruby, PHP, Lua, or another interpreter, inspect both the runtime and the script/application entrypoint from `details.interpreter_process`. Prefer the script or application package when evidence points there; do not patch the interpreter runtime merely because the hot binary is `python`, `perl`, `bash`, or similar. Runtime fixes are welcome only after checking the entrypoint and explaining why the runtime mishandles the workload or why running bad code faster/safer is itself the right upstream fix.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Keep the change narrowly scoped and summarize validation clearly.
In every authoring pass, your final response must start with `Subject: <single-line git commit subject>` and then include these markdown sections exactly:
## Commit Message
A short upstream-friendly explanation of what changed and why. Write it in plain language that a maintainer can follow without local complaint context. If you use subsystem jargon, define it immediately.
## Evidence Confidence
Exactly one word: `reproduced`, `observed`, or `inferred`. Use `reproduced` only when you reproduced the failure locally with a command or test, and include that command/test in `## Validation`. Use `observed` when Fixer has direct crash/log/trace evidence but you did not independently reproduce it. If `## Git Add Paths` lists source files for an `observed` patch, `## Issue Connection` must explicitly say the failure was observed by Fixer and not independently reproduced. Security-sensitive source changes touching authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior require reproduced evidence and explicit security-impact analysis; otherwise list `None` under `## Git Add Paths` and write a no-patch diagnosis/report. Use `inferred` for profiler/strace/indirect evidence; inferred responses may be no-patch diagnoses or reports, but inferred source patches are not pull-request-ready until stronger evidence is gathered.
## Issue Connection
Write this as maintainer-facing patch mail, not as local Fixer notes. Cover four things explicitly in readable sentences: the user-visible symptom or the exact collected signal, the code-level cause or the cautious inference from evidence, the specific change you made, and the expected effect. Do not invent a reproducer, command line, crash, or user-visible failure that is not present in the evidence bundle. If the evidence is direct-but-not-reproduced, say it was observed by Fixer and not independently reproduced. If the evidence is indirect and you did not gather stronger evidence, do not leave a source diff; write a no-patch diagnosis/report instead. Include an explicit effect sentence such as `The expected effect is ...`, `This should reduce ...`, or `This prevents ...` for source patches. If the logic is non-obvious in code, mention that you added a short explanatory comment.
## Git Add Paths
List the repo-relative paths that belong in the final patch, one per line. Use `None` only when you intentionally made no source changes. Include intentionally new files, and do not list generated build artifacts.
## Validation
List the checks you ran, or say clearly that you could not run them. Include the independent reproduction command/test and result when `## Evidence Confidence` is `reproduced`; if reproduction was attempted but blocked, name the exact blocker and keep confidence at `observed` or `inferred`.
Before editing, read the plan at `./plan-output.txt` and follow it unless the code proves part of it wrong. If you change course, say so explicitly in the final write-up instead of silently drifting from the plan.
## Review Pass 1
You are reviewing a freshly generated fixer patch.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Review the first patch pass. The original pre-edit snapshot is available at `./source` for diffing.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout. The latest author response is at `./patch-output.txt`. Inspect the current code and changed paths like a strict code reviewer. Focus on correctness, regressions, maintainability, awkward control flow such as avoidable `goto`, missing validation, weak or non-gittable commit message text, and explanations that fail to connect the observed issue evidence to the code change. Also review the maintainer experience: the patch mail should be easy to accept upstream, the user-visible bug should be explained in plain language, subsystem-specific jargon should be defined when first used, and any non-obvious state translation or index remapping in code should have a short explanatory comment. Reject patches that omit `## Evidence Confidence`, use anything other than `reproduced`, `observed`, or `inferred`, or sound more certain than that evidence level allows. Reject patches that claim `reproduced` unless `## Validation` names the concrete reproduction command or test and its result. Reject source patches in security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior unless the author reproduced the behavior and explicitly analyzed the security impact of the change; observed-only evidence should become a diagnosis/report, not a PR-ready source diff. Reject patches that invent a reproducer, command line, crash, or user-visible failure not present in the evidence bundle; indirect profiler or strace evidence may justify a cautious mitigation, but the author must say it is indirect instead of presenting it as a confirmed upstream bug. Reject patches that introduce generic libc/std APIs when nearby code or project docs provide a local compat/helper API for the same job, unless the author explicitly justifies the exception. Reject validation that only reports a leaf object/syntax build when a project-level configure/build/test entrypoint exists and was not attempted; if a full build cannot run, the author must show the exact failed command and blocker.
Do not apply code changes in this pass.
Return a short markdown review report. The first non-empty line must be exactly one of:
RESULT: ok
RESULT: fix-needed
If you choose `RESULT: fix-needed`, add a `## Findings` section with concrete, actionable items.## Plan Pass
## Problem
Fixer observed `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` in repeated `pselect6` calls. The retained strace shows 1.8-2.0 second blocking timeouts and process state `S (sleeping)`, with only ~0.9% CPU, so the bundle does not prove a tight application-level CPU loop.
## Evidence Confidence
inferred
## Proposed Subject
No source patch yet: diagnose the signal as likely idle `Net::Server::Fork` accept-loop polling unless an independent reproduction shows harmful CPU usage or a Munin-specific loop.
## Patch Plan
Do not edit in this pass. If later evidence proves a Munin bug, inspect `script/munin-node` and `lib/Munin/Node/Server.pm` first, because the entrypoint delegates to `Munin::Node::Server->run`.
Relevant local conventions found: `CONTRIBUTING.md` points to `HACKING.pod`; new Perl should use `strict`, `warnings`, taint-compatible style, `English qw(-no_match_vars)`, one statement per line, and local logging via `Munin::Common::Logger`. Relevant local helper found: request/plugin timeouts use `Munin::Common::Timeout::do_with_timeout`; daemon readiness uses `Munin::Common::Daemon::emit_sd_notify_message`. No Munin wrapper was found for the parent accept loop; that comes from `Net::Server::Fork`.
Current evidence maps cleanly to `Net::Server::Fork::accept`, which calls `can_read(2)` on the listening sockets. That produces periodic `select`/`pselect6` timeouts during normal idle operation, so a patch to add sleeps, gotos, or alternate control flow in Munin would be awkward and unjustified without more evidence. No prior Fixer patch was present to improve or replace; the workspace matches the original snapshot for the inspected files.
## Risks
Changing the accept loop without reproduction could reduce connection responsiveness, break signal/HUP handling inherited from `Net::Server::Fork`, or mask normal idle behavior as a bug fix. This area is not auth/crypto/permission-sensitive, but it is daemon timing behavior, so a source patch needs a reproducible impact measurement first.
## Validation
Before any focused check after a real patch, run project-level `make` from the workspace root, then `make check` only if a check target exists; otherwise use `make test`.
Bounded independent reproduction to collect before editing: start `script/munin-node --foreground` with a temporary config on a high localhost port and empty plugin dirs, attach `strace -ttT -f -e trace=pselect6,select,poll,ppoll`, and verify whether idle behavior is just 2-second blocking `pselect6` calls with low CPU. Focused fallback checks would be `perl -Ilib -c script/munin-node` and `perl -Ilib -c lib/Munin/Node/Server.pm`.
## Patch Pass
Subject: Diagnose idle munin-node select evidence
## Commit Message
No source change. The collected signal is better explained as `munin-node` sleeping in the `Net::Server::Fork` accept loop, which is the loop that waits for incoming client connections, than as a proven Munin CPU bug.
## Evidence Confidence
inferred
## Issue Connection
Fixer observed `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` repeatedly in `pselect6`, with a native stack under Perl and `select()`. The same bundle also shows `pselect6` calls blocking for about 1.8-2.0 seconds, process state `S (sleeping)`, wait channel `poll_schedule_timeout`, and only about 0.9% CPU.
The likely root cause is a false-positive “busy poll” classification of normal idle server waiting. `script/munin-node` delegates to `Munin::Node::Server`, which subclasses `Net::Server::Fork`; that parent server uses a 2-second readable-socket wait in its accept loop. I did not patch Perl itself, because the interpreter evidence points to the Munin script entrypoint first and does not show a runtime bug.
No code change was made. This follows the saved plan: the evidence is profiler/strace/proc evidence without a Perl-level stack or local reproduction of harmful CPU use, and changing daemon timing behavior without reproduced impact would be unsafe. The expected effect is no repository diff; this should be handled as an upstream diagnosis unless stronger evidence shows actual CPU runaway or a Munin-specific loop.
Project conventions checked: `CONTRIBUTING.md` points to `HACKING.pod`; relevant local helpers include `Munin::Common::Timeout::do_with_timeout`, `Munin::Common::Daemon::emit_sd_notify_message`, and `Munin::Common::Logger`. No Munin helper wraps the parent `Net::Server::Fork` accept loop.
## Git Add Paths
None
## Validation
`make` from the workspace root failed before tests because `Module::Build` is missing:
`Can't locate Module/Build.pm in @INC ... at Build.PL line 80.`
`make -n check` failed because there is no `check` target:
`make: *** No rule to make target 'check'. Stop.`
Focused checks:
`perl -Ilib -c lib/Munin/Node/Server.pm` passed.
`perl -T -Ilib -c script/munin-node` passed.
Independent reproduction attempt:
Tried to run workspace `script/munin-node --foreground` with a temporary config on `127.0.0.1:24949` and attach `strace`, but the sandbox blocked listening sockets: `Cannot bind and listen to TCP port 24949 on 127.0.0.1 [Operation not permitted]`. Confidence remains `inferred`; no source patch was left.
## Review Pass 1
RESULT: ok
No source diff is present, and the author correctly treated the profiler/strace evidence as indirect rather than leaving a speculative timing/daemon-loop patch. The response includes the required evidence confidence, keeps it at `inferred`, explains the likely `Net::Server::Fork` idle accept-loop cause, lists `None` for git paths, and reports project-level validation blockers before focused syntax checks.perl likely remains stuck in a busy-poll loop. A diagnosis report and patch proposal were created locally.
## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.
## Patch Pass
You are working on a bounded fixer proposal.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Produce the smallest reasonable patch for the target repository, keep the change upstreamable, prefer the clearest control flow available, and do not keep avoidable `goto` when a simpler structure would read better. Before introducing new file, process, allocation, locking, networking, or platform APIs, inspect nearby code and project contribution docs for existing helpers or compatibility wrappers and use those local patterns unless you can explain why they do not fit. Validate from a reproducible workspace-root entrypoint before falling back to focused leaf commands; if a build or test cannot run, report the exact command, the exact blocker, and any narrower check you ran instead. During validation, also try one bounded independent reproduction of the collected failure signal when it is safe and cheap, such as a failing test, smoke command, perf/strace comparison, or before/after runtime check. Only use `reproduced` if that command or test actually reproduced the failure; otherwise keep `observed` and report the reproduction blocker. The final explanation must connect the observed issue evidence to the actual code change, not just paraphrase the diff. Write like a maintainer is going to read the patch mail cold: explain the bug in plain language, define subsystem-specific jargon the first time you need it, and make the causal story obvious. Explicitly classify evidence confidence as `reproduced`, `observed`, or `inferred`: `reproduced` means you reproduced the failure locally; `observed` means Fixer has direct crash/log/trace evidence but you did not independently reproduce it; `inferred` means the source patch is not pull-request-ready, so do not leave a source diff unless you first gather stronger observed/reproduced evidence; otherwise return a no-patch diagnosis/report. For any source-changing `observed` patch, say explicitly in `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. Security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior need reproduced evidence plus explicit security-impact analysis before leaving a source diff; otherwise return a no-patch diagnosis/report for human review. If you introduce non-obvious state translation, index remapping, or backend split logic, add a short source comment that explains the invariant being preserved.
Start by explaining the likely root cause from the collected perf, strace, and /proc evidence. If you cannot land a safe patch, leave a diagnosis that is strong enough for an upstream bug report.
Interpreter process expectation: when the hot process is Python, Perl, shell, Node, Ruby, PHP, Lua, or another interpreter, inspect both the runtime and the script/application entrypoint from `details.interpreter_process`. Prefer the script or application package when evidence points there; do not patch the interpreter runtime merely because the hot binary is `python`, `perl`, `bash`, or similar. Runtime fixes are welcome only after checking the entrypoint and explaining why the runtime mishandles the workload or why running bad code faster/safer is itself the right upstream fix.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Keep the change narrowly scoped and summarize validation clearly.
In every authoring pass, your final response must start with `Subject: <single-line git commit subject>` and then include these markdown sections exactly:
## Commit Message
A short upstream-friendly explanation of what changed and why. Write it in plain language that a maintainer can follow without local complaint context. If you use subsystem jargon, define it immediately.
## Evidence Confidence
Exactly one word: `reproduced`, `observed`, or `inferred`. Use `reproduced` only when you reproduced the failure locally with a command or test, and include that command/test in `## Validation`. Use `observed` when Fixer has direct crash/log/trace evidence but you did not independently reproduce it. If `## Git Add Paths` lists source files for an `observed` patch, `## Issue Connection` must explicitly say the failure was observed by Fixer and not independently reproduced. Security-sensitive source changes touching authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior require reproduced evidence and explicit security-impact analysis; otherwise list `None` under `## Git Add Paths` and write a no-patch diagnosis/report. Use `inferred` for profiler/strace/indirect evidence; inferred responses may be no-patch diagnoses or reports, but inferred source patches are not pull-request-ready until stronger evidence is gathered.
## Issue Connection
Write this as maintainer-facing patch mail, not as local Fixer notes. Cover four things explicitly in readable sentences: the user-visible symptom or the exact collected signal, the code-level cause or the cautious inference from evidence, the specific change you made, and the expected effect. Do not invent a reproducer, command line, crash, or user-visible failure that is not present in the evidence bundle. If the evidence is direct-but-not-reproduced, say it was observed by Fixer and not independently reproduced. If the evidence is indirect and you did not gather stronger evidence, do not leave a source diff; write a no-patch diagnosis/report instead. Include an explicit effect sentence such as `The expected effect is ...`, `This should reduce ...`, or `This prevents ...` for source patches. If the logic is non-obvious in code, mention that you added a short explanatory comment.
## Git Add Paths
List the repo-relative paths that belong in the final patch, one per line. Use `None` only when you intentionally made no source changes. Include intentionally new files, and do not list generated build artifacts.
## Validation
List the checks you ran, or say clearly that you could not run them. Include the independent reproduction command/test and result when `## Evidence Confidence` is `reproduced`; if reproduction was attempted but blocked, name the exact blocker and keep confidence at `observed` or `inferred`.
Before editing, read the plan at `./plan-output.txt` and follow it unless the code proves part of it wrong. If you change course, say so explicitly in the final write-up instead of silently drifting from the plan.
## Review Pass 1
You are reviewing a freshly generated fixer patch.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Review the first patch pass. The original pre-edit snapshot is available at `./source` for diffing.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout. The latest author response is at `./patch-output.txt`. Inspect the current code and changed paths like a strict code reviewer. Focus on correctness, regressions, maintainability, awkward control flow such as avoidable `goto`, missing validation, weak or non-gittable commit message text, and explanations that fail to connect the observed issue evidence to the code change. Also review the maintainer experience: the patch mail should be easy to accept upstream, the user-visible bug should be explained in plain language, subsystem-specific jargon should be defined when first used, and any non-obvious state translation or index remapping in code should have a short explanatory comment. Reject patches that omit `## Evidence Confidence`, use anything other than `reproduced`, `observed`, or `inferred`, or sound more certain than that evidence level allows. Reject patches that claim `reproduced` unless `## Validation` names the concrete reproduction command or test and its result. Reject source patches in security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior unless the author reproduced the behavior and explicitly analyzed the security impact of the change; observed-only evidence should become a diagnosis/report, not a PR-ready source diff. Reject patches that invent a reproducer, command line, crash, or user-visible failure not present in the evidence bundle; indirect profiler or strace evidence may justify a cautious mitigation, but the author must say it is indirect instead of presenting it as a confirmed upstream bug. Reject patches that introduce generic libc/std APIs when nearby code or project docs provide a local compat/helper API for the same job, unless the author explicitly justifies the exception. Reject validation that only reports a leaf object/syntax build when a project-level configure/build/test entrypoint exists and was not attempted; if a full build cannot run, the author must show the exact failed command and blocker.
Do not apply code changes in this pass.
Return a short markdown review report. The first non-empty line must be exactly one of:
RESULT: ok
RESULT: fix-needed
If you choose `RESULT: fix-needed`, add a `## Findings` section with concrete, actionable items.## Plan Pass
## Problem
Fixer observed `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` in repeated `pselect6` calls. The retained strace shows 1.8-2.0 second blocking timeouts and process state `S (sleeping)`, with only ~0.9% CPU, so the bundle does not prove a tight application-level CPU loop.
## Evidence Confidence
inferred
## Proposed Subject
No source patch yet: diagnose the signal as likely idle `Net::Server::Fork` accept-loop polling unless an independent reproduction shows harmful CPU usage or a Munin-specific loop.
## Patch Plan
Do not edit in this pass. If later evidence proves a Munin bug, inspect `script/munin-node` and `lib/Munin/Node/Server.pm` first, because the entrypoint delegates to `Munin::Node::Server->run`.
Relevant local conventions found: `CONTRIBUTING.md` points to `HACKING.pod`; new Perl should use `strict`, `warnings`, taint-compatible style, `English qw(-no_match_vars)`, one statement per line, and local logging via `Munin::Common::Logger`. Relevant local helper found: request/plugin timeouts use `Munin::Common::Timeout::do_with_timeout`; daemon readiness uses `Munin::Common::Daemon::emit_sd_notify_message`. No Munin wrapper was found for the parent accept loop; that comes from `Net::Server::Fork`.
Current evidence maps cleanly to `Net::Server::Fork::accept`, which calls `can_read(2)` on the listening sockets. That produces periodic `select`/`pselect6` timeouts during normal idle operation, so a patch to add sleeps, gotos, or alternate control flow in Munin would be awkward and unjustified without more evidence. No prior Fixer patch was present to improve or replace; the workspace matches the original snapshot for the inspected files.
## Risks
Changing the accept loop without reproduction could reduce connection responsiveness, break signal/HUP handling inherited from `Net::Server::Fork`, or mask normal idle behavior as a bug fix. This area is not auth/crypto/permission-sensitive, but it is daemon timing behavior, so a source patch needs a reproducible impact measurement first.
## Validation
Before any focused check after a real patch, run project-level `make` from the workspace root, then `make check` only if a check target exists; otherwise use `make test`.
Bounded independent reproduction to collect before editing: start `script/munin-node --foreground` with a temporary config on a high localhost port and empty plugin dirs, attach `strace -ttT -f -e trace=pselect6,select,poll,ppoll`, and verify whether idle behavior is just 2-second blocking `pselect6` calls with low CPU. Focused fallback checks would be `perl -Ilib -c script/munin-node` and `perl -Ilib -c lib/Munin/Node/Server.pm`.
## Patch Pass
Subject: Diagnose idle munin-node select evidence
## Commit Message
No source change. The collected signal is better explained as `munin-node` sleeping in the `Net::Server::Fork` accept loop, which is the loop that waits for incoming client connections, than as a proven Munin CPU bug.
## Evidence Confidence
inferred
## Issue Connection
Fixer observed `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` repeatedly in `pselect6`, with a native stack under Perl and `select()`. The same bundle also shows `pselect6` calls blocking for about 1.8-2.0 seconds, process state `S (sleeping)`, wait channel `poll_schedule_timeout`, and only about 0.9% CPU.
The likely root cause is a false-positive “busy poll” classification of normal idle server waiting. `script/munin-node` delegates to `Munin::Node::Server`, which subclasses `Net::Server::Fork`; that parent server uses a 2-second readable-socket wait in its accept loop. I did not patch Perl itself, because the interpreter evidence points to the Munin script entrypoint first and does not show a runtime bug.
No code change was made. This follows the saved plan: the evidence is profiler/strace/proc evidence without a Perl-level stack or local reproduction of harmful CPU use, and changing daemon timing behavior without reproduced impact would be unsafe. The expected effect is no repository diff; this should be handled as an upstream diagnosis unless stronger evidence shows actual CPU runaway or a Munin-specific loop.
Project conventions checked: `CONTRIBUTING.md` points to `HACKING.pod`; relevant local helpers include `Munin::Common::Timeout::do_with_timeout`, `Munin::Common::Daemon::emit_sd_notify_message`, and `Munin::Common::Logger`. No Munin helper wraps the parent `Net::Server::Fork` accept loop.
## Git Add Paths
None
## Validation
`make` from the workspace root failed before tests because `Module::Build` is missing:
`Can't locate Module/Build.pm in @INC ... at Build.PL line 80.`
`make -n check` failed because there is no `check` target:
`make: *** No rule to make target 'check'. Stop.`
Focused checks:
`perl -Ilib -c lib/Munin/Node/Server.pm` passed.
`perl -T -Ilib -c script/munin-node` passed.
Independent reproduction attempt:
Tried to run workspace `script/munin-node --foreground` with a temporary config on `127.0.0.1:24949` and attach `strace`, but the sandbox blocked listening sockets: `Cannot bind and listen to TCP port 24949 on 127.0.0.1 [Operation not permitted]`. Confidence remains `inferred`; no source patch was left.
## Review Pass 1
RESULT: ok
No source diff is present, and the author correctly treated the profiler/strace evidence as indirect rather than leaving a speculative timing/daemon-loop patch. The response includes the required evidence confidence, keeps it at `inferred`, explains the likely `Net::Server::Fork` idle accept-loop cause, lists `None` for git paths, and reports project-level validation blockers before focused syntax checks.perl likely remains stuck in a busy-poll loop. A diagnosis report and patch proposal were created locally.
## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.
## Patch Pass
You are working on a bounded fixer proposal.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Produce the smallest reasonable patch for the target repository, keep the change upstreamable, prefer the clearest control flow available, and do not keep avoidable `goto` when a simpler structure would read better. Before introducing new file, process, allocation, locking, networking, or platform APIs, inspect nearby code and project contribution docs for existing helpers or compatibility wrappers and use those local patterns unless you can explain why they do not fit. Validate from a reproducible workspace-root entrypoint before falling back to focused leaf commands; if a build or test cannot run, report the exact command, the exact blocker, and any narrower check you ran instead. During validation, also try one bounded independent reproduction of the collected failure signal when it is safe and cheap, such as a failing test, smoke command, perf/strace comparison, or before/after runtime check. Only use `reproduced` if that command or test actually reproduced the failure; otherwise keep `observed` and report the reproduction blocker. The final explanation must connect the observed issue evidence to the actual code change, not just paraphrase the diff. Write like a maintainer is going to read the patch mail cold: explain the bug in plain language, define subsystem-specific jargon the first time you need it, and make the causal story obvious. Explicitly classify evidence confidence as `reproduced`, `observed`, or `inferred`: `reproduced` means you reproduced the failure locally; `observed` means Fixer has direct crash/log/trace evidence but you did not independently reproduce it; `inferred` means the source patch is not pull-request-ready, so do not leave a source diff unless you first gather stronger observed/reproduced evidence; otherwise return a no-patch diagnosis/report. For any source-changing `observed` patch, say explicitly in `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. Security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior need reproduced evidence plus explicit security-impact analysis before leaving a source diff; otherwise return a no-patch diagnosis/report for human review. If you introduce non-obvious state translation, index remapping, or backend split logic, add a short source comment that explains the invariant being preserved.
Start by explaining the likely root cause from the collected perf, strace, and /proc evidence. If you cannot land a safe patch, leave a diagnosis that is strong enough for an upstream bug report.
Interpreter process expectation: when the hot process is Python, Perl, shell, Node, Ruby, PHP, Lua, or another interpreter, inspect both the runtime and the script/application entrypoint from `details.interpreter_process`. Prefer the script or application package when evidence points there; do not patch the interpreter runtime merely because the hot binary is `python`, `perl`, `bash`, or similar. Runtime fixes are welcome only after checking the entrypoint and explaining why the runtime mishandles the workload or why running bad code faster/safer is itself the right upstream fix.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Keep the change narrowly scoped and summarize validation clearly.
In every authoring pass, your final response must start with `Subject: <single-line git commit subject>` and then include these markdown sections exactly:
## Commit Message
A short upstream-friendly explanation of what changed and why. Write it in plain language that a maintainer can follow without local complaint context. If you use subsystem jargon, define it immediately.
## Evidence Confidence
Exactly one word: `reproduced`, `observed`, or `inferred`. Use `reproduced` only when you reproduced the failure locally with a command or test, and include that command/test in `## Validation`. Use `observed` when Fixer has direct crash/log/trace evidence but you did not independently reproduce it. If `## Git Add Paths` lists source files for an `observed` patch, `## Issue Connection` must explicitly say the failure was observed by Fixer and not independently reproduced. Security-sensitive source changes touching authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior require reproduced evidence and explicit security-impact analysis; otherwise list `None` under `## Git Add Paths` and write a no-patch diagnosis/report. Use `inferred` for profiler/strace/indirect evidence; inferred responses may be no-patch diagnoses or reports, but inferred source patches are not pull-request-ready until stronger evidence is gathered.
## Issue Connection
Write this as maintainer-facing patch mail, not as local Fixer notes. Cover four things explicitly in readable sentences: the user-visible symptom or the exact collected signal, the code-level cause or the cautious inference from evidence, the specific change you made, and the expected effect. Do not invent a reproducer, command line, crash, or user-visible failure that is not present in the evidence bundle. If the evidence is direct-but-not-reproduced, say it was observed by Fixer and not independently reproduced. If the evidence is indirect and you did not gather stronger evidence, do not leave a source diff; write a no-patch diagnosis/report instead. Include an explicit effect sentence such as `The expected effect is ...`, `This should reduce ...`, or `This prevents ...` for source patches. If the logic is non-obvious in code, mention that you added a short explanatory comment.
## Git Add Paths
List the repo-relative paths that belong in the final patch, one per line. Use `None` only when you intentionally made no source changes. Include intentionally new files, and do not list generated build artifacts.
## Validation
List the checks you ran, or say clearly that you could not run them. Include the independent reproduction command/test and result when `## Evidence Confidence` is `reproduced`; if reproduction was attempted but blocked, name the exact blocker and keep confidence at `observed` or `inferred`.
Before editing, read the plan at `./plan-output.txt` and follow it unless the code proves part of it wrong. If you change course, say so explicitly in the final write-up instead of silently drifting from the plan.
## Review Pass 1
You are reviewing a freshly generated fixer patch.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Review the first patch pass. The original pre-edit snapshot is available at `./source` for diffing.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout. The latest author response is at `./patch-output.txt`. Inspect the current code and changed paths like a strict code reviewer. Focus on correctness, regressions, maintainability, awkward control flow such as avoidable `goto`, missing validation, weak or non-gittable commit message text, and explanations that fail to connect the observed issue evidence to the code change. Also review the maintainer experience: the patch mail should be easy to accept upstream, the user-visible bug should be explained in plain language, subsystem-specific jargon should be defined when first used, and any non-obvious state translation or index remapping in code should have a short explanatory comment. Reject patches that omit `## Evidence Confidence`, use anything other than `reproduced`, `observed`, or `inferred`, or sound more certain than that evidence level allows. Reject patches that claim `reproduced` unless `## Validation` names the concrete reproduction command or test and its result. Reject source patches in security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior unless the author reproduced the behavior and explicitly analyzed the security impact of the change; observed-only evidence should become a diagnosis/report, not a PR-ready source diff. Reject patches that invent a reproducer, command line, crash, or user-visible failure not present in the evidence bundle; indirect profiler or strace evidence may justify a cautious mitigation, but the author must say it is indirect instead of presenting it as a confirmed upstream bug. Reject patches that introduce generic libc/std APIs when nearby code or project docs provide a local compat/helper API for the same job, unless the author explicitly justifies the exception. Reject validation that only reports a leaf object/syntax build when a project-level configure/build/test entrypoint exists and was not attempted; if a full build cannot run, the author must show the exact failed command and blocker.
Do not apply code changes in this pass.
Return a short markdown review report. The first non-empty line must be exactly one of:
RESULT: ok
RESULT: fix-needed
If you choose `RESULT: fix-needed`, add a `## Findings` section with concrete, actionable items.## Plan Pass
## Problem
Fixer observed `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` in a poll-family syscall path, but the retained evidence shows `munin-node` sleeping in `pselect6` with roughly 2-second timeouts and only about `0.9%` CPU. No Perl-level stack ties the samples to a Munin source line, and `Munin::Node::Server` delegates the listener loop to `Net::Server::Fork`.
## Evidence Confidence
inferred
## Proposed Subject
No source patch yet: diagnose the collected signal as insufficient for an upstream Munin fix until a bounded reproduction or Perl-level stack shows an application-level busy loop.
## Patch Plan
- Do not edit Munin source in this pass. A source patch would be speculative because the evidence bundle does not prove a tight loop in `script/munin-node`, `lib/Munin/Node/Server.pm`, or plugin execution.
- Treat the entrypoint first, per evidence: `script/munin-node` configures services, foreground mode, and calls `Munin::Node::Server->run`; the relevant local conventions are `Munin::Common::Daemon::emit_sd_notify_message`, `Munin::Common::Logger`, `Munin::Common::Timeout::do_with_timeout`, and existing `Net::Server` hooks.
- If later evidence identifies a Munin-owned loop, patch the narrow owning function using the file’s current Perl style: `strict`/`warnings`, `English`, one statement per line, no avoidable `goto`, and existing logging/timeout helpers rather than ad hoc IO or process handling.
- No prior Fixer patch was found. Existing Debian quilt patches are unrelated packaging patches, so an upstream-style patch should not build on or replace them.
## Risks
- Adding sleeps, throttles, or altered accept-loop behavior without reproduction could regress normal daemon responsiveness or mask a `Net::Server`/runtime/kernel observation.
- This touches daemon timing if patched later, so validation must reproduce the behavior and explain the operational impact before proposing any source change.
- The current evidence may simply show normal idle `munin-node` behavior: a sleeping process waiting for connections.
## Validation
- First try the project entrypoint from the workspace root: `make`, then `make test`. `make check` is not present as a Makefile target.
- If project-level validation fails due to missing dependencies or generated files, record the exact command and failure reason, then run the narrowest reproducible check such as `perl -c script/munin-node` and `perl -c lib/Munin/Node/Server.pm` after any required build generation.
- Bounded independent reproduction attempt before any source patch: run `munin-node --foreground` through the project’s taint-safe helper from `HACKING.pod` where possible, attach `strace -ttT -f -e trace=pselect6,select,poll,ppoll`, and confirm whether it spins with near-zero timeout/high CPU or merely blocks in normal timed `pselect6`.
## Patch Pass
Subject: Diagnose munin-node idle pselect evidence as insufficient
## Commit Message
No source change is proposed. The collected evidence points to an idle `munin-node` process blocked in the server wait loop, not to a proven Munin-owned busy loop. The safe upstream action is to request a Perl-level stack or reproducible trace before changing daemon timing behavior.
## Evidence Confidence
inferred
## Issue Connection
Fixer collected perf, strace, and `/proc` evidence for `/usr/bin/perl -wT /usr/sbin/munin-node --foreground`. The signal was classified as a likely poll loop, but the concrete trace shows `pselect6` calls blocking for about 1.8 to 2.0 seconds, `/proc` reports `State: S (sleeping)`, and the sampled process CPU was about `0.9%`.
I inspected the Perl application entrypoint before considering the Perl runtime. `script/munin-node` parses configuration, constructs `Munin::Node::Service`, and then delegates the listener loop to `Munin::Node::Server->run`, which inherits from `Net::Server::Fork`. The relevant local helpers and conventions are `Munin::Common::Daemon::emit_sd_notify_message`, `Munin::Common::Logger`, `Munin::Common::Timeout::do_with_timeout`, and `Munin::Node::OS` for child process handling. No Munin-owned tight loop was identified in the entrypoint or nearby server code.
Because the evidence is profiler/trace-derived and does not include a Perl-level stack, minimal reproducer, high local CPU observation, or near-zero timeout spin, I left no source diff. Changing the accept loop, adding sleeps, or altering timeout behavior would be a speculative timing/throttling change without reproduced evidence. This follows the saved plan; I did not change course.
## Git Add Paths
None
## Validation
`make` failed from the workspace root before building:
`Can't locate Module/Build.pm in @INC ... at Build.PL line 80`, followed by `make: *** [Makefile:149: Build] Error 2`.
`make test` failed with the same blocker:
`Can't locate Module/Build.pm in @INC ... at Build.PL line 80`, followed by `make: *** [Makefile:149: Build] Error 2`.
`make check` is not available as a target in this tree.
Focused checks run after the project-level blocker:
`perl -Ilib -c lib/Munin/Node/Server.pm` passed.
`perl -Ilib -c lib/Munin/Node/OS.pm` passed with existing subroutine redefinition warnings.
`perl -T -Ilib -c script/munin-node` passed; note that the checkout lacks generated `lib/Munin/Common/Defaults.pm`, so this check used the system-installed Munin defaults module.
Independent reproduction attempts did not reproduce the failure. `strace -ttT -f -e trace=pselect6,select,poll,ppoll ...` was blocked by sandbox ptrace restrictions: `PTRACE_TRACEME: Operation not permitted` and `ptrace(PTRACE_SEIZE, 7): Operation not permitted`. Running the exact evidence command failed because `/usr/sbin/munin-node` is absent in this workspace. A closest source-tree foreground startup exited before sampling and produced no poll-loop or high-CPU observation.
## Review Pass 1
RESULT: ok
The first patch pass leaves the workspace clean and correctly returns a no-patch diagnosis for indirect profiler/strace evidence. `## Evidence Confidence` is present and set to `inferred`, which matches the lack of a local reproduction and the absence of a Perl-level stack tying the signal to Munin code.
The maintainer-facing explanation is cautious enough: it connects the observed `pselect6` samples, sleeping process state, and low CPU to the decision not to change `munin-node` timing behavior. It also names the relevant local helpers and conventions (`Munin::Common::Daemon`, `Munin::Common::Logger`, `Munin::Common::Timeout`, `Munin::Node::OS`) and does not invent a confirmed upstream bug.
Validation attempted the project-level entrypoints (`make`, `make test`), documented the missing `Module::Build` blocker, and then used narrower syntax checks plus bounded reproduction attempts. No source files are listed for git add, and `git diff` is empty.perl likely remains stuck in a busy-poll loop. A diagnosis report and patch proposal were created locally.
## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.
## Patch Pass
You are working on a bounded fixer proposal.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Produce the smallest reasonable patch for the target repository, keep the change upstreamable, prefer the clearest control flow available, and do not keep avoidable `goto` when a simpler structure would read better. Before introducing new file, process, allocation, locking, networking, or platform APIs, inspect nearby code and project contribution docs for existing helpers or compatibility wrappers and use those local patterns unless you can explain why they do not fit. Validate from a reproducible workspace-root entrypoint before falling back to focused leaf commands; if a build or test cannot run, report the exact command, the exact blocker, and any narrower check you ran instead. During validation, also try one bounded independent reproduction of the collected failure signal when it is safe and cheap, such as a failing test, smoke command, perf/strace comparison, or before/after runtime check. Only use `reproduced` if that command or test actually reproduced the failure; otherwise keep `observed` and report the reproduction blocker. The final explanation must connect the observed issue evidence to the actual code change, not just paraphrase the diff. Write like a maintainer is going to read the patch mail cold: explain the bug in plain language, define subsystem-specific jargon the first time you need it, and make the causal story obvious. Explicitly classify evidence confidence as `reproduced`, `observed`, or `inferred`: `reproduced` means you reproduced the failure locally; `observed` means Fixer has direct crash/log/trace evidence but you did not independently reproduce it; `inferred` means the source patch is not pull-request-ready, so do not leave a source diff unless you first gather stronger observed/reproduced evidence; otherwise return a no-patch diagnosis/report. For any source-changing `observed` patch, say explicitly in `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. Security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior need reproduced evidence plus explicit security-impact analysis before leaving a source diff; otherwise return a no-patch diagnosis/report for human review. If you introduce non-obvious state translation, index remapping, or backend split logic, add a short source comment that explains the invariant being preserved.
Start by explaining the likely root cause from the collected perf, strace, and /proc evidence. If you cannot land a safe patch, leave a diagnosis that is strong enough for an upstream bug report.
Interpreter process expectation: when the hot process is Python, Perl, shell, Node, Ruby, PHP, Lua, or another interpreter, inspect both the runtime and the script/application entrypoint from `details.interpreter_process`. Prefer the script or application package when evidence points there; do not patch the interpreter runtime merely because the hot binary is `python`, `perl`, `bash`, or similar. Runtime fixes are welcome only after checking the entrypoint and explaining why the runtime mishandles the workload or why running bad code faster/safer is itself the right upstream fix.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Keep the change narrowly scoped and summarize validation clearly.
In every authoring pass, your final response must start with `Subject: <single-line git commit subject>` and then include these markdown sections exactly:
## Commit Message
A short upstream-friendly explanation of what changed and why. Write it in plain language that a maintainer can follow without local complaint context. If you use subsystem jargon, define it immediately.
## Evidence Confidence
Exactly one word: `reproduced`, `observed`, or `inferred`. Use `reproduced` only when you reproduced the failure locally with a command or test, and include that command/test in `## Validation`. Use `observed` when Fixer has direct crash/log/trace evidence but you did not independently reproduce it. If `## Git Add Paths` lists source files for an `observed` patch, `## Issue Connection` must explicitly say the failure was observed by Fixer and not independently reproduced. Security-sensitive source changes touching authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior require reproduced evidence and explicit security-impact analysis; otherwise list `None` under `## Git Add Paths` and write a no-patch diagnosis/report. Use `inferred` for profiler/strace/indirect evidence; inferred responses may be no-patch diagnoses or reports, but inferred source patches are not pull-request-ready until stronger evidence is gathered.
## Issue Connection
Write this as maintainer-facing patch mail, not as local Fixer notes. Cover four things explicitly in readable sentences: the user-visible symptom or the exact collected signal, the code-level cause or the cautious inference from evidence, the specific change you made, and the expected effect. Do not invent a reproducer, command line, crash, or user-visible failure that is not present in the evidence bundle. If the evidence is direct-but-not-reproduced, say it was observed by Fixer and not independently reproduced. If the evidence is indirect and you did not gather stronger evidence, do not leave a source diff; write a no-patch diagnosis/report instead. Include an explicit effect sentence such as `The expected effect is ...`, `This should reduce ...`, or `This prevents ...` for source patches. If the logic is non-obvious in code, mention that you added a short explanatory comment.
## Git Add Paths
List the repo-relative paths that belong in the final patch, one per line. Use `None` only when you intentionally made no source changes. Include intentionally new files, and do not list generated build artifacts.
## Validation
List the checks you ran, or say clearly that you could not run them. Include the independent reproduction command/test and result when `## Evidence Confidence` is `reproduced`; if reproduction was attempted but blocked, name the exact blocker and keep confidence at `observed` or `inferred`.
Before editing, read the plan at `./plan-output.txt` and follow it unless the code proves part of it wrong. If you change course, say so explicitly in the final write-up instead of silently drifting from the plan.
## Review Pass 1
You are reviewing a freshly generated fixer patch.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Review the first patch pass. The original pre-edit snapshot is available at `./source` for diffing.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout. The latest author response is at `./patch-output.txt`. Inspect the current code and changed paths like a strict code reviewer. Focus on correctness, regressions, maintainability, awkward control flow such as avoidable `goto`, missing validation, weak or non-gittable commit message text, and explanations that fail to connect the observed issue evidence to the code change. Also review the maintainer experience: the patch mail should be easy to accept upstream, the user-visible bug should be explained in plain language, subsystem-specific jargon should be defined when first used, and any non-obvious state translation or index remapping in code should have a short explanatory comment. Reject patches that omit `## Evidence Confidence`, use anything other than `reproduced`, `observed`, or `inferred`, or sound more certain than that evidence level allows. Reject patches that claim `reproduced` unless `## Validation` names the concrete reproduction command or test and its result. Reject source patches in security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior unless the author reproduced the behavior and explicitly analyzed the security impact of the change; observed-only evidence should become a diagnosis/report, not a PR-ready source diff. Reject patches that invent a reproducer, command line, crash, or user-visible failure not present in the evidence bundle; indirect profiler or strace evidence may justify a cautious mitigation, but the author must say it is indirect instead of presenting it as a confirmed upstream bug. Reject patches that introduce generic libc/std APIs when nearby code or project docs provide a local compat/helper API for the same job, unless the author explicitly justifies the exception. Reject validation that only reports a leaf object/syntax build when a project-level configure/build/test entrypoint exists and was not attempted; if a full build cannot run, the author must show the exact failed command and blocker.
Do not apply code changes in this pass.
Return a short markdown review report. The first non-empty line must be exactly one of:
RESULT: ok
RESULT: fix-needed
If you choose `RESULT: fix-needed`, add a `## Findings` section with concrete, actionable items.## Plan Pass
## Problem
Fixer observed `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` in a poll-family syscall path, but the retained evidence shows `munin-node` sleeping in `pselect6` with roughly 2-second timeouts and only about `0.9%` CPU. No Perl-level stack ties the samples to a Munin source line, and `Munin::Node::Server` delegates the listener loop to `Net::Server::Fork`.
## Evidence Confidence
inferred
## Proposed Subject
No source patch yet: diagnose the collected signal as insufficient for an upstream Munin fix until a bounded reproduction or Perl-level stack shows an application-level busy loop.
## Patch Plan
- Do not edit Munin source in this pass. A source patch would be speculative because the evidence bundle does not prove a tight loop in `script/munin-node`, `lib/Munin/Node/Server.pm`, or plugin execution.
- Treat the entrypoint first, per evidence: `script/munin-node` configures services, foreground mode, and calls `Munin::Node::Server->run`; the relevant local conventions are `Munin::Common::Daemon::emit_sd_notify_message`, `Munin::Common::Logger`, `Munin::Common::Timeout::do_with_timeout`, and existing `Net::Server` hooks.
- If later evidence identifies a Munin-owned loop, patch the narrow owning function using the file’s current Perl style: `strict`/`warnings`, `English`, one statement per line, no avoidable `goto`, and existing logging/timeout helpers rather than ad hoc IO or process handling.
- No prior Fixer patch was found. Existing Debian quilt patches are unrelated packaging patches, so an upstream-style patch should not build on or replace them.
## Risks
- Adding sleeps, throttles, or altered accept-loop behavior without reproduction could regress normal daemon responsiveness or mask a `Net::Server`/runtime/kernel observation.
- This touches daemon timing if patched later, so validation must reproduce the behavior and explain the operational impact before proposing any source change.
- The current evidence may simply show normal idle `munin-node` behavior: a sleeping process waiting for connections.
## Validation
- First try the project entrypoint from the workspace root: `make`, then `make test`. `make check` is not present as a Makefile target.
- If project-level validation fails due to missing dependencies or generated files, record the exact command and failure reason, then run the narrowest reproducible check such as `perl -c script/munin-node` and `perl -c lib/Munin/Node/Server.pm` after any required build generation.
- Bounded independent reproduction attempt before any source patch: run `munin-node --foreground` through the project’s taint-safe helper from `HACKING.pod` where possible, attach `strace -ttT -f -e trace=pselect6,select,poll,ppoll`, and confirm whether it spins with near-zero timeout/high CPU or merely blocks in normal timed `pselect6`.
## Patch Pass
Subject: Diagnose munin-node idle pselect evidence as insufficient
## Commit Message
No source change is proposed. The collected evidence points to an idle `munin-node` process blocked in the server wait loop, not to a proven Munin-owned busy loop. The safe upstream action is to request a Perl-level stack or reproducible trace before changing daemon timing behavior.
## Evidence Confidence
inferred
## Issue Connection
Fixer collected perf, strace, and `/proc` evidence for `/usr/bin/perl -wT /usr/sbin/munin-node --foreground`. The signal was classified as a likely poll loop, but the concrete trace shows `pselect6` calls blocking for about 1.8 to 2.0 seconds, `/proc` reports `State: S (sleeping)`, and the sampled process CPU was about `0.9%`.
I inspected the Perl application entrypoint before considering the Perl runtime. `script/munin-node` parses configuration, constructs `Munin::Node::Service`, and then delegates the listener loop to `Munin::Node::Server->run`, which inherits from `Net::Server::Fork`. The relevant local helpers and conventions are `Munin::Common::Daemon::emit_sd_notify_message`, `Munin::Common::Logger`, `Munin::Common::Timeout::do_with_timeout`, and `Munin::Node::OS` for child process handling. No Munin-owned tight loop was identified in the entrypoint or nearby server code.
Because the evidence is profiler/trace-derived and does not include a Perl-level stack, minimal reproducer, high local CPU observation, or near-zero timeout spin, I left no source diff. Changing the accept loop, adding sleeps, or altering timeout behavior would be a speculative timing/throttling change without reproduced evidence. This follows the saved plan; I did not change course.
## Git Add Paths
None
## Validation
`make` failed from the workspace root before building:
`Can't locate Module/Build.pm in @INC ... at Build.PL line 80`, followed by `make: *** [Makefile:149: Build] Error 2`.
`make test` failed with the same blocker:
`Can't locate Module/Build.pm in @INC ... at Build.PL line 80`, followed by `make: *** [Makefile:149: Build] Error 2`.
`make check` is not available as a target in this tree.
Focused checks run after the project-level blocker:
`perl -Ilib -c lib/Munin/Node/Server.pm` passed.
`perl -Ilib -c lib/Munin/Node/OS.pm` passed with existing subroutine redefinition warnings.
`perl -T -Ilib -c script/munin-node` passed; note that the checkout lacks generated `lib/Munin/Common/Defaults.pm`, so this check used the system-installed Munin defaults module.
Independent reproduction attempts did not reproduce the failure. `strace -ttT -f -e trace=pselect6,select,poll,ppoll ...` was blocked by sandbox ptrace restrictions: `PTRACE_TRACEME: Operation not permitted` and `ptrace(PTRACE_SEIZE, 7): Operation not permitted`. Running the exact evidence command failed because `/usr/sbin/munin-node` is absent in this workspace. A closest source-tree foreground startup exited before sampling and produced no poll-loop or high-CPU observation.
## Review Pass 1
RESULT: ok
The first patch pass leaves the workspace clean and correctly returns a no-patch diagnosis for indirect profiler/strace evidence. `## Evidence Confidence` is present and set to `inferred`, which matches the lack of a local reproduction and the absence of a Perl-level stack tying the signal to Munin code.
The maintainer-facing explanation is cautious enough: it connects the observed `pselect6` samples, sleeping process state, and low CPU to the decision not to change `munin-node` timing behavior. It also names the relevant local helpers and conventions (`Munin::Common::Daemon`, `Munin::Common::Logger`, `Munin::Common::Timeout`, `Munin::Node::OS`) and does not invent a confirmed upstream bug.
Validation attempted the project-level entrypoints (`make`, `make test`), documented the missing `Module::Build` blocker, and then used narrower syntax checks plus bounded reproduction attempts. No source files are listed for git add, and `git diff` is empty.perl likely remains stuck in a busy-poll loop. A diagnosis report and patch proposal were created locally.
## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.
## Patch Pass
You are working on a bounded fixer proposal.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Produce the smallest reasonable patch for the target repository, keep the change upstreamable, prefer the clearest control flow available, and do not keep avoidable `goto` when a simpler structure would read better. Before introducing new file, process, allocation, locking, networking, or platform APIs, inspect nearby code and project contribution docs for existing helpers or compatibility wrappers and use those local patterns unless you can explain why they do not fit. Validate from a reproducible workspace-root entrypoint before falling back to focused leaf commands; if a build or test cannot run, report the exact command, the exact blocker, and any narrower check you ran instead. During validation, also try one bounded independent reproduction of the collected failure signal when it is safe and cheap, such as a failing test, smoke command, perf/strace comparison, or before/after runtime check. Only use `reproduced` if that command or test actually reproduced the failure; otherwise keep `observed` and report the reproduction blocker. The final explanation must connect the observed issue evidence to the actual code change, not just paraphrase the diff. Write like a maintainer is going to read the patch mail cold: explain the bug in plain language, define subsystem-specific jargon the first time you need it, and make the causal story obvious. Explicitly classify evidence confidence as `reproduced`, `observed`, or `inferred`: `reproduced` means you reproduced the failure locally; `observed` means Fixer has direct crash/log/trace evidence but you did not independently reproduce it; `inferred` means the source patch is not pull-request-ready, so do not leave a source diff unless you first gather stronger observed/reproduced evidence; otherwise return a no-patch diagnosis/report. For any source-changing `observed` patch, say explicitly in `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. Security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior need reproduced evidence plus explicit security-impact analysis before leaving a source diff; otherwise return a no-patch diagnosis/report for human review. If you introduce non-obvious state translation, index remapping, or backend split logic, add a short source comment that explains the invariant being preserved.
Start by explaining the likely root cause from the collected perf, strace, and /proc evidence. If you cannot land a safe patch, leave a diagnosis that is strong enough for an upstream bug report.
Interpreter process expectation: when the hot process is Python, Perl, shell, Node, Ruby, PHP, Lua, or another interpreter, inspect both the runtime and the script/application entrypoint from `details.interpreter_process`. Prefer the script or application package when evidence points there; do not patch the interpreter runtime merely because the hot binary is `python`, `perl`, `bash`, or similar. Runtime fixes are welcome only after checking the entrypoint and explaining why the runtime mishandles the workload or why running bad code faster/safer is itself the right upstream fix.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Keep the change narrowly scoped and summarize validation clearly.
In every authoring pass, your final response must start with `Subject: <single-line git commit subject>` and then include these markdown sections exactly:
## Commit Message
A short upstream-friendly explanation of what changed and why. Write it in plain language that a maintainer can follow without local complaint context. If you use subsystem jargon, define it immediately.
## Evidence Confidence
Exactly one word: `reproduced`, `observed`, or `inferred`. Use `reproduced` only when you reproduced the failure locally with a command or test, and include that command/test in `## Validation`. Use `observed` when Fixer has direct crash/log/trace evidence but you did not independently reproduce it. If `## Git Add Paths` lists source files for an `observed` patch, `## Issue Connection` must explicitly say the failure was observed by Fixer and not independently reproduced. Security-sensitive source changes touching authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior require reproduced evidence and explicit security-impact analysis; otherwise list `None` under `## Git Add Paths` and write a no-patch diagnosis/report. Use `inferred` for profiler/strace/indirect evidence; inferred responses may be no-patch diagnoses or reports, but inferred source patches are not pull-request-ready until stronger evidence is gathered.
## Issue Connection
Write this as maintainer-facing patch mail, not as local Fixer notes. Cover four things explicitly in readable sentences: the user-visible symptom or the exact collected signal, the code-level cause or the cautious inference from evidence, the specific change you made, and the expected effect. Do not invent a reproducer, command line, crash, or user-visible failure that is not present in the evidence bundle. If the evidence is direct-but-not-reproduced, say it was observed by Fixer and not independently reproduced. If the evidence is indirect and you did not gather stronger evidence, do not leave a source diff; write a no-patch diagnosis/report instead. Include an explicit effect sentence such as `The expected effect is ...`, `This should reduce ...`, or `This prevents ...` for source patches. If the logic is non-obvious in code, mention that you added a short explanatory comment.
## Git Add Paths
List the repo-relative paths that belong in the final patch, one per line. Use `None` only when you intentionally made no source changes. Include intentionally new files, and do not list generated build artifacts.
## Validation
List the checks you ran, or say clearly that you could not run them. Include the independent reproduction command/test and result when `## Evidence Confidence` is `reproduced`; if reproduction was attempted but blocked, name the exact blocker and keep confidence at `observed` or `inferred`.
Before editing, read the plan at `./plan-output.txt` and follow it unless the code proves part of it wrong. If you change course, say so explicitly in the final write-up instead of silently drifting from the plan.
## Review Pass 1
You are reviewing a freshly generated fixer patch.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Review the first patch pass. The original pre-edit snapshot is available at `./source` for diffing.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout. The latest author response is at `./patch-output.txt`. Inspect the current code and changed paths like a strict code reviewer. Focus on correctness, regressions, maintainability, awkward control flow such as avoidable `goto`, missing validation, weak or non-gittable commit message text, and explanations that fail to connect the observed issue evidence to the code change. Also review the maintainer experience: the patch mail should be easy to accept upstream, the user-visible bug should be explained in plain language, subsystem-specific jargon should be defined when first used, and any non-obvious state translation or index remapping in code should have a short explanatory comment. Reject patches that omit `## Evidence Confidence`, use anything other than `reproduced`, `observed`, or `inferred`, or sound more certain than that evidence level allows. Reject patches that claim `reproduced` unless `## Validation` names the concrete reproduction command or test and its result. Reject source patches in security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior unless the author reproduced the behavior and explicitly analyzed the security impact of the change; observed-only evidence should become a diagnosis/report, not a PR-ready source diff. Reject patches that invent a reproducer, command line, crash, or user-visible failure not present in the evidence bundle; indirect profiler or strace evidence may justify a cautious mitigation, but the author must say it is indirect instead of presenting it as a confirmed upstream bug. Reject patches that introduce generic libc/std APIs when nearby code or project docs provide a local compat/helper API for the same job, unless the author explicitly justifies the exception. Reject validation that only reports a leaf object/syntax build when a project-level configure/build/test entrypoint exists and was not attempted; if a full build cannot run, the author must show the exact failed command and blocker.
Do not apply code changes in this pass.
Return a short markdown review report. The first non-empty line must be exactly one of:
RESULT: ok
RESULT: fix-needed
If you choose `RESULT: fix-needed`, add a `## Findings` section with concrete, actionable items.## Plan Pass
## Problem
Fixer observed `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` in a repeated `pselect6` path, but the retained evidence does not show a Perl-level stack or a tight application loop. The strace excerpt shows blocking `pselect6` calls of about 1.8-2.0 seconds, process state `S (sleeping)`, and max CPU around 0.9%, so this looks more like normal daemon wait behavior than a confirmed runaway CPU bug.
## Evidence Confidence
observed
## Proposed Subject
No upstream source patch yet: diagnose the Fixer signal as insufficient for a pull-request-ready Munin change unless a bounded reproduction can show short/zero-timeout polling or unexpected wakeups in `munin-node`.
## Patch Plan
Do not edit in this pass. The evidence is profiler-only and points at a Perl script entrypoint, so the investigation should stay in Munin first, not Perl runtime.
Relevant code paths inspected: `script/munin-node`, `lib/Munin/Node/Server.pm`, `lib/Munin/Node/OS.pm`, and `lib/Munin/Common/Timeout.pm`. Local conventions/helpers to follow if later evidence supports a patch: `Munin::Common::Timeout::do_with_timeout` for bounded work, `Munin::Common::Logger` for logging, Net::Server callbacks for daemon behavior, `strict`/`warnings`, `English qw(-no_match_vars)`, and existing file indentation. No local wrapper was found for Net::Server’s accept-loop polling itself.
A timing/select-timeout source patch is blocked for now because it would change daemon timing behavior without a reproduced failure, and the observed `pselect6` calls are sleeping for seconds rather than spinning. No prior Fixer patch for this issue was found; existing Debian patches are unrelated.
## Risks
Changing timeout or select behavior speculatively could affect signal responsiveness, daemon shutdown/reload timing, connection acceptance, or plugin timeout handling. It could also hide a false-positive profiler signal instead of fixing a real Munin bug.
## Validation
For any later patch, first try project-level validation from the workspace root: `make`. There is no visible `make check` target in `Makefile`; use `make test` as the project test entrypoint after `make`.
Bounded independent reproduction before editing: run `munin-node --foreground` from a built tree with a test/sandbox config under `timeout`, trace `pselect6/select/poll`, and confirm whether waits are near-zero or multi-second. Only proceed with a source patch if that command shows an actual busy poll tied to Munin code; otherwise report this as observed-but-not-reproduced profiler evidence.
## Patch Pass
Subject: Diagnose munin-node poll profile as idle wait
## Commit Message
No source change. The collected perf, strace, and `/proc` data most likely shows `munin-node` sleeping in its daemon wait loop, not spinning. A timing patch would be speculative and would touch daemon wait behavior without a reproduced busy-poll failure.
## Evidence Confidence
inferred
## Issue Connection
Fixer collected a Perl process running `munin-node --foreground` with native frames under `select()`/`pselect6`. The same bundle shows only three `pselect6` calls over five seconds, each blocking for about 1.8-2.0 seconds, with process state `S (sleeping)`, `wchan` at `poll_schedule_timeout`, and max CPU around 0.9%.
The cautious code-level inference is that `munin-node` was idle in Net::Server’s accept/wait path, or another normal blocking wait, rather than in a tight Munin or Perl runtime loop. I inspected the script entrypoint and local daemon code first (`script/munin-node`, `lib/Munin/Node/Server.pm`, `lib/Munin/Node/OS.pm`, `lib/Munin/Common/Timeout.pm`). Local patterns include `Munin::Common::Timeout::do_with_timeout`, `Munin::Common::Logger`, `Munin::Common::Daemon::emit_sd_notify_message`, and Net::Server callbacks; no relevant local wrapper was found for Net::Server’s accept-loop wait.
I made no source change. This follows the prior plan: the evidence is profiler/strace-based and did not retain a Perl-level stack tying the wait to faulty application logic. The expected effect is to avoid an upstream timing/throttling patch until a maintainer or follow-up run captures stronger evidence, such as near-zero timeout polling, unexpected wakeups, or a Perl-level stack in a real busy loop.
## Git Add Paths
None
## Validation
`make` from the workspace root failed before build:
`Can't locate Module/Build.pm in @INC ... at Build.PL line 80`, followed by `make: *** [Makefile:149: Build] Error 2`.
`make check` failed because the target is not available:
`make: *** No rule to make target 'check'. Stop.`
Narrow checks:
`perl -T -Ilib -c script/munin-node` passed.
`perl -Ilib -c lib/Munin/Node/Server.pm` passed.
`perl -Ilib -c lib/Munin/Node/OS.pm` passed with existing “Subroutine ... redefined” warnings, then `syntax OK`.
Independent reproduction attempt:
`strace -ff -ttT -e trace=pselect6,select,poll,ppoll,epoll_wait,... munin-node --foreground ...` was blocked by sandbox ptrace restrictions: `PTRACE_TRACEME: Operation not permitted`. A fallback timed daemon smoke also could not provide a valid reproduction, so the busy-poll failure was not independently reproduced.
## Review Pass 1
RESULT: ok
No source changes are present in the workspace, which matches the no-patch diagnosis. The response uses valid `## Evidence Confidence` value `inferred`, does not overclaim reproduction, names the profiler/strace evidence limit, reports the project-level `make` blocker and missing `make check` target, and avoids a speculative timing/throttling patch without reproduced evidence.
The maintainer-facing explanation is acceptable: it connects the collected `pselect6`, sleeping state, `wchan`, and low CPU evidence to the decision not to patch Munin or Perl, and it names relevant local helpers/conventions (`do_with_timeout`, `Munin::Common::Logger`, `emit_sd_notify_message`, Net::Server callbacks).perl likely remains stuck in a busy-poll loop. A diagnosis report and patch proposal were created locally.
## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.
## Patch Pass
You are working on a bounded fixer proposal.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Produce the smallest reasonable patch for the target repository, keep the change upstreamable, prefer the clearest control flow available, and do not keep avoidable `goto` when a simpler structure would read better. Before introducing new file, process, allocation, locking, networking, or platform APIs, inspect nearby code and project contribution docs for existing helpers or compatibility wrappers and use those local patterns unless you can explain why they do not fit. Validate from a reproducible workspace-root entrypoint before falling back to focused leaf commands; if a build or test cannot run, report the exact command, the exact blocker, and any narrower check you ran instead. During validation, also try one bounded independent reproduction of the collected failure signal when it is safe and cheap, such as a failing test, smoke command, perf/strace comparison, or before/after runtime check. Only use `reproduced` if that command or test actually reproduced the failure; otherwise keep `observed` and report the reproduction blocker. The final explanation must connect the observed issue evidence to the actual code change, not just paraphrase the diff. Write like a maintainer is going to read the patch mail cold: explain the bug in plain language, define subsystem-specific jargon the first time you need it, and make the causal story obvious. Explicitly classify evidence confidence as `reproduced`, `observed`, or `inferred`: `reproduced` means you reproduced the failure locally; `observed` means Fixer has direct crash/log/trace evidence but you did not independently reproduce it; `inferred` means the source patch is not pull-request-ready, so do not leave a source diff unless you first gather stronger observed/reproduced evidence; otherwise return a no-patch diagnosis/report. For any source-changing `observed` patch, say explicitly in `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. Security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior need reproduced evidence plus explicit security-impact analysis before leaving a source diff; otherwise return a no-patch diagnosis/report for human review. If you introduce non-obvious state translation, index remapping, or backend split logic, add a short source comment that explains the invariant being preserved.
Start by explaining the likely root cause from the collected perf, strace, and /proc evidence. If you cannot land a safe patch, leave a diagnosis that is strong enough for an upstream bug report.
Interpreter process expectation: when the hot process is Python, Perl, shell, Node, Ruby, PHP, Lua, or another interpreter, inspect both the runtime and the script/application entrypoint from `details.interpreter_process`. Prefer the script or application package when evidence points there; do not patch the interpreter runtime merely because the hot binary is `python`, `perl`, `bash`, or similar. Runtime fixes are welcome only after checking the entrypoint and explaining why the runtime mishandles the workload or why running bad code faster/safer is itself the right upstream fix.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Keep the change narrowly scoped and summarize validation clearly.
In every authoring pass, your final response must start with `Subject: <single-line git commit subject>` and then include these markdown sections exactly:
## Commit Message
A short upstream-friendly explanation of what changed and why. Write it in plain language that a maintainer can follow without local complaint context. If you use subsystem jargon, define it immediately.
## Evidence Confidence
Exactly one word: `reproduced`, `observed`, or `inferred`. Use `reproduced` only when you reproduced the failure locally with a command or test, and include that command/test in `## Validation`. Use `observed` when Fixer has direct crash/log/trace evidence but you did not independently reproduce it. If `## Git Add Paths` lists source files for an `observed` patch, `## Issue Connection` must explicitly say the failure was observed by Fixer and not independently reproduced. Security-sensitive source changes touching authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior require reproduced evidence and explicit security-impact analysis; otherwise list `None` under `## Git Add Paths` and write a no-patch diagnosis/report. Use `inferred` for profiler/strace/indirect evidence; inferred responses may be no-patch diagnoses or reports, but inferred source patches are not pull-request-ready until stronger evidence is gathered.
## Issue Connection
Write this as maintainer-facing patch mail, not as local Fixer notes. Cover four things explicitly in readable sentences: the user-visible symptom or the exact collected signal, the code-level cause or the cautious inference from evidence, the specific change you made, and the expected effect. Do not invent a reproducer, command line, crash, or user-visible failure that is not present in the evidence bundle. If the evidence is direct-but-not-reproduced, say it was observed by Fixer and not independently reproduced. If the evidence is indirect and you did not gather stronger evidence, do not leave a source diff; write a no-patch diagnosis/report instead. Include an explicit effect sentence such as `The expected effect is ...`, `This should reduce ...`, or `This prevents ...` for source patches. If the logic is non-obvious in code, mention that you added a short explanatory comment.
## Git Add Paths
List the repo-relative paths that belong in the final patch, one per line. Use `None` only when you intentionally made no source changes. Include intentionally new files, and do not list generated build artifacts.
## Validation
List the checks you ran, or say clearly that you could not run them. Include the independent reproduction command/test and result when `## Evidence Confidence` is `reproduced`; if reproduction was attempted but blocked, name the exact blocker and keep confidence at `observed` or `inferred`.
Before editing, read the plan at `./plan-output.txt` and follow it unless the code proves part of it wrong. If you change course, say so explicitly in the final write-up instead of silently drifting from the plan.
## Review Pass 1
You are reviewing a freshly generated fixer patch.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Review the first patch pass. The original pre-edit snapshot is available at `./source` for diffing.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout. The latest author response is at `./patch-output.txt`. Inspect the current code and changed paths like a strict code reviewer. Focus on correctness, regressions, maintainability, awkward control flow such as avoidable `goto`, missing validation, weak or non-gittable commit message text, and explanations that fail to connect the observed issue evidence to the code change. Also review the maintainer experience: the patch mail should be easy to accept upstream, the user-visible bug should be explained in plain language, subsystem-specific jargon should be defined when first used, and any non-obvious state translation or index remapping in code should have a short explanatory comment. Reject patches that omit `## Evidence Confidence`, use anything other than `reproduced`, `observed`, or `inferred`, or sound more certain than that evidence level allows. Reject patches that claim `reproduced` unless `## Validation` names the concrete reproduction command or test and its result. Reject source patches in security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior unless the author reproduced the behavior and explicitly analyzed the security impact of the change; observed-only evidence should become a diagnosis/report, not a PR-ready source diff. Reject patches that invent a reproducer, command line, crash, or user-visible failure not present in the evidence bundle; indirect profiler or strace evidence may justify a cautious mitigation, but the author must say it is indirect instead of presenting it as a confirmed upstream bug. Reject patches that introduce generic libc/std APIs when nearby code or project docs provide a local compat/helper API for the same job, unless the author explicitly justifies the exception. Reject validation that only reports a leaf object/syntax build when a project-level configure/build/test entrypoint exists and was not attempted; if a full build cannot run, the author must show the exact failed command and blocker.
Do not apply code changes in this pass.
Return a short markdown review report. The first non-empty line must be exactly one of:
RESULT: ok
RESULT: fix-needed
If you choose `RESULT: fix-needed`, add a `## Findings` section with concrete, actionable items.## Plan Pass
## Problem
Fixer observed `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` in a repeated `pselect6` path, but the retained evidence does not show a Perl-level stack or a tight application loop. The strace excerpt shows blocking `pselect6` calls of about 1.8-2.0 seconds, process state `S (sleeping)`, and max CPU around 0.9%, so this looks more like normal daemon wait behavior than a confirmed runaway CPU bug.
## Evidence Confidence
observed
## Proposed Subject
No upstream source patch yet: diagnose the Fixer signal as insufficient for a pull-request-ready Munin change unless a bounded reproduction can show short/zero-timeout polling or unexpected wakeups in `munin-node`.
## Patch Plan
Do not edit in this pass. The evidence is profiler-only and points at a Perl script entrypoint, so the investigation should stay in Munin first, not Perl runtime.
Relevant code paths inspected: `script/munin-node`, `lib/Munin/Node/Server.pm`, `lib/Munin/Node/OS.pm`, and `lib/Munin/Common/Timeout.pm`. Local conventions/helpers to follow if later evidence supports a patch: `Munin::Common::Timeout::do_with_timeout` for bounded work, `Munin::Common::Logger` for logging, Net::Server callbacks for daemon behavior, `strict`/`warnings`, `English qw(-no_match_vars)`, and existing file indentation. No local wrapper was found for Net::Server’s accept-loop polling itself.
A timing/select-timeout source patch is blocked for now because it would change daemon timing behavior without a reproduced failure, and the observed `pselect6` calls are sleeping for seconds rather than spinning. No prior Fixer patch for this issue was found; existing Debian patches are unrelated.
## Risks
Changing timeout or select behavior speculatively could affect signal responsiveness, daemon shutdown/reload timing, connection acceptance, or plugin timeout handling. It could also hide a false-positive profiler signal instead of fixing a real Munin bug.
## Validation
For any later patch, first try project-level validation from the workspace root: `make`. There is no visible `make check` target in `Makefile`; use `make test` as the project test entrypoint after `make`.
Bounded independent reproduction before editing: run `munin-node --foreground` from a built tree with a test/sandbox config under `timeout`, trace `pselect6/select/poll`, and confirm whether waits are near-zero or multi-second. Only proceed with a source patch if that command shows an actual busy poll tied to Munin code; otherwise report this as observed-but-not-reproduced profiler evidence.
## Patch Pass
Subject: Diagnose munin-node poll profile as idle wait
## Commit Message
No source change. The collected perf, strace, and `/proc` data most likely shows `munin-node` sleeping in its daemon wait loop, not spinning. A timing patch would be speculative and would touch daemon wait behavior without a reproduced busy-poll failure.
## Evidence Confidence
inferred
## Issue Connection
Fixer collected a Perl process running `munin-node --foreground` with native frames under `select()`/`pselect6`. The same bundle shows only three `pselect6` calls over five seconds, each blocking for about 1.8-2.0 seconds, with process state `S (sleeping)`, `wchan` at `poll_schedule_timeout`, and max CPU around 0.9%.
The cautious code-level inference is that `munin-node` was idle in Net::Server’s accept/wait path, or another normal blocking wait, rather than in a tight Munin or Perl runtime loop. I inspected the script entrypoint and local daemon code first (`script/munin-node`, `lib/Munin/Node/Server.pm`, `lib/Munin/Node/OS.pm`, `lib/Munin/Common/Timeout.pm`). Local patterns include `Munin::Common::Timeout::do_with_timeout`, `Munin::Common::Logger`, `Munin::Common::Daemon::emit_sd_notify_message`, and Net::Server callbacks; no relevant local wrapper was found for Net::Server’s accept-loop wait.
I made no source change. This follows the prior plan: the evidence is profiler/strace-based and did not retain a Perl-level stack tying the wait to faulty application logic. The expected effect is to avoid an upstream timing/throttling patch until a maintainer or follow-up run captures stronger evidence, such as near-zero timeout polling, unexpected wakeups, or a Perl-level stack in a real busy loop.
## Git Add Paths
None
## Validation
`make` from the workspace root failed before build:
`Can't locate Module/Build.pm in @INC ... at Build.PL line 80`, followed by `make: *** [Makefile:149: Build] Error 2`.
`make check` failed because the target is not available:
`make: *** No rule to make target 'check'. Stop.`
Narrow checks:
`perl -T -Ilib -c script/munin-node` passed.
`perl -Ilib -c lib/Munin/Node/Server.pm` passed.
`perl -Ilib -c lib/Munin/Node/OS.pm` passed with existing “Subroutine ... redefined” warnings, then `syntax OK`.
Independent reproduction attempt:
`strace -ff -ttT -e trace=pselect6,select,poll,ppoll,epoll_wait,... munin-node --foreground ...` was blocked by sandbox ptrace restrictions: `PTRACE_TRACEME: Operation not permitted`. A fallback timed daemon smoke also could not provide a valid reproduction, so the busy-poll failure was not independently reproduced.
## Review Pass 1
RESULT: ok
No source changes are present in the workspace, which matches the no-patch diagnosis. The response uses valid `## Evidence Confidence` value `inferred`, does not overclaim reproduction, names the profiler/strace evidence limit, reports the project-level `make` blocker and missing `make check` target, and avoids a speculative timing/throttling patch without reproduced evidence.
The maintainer-facing explanation is acceptable: it connects the collected `pselect6`, sleeping state, `wchan`, and low CPU evidence to the decision not to patch Munin or Perl, and it names relevant local helpers/conventions (`do_with_timeout`, `Munin::Common::Logger`, `emit_sd_notify_message`, Net::Server callbacks).perl likely remains stuck in a busy-poll loop. A diagnosis report and patch proposal were created locally.
## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.
## Patch Pass
You are working on a bounded fixer proposal.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Produce the smallest reasonable patch for the target repository, keep the change upstreamable, prefer the clearest control flow available, and do not keep avoidable `goto` when a simpler structure would read better. Before introducing new file, process, allocation, locking, networking, or platform APIs, inspect nearby code and project contribution docs for existing helpers or compatibility wrappers and use those local patterns unless you can explain why they do not fit. Validate from a reproducible workspace-root entrypoint before falling back to focused leaf commands; if a build or test cannot run, report the exact command, the exact blocker, and any narrower check you ran instead. During validation, also try one bounded independent reproduction of the collected failure signal when it is safe and cheap, such as a failing test, smoke command, perf/strace comparison, or before/after runtime check. Only use `reproduced` if that command or test actually reproduced the failure; otherwise keep `observed` and report the reproduction blocker. The final explanation must connect the observed issue evidence to the actual code change, not just paraphrase the diff. Write like a maintainer is going to read the patch mail cold: explain the bug in plain language, define subsystem-specific jargon the first time you need it, and make the causal story obvious. Explicitly classify evidence confidence as `reproduced`, `observed`, or `inferred`: `reproduced` means you reproduced the failure locally; `observed` means Fixer has direct crash/log/trace evidence but you did not independently reproduce it; `inferred` means the source patch is not pull-request-ready, so do not leave a source diff unless you first gather stronger observed/reproduced evidence; otherwise return a no-patch diagnosis/report. For any source-changing `observed` patch, say explicitly in `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. Security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior need reproduced evidence plus explicit security-impact analysis before leaving a source diff; otherwise return a no-patch diagnosis/report for human review. If you introduce non-obvious state translation, index remapping, or backend split logic, add a short source comment that explains the invariant being preserved.
Start by explaining the likely root cause from the collected perf, strace, and /proc evidence. If you cannot land a safe patch, leave a diagnosis that is strong enough for an upstream bug report.
Interpreter process expectation: when the hot process is Python, Perl, shell, Node, Ruby, PHP, Lua, or another interpreter, inspect both the runtime and the script/application entrypoint from `details.interpreter_process`. Prefer the script or application package when evidence points there; do not patch the interpreter runtime merely because the hot binary is `python`, `perl`, `bash`, or similar. Runtime fixes are welcome only after checking the entrypoint and explaining why the runtime mishandles the workload or why running bad code faster/safer is itself the right upstream fix.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Keep the change narrowly scoped and summarize validation clearly.
In every authoring pass, your final response must start with `Subject: <single-line git commit subject>` and then include these markdown sections exactly:
## Commit Message
A short upstream-friendly explanation of what changed and why. Write it in plain language that a maintainer can follow without local complaint context. If you use subsystem jargon, define it immediately.
## Evidence Confidence
Exactly one word: `reproduced`, `observed`, or `inferred`. Use `reproduced` only when you reproduced the failure locally with a command or test, and include that command/test in `## Validation`. Use `observed` when Fixer has direct crash/log/trace evidence but you did not independently reproduce it. If `## Git Add Paths` lists source files for an `observed` patch, `## Issue Connection` must explicitly say the failure was observed by Fixer and not independently reproduced. Security-sensitive source changes touching authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior require reproduced evidence and explicit security-impact analysis; otherwise list `None` under `## Git Add Paths` and write a no-patch diagnosis/report. Use `inferred` for profiler/strace/indirect evidence; inferred responses may be no-patch diagnoses or reports, but inferred source patches are not pull-request-ready until stronger evidence is gathered.
## Issue Connection
Write this as maintainer-facing patch mail, not as local Fixer notes. Cover four things explicitly in readable sentences: the user-visible symptom or the exact collected signal, the code-level cause or the cautious inference from evidence, the specific change you made, and the expected effect. Do not invent a reproducer, command line, crash, or user-visible failure that is not present in the evidence bundle. If the evidence is direct-but-not-reproduced, say it was observed by Fixer and not independently reproduced. If the evidence is indirect and you did not gather stronger evidence, do not leave a source diff; write a no-patch diagnosis/report instead. Include an explicit effect sentence such as `The expected effect is ...`, `This should reduce ...`, or `This prevents ...` for source patches. If the logic is non-obvious in code, mention that you added a short explanatory comment.
## Git Add Paths
List the repo-relative paths that belong in the final patch, one per line. Use `None` only when you intentionally made no source changes. Include intentionally new files, and do not list generated build artifacts.
## Validation
List the checks you ran, or say clearly that you could not run them. Include the independent reproduction command/test and result when `## Evidence Confidence` is `reproduced`; if reproduction was attempted but blocked, name the exact blocker and keep confidence at `observed` or `inferred`.
Before editing, read the plan at `./plan-output.txt` and follow it unless the code proves part of it wrong. If you change course, say so explicitly in the final write-up instead of silently drifting from the plan.
## Review Pass 1
You are reviewing a freshly generated fixer patch.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Review the first patch pass. The original pre-edit snapshot is available at `./source` for diffing.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout. The latest author response is at `./patch-output.txt`. Inspect the current code and changed paths like a strict code reviewer. Focus on correctness, regressions, maintainability, awkward control flow such as avoidable `goto`, missing validation, weak or non-gittable commit message text, and explanations that fail to connect the observed issue evidence to the code change. Also review the maintainer experience: the patch mail should be easy to accept upstream, the user-visible bug should be explained in plain language, subsystem-specific jargon should be defined when first used, and any non-obvious state translation or index remapping in code should have a short explanatory comment. Reject patches that omit `## Evidence Confidence`, use anything other than `reproduced`, `observed`, or `inferred`, or sound more certain than that evidence level allows. Reject patches that claim `reproduced` unless `## Validation` names the concrete reproduction command or test and its result. Reject source patches in security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior unless the author reproduced the behavior and explicitly analyzed the security impact of the change; observed-only evidence should become a diagnosis/report, not a PR-ready source diff. Reject patches that invent a reproducer, command line, crash, or user-visible failure not present in the evidence bundle; indirect profiler or strace evidence may justify a cautious mitigation, but the author must say it is indirect instead of presenting it as a confirmed upstream bug. Reject patches that introduce generic libc/std APIs when nearby code or project docs provide a local compat/helper API for the same job, unless the author explicitly justifies the exception. Reject validation that only reports a leaf object/syntax build when a project-level configure/build/test entrypoint exists and was not attempted; if a full build cannot run, the author must show the exact failed command and blocker.
Do not apply code changes in this pass.
Return a short markdown review report. The first non-empty line must be exactly one of:
RESULT: ok
RESULT: fix-needed
If you choose `RESULT: fix-needed`, add a `## Findings` section with concrete, actionable items.## Plan Pass
## Problem
Fixer observed `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` in `pselect6`, but the retained evidence does not prove a Munin source bug. The excerpts show `munin-node` sleeping in `poll_schedule_timeout`, with `pselect6` calls timing out after about 1.8 to 2.0 seconds and only 0.9% CPU reported, which looks more like the normal `Net::Server::Fork` accept loop than a confirmed busy spin.
## Evidence Confidence
observed
## Proposed Subject
No source patch yet: treat this as a diagnosis/report plan unless a bounded reproduction ties the sampled loop to Munin application logic.
## Patch Plan
Do not edit `munin` in this pass. The evidence bundle lacks the raw investigation files and no Perl-level stack or reproducer identifies a problematic source line.
If additional evidence later proves an application-level tight loop, inspect `script/munin-node` and `lib/Munin/Node/Server.pm` first, not Perl runtime code. Follow local conventions from `CONTRIBUTING.md` and `HACKING.pod`: strict/warnings Perl, taint-mode compatibility, existing indentation style, no warnings, present-tense maintainer explanation.
Use local helpers/conventions already present in the subsystem: `Net::Server::Fork` callbacks for server lifecycle, `Munin::Common::Timeout::do_with_timeout` for bounded work, `Munin::Common::Logger` for diagnostics, and `Munin::Node::OS->run_as_child` for plugin subprocess handling. No relevant local wrapper was found for the `Net::Server` accept-loop wait itself.
No prior Fixer patch is present in git history beyond `Fixer baseline`; Debian quilt patches found are unrelated to this node event-loop evidence. No control-flow patch is planned, and any future patch should avoid awkward `goto` in favor of small bounded branches/returns.
## Risks
Patching from the current evidence would likely be speculative and could disrupt normal `munin-node` daemon behavior, connection handling, TLS negotiation, or plugin execution timeouts.
This touches daemon timing if pursued, so a source patch should wait for a reproducible signal showing real CPU spin or excessive wakeups and an analysis of behavior impact.
## Validation
First try project-level entrypoints from the workspace root after any future change: `make`, then `make check` if that target exists; this Makefile exposes `make test`, so use `make test` as the project test command if `make check` is unavailable.
Bounded independent reproduction before editing: run `munin-node --foreground` from the built tree with a minimal test config and trace `pselect6/select/poll` for a few seconds. Only claim reproduced if the trace shows rapid nonblocking wakeups or meaningful CPU use; a two-second `pselect6` timeout loop should be documented as non-reproduction.
## Patch Pass
Subject: No patch: diagnose munin-node idle select trace
## Commit Message
No source change was made. The collected perf, strace, and `/proc` evidence points to an idle `munin-node` process blocked in the `Net::Server::Fork` listener wait, not to a proved Munin or Perl runtime busy loop. The strace excerpt shows `pselect6` calls sleeping for about two seconds, while `/proc` reports the process in `S (sleeping)` with `wchan` at `poll_schedule_timeout`.
## Evidence Confidence
observed
## Issue Connection
Fixer observed `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` with repeated `pselect6` frames and classified it as a likely busy poll loop. That failure signal was observed by Fixer and not independently reproduced here.
The cautious code-level inference is that the sampled process was the `munin-node` Perl entrypoint waiting in the `Net::Server::Fork` accept loop. The retained strace has only three `pselect6` lines over five seconds, with timeouts of about 1.8 and 2.0 seconds, and `/proc` says the task was sleeping. I inspected the script entrypoint before the runtime as requested; `script/munin-node` delegates serving to `Munin::Node::Server`, which subclasses `Net::Server::Fork`. Plugin subprocess work is already bounded through local helpers `Munin::Common::Timeout::do_with_timeout` and `Munin::Node::OS->run_as_child`, and diagnostics use `Munin::Common::Logger`.
I did not make a code change because changing listener timing or daemon wait behavior from this evidence would be speculative and timing-sensitive. The expected effect of this no-patch result is to avoid an upstream diff that could alter normal daemon behavior without a reproduced excessive wakeup rate or a Perl-level stack tying the wait loop to Munin application logic.
I followed the saved plan and did not change course: the plan required a no-patch diagnosis unless a bounded reproduction tied the sampled wait loop to Munin logic. Contribution/style docs checked: `CONTRIBUTING.md` and `HACKING.pod`; no relevant local wrapper was found for the underlying `Net::Server` accept-loop wait itself. I also inspected the Perl runtime context (`perl 5.40.1`) and found no evidence that the runtime mishandled this workload.
## Git Add Paths
None
## Validation
`make` from the workspace root failed before building:
`Can't locate Module/Build.pm in @INC ... at Build.PL line 80`, followed by `make: *** [Makefile:149: Build] Error 2`.
`make check` from the workspace root failed because no such target exists:
`make: *** No rule to make target 'check'. Stop.`
Narrow checks run:
`PERL5LIB=lib perl -T -c script/munin-node` passed with `script/munin-node syntax OK`.
`PERL5LIB=lib perl -c lib/Munin/Node/Server.pm` passed with `lib/Munin/Node/Server.pm syntax OK`.
Independent reproduction attempts:
`strace -ttT -f ... munin-node --foreground` was blocked by sandbox ptrace restrictions: `PTRACE_TRACEME: Operation not permitted`.
A non-ptrace foreground smoke run with a temporary config reached `Net::Server::Fork` startup but could not bind the test loopback port: `Cannot bind and listen to TCP port 24949 on 127.0.0.1 [Operation not permitted]`. Therefore the local run could not reproduce the observed idle `pselect6` signal.
## Review Pass 1
RESULT: ok
No source diff is present, which matches the diagnosis-only conclusion. The author checked the evidence limits, inspected the Perl entrypoint before considering the runtime, named relevant Munin helpers/conventions, attempted the project-level commands first, and kept confidence at `observed` rather than claiming local reproduction.
Validation blockers are reported with the relevant commands and failure reasons, and the no-patch explanation does not invent a user-visible failure beyond the Fixer trace evidence.perl likely remains stuck in a busy-poll loop. A diagnosis report and patch proposal were created locally.
## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.
## Patch Pass
You are working on a bounded fixer proposal.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Produce the smallest reasonable patch for the target repository, keep the change upstreamable, prefer the clearest control flow available, and do not keep avoidable `goto` when a simpler structure would read better. Before introducing new file, process, allocation, locking, networking, or platform APIs, inspect nearby code and project contribution docs for existing helpers or compatibility wrappers and use those local patterns unless you can explain why they do not fit. Validate from a reproducible workspace-root entrypoint before falling back to focused leaf commands; if a build or test cannot run, report the exact command, the exact blocker, and any narrower check you ran instead. During validation, also try one bounded independent reproduction of the collected failure signal when it is safe and cheap, such as a failing test, smoke command, perf/strace comparison, or before/after runtime check. Only use `reproduced` if that command or test actually reproduced the failure; otherwise keep `observed` and report the reproduction blocker. The final explanation must connect the observed issue evidence to the actual code change, not just paraphrase the diff. Write like a maintainer is going to read the patch mail cold: explain the bug in plain language, define subsystem-specific jargon the first time you need it, and make the causal story obvious. Explicitly classify evidence confidence as `reproduced`, `observed`, or `inferred`: `reproduced` means you reproduced the failure locally; `observed` means Fixer has direct crash/log/trace evidence but you did not independently reproduce it; `inferred` means the source patch is not pull-request-ready, so do not leave a source diff unless you first gather stronger observed/reproduced evidence; otherwise return a no-patch diagnosis/report. For any source-changing `observed` patch, say explicitly in `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. Security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior need reproduced evidence plus explicit security-impact analysis before leaving a source diff; otherwise return a no-patch diagnosis/report for human review. If you introduce non-obvious state translation, index remapping, or backend split logic, add a short source comment that explains the invariant being preserved.
Start by explaining the likely root cause from the collected perf, strace, and /proc evidence. If you cannot land a safe patch, leave a diagnosis that is strong enough for an upstream bug report.
Interpreter process expectation: when the hot process is Python, Perl, shell, Node, Ruby, PHP, Lua, or another interpreter, inspect both the runtime and the script/application entrypoint from `details.interpreter_process`. Prefer the script or application package when evidence points there; do not patch the interpreter runtime merely because the hot binary is `python`, `perl`, `bash`, or similar. Runtime fixes are welcome only after checking the entrypoint and explaining why the runtime mishandles the workload or why running bad code faster/safer is itself the right upstream fix.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Keep the change narrowly scoped and summarize validation clearly.
In every authoring pass, your final response must start with `Subject: <single-line git commit subject>` and then include these markdown sections exactly:
## Commit Message
A short upstream-friendly explanation of what changed and why. Write it in plain language that a maintainer can follow without local complaint context. If you use subsystem jargon, define it immediately.
## Evidence Confidence
Exactly one word: `reproduced`, `observed`, or `inferred`. Use `reproduced` only when you reproduced the failure locally with a command or test, and include that command/test in `## Validation`. Use `observed` when Fixer has direct crash/log/trace evidence but you did not independently reproduce it. If `## Git Add Paths` lists source files for an `observed` patch, `## Issue Connection` must explicitly say the failure was observed by Fixer and not independently reproduced. Security-sensitive source changes touching authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior require reproduced evidence and explicit security-impact analysis; otherwise list `None` under `## Git Add Paths` and write a no-patch diagnosis/report. Use `inferred` for profiler/strace/indirect evidence; inferred responses may be no-patch diagnoses or reports, but inferred source patches are not pull-request-ready until stronger evidence is gathered.
## Issue Connection
Write this as maintainer-facing patch mail, not as local Fixer notes. Cover four things explicitly in readable sentences: the user-visible symptom or the exact collected signal, the code-level cause or the cautious inference from evidence, the specific change you made, and the expected effect. Do not invent a reproducer, command line, crash, or user-visible failure that is not present in the evidence bundle. If the evidence is direct-but-not-reproduced, say it was observed by Fixer and not independently reproduced. If the evidence is indirect and you did not gather stronger evidence, do not leave a source diff; write a no-patch diagnosis/report instead. Include an explicit effect sentence such as `The expected effect is ...`, `This should reduce ...`, or `This prevents ...` for source patches. If the logic is non-obvious in code, mention that you added a short explanatory comment.
## Git Add Paths
List the repo-relative paths that belong in the final patch, one per line. Use `None` only when you intentionally made no source changes. Include intentionally new files, and do not list generated build artifacts.
## Validation
List the checks you ran, or say clearly that you could not run them. Include the independent reproduction command/test and result when `## Evidence Confidence` is `reproduced`; if reproduction was attempted but blocked, name the exact blocker and keep confidence at `observed` or `inferred`.
Before editing, read the plan at `./plan-output.txt` and follow it unless the code proves part of it wrong. If you change course, say so explicitly in the final write-up instead of silently drifting from the plan.
## Review Pass 1
You are reviewing a freshly generated fixer patch.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Review the first patch pass. The original pre-edit snapshot is available at `./source` for diffing.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout. The latest author response is at `./patch-output.txt`. Inspect the current code and changed paths like a strict code reviewer. Focus on correctness, regressions, maintainability, awkward control flow such as avoidable `goto`, missing validation, weak or non-gittable commit message text, and explanations that fail to connect the observed issue evidence to the code change. Also review the maintainer experience: the patch mail should be easy to accept upstream, the user-visible bug should be explained in plain language, subsystem-specific jargon should be defined when first used, and any non-obvious state translation or index remapping in code should have a short explanatory comment. Reject patches that omit `## Evidence Confidence`, use anything other than `reproduced`, `observed`, or `inferred`, or sound more certain than that evidence level allows. Reject patches that claim `reproduced` unless `## Validation` names the concrete reproduction command or test and its result. Reject source patches in security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior unless the author reproduced the behavior and explicitly analyzed the security impact of the change; observed-only evidence should become a diagnosis/report, not a PR-ready source diff. Reject patches that invent a reproducer, command line, crash, or user-visible failure not present in the evidence bundle; indirect profiler or strace evidence may justify a cautious mitigation, but the author must say it is indirect instead of presenting it as a confirmed upstream bug. Reject patches that introduce generic libc/std APIs when nearby code or project docs provide a local compat/helper API for the same job, unless the author explicitly justifies the exception. Reject validation that only reports a leaf object/syntax build when a project-level configure/build/test entrypoint exists and was not attempted; if a full build cannot run, the author must show the exact failed command and blocker.
Do not apply code changes in this pass.
Return a short markdown review report. The first non-empty line must be exactly one of:
RESULT: ok
RESULT: fix-needed
If you choose `RESULT: fix-needed`, add a `## Findings` section with concrete, actionable items.## Plan Pass
## Problem
Fixer observed `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` in `pselect6`, but the retained evidence does not prove a Munin source bug. The excerpts show `munin-node` sleeping in `poll_schedule_timeout`, with `pselect6` calls timing out after about 1.8 to 2.0 seconds and only 0.9% CPU reported, which looks more like the normal `Net::Server::Fork` accept loop than a confirmed busy spin.
## Evidence Confidence
observed
## Proposed Subject
No source patch yet: treat this as a diagnosis/report plan unless a bounded reproduction ties the sampled loop to Munin application logic.
## Patch Plan
Do not edit `munin` in this pass. The evidence bundle lacks the raw investigation files and no Perl-level stack or reproducer identifies a problematic source line.
If additional evidence later proves an application-level tight loop, inspect `script/munin-node` and `lib/Munin/Node/Server.pm` first, not Perl runtime code. Follow local conventions from `CONTRIBUTING.md` and `HACKING.pod`: strict/warnings Perl, taint-mode compatibility, existing indentation style, no warnings, present-tense maintainer explanation.
Use local helpers/conventions already present in the subsystem: `Net::Server::Fork` callbacks for server lifecycle, `Munin::Common::Timeout::do_with_timeout` for bounded work, `Munin::Common::Logger` for diagnostics, and `Munin::Node::OS->run_as_child` for plugin subprocess handling. No relevant local wrapper was found for the `Net::Server` accept-loop wait itself.
No prior Fixer patch is present in git history beyond `Fixer baseline`; Debian quilt patches found are unrelated to this node event-loop evidence. No control-flow patch is planned, and any future patch should avoid awkward `goto` in favor of small bounded branches/returns.
## Risks
Patching from the current evidence would likely be speculative and could disrupt normal `munin-node` daemon behavior, connection handling, TLS negotiation, or plugin execution timeouts.
This touches daemon timing if pursued, so a source patch should wait for a reproducible signal showing real CPU spin or excessive wakeups and an analysis of behavior impact.
## Validation
First try project-level entrypoints from the workspace root after any future change: `make`, then `make check` if that target exists; this Makefile exposes `make test`, so use `make test` as the project test command if `make check` is unavailable.
Bounded independent reproduction before editing: run `munin-node --foreground` from the built tree with a minimal test config and trace `pselect6/select/poll` for a few seconds. Only claim reproduced if the trace shows rapid nonblocking wakeups or meaningful CPU use; a two-second `pselect6` timeout loop should be documented as non-reproduction.
## Patch Pass
Subject: No patch: diagnose munin-node idle select trace
## Commit Message
No source change was made. The collected perf, strace, and `/proc` evidence points to an idle `munin-node` process blocked in the `Net::Server::Fork` listener wait, not to a proved Munin or Perl runtime busy loop. The strace excerpt shows `pselect6` calls sleeping for about two seconds, while `/proc` reports the process in `S (sleeping)` with `wchan` at `poll_schedule_timeout`.
## Evidence Confidence
observed
## Issue Connection
Fixer observed `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` with repeated `pselect6` frames and classified it as a likely busy poll loop. That failure signal was observed by Fixer and not independently reproduced here.
The cautious code-level inference is that the sampled process was the `munin-node` Perl entrypoint waiting in the `Net::Server::Fork` accept loop. The retained strace has only three `pselect6` lines over five seconds, with timeouts of about 1.8 and 2.0 seconds, and `/proc` says the task was sleeping. I inspected the script entrypoint before the runtime as requested; `script/munin-node` delegates serving to `Munin::Node::Server`, which subclasses `Net::Server::Fork`. Plugin subprocess work is already bounded through local helpers `Munin::Common::Timeout::do_with_timeout` and `Munin::Node::OS->run_as_child`, and diagnostics use `Munin::Common::Logger`.
I did not make a code change because changing listener timing or daemon wait behavior from this evidence would be speculative and timing-sensitive. The expected effect of this no-patch result is to avoid an upstream diff that could alter normal daemon behavior without a reproduced excessive wakeup rate or a Perl-level stack tying the wait loop to Munin application logic.
I followed the saved plan and did not change course: the plan required a no-patch diagnosis unless a bounded reproduction tied the sampled wait loop to Munin logic. Contribution/style docs checked: `CONTRIBUTING.md` and `HACKING.pod`; no relevant local wrapper was found for the underlying `Net::Server` accept-loop wait itself. I also inspected the Perl runtime context (`perl 5.40.1`) and found no evidence that the runtime mishandled this workload.
## Git Add Paths
None
## Validation
`make` from the workspace root failed before building:
`Can't locate Module/Build.pm in @INC ... at Build.PL line 80`, followed by `make: *** [Makefile:149: Build] Error 2`.
`make check` from the workspace root failed because no such target exists:
`make: *** No rule to make target 'check'. Stop.`
Narrow checks run:
`PERL5LIB=lib perl -T -c script/munin-node` passed with `script/munin-node syntax OK`.
`PERL5LIB=lib perl -c lib/Munin/Node/Server.pm` passed with `lib/Munin/Node/Server.pm syntax OK`.
Independent reproduction attempts:
`strace -ttT -f ... munin-node --foreground` was blocked by sandbox ptrace restrictions: `PTRACE_TRACEME: Operation not permitted`.
A non-ptrace foreground smoke run with a temporary config reached `Net::Server::Fork` startup but could not bind the test loopback port: `Cannot bind and listen to TCP port 24949 on 127.0.0.1 [Operation not permitted]`. Therefore the local run could not reproduce the observed idle `pselect6` signal.
## Review Pass 1
RESULT: ok
No source diff is present, which matches the diagnosis-only conclusion. The author checked the evidence limits, inspected the Perl entrypoint before considering the runtime, named relevant Munin helpers/conventions, attempted the project-level commands first, and kept confidence at `observed` rather than claiming local reproduction.
Validation blockers are reported with the relevant commands and failure reasons, and the no-patch explanation does not invent a user-visible failure beyond the Fixer trace evidence.perl likely remains stuck in a busy-poll loop. A diagnosis report and patch proposal were created locally.
## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.
## Patch Pass
You are working on a bounded fixer proposal.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Produce the smallest reasonable patch for the target repository, keep the change upstreamable, prefer the clearest control flow available, and do not keep avoidable `goto` when a simpler structure would read better. Before introducing new file, process, allocation, locking, networking, or platform APIs, inspect nearby code and project contribution docs for existing helpers or compatibility wrappers and use those local patterns unless you can explain why they do not fit. Validate from a reproducible workspace-root entrypoint before falling back to focused leaf commands; if a build or test cannot run, report the exact command, the exact blocker, and any narrower check you ran instead. During validation, also try one bounded independent reproduction of the collected failure signal when it is safe and cheap, such as a failing test, smoke command, perf/strace comparison, or before/after runtime check. Only use `reproduced` if that command or test actually reproduced the failure; otherwise keep `observed` and report the reproduction blocker. The final explanation must connect the observed issue evidence to the actual code change, not just paraphrase the diff. Write like a maintainer is going to read the patch mail cold: explain the bug in plain language, define subsystem-specific jargon the first time you need it, and make the causal story obvious. Explicitly classify evidence confidence as `reproduced`, `observed`, or `inferred`: `reproduced` means you reproduced the failure locally; `observed` means Fixer has direct crash/log/trace evidence but you did not independently reproduce it; `inferred` means the source patch is not pull-request-ready, so do not leave a source diff unless you first gather stronger observed/reproduced evidence; otherwise return a no-patch diagnosis/report. For any source-changing `observed` patch, say explicitly in `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. Security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior need reproduced evidence plus explicit security-impact analysis before leaving a source diff; otherwise return a no-patch diagnosis/report for human review. If you introduce non-obvious state translation, index remapping, or backend split logic, add a short source comment that explains the invariant being preserved.
Start by explaining the likely root cause from the collected perf, strace, and /proc evidence. If you cannot land a safe patch, leave a diagnosis that is strong enough for an upstream bug report.
Interpreter process expectation: when the hot process is Python, Perl, shell, Node, Ruby, PHP, Lua, or another interpreter, inspect both the runtime and the script/application entrypoint from `details.interpreter_process`. Prefer the script or application package when evidence points there; do not patch the interpreter runtime merely because the hot binary is `python`, `perl`, `bash`, or similar. Runtime fixes are welcome only after checking the entrypoint and explaining why the runtime mishandles the workload or why running bad code faster/safer is itself the right upstream fix.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Keep the change narrowly scoped and summarize validation clearly.
In every authoring pass, your final response must start with `Subject: <single-line git commit subject>` and then include these markdown sections exactly:
## Commit Message
A short upstream-friendly explanation of what changed and why. Write it in plain language that a maintainer can follow without local complaint context. If you use subsystem jargon, define it immediately.
## Evidence Confidence
Exactly one word: `reproduced`, `observed`, or `inferred`. Use `reproduced` only when you reproduced the failure locally with a command or test, and include that command/test in `## Validation`. Use `observed` when Fixer has direct crash/log/trace evidence but you did not independently reproduce it. If `## Git Add Paths` lists source files for an `observed` patch, `## Issue Connection` must explicitly say the failure was observed by Fixer and not independently reproduced. Security-sensitive source changes touching authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior require reproduced evidence and explicit security-impact analysis; otherwise list `None` under `## Git Add Paths` and write a no-patch diagnosis/report. Use `inferred` for profiler/strace/indirect evidence; inferred responses may be no-patch diagnoses or reports, but inferred source patches are not pull-request-ready until stronger evidence is gathered.
## Issue Connection
Write this as maintainer-facing patch mail, not as local Fixer notes. Cover four things explicitly in readable sentences: the user-visible symptom or the exact collected signal, the code-level cause or the cautious inference from evidence, the specific change you made, and the expected effect. Do not invent a reproducer, command line, crash, or user-visible failure that is not present in the evidence bundle. If the evidence is direct-but-not-reproduced, say it was observed by Fixer and not independently reproduced. If the evidence is indirect and you did not gather stronger evidence, do not leave a source diff; write a no-patch diagnosis/report instead. Include an explicit effect sentence such as `The expected effect is ...`, `This should reduce ...`, or `This prevents ...` for source patches. If the logic is non-obvious in code, mention that you added a short explanatory comment.
## Git Add Paths
List the repo-relative paths that belong in the final patch, one per line. Use `None` only when you intentionally made no source changes. Include intentionally new files, and do not list generated build artifacts.
## Validation
List the checks you ran, or say clearly that you could not run them. Include the independent reproduction command/test and result when `## Evidence Confidence` is `reproduced`; if reproduction was attempted but blocked, name the exact blocker and keep confidence at `observed` or `inferred`.
Before editing, read the plan at `./plan-output.txt` and follow it unless the code proves part of it wrong. If you change course, say so explicitly in the final write-up instead of silently drifting from the plan.
## Review Pass 1
You are reviewing a freshly generated fixer patch.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Review the first patch pass. The original pre-edit snapshot is available at `./source` for diffing.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout. The latest author response is at `./patch-output.txt`. Inspect the current code and changed paths like a strict code reviewer. Focus on correctness, regressions, maintainability, awkward control flow such as avoidable `goto`, missing validation, weak or non-gittable commit message text, and explanations that fail to connect the observed issue evidence to the code change. Also review the maintainer experience: the patch mail should be easy to accept upstream, the user-visible bug should be explained in plain language, subsystem-specific jargon should be defined when first used, and any non-obvious state translation or index remapping in code should have a short explanatory comment. Reject patches that omit `## Evidence Confidence`, use anything other than `reproduced`, `observed`, or `inferred`, or sound more certain than that evidence level allows. Reject patches that claim `reproduced` unless `## Validation` names the concrete reproduction command or test and its result. Reject source patches in security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior unless the author reproduced the behavior and explicitly analyzed the security impact of the change; observed-only evidence should become a diagnosis/report, not a PR-ready source diff. Reject patches that invent a reproducer, command line, crash, or user-visible failure not present in the evidence bundle; indirect profiler or strace evidence may justify a cautious mitigation, but the author must say it is indirect instead of presenting it as a confirmed upstream bug. Reject patches that introduce generic libc/std APIs when nearby code or project docs provide a local compat/helper API for the same job, unless the author explicitly justifies the exception. Reject validation that only reports a leaf object/syntax build when a project-level configure/build/test entrypoint exists and was not attempted; if a full build cannot run, the author must show the exact failed command and blocker.
Do not apply code changes in this pass.
Return a short markdown review report. The first non-empty line must be exactly one of:
RESULT: ok
RESULT: fix-needed
If you choose `RESULT: fix-needed`, add a `## Findings` section with concrete, actionable items.## Plan Pass
## Problem
Fixer observed `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` repeatedly in `pselect6`, but the retained trace shows 1.8-2.0 second timeouts, process state `S (sleeping)`, and only ~0.9% CPU. That does not support a confirmed runaway CPU bug in `munin-node`.
## Evidence Confidence
inferred
## Proposed Subject
No source patch: report this as an idle `munin-node`/`Net::Server::Fork` accept loop misclassified as busy polling unless a bounded reproduction shows CPU burn or zero/near-zero timeout polling.
## Patch Plan
Do not edit files in this pass. The evidence lacks a Perl-level stack and the observed `pselect6(..., timeout ~= 2s)` matches `Net::Server::Fork`’s accept loop using `IO::Select->can_read(2)`, not a tight loop in `script/munin-node`.
Relevant local conventions found: `CONTRIBUTING.md` points to `HACKING.pod`; new Perl should use `strict`, `warnings`, taint-compatible style, `English`, and existing helpers. Local helpers inspected include `Munin::Common::Timeout::do_with_timeout`, `Munin::Node::OS::run_as_child`, and `Munin::Common::Daemon::emit_sd_notify_message`; no relevant local helper was found for replacing the upstream `Net::Server::Fork` socket wait.
No prior Fixer patch was found to improve or replace. No awkward control-flow change such as `goto` should be introduced.
## Risks
Patching `munin-node` based on this evidence would likely add behavior churn without fixing a demonstrated bug. Changing the server wait loop could regress signal handling, foreground/systemd readiness, connection acceptance, or child cleanup in `Net::Server::Fork`.
## Validation
From the workspace root, try project-level validation first: `make`. There is no `check` target in the inspected `Makefile`; use `make test` after `make`.
Bounded independent signal check, only after build-generated files exist: run `munin-node` in foreground under a short `strace`/`timeout` and confirm whether waits are blocking around 2 seconds rather than spinning, e.g. trace `pselect6,select,poll,ppoll` and sample `ps -o stat,pcpu,wchan,args`. Do not claim reproduced unless that command shows the alleged tight loop.
## Patch Pass
Subject: Diagnose munin-node idle poll evidence
## Commit Message
No source change. The collected signal looks like an idle `munin-node` listener waiting in `Net::Server::Fork`, not a confirmed busy loop. The retained `/proc` data shows the process sleeping, and the `strace` excerpt shows `pselect6` calls blocking for about two seconds.
## Evidence Confidence
inferred
## Issue Connection
The collected signal was `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` sampled in a poll-family syscall path, with `pselect6` appearing repeatedly. The important detail is that the saved `strace` lines show timeouts of about 1.8 to 2.0 seconds, while `/proc` reports state `S (sleeping)`, wait channel `poll_schedule_timeout.constprop.0`, and only about 0.9% CPU.
The likely root cause is a profiler classification false positive: `munin-node` uses `Munin::Node::Server`, which subclasses `Net::Server::Fork`; the installed `Net::Server::Fork` accept path waits with `IO::Select->can_read(2)`. That matches the observed two-second `pselect6` waits and does not show a tight polling loop. I also checked the Perl entrypoint before considering the Perl runtime; the evidence does not show Perl runtime mishandling.
I followed the saved plan and did not leave a source diff. `CONTRIBUTING.md` points to `HACKING.pod`; relevant local helpers inspected include `Munin::Common::Timeout::do_with_timeout`, `Munin::Node::OS::run_as_child`, and `Munin::Common::Daemon::emit_sd_notify_message`. No relevant local helper was found for replacing the upstream `Net::Server::Fork` socket wait, and changing that path would be speculative.
The expected effect is no upstream patch until stronger evidence ties a real CPU spin to Munin code, such as a Perl-level stack or syscall trace showing near-zero timeout polling.
## Git Add Paths
None
## Validation
`make` from the workspace root failed before building because `Module::Build` is missing:
```text
Can't locate Module/Build.pm in @INC ... at Build.PL line 80.
make: *** [Makefile:149: Build] Error 2
```
`make check` is not available in the inspected `Makefile`.
Narrow checks run after the project build blocker:
```text
perl -c lib/Munin/Common/Timeout.pm
lib/Munin/Common/Timeout.pm syntax OK
perl -c lib/Munin/Node/OS.pm
lib/Munin/Node/OS.pm syntax OK
perl -c -Ilib lib/Munin/Node/Server.pm
lib/Munin/Node/Server.pm syntax OK
perl -T -c -Ilib script/munin-node
script/munin-node syntax OK
```
Independent reproduction was attempted but blocked. `strace` failed with `PTRACE_TRACEME: Operation not permitted` and `ptrace(PTRACE_SEIZE, 5): Operation not permitted`. A no-ptrace `Net::Server::Fork` smoke server also could not bind a loopback TCP port in this sandbox: `Cannot bind and listen to TCP port 14949 on 127.0.0.1 [Operation not permitted]`. Therefore I did not reproduce the failure locally.
## Review Pass 1
RESULT: ok
No source changes are present in the workspace, and the author response correctly treats the evidence as `inferred` rather than leaving a speculative source patch.
The diagnosis is consistent with the bundle: the collected `/proc` state is sleeping, the wait channel is `poll_schedule_timeout`, CPU was low, and the retained `pselect6` calls block for about two seconds. The response also connects that signal to the inspected `munin-node`/`Net::Server::Fork` accept path and avoids claiming an independently reproduced bug.
Validation is acceptable for a no-patch diagnosis: `make` was attempted first and blocked by missing `Module::Build`, focused Perl syntax checks were run, and the bounded reproduction attempts were reported as blocked by sandbox ptrace and bind restrictions.perl likely remains stuck in a busy-poll loop. A diagnosis report and patch proposal were created locally.
## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.
## Patch Pass
You are working on a bounded fixer proposal.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Produce the smallest reasonable patch for the target repository, keep the change upstreamable, prefer the clearest control flow available, and do not keep avoidable `goto` when a simpler structure would read better. Before introducing new file, process, allocation, locking, networking, or platform APIs, inspect nearby code and project contribution docs for existing helpers or compatibility wrappers and use those local patterns unless you can explain why they do not fit. Validate from a reproducible workspace-root entrypoint before falling back to focused leaf commands; if a build or test cannot run, report the exact command, the exact blocker, and any narrower check you ran instead. During validation, also try one bounded independent reproduction of the collected failure signal when it is safe and cheap, such as a failing test, smoke command, perf/strace comparison, or before/after runtime check. Only use `reproduced` if that command or test actually reproduced the failure; otherwise keep `observed` and report the reproduction blocker. The final explanation must connect the observed issue evidence to the actual code change, not just paraphrase the diff. Write like a maintainer is going to read the patch mail cold: explain the bug in plain language, define subsystem-specific jargon the first time you need it, and make the causal story obvious. Explicitly classify evidence confidence as `reproduced`, `observed`, or `inferred`: `reproduced` means you reproduced the failure locally; `observed` means Fixer has direct crash/log/trace evidence but you did not independently reproduce it; `inferred` means the source patch is not pull-request-ready, so do not leave a source diff unless you first gather stronger observed/reproduced evidence; otherwise return a no-patch diagnosis/report. For any source-changing `observed` patch, say explicitly in `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. Security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior need reproduced evidence plus explicit security-impact analysis before leaving a source diff; otherwise return a no-patch diagnosis/report for human review. If you introduce non-obvious state translation, index remapping, or backend split logic, add a short source comment that explains the invariant being preserved.
Start by explaining the likely root cause from the collected perf, strace, and /proc evidence. If you cannot land a safe patch, leave a diagnosis that is strong enough for an upstream bug report.
Interpreter process expectation: when the hot process is Python, Perl, shell, Node, Ruby, PHP, Lua, or another interpreter, inspect both the runtime and the script/application entrypoint from `details.interpreter_process`. Prefer the script or application package when evidence points there; do not patch the interpreter runtime merely because the hot binary is `python`, `perl`, `bash`, or similar. Runtime fixes are welcome only after checking the entrypoint and explaining why the runtime mishandles the workload or why running bad code faster/safer is itself the right upstream fix.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Keep the change narrowly scoped and summarize validation clearly.
In every authoring pass, your final response must start with `Subject: <single-line git commit subject>` and then include these markdown sections exactly:
## Commit Message
A short upstream-friendly explanation of what changed and why. Write it in plain language that a maintainer can follow without local complaint context. If you use subsystem jargon, define it immediately.
## Evidence Confidence
Exactly one word: `reproduced`, `observed`, or `inferred`. Use `reproduced` only when you reproduced the failure locally with a command or test, and include that command/test in `## Validation`. Use `observed` when Fixer has direct crash/log/trace evidence but you did not independently reproduce it. If `## Git Add Paths` lists source files for an `observed` patch, `## Issue Connection` must explicitly say the failure was observed by Fixer and not independently reproduced. Security-sensitive source changes touching authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior require reproduced evidence and explicit security-impact analysis; otherwise list `None` under `## Git Add Paths` and write a no-patch diagnosis/report. Use `inferred` for profiler/strace/indirect evidence; inferred responses may be no-patch diagnoses or reports, but inferred source patches are not pull-request-ready until stronger evidence is gathered.
## Issue Connection
Write this as maintainer-facing patch mail, not as local Fixer notes. Cover four things explicitly in readable sentences: the user-visible symptom or the exact collected signal, the code-level cause or the cautious inference from evidence, the specific change you made, and the expected effect. Do not invent a reproducer, command line, crash, or user-visible failure that is not present in the evidence bundle. If the evidence is direct-but-not-reproduced, say it was observed by Fixer and not independently reproduced. If the evidence is indirect and you did not gather stronger evidence, do not leave a source diff; write a no-patch diagnosis/report instead. Include an explicit effect sentence such as `The expected effect is ...`, `This should reduce ...`, or `This prevents ...` for source patches. If the logic is non-obvious in code, mention that you added a short explanatory comment.
## Git Add Paths
List the repo-relative paths that belong in the final patch, one per line. Use `None` only when you intentionally made no source changes. Include intentionally new files, and do not list generated build artifacts.
## Validation
List the checks you ran, or say clearly that you could not run them. Include the independent reproduction command/test and result when `## Evidence Confidence` is `reproduced`; if reproduction was attempted but blocked, name the exact blocker and keep confidence at `observed` or `inferred`.
Before editing, read the plan at `./plan-output.txt` and follow it unless the code proves part of it wrong. If you change course, say so explicitly in the final write-up instead of silently drifting from the plan.
## Review Pass 1
You are reviewing a freshly generated fixer patch.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Review the first patch pass. The original pre-edit snapshot is available at `./source` for diffing.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout. The latest author response is at `./patch-output.txt`. Inspect the current code and changed paths like a strict code reviewer. Focus on correctness, regressions, maintainability, awkward control flow such as avoidable `goto`, missing validation, weak or non-gittable commit message text, and explanations that fail to connect the observed issue evidence to the code change. Also review the maintainer experience: the patch mail should be easy to accept upstream, the user-visible bug should be explained in plain language, subsystem-specific jargon should be defined when first used, and any non-obvious state translation or index remapping in code should have a short explanatory comment. Reject patches that omit `## Evidence Confidence`, use anything other than `reproduced`, `observed`, or `inferred`, or sound more certain than that evidence level allows. Reject patches that claim `reproduced` unless `## Validation` names the concrete reproduction command or test and its result. Reject source patches in security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior unless the author reproduced the behavior and explicitly analyzed the security impact of the change; observed-only evidence should become a diagnosis/report, not a PR-ready source diff. Reject patches that invent a reproducer, command line, crash, or user-visible failure not present in the evidence bundle; indirect profiler or strace evidence may justify a cautious mitigation, but the author must say it is indirect instead of presenting it as a confirmed upstream bug. Reject patches that introduce generic libc/std APIs when nearby code or project docs provide a local compat/helper API for the same job, unless the author explicitly justifies the exception. Reject validation that only reports a leaf object/syntax build when a project-level configure/build/test entrypoint exists and was not attempted; if a full build cannot run, the author must show the exact failed command and blocker.
Do not apply code changes in this pass.
Return a short markdown review report. The first non-empty line must be exactly one of:
RESULT: ok
RESULT: fix-needed
If you choose `RESULT: fix-needed`, add a `## Findings` section with concrete, actionable items.## Plan Pass
## Problem
Fixer observed `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` repeatedly in `pselect6`, but the retained trace shows 1.8-2.0 second timeouts, process state `S (sleeping)`, and only ~0.9% CPU. That does not support a confirmed runaway CPU bug in `munin-node`.
## Evidence Confidence
inferred
## Proposed Subject
No source patch: report this as an idle `munin-node`/`Net::Server::Fork` accept loop misclassified as busy polling unless a bounded reproduction shows CPU burn or zero/near-zero timeout polling.
## Patch Plan
Do not edit files in this pass. The evidence lacks a Perl-level stack and the observed `pselect6(..., timeout ~= 2s)` matches `Net::Server::Fork`’s accept loop using `IO::Select->can_read(2)`, not a tight loop in `script/munin-node`.
Relevant local conventions found: `CONTRIBUTING.md` points to `HACKING.pod`; new Perl should use `strict`, `warnings`, taint-compatible style, `English`, and existing helpers. Local helpers inspected include `Munin::Common::Timeout::do_with_timeout`, `Munin::Node::OS::run_as_child`, and `Munin::Common::Daemon::emit_sd_notify_message`; no relevant local helper was found for replacing the upstream `Net::Server::Fork` socket wait.
No prior Fixer patch was found to improve or replace. No awkward control-flow change such as `goto` should be introduced.
## Risks
Patching `munin-node` based on this evidence would likely add behavior churn without fixing a demonstrated bug. Changing the server wait loop could regress signal handling, foreground/systemd readiness, connection acceptance, or child cleanup in `Net::Server::Fork`.
## Validation
From the workspace root, try project-level validation first: `make`. There is no `check` target in the inspected `Makefile`; use `make test` after `make`.
Bounded independent signal check, only after build-generated files exist: run `munin-node` in foreground under a short `strace`/`timeout` and confirm whether waits are blocking around 2 seconds rather than spinning, e.g. trace `pselect6,select,poll,ppoll` and sample `ps -o stat,pcpu,wchan,args`. Do not claim reproduced unless that command shows the alleged tight loop.
## Patch Pass
Subject: Diagnose munin-node idle poll evidence
## Commit Message
No source change. The collected signal looks like an idle `munin-node` listener waiting in `Net::Server::Fork`, not a confirmed busy loop. The retained `/proc` data shows the process sleeping, and the `strace` excerpt shows `pselect6` calls blocking for about two seconds.
## Evidence Confidence
inferred
## Issue Connection
The collected signal was `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` sampled in a poll-family syscall path, with `pselect6` appearing repeatedly. The important detail is that the saved `strace` lines show timeouts of about 1.8 to 2.0 seconds, while `/proc` reports state `S (sleeping)`, wait channel `poll_schedule_timeout.constprop.0`, and only about 0.9% CPU.
The likely root cause is a profiler classification false positive: `munin-node` uses `Munin::Node::Server`, which subclasses `Net::Server::Fork`; the installed `Net::Server::Fork` accept path waits with `IO::Select->can_read(2)`. That matches the observed two-second `pselect6` waits and does not show a tight polling loop. I also checked the Perl entrypoint before considering the Perl runtime; the evidence does not show Perl runtime mishandling.
I followed the saved plan and did not leave a source diff. `CONTRIBUTING.md` points to `HACKING.pod`; relevant local helpers inspected include `Munin::Common::Timeout::do_with_timeout`, `Munin::Node::OS::run_as_child`, and `Munin::Common::Daemon::emit_sd_notify_message`. No relevant local helper was found for replacing the upstream `Net::Server::Fork` socket wait, and changing that path would be speculative.
The expected effect is no upstream patch until stronger evidence ties a real CPU spin to Munin code, such as a Perl-level stack or syscall trace showing near-zero timeout polling.
## Git Add Paths
None
## Validation
`make` from the workspace root failed before building because `Module::Build` is missing:
```text
Can't locate Module/Build.pm in @INC ... at Build.PL line 80.
make: *** [Makefile:149: Build] Error 2
```
`make check` is not available in the inspected `Makefile`.
Narrow checks run after the project build blocker:
```text
perl -c lib/Munin/Common/Timeout.pm
lib/Munin/Common/Timeout.pm syntax OK
perl -c lib/Munin/Node/OS.pm
lib/Munin/Node/OS.pm syntax OK
perl -c -Ilib lib/Munin/Node/Server.pm
lib/Munin/Node/Server.pm syntax OK
perl -T -c -Ilib script/munin-node
script/munin-node syntax OK
```
Independent reproduction was attempted but blocked. `strace` failed with `PTRACE_TRACEME: Operation not permitted` and `ptrace(PTRACE_SEIZE, 5): Operation not permitted`. A no-ptrace `Net::Server::Fork` smoke server also could not bind a loopback TCP port in this sandbox: `Cannot bind and listen to TCP port 14949 on 127.0.0.1 [Operation not permitted]`. Therefore I did not reproduce the failure locally.
## Review Pass 1
RESULT: ok
No source changes are present in the workspace, and the author response correctly treats the evidence as `inferred` rather than leaving a speculative source patch.
The diagnosis is consistent with the bundle: the collected `/proc` state is sleeping, the wait channel is `poll_schedule_timeout`, CPU was low, and the retained `pselect6` calls block for about two seconds. The response also connects that signal to the inspected `munin-node`/`Net::Server::Fork` accept path and avoids claiming an independently reproduced bug.
Validation is acceptable for a no-patch diagnosis: `make` was attempted first and blocked by missing `Module::Build`, focused Perl syntax checks were run, and the bounded reproduction attempts were reported as blocked by sandbox ptrace and bind restrictions.perl likely remains stuck in a busy-poll loop. A diagnosis report and patch proposal were created locally.
## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.
## Patch Pass
You are working on a bounded fixer proposal.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Produce the smallest reasonable patch for the target repository, keep the change upstreamable, prefer the clearest control flow available, and do not keep avoidable `goto` when a simpler structure would read better. Before introducing new file, process, allocation, locking, networking, or platform APIs, inspect nearby code and project contribution docs for existing helpers or compatibility wrappers and use those local patterns unless you can explain why they do not fit. Validate from a reproducible workspace-root entrypoint before falling back to focused leaf commands; if a build or test cannot run, report the exact command, the exact blocker, and any narrower check you ran instead. During validation, also try one bounded independent reproduction of the collected failure signal when it is safe and cheap, such as a failing test, smoke command, perf/strace comparison, or before/after runtime check. Only use `reproduced` if that command or test actually reproduced the failure; otherwise keep `observed` and report the reproduction blocker. The final explanation must connect the observed issue evidence to the actual code change, not just paraphrase the diff. Write like a maintainer is going to read the patch mail cold: explain the bug in plain language, define subsystem-specific jargon the first time you need it, and make the causal story obvious. Explicitly classify evidence confidence as `reproduced`, `observed`, or `inferred`: `reproduced` means you reproduced the failure locally; `observed` means Fixer has direct crash/log/trace evidence but you did not independently reproduce it; `inferred` means the source patch is not pull-request-ready, so do not leave a source diff unless you first gather stronger observed/reproduced evidence; otherwise return a no-patch diagnosis/report. For any source-changing `observed` patch, say explicitly in `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. Security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior need reproduced evidence plus explicit security-impact analysis before leaving a source diff; otherwise return a no-patch diagnosis/report for human review. If you introduce non-obvious state translation, index remapping, or backend split logic, add a short source comment that explains the invariant being preserved.
Start by explaining the likely root cause from the collected perf, strace, and /proc evidence. If you cannot land a safe patch, leave a diagnosis that is strong enough for an upstream bug report.
Interpreter process expectation: when the hot process is Python, Perl, shell, Node, Ruby, PHP, Lua, or another interpreter, inspect both the runtime and the script/application entrypoint from `details.interpreter_process`. Prefer the script or application package when evidence points there; do not patch the interpreter runtime merely because the hot binary is `python`, `perl`, `bash`, or similar. Runtime fixes are welcome only after checking the entrypoint and explaining why the runtime mishandles the workload or why running bad code faster/safer is itself the right upstream fix.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Keep the change narrowly scoped and summarize validation clearly.
In every authoring pass, your final response must start with `Subject: <single-line git commit subject>` and then include these markdown sections exactly:
## Commit Message
A short upstream-friendly explanation of what changed and why. Write it in plain language that a maintainer can follow without local complaint context. If you use subsystem jargon, define it immediately.
## Evidence Confidence
Exactly one word: `reproduced`, `observed`, or `inferred`. Use `reproduced` only when you reproduced the failure locally with a command or test, and include that command/test in `## Validation`. Use `observed` when Fixer has direct crash/log/trace evidence but you did not independently reproduce it. If `## Git Add Paths` lists source files for an `observed` patch, `## Issue Connection` must explicitly say the failure was observed by Fixer and not independently reproduced. Security-sensitive source changes touching authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior require reproduced evidence and explicit security-impact analysis; otherwise list `None` under `## Git Add Paths` and write a no-patch diagnosis/report. Use `inferred` for profiler/strace/indirect evidence; inferred responses may be no-patch diagnoses or reports, but inferred source patches are not pull-request-ready until stronger evidence is gathered.
## Issue Connection
Write this as maintainer-facing patch mail, not as local Fixer notes. Cover four things explicitly in readable sentences: the user-visible symptom or the exact collected signal, the code-level cause or the cautious inference from evidence, the specific change you made, and the expected effect. Do not invent a reproducer, command line, crash, or user-visible failure that is not present in the evidence bundle. If the evidence is direct-but-not-reproduced, say it was observed by Fixer and not independently reproduced. If the evidence is indirect and you did not gather stronger evidence, do not leave a source diff; write a no-patch diagnosis/report instead. Include an explicit effect sentence such as `The expected effect is ...`, `This should reduce ...`, or `This prevents ...` for source patches. If the logic is non-obvious in code, mention that you added a short explanatory comment.
## Git Add Paths
List the repo-relative paths that belong in the final patch, one per line. Use `None` only when you intentionally made no source changes. Include intentionally new files, and do not list generated build artifacts.
## Validation
List the checks you ran, or say clearly that you could not run them. Include the independent reproduction command/test and result when `## Evidence Confidence` is `reproduced`; if reproduction was attempted but blocked, name the exact blocker and keep confidence at `observed` or `inferred`.
Before editing, read the plan at `./plan-output.txt` and follow it unless the code proves part of it wrong. If you change course, say so explicitly in the final write-up instead of silently drifting from the plan.
## Review Pass 1
You are reviewing a freshly generated fixer patch.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Review the first patch pass. The original pre-edit snapshot is available at `./source` for diffing.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout. The latest author response is at `./patch-output.txt`. Inspect the current code and changed paths like a strict code reviewer. Focus on correctness, regressions, maintainability, awkward control flow such as avoidable `goto`, missing validation, weak or non-gittable commit message text, and explanations that fail to connect the observed issue evidence to the code change. Also review the maintainer experience: the patch mail should be easy to accept upstream, the user-visible bug should be explained in plain language, subsystem-specific jargon should be defined when first used, and any non-obvious state translation or index remapping in code should have a short explanatory comment. Reject patches that omit `## Evidence Confidence`, use anything other than `reproduced`, `observed`, or `inferred`, or sound more certain than that evidence level allows. Reject patches that claim `reproduced` unless `## Validation` names the concrete reproduction command or test and its result. Reject source patches in security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior unless the author reproduced the behavior and explicitly analyzed the security impact of the change; observed-only evidence should become a diagnosis/report, not a PR-ready source diff. Reject patches that invent a reproducer, command line, crash, or user-visible failure not present in the evidence bundle; indirect profiler or strace evidence may justify a cautious mitigation, but the author must say it is indirect instead of presenting it as a confirmed upstream bug. Reject patches that introduce generic libc/std APIs when nearby code or project docs provide a local compat/helper API for the same job, unless the author explicitly justifies the exception. Reject validation that only reports a leaf object/syntax build when a project-level configure/build/test entrypoint exists and was not attempted; if a full build cannot run, the author must show the exact failed command and blocker.
Do not apply code changes in this pass.
Return a short markdown review report. The first non-empty line must be exactly one of:
RESULT: ok
RESULT: fix-needed
If you choose `RESULT: fix-needed`, add a `## Findings` section with concrete, actionable items.## Plan Pass
## Problem
Fixer flagged `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` as a likely busy poll loop, but the retained evidence shows `munin-node` sleeping in `pselect6` with ~1.8-2.0 second timeouts and only 0.9% CPU. That does not yet justify a Munin source patch.
## Evidence Confidence
inferred
## Proposed Subject
No source patch yet: reclassify the report as an unconfirmed `munin-node` idle event-loop observation unless a bounded reproduction shows sustained CPU and rapid poll wakeups.
## Patch Plan
Do not edit files in this pass. Improve or replace the prior Fixer diagnosis/report, which currently overstates “stuck” despite the strace showing blocking waits.
If a later reproduction proves a real tight loop, investigate `script/munin-node` first, then `lib/Munin/Node/Server.pm`, because the evidence identifies the script entrypoint and Net::Server-based daemon loop rather than a Perl runtime bug. Follow Munin style from `CONTRIBUTING.md` and `HACKING.pod`: `strict`, `warnings`, taint-compatible Perl, English variable names, file-local style. Relevant local helpers/conventions found: `Munin::Common::Daemon::emit_sd_notify_message`, `Munin::Common::Timeout::do_with_timeout`, `Munin::Node::OS->run_as_child`, and existing `Net::Server::Fork` hooks. No avoidable `goto` should be introduced; use bounded conditionals/returns.
## Risks
A source patch based only on current evidence would likely change normal daemon idle behavior. The observed `pselect6` waits may be Net::Server’s expected accept-loop timeout, not runaway CPU. No authentication, authorization, TLS, permissions, or throttling behavior should be changed without stronger reproduction and security impact analysis.
## Validation
Before any focused check, try the project-level entrypoint from the workspace root: `make`. The Makefile exposes `make test`; I found no `check` target, so use `make test` after `make` rather than claiming `make check`.
Bounded independent reproduction attempt before editing: run `munin-node` from the workspace with a temporary/minimal config under `timeout`, sample CPU with `ps`, and trace poll syscalls with `strace -ttT -f -e trace=pselect6,select,poll,ppoll,epoll_wait,nanosleep,clock_nanosleep`. Only treat it as reproduced if it shows sustained CPU plus rapid, non-blocking poll returns. For a narrow non-runtime sanity check after build, use `perl -Ilib -c script/munin-node` if project-level validation cannot run because dependencies or generated files are missing.
## Patch Pass
Subject: Diagnose munin-node idle select evidence without patch
## Commit Message
No source change is proposed. The collected evidence points to `munin-node` sitting in its Net::Server accept loop, not to a proven busy loop: `/proc` reported the process sleeping, `strace` showed multi-second `pselect6` timeouts, and CPU was under 1%.
## Evidence Confidence
inferred
## Issue Connection
Fixer collected a perf/backtrace/strace signal for `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` and classified it as a likely busy poll loop. The retained trace does not show rapid polling: it shows `pselect6` calls blocking for about 1.8-2.0 seconds, with `/proc` state `S (sleeping)`, wait channel `poll_schedule_timeout.constprop.0`, and max CPU 0.9%.
The cautious code-level inference is that Fixer sampled the normal `munin-node` daemon accept loop, implemented through `Net::Server::Fork` in `lib/Munin/Node/Server.pm`, rather than a confirmed Munin or Perl runaway. I inspected the Perl entrypoint first (`script/munin-node`) and then the node server code, per the interpreter-process evidence. I also checked `CONTRIBUTING.md` and `HACKING.pod`; relevant local conventions/helpers include taint-compatible Perl with `strict`/`warnings`, `Munin::Common::Daemon::emit_sd_notify_message`, `Munin::Common::Timeout::do_with_timeout`, `Munin::Node::OS->run_as_child`, and the existing `Net::Server::Fork` hooks.
No source change was made because the evidence remains indirect and the bounded local reproduction was blocked before an idle loop could be observed. The expected effect is to avoid sending upstream a speculative behavioral change for normal daemon waiting behavior.
## Git Add Paths
None
## Validation
`make` from the workspace root failed:
`Can't locate Module/Build.pm in @INC ... at Build.PL line 80`, followed by `make: *** [Makefile:149: Build] Error 2`.
`make check` failed because this Makefile has no `check` target:
`make: *** No rule to make target 'check'. Stop.`
`make test` failed at the same build prerequisite:
`Can't locate Module/Build.pm in @INC ... at Build.PL line 80`.
Focused checks:
`perl -T -Ilib -c script/munin-node` passed with `script/munin-node syntax OK`.
`perl -Ilib -c lib/Munin/Node/Server.pm` passed with `lib/Munin/Node/Server.pm syntax OK`.
Independent reproduction attempts:
`strace -f -ttT ... perl -T -Ilib script/munin-node ...` was blocked by the sandbox: `PTRACE_TRACEME: Operation not permitted`.
A bounded `munin-node` smoke run with an absolute temporary config and high port failed before the event loop: `Cannot bind and listen to TCP port 54949 on 127.0.0.1 [Operation not permitted]`. No local command reproduced sustained CPU or rapid non-blocking poll returns.
## Review Pass 1
RESULT: ok
No source diff is present, and that matches the evidence level. The author correctly treated the profiler/strace signal as indirect, used `## Evidence Confidence` = `inferred`, listed `None` under `## Git Add Paths`, and avoided a speculative source patch.
Validation is acceptable for a no-patch diagnosis: project-level `make`, `make check`, and `make test` were attempted with exact blockers, then focused Perl syntax checks and bounded reproduction attempts were reported. The explanation also ties the evidence to the likely `Net::Server::Fork` idle accept loop and names the relevant Munin style docs and local helpers.perl likely remains stuck in a busy-poll loop. A diagnosis report and patch proposal were created locally.
## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.
## Patch Pass
You are working on a bounded fixer proposal.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Produce the smallest reasonable patch for the target repository, keep the change upstreamable, prefer the clearest control flow available, and do not keep avoidable `goto` when a simpler structure would read better. Before introducing new file, process, allocation, locking, networking, or platform APIs, inspect nearby code and project contribution docs for existing helpers or compatibility wrappers and use those local patterns unless you can explain why they do not fit. Validate from a reproducible workspace-root entrypoint before falling back to focused leaf commands; if a build or test cannot run, report the exact command, the exact blocker, and any narrower check you ran instead. During validation, also try one bounded independent reproduction of the collected failure signal when it is safe and cheap, such as a failing test, smoke command, perf/strace comparison, or before/after runtime check. Only use `reproduced` if that command or test actually reproduced the failure; otherwise keep `observed` and report the reproduction blocker. The final explanation must connect the observed issue evidence to the actual code change, not just paraphrase the diff. Write like a maintainer is going to read the patch mail cold: explain the bug in plain language, define subsystem-specific jargon the first time you need it, and make the causal story obvious. Explicitly classify evidence confidence as `reproduced`, `observed`, or `inferred`: `reproduced` means you reproduced the failure locally; `observed` means Fixer has direct crash/log/trace evidence but you did not independently reproduce it; `inferred` means the source patch is not pull-request-ready, so do not leave a source diff unless you first gather stronger observed/reproduced evidence; otherwise return a no-patch diagnosis/report. For any source-changing `observed` patch, say explicitly in `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. Security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior need reproduced evidence plus explicit security-impact analysis before leaving a source diff; otherwise return a no-patch diagnosis/report for human review. If you introduce non-obvious state translation, index remapping, or backend split logic, add a short source comment that explains the invariant being preserved.
Start by explaining the likely root cause from the collected perf, strace, and /proc evidence. If you cannot land a safe patch, leave a diagnosis that is strong enough for an upstream bug report.
Interpreter process expectation: when the hot process is Python, Perl, shell, Node, Ruby, PHP, Lua, or another interpreter, inspect both the runtime and the script/application entrypoint from `details.interpreter_process`. Prefer the script or application package when evidence points there; do not patch the interpreter runtime merely because the hot binary is `python`, `perl`, `bash`, or similar. Runtime fixes are welcome only after checking the entrypoint and explaining why the runtime mishandles the workload or why running bad code faster/safer is itself the right upstream fix.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Keep the change narrowly scoped and summarize validation clearly.
In every authoring pass, your final response must start with `Subject: <single-line git commit subject>` and then include these markdown sections exactly:
## Commit Message
A short upstream-friendly explanation of what changed and why. Write it in plain language that a maintainer can follow without local complaint context. If you use subsystem jargon, define it immediately.
## Evidence Confidence
Exactly one word: `reproduced`, `observed`, or `inferred`. Use `reproduced` only when you reproduced the failure locally with a command or test, and include that command/test in `## Validation`. Use `observed` when Fixer has direct crash/log/trace evidence but you did not independently reproduce it. If `## Git Add Paths` lists source files for an `observed` patch, `## Issue Connection` must explicitly say the failure was observed by Fixer and not independently reproduced. Security-sensitive source changes touching authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior require reproduced evidence and explicit security-impact analysis; otherwise list `None` under `## Git Add Paths` and write a no-patch diagnosis/report. Use `inferred` for profiler/strace/indirect evidence; inferred responses may be no-patch diagnoses or reports, but inferred source patches are not pull-request-ready until stronger evidence is gathered.
## Issue Connection
Write this as maintainer-facing patch mail, not as local Fixer notes. Cover four things explicitly in readable sentences: the user-visible symptom or the exact collected signal, the code-level cause or the cautious inference from evidence, the specific change you made, and the expected effect. Do not invent a reproducer, command line, crash, or user-visible failure that is not present in the evidence bundle. If the evidence is direct-but-not-reproduced, say it was observed by Fixer and not independently reproduced. If the evidence is indirect and you did not gather stronger evidence, do not leave a source diff; write a no-patch diagnosis/report instead. Include an explicit effect sentence such as `The expected effect is ...`, `This should reduce ...`, or `This prevents ...` for source patches. If the logic is non-obvious in code, mention that you added a short explanatory comment.
## Git Add Paths
List the repo-relative paths that belong in the final patch, one per line. Use `None` only when you intentionally made no source changes. Include intentionally new files, and do not list generated build artifacts.
## Validation
List the checks you ran, or say clearly that you could not run them. Include the independent reproduction command/test and result when `## Evidence Confidence` is `reproduced`; if reproduction was attempted but blocked, name the exact blocker and keep confidence at `observed` or `inferred`.
Before editing, read the plan at `./plan-output.txt` and follow it unless the code proves part of it wrong. If you change course, say so explicitly in the final write-up instead of silently drifting from the plan.
## Review Pass 1
You are reviewing a freshly generated fixer patch.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Review the first patch pass. The original pre-edit snapshot is available at `./source` for diffing.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout. The latest author response is at `./patch-output.txt`. Inspect the current code and changed paths like a strict code reviewer. Focus on correctness, regressions, maintainability, awkward control flow such as avoidable `goto`, missing validation, weak or non-gittable commit message text, and explanations that fail to connect the observed issue evidence to the code change. Also review the maintainer experience: the patch mail should be easy to accept upstream, the user-visible bug should be explained in plain language, subsystem-specific jargon should be defined when first used, and any non-obvious state translation or index remapping in code should have a short explanatory comment. Reject patches that omit `## Evidence Confidence`, use anything other than `reproduced`, `observed`, or `inferred`, or sound more certain than that evidence level allows. Reject patches that claim `reproduced` unless `## Validation` names the concrete reproduction command or test and its result. Reject source patches in security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior unless the author reproduced the behavior and explicitly analyzed the security impact of the change; observed-only evidence should become a diagnosis/report, not a PR-ready source diff. Reject patches that invent a reproducer, command line, crash, or user-visible failure not present in the evidence bundle; indirect profiler or strace evidence may justify a cautious mitigation, but the author must say it is indirect instead of presenting it as a confirmed upstream bug. Reject patches that introduce generic libc/std APIs when nearby code or project docs provide a local compat/helper API for the same job, unless the author explicitly justifies the exception. Reject validation that only reports a leaf object/syntax build when a project-level configure/build/test entrypoint exists and was not attempted; if a full build cannot run, the author must show the exact failed command and blocker.
Do not apply code changes in this pass.
Return a short markdown review report. The first non-empty line must be exactly one of:
RESULT: ok
RESULT: fix-needed
If you choose `RESULT: fix-needed`, add a `## Findings` section with concrete, actionable items.## Plan Pass
## Problem
Fixer flagged `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` as a likely busy poll loop, but the retained evidence shows `munin-node` sleeping in `pselect6` with ~1.8-2.0 second timeouts and only 0.9% CPU. That does not yet justify a Munin source patch.
## Evidence Confidence
inferred
## Proposed Subject
No source patch yet: reclassify the report as an unconfirmed `munin-node` idle event-loop observation unless a bounded reproduction shows sustained CPU and rapid poll wakeups.
## Patch Plan
Do not edit files in this pass. Improve or replace the prior Fixer diagnosis/report, which currently overstates “stuck” despite the strace showing blocking waits.
If a later reproduction proves a real tight loop, investigate `script/munin-node` first, then `lib/Munin/Node/Server.pm`, because the evidence identifies the script entrypoint and Net::Server-based daemon loop rather than a Perl runtime bug. Follow Munin style from `CONTRIBUTING.md` and `HACKING.pod`: `strict`, `warnings`, taint-compatible Perl, English variable names, file-local style. Relevant local helpers/conventions found: `Munin::Common::Daemon::emit_sd_notify_message`, `Munin::Common::Timeout::do_with_timeout`, `Munin::Node::OS->run_as_child`, and existing `Net::Server::Fork` hooks. No avoidable `goto` should be introduced; use bounded conditionals/returns.
## Risks
A source patch based only on current evidence would likely change normal daemon idle behavior. The observed `pselect6` waits may be Net::Server’s expected accept-loop timeout, not runaway CPU. No authentication, authorization, TLS, permissions, or throttling behavior should be changed without stronger reproduction and security impact analysis.
## Validation
Before any focused check, try the project-level entrypoint from the workspace root: `make`. The Makefile exposes `make test`; I found no `check` target, so use `make test` after `make` rather than claiming `make check`.
Bounded independent reproduction attempt before editing: run `munin-node` from the workspace with a temporary/minimal config under `timeout`, sample CPU with `ps`, and trace poll syscalls with `strace -ttT -f -e trace=pselect6,select,poll,ppoll,epoll_wait,nanosleep,clock_nanosleep`. Only treat it as reproduced if it shows sustained CPU plus rapid, non-blocking poll returns. For a narrow non-runtime sanity check after build, use `perl -Ilib -c script/munin-node` if project-level validation cannot run because dependencies or generated files are missing.
## Patch Pass
Subject: Diagnose munin-node idle select evidence without patch
## Commit Message
No source change is proposed. The collected evidence points to `munin-node` sitting in its Net::Server accept loop, not to a proven busy loop: `/proc` reported the process sleeping, `strace` showed multi-second `pselect6` timeouts, and CPU was under 1%.
## Evidence Confidence
inferred
## Issue Connection
Fixer collected a perf/backtrace/strace signal for `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` and classified it as a likely busy poll loop. The retained trace does not show rapid polling: it shows `pselect6` calls blocking for about 1.8-2.0 seconds, with `/proc` state `S (sleeping)`, wait channel `poll_schedule_timeout.constprop.0`, and max CPU 0.9%.
The cautious code-level inference is that Fixer sampled the normal `munin-node` daemon accept loop, implemented through `Net::Server::Fork` in `lib/Munin/Node/Server.pm`, rather than a confirmed Munin or Perl runaway. I inspected the Perl entrypoint first (`script/munin-node`) and then the node server code, per the interpreter-process evidence. I also checked `CONTRIBUTING.md` and `HACKING.pod`; relevant local conventions/helpers include taint-compatible Perl with `strict`/`warnings`, `Munin::Common::Daemon::emit_sd_notify_message`, `Munin::Common::Timeout::do_with_timeout`, `Munin::Node::OS->run_as_child`, and the existing `Net::Server::Fork` hooks.
No source change was made because the evidence remains indirect and the bounded local reproduction was blocked before an idle loop could be observed. The expected effect is to avoid sending upstream a speculative behavioral change for normal daemon waiting behavior.
## Git Add Paths
None
## Validation
`make` from the workspace root failed:
`Can't locate Module/Build.pm in @INC ... at Build.PL line 80`, followed by `make: *** [Makefile:149: Build] Error 2`.
`make check` failed because this Makefile has no `check` target:
`make: *** No rule to make target 'check'. Stop.`
`make test` failed at the same build prerequisite:
`Can't locate Module/Build.pm in @INC ... at Build.PL line 80`.
Focused checks:
`perl -T -Ilib -c script/munin-node` passed with `script/munin-node syntax OK`.
`perl -Ilib -c lib/Munin/Node/Server.pm` passed with `lib/Munin/Node/Server.pm syntax OK`.
Independent reproduction attempts:
`strace -f -ttT ... perl -T -Ilib script/munin-node ...` was blocked by the sandbox: `PTRACE_TRACEME: Operation not permitted`.
A bounded `munin-node` smoke run with an absolute temporary config and high port failed before the event loop: `Cannot bind and listen to TCP port 54949 on 127.0.0.1 [Operation not permitted]`. No local command reproduced sustained CPU or rapid non-blocking poll returns.
## Review Pass 1
RESULT: ok
No source diff is present, and that matches the evidence level. The author correctly treated the profiler/strace signal as indirect, used `## Evidence Confidence` = `inferred`, listed `None` under `## Git Add Paths`, and avoided a speculative source patch.
Validation is acceptable for a no-patch diagnosis: project-level `make`, `make check`, and `make test` were attempted with exact blockers, then focused Perl syntax checks and bounded reproduction attempts were reported. The explanation also ties the evidence to the likely `Net::Server::Fork` idle accept loop and names the relevant Munin style docs and local helpers.perl likely remains stuck in a busy-poll loop. The diagnosis was captured, but the patch proposal did not complete cleanly.
execution
/usr/bin/perl -wT /usr/sbin/munin-node --foregroundThe trace repeatedly returns to a poll-family syscall without meaningful blocking, which suggests a busy event-loop wakeup.
Thread 1 (Thread 0x7f82eb914b80 (LWP 3947104) "munin-node"):
#0 0x00007f82eb9e87d2 in ?? () from target:<path>
#1 0x00007f82eb9e87ed in ?? () from target:<path>
#2 0x00007f82eba686cf in select () from target:<path>
#3 0x000055b5551b8ee4 in ?? ()
#4 0x000055b55521a496 in Perl_runops_standard ()
#5 0x000055b555100b85 in perl_run ()
#6 0x000055b5550d35ae in main ()## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.## Plan Pass
## Workflow Note
{"type":"turn.started"}
{"type":"error","message":"Reconnecting... 1/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 2/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 3/5 (stream disconnected before completion: Your authentication token has been invalidated. Please try signing in again.)"}
{"type":"error","message":"Reconnecting... 4/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 5/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"We're currently experiencing high demand, which may cause temporary errors."}
{"type":"turn.failed","error":{"message":"We're currently experiencing high demand, which may cause temporary errors."}}perl likely remains stuck in a busy-poll loop. The diagnosis was captured, but the patch proposal did not complete cleanly.
execution
/usr/bin/perl -wT /usr/sbin/munin-node --foregroundThe trace repeatedly returns to a poll-family syscall without meaningful blocking, which suggests a busy event-loop wakeup.
Thread 1 (Thread 0x7f82eb914b80 (LWP 3947104) "munin-node"):
#0 0x00007f82eb9e87d2 in ?? () from target:<path>
#1 0x00007f82eb9e87ed in ?? () from target:<path>
#2 0x00007f82eba686cf in select () from target:<path>
#3 0x000055b5551b8ee4 in ?? ()
#4 0x000055b55521a496 in Perl_runops_standard ()
#5 0x000055b555100b85 in perl_run ()
#6 0x000055b5550d35ae in main ()## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.## Plan Pass
## Workflow Note
{"type":"turn.started"}
{"type":"error","message":"Reconnecting... 1/5 (stream disconnected before completion: Your authentication token has been invalidated. Please try signing in again.)"}
{"type":"error","message":"Reconnecting... 2/5 (stream disconnected before completion: Your authentication token has been invalidated. Please try signing in again.)"}
{"type":"error","message":"Reconnecting... 3/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 4/5 (stream disconnected before completion: Your authentication token has been invalidated. Please try signing in again.)"}
{"type":"error","message":"Reconnecting... 5/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"stream disconnected before completion: Your authentication token has been invalidated. Please try signing in again."}
{"type":"turn.failed","error":{"message":"stream disconnected before completion: Your authentication token has been invalidated. Please try signing in again."}}perl likely remains stuck in a busy-poll loop. The diagnosis was captured, but the patch proposal did not complete cleanly.
execution
/usr/bin/perl -wT /usr/sbin/munin-node --foregroundThe trace repeatedly returns to a poll-family syscall without meaningful blocking, which suggests a busy event-loop wakeup.
Thread 1 (Thread 0x7f82eb914b80 (LWP 3947104) "munin-node"):
#0 0x00007f82eb9e87d2 in ?? () from target:<path>
#1 0x00007f82eb9e87ed in ?? () from target:<path>
#2 0x00007f82eba686cf in select () from target:<path>
#3 0x000055b5551b8ee4 in ?? ()
#4 0x000055b55521a496 in Perl_runops_standard ()
#5 0x000055b555100b85 in perl_run ()
#6 0x000055b5550d35ae in main ()## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.## Plan Pass
## Workflow Note
{"type":"turn.started"}
{"type":"error","message":"Reconnecting... 1/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 2/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 3/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 4/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 5/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"We're currently experiencing high demand, which may cause temporary errors."}
{"type":"turn.failed","error":{"message":"We're currently experiencing high demand, which may cause temporary errors."}}perl likely remains stuck in a busy-poll loop. The diagnosis was captured, but the patch proposal did not complete cleanly.
execution
/usr/bin/perl -wT /usr/sbin/munin-node --foregroundThe trace repeatedly returns to a poll-family syscall without meaningful blocking, which suggests a busy event-loop wakeup.
Thread 1 (Thread 0x7f82eb914b80 (LWP 3947104) "munin-node"):
#0 0x00007f82eb9e87d2 in ?? () from target:<path>
#1 0x00007f82eb9e87ed in ?? () from target:<path>
#2 0x00007f82eba686cf in select () from target:<path>
#3 0x000055b5551b8ee4 in ?? ()
#4 0x000055b55521a496 in Perl_runops_standard ()
#5 0x000055b555100b85 in perl_run ()
#6 0x000055b5550d35ae in main ()## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.## Plan Pass
## Workflow Note
{"type":"turn.started"}
{"type":"error","message":"Reconnecting... 1/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 2/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 3/5 (stream disconnected before completion: Your authentication token has been invalidated. Please try signing in again.)"}
{"type":"error","message":"Reconnecting... 4/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 5/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"stream disconnected before completion: Your authentication token has been invalidated. Please try signing in again."}
{"type":"turn.failed","error":{"message":"stream disconnected before completion: Your authentication token has been invalidated. Please try signing in again."}}perl likely remains stuck in a busy-poll loop. The diagnosis was captured, but the patch proposal did not complete cleanly.
execution
/usr/bin/perl -wT /usr/sbin/munin-node --foregroundThe trace repeatedly returns to a poll-family syscall without meaningful blocking, which suggests a busy event-loop wakeup.
Thread 1 (Thread 0x7f82eb914b80 (LWP 3947104) "munin-node"):
#0 0x00007f82eb9e87d2 in ?? () from target:<path>
#1 0x00007f82eb9e87ed in ?? () from target:<path>
#2 0x00007f82eba686cf in select () from target:<path>
#3 0x000055b5551b8ee4 in ?? ()
#4 0x000055b55521a496 in Perl_runops_standard ()
#5 0x000055b555100b85 in perl_run ()
#6 0x000055b5550d35ae in main ()## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.## Plan Pass
## Workflow Note
{"type":"turn.started"}
{"type":"error","message":"Reconnecting... 1/5 (stream disconnected before completion: Your authentication token has been invalidated. Please try signing in again.)"}
{"type":"error","message":"Reconnecting... 2/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 3/5 (stream disconnected before completion: Your authentication token has been invalidated. Please try signing in again.)"}
{"type":"error","message":"Reconnecting... 4/5 (stream disconnected before completion: Your authentication token has been invalidated. Please try signing in again.)"}
{"type":"error","message":"Reconnecting... 5/5 (stream disconnected before completion: Your authentication token has been invalidated. Please try signing in again.)"}
{"type":"error","message":"stream disconnected before completion: Your authentication token has been invalidated. Please try signing in again."}
{"type":"turn.failed","error":{"message":"stream disconnected before completion: Your authentication token has been invalidated. Please try signing in again."}}perl likely remains stuck in a busy-poll loop. The diagnosis was captured, but the patch proposal did not complete cleanly.
execution
/usr/bin/perl -wT /usr/sbin/munin-node --foregroundThe trace repeatedly returns to a poll-family syscall without meaningful blocking, which suggests a busy event-loop wakeup.
Thread 1 (Thread 0x7f82eb914b80 (LWP 3947104) "munin-node"):
#0 0x00007f82eb9e87d2 in ?? () from target:<path>
#1 0x00007f82eb9e87ed in ?? () from target:<path>
#2 0x00007f82eba686cf in select () from target:<path>
#3 0x000055b5551b8ee4 in ?? ()
#4 0x000055b55521a496 in Perl_runops_standard ()
#5 0x000055b555100b85 in perl_run ()
#6 0x000055b5550d35ae in main ()## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.## Plan Pass
## Workflow Note
{"type":"turn.started"}
{"type":"error","message":"Reconnecting... 1/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 2/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 3/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 4/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 5/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"stream disconnected before completion: Your authentication token has been invalidated. Please try signing in again."}
{"type":"turn.failed","error":{"message":"stream disconnected before completion: Your authentication token has been invalidated. Please try signing in again."}}perl likely remains stuck in a busy-poll loop. The diagnosis was captured, but the patch proposal did not complete cleanly.
execution
/usr/bin/perl -wT /usr/sbin/munin-node --foregroundThe trace repeatedly returns to a poll-family syscall without meaningful blocking, which suggests a busy event-loop wakeup.
Thread 1 (Thread 0x7f82eb914b80 (LWP 3947104) "munin-node"):
#0 0x00007f82eb9e87d2 in ?? () from target:<path>
#1 0x00007f82eb9e87ed in ?? () from target:<path>
#2 0x00007f82eba686cf in select () from target:<path>
#3 0x000055b5551b8ee4 in ?? ()
#4 0x000055b55521a496 in Perl_runops_standard ()
#5 0x000055b555100b85 in perl_run ()
#6 0x000055b5550d35ae in main ()## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.## Plan Pass
## Workflow Note
{"type":"turn.started"}
{"type":"error","message":"Reconnecting... 1/5 (stream disconnected before completion: Your authentication token has been invalidated. Please try signing in again.)"}
{"type":"error","message":"Reconnecting... 2/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 3/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 4/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 5/5 (stream disconnected before completion: Your authentication token has been invalidated. Please try signing in again.)"}
{"type":"error","message":"We're currently experiencing high demand, which may cause temporary errors."}
{"type":"turn.failed","error":{"message":"We're currently experiencing high demand, which may cause temporary errors."}}perl likely remains stuck in a busy-poll loop. The diagnosis was captured, but the patch proposal did not complete cleanly.
execution
/usr/bin/perl -wT /usr/sbin/munin-node --foregroundThe trace repeatedly returns to a poll-family syscall without meaningful blocking, which suggests a busy event-loop wakeup.
Thread 1 (Thread 0x7f82eb914b80 (LWP 3947104) "munin-node"):
#0 0x00007f82eb9e87d2 in ?? () from target:<path>
#1 0x00007f82eb9e87ed in ?? () from target:<path>
#2 0x00007f82eba686cf in select () from target:<path>
#3 0x000055b5551b8ee4 in ?? ()
#4 0x000055b55521a496 in Perl_runops_standard ()
#5 0x000055b555100b85 in perl_run ()
#6 0x000055b5550d35ae in main ()## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.## Plan Pass
## Workflow Note
{"type":"turn.started"}
{"type":"error","message":"Reconnecting... 1/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 2/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 3/5 (stream disconnected before completion: Your authentication token has been invalidated. Please try signing in again.)"}
{"type":"error","message":"Reconnecting... 4/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 5/5 (stream disconnected before completion: Your authentication token has been invalidated. Please try signing in again.)"}
{"type":"error","message":"stream disconnected before completion: Your authentication token has been invalidated. Please try signing in again."}
{"type":"turn.failed","error":{"message":"stream disconnected before completion: Your authentication token has been invalidated. Please try signing in again."}}perl likely remains stuck in a busy-poll loop. The diagnosis was captured, but the patch proposal did not complete cleanly.
execution
/usr/bin/perl -wT /usr/sbin/munin-node --foregroundThe trace repeatedly returns to a poll-family syscall without meaningful blocking, which suggests a busy event-loop wakeup.
Thread 1 (Thread 0x7f82eb914b80 (LWP 3947104) "munin-node"):
#0 0x00007f82eb9e87d2 in ?? () from target:<path>
#1 0x00007f82eb9e87ed in ?? () from target:<path>
#2 0x00007f82eba686cf in select () from target:<path>
#3 0x000055b5551b8ee4 in ?? ()
#4 0x000055b55521a496 in Perl_runops_standard ()
#5 0x000055b555100b85 in perl_run ()
#6 0x000055b5550d35ae in main ()## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.## Plan Pass
## Workflow Note
{"type":"turn.started"}
{"type":"error","message":"Reconnecting... 1/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 2/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 3/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 4/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 5/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"We're currently experiencing high demand, which may cause temporary errors."}
{"type":"turn.failed","error":{"message":"We're currently experiencing high demand, which may cause temporary errors."}}perl likely remains stuck in a busy-poll loop. The diagnosis was captured, but the patch proposal did not complete cleanly.
execution
/usr/bin/perl -wT /usr/sbin/munin-node --foregroundThe trace repeatedly returns to a poll-family syscall without meaningful blocking, which suggests a busy event-loop wakeup.
Thread 1 (Thread 0x7f82eb914b80 (LWP 3947104) "munin-node"):
#0 0x00007f82eb9e87d2 in ?? () from target:<path>
#1 0x00007f82eb9e87ed in ?? () from target:<path>
#2 0x00007f82eba686cf in select () from target:<path>
#3 0x000055b5551b8ee4 in ?? ()
#4 0x000055b55521a496 in Perl_runops_standard ()
#5 0x000055b555100b85 in perl_run ()
#6 0x000055b5550d35ae in main ()## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.## Plan Pass
## Workflow Note
{"type":"turn.started"}
{"type":"error","message":"Reconnecting... 1/5 (stream disconnected before completion: Your authentication token has been invalidated. Please try signing in again.)"}
{"type":"error","message":"Reconnecting... 2/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 3/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 4/5 (stream disconnected before completion: Your authentication token has been invalidated. Please try signing in again.)"}
{"type":"error","message":"Reconnecting... 5/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"We're currently experiencing high demand, which may cause temporary errors."}
{"type":"turn.failed","error":{"message":"We're currently experiencing high demand, which may cause temporary errors."}}perl likely remains stuck in a busy-poll loop. A diagnosis report and patch proposal were created locally.
## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.
## Patch Pass
You are working on a bounded fixer proposal.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Produce the smallest reasonable patch for the target repository, keep the change upstreamable, prefer the clearest control flow available, and do not keep avoidable `goto` when a simpler structure would read better. Before introducing new file, process, allocation, locking, networking, or platform APIs, inspect nearby code and project contribution docs for existing helpers or compatibility wrappers and use those local patterns unless you can explain why they do not fit. Validate from a reproducible workspace-root entrypoint before falling back to focused leaf commands; if a build or test cannot run, report the exact command, the exact blocker, and any narrower check you ran instead. During validation, also try one bounded independent reproduction of the collected failure signal when it is safe and cheap, such as a failing test, smoke command, perf/strace comparison, or before/after runtime check. Only use `reproduced` if that command or test actually reproduced the failure; otherwise keep `observed` and report the reproduction blocker. The final explanation must connect the observed issue evidence to the actual code change, not just paraphrase the diff. Write like a maintainer is going to read the patch mail cold: explain the bug in plain language, define subsystem-specific jargon the first time you need it, and make the causal story obvious. Explicitly classify evidence confidence as `reproduced`, `observed`, or `inferred`: `reproduced` means you reproduced the failure locally; `observed` means Fixer has direct crash/log/trace evidence but you did not independently reproduce it; `inferred` means the source patch is not pull-request-ready, so do not leave a source diff unless you first gather stronger observed/reproduced evidence; otherwise return a no-patch diagnosis/report. For any source-changing `observed` patch, say explicitly in `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. Security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior need reproduced evidence plus explicit security-impact analysis before leaving a source diff; otherwise return a no-patch diagnosis/report for human review. If you introduce non-obvious state translation, index remapping, or backend split logic, add a short source comment that explains the invariant being preserved.
Start by explaining the likely root cause from the collected perf, strace, and /proc evidence. If you cannot land a safe patch, leave a diagnosis that is strong enough for an upstream bug report.
Interpreter process expectation: when the hot process is Python, Perl, shell, Node, Ruby, PHP, Lua, or another interpreter, inspect both the runtime and the script/application entrypoint from `details.interpreter_process`. Prefer the script or application package when evidence points there; do not patch the interpreter runtime merely because the hot binary is `python`, `perl`, `bash`, or similar. Runtime fixes are welcome only after checking the entrypoint and explaining why the runtime mishandles the workload or why running bad code faster/safer is itself the right upstream fix.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Keep the change narrowly scoped and summarize validation clearly.
In every authoring pass, your final response must start with `Subject: <single-line git commit subject>` and then include these markdown sections exactly:
## Commit Message
A short upstream-friendly explanation of what changed and why. Write it in plain language that a maintainer can follow without local complaint context. If you use subsystem jargon, define it immediately.
## Evidence Confidence
Exactly one word: `reproduced`, `observed`, or `inferred`. Use `reproduced` only when you reproduced the failure locally with a command or test, and include that command/test in `## Validation`. Use `observed` when Fixer has direct crash/log/trace evidence but you did not independently reproduce it. If `## Git Add Paths` lists source files for an `observed` patch, `## Issue Connection` must explicitly say the failure was observed by Fixer and not independently reproduced. Security-sensitive source changes touching authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior require reproduced evidence and explicit security-impact analysis; otherwise list `None` under `## Git Add Paths` and write a no-patch diagnosis/report. Use `inferred` for profiler/strace/indirect evidence; inferred responses may be no-patch diagnoses or reports, but inferred source patches are not pull-request-ready until stronger evidence is gathered.
## Issue Connection
Write this as maintainer-facing patch mail, not as local Fixer notes. Cover four things explicitly in readable sentences: the user-visible symptom or the exact collected signal, the code-level cause or the cautious inference from evidence, the specific change you made, and the expected effect. Do not invent a reproducer, command line, crash, or user-visible failure that is not present in the evidence bundle. If the evidence is direct-but-not-reproduced, say it was observed by Fixer and not independently reproduced. If the evidence is indirect and you did not gather stronger evidence, do not leave a source diff; write a no-patch diagnosis/report instead. Include an explicit effect sentence such as `The expected effect is ...`, `This should reduce ...`, or `This prevents ...` for source patches. If the logic is non-obvious in code, mention that you added a short explanatory comment.
## Git Add Paths
List the repo-relative paths that belong in the final patch, one per line. Use `None` only when you intentionally made no source changes. Include intentionally new files, and do not list generated build artifacts.
## Validation
List the checks you ran, or say clearly that you could not run them. Include the independent reproduction command/test and result when `## Evidence Confidence` is `reproduced`; if reproduction was attempted but blocked, name the exact blocker and keep confidence at `observed` or `inferred`.
Before editing, read the plan at `./plan-output.txt` and follow it unless the code proves part of it wrong. If you change course, say so explicitly in the final write-up instead of silently drifting from the plan.
## Review Pass 1
You are reviewing a freshly generated fixer patch.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Review the first patch pass. The original pre-edit snapshot is available at `./source` for diffing.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout. The latest author response is at `./patch-output.txt`. Inspect the current code and changed paths like a strict code reviewer. Focus on correctness, regressions, maintainability, awkward control flow such as avoidable `goto`, missing validation, weak or non-gittable commit message text, and explanations that fail to connect the observed issue evidence to the code change. Also review the maintainer experience: the patch mail should be easy to accept upstream, the user-visible bug should be explained in plain language, subsystem-specific jargon should be defined when first used, and any non-obvious state translation or index remapping in code should have a short explanatory comment. Reject patches that omit `## Evidence Confidence`, use anything other than `reproduced`, `observed`, or `inferred`, or sound more certain than that evidence level allows. Reject patches that claim `reproduced` unless `## Validation` names the concrete reproduction command or test and its result. Reject source patches in security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior unless the author reproduced the behavior and explicitly analyzed the security impact of the change; observed-only evidence should become a diagnosis/report, not a PR-ready source diff. Reject patches that invent a reproducer, command line, crash, or user-visible failure not present in the evidence bundle; indirect profiler or strace evidence may justify a cautious mitigation, but the author must say it is indirect instead of presenting it as a confirmed upstream bug. Reject patches that introduce generic libc/std APIs when nearby code or project docs provide a local compat/helper API for the same job, unless the author explicitly justifies the exception. Reject validation that only reports a leaf object/syntax build when a project-level configure/build/test entrypoint exists and was not attempted; if a full build cannot run, the author must show the exact failed command and blocker.
Do not apply code changes in this pass.
Return a short markdown review report. The first non-empty line must be exactly one of:
RESULT: ok
RESULT: fix-needed
If you choose `RESULT: fix-needed`, add a `## Findings` section with concrete, actionable items.## Plan Pass
## Problem
Fixer observed `/usr/sbin/munin-node --foreground` under Perl in repeated `pselect6`, but the retained evidence does not tie the loop to a Munin source line. The captured process was sleeping, CPU was only `0.9%`, and `strace` showed blocking waits of about 1.8-2.0 seconds, so this is not yet a confirmed busy-spin in Munin.
## Evidence Confidence
inferred
## Proposed Subject
No source patch yet: report/diagnose the profiler-only runaway-process signal for `munin-node` and collect a source-level reproduction before editing.
## Patch Plan
Do not edit Munin in this pass. The current evidence is internally weak for a PR-ready fix: it names a Perl interpreter process and `munin-node`, but lacks a Perl stack, request state, or command path showing Munin logic waking too often.
If later evidence proves a Munin bug, investigate `script/munin-node`, `lib/Munin/Node/Server.pm`, and `lib/Munin/Node/OS.pm` first. Follow local conventions from `CONTRIBUTING.md` and `HACKING.pod`: `use strict`, `use warnings`, clear English variable names via `English`, one statement per line, and file-local indentation style. Prefer existing helpers: `Munin::Common::Timeout::do_with_timeout` for bounded request/plugin execution, `Munin::Node::OS->run_as_child` and `reap_child_group` for plugin subprocess handling, and `Munin::Common::Logger` for logging. The accept loop itself is delegated to `Net::Server::Fork`; I found no Munin-local wrapper for that idle `select` loop.
No prior Fixer patch is present in this workspace to improve or replace. Any eventual patch should use simple bounded conditionals/returns and avoid awkward control flow such as unnecessary `goto`.
## Risks
Changing timeout, polling, or throttling behavior is security-sensitive because it can affect service availability and request handling. A source patch is blocked until validation reproduces the behavior and shows whether the impact is Munin logic, `Net::Server::Fork`, Perl runtime behavior, or a profiler artifact.
## Validation
First try project-level validation from the workspace root: `make`. There is no `make check` target in the Makefile, so use `make test` after `make` if dependencies allow it. If either fails due to missing Perl modules or generated files, record the exact command and failure reason.
Bounded independent reproduction attempt: after `make` generates files, run `munin-node` in foreground with a temporary minimal config and capture `strace -ttT -f -e trace=pselect6,select,poll,ppoll,epoll_wait,nanosleep,clock_nanosleep` plus `ps -o stat,pcpu,wchan,args`. Do not claim reproduction unless that command shows non-blocking rapid wakeups or sustained CPU consistent with the collected failure signal.
## Patch Pass
Subject: Diagnose munin-node pselect evidence without patch
## Commit Message
No source patch is included. The likely root cause from the collected evidence is an idle `munin-node` process waiting in the `Net::Server::Fork` accept loop, not a proven runaway loop in Munin code: `/proc` reported the process sleeping, CPU was `0.9%`, and `strace` showed `pselect6` calls blocking for about two seconds.
## Evidence Confidence
inferred
## Issue Connection
Fixer collected a Perl process running `/usr/sbin/munin-node --foreground` with native frames under `select()` and repeated `pselect6` syscalls. The same evidence also shows `State: S (sleeping)`, `wchan: poll_schedule_timeout.constprop.0`, and only three `pselect6` calls over five seconds, each with a multi-second timeout, so the signal is profiler/trace evidence rather than a reproduced Munin busy loop.
I inspected the script entrypoint (`script/munin-node`) before considering the Perl runtime, as required for interpreter processes. The relevant accept loop is delegated to `Net::Server::Fork`; request and plugin work is bounded with local helpers such as `Munin::Common::Timeout::do_with_timeout`, `Munin::Node::OS->run_as_child`, `reap_child_group`, and `Munin::Common::Logger`. I found no Munin-local helper wrapping the idle server accept `select()` loop. `CONTRIBUTING.md` and `HACKING.pod` require strict/warnings, existing file style, and normal upstream Perl conventions.
The specific change made is no source change. Timing/throttling changes to a daemon accept loop are availability-sensitive, and the evidence does not reproduce a tight wakeup or tie the sampled stack to a Munin source bug. The expected effect is to avoid landing a speculative upstream patch and instead leave a reportable diagnosis: collect a Perl-level stack or an attach-time syscall trace that shows rapid non-blocking wakeups before changing Munin or Perl.
## Git Add Paths
None
## Validation
`make` failed from the workspace root because `Module::Build` is missing:
`Can't locate Module/Build.pm in @INC ... at Build.PL line 80.`
`make check` is not available:
`make: *** No rule to make target 'check'. Stop.`
`make test` failed for the same project build blocker:
`Can't locate Module/Build.pm in @INC ... at Build.PL line 80.`
Focused checks run:
`perl -T -Ilib -c script/munin-node` passed.
`perl -Ilib -c lib/Munin/Node/Server.pm` passed.
`perl -Ilib -c lib/Munin/Common/Timeout.pm` passed.
`perl -Ilib -c lib/Munin/Node/OS.pm` passed with existing “Subroutine ... redefined” warnings.
Independent reproduction attempts were blocked. `strace` failed with `PTRACE_TRACEME: Operation not permitted`, and a foreground `munin-node` smoke run using a temporary empty service directory failed to bind `127.0.0.1:54949` with `Operation not permitted`. I did not reproduce the failure locally, so confidence remains `inferred`.
## Review Pass 1
RESULT: ok
The first pass leaves no source diff, which is appropriate for the evidence level. The author response uses `inferred`, lists `Git Add Paths` as `None`, and avoids presenting the profiler/strace signal as a confirmed Munin bug.
The validation is acceptable for a no-patch diagnosis: project-level `make`, unavailable `make check`, and `make test` are reported with exact blockers, followed by focused Perl syntax checks and bounded reproduction attempts that were blocked by sandbox `ptrace` and bind restrictions.
I found no current workspace changes to reject.perl likely remains stuck in a busy-poll loop. A diagnosis report and patch proposal were created locally.
## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.
## Patch Pass
You are working on a bounded fixer proposal.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Produce the smallest reasonable patch for the target repository, keep the change upstreamable, prefer the clearest control flow available, and do not keep avoidable `goto` when a simpler structure would read better. Before introducing new file, process, allocation, locking, networking, or platform APIs, inspect nearby code and project contribution docs for existing helpers or compatibility wrappers and use those local patterns unless you can explain why they do not fit. Validate from a reproducible workspace-root entrypoint before falling back to focused leaf commands; if a build or test cannot run, report the exact command, the exact blocker, and any narrower check you ran instead. During validation, also try one bounded independent reproduction of the collected failure signal when it is safe and cheap, such as a failing test, smoke command, perf/strace comparison, or before/after runtime check. Only use `reproduced` if that command or test actually reproduced the failure; otherwise keep `observed` and report the reproduction blocker. The final explanation must connect the observed issue evidence to the actual code change, not just paraphrase the diff. Write like a maintainer is going to read the patch mail cold: explain the bug in plain language, define subsystem-specific jargon the first time you need it, and make the causal story obvious. Explicitly classify evidence confidence as `reproduced`, `observed`, or `inferred`: `reproduced` means you reproduced the failure locally; `observed` means Fixer has direct crash/log/trace evidence but you did not independently reproduce it; `inferred` means the source patch is not pull-request-ready, so do not leave a source diff unless you first gather stronger observed/reproduced evidence; otherwise return a no-patch diagnosis/report. For any source-changing `observed` patch, say explicitly in `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. Security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior need reproduced evidence plus explicit security-impact analysis before leaving a source diff; otherwise return a no-patch diagnosis/report for human review. If you introduce non-obvious state translation, index remapping, or backend split logic, add a short source comment that explains the invariant being preserved.
Start by explaining the likely root cause from the collected perf, strace, and /proc evidence. If you cannot land a safe patch, leave a diagnosis that is strong enough for an upstream bug report.
Interpreter process expectation: when the hot process is Python, Perl, shell, Node, Ruby, PHP, Lua, or another interpreter, inspect both the runtime and the script/application entrypoint from `details.interpreter_process`. Prefer the script or application package when evidence points there; do not patch the interpreter runtime merely because the hot binary is `python`, `perl`, `bash`, or similar. Runtime fixes are welcome only after checking the entrypoint and explaining why the runtime mishandles the workload or why running bad code faster/safer is itself the right upstream fix.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Keep the change narrowly scoped and summarize validation clearly.
In every authoring pass, your final response must start with `Subject: <single-line git commit subject>` and then include these markdown sections exactly:
## Commit Message
A short upstream-friendly explanation of what changed and why. Write it in plain language that a maintainer can follow without local complaint context. If you use subsystem jargon, define it immediately.
## Evidence Confidence
Exactly one word: `reproduced`, `observed`, or `inferred`. Use `reproduced` only when you reproduced the failure locally with a command or test, and include that command/test in `## Validation`. Use `observed` when Fixer has direct crash/log/trace evidence but you did not independently reproduce it. If `## Git Add Paths` lists source files for an `observed` patch, `## Issue Connection` must explicitly say the failure was observed by Fixer and not independently reproduced. Security-sensitive source changes touching authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior require reproduced evidence and explicit security-impact analysis; otherwise list `None` under `## Git Add Paths` and write a no-patch diagnosis/report. Use `inferred` for profiler/strace/indirect evidence; inferred responses may be no-patch diagnoses or reports, but inferred source patches are not pull-request-ready until stronger evidence is gathered.
## Issue Connection
Write this as maintainer-facing patch mail, not as local Fixer notes. Cover four things explicitly in readable sentences: the user-visible symptom or the exact collected signal, the code-level cause or the cautious inference from evidence, the specific change you made, and the expected effect. Do not invent a reproducer, command line, crash, or user-visible failure that is not present in the evidence bundle. If the evidence is direct-but-not-reproduced, say it was observed by Fixer and not independently reproduced. If the evidence is indirect and you did not gather stronger evidence, do not leave a source diff; write a no-patch diagnosis/report instead. Include an explicit effect sentence such as `The expected effect is ...`, `This should reduce ...`, or `This prevents ...` for source patches. If the logic is non-obvious in code, mention that you added a short explanatory comment.
## Git Add Paths
List the repo-relative paths that belong in the final patch, one per line. Use `None` only when you intentionally made no source changes. Include intentionally new files, and do not list generated build artifacts.
## Validation
List the checks you ran, or say clearly that you could not run them. Include the independent reproduction command/test and result when `## Evidence Confidence` is `reproduced`; if reproduction was attempted but blocked, name the exact blocker and keep confidence at `observed` or `inferred`.
Before editing, read the plan at `./plan-output.txt` and follow it unless the code proves part of it wrong. If you change course, say so explicitly in the final write-up instead of silently drifting from the plan.
## Review Pass 1
You are reviewing a freshly generated fixer patch.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Review the first patch pass. The original pre-edit snapshot is available at `./source` for diffing.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout. The latest author response is at `./patch-output.txt`. Inspect the current code and changed paths like a strict code reviewer. Focus on correctness, regressions, maintainability, awkward control flow such as avoidable `goto`, missing validation, weak or non-gittable commit message text, and explanations that fail to connect the observed issue evidence to the code change. Also review the maintainer experience: the patch mail should be easy to accept upstream, the user-visible bug should be explained in plain language, subsystem-specific jargon should be defined when first used, and any non-obvious state translation or index remapping in code should have a short explanatory comment. Reject patches that omit `## Evidence Confidence`, use anything other than `reproduced`, `observed`, or `inferred`, or sound more certain than that evidence level allows. Reject patches that claim `reproduced` unless `## Validation` names the concrete reproduction command or test and its result. Reject source patches in security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior unless the author reproduced the behavior and explicitly analyzed the security impact of the change; observed-only evidence should become a diagnosis/report, not a PR-ready source diff. Reject patches that invent a reproducer, command line, crash, or user-visible failure not present in the evidence bundle; indirect profiler or strace evidence may justify a cautious mitigation, but the author must say it is indirect instead of presenting it as a confirmed upstream bug. Reject patches that introduce generic libc/std APIs when nearby code or project docs provide a local compat/helper API for the same job, unless the author explicitly justifies the exception. Reject validation that only reports a leaf object/syntax build when a project-level configure/build/test entrypoint exists and was not attempted; if a full build cannot run, the author must show the exact failed command and blocker.
Do not apply code changes in this pass.
Return a short markdown review report. The first non-empty line must be exactly one of:
RESULT: ok
RESULT: fix-needed
If you choose `RESULT: fix-needed`, add a `## Findings` section with concrete, actionable items.## Plan Pass
## Problem
Fixer observed `/usr/sbin/munin-node --foreground` under Perl in repeated `pselect6`, but the retained evidence does not tie the loop to a Munin source line. The captured process was sleeping, CPU was only `0.9%`, and `strace` showed blocking waits of about 1.8-2.0 seconds, so this is not yet a confirmed busy-spin in Munin.
## Evidence Confidence
inferred
## Proposed Subject
No source patch yet: report/diagnose the profiler-only runaway-process signal for `munin-node` and collect a source-level reproduction before editing.
## Patch Plan
Do not edit Munin in this pass. The current evidence is internally weak for a PR-ready fix: it names a Perl interpreter process and `munin-node`, but lacks a Perl stack, request state, or command path showing Munin logic waking too often.
If later evidence proves a Munin bug, investigate `script/munin-node`, `lib/Munin/Node/Server.pm`, and `lib/Munin/Node/OS.pm` first. Follow local conventions from `CONTRIBUTING.md` and `HACKING.pod`: `use strict`, `use warnings`, clear English variable names via `English`, one statement per line, and file-local indentation style. Prefer existing helpers: `Munin::Common::Timeout::do_with_timeout` for bounded request/plugin execution, `Munin::Node::OS->run_as_child` and `reap_child_group` for plugin subprocess handling, and `Munin::Common::Logger` for logging. The accept loop itself is delegated to `Net::Server::Fork`; I found no Munin-local wrapper for that idle `select` loop.
No prior Fixer patch is present in this workspace to improve or replace. Any eventual patch should use simple bounded conditionals/returns and avoid awkward control flow such as unnecessary `goto`.
## Risks
Changing timeout, polling, or throttling behavior is security-sensitive because it can affect service availability and request handling. A source patch is blocked until validation reproduces the behavior and shows whether the impact is Munin logic, `Net::Server::Fork`, Perl runtime behavior, or a profiler artifact.
## Validation
First try project-level validation from the workspace root: `make`. There is no `make check` target in the Makefile, so use `make test` after `make` if dependencies allow it. If either fails due to missing Perl modules or generated files, record the exact command and failure reason.
Bounded independent reproduction attempt: after `make` generates files, run `munin-node` in foreground with a temporary minimal config and capture `strace -ttT -f -e trace=pselect6,select,poll,ppoll,epoll_wait,nanosleep,clock_nanosleep` plus `ps -o stat,pcpu,wchan,args`. Do not claim reproduction unless that command shows non-blocking rapid wakeups or sustained CPU consistent with the collected failure signal.
## Patch Pass
Subject: Diagnose munin-node pselect evidence without patch
## Commit Message
No source patch is included. The likely root cause from the collected evidence is an idle `munin-node` process waiting in the `Net::Server::Fork` accept loop, not a proven runaway loop in Munin code: `/proc` reported the process sleeping, CPU was `0.9%`, and `strace` showed `pselect6` calls blocking for about two seconds.
## Evidence Confidence
inferred
## Issue Connection
Fixer collected a Perl process running `/usr/sbin/munin-node --foreground` with native frames under `select()` and repeated `pselect6` syscalls. The same evidence also shows `State: S (sleeping)`, `wchan: poll_schedule_timeout.constprop.0`, and only three `pselect6` calls over five seconds, each with a multi-second timeout, so the signal is profiler/trace evidence rather than a reproduced Munin busy loop.
I inspected the script entrypoint (`script/munin-node`) before considering the Perl runtime, as required for interpreter processes. The relevant accept loop is delegated to `Net::Server::Fork`; request and plugin work is bounded with local helpers such as `Munin::Common::Timeout::do_with_timeout`, `Munin::Node::OS->run_as_child`, `reap_child_group`, and `Munin::Common::Logger`. I found no Munin-local helper wrapping the idle server accept `select()` loop. `CONTRIBUTING.md` and `HACKING.pod` require strict/warnings, existing file style, and normal upstream Perl conventions.
The specific change made is no source change. Timing/throttling changes to a daemon accept loop are availability-sensitive, and the evidence does not reproduce a tight wakeup or tie the sampled stack to a Munin source bug. The expected effect is to avoid landing a speculative upstream patch and instead leave a reportable diagnosis: collect a Perl-level stack or an attach-time syscall trace that shows rapid non-blocking wakeups before changing Munin or Perl.
## Git Add Paths
None
## Validation
`make` failed from the workspace root because `Module::Build` is missing:
`Can't locate Module/Build.pm in @INC ... at Build.PL line 80.`
`make check` is not available:
`make: *** No rule to make target 'check'. Stop.`
`make test` failed for the same project build blocker:
`Can't locate Module/Build.pm in @INC ... at Build.PL line 80.`
Focused checks run:
`perl -T -Ilib -c script/munin-node` passed.
`perl -Ilib -c lib/Munin/Node/Server.pm` passed.
`perl -Ilib -c lib/Munin/Common/Timeout.pm` passed.
`perl -Ilib -c lib/Munin/Node/OS.pm` passed with existing “Subroutine ... redefined” warnings.
Independent reproduction attempts were blocked. `strace` failed with `PTRACE_TRACEME: Operation not permitted`, and a foreground `munin-node` smoke run using a temporary empty service directory failed to bind `127.0.0.1:54949` with `Operation not permitted`. I did not reproduce the failure locally, so confidence remains `inferred`.
## Review Pass 1
RESULT: ok
The first pass leaves no source diff, which is appropriate for the evidence level. The author response uses `inferred`, lists `Git Add Paths` as `None`, and avoids presenting the profiler/strace signal as a confirmed Munin bug.
The validation is acceptable for a no-patch diagnosis: project-level `make`, unavailable `make check`, and `make test` are reported with exact blockers, followed by focused Perl syntax checks and bounded reproduction attempts that were blocked by sandbox `ptrace` and bind restrictions.
I found no current workspace changes to reject.perl likely remains stuck in a busy-poll loop. A diagnosis report and patch proposal were created locally.
## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.
## Patch Pass
You are working on a bounded fixer proposal.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Produce the smallest reasonable patch for the target repository, keep the change upstreamable, prefer the clearest control flow available, and do not keep avoidable `goto` when a simpler structure would read better. Before introducing new file, process, allocation, locking, networking, or platform APIs, inspect nearby code and project contribution docs for existing helpers or compatibility wrappers and use those local patterns unless you can explain why they do not fit. Validate from a reproducible workspace-root entrypoint before falling back to focused leaf commands; if a build or test cannot run, report the exact command, the exact blocker, and any narrower check you ran instead. During validation, also try one bounded independent reproduction of the collected failure signal when it is safe and cheap, such as a failing test, smoke command, perf/strace comparison, or before/after runtime check. Only use `reproduced` if that command or test actually reproduced the failure; otherwise keep `observed` and report the reproduction blocker. The final explanation must connect the observed issue evidence to the actual code change, not just paraphrase the diff. Write like a maintainer is going to read the patch mail cold: explain the bug in plain language, define subsystem-specific jargon the first time you need it, and make the causal story obvious. Explicitly classify evidence confidence as `reproduced`, `observed`, or `inferred`: `reproduced` means you reproduced the failure locally; `observed` means Fixer has direct crash/log/trace evidence but you did not independently reproduce it; `inferred` means the source patch is not pull-request-ready, so do not leave a source diff unless you first gather stronger observed/reproduced evidence; otherwise return a no-patch diagnosis/report. For any source-changing `observed` patch, say explicitly in `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. Security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior need reproduced evidence plus explicit security-impact analysis before leaving a source diff; otherwise return a no-patch diagnosis/report for human review. If you introduce non-obvious state translation, index remapping, or backend split logic, add a short source comment that explains the invariant being preserved.
Start by explaining the likely root cause from the collected perf, strace, and /proc evidence. If you cannot land a safe patch, leave a diagnosis that is strong enough for an upstream bug report.
Interpreter process expectation: when the hot process is Python, Perl, shell, Node, Ruby, PHP, Lua, or another interpreter, inspect both the runtime and the script/application entrypoint from `details.interpreter_process`. Prefer the script or application package when evidence points there; do not patch the interpreter runtime merely because the hot binary is `python`, `perl`, `bash`, or similar. Runtime fixes are welcome only after checking the entrypoint and explaining why the runtime mishandles the workload or why running bad code faster/safer is itself the right upstream fix.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Keep the change narrowly scoped and summarize validation clearly.
In every authoring pass, your final response must start with `Subject: <single-line git commit subject>` and then include these markdown sections exactly:
## Commit Message
A short upstream-friendly explanation of what changed and why. Write it in plain language that a maintainer can follow without local complaint context. If you use subsystem jargon, define it immediately.
## Evidence Confidence
Exactly one word: `reproduced`, `observed`, or `inferred`. Use `reproduced` only when you reproduced the failure locally with a command or test, and include that command/test in `## Validation`. Use `observed` when Fixer has direct crash/log/trace evidence but you did not independently reproduce it. If `## Git Add Paths` lists source files for an `observed` patch, `## Issue Connection` must explicitly say the failure was observed by Fixer and not independently reproduced. Security-sensitive source changes touching authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior require reproduced evidence and explicit security-impact analysis; otherwise list `None` under `## Git Add Paths` and write a no-patch diagnosis/report. Use `inferred` for profiler/strace/indirect evidence; inferred responses may be no-patch diagnoses or reports, but inferred source patches are not pull-request-ready until stronger evidence is gathered.
## Issue Connection
Write this as maintainer-facing patch mail, not as local Fixer notes. Cover four things explicitly in readable sentences: the user-visible symptom or the exact collected signal, the code-level cause or the cautious inference from evidence, the specific change you made, and the expected effect. Do not invent a reproducer, command line, crash, or user-visible failure that is not present in the evidence bundle. If the evidence is direct-but-not-reproduced, say it was observed by Fixer and not independently reproduced. If the evidence is indirect and you did not gather stronger evidence, do not leave a source diff; write a no-patch diagnosis/report instead. Include an explicit effect sentence such as `The expected effect is ...`, `This should reduce ...`, or `This prevents ...` for source patches. If the logic is non-obvious in code, mention that you added a short explanatory comment.
## Git Add Paths
List the repo-relative paths that belong in the final patch, one per line. Use `None` only when you intentionally made no source changes. Include intentionally new files, and do not list generated build artifacts.
## Validation
List the checks you ran, or say clearly that you could not run them. Include the independent reproduction command/test and result when `## Evidence Confidence` is `reproduced`; if reproduction was attempted but blocked, name the exact blocker and keep confidence at `observed` or `inferred`.
Before editing, read the plan at `./plan-output.txt` and follow it unless the code proves part of it wrong. If you change course, say so explicitly in the final write-up instead of silently drifting from the plan.
## Review Pass 1
You are reviewing a freshly generated fixer patch.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Review the first patch pass. The original pre-edit snapshot is available at `./source` for diffing.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout. The latest author response is at `./patch-output.txt`. Inspect the current code and changed paths like a strict code reviewer. Focus on correctness, regressions, maintainability, awkward control flow such as avoidable `goto`, missing validation, weak or non-gittable commit message text, and explanations that fail to connect the observed issue evidence to the code change. Also review the maintainer experience: the patch mail should be easy to accept upstream, the user-visible bug should be explained in plain language, subsystem-specific jargon should be defined when first used, and any non-obvious state translation or index remapping in code should have a short explanatory comment. Reject patches that omit `## Evidence Confidence`, use anything other than `reproduced`, `observed`, or `inferred`, or sound more certain than that evidence level allows. Reject patches that claim `reproduced` unless `## Validation` names the concrete reproduction command or test and its result. Reject source patches in security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior unless the author reproduced the behavior and explicitly analyzed the security impact of the change; observed-only evidence should become a diagnosis/report, not a PR-ready source diff. Reject patches that invent a reproducer, command line, crash, or user-visible failure not present in the evidence bundle; indirect profiler or strace evidence may justify a cautious mitigation, but the author must say it is indirect instead of presenting it as a confirmed upstream bug. Reject patches that introduce generic libc/std APIs when nearby code or project docs provide a local compat/helper API for the same job, unless the author explicitly justifies the exception. Reject validation that only reports a leaf object/syntax build when a project-level configure/build/test entrypoint exists and was not attempted; if a full build cannot run, the author must show the exact failed command and blocker.
Do not apply code changes in this pass.
Return a short markdown review report. The first non-empty line must be exactly one of:
RESULT: ok
RESULT: fix-needed
If you choose `RESULT: fix-needed`, add a `## Findings` section with concrete, actionable items.## Plan Pass
## Problem
Fixer flagged `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` as a runaway/busy-poll process, but the retained evidence shows `munin-node` sleeping in `pselect6` with about 1.8-2.0 second timeouts and only 0.9% CPU. The evidence does not include a Perl-level stack or a user-visible failure tying the sampled `select()` frame to Munin application logic.
## Evidence Confidence
inferred
## Proposed Subject
No source patch yet: diagnose the `munin-node` idle `Net::Server::Fork` accept loop as likely non-actionable unless an independent reproduction shows high CPU or zero-timeout polling.
## Patch Plan
Do not edit files in this pass. Inspecting the entrypoint first found `script/munin-node` delegates serving to `Munin::Node::Server->run`, and `Munin::Node::Server` subclasses `Net::Server::Fork`. The apparent two-second `pselect6` interval matches `Net::Server::Fork::accept()` using `can_read(2)`, so a periodic idle wakeup is expected, not by itself a tight loop.
Follow Munin maintainer conventions from `CONTRIBUTING.md` and `HACKING.pod`: taint-safe Perl with `strict`/`warnings`, one statement per line, existing style, and `make`/`./Build test` validation. Relevant local helpers/conventions found: `Munin::Common::Timeout::do_with_timeout` for bounded operations, `Munin::Node::OS->run_as_child` for plugin process execution, `Munin::Common::Daemon::emit_sd_notify_message` for daemon readiness, and `Munin::Common::Logger` for logging. No relevant file-IO/path/process helper suggests replacing the Net::Server accept loop.
No prior Fixer patch is present in this workspace. If later evidence proves a Munin bug, avoid awkward control flow such as avoidable `goto`; use a small bounded conditional or helper consistent with the local Perl style.
## Risks
Patching the idle accept timeout would be speculative and could change daemon responsiveness, signal handling, or child-process coordination without evidence of a Munin defect. The current signal is profiler-only/indirect and may be a kernel perf attribution artifact rather than application CPU burn.
## Validation
Before any future source patch, try project-level validation from the workspace root: `make`, then `make test` because there is no `make check` target in the Makefile. If either fails due to missing Perl modules or generated files, record the exact command and failure reason.
Bounded independent reproduction attempt: run `munin-node` from the workspace with a temporary config/service directory in foreground, attach `strace -ttT -e trace=pselect6,select,poll,ppoll`, and sample `ps -o pcpu,stat,wchan,args`. Only claim `reproduced` if this shows sustained high CPU or rapid zero/near-zero-timeout polling; otherwise report that Fixer observed an idle two-second `Net::Server::Fork` wait and no source patch is justified.
## Patch Pass
Subject: No patch: diagnose munin-node idle select evidence
## Commit Message
No source change is proposed. The collected perf, strace, and `/proc` evidence most likely shows `munin-node` idling in `Net::Server::Fork`’s accept loop, not a proven Munin busy loop. `Net::Server::Fork` waits for readable sockets with a two-second `can_read(2)` timeout, matching the retained `pselect6` timings.
## Evidence Confidence
inferred
## Issue Connection
Fixer collected a Perl process running `/usr/sbin/munin-node --foreground` with native frames under `select()`, three `pselect6` samples, process state `S (sleeping)`, `wchan` in `poll_schedule_timeout`, and reported CPU around 0.9%. The retained strace lines show `pselect6` calls sleeping for about 1.8 to 2.0 seconds, not rapid zero-timeout polling.
The cautious code-level inference is that `script/munin-node` delegates to `Munin::Node::Server->run`, `Munin::Node::Server` subclasses `Net::Server::Fork`, and the installed `Net::Server::Fork` runtime uses `can_read(2)` in `accept()`. That explains the observed two-second poll cadence without proving a source bug in Munin or Perl.
I made no source change. The evidence remains profiler/trace based and lacks a Perl-level stack, a reproducible high-CPU run, or a user-visible failure. The expected effect is to avoid landing a speculative upstream patch that changes daemon accept-loop behavior without proof of a defect.
Local conventions/helpers inspected: `CONTRIBUTING.md`, `HACKING.pod`, `Munin::Common::Timeout::do_with_timeout`, `Munin::Node::OS->run_as_child`, `Munin::Common::Daemon::emit_sd_notify_message`, and `Munin::Common::Logger`. No relevant local helper was found that would justify replacing the Net::Server accept loop.
## Git Add Paths
None
## Validation
`make` from the workspace root failed before build generation: `Can't locate Module/Build.pm in @INC ... at Build.PL line 80`, followed by `make: *** [Makefile:149: Build] Error 2`.
`make test` failed for the same blocker: missing `Module::Build.pm` while running `/usr/bin/perl Build.PL --destdir="" --installdirs="site" --verbose`.
`make -n check` confirmed there is no `check` target: `make: *** No rule to make target 'check'. Stop.`
Focused checks run:
`perl -T -Ilib -c script/munin-node` passed.
`perl -Ilib -c lib/Munin/Node/Server.pm` passed.
`perl -Ilib -c lib/Munin/Node/OS.pm` passed, with existing subroutine redefinition warnings.
Independent reproduction attempts did not reproduce the failure. `strace` tracing was blocked by sandbox ptrace restrictions: `PTRACE_TRACEME: Operation not permitted`. A foreground `munin-node` smoke run with a temporary config was blocked by sandbox networking: `Cannot bind and listen to TCP port 54949 on 127.0.0.1 [Operation not permitted]`.
`git status --short` is clean; no source diff was left.
## Review Pass 1
RESULT: ok
No source diff is present, and the no-patch diagnosis is consistent with the evidence level. The author correctly keeps `## Evidence Confidence` at `inferred`, avoids claiming a reproduced Munin bug, lists `None` for git-add paths, and connects the retained `pselect6` timings to `Net::Server::Fork`’s two-second accept wait without overstating certainty.
Validation is acceptable for a no-patch review: project-level `make` and `make test` were attempted and blocked by missing `Module::Build`, `make check` absence was checked, and narrower syntax checks plus a bounded reproduction attempt were reported with sandbox blockers.perl likely remains stuck in a busy-poll loop. A diagnosis report and patch proposal were created locally.
## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.
## Patch Pass
You are working on a bounded fixer proposal.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Produce the smallest reasonable patch for the target repository, keep the change upstreamable, prefer the clearest control flow available, and do not keep avoidable `goto` when a simpler structure would read better. Before introducing new file, process, allocation, locking, networking, or platform APIs, inspect nearby code and project contribution docs for existing helpers or compatibility wrappers and use those local patterns unless you can explain why they do not fit. Validate from a reproducible workspace-root entrypoint before falling back to focused leaf commands; if a build or test cannot run, report the exact command, the exact blocker, and any narrower check you ran instead. During validation, also try one bounded independent reproduction of the collected failure signal when it is safe and cheap, such as a failing test, smoke command, perf/strace comparison, or before/after runtime check. Only use `reproduced` if that command or test actually reproduced the failure; otherwise keep `observed` and report the reproduction blocker. The final explanation must connect the observed issue evidence to the actual code change, not just paraphrase the diff. Write like a maintainer is going to read the patch mail cold: explain the bug in plain language, define subsystem-specific jargon the first time you need it, and make the causal story obvious. Explicitly classify evidence confidence as `reproduced`, `observed`, or `inferred`: `reproduced` means you reproduced the failure locally; `observed` means Fixer has direct crash/log/trace evidence but you did not independently reproduce it; `inferred` means the source patch is not pull-request-ready, so do not leave a source diff unless you first gather stronger observed/reproduced evidence; otherwise return a no-patch diagnosis/report. For any source-changing `observed` patch, say explicitly in `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. Security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior need reproduced evidence plus explicit security-impact analysis before leaving a source diff; otherwise return a no-patch diagnosis/report for human review. If you introduce non-obvious state translation, index remapping, or backend split logic, add a short source comment that explains the invariant being preserved.
Start by explaining the likely root cause from the collected perf, strace, and /proc evidence. If you cannot land a safe patch, leave a diagnosis that is strong enough for an upstream bug report.
Interpreter process expectation: when the hot process is Python, Perl, shell, Node, Ruby, PHP, Lua, or another interpreter, inspect both the runtime and the script/application entrypoint from `details.interpreter_process`. Prefer the script or application package when evidence points there; do not patch the interpreter runtime merely because the hot binary is `python`, `perl`, `bash`, or similar. Runtime fixes are welcome only after checking the entrypoint and explaining why the runtime mishandles the workload or why running bad code faster/safer is itself the right upstream fix.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Keep the change narrowly scoped and summarize validation clearly.
In every authoring pass, your final response must start with `Subject: <single-line git commit subject>` and then include these markdown sections exactly:
## Commit Message
A short upstream-friendly explanation of what changed and why. Write it in plain language that a maintainer can follow without local complaint context. If you use subsystem jargon, define it immediately.
## Evidence Confidence
Exactly one word: `reproduced`, `observed`, or `inferred`. Use `reproduced` only when you reproduced the failure locally with a command or test, and include that command/test in `## Validation`. Use `observed` when Fixer has direct crash/log/trace evidence but you did not independently reproduce it. If `## Git Add Paths` lists source files for an `observed` patch, `## Issue Connection` must explicitly say the failure was observed by Fixer and not independently reproduced. Security-sensitive source changes touching authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior require reproduced evidence and explicit security-impact analysis; otherwise list `None` under `## Git Add Paths` and write a no-patch diagnosis/report. Use `inferred` for profiler/strace/indirect evidence; inferred responses may be no-patch diagnoses or reports, but inferred source patches are not pull-request-ready until stronger evidence is gathered.
## Issue Connection
Write this as maintainer-facing patch mail, not as local Fixer notes. Cover four things explicitly in readable sentences: the user-visible symptom or the exact collected signal, the code-level cause or the cautious inference from evidence, the specific change you made, and the expected effect. Do not invent a reproducer, command line, crash, or user-visible failure that is not present in the evidence bundle. If the evidence is direct-but-not-reproduced, say it was observed by Fixer and not independently reproduced. If the evidence is indirect and you did not gather stronger evidence, do not leave a source diff; write a no-patch diagnosis/report instead. Include an explicit effect sentence such as `The expected effect is ...`, `This should reduce ...`, or `This prevents ...` for source patches. If the logic is non-obvious in code, mention that you added a short explanatory comment.
## Git Add Paths
List the repo-relative paths that belong in the final patch, one per line. Use `None` only when you intentionally made no source changes. Include intentionally new files, and do not list generated build artifacts.
## Validation
List the checks you ran, or say clearly that you could not run them. Include the independent reproduction command/test and result when `## Evidence Confidence` is `reproduced`; if reproduction was attempted but blocked, name the exact blocker and keep confidence at `observed` or `inferred`.
Before editing, read the plan at `./plan-output.txt` and follow it unless the code proves part of it wrong. If you change course, say so explicitly in the final write-up instead of silently drifting from the plan.
## Review Pass 1
You are reviewing a freshly generated fixer patch.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Review the first patch pass. The original pre-edit snapshot is available at `./source` for diffing.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout. The latest author response is at `./patch-output.txt`. Inspect the current code and changed paths like a strict code reviewer. Focus on correctness, regressions, maintainability, awkward control flow such as avoidable `goto`, missing validation, weak or non-gittable commit message text, and explanations that fail to connect the observed issue evidence to the code change. Also review the maintainer experience: the patch mail should be easy to accept upstream, the user-visible bug should be explained in plain language, subsystem-specific jargon should be defined when first used, and any non-obvious state translation or index remapping in code should have a short explanatory comment. Reject patches that omit `## Evidence Confidence`, use anything other than `reproduced`, `observed`, or `inferred`, or sound more certain than that evidence level allows. Reject patches that claim `reproduced` unless `## Validation` names the concrete reproduction command or test and its result. Reject source patches in security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior unless the author reproduced the behavior and explicitly analyzed the security impact of the change; observed-only evidence should become a diagnosis/report, not a PR-ready source diff. Reject patches that invent a reproducer, command line, crash, or user-visible failure not present in the evidence bundle; indirect profiler or strace evidence may justify a cautious mitigation, but the author must say it is indirect instead of presenting it as a confirmed upstream bug. Reject patches that introduce generic libc/std APIs when nearby code or project docs provide a local compat/helper API for the same job, unless the author explicitly justifies the exception. Reject validation that only reports a leaf object/syntax build when a project-level configure/build/test entrypoint exists and was not attempted; if a full build cannot run, the author must show the exact failed command and blocker.
Do not apply code changes in this pass.
Return a short markdown review report. The first non-empty line must be exactly one of:
RESULT: ok
RESULT: fix-needed
If you choose `RESULT: fix-needed`, add a `## Findings` section with concrete, actionable items.## Plan Pass
## Problem
Fixer flagged `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` as a runaway/busy-poll process, but the retained evidence shows `munin-node` sleeping in `pselect6` with about 1.8-2.0 second timeouts and only 0.9% CPU. The evidence does not include a Perl-level stack or a user-visible failure tying the sampled `select()` frame to Munin application logic.
## Evidence Confidence
inferred
## Proposed Subject
No source patch yet: diagnose the `munin-node` idle `Net::Server::Fork` accept loop as likely non-actionable unless an independent reproduction shows high CPU or zero-timeout polling.
## Patch Plan
Do not edit files in this pass. Inspecting the entrypoint first found `script/munin-node` delegates serving to `Munin::Node::Server->run`, and `Munin::Node::Server` subclasses `Net::Server::Fork`. The apparent two-second `pselect6` interval matches `Net::Server::Fork::accept()` using `can_read(2)`, so a periodic idle wakeup is expected, not by itself a tight loop.
Follow Munin maintainer conventions from `CONTRIBUTING.md` and `HACKING.pod`: taint-safe Perl with `strict`/`warnings`, one statement per line, existing style, and `make`/`./Build test` validation. Relevant local helpers/conventions found: `Munin::Common::Timeout::do_with_timeout` for bounded operations, `Munin::Node::OS->run_as_child` for plugin process execution, `Munin::Common::Daemon::emit_sd_notify_message` for daemon readiness, and `Munin::Common::Logger` for logging. No relevant file-IO/path/process helper suggests replacing the Net::Server accept loop.
No prior Fixer patch is present in this workspace. If later evidence proves a Munin bug, avoid awkward control flow such as avoidable `goto`; use a small bounded conditional or helper consistent with the local Perl style.
## Risks
Patching the idle accept timeout would be speculative and could change daemon responsiveness, signal handling, or child-process coordination without evidence of a Munin defect. The current signal is profiler-only/indirect and may be a kernel perf attribution artifact rather than application CPU burn.
## Validation
Before any future source patch, try project-level validation from the workspace root: `make`, then `make test` because there is no `make check` target in the Makefile. If either fails due to missing Perl modules or generated files, record the exact command and failure reason.
Bounded independent reproduction attempt: run `munin-node` from the workspace with a temporary config/service directory in foreground, attach `strace -ttT -e trace=pselect6,select,poll,ppoll`, and sample `ps -o pcpu,stat,wchan,args`. Only claim `reproduced` if this shows sustained high CPU or rapid zero/near-zero-timeout polling; otherwise report that Fixer observed an idle two-second `Net::Server::Fork` wait and no source patch is justified.
## Patch Pass
Subject: No patch: diagnose munin-node idle select evidence
## Commit Message
No source change is proposed. The collected perf, strace, and `/proc` evidence most likely shows `munin-node` idling in `Net::Server::Fork`’s accept loop, not a proven Munin busy loop. `Net::Server::Fork` waits for readable sockets with a two-second `can_read(2)` timeout, matching the retained `pselect6` timings.
## Evidence Confidence
inferred
## Issue Connection
Fixer collected a Perl process running `/usr/sbin/munin-node --foreground` with native frames under `select()`, three `pselect6` samples, process state `S (sleeping)`, `wchan` in `poll_schedule_timeout`, and reported CPU around 0.9%. The retained strace lines show `pselect6` calls sleeping for about 1.8 to 2.0 seconds, not rapid zero-timeout polling.
The cautious code-level inference is that `script/munin-node` delegates to `Munin::Node::Server->run`, `Munin::Node::Server` subclasses `Net::Server::Fork`, and the installed `Net::Server::Fork` runtime uses `can_read(2)` in `accept()`. That explains the observed two-second poll cadence without proving a source bug in Munin or Perl.
I made no source change. The evidence remains profiler/trace based and lacks a Perl-level stack, a reproducible high-CPU run, or a user-visible failure. The expected effect is to avoid landing a speculative upstream patch that changes daemon accept-loop behavior without proof of a defect.
Local conventions/helpers inspected: `CONTRIBUTING.md`, `HACKING.pod`, `Munin::Common::Timeout::do_with_timeout`, `Munin::Node::OS->run_as_child`, `Munin::Common::Daemon::emit_sd_notify_message`, and `Munin::Common::Logger`. No relevant local helper was found that would justify replacing the Net::Server accept loop.
## Git Add Paths
None
## Validation
`make` from the workspace root failed before build generation: `Can't locate Module/Build.pm in @INC ... at Build.PL line 80`, followed by `make: *** [Makefile:149: Build] Error 2`.
`make test` failed for the same blocker: missing `Module::Build.pm` while running `/usr/bin/perl Build.PL --destdir="" --installdirs="site" --verbose`.
`make -n check` confirmed there is no `check` target: `make: *** No rule to make target 'check'. Stop.`
Focused checks run:
`perl -T -Ilib -c script/munin-node` passed.
`perl -Ilib -c lib/Munin/Node/Server.pm` passed.
`perl -Ilib -c lib/Munin/Node/OS.pm` passed, with existing subroutine redefinition warnings.
Independent reproduction attempts did not reproduce the failure. `strace` tracing was blocked by sandbox ptrace restrictions: `PTRACE_TRACEME: Operation not permitted`. A foreground `munin-node` smoke run with a temporary config was blocked by sandbox networking: `Cannot bind and listen to TCP port 54949 on 127.0.0.1 [Operation not permitted]`.
`git status --short` is clean; no source diff was left.
## Review Pass 1
RESULT: ok
No source diff is present, and the no-patch diagnosis is consistent with the evidence level. The author correctly keeps `## Evidence Confidence` at `inferred`, avoids claiming a reproduced Munin bug, lists `None` for git-add paths, and connects the retained `pselect6` timings to `Net::Server::Fork`’s two-second accept wait without overstating certainty.
Validation is acceptable for a no-patch review: project-level `make` and `make test` were attempted and blocked by missing `Module::Build`, `make check` absence was checked, and narrower syntax checks plus a bounded reproduction attempt were reported with sandbox blockers.perl likely remains stuck in a busy-poll loop. The diagnosis was captured, but the patch proposal did not complete cleanly.
execution
/usr/bin/perl -wT /usr/sbin/munin-node --foregroundThe trace repeatedly returns to a poll-family syscall without meaningful blocking, which suggests a busy event-loop wakeup.
Thread 1 (Thread 0x7f82eb914b80 (LWP 3947104) "munin-node"):
#0 0x00007f82eb9e87d2 in ?? () from target:<path>
#1 0x00007f82eb9e87ed in ?? () from target:<path>
#2 0x00007f82eba686cf in select () from target:<path>
#3 0x000055b5551b8ee4 in ?? ()
#4 0x000055b55521a496 in Perl_runops_standard ()
#5 0x000055b555100b85 in perl_run ()
#6 0x000055b5550d35ae in main ()## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.## Plan Pass
## Workflow Note
{"type":"turn.started"}
{"type":"error","message":"Reconnecting... 1/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 2/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 3/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 4/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 5/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"stream disconnected before completion: Your authentication token has been invalidated. Please try signing in again."}
{"type":"turn.failed","error":{"message":"stream disconnected before completion: Your authentication token has been invalidated. Please try signing in again."}}perl likely remains stuck in a busy-poll loop. The diagnosis was captured, but the patch proposal did not complete cleanly.
execution
/usr/bin/perl -wT /usr/sbin/munin-node --foregroundThe trace repeatedly returns to a poll-family syscall without meaningful blocking, which suggests a busy event-loop wakeup.
Thread 1 (Thread 0x7f82eb914b80 (LWP 3947104) "munin-node"):
#0 0x00007f82eb9e87d2 in ?? () from target:<path>
#1 0x00007f82eb9e87ed in ?? () from target:<path>
#2 0x00007f82eba686cf in select () from target:<path>
#3 0x000055b5551b8ee4 in ?? ()
#4 0x000055b55521a496 in Perl_runops_standard ()
#5 0x000055b555100b85 in perl_run ()
#6 0x000055b5550d35ae in main ()## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.## Plan Pass
## Workflow Note
{"type":"turn.started"}
{"type":"error","message":"Reconnecting... 1/5 (stream disconnected before completion: Your authentication token has been invalidated. Please try signing in again.)"}
{"type":"error","message":"Reconnecting... 2/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 3/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 4/5 (stream disconnected before completion: Your authentication token has been invalidated. Please try signing in again.)"}
{"type":"error","message":"Reconnecting... 5/5 (stream disconnected before completion: Your authentication token has been invalidated. Please try signing in again.)"}
{"type":"error","message":"We're currently experiencing high demand, which may cause temporary errors."}
{"type":"turn.failed","error":{"message":"We're currently experiencing high demand, which may cause temporary errors."}}perl likely remains stuck in a busy-poll loop. The diagnosis was captured, but the patch proposal did not complete cleanly.
execution
/usr/bin/perl -wT /usr/sbin/munin-node --foregroundThe trace repeatedly returns to a poll-family syscall without meaningful blocking, which suggests a busy event-loop wakeup.
Thread 1 (Thread 0x7f82eb914b80 (LWP 3947104) "munin-node"):
#0 0x00007f82eb9e87d2 in ?? () from target:<path>
#1 0x00007f82eb9e87ed in ?? () from target:<path>
#2 0x00007f82eba686cf in select () from target:<path>
#3 0x000055b5551b8ee4 in ?? ()
#4 0x000055b55521a496 in Perl_runops_standard ()
#5 0x000055b555100b85 in perl_run ()
#6 0x000055b5550d35ae in main ()## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.## Plan Pass
## Workflow Note
{"type":"turn.started"}
{"type":"error","message":"Reconnecting... 1/5 (stream disconnected before completion: Your authentication token has been invalidated. Please try signing in again.)"}
{"type":"error","message":"Reconnecting... 2/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 3/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 4/5 (stream disconnected before completion: Your authentication token has been invalidated. Please try signing in again.)"}
{"type":"error","message":"Reconnecting... 5/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"We're currently experiencing high demand, which may cause temporary errors."}
{"type":"turn.failed","error":{"message":"We're currently experiencing high demand, which may cause temporary errors."}}perl likely remains stuck in a busy-poll loop. A diagnosis report and patch proposal were created locally.
## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.
## Patch Pass
You are working on a bounded fixer proposal.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Produce the smallest reasonable patch for the target repository, keep the change upstreamable, prefer the clearest control flow available, and do not keep avoidable `goto` when a simpler structure would read better. Before introducing new file, process, allocation, locking, networking, or platform APIs, inspect nearby code and project contribution docs for existing helpers or compatibility wrappers and use those local patterns unless you can explain why they do not fit. Validate from a reproducible workspace-root entrypoint before falling back to focused leaf commands; if a build or test cannot run, report the exact command, the exact blocker, and any narrower check you ran instead. During validation, also try one bounded independent reproduction of the collected failure signal when it is safe and cheap, such as a failing test, smoke command, perf/strace comparison, or before/after runtime check. Only use `reproduced` if that command or test actually reproduced the failure; otherwise keep `observed` and report the reproduction blocker. The final explanation must connect the observed issue evidence to the actual code change, not just paraphrase the diff. Write like a maintainer is going to read the patch mail cold: explain the bug in plain language, define subsystem-specific jargon the first time you need it, and make the causal story obvious. Explicitly classify evidence confidence as `reproduced`, `observed`, or `inferred`: `reproduced` means you reproduced the failure locally; `observed` means Fixer has direct crash/log/trace evidence but you did not independently reproduce it; `inferred` means the source patch is not pull-request-ready, so do not leave a source diff unless you first gather stronger observed/reproduced evidence; otherwise return a no-patch diagnosis/report. For any source-changing `observed` patch, say explicitly in `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. Security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior need reproduced evidence plus explicit security-impact analysis before leaving a source diff; otherwise return a no-patch diagnosis/report for human review. If you introduce non-obvious state translation, index remapping, or backend split logic, add a short source comment that explains the invariant being preserved.
Start by explaining the likely root cause from the collected perf, strace, and /proc evidence. If you cannot land a safe patch, leave a diagnosis that is strong enough for an upstream bug report.
Interpreter process expectation: when the hot process is Python, Perl, shell, Node, Ruby, PHP, Lua, or another interpreter, inspect both the runtime and the script/application entrypoint from `details.interpreter_process`. Prefer the script or application package when evidence points there; do not patch the interpreter runtime merely because the hot binary is `python`, `perl`, `bash`, or similar. Runtime fixes are welcome only after checking the entrypoint and explaining why the runtime mishandles the workload or why running bad code faster/safer is itself the right upstream fix.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Keep the change narrowly scoped and summarize validation clearly.
In every authoring pass, your final response must start with `Subject: <single-line git commit subject>` and then include these markdown sections exactly:
## Commit Message
A short upstream-friendly explanation of what changed and why. Write it in plain language that a maintainer can follow without local complaint context. If you use subsystem jargon, define it immediately.
## Evidence Confidence
Exactly one word: `reproduced`, `observed`, or `inferred`. Use `reproduced` only when you reproduced the failure locally with a command or test, and include that command/test in `## Validation`. Use `observed` when Fixer has direct crash/log/trace evidence but you did not independently reproduce it. If `## Git Add Paths` lists source files for an `observed` patch, `## Issue Connection` must explicitly say the failure was observed by Fixer and not independently reproduced. Security-sensitive source changes touching authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior require reproduced evidence and explicit security-impact analysis; otherwise list `None` under `## Git Add Paths` and write a no-patch diagnosis/report. Use `inferred` for profiler/strace/indirect evidence; inferred responses may be no-patch diagnoses or reports, but inferred source patches are not pull-request-ready until stronger evidence is gathered.
## Issue Connection
Write this as maintainer-facing patch mail, not as local Fixer notes. Cover four things explicitly in readable sentences: the user-visible symptom or the exact collected signal, the code-level cause or the cautious inference from evidence, the specific change you made, and the expected effect. Do not invent a reproducer, command line, crash, or user-visible failure that is not present in the evidence bundle. If the evidence is direct-but-not-reproduced, say it was observed by Fixer and not independently reproduced. If the evidence is indirect and you did not gather stronger evidence, do not leave a source diff; write a no-patch diagnosis/report instead. Include an explicit effect sentence such as `The expected effect is ...`, `This should reduce ...`, or `This prevents ...` for source patches. If the logic is non-obvious in code, mention that you added a short explanatory comment.
## Git Add Paths
List the repo-relative paths that belong in the final patch, one per line. Use `None` only when you intentionally made no source changes. Include intentionally new files, and do not list generated build artifacts.
## Validation
List the checks you ran, or say clearly that you could not run them. Include the independent reproduction command/test and result when `## Evidence Confidence` is `reproduced`; if reproduction was attempted but blocked, name the exact blocker and keep confidence at `observed` or `inferred`.
Before editing, read the plan at `./plan-output.txt` and follow it unless the code proves part of it wrong. If you change course, say so explicitly in the final write-up instead of silently drifting from the plan.
## Review Pass 1
You are reviewing a freshly generated fixer patch.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Review the first patch pass. The original pre-edit snapshot is available at `./source` for diffing.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout. The latest author response is at `./patch-output.txt`. Inspect the current code and changed paths like a strict code reviewer. Focus on correctness, regressions, maintainability, awkward control flow such as avoidable `goto`, missing validation, weak or non-gittable commit message text, and explanations that fail to connect the observed issue evidence to the code change. Also review the maintainer experience: the patch mail should be easy to accept upstream, the user-visible bug should be explained in plain language, subsystem-specific jargon should be defined when first used, and any non-obvious state translation or index remapping in code should have a short explanatory comment. Reject patches that omit `## Evidence Confidence`, use anything other than `reproduced`, `observed`, or `inferred`, or sound more certain than that evidence level allows. Reject patches that claim `reproduced` unless `## Validation` names the concrete reproduction command or test and its result. Reject source patches in security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior unless the author reproduced the behavior and explicitly analyzed the security impact of the change; observed-only evidence should become a diagnosis/report, not a PR-ready source diff. Reject patches that invent a reproducer, command line, crash, or user-visible failure not present in the evidence bundle; indirect profiler or strace evidence may justify a cautious mitigation, but the author must say it is indirect instead of presenting it as a confirmed upstream bug. Reject patches that introduce generic libc/std APIs when nearby code or project docs provide a local compat/helper API for the same job, unless the author explicitly justifies the exception. Reject validation that only reports a leaf object/syntax build when a project-level configure/build/test entrypoint exists and was not attempted; if a full build cannot run, the author must show the exact failed command and blocker.
Do not apply code changes in this pass.
Return a short markdown review report. The first non-empty line must be exactly one of:
RESULT: ok
RESULT: fix-needed
If you choose `RESULT: fix-needed`, add a `## Findings` section with concrete, actionable items.## Plan Pass
## Problem
Fixer observed `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` in repeated `pselect6` calls. The retained evidence does not include a Perl-level stack or a reproducer tying the samples to a Munin source line. The strace excerpt shows blocking timeouts around 1.8-2.0s, process state `S (sleeping)`, and only 0.9% CPU, so this may be normal idle `Net::Server::Fork` wait behavior rather than a confirmed runaway loop.
## Evidence Confidence
inferred
## Proposed Subject
No source patch yet: report/diagnose the munin-node idle select sample and collect stronger evidence before editing.
## Patch Plan
Do not edit files in this pass. Inspecting `script/munin-node` and `lib/Munin/Node/Server.pm` shows the entrypoint delegates serving to `Munin::Node::Server->run`, which subclasses `Net::Server::Fork`; request handling uses `_net_read`, `_net_write`, `Munin::Common::Timeout::do_with_timeout`, `Munin::Common::Logger`, and `Munin::Common::Daemon::emit_sd_notify_message`.
If later evidence proves a real tight loop in Munin code, patch the bounded node/server path rather than Perl runtime code, follow `CONTRIBUTING.md` and `HACKING.pod` Perl style (`strict`, `warnings`, existing indentation), use existing `Munin::Common::Logger` and `Munin::Common::Timeout` conventions, and avoid awkward control flow such as `goto`. No relevant local file-IO, path, memory, or process-spawn helper appears involved in the observed idle wait path. No prior Fixer patch for this finding was found in `debian/patches` or the working tree.
## Risks
A source patch based only on this evidence would likely change normal daemon idle behavior without proving a user-visible defect. Changing timeout, accept-loop, or TLS/session behavior could regress daemon availability or connection handling. This is not security-sensitive as planned, because no authentication, authorization, credentials, cryptography semantics, sandboxing, permissions, or throttling behavior will be changed.
## Validation
Project-level validation to try from the workspace root before any focused checks: `make`, then `make check` only if available; this tree’s Makefile exposes `make test`, not a visible `check` target.
Bounded independent evidence check before any future edit: run munin-node foreground with the test or generated config under short `strace -ttT -f -e trace=pselect6,select,poll,ppoll,epoll_wait,nanosleep,clock_nanosleep`, plus `ps -o stat,pcpu,wchan,args`, and only call the issue reproduced if it shows non-blocking/near-zero-duration poll syscalls with meaningful CPU. If it instead shows sleeping 1-2s waits and low CPU like the bundle, keep this as a no-patch diagnosis.
## Patch Pass
Subject: No patch: diagnose munin-node idle select sample
## Commit Message
No source change is proposed. The collected signal most likely shows `munin-node` idling in the `Net::Server::Fork` accept loop: the trace has repeated `pselect6` calls, but they block for about two seconds, the process is sleeping, and CPU is only 0.9%. That is not enough evidence for an upstream source patch.
## Evidence Confidence
inferred
## Issue Connection
Fixer collected perf, strace, and `/proc` evidence for `/usr/bin/perl -wT /usr/sbin/munin-node --foreground`. The exact signal was repeated `pselect6` under Perl, but the retained strace shows timed waits of about 1.8-2.0 seconds, `/proc` shows state `S (sleeping)`, and the profile target reports only 0.9% CPU.
The cautious code-level inference is that this is probably the normal `munin-node` server idle path rather than a proven busy loop. The script entrypoint `script/munin-node` delegates to `Munin::Node::Server->run`, and `lib/Munin/Node/Server.pm` subclasses `Net::Server::Fork`; no Perl-level stack ties the sampled wait to a Munin bug, and the evidence does not prove a Perl runtime bug either.
I followed the saved plan and left no source diff. I inspected `CONTRIBUTING.md`, `HACKING.pod`, `script/munin-node`, and `lib/Munin/Node/Server.pm`. Relevant local conventions/helpers found were `Munin::Common::Logger`, `Munin::Common::Timeout::do_with_timeout`, `_net_read`, `_net_write`, and `Munin::Common::Daemon::emit_sd_notify_message`; none fit a safe change because no faulty code path was proven.
The expected effect is that this remains a diagnosis suitable for an upstream bug report instead of a speculative patch that could alter normal daemon idle or connection behavior.
## Git Add Paths
None
## Validation
`make` from the workspace root failed before building: `Can't locate Module/Build.pm in @INC ... at Build.PL line 80`, followed by `make: *** [Makefile:149: Build] Error 2`.
`make check` from the workspace root failed because this tree has no check target: `make: *** No rule to make target 'check'. Stop.` The Makefile exposes `build` and `test`.
Focused checks run:
`perl -T -Ilib -c script/munin-node` passed with `script/munin-node syntax OK`.
`perl -Ilib -c lib/Munin/Node/Server.pm` passed with `lib/Munin/Node/Server.pm syntax OK`.
`perl -Ilib -MMunin::Node::Server -e 'print qq{loaded Munin::Node::Server\n}'` loaded the module.
Independent reproduction was attempted but not achieved. `strace -f -ttT ... munin-node ...` was blocked by ptrace restrictions: `PTRACE_TRACEME: Operation not permitted` and `ptrace(PTRACE_SEIZE, 6): Operation not permitted`. A bounded foreground `munin-node` run with absolute config and empty plugin directories exited with status 1 before `ps` could sample it and produced no stderr, so it did not reproduce the collected pselect signal.
## Review Pass 1
RESULT: ok
No source diff is present, and the author correctly treated the profiler/strace signal as `inferred` rather than leaving a speculative patch. The report includes the required evidence confidence, explains why the retained `pselect6` samples look like normal idle waiting, names the relevant Munin entrypoint and local helpers, and reports project-level validation attempts with exact blockers.perl likely remains stuck in a busy-poll loop. A diagnosis report and patch proposal were created locally.
## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.
## Patch Pass
You are working on a bounded fixer proposal.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Produce the smallest reasonable patch for the target repository, keep the change upstreamable, prefer the clearest control flow available, and do not keep avoidable `goto` when a simpler structure would read better. Before introducing new file, process, allocation, locking, networking, or platform APIs, inspect nearby code and project contribution docs for existing helpers or compatibility wrappers and use those local patterns unless you can explain why they do not fit. Validate from a reproducible workspace-root entrypoint before falling back to focused leaf commands; if a build or test cannot run, report the exact command, the exact blocker, and any narrower check you ran instead. During validation, also try one bounded independent reproduction of the collected failure signal when it is safe and cheap, such as a failing test, smoke command, perf/strace comparison, or before/after runtime check. Only use `reproduced` if that command or test actually reproduced the failure; otherwise keep `observed` and report the reproduction blocker. The final explanation must connect the observed issue evidence to the actual code change, not just paraphrase the diff. Write like a maintainer is going to read the patch mail cold: explain the bug in plain language, define subsystem-specific jargon the first time you need it, and make the causal story obvious. Explicitly classify evidence confidence as `reproduced`, `observed`, or `inferred`: `reproduced` means you reproduced the failure locally; `observed` means Fixer has direct crash/log/trace evidence but you did not independently reproduce it; `inferred` means the source patch is not pull-request-ready, so do not leave a source diff unless you first gather stronger observed/reproduced evidence; otherwise return a no-patch diagnosis/report. For any source-changing `observed` patch, say explicitly in `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. Security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior need reproduced evidence plus explicit security-impact analysis before leaving a source diff; otherwise return a no-patch diagnosis/report for human review. If you introduce non-obvious state translation, index remapping, or backend split logic, add a short source comment that explains the invariant being preserved.
Start by explaining the likely root cause from the collected perf, strace, and /proc evidence. If you cannot land a safe patch, leave a diagnosis that is strong enough for an upstream bug report.
Interpreter process expectation: when the hot process is Python, Perl, shell, Node, Ruby, PHP, Lua, or another interpreter, inspect both the runtime and the script/application entrypoint from `details.interpreter_process`. Prefer the script or application package when evidence points there; do not patch the interpreter runtime merely because the hot binary is `python`, `perl`, `bash`, or similar. Runtime fixes are welcome only after checking the entrypoint and explaining why the runtime mishandles the workload or why running bad code faster/safer is itself the right upstream fix.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Keep the change narrowly scoped and summarize validation clearly.
In every authoring pass, your final response must start with `Subject: <single-line git commit subject>` and then include these markdown sections exactly:
## Commit Message
A short upstream-friendly explanation of what changed and why. Write it in plain language that a maintainer can follow without local complaint context. If you use subsystem jargon, define it immediately.
## Evidence Confidence
Exactly one word: `reproduced`, `observed`, or `inferred`. Use `reproduced` only when you reproduced the failure locally with a command or test, and include that command/test in `## Validation`. Use `observed` when Fixer has direct crash/log/trace evidence but you did not independently reproduce it. If `## Git Add Paths` lists source files for an `observed` patch, `## Issue Connection` must explicitly say the failure was observed by Fixer and not independently reproduced. Security-sensitive source changes touching authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior require reproduced evidence and explicit security-impact analysis; otherwise list `None` under `## Git Add Paths` and write a no-patch diagnosis/report. Use `inferred` for profiler/strace/indirect evidence; inferred responses may be no-patch diagnoses or reports, but inferred source patches are not pull-request-ready until stronger evidence is gathered.
## Issue Connection
Write this as maintainer-facing patch mail, not as local Fixer notes. Cover four things explicitly in readable sentences: the user-visible symptom or the exact collected signal, the code-level cause or the cautious inference from evidence, the specific change you made, and the expected effect. Do not invent a reproducer, command line, crash, or user-visible failure that is not present in the evidence bundle. If the evidence is direct-but-not-reproduced, say it was observed by Fixer and not independently reproduced. If the evidence is indirect and you did not gather stronger evidence, do not leave a source diff; write a no-patch diagnosis/report instead. Include an explicit effect sentence such as `The expected effect is ...`, `This should reduce ...`, or `This prevents ...` for source patches. If the logic is non-obvious in code, mention that you added a short explanatory comment.
## Git Add Paths
List the repo-relative paths that belong in the final patch, one per line. Use `None` only when you intentionally made no source changes. Include intentionally new files, and do not list generated build artifacts.
## Validation
List the checks you ran, or say clearly that you could not run them. Include the independent reproduction command/test and result when `## Evidence Confidence` is `reproduced`; if reproduction was attempted but blocked, name the exact blocker and keep confidence at `observed` or `inferred`.
Before editing, read the plan at `./plan-output.txt` and follow it unless the code proves part of it wrong. If you change course, say so explicitly in the final write-up instead of silently drifting from the plan.
## Review Pass 1
You are reviewing a freshly generated fixer patch.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Review the first patch pass. The original pre-edit snapshot is available at `./source` for diffing.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout. The latest author response is at `./patch-output.txt`. Inspect the current code and changed paths like a strict code reviewer. Focus on correctness, regressions, maintainability, awkward control flow such as avoidable `goto`, missing validation, weak or non-gittable commit message text, and explanations that fail to connect the observed issue evidence to the code change. Also review the maintainer experience: the patch mail should be easy to accept upstream, the user-visible bug should be explained in plain language, subsystem-specific jargon should be defined when first used, and any non-obvious state translation or index remapping in code should have a short explanatory comment. Reject patches that omit `## Evidence Confidence`, use anything other than `reproduced`, `observed`, or `inferred`, or sound more certain than that evidence level allows. Reject patches that claim `reproduced` unless `## Validation` names the concrete reproduction command or test and its result. Reject source patches in security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior unless the author reproduced the behavior and explicitly analyzed the security impact of the change; observed-only evidence should become a diagnosis/report, not a PR-ready source diff. Reject patches that invent a reproducer, command line, crash, or user-visible failure not present in the evidence bundle; indirect profiler or strace evidence may justify a cautious mitigation, but the author must say it is indirect instead of presenting it as a confirmed upstream bug. Reject patches that introduce generic libc/std APIs when nearby code or project docs provide a local compat/helper API for the same job, unless the author explicitly justifies the exception. Reject validation that only reports a leaf object/syntax build when a project-level configure/build/test entrypoint exists and was not attempted; if a full build cannot run, the author must show the exact failed command and blocker.
Do not apply code changes in this pass.
Return a short markdown review report. The first non-empty line must be exactly one of:
RESULT: ok
RESULT: fix-needed
If you choose `RESULT: fix-needed`, add a `## Findings` section with concrete, actionable items.## Plan Pass
## Problem
Fixer observed `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` in repeated `pselect6` calls. The retained evidence does not include a Perl-level stack or a reproducer tying the samples to a Munin source line. The strace excerpt shows blocking timeouts around 1.8-2.0s, process state `S (sleeping)`, and only 0.9% CPU, so this may be normal idle `Net::Server::Fork` wait behavior rather than a confirmed runaway loop.
## Evidence Confidence
inferred
## Proposed Subject
No source patch yet: report/diagnose the munin-node idle select sample and collect stronger evidence before editing.
## Patch Plan
Do not edit files in this pass. Inspecting `script/munin-node` and `lib/Munin/Node/Server.pm` shows the entrypoint delegates serving to `Munin::Node::Server->run`, which subclasses `Net::Server::Fork`; request handling uses `_net_read`, `_net_write`, `Munin::Common::Timeout::do_with_timeout`, `Munin::Common::Logger`, and `Munin::Common::Daemon::emit_sd_notify_message`.
If later evidence proves a real tight loop in Munin code, patch the bounded node/server path rather than Perl runtime code, follow `CONTRIBUTING.md` and `HACKING.pod` Perl style (`strict`, `warnings`, existing indentation), use existing `Munin::Common::Logger` and `Munin::Common::Timeout` conventions, and avoid awkward control flow such as `goto`. No relevant local file-IO, path, memory, or process-spawn helper appears involved in the observed idle wait path. No prior Fixer patch for this finding was found in `debian/patches` or the working tree.
## Risks
A source patch based only on this evidence would likely change normal daemon idle behavior without proving a user-visible defect. Changing timeout, accept-loop, or TLS/session behavior could regress daemon availability or connection handling. This is not security-sensitive as planned, because no authentication, authorization, credentials, cryptography semantics, sandboxing, permissions, or throttling behavior will be changed.
## Validation
Project-level validation to try from the workspace root before any focused checks: `make`, then `make check` only if available; this tree’s Makefile exposes `make test`, not a visible `check` target.
Bounded independent evidence check before any future edit: run munin-node foreground with the test or generated config under short `strace -ttT -f -e trace=pselect6,select,poll,ppoll,epoll_wait,nanosleep,clock_nanosleep`, plus `ps -o stat,pcpu,wchan,args`, and only call the issue reproduced if it shows non-blocking/near-zero-duration poll syscalls with meaningful CPU. If it instead shows sleeping 1-2s waits and low CPU like the bundle, keep this as a no-patch diagnosis.
## Patch Pass
Subject: No patch: diagnose munin-node idle select sample
## Commit Message
No source change is proposed. The collected signal most likely shows `munin-node` idling in the `Net::Server::Fork` accept loop: the trace has repeated `pselect6` calls, but they block for about two seconds, the process is sleeping, and CPU is only 0.9%. That is not enough evidence for an upstream source patch.
## Evidence Confidence
inferred
## Issue Connection
Fixer collected perf, strace, and `/proc` evidence for `/usr/bin/perl -wT /usr/sbin/munin-node --foreground`. The exact signal was repeated `pselect6` under Perl, but the retained strace shows timed waits of about 1.8-2.0 seconds, `/proc` shows state `S (sleeping)`, and the profile target reports only 0.9% CPU.
The cautious code-level inference is that this is probably the normal `munin-node` server idle path rather than a proven busy loop. The script entrypoint `script/munin-node` delegates to `Munin::Node::Server->run`, and `lib/Munin/Node/Server.pm` subclasses `Net::Server::Fork`; no Perl-level stack ties the sampled wait to a Munin bug, and the evidence does not prove a Perl runtime bug either.
I followed the saved plan and left no source diff. I inspected `CONTRIBUTING.md`, `HACKING.pod`, `script/munin-node`, and `lib/Munin/Node/Server.pm`. Relevant local conventions/helpers found were `Munin::Common::Logger`, `Munin::Common::Timeout::do_with_timeout`, `_net_read`, `_net_write`, and `Munin::Common::Daemon::emit_sd_notify_message`; none fit a safe change because no faulty code path was proven.
The expected effect is that this remains a diagnosis suitable for an upstream bug report instead of a speculative patch that could alter normal daemon idle or connection behavior.
## Git Add Paths
None
## Validation
`make` from the workspace root failed before building: `Can't locate Module/Build.pm in @INC ... at Build.PL line 80`, followed by `make: *** [Makefile:149: Build] Error 2`.
`make check` from the workspace root failed because this tree has no check target: `make: *** No rule to make target 'check'. Stop.` The Makefile exposes `build` and `test`.
Focused checks run:
`perl -T -Ilib -c script/munin-node` passed with `script/munin-node syntax OK`.
`perl -Ilib -c lib/Munin/Node/Server.pm` passed with `lib/Munin/Node/Server.pm syntax OK`.
`perl -Ilib -MMunin::Node::Server -e 'print qq{loaded Munin::Node::Server\n}'` loaded the module.
Independent reproduction was attempted but not achieved. `strace -f -ttT ... munin-node ...` was blocked by ptrace restrictions: `PTRACE_TRACEME: Operation not permitted` and `ptrace(PTRACE_SEIZE, 6): Operation not permitted`. A bounded foreground `munin-node` run with absolute config and empty plugin directories exited with status 1 before `ps` could sample it and produced no stderr, so it did not reproduce the collected pselect signal.
## Review Pass 1
RESULT: ok
No source diff is present, and the author correctly treated the profiler/strace signal as `inferred` rather than leaving a speculative patch. The report includes the required evidence confidence, explains why the retained `pselect6` samples look like normal idle waiting, names the relevant Munin entrypoint and local helpers, and reports project-level validation attempts with exact blockers.perl likely remains stuck in a busy-poll loop. The diagnosis was captured, but the patch proposal did not complete cleanly.
execution
/usr/bin/perl -wT /usr/sbin/munin-node --foregroundThe trace repeatedly returns to a poll-family syscall without meaningful blocking, which suggests a busy event-loop wakeup.
Thread 1 (Thread 0x7f82eb914b80 (LWP 3947104) "munin-node"):
#0 0x00007f82eb9e87d2 in ?? () from target:<path>
#1 0x00007f82eb9e87ed in ?? () from target:<path>
#2 0x00007f82eba686cf in select () from target:<path>
#3 0x000055b5551b8ee4 in ?? ()
#4 0x000055b55521a496 in Perl_runops_standard ()
#5 0x000055b555100b85 in perl_run ()
#6 0x000055b5550d35ae in main ()## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.## Plan Pass
## Workflow Note
{"type":"turn.started"}
{"type":"error","message":"Reconnecting... 1/5 (stream disconnected before completion: Your authentication token has been invalidated. Please try signing in again.)"}
{"type":"error","message":"Reconnecting... 2/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 3/5 (stream disconnected before completion: Your authentication token has been invalidated. Please try signing in again.)"}
{"type":"error","message":"Reconnecting... 4/5 (stream disconnected before completion: Your authentication token has been invalidated. Please try signing in again.)"}
{"type":"error","message":"Reconnecting... 5/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"stream disconnected before completion: Your authentication token has been invalidated. Please try signing in again."}
{"type":"turn.failed","error":{"message":"stream disconnected before completion: Your authentication token has been invalidated. Please try signing in again."}}perl likely remains stuck in a busy-poll loop. The diagnosis was captured, but the patch proposal did not complete cleanly.
execution
/usr/bin/perl -wT /usr/sbin/munin-node --foregroundThe trace repeatedly returns to a poll-family syscall without meaningful blocking, which suggests a busy event-loop wakeup.
Thread 1 (Thread 0x7f82eb914b80 (LWP 3947104) "munin-node"):
#0 0x00007f82eb9e87d2 in ?? () from target:<path>
#1 0x00007f82eb9e87ed in ?? () from target:<path>
#2 0x00007f82eba686cf in select () from target:<path>
#3 0x000055b5551b8ee4 in ?? ()
#4 0x000055b55521a496 in Perl_runops_standard ()
#5 0x000055b555100b85 in perl_run ()
#6 0x000055b5550d35ae in main ()## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.## Plan Pass
## Workflow Note
{"type":"turn.started"}
{"type":"error","message":"Reconnecting... 1/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 2/5 (stream disconnected before completion: Your authentication token has been invalidated. Please try signing in again.)"}
{"type":"error","message":"Reconnecting... 3/5 (stream disconnected before completion: Your authentication token has been invalidated. Please try signing in again.)"}
{"type":"error","message":"Reconnecting... 4/5 (stream disconnected before completion: Your authentication token has been invalidated. Please try signing in again.)"}
{"type":"error","message":"Reconnecting... 5/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"We're currently experiencing high demand, which may cause temporary errors."}
{"type":"turn.failed","error":{"message":"We're currently experiencing high demand, which may cause temporary errors."}}perl likely remains stuck in a busy-poll loop. The diagnosis was captured, but the patch proposal did not complete cleanly.
execution
/usr/bin/perl -wT /usr/sbin/munin-node --foregroundThe trace repeatedly returns to a poll-family syscall without meaningful blocking, which suggests a busy event-loop wakeup.
Thread 1 (Thread 0x7f82eb914b80 (LWP 3947104) "munin-node"):
#0 0x00007f82eb9e87d2 in ?? () from target:<path>
#1 0x00007f82eb9e87ed in ?? () from target:<path>
#2 0x00007f82eba686cf in select () from target:<path>
#3 0x000055b5551b8ee4 in ?? ()
#4 0x000055b55521a496 in Perl_runops_standard ()
#5 0x000055b555100b85 in perl_run ()
#6 0x000055b5550d35ae in main ()## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.## Plan Pass
## Workflow Note
{"type":"turn.started"}
{"type":"error","message":"Reconnecting... 1/5 (stream disconnected before completion: Your authentication token has been invalidated. Please try signing in again.)"}
{"type":"error","message":"Reconnecting... 2/5 (stream disconnected before completion: Your authentication token has been invalidated. Please try signing in again.)"}
{"type":"error","message":"Reconnecting... 3/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 4/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 5/5 (stream disconnected before completion: Your authentication token has been invalidated. Please try signing in again.)"}
{"type":"error","message":"stream disconnected before completion: Your authentication token has been invalidated. Please try signing in again."}
{"type":"turn.failed","error":{"message":"stream disconnected before completion: Your authentication token has been invalidated. Please try signing in again."}}perl likely remains stuck in a busy-poll loop. The diagnosis was captured, but the patch proposal did not complete cleanly.
execution
/usr/bin/perl -wT /usr/sbin/munin-node --foregroundThe trace repeatedly returns to a poll-family syscall without meaningful blocking, which suggests a busy event-loop wakeup.
Thread 1 (Thread 0x7f82eb914b80 (LWP 3947104) "munin-node"):
#0 0x00007f82eb9e87d2 in ?? () from target:<path>
#1 0x00007f82eb9e87ed in ?? () from target:<path>
#2 0x00007f82eba686cf in select () from target:<path>
#3 0x000055b5551b8ee4 in ?? ()
#4 0x000055b55521a496 in Perl_runops_standard ()
#5 0x000055b555100b85 in perl_run ()
#6 0x000055b5550d35ae in main ()## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.## Plan Pass
## Workflow Note
{"type":"turn.started"}
{"type":"error","message":"Reconnecting... 1/5 (stream disconnected before completion: Your authentication token has been invalidated. Please try signing in again.)"}
{"type":"error","message":"Reconnecting... 2/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 3/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 4/5 (stream disconnected before completion: Your authentication token has been invalidated. Please try signing in again.)"}
{"type":"error","message":"Reconnecting... 5/5 (stream disconnected before completion: Your authentication token has been invalidated. Please try signing in again.)"}
{"type":"error","message":"We're currently experiencing high demand, which may cause temporary errors."}
{"type":"turn.failed","error":{"message":"We're currently experiencing high demand, which may cause temporary errors."}}perl likely remains stuck in a busy-poll loop. A diagnosis report and patch proposal were created locally.
## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.
## Patch Pass
You are working on a bounded fixer proposal.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Produce the smallest reasonable patch for the target repository, keep the change upstreamable, prefer the clearest control flow available, and do not keep avoidable `goto` when a simpler structure would read better. Before introducing new file, process, allocation, locking, networking, or platform APIs, inspect nearby code and project contribution docs for existing helpers or compatibility wrappers and use those local patterns unless you can explain why they do not fit. Validate from a reproducible workspace-root entrypoint before falling back to focused leaf commands; if a build or test cannot run, report the exact command, the exact blocker, and any narrower check you ran instead. During validation, also try one bounded independent reproduction of the collected failure signal when it is safe and cheap, such as a failing test, smoke command, perf/strace comparison, or before/after runtime check. Only use `reproduced` if that command or test actually reproduced the failure; otherwise keep `observed` and report the reproduction blocker. The final explanation must connect the observed issue evidence to the actual code change, not just paraphrase the diff. Write like a maintainer is going to read the patch mail cold: explain the bug in plain language, define subsystem-specific jargon the first time you need it, and make the causal story obvious. Explicitly classify evidence confidence as `reproduced`, `observed`, or `inferred`: `reproduced` means you reproduced the failure locally; `observed` means Fixer has direct crash/log/trace evidence but you did not independently reproduce it; `inferred` means the source patch is not pull-request-ready, so do not leave a source diff unless you first gather stronger observed/reproduced evidence; otherwise return a no-patch diagnosis/report. For any source-changing `observed` patch, say explicitly in `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. Security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior need reproduced evidence plus explicit security-impact analysis before leaving a source diff; otherwise return a no-patch diagnosis/report for human review. If you introduce non-obvious state translation, index remapping, or backend split logic, add a short source comment that explains the invariant being preserved.
Start by explaining the likely root cause from the collected perf, strace, and /proc evidence. If you cannot land a safe patch, leave a diagnosis that is strong enough for an upstream bug report.
Interpreter process expectation: when the hot process is Python, Perl, shell, Node, Ruby, PHP, Lua, or another interpreter, inspect both the runtime and the script/application entrypoint from `details.interpreter_process`. Prefer the script or application package when evidence points there; do not patch the interpreter runtime merely because the hot binary is `python`, `perl`, `bash`, or similar. Runtime fixes are welcome only after checking the entrypoint and explaining why the runtime mishandles the workload or why running bad code faster/safer is itself the right upstream fix.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Keep the change narrowly scoped and summarize validation clearly.
In every authoring pass, your final response must start with `Subject: <single-line git commit subject>` and then include these markdown sections exactly:
## Commit Message
A short upstream-friendly explanation of what changed and why. Write it in plain language that a maintainer can follow without local complaint context. If you use subsystem jargon, define it immediately.
## Evidence Confidence
Exactly one word: `reproduced`, `observed`, or `inferred`. Use `reproduced` only when you reproduced the failure locally with a command or test, and include that command/test in `## Validation`. Use `observed` when Fixer has direct crash/log/trace evidence but you did not independently reproduce it. If `## Git Add Paths` lists source files for an `observed` patch, `## Issue Connection` must explicitly say the failure was observed by Fixer and not independently reproduced. Security-sensitive source changes touching authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior require reproduced evidence and explicit security-impact analysis; otherwise list `None` under `## Git Add Paths` and write a no-patch diagnosis/report. Use `inferred` for profiler/strace/indirect evidence; inferred responses may be no-patch diagnoses or reports, but inferred source patches are not pull-request-ready until stronger evidence is gathered.
## Issue Connection
Write this as maintainer-facing patch mail, not as local Fixer notes. Cover four things explicitly in readable sentences: the user-visible symptom or the exact collected signal, the code-level cause or the cautious inference from evidence, the specific change you made, and the expected effect. Do not invent a reproducer, command line, crash, or user-visible failure that is not present in the evidence bundle. If the evidence is direct-but-not-reproduced, say it was observed by Fixer and not independently reproduced. If the evidence is indirect and you did not gather stronger evidence, do not leave a source diff; write a no-patch diagnosis/report instead. Include an explicit effect sentence such as `The expected effect is ...`, `This should reduce ...`, or `This prevents ...` for source patches. If the logic is non-obvious in code, mention that you added a short explanatory comment.
## Git Add Paths
List the repo-relative paths that belong in the final patch, one per line. Use `None` only when you intentionally made no source changes. Include intentionally new files, and do not list generated build artifacts.
## Validation
List the checks you ran, or say clearly that you could not run them. Include the independent reproduction command/test and result when `## Evidence Confidence` is `reproduced`; if reproduction was attempted but blocked, name the exact blocker and keep confidence at `observed` or `inferred`.
Before editing, read the plan at `./plan-output.txt` and follow it unless the code proves part of it wrong. If you change course, say so explicitly in the final write-up instead of silently drifting from the plan.
## Review Pass 1
You are reviewing a freshly generated fixer patch.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Review the first patch pass. The original pre-edit snapshot is available at `./source` for diffing.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout. The latest author response is at `./patch-output.txt`. Inspect the current code and changed paths like a strict code reviewer. Focus on correctness, regressions, maintainability, awkward control flow such as avoidable `goto`, missing validation, weak or non-gittable commit message text, and explanations that fail to connect the observed issue evidence to the code change. Also review the maintainer experience: the patch mail should be easy to accept upstream, the user-visible bug should be explained in plain language, subsystem-specific jargon should be defined when first used, and any non-obvious state translation or index remapping in code should have a short explanatory comment. Reject patches that omit `## Evidence Confidence`, use anything other than `reproduced`, `observed`, or `inferred`, or sound more certain than that evidence level allows. Reject patches that claim `reproduced` unless `## Validation` names the concrete reproduction command or test and its result. Reject source patches in security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior unless the author reproduced the behavior and explicitly analyzed the security impact of the change; observed-only evidence should become a diagnosis/report, not a PR-ready source diff. Reject patches that invent a reproducer, command line, crash, or user-visible failure not present in the evidence bundle; indirect profiler or strace evidence may justify a cautious mitigation, but the author must say it is indirect instead of presenting it as a confirmed upstream bug. Reject patches that introduce generic libc/std APIs when nearby code or project docs provide a local compat/helper API for the same job, unless the author explicitly justifies the exception. Reject validation that only reports a leaf object/syntax build when a project-level configure/build/test entrypoint exists and was not attempted; if a full build cannot run, the author must show the exact failed command and blocker.
Do not apply code changes in this pass.
Return a short markdown review report. The first non-empty line must be exactly one of:
RESULT: ok
RESULT: fix-needed
If you choose `RESULT: fix-needed`, add a `## Findings` section with concrete, actionable items.## Plan Pass
## Problem
Fixer observed `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` in `select()`/`pselect6`, but the retained strace excerpt shows blocking waits of about 1.8s and 2.0s, process state `S (sleeping)`, and only 0.9% CPU. That is consistent with an idle `munin-node` listener rather than a proven runaway loop.
## Evidence Confidence
inferred
## Proposed Subject
No source patch yet: diagnose the report as insufficient for an upstream Munin fix unless a bounded reproduction shows `munin-node` waking without work.
## Patch Plan
Do not edit Munin in this pass. The evidence lacks a Perl-level stack and does not tie the sampled `select()` to Munin application logic; `script/munin-node` delegates the listener to `Munin::Node::Server->run`, which subclasses `Net::Server::Fork`.
If new evidence does reproduce a real busy wakeup, investigate in this order: `script/munin-node`, `lib/Munin/Node/Server.pm`, then `Net::Server::Fork` only if Munin inputs/configuration are excluded. Follow Munin conventions from `CONTRIBUTING.md` and `HACKING.pod`: strict/warnings, taint-mode compatibility, existing indentation style, and no Perl warnings. Relevant local helpers found: `Munin::Common::Timeout::do_with_timeout`, `Munin::Node::OS->run_as_child`, and `Munin::Common::Logger`; no Munin-owned accept/poll wrapper was found because the daemon loop is owned by `Net::Server`.
No prior Fixer patch was found in this workspace. If a later patch is justified, use a small guard or bounded return path; do not introduce avoidable `goto` control flow.
## Risks
A source change based only on the current bundle would risk altering normal daemon idle behavior, connection handling, or timeout behavior without a demonstrated defect. This area is security-adjacent because `munin-node` runs as a service and handles network clients, so changes to listener timing or request handling need reproduced behavior and impact analysis first.
## Validation
Before any focused check, try the project entrypoints from the workspace root: `make`, then `make test` because this Makefile has `test` but no `check` target.
Bounded independent reproduction attempt before any source patch: run `munin-node` from the checkout in foreground under `strace` with a test/minimal config and verify whether `pselect6`/`select` returns immediately in a tight loop or blocks for real time. A patch should not claim `reproduced` unless that command shows rapid wakeups without client traffic; otherwise final reporting should state the Fixer signal was profiler-only/indirect and not independently reproduced.
## Patch Pass
Subject: Diagnose munin-node select profile as inconclusive
## Commit Message
The likely root cause of the collected signal is an idle `munin-node` listener waiting in `select`, not a proven busy loop. Fixer’s strace sample showed only three `pselect6` calls over five seconds, each blocking for about two seconds, while `/proc` showed the process sleeping in `poll_schedule_timeout` with about 0.9% CPU.
No source change is proposed. The evidence does not tie the profile to a Munin application bug or to a Perl runtime bug.
## Evidence Confidence
inferred
## Issue Connection
Fixer collected a native Perl backtrace under `/usr/sbin/munin-node --foreground` with frames in `select()`/`pselect6`, plus a perf profile labeling the process as a likely busy poll loop. The same bundle also shows the process in sleeping state, waiting in `poll_schedule_timeout`, with `pselect6` calls that block for roughly 1.8 to 2.0 seconds rather than returning immediately.
The cautious code-level inference is that `munin-node` was probably idle in its listener loop. The Perl entrypoint `script/munin-node` delegates the daemon loop to `Munin::Node::Server`, which subclasses `Net::Server::Fork`; Munin’s local timeout and process helpers, such as `Munin::Common::Timeout::do_with_timeout`, `Munin::Node::OS->run_as_child`, and `Munin::Common::Logger`, are used around request/plugin handling rather than the accept/poll loop itself. I also inspected the Perl entrypoint before considering the runtime; the evidence does not justify a Perl runtime patch.
The specific change made is none. This follows the saved plan: without a reproduced rapid wakeup or a Perl-level stack tying the wait to Munin logic, a source patch would be speculative. The expected effect is no behavior change and a stronger upstream report: the current evidence is not pull-request-ready for a Munin code change.
## Git Add Paths
None
## Validation
`make -n check` failed because there is no `check` target: `make: *** No rule to make target 'check'. Stop.`
`make` failed at the workspace root because `Module::Build` is missing: `Can't locate Module/Build.pm in @INC ... at Build.PL line 80`.
`make test` failed for the same `Module::Build` blocker at `Build.PL line 80`.
Focused checks run after the project-level blocker:
`perl -T -c -Ilib script/munin-node` passed.
`perl -c -Ilib lib/Munin/Node/Server.pm` passed.
`perl -c -Ilib lib/Munin/Common/Timeout.pm` passed.
`perl -c -Ilib lib/Munin/Node/OS.pm` passed with existing redefinition warnings.
Independent reproduction was attempted but blocked. `strace -ttT -f ... /usr/bin/perl -T -Ilib script/munin-node ...` failed with `PTRACE_TRACEME: Operation not permitted` and `ptrace(PTRACE_SEIZE, 7): Operation not permitted`. A non-strace foreground smoke run also could not reach the idle listener state because binding a temporary TCP port failed with `Cannot bind and listen to TCP port 49490 on 127.0.0.1 [Operation not permitted]`. Therefore the failure was not independently reproduced.
## Review Pass 1
RESULT: ok
The first pass leaves no source diff, which matches the evidence level. The bundle is indirect/profiler-heavy and internally points away from a proven busy loop: sleeping process state, `poll_schedule_timeout`, low CPU, and blocking `pselect6` calls around two seconds.
The response includes `## Evidence Confidence` with `inferred`, lists `Git Add Paths` as `None`, does not claim a reproduced failure, and reports the project-level validation blockers before focused syntax checks. It also names the relevant Munin conventions and helpers (`do_with_timeout`, `Munin::Node::OS->run_as_child`, `Munin::Common::Logger`) and correctly avoids patching Perl just because the hot executable is `/usr/bin/perl`.
No correctness, maintainability, evidence, or validation issue requires another patch pass.perl likely remains stuck in a busy-poll loop. A diagnosis report and patch proposal were created locally.
## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.
## Patch Pass
You are working on a bounded fixer proposal.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Produce the smallest reasonable patch for the target repository, keep the change upstreamable, prefer the clearest control flow available, and do not keep avoidable `goto` when a simpler structure would read better. Before introducing new file, process, allocation, locking, networking, or platform APIs, inspect nearby code and project contribution docs for existing helpers or compatibility wrappers and use those local patterns unless you can explain why they do not fit. Validate from a reproducible workspace-root entrypoint before falling back to focused leaf commands; if a build or test cannot run, report the exact command, the exact blocker, and any narrower check you ran instead. During validation, also try one bounded independent reproduction of the collected failure signal when it is safe and cheap, such as a failing test, smoke command, perf/strace comparison, or before/after runtime check. Only use `reproduced` if that command or test actually reproduced the failure; otherwise keep `observed` and report the reproduction blocker. The final explanation must connect the observed issue evidence to the actual code change, not just paraphrase the diff. Write like a maintainer is going to read the patch mail cold: explain the bug in plain language, define subsystem-specific jargon the first time you need it, and make the causal story obvious. Explicitly classify evidence confidence as `reproduced`, `observed`, or `inferred`: `reproduced` means you reproduced the failure locally; `observed` means Fixer has direct crash/log/trace evidence but you did not independently reproduce it; `inferred` means the source patch is not pull-request-ready, so do not leave a source diff unless you first gather stronger observed/reproduced evidence; otherwise return a no-patch diagnosis/report. For any source-changing `observed` patch, say explicitly in `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. Security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior need reproduced evidence plus explicit security-impact analysis before leaving a source diff; otherwise return a no-patch diagnosis/report for human review. If you introduce non-obvious state translation, index remapping, or backend split logic, add a short source comment that explains the invariant being preserved.
Start by explaining the likely root cause from the collected perf, strace, and /proc evidence. If you cannot land a safe patch, leave a diagnosis that is strong enough for an upstream bug report.
Interpreter process expectation: when the hot process is Python, Perl, shell, Node, Ruby, PHP, Lua, or another interpreter, inspect both the runtime and the script/application entrypoint from `details.interpreter_process`. Prefer the script or application package when evidence points there; do not patch the interpreter runtime merely because the hot binary is `python`, `perl`, `bash`, or similar. Runtime fixes are welcome only after checking the entrypoint and explaining why the runtime mishandles the workload or why running bad code faster/safer is itself the right upstream fix.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Keep the change narrowly scoped and summarize validation clearly.
In every authoring pass, your final response must start with `Subject: <single-line git commit subject>` and then include these markdown sections exactly:
## Commit Message
A short upstream-friendly explanation of what changed and why. Write it in plain language that a maintainer can follow without local complaint context. If you use subsystem jargon, define it immediately.
## Evidence Confidence
Exactly one word: `reproduced`, `observed`, or `inferred`. Use `reproduced` only when you reproduced the failure locally with a command or test, and include that command/test in `## Validation`. Use `observed` when Fixer has direct crash/log/trace evidence but you did not independently reproduce it. If `## Git Add Paths` lists source files for an `observed` patch, `## Issue Connection` must explicitly say the failure was observed by Fixer and not independently reproduced. Security-sensitive source changes touching authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior require reproduced evidence and explicit security-impact analysis; otherwise list `None` under `## Git Add Paths` and write a no-patch diagnosis/report. Use `inferred` for profiler/strace/indirect evidence; inferred responses may be no-patch diagnoses or reports, but inferred source patches are not pull-request-ready until stronger evidence is gathered.
## Issue Connection
Write this as maintainer-facing patch mail, not as local Fixer notes. Cover four things explicitly in readable sentences: the user-visible symptom or the exact collected signal, the code-level cause or the cautious inference from evidence, the specific change you made, and the expected effect. Do not invent a reproducer, command line, crash, or user-visible failure that is not present in the evidence bundle. If the evidence is direct-but-not-reproduced, say it was observed by Fixer and not independently reproduced. If the evidence is indirect and you did not gather stronger evidence, do not leave a source diff; write a no-patch diagnosis/report instead. Include an explicit effect sentence such as `The expected effect is ...`, `This should reduce ...`, or `This prevents ...` for source patches. If the logic is non-obvious in code, mention that you added a short explanatory comment.
## Git Add Paths
List the repo-relative paths that belong in the final patch, one per line. Use `None` only when you intentionally made no source changes. Include intentionally new files, and do not list generated build artifacts.
## Validation
List the checks you ran, or say clearly that you could not run them. Include the independent reproduction command/test and result when `## Evidence Confidence` is `reproduced`; if reproduction was attempted but blocked, name the exact blocker and keep confidence at `observed` or `inferred`.
Before editing, read the plan at `./plan-output.txt` and follow it unless the code proves part of it wrong. If you change course, say so explicitly in the final write-up instead of silently drifting from the plan.
## Review Pass 1
You are reviewing a freshly generated fixer patch.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Review the first patch pass. The original pre-edit snapshot is available at `./source` for diffing.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout. The latest author response is at `./patch-output.txt`. Inspect the current code and changed paths like a strict code reviewer. Focus on correctness, regressions, maintainability, awkward control flow such as avoidable `goto`, missing validation, weak or non-gittable commit message text, and explanations that fail to connect the observed issue evidence to the code change. Also review the maintainer experience: the patch mail should be easy to accept upstream, the user-visible bug should be explained in plain language, subsystem-specific jargon should be defined when first used, and any non-obvious state translation or index remapping in code should have a short explanatory comment. Reject patches that omit `## Evidence Confidence`, use anything other than `reproduced`, `observed`, or `inferred`, or sound more certain than that evidence level allows. Reject patches that claim `reproduced` unless `## Validation` names the concrete reproduction command or test and its result. Reject source patches in security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior unless the author reproduced the behavior and explicitly analyzed the security impact of the change; observed-only evidence should become a diagnosis/report, not a PR-ready source diff. Reject patches that invent a reproducer, command line, crash, or user-visible failure not present in the evidence bundle; indirect profiler or strace evidence may justify a cautious mitigation, but the author must say it is indirect instead of presenting it as a confirmed upstream bug. Reject patches that introduce generic libc/std APIs when nearby code or project docs provide a local compat/helper API for the same job, unless the author explicitly justifies the exception. Reject validation that only reports a leaf object/syntax build when a project-level configure/build/test entrypoint exists and was not attempted; if a full build cannot run, the author must show the exact failed command and blocker.
Do not apply code changes in this pass.
Return a short markdown review report. The first non-empty line must be exactly one of:
RESULT: ok
RESULT: fix-needed
If you choose `RESULT: fix-needed`, add a `## Findings` section with concrete, actionable items.## Plan Pass
## Problem
Fixer observed `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` in `select()`/`pselect6`, but the retained strace excerpt shows blocking waits of about 1.8s and 2.0s, process state `S (sleeping)`, and only 0.9% CPU. That is consistent with an idle `munin-node` listener rather than a proven runaway loop.
## Evidence Confidence
inferred
## Proposed Subject
No source patch yet: diagnose the report as insufficient for an upstream Munin fix unless a bounded reproduction shows `munin-node` waking without work.
## Patch Plan
Do not edit Munin in this pass. The evidence lacks a Perl-level stack and does not tie the sampled `select()` to Munin application logic; `script/munin-node` delegates the listener to `Munin::Node::Server->run`, which subclasses `Net::Server::Fork`.
If new evidence does reproduce a real busy wakeup, investigate in this order: `script/munin-node`, `lib/Munin/Node/Server.pm`, then `Net::Server::Fork` only if Munin inputs/configuration are excluded. Follow Munin conventions from `CONTRIBUTING.md` and `HACKING.pod`: strict/warnings, taint-mode compatibility, existing indentation style, and no Perl warnings. Relevant local helpers found: `Munin::Common::Timeout::do_with_timeout`, `Munin::Node::OS->run_as_child`, and `Munin::Common::Logger`; no Munin-owned accept/poll wrapper was found because the daemon loop is owned by `Net::Server`.
No prior Fixer patch was found in this workspace. If a later patch is justified, use a small guard or bounded return path; do not introduce avoidable `goto` control flow.
## Risks
A source change based only on the current bundle would risk altering normal daemon idle behavior, connection handling, or timeout behavior without a demonstrated defect. This area is security-adjacent because `munin-node` runs as a service and handles network clients, so changes to listener timing or request handling need reproduced behavior and impact analysis first.
## Validation
Before any focused check, try the project entrypoints from the workspace root: `make`, then `make test` because this Makefile has `test` but no `check` target.
Bounded independent reproduction attempt before any source patch: run `munin-node` from the checkout in foreground under `strace` with a test/minimal config and verify whether `pselect6`/`select` returns immediately in a tight loop or blocks for real time. A patch should not claim `reproduced` unless that command shows rapid wakeups without client traffic; otherwise final reporting should state the Fixer signal was profiler-only/indirect and not independently reproduced.
## Patch Pass
Subject: Diagnose munin-node select profile as inconclusive
## Commit Message
The likely root cause of the collected signal is an idle `munin-node` listener waiting in `select`, not a proven busy loop. Fixer’s strace sample showed only three `pselect6` calls over five seconds, each blocking for about two seconds, while `/proc` showed the process sleeping in `poll_schedule_timeout` with about 0.9% CPU.
No source change is proposed. The evidence does not tie the profile to a Munin application bug or to a Perl runtime bug.
## Evidence Confidence
inferred
## Issue Connection
Fixer collected a native Perl backtrace under `/usr/sbin/munin-node --foreground` with frames in `select()`/`pselect6`, plus a perf profile labeling the process as a likely busy poll loop. The same bundle also shows the process in sleeping state, waiting in `poll_schedule_timeout`, with `pselect6` calls that block for roughly 1.8 to 2.0 seconds rather than returning immediately.
The cautious code-level inference is that `munin-node` was probably idle in its listener loop. The Perl entrypoint `script/munin-node` delegates the daemon loop to `Munin::Node::Server`, which subclasses `Net::Server::Fork`; Munin’s local timeout and process helpers, such as `Munin::Common::Timeout::do_with_timeout`, `Munin::Node::OS->run_as_child`, and `Munin::Common::Logger`, are used around request/plugin handling rather than the accept/poll loop itself. I also inspected the Perl entrypoint before considering the runtime; the evidence does not justify a Perl runtime patch.
The specific change made is none. This follows the saved plan: without a reproduced rapid wakeup or a Perl-level stack tying the wait to Munin logic, a source patch would be speculative. The expected effect is no behavior change and a stronger upstream report: the current evidence is not pull-request-ready for a Munin code change.
## Git Add Paths
None
## Validation
`make -n check` failed because there is no `check` target: `make: *** No rule to make target 'check'. Stop.`
`make` failed at the workspace root because `Module::Build` is missing: `Can't locate Module/Build.pm in @INC ... at Build.PL line 80`.
`make test` failed for the same `Module::Build` blocker at `Build.PL line 80`.
Focused checks run after the project-level blocker:
`perl -T -c -Ilib script/munin-node` passed.
`perl -c -Ilib lib/Munin/Node/Server.pm` passed.
`perl -c -Ilib lib/Munin/Common/Timeout.pm` passed.
`perl -c -Ilib lib/Munin/Node/OS.pm` passed with existing redefinition warnings.
Independent reproduction was attempted but blocked. `strace -ttT -f ... /usr/bin/perl -T -Ilib script/munin-node ...` failed with `PTRACE_TRACEME: Operation not permitted` and `ptrace(PTRACE_SEIZE, 7): Operation not permitted`. A non-strace foreground smoke run also could not reach the idle listener state because binding a temporary TCP port failed with `Cannot bind and listen to TCP port 49490 on 127.0.0.1 [Operation not permitted]`. Therefore the failure was not independently reproduced.
## Review Pass 1
RESULT: ok
The first pass leaves no source diff, which matches the evidence level. The bundle is indirect/profiler-heavy and internally points away from a proven busy loop: sleeping process state, `poll_schedule_timeout`, low CPU, and blocking `pselect6` calls around two seconds.
The response includes `## Evidence Confidence` with `inferred`, lists `Git Add Paths` as `None`, does not claim a reproduced failure, and reports the project-level validation blockers before focused syntax checks. It also names the relevant Munin conventions and helpers (`do_with_timeout`, `Munin::Node::OS->run_as_child`, `Munin::Common::Logger`) and correctly avoids patching Perl just because the hot executable is `/usr/bin/perl`.
No correctness, maintainability, evidence, or validation issue requires another patch pass.perl likely remains stuck in a busy-poll loop. The diagnosis was captured, but the patch proposal did not complete cleanly.
execution
/usr/bin/perl -wT /usr/sbin/munin-node --foregroundThe trace repeatedly returns to a poll-family syscall without meaningful blocking, which suggests a busy event-loop wakeup.
Thread 1 (Thread 0x7f82eb914b80 (LWP 3947104) "munin-node"):
#0 0x00007f82eb9e87d2 in ?? () from target:<path>
#1 0x00007f82eb9e87ed in ?? () from target:<path>
#2 0x00007f82eba686cf in select () from target:<path>
#3 0x000055b5551b8ee4 in ?? ()
#4 0x000055b55521a496 in Perl_runops_standard ()
#5 0x000055b555100b85 in perl_run ()
#6 0x000055b5550d35ae in main ()## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.## Plan Pass
## Workflow Note
{"type":"turn.started"}
{"type":"error","message":"Reconnecting... 1/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 2/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 3/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 4/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 5/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"We're currently experiencing high demand, which may cause temporary errors."}
{"type":"turn.failed","error":{"message":"We're currently experiencing high demand, which may cause temporary errors."}}perl likely remains stuck in a busy-poll loop. The diagnosis was captured, but the patch proposal did not complete cleanly.
execution
/usr/bin/perl -wT /usr/sbin/munin-node --foregroundThe trace repeatedly returns to a poll-family syscall without meaningful blocking, which suggests a busy event-loop wakeup.
Thread 1 (Thread 0x7f82eb914b80 (LWP 3947104) "munin-node"):
#0 0x00007f82eb9e87d2 in ?? () from target:<path>
#1 0x00007f82eb9e87ed in ?? () from target:<path>
#2 0x00007f82eba686cf in select () from target:<path>
#3 0x000055b5551b8ee4 in ?? ()
#4 0x000055b55521a496 in Perl_runops_standard ()
#5 0x000055b555100b85 in perl_run ()
#6 0x000055b5550d35ae in main ()## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.## Plan Pass
## Workflow Note
{"type":"turn.started"}
{"type":"error","message":"Reconnecting... 1/5 (stream disconnected before completion: Your authentication token has been invalidated. Please try signing in again.)"}
{"type":"error","message":"Reconnecting... 2/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 3/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 4/5 (stream disconnected before completion: Your authentication token has been invalidated. Please try signing in again.)"}
{"type":"error","message":"Reconnecting... 5/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"We're currently experiencing high demand, which may cause temporary errors."}
{"type":"turn.failed","error":{"message":"We're currently experiencing high demand, which may cause temporary errors."}}perl likely remains stuck in a busy-poll loop. The diagnosis was captured, but the patch proposal did not complete cleanly.
execution
/usr/bin/perl -wT /usr/sbin/munin-node --foregroundThe trace repeatedly returns to a poll-family syscall without meaningful blocking, which suggests a busy event-loop wakeup.
Thread 1 (Thread 0x7f82eb914b80 (LWP 3947104) "munin-node"):
#0 0x00007f82eb9e87d2 in ?? () from target:<path>
#1 0x00007f82eb9e87ed in ?? () from target:<path>
#2 0x00007f82eba686cf in select () from target:<path>
#3 0x000055b5551b8ee4 in ?? ()
#4 0x000055b55521a496 in Perl_runops_standard ()
#5 0x000055b555100b85 in perl_run ()
#6 0x000055b5550d35ae in main ()## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.## Plan Pass
## Workflow Note
{"type":"turn.started"}
{"type":"error","message":"Reconnecting... 1/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 2/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 3/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 4/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 5/5 (stream disconnected before completion: Your authentication token has been invalidated. Please try signing in again.)"}
{"type":"error","message":"We're currently experiencing high demand, which may cause temporary errors."}
{"type":"turn.failed","error":{"message":"We're currently experiencing high demand, which may cause temporary errors."}}perl likely remains stuck in a busy-poll loop. The diagnosis was captured, but the patch proposal did not complete cleanly.
execution
/usr/bin/perl -wT /usr/sbin/munin-node --foregroundThe trace repeatedly returns to a poll-family syscall without meaningful blocking, which suggests a busy event-loop wakeup.
Thread 1 (Thread 0x7f82eb914b80 (LWP 3947104) "munin-node"):
#0 0x00007f82eb9e87d2 in ?? () from target:<path>
#1 0x00007f82eb9e87ed in ?? () from target:<path>
#2 0x00007f82eba686cf in select () from target:<path>
#3 0x000055b5551b8ee4 in ?? ()
#4 0x000055b55521a496 in Perl_runops_standard ()
#5 0x000055b555100b85 in perl_run ()
#6 0x000055b5550d35ae in main ()## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.## Plan Pass
## Workflow Note
{"type":"turn.started"}
{"type":"error","message":"Reconnecting... 1/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 2/5 (stream disconnected before completion: Your authentication token has been invalidated. Please try signing in again.)"}
{"type":"error","message":"Reconnecting... 3/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 4/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 5/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"We're currently experiencing high demand, which may cause temporary errors."}
{"type":"turn.failed","error":{"message":"We're currently experiencing high demand, which may cause temporary errors."}}perl likely remains stuck in a busy-poll loop. A diagnosis report and patch proposal were created locally.
## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.
## Patch Pass
You are working on a bounded fixer proposal.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Produce the smallest reasonable patch for the target repository, keep the change upstreamable, prefer the clearest control flow available, and do not keep avoidable `goto` when a simpler structure would read better. Before introducing new file, process, allocation, locking, networking, or platform APIs, inspect nearby code and project contribution docs for existing helpers or compatibility wrappers and use those local patterns unless you can explain why they do not fit. Validate from a reproducible workspace-root entrypoint before falling back to focused leaf commands; if a build or test cannot run, report the exact command, the exact blocker, and any narrower check you ran instead. During validation, also try one bounded independent reproduction of the collected failure signal when it is safe and cheap, such as a failing test, smoke command, perf/strace comparison, or before/after runtime check. Only use `reproduced` if that command or test actually reproduced the failure; otherwise keep `observed` and report the reproduction blocker. The final explanation must connect the observed issue evidence to the actual code change, not just paraphrase the diff. Write like a maintainer is going to read the patch mail cold: explain the bug in plain language, define subsystem-specific jargon the first time you need it, and make the causal story obvious. Explicitly classify evidence confidence as `reproduced`, `observed`, or `inferred`: `reproduced` means you reproduced the failure locally; `observed` means Fixer has direct crash/log/trace evidence but you did not independently reproduce it; `inferred` means the source patch is not pull-request-ready, so do not leave a source diff unless you first gather stronger observed/reproduced evidence; otherwise return a no-patch diagnosis/report. For any source-changing `observed` patch, say explicitly in `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. Security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior need reproduced evidence plus explicit security-impact analysis before leaving a source diff; otherwise return a no-patch diagnosis/report for human review. If you introduce non-obvious state translation, index remapping, or backend split logic, add a short source comment that explains the invariant being preserved.
Start by explaining the likely root cause from the collected perf, strace, and /proc evidence. If you cannot land a safe patch, leave a diagnosis that is strong enough for an upstream bug report.
Interpreter process expectation: when the hot process is Python, Perl, shell, Node, Ruby, PHP, Lua, or another interpreter, inspect both the runtime and the script/application entrypoint from `details.interpreter_process`. Prefer the script or application package when evidence points there; do not patch the interpreter runtime merely because the hot binary is `python`, `perl`, `bash`, or similar. Runtime fixes are welcome only after checking the entrypoint and explaining why the runtime mishandles the workload or why running bad code faster/safer is itself the right upstream fix.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Keep the change narrowly scoped and summarize validation clearly.
In every authoring pass, your final response must start with `Subject: <single-line git commit subject>` and then include these markdown sections exactly:
## Commit Message
A short upstream-friendly explanation of what changed and why. Write it in plain language that a maintainer can follow without local complaint context. If you use subsystem jargon, define it immediately.
## Evidence Confidence
Exactly one word: `reproduced`, `observed`, or `inferred`. Use `reproduced` only when you reproduced the failure locally with a command or test, and include that command/test in `## Validation`. Use `observed` when Fixer has direct crash/log/trace evidence but you did not independently reproduce it. If `## Git Add Paths` lists source files for an `observed` patch, `## Issue Connection` must explicitly say the failure was observed by Fixer and not independently reproduced. Security-sensitive source changes touching authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior require reproduced evidence and explicit security-impact analysis; otherwise list `None` under `## Git Add Paths` and write a no-patch diagnosis/report. Use `inferred` for profiler/strace/indirect evidence; inferred responses may be no-patch diagnoses or reports, but inferred source patches are not pull-request-ready until stronger evidence is gathered.
## Issue Connection
Write this as maintainer-facing patch mail, not as local Fixer notes. Cover four things explicitly in readable sentences: the user-visible symptom or the exact collected signal, the code-level cause or the cautious inference from evidence, the specific change you made, and the expected effect. Do not invent a reproducer, command line, crash, or user-visible failure that is not present in the evidence bundle. If the evidence is direct-but-not-reproduced, say it was observed by Fixer and not independently reproduced. If the evidence is indirect and you did not gather stronger evidence, do not leave a source diff; write a no-patch diagnosis/report instead. Include an explicit effect sentence such as `The expected effect is ...`, `This should reduce ...`, or `This prevents ...` for source patches. If the logic is non-obvious in code, mention that you added a short explanatory comment.
## Git Add Paths
List the repo-relative paths that belong in the final patch, one per line. Use `None` only when you intentionally made no source changes. Include intentionally new files, and do not list generated build artifacts.
## Validation
List the checks you ran, or say clearly that you could not run them. Include the independent reproduction command/test and result when `## Evidence Confidence` is `reproduced`; if reproduction was attempted but blocked, name the exact blocker and keep confidence at `observed` or `inferred`.
Before editing, read the plan at `./plan-output.txt` and follow it unless the code proves part of it wrong. If you change course, say so explicitly in the final write-up instead of silently drifting from the plan.
## Review Pass 1
You are reviewing a freshly generated fixer patch.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Review the first patch pass. The original pre-edit snapshot is available at `./source` for diffing.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout. The latest author response is at `./patch-output.txt`. Inspect the current code and changed paths like a strict code reviewer. Focus on correctness, regressions, maintainability, awkward control flow such as avoidable `goto`, missing validation, weak or non-gittable commit message text, and explanations that fail to connect the observed issue evidence to the code change. Also review the maintainer experience: the patch mail should be easy to accept upstream, the user-visible bug should be explained in plain language, subsystem-specific jargon should be defined when first used, and any non-obvious state translation or index remapping in code should have a short explanatory comment. Reject patches that omit `## Evidence Confidence`, use anything other than `reproduced`, `observed`, or `inferred`, or sound more certain than that evidence level allows. Reject patches that claim `reproduced` unless `## Validation` names the concrete reproduction command or test and its result. Reject source patches in security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior unless the author reproduced the behavior and explicitly analyzed the security impact of the change; observed-only evidence should become a diagnosis/report, not a PR-ready source diff. Reject patches that invent a reproducer, command line, crash, or user-visible failure not present in the evidence bundle; indirect profiler or strace evidence may justify a cautious mitigation, but the author must say it is indirect instead of presenting it as a confirmed upstream bug. Reject patches that introduce generic libc/std APIs when nearby code or project docs provide a local compat/helper API for the same job, unless the author explicitly justifies the exception. Reject validation that only reports a leaf object/syntax build when a project-level configure/build/test entrypoint exists and was not attempted; if a full build cannot run, the author must show the exact failed command and blocker.
Do not apply code changes in this pass.
Return a short markdown review report. The first non-empty line must be exactly one of:
RESULT: ok
RESULT: fix-needed
If you choose `RESULT: fix-needed`, add a `## Findings` section with concrete, actionable items.## Plan Pass
## Problem
Fixer observed `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` in repeated `pselect6` frames and labeled it a likely busy poll loop. The retained evidence does not include a Perl-level stack or script line, and the visible `strace` samples block for about 1.8 to 2.0 seconds with the process in `S (sleeping)` and only 0.9% CPU. That looks like munin-node/Net::Server idle polling, not a proven runaway loop.
## Evidence Confidence
observed
## Proposed Subject
No source patch yet: diagnose the Fixer signal as insufficient for an upstream munin change unless an independent reproduction shows short/zero-timeout polling or elevated CPU.
## Patch Plan
1. Do not edit in this pass, and do not patch Perl runtime code unless the application entrypoint is ruled out.
2. Treat `script/munin-node` and `lib/Munin/Node/Server.pm` as the first investigation targets. The entrypoint delegates to `Munin::Node::Server->run`, which subclasses `Net::Server::Fork`.
3. Treat `lib/Munin/Node/OS.pm` and `lib/Munin/Node/Service.pm` as secondary targets only if reproduction points at plugin child IO. Their local helper path is `Munin::Node::OS->run_as_child`, using `Munin::Common::Timeout::do_with_timeout`; logging convention is `Munin::Common::Logger`.
4. Follow maintainer conventions from `CONTRIBUTING.md` and `HACKING.pod`: taint-mode Perl, `strict`/`warnings`, English variable names where practical, one statement per line, match local indentation, and avoid awkward control flow such as avoidable `goto`.
5. If a real tight poll is reproduced, patch the narrow owning helper rather than adding Debian-local workarounds. If the loop is in Net::Server idle accept behavior with blocking 2-second waits, report no upstream munin source change.
6. No prior Fixer patch or workspace diff was found to improve or replace.
## Risks
A source patch based only on the current evidence would likely fix a speculative issue. Changing daemon polling, timeout, or request-loop behavior could affect connection handling, plugin timeouts, or process reaping without a demonstrated benefit. This is not security-sensitive as currently scoped.
## Validation
From the workspace root, first try the project-level entrypoints: `make`, then `make test` because this Makefile has `test` and no `check` target. If those fail from missing dependencies or generated files, record the exact command and failure reason.
Bounded independent reproduction attempt before any patch: run munin-node from the script entrypoint with a temporary minimal config/plugin directory under `/tmp`, trace `select`/`pselect6` for a few seconds, and verify whether calls block for roughly the Net::Server idle interval or spin with near-zero timeouts. Only claim `reproduced` if that command actually shows the failure signal.
## Patch Pass
Subject: No patch: diagnose munin-node idle select trace
## Commit Message
No source change is included. The collected evidence points to `munin-node` sleeping in a poll-family syscall, not to a proven busy loop in Munin or Perl. The visible `pselect6` calls block for about two seconds, the process state is `S (sleeping)`, and sampled CPU is low, so an upstream patch would be speculative without a Perl-level stack or a local reproduction.
## Evidence Confidence
inferred
## Issue Connection
Fixer collected perf, strace, and `/proc` evidence for `/usr/bin/perl -wT /usr/sbin/munin-node --foreground`: native frames were under Perl and `select`, with repeated `pselect6` syscalls. The important detail is that the retained `strace` lines show timeouts of about 1.8 to 2.0 seconds, and `/proc` reported the process as sleeping with about 0.9% CPU.
The cautious code-level inference is that this is probably munin-node’s normal idle server loop through `Munin::Node::Server`, which subclasses `Net::Server::Fork`, rather than a tight application loop. I inspected the script entrypoint first, per the interpreter-process evidence, and did not find a Munin-owned select loop matching the observed idle `pselect6` cadence. The nearby local helpers are `Munin::Node::OS->run_as_child` for plugin subprocess handling, `Munin::Common::Timeout::do_with_timeout` for bounded plugin/request work, and `Munin::Common::Logger` for logging; none fit a safe source change for the observed idle server wait.
I made no code change. The expected effect is that this proposal avoids landing an upstream patch for a profiler-only signal that currently looks like normal blocking behavior, and leaves a diagnosis suitable for an upstream report if stronger evidence is collected later. This follows the saved plan; no course change was needed.
## Git Add Paths
None
## Validation
`make` from the workspace root failed before build: `Can't locate Module/Build.pm in @INC ... at Build.PL line 80`, followed by `make: *** [Makefile:149: Build] Error 2`.
`make test` failed for the same blocker: `Can't locate Module/Build.pm in @INC ... at Build.PL line 80`, followed by `make: *** [Makefile:149: Build] Error 2`.
`make check` was not available in the Makefile; the project-level test target is `make test`.
Focused checks run after the project-level blocker:
`perl -T -Ilib -c script/munin-node` passed.
`perl -Ilib -c lib/Munin/Node/Server.pm` passed.
`perl -Ilib -c lib/Munin/Node/OS.pm` passed syntax, with redefinition warnings from the module load cycle.
Independent reproduction was attempted but blocked. `strace` failed with `PTRACE_TRACEME: Operation not permitted` and `ptrace(PTRACE_SEIZE, 6): Operation not permitted`. A fallback smoke run of `munin-node` with a temporary config failed before idling because Net::Server could not bind `127.0.0.1:14949`: `Operation not permitted`.
## Review Pass 1
RESULT: ok
No source diff is present against the original snapshot, and the author correctly treated the profiler/strace evidence as insufficient for a PR-ready Munin source patch.
The report includes a valid `## Evidence Confidence` value (`inferred`), does not claim local reproduction, and explains why the retained `pselect6` waits, sleeping process state, and low CPU do not prove a busy loop. It also names the relevant local subsystem/helpers (`Munin::Node::Server`, `Net::Server::Fork`, `Munin::Node::OS->run_as_child`, `Munin::Common::Timeout::do_with_timeout`, `Munin::Common::Logger`) and reports project-level validation attempts with exact blockers.
Validation reporting is acceptable: `make` and `make test` were attempted and blocked by missing `Module::Build`; there is no `make check` target; focused syntax checks and bounded reproduction attempts were described without overstating their results.perl likely remains stuck in a busy-poll loop. A diagnosis report and patch proposal were created locally.
## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.
## Patch Pass
You are working on a bounded fixer proposal.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Produce the smallest reasonable patch for the target repository, keep the change upstreamable, prefer the clearest control flow available, and do not keep avoidable `goto` when a simpler structure would read better. Before introducing new file, process, allocation, locking, networking, or platform APIs, inspect nearby code and project contribution docs for existing helpers or compatibility wrappers and use those local patterns unless you can explain why they do not fit. Validate from a reproducible workspace-root entrypoint before falling back to focused leaf commands; if a build or test cannot run, report the exact command, the exact blocker, and any narrower check you ran instead. During validation, also try one bounded independent reproduction of the collected failure signal when it is safe and cheap, such as a failing test, smoke command, perf/strace comparison, or before/after runtime check. Only use `reproduced` if that command or test actually reproduced the failure; otherwise keep `observed` and report the reproduction blocker. The final explanation must connect the observed issue evidence to the actual code change, not just paraphrase the diff. Write like a maintainer is going to read the patch mail cold: explain the bug in plain language, define subsystem-specific jargon the first time you need it, and make the causal story obvious. Explicitly classify evidence confidence as `reproduced`, `observed`, or `inferred`: `reproduced` means you reproduced the failure locally; `observed` means Fixer has direct crash/log/trace evidence but you did not independently reproduce it; `inferred` means the source patch is not pull-request-ready, so do not leave a source diff unless you first gather stronger observed/reproduced evidence; otherwise return a no-patch diagnosis/report. For any source-changing `observed` patch, say explicitly in `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. Security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior need reproduced evidence plus explicit security-impact analysis before leaving a source diff; otherwise return a no-patch diagnosis/report for human review. If you introduce non-obvious state translation, index remapping, or backend split logic, add a short source comment that explains the invariant being preserved.
Start by explaining the likely root cause from the collected perf, strace, and /proc evidence. If you cannot land a safe patch, leave a diagnosis that is strong enough for an upstream bug report.
Interpreter process expectation: when the hot process is Python, Perl, shell, Node, Ruby, PHP, Lua, or another interpreter, inspect both the runtime and the script/application entrypoint from `details.interpreter_process`. Prefer the script or application package when evidence points there; do not patch the interpreter runtime merely because the hot binary is `python`, `perl`, `bash`, or similar. Runtime fixes are welcome only after checking the entrypoint and explaining why the runtime mishandles the workload or why running bad code faster/safer is itself the right upstream fix.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Keep the change narrowly scoped and summarize validation clearly.
In every authoring pass, your final response must start with `Subject: <single-line git commit subject>` and then include these markdown sections exactly:
## Commit Message
A short upstream-friendly explanation of what changed and why. Write it in plain language that a maintainer can follow without local complaint context. If you use subsystem jargon, define it immediately.
## Evidence Confidence
Exactly one word: `reproduced`, `observed`, or `inferred`. Use `reproduced` only when you reproduced the failure locally with a command or test, and include that command/test in `## Validation`. Use `observed` when Fixer has direct crash/log/trace evidence but you did not independently reproduce it. If `## Git Add Paths` lists source files for an `observed` patch, `## Issue Connection` must explicitly say the failure was observed by Fixer and not independently reproduced. Security-sensitive source changes touching authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior require reproduced evidence and explicit security-impact analysis; otherwise list `None` under `## Git Add Paths` and write a no-patch diagnosis/report. Use `inferred` for profiler/strace/indirect evidence; inferred responses may be no-patch diagnoses or reports, but inferred source patches are not pull-request-ready until stronger evidence is gathered.
## Issue Connection
Write this as maintainer-facing patch mail, not as local Fixer notes. Cover four things explicitly in readable sentences: the user-visible symptom or the exact collected signal, the code-level cause or the cautious inference from evidence, the specific change you made, and the expected effect. Do not invent a reproducer, command line, crash, or user-visible failure that is not present in the evidence bundle. If the evidence is direct-but-not-reproduced, say it was observed by Fixer and not independently reproduced. If the evidence is indirect and you did not gather stronger evidence, do not leave a source diff; write a no-patch diagnosis/report instead. Include an explicit effect sentence such as `The expected effect is ...`, `This should reduce ...`, or `This prevents ...` for source patches. If the logic is non-obvious in code, mention that you added a short explanatory comment.
## Git Add Paths
List the repo-relative paths that belong in the final patch, one per line. Use `None` only when you intentionally made no source changes. Include intentionally new files, and do not list generated build artifacts.
## Validation
List the checks you ran, or say clearly that you could not run them. Include the independent reproduction command/test and result when `## Evidence Confidence` is `reproduced`; if reproduction was attempted but blocked, name the exact blocker and keep confidence at `observed` or `inferred`.
Before editing, read the plan at `./plan-output.txt` and follow it unless the code proves part of it wrong. If you change course, say so explicitly in the final write-up instead of silently drifting from the plan.
## Review Pass 1
You are reviewing a freshly generated fixer patch.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Review the first patch pass. The original pre-edit snapshot is available at `./source` for diffing.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout. The latest author response is at `./patch-output.txt`. Inspect the current code and changed paths like a strict code reviewer. Focus on correctness, regressions, maintainability, awkward control flow such as avoidable `goto`, missing validation, weak or non-gittable commit message text, and explanations that fail to connect the observed issue evidence to the code change. Also review the maintainer experience: the patch mail should be easy to accept upstream, the user-visible bug should be explained in plain language, subsystem-specific jargon should be defined when first used, and any non-obvious state translation or index remapping in code should have a short explanatory comment. Reject patches that omit `## Evidence Confidence`, use anything other than `reproduced`, `observed`, or `inferred`, or sound more certain than that evidence level allows. Reject patches that claim `reproduced` unless `## Validation` names the concrete reproduction command or test and its result. Reject source patches in security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior unless the author reproduced the behavior and explicitly analyzed the security impact of the change; observed-only evidence should become a diagnosis/report, not a PR-ready source diff. Reject patches that invent a reproducer, command line, crash, or user-visible failure not present in the evidence bundle; indirect profiler or strace evidence may justify a cautious mitigation, but the author must say it is indirect instead of presenting it as a confirmed upstream bug. Reject patches that introduce generic libc/std APIs when nearby code or project docs provide a local compat/helper API for the same job, unless the author explicitly justifies the exception. Reject validation that only reports a leaf object/syntax build when a project-level configure/build/test entrypoint exists and was not attempted; if a full build cannot run, the author must show the exact failed command and blocker.
Do not apply code changes in this pass.
Return a short markdown review report. The first non-empty line must be exactly one of:
RESULT: ok
RESULT: fix-needed
If you choose `RESULT: fix-needed`, add a `## Findings` section with concrete, actionable items.## Plan Pass
## Problem
Fixer observed `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` in repeated `pselect6` frames and labeled it a likely busy poll loop. The retained evidence does not include a Perl-level stack or script line, and the visible `strace` samples block for about 1.8 to 2.0 seconds with the process in `S (sleeping)` and only 0.9% CPU. That looks like munin-node/Net::Server idle polling, not a proven runaway loop.
## Evidence Confidence
observed
## Proposed Subject
No source patch yet: diagnose the Fixer signal as insufficient for an upstream munin change unless an independent reproduction shows short/zero-timeout polling or elevated CPU.
## Patch Plan
1. Do not edit in this pass, and do not patch Perl runtime code unless the application entrypoint is ruled out.
2. Treat `script/munin-node` and `lib/Munin/Node/Server.pm` as the first investigation targets. The entrypoint delegates to `Munin::Node::Server->run`, which subclasses `Net::Server::Fork`.
3. Treat `lib/Munin/Node/OS.pm` and `lib/Munin/Node/Service.pm` as secondary targets only if reproduction points at plugin child IO. Their local helper path is `Munin::Node::OS->run_as_child`, using `Munin::Common::Timeout::do_with_timeout`; logging convention is `Munin::Common::Logger`.
4. Follow maintainer conventions from `CONTRIBUTING.md` and `HACKING.pod`: taint-mode Perl, `strict`/`warnings`, English variable names where practical, one statement per line, match local indentation, and avoid awkward control flow such as avoidable `goto`.
5. If a real tight poll is reproduced, patch the narrow owning helper rather than adding Debian-local workarounds. If the loop is in Net::Server idle accept behavior with blocking 2-second waits, report no upstream munin source change.
6. No prior Fixer patch or workspace diff was found to improve or replace.
## Risks
A source patch based only on the current evidence would likely fix a speculative issue. Changing daemon polling, timeout, or request-loop behavior could affect connection handling, plugin timeouts, or process reaping without a demonstrated benefit. This is not security-sensitive as currently scoped.
## Validation
From the workspace root, first try the project-level entrypoints: `make`, then `make test` because this Makefile has `test` and no `check` target. If those fail from missing dependencies or generated files, record the exact command and failure reason.
Bounded independent reproduction attempt before any patch: run munin-node from the script entrypoint with a temporary minimal config/plugin directory under `/tmp`, trace `select`/`pselect6` for a few seconds, and verify whether calls block for roughly the Net::Server idle interval or spin with near-zero timeouts. Only claim `reproduced` if that command actually shows the failure signal.
## Patch Pass
Subject: No patch: diagnose munin-node idle select trace
## Commit Message
No source change is included. The collected evidence points to `munin-node` sleeping in a poll-family syscall, not to a proven busy loop in Munin or Perl. The visible `pselect6` calls block for about two seconds, the process state is `S (sleeping)`, and sampled CPU is low, so an upstream patch would be speculative without a Perl-level stack or a local reproduction.
## Evidence Confidence
inferred
## Issue Connection
Fixer collected perf, strace, and `/proc` evidence for `/usr/bin/perl -wT /usr/sbin/munin-node --foreground`: native frames were under Perl and `select`, with repeated `pselect6` syscalls. The important detail is that the retained `strace` lines show timeouts of about 1.8 to 2.0 seconds, and `/proc` reported the process as sleeping with about 0.9% CPU.
The cautious code-level inference is that this is probably munin-node’s normal idle server loop through `Munin::Node::Server`, which subclasses `Net::Server::Fork`, rather than a tight application loop. I inspected the script entrypoint first, per the interpreter-process evidence, and did not find a Munin-owned select loop matching the observed idle `pselect6` cadence. The nearby local helpers are `Munin::Node::OS->run_as_child` for plugin subprocess handling, `Munin::Common::Timeout::do_with_timeout` for bounded plugin/request work, and `Munin::Common::Logger` for logging; none fit a safe source change for the observed idle server wait.
I made no code change. The expected effect is that this proposal avoids landing an upstream patch for a profiler-only signal that currently looks like normal blocking behavior, and leaves a diagnosis suitable for an upstream report if stronger evidence is collected later. This follows the saved plan; no course change was needed.
## Git Add Paths
None
## Validation
`make` from the workspace root failed before build: `Can't locate Module/Build.pm in @INC ... at Build.PL line 80`, followed by `make: *** [Makefile:149: Build] Error 2`.
`make test` failed for the same blocker: `Can't locate Module/Build.pm in @INC ... at Build.PL line 80`, followed by `make: *** [Makefile:149: Build] Error 2`.
`make check` was not available in the Makefile; the project-level test target is `make test`.
Focused checks run after the project-level blocker:
`perl -T -Ilib -c script/munin-node` passed.
`perl -Ilib -c lib/Munin/Node/Server.pm` passed.
`perl -Ilib -c lib/Munin/Node/OS.pm` passed syntax, with redefinition warnings from the module load cycle.
Independent reproduction was attempted but blocked. `strace` failed with `PTRACE_TRACEME: Operation not permitted` and `ptrace(PTRACE_SEIZE, 6): Operation not permitted`. A fallback smoke run of `munin-node` with a temporary config failed before idling because Net::Server could not bind `127.0.0.1:14949`: `Operation not permitted`.
## Review Pass 1
RESULT: ok
No source diff is present against the original snapshot, and the author correctly treated the profiler/strace evidence as insufficient for a PR-ready Munin source patch.
The report includes a valid `## Evidence Confidence` value (`inferred`), does not claim local reproduction, and explains why the retained `pselect6` waits, sleeping process state, and low CPU do not prove a busy loop. It also names the relevant local subsystem/helpers (`Munin::Node::Server`, `Net::Server::Fork`, `Munin::Node::OS->run_as_child`, `Munin::Common::Timeout::do_with_timeout`, `Munin::Common::Logger`) and reports project-level validation attempts with exact blockers.
Validation reporting is acceptable: `make` and `make test` were attempted and blocked by missing `Module::Build`; there is no `make check` target; focused syntax checks and bounded reproduction attempts were described without overstating their results.perl likely remains stuck in a busy-poll loop. The diagnosis was captured, but the patch proposal did not complete cleanly.
execution
/usr/bin/perl -wT /usr/sbin/munin-node --foregroundThe trace repeatedly returns to a poll-family syscall without meaningful blocking, which suggests a busy event-loop wakeup.
Thread 1 (Thread 0x7f82eb914b80 (LWP 3947104) "munin-node"):
#0 0x00007f82eb9e87d2 in ?? () from target:<path>
#1 0x00007f82eb9e87ed in ?? () from target:<path>
#2 0x00007f82eba686cf in select () from target:<path>
#3 0x000055b5551b8ee4 in ?? ()
#4 0x000055b55521a496 in Perl_runops_standard ()
#5 0x000055b555100b85 in perl_run ()
#6 0x000055b5550d35ae in main ()## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.## Plan Pass
## Workflow Note
{"type":"turn.started"}
{"type":"error","message":"Reconnecting... 1/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 2/5 (stream disconnected before completion: Your authentication token has been invalidated. Please try signing in again.)"}
{"type":"error","message":"Reconnecting... 3/5 (stream disconnected before completion: Your authentication token has been invalidated. Please try signing in again.)"}
{"type":"error","message":"Reconnecting... 4/5 (stream disconnected before completion: Your authentication token has been invalidated. Please try signing in again.)"}
{"type":"error","message":"Reconnecting... 5/5 (stream disconnected before completion: Your authentication token has been invalidated. Please try signing in again.)"}
{"type":"error","message":"stream disconnected before completion: Your authentication token has been invalidated. Please try signing in again."}
{"type":"turn.failed","error":{"message":"stream disconnected before completion: Your authentication token has been invalidated. Please try signing in again."}}perl likely remains stuck in a busy-poll loop. The diagnosis was captured, but the patch proposal did not complete cleanly.
execution
/usr/bin/perl -wT /usr/sbin/munin-node --foregroundThe trace repeatedly returns to a poll-family syscall without meaningful blocking, which suggests a busy event-loop wakeup.
Thread 1 (Thread 0x7f82eb914b80 (LWP 3947104) "munin-node"):
#0 0x00007f82eb9e87d2 in ?? () from target:<path>
#1 0x00007f82eb9e87ed in ?? () from target:<path>
#2 0x00007f82eba686cf in select () from target:<path>
#3 0x000055b5551b8ee4 in ?? ()
#4 0x000055b55521a496 in Perl_runops_standard ()
#5 0x000055b555100b85 in perl_run ()
#6 0x000055b5550d35ae in main ()## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.## Plan Pass
## Workflow Note
{"type":"turn.started"}
{"type":"error","message":"Reconnecting... 1/5 (stream disconnected before completion: Your authentication token has been invalidated. Please try signing in again.)"}
{"type":"error","message":"Reconnecting... 2/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 3/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 4/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 5/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"We're currently experiencing high demand, which may cause temporary errors."}
{"type":"turn.failed","error":{"message":"We're currently experiencing high demand, which may cause temporary errors."}}perl likely remains stuck in a busy-poll loop. The diagnosis was captured, but the patch proposal did not complete cleanly.
execution
/usr/bin/perl -wT /usr/sbin/munin-node --foregroundThe trace repeatedly returns to a poll-family syscall without meaningful blocking, which suggests a busy event-loop wakeup.
Thread 1 (Thread 0x7f82eb914b80 (LWP 3947104) "munin-node"):
#0 0x00007f82eb9e87d2 in ?? () from target:<path>
#1 0x00007f82eb9e87ed in ?? () from target:<path>
#2 0x00007f82eba686cf in select () from target:<path>
#3 0x000055b5551b8ee4 in ?? ()
#4 0x000055b55521a496 in Perl_runops_standard ()
#5 0x000055b555100b85 in perl_run ()
#6 0x000055b5550d35ae in main ()## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.## Plan Pass
## Workflow Note
{"type":"turn.started"}
{"type":"error","message":"Reconnecting... 1/5 (stream disconnected before completion: Your authentication token has been invalidated. Please try signing in again.)"}
{"type":"error","message":"Reconnecting... 2/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 3/5 (stream disconnected before completion: Your authentication token has been invalidated. Please try signing in again.)"}
{"type":"error","message":"Reconnecting... 4/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 5/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"stream disconnected before completion: Your authentication token has been invalidated. Please try signing in again."}
{"type":"turn.failed","error":{"message":"stream disconnected before completion: Your authentication token has been invalidated. Please try signing in again."}}perl likely remains stuck in a busy-poll loop. A diagnosis report and patch proposal were created locally.
## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.
## Patch Pass
You are working on a bounded fixer proposal.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Produce the smallest reasonable patch for the target repository, keep the change upstreamable, prefer the clearest control flow available, and do not keep avoidable `goto` when a simpler structure would read better. Before introducing new file, process, allocation, locking, networking, or platform APIs, inspect nearby code and project contribution docs for existing helpers or compatibility wrappers and use those local patterns unless you can explain why they do not fit. Validate from a reproducible workspace-root entrypoint before falling back to focused leaf commands; if a build or test cannot run, report the exact command, the exact blocker, and any narrower check you ran instead. During validation, also try one bounded independent reproduction of the collected failure signal when it is safe and cheap, such as a failing test, smoke command, perf/strace comparison, or before/after runtime check. Only use `reproduced` if that command or test actually reproduced the failure; otherwise keep `observed` and report the reproduction blocker. The final explanation must connect the observed issue evidence to the actual code change, not just paraphrase the diff. Write like a maintainer is going to read the patch mail cold: explain the bug in plain language, define subsystem-specific jargon the first time you need it, and make the causal story obvious. Explicitly classify evidence confidence as `reproduced`, `observed`, or `inferred`: `reproduced` means you reproduced the failure locally; `observed` means Fixer has direct crash/log/trace evidence but you did not independently reproduce it; `inferred` means the source patch is not pull-request-ready, so do not leave a source diff unless you first gather stronger observed/reproduced evidence; otherwise return a no-patch diagnosis/report. For any source-changing `observed` patch, say explicitly in `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. Security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior need reproduced evidence plus explicit security-impact analysis before leaving a source diff; otherwise return a no-patch diagnosis/report for human review. If you introduce non-obvious state translation, index remapping, or backend split logic, add a short source comment that explains the invariant being preserved.
Start by explaining the likely root cause from the collected perf, strace, and /proc evidence. If you cannot land a safe patch, leave a diagnosis that is strong enough for an upstream bug report.
Interpreter process expectation: when the hot process is Python, Perl, shell, Node, Ruby, PHP, Lua, or another interpreter, inspect both the runtime and the script/application entrypoint from `details.interpreter_process`. Prefer the script or application package when evidence points there; do not patch the interpreter runtime merely because the hot binary is `python`, `perl`, `bash`, or similar. Runtime fixes are welcome only after checking the entrypoint and explaining why the runtime mishandles the workload or why running bad code faster/safer is itself the right upstream fix.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Keep the change narrowly scoped and summarize validation clearly.
In every authoring pass, your final response must start with `Subject: <single-line git commit subject>` and then include these markdown sections exactly:
## Commit Message
A short upstream-friendly explanation of what changed and why. Write it in plain language that a maintainer can follow without local complaint context. If you use subsystem jargon, define it immediately.
## Evidence Confidence
Exactly one word: `reproduced`, `observed`, or `inferred`. Use `reproduced` only when you reproduced the failure locally with a command or test, and include that command/test in `## Validation`. Use `observed` when Fixer has direct crash/log/trace evidence but you did not independently reproduce it. If `## Git Add Paths` lists source files for an `observed` patch, `## Issue Connection` must explicitly say the failure was observed by Fixer and not independently reproduced. Security-sensitive source changes touching authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior require reproduced evidence and explicit security-impact analysis; otherwise list `None` under `## Git Add Paths` and write a no-patch diagnosis/report. Use `inferred` for profiler/strace/indirect evidence; inferred responses may be no-patch diagnoses or reports, but inferred source patches are not pull-request-ready until stronger evidence is gathered.
## Issue Connection
Write this as maintainer-facing patch mail, not as local Fixer notes. Cover four things explicitly in readable sentences: the user-visible symptom or the exact collected signal, the code-level cause or the cautious inference from evidence, the specific change you made, and the expected effect. Do not invent a reproducer, command line, crash, or user-visible failure that is not present in the evidence bundle. If the evidence is direct-but-not-reproduced, say it was observed by Fixer and not independently reproduced. If the evidence is indirect and you did not gather stronger evidence, do not leave a source diff; write a no-patch diagnosis/report instead. Include an explicit effect sentence such as `The expected effect is ...`, `This should reduce ...`, or `This prevents ...` for source patches. If the logic is non-obvious in code, mention that you added a short explanatory comment.
## Git Add Paths
List the repo-relative paths that belong in the final patch, one per line. Use `None` only when you intentionally made no source changes. Include intentionally new files, and do not list generated build artifacts.
## Validation
List the checks you ran, or say clearly that you could not run them. Include the independent reproduction command/test and result when `## Evidence Confidence` is `reproduced`; if reproduction was attempted but blocked, name the exact blocker and keep confidence at `observed` or `inferred`.
Before editing, read the plan at `./plan-output.txt` and follow it unless the code proves part of it wrong. If you change course, say so explicitly in the final write-up instead of silently drifting from the plan.
## Review Pass 1
You are reviewing a freshly generated fixer patch.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Review the first patch pass. The original pre-edit snapshot is available at `./source` for diffing.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout. The latest author response is at `./patch-output.txt`. Inspect the current code and changed paths like a strict code reviewer. Focus on correctness, regressions, maintainability, awkward control flow such as avoidable `goto`, missing validation, weak or non-gittable commit message text, and explanations that fail to connect the observed issue evidence to the code change. Also review the maintainer experience: the patch mail should be easy to accept upstream, the user-visible bug should be explained in plain language, subsystem-specific jargon should be defined when first used, and any non-obvious state translation or index remapping in code should have a short explanatory comment. Reject patches that omit `## Evidence Confidence`, use anything other than `reproduced`, `observed`, or `inferred`, or sound more certain than that evidence level allows. Reject patches that claim `reproduced` unless `## Validation` names the concrete reproduction command or test and its result. Reject source patches in security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior unless the author reproduced the behavior and explicitly analyzed the security impact of the change; observed-only evidence should become a diagnosis/report, not a PR-ready source diff. Reject patches that invent a reproducer, command line, crash, or user-visible failure not present in the evidence bundle; indirect profiler or strace evidence may justify a cautious mitigation, but the author must say it is indirect instead of presenting it as a confirmed upstream bug. Reject patches that introduce generic libc/std APIs when nearby code or project docs provide a local compat/helper API for the same job, unless the author explicitly justifies the exception. Reject validation that only reports a leaf object/syntax build when a project-level configure/build/test entrypoint exists and was not attempted; if a full build cannot run, the author must show the exact failed command and blocker.
Do not apply code changes in this pass.
Return a short markdown review report. The first non-empty line must be exactly one of:
RESULT: ok
RESULT: fix-needed
If you choose `RESULT: fix-needed`, add a `## Findings` section with concrete, actionable items.## Plan Pass
## Problem
Fixer sampled `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` and labeled it a likely busy poll loop, but the retained evidence shows `munin-node` in `S (sleeping)` with `pselect6` calls timing out after about 1.8-2.0 seconds and only 0.9% CPU. There is no Perl-level stack tying the profile to Munin application logic.
## Evidence Confidence
inferred
The evidence is indirect and internally weak for a source fix: it observed a Perl/`munin-node` process in `select`, but did not reproduce a runaway loop or identify a Munin line/module causing it.
## Proposed Subject
No source patch: diagnose the report as insufficient for an upstream Munin change unless a bounded reproduction captures high CPU or zero/near-zero timeout polling in `munin-node`.
## Patch Plan
Do not edit files in this pass. The likely relevant code path is `script/munin-node` -> `Munin::Node::Server`, which subclasses `Net::Server::Fork`; the observed `select` is plausibly the server accept loop, not Munin plugin logic.
If later evidence proves a Munin-side loop, patch the smallest implicated subsystem using existing conventions: `use strict; use warnings;`, `English qw(-no_match_vars)`, `Munin::Common::Logger` logging helpers, `Munin::Common::Timeout`, and `Munin::Node::OS->run_as_child` for plugin child handling. No relevant local wrapper was found for the `Net::Server::Fork` accept-loop `select` itself.
No prior Fixer patch appears to need replacement; the tree only shows the Debian `async-spool-directory.patch`. Avoid awkward control flow such as `goto`; any future fix should be a bounded branch or helper with a test.
## Risks
Changing idle server polling without reproduction could regress normal daemon behavior, socket readiness, signal handling, or systemd foreground startup. This is not security-sensitive based on current evidence.
## Validation
Before any focused check, try project-level entrypoints from the workspace root: `make`, then `make test` because `make check` is not defined in this Makefile.
Bounded independent reproduction attempt: after building, run a short `munin-node --foreground` smoke under `strace -ttT -f -e trace=pselect6,select,poll,ppoll` using the project’s taint-safe `dev_scripts/run`/sandbox flow, and verify whether it shows high CPU or rapid zero-timeout polling. If it only shows multi-second blocking `pselect6`, report no upstream patch is justified.
## Patch Pass
Subject: Diagnose munin-node idle select evidence without source changes
## Commit Message
No source change is proposed. The collected evidence points at an idle `munin-node` Perl process blocked in `select`/`pselect6`, but it does not identify a Munin code path spinning or consuming high CPU.
## Evidence Confidence
inferred
## Issue Connection
Fixer collected perf, strace, and `/proc` evidence for `/usr/bin/perl -wT /usr/sbin/munin-node --foreground`: the backtrace is in `select`, the wait channel is `poll_schedule_timeout.constprop.0`, process state is `S (sleeping)`, and the retained strace shows `pselect6` calls timing out after about 1.8 to 2.0 seconds. That signal is not enough to establish a Munin busy loop.
The likely root cause is that the sampled process was in the normal `Net::Server::Fork` accept loop used by `Munin::Node::Server`, not in Munin plugin execution or request handling. I inspected the Perl script entrypoint first, as required for interpreter evidence, and did not find a Munin-controlled tight polling loop. Nearby code uses `Munin::Common::Logger`, `Munin::Common::Timeout`, and `Munin::Node::OS->run_as_child` for logging, timeout handling, and plugin child process management; no relevant local helper exists for the inherited `Net::Server::Fork` accept-loop `select`.
I made no source change because the evidence is profiler/strace-only and my reproduction attempts were blocked before they could confirm rapid polling or high CPU. The expected effect is that this remains a diagnosis suitable for an upstream bug report instead of a speculative patch.
## Git Add Paths
None
## Validation
`make` from the workspace root failed before project build/test execution because `Module::Build` is missing: `Can't locate Module/Build.pm in @INC ... at Build.PL line 80`, followed by `make: *** [Makefile:149: Build] Error 2`.
`make check` failed because the project has no `check` target: `make: *** No rule to make target 'check'. Stop.`
Focused syntax checks run from the workspace root:
`perl -T -Ilib -c script/munin-node` passed.
`perl -Ilib -c lib/Munin/Node/Server.pm` passed.
`perl -Ilib -c lib/Munin/Node/OS.pm` passed, with existing redefinition warnings from loading installed/local Munin modules.
Independent reproduction was attempted with `timeout 5 strace -ttT -f -e trace=pselect6,select,poll,ppoll,epoll_wait,nanosleep,clock_nanosleep perl -T -Ilib script/munin-node ...`, but ptrace is blocked in this sandbox: `PTRACE_TRACEME: Operation not permitted` and `ptrace(PTRACE_SEIZE, 7): Operation not permitted`.
A non-strace foreground smoke was also attempted, but socket binding is blocked: `Cannot bind and listen to TCP port 4949 on 127.0.0.1 [Operation not permitted]`. Therefore I could not independently reproduce the collected failure signal.
## Review Pass 1
RESULT: ok
No source diff is present, and the no-patch diagnosis is appropriate for the evidence level. The author kept `## Evidence Confidence` at `inferred`, did not claim reproduction, did not invent a user-visible failure, and reported the project-level validation blockers before listing focused syntax checks.
The response also follows the saved plan: it inspects the Perl script entrypoint rather than blaming the Perl runtime, names relevant Munin helper conventions (`Munin::Common::Logger`, `Munin::Common::Timeout`, `Munin::Node::OS->run_as_child`), and explains why no local helper applies to the inherited `Net::Server::Fork` accept loop.perl likely remains stuck in a busy-poll loop. A diagnosis report and patch proposal were created locally.
## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.
## Patch Pass
You are working on a bounded fixer proposal.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Produce the smallest reasonable patch for the target repository, keep the change upstreamable, prefer the clearest control flow available, and do not keep avoidable `goto` when a simpler structure would read better. Before introducing new file, process, allocation, locking, networking, or platform APIs, inspect nearby code and project contribution docs for existing helpers or compatibility wrappers and use those local patterns unless you can explain why they do not fit. Validate from a reproducible workspace-root entrypoint before falling back to focused leaf commands; if a build or test cannot run, report the exact command, the exact blocker, and any narrower check you ran instead. During validation, also try one bounded independent reproduction of the collected failure signal when it is safe and cheap, such as a failing test, smoke command, perf/strace comparison, or before/after runtime check. Only use `reproduced` if that command or test actually reproduced the failure; otherwise keep `observed` and report the reproduction blocker. The final explanation must connect the observed issue evidence to the actual code change, not just paraphrase the diff. Write like a maintainer is going to read the patch mail cold: explain the bug in plain language, define subsystem-specific jargon the first time you need it, and make the causal story obvious. Explicitly classify evidence confidence as `reproduced`, `observed`, or `inferred`: `reproduced` means you reproduced the failure locally; `observed` means Fixer has direct crash/log/trace evidence but you did not independently reproduce it; `inferred` means the source patch is not pull-request-ready, so do not leave a source diff unless you first gather stronger observed/reproduced evidence; otherwise return a no-patch diagnosis/report. For any source-changing `observed` patch, say explicitly in `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. Security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior need reproduced evidence plus explicit security-impact analysis before leaving a source diff; otherwise return a no-patch diagnosis/report for human review. If you introduce non-obvious state translation, index remapping, or backend split logic, add a short source comment that explains the invariant being preserved.
Start by explaining the likely root cause from the collected perf, strace, and /proc evidence. If you cannot land a safe patch, leave a diagnosis that is strong enough for an upstream bug report.
Interpreter process expectation: when the hot process is Python, Perl, shell, Node, Ruby, PHP, Lua, or another interpreter, inspect both the runtime and the script/application entrypoint from `details.interpreter_process`. Prefer the script or application package when evidence points there; do not patch the interpreter runtime merely because the hot binary is `python`, `perl`, `bash`, or similar. Runtime fixes are welcome only after checking the entrypoint and explaining why the runtime mishandles the workload or why running bad code faster/safer is itself the right upstream fix.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Keep the change narrowly scoped and summarize validation clearly.
In every authoring pass, your final response must start with `Subject: <single-line git commit subject>` and then include these markdown sections exactly:
## Commit Message
A short upstream-friendly explanation of what changed and why. Write it in plain language that a maintainer can follow without local complaint context. If you use subsystem jargon, define it immediately.
## Evidence Confidence
Exactly one word: `reproduced`, `observed`, or `inferred`. Use `reproduced` only when you reproduced the failure locally with a command or test, and include that command/test in `## Validation`. Use `observed` when Fixer has direct crash/log/trace evidence but you did not independently reproduce it. If `## Git Add Paths` lists source files for an `observed` patch, `## Issue Connection` must explicitly say the failure was observed by Fixer and not independently reproduced. Security-sensitive source changes touching authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior require reproduced evidence and explicit security-impact analysis; otherwise list `None` under `## Git Add Paths` and write a no-patch diagnosis/report. Use `inferred` for profiler/strace/indirect evidence; inferred responses may be no-patch diagnoses or reports, but inferred source patches are not pull-request-ready until stronger evidence is gathered.
## Issue Connection
Write this as maintainer-facing patch mail, not as local Fixer notes. Cover four things explicitly in readable sentences: the user-visible symptom or the exact collected signal, the code-level cause or the cautious inference from evidence, the specific change you made, and the expected effect. Do not invent a reproducer, command line, crash, or user-visible failure that is not present in the evidence bundle. If the evidence is direct-but-not-reproduced, say it was observed by Fixer and not independently reproduced. If the evidence is indirect and you did not gather stronger evidence, do not leave a source diff; write a no-patch diagnosis/report instead. Include an explicit effect sentence such as `The expected effect is ...`, `This should reduce ...`, or `This prevents ...` for source patches. If the logic is non-obvious in code, mention that you added a short explanatory comment.
## Git Add Paths
List the repo-relative paths that belong in the final patch, one per line. Use `None` only when you intentionally made no source changes. Include intentionally new files, and do not list generated build artifacts.
## Validation
List the checks you ran, or say clearly that you could not run them. Include the independent reproduction command/test and result when `## Evidence Confidence` is `reproduced`; if reproduction was attempted but blocked, name the exact blocker and keep confidence at `observed` or `inferred`.
Before editing, read the plan at `./plan-output.txt` and follow it unless the code proves part of it wrong. If you change course, say so explicitly in the final write-up instead of silently drifting from the plan.
## Review Pass 1
You are reviewing a freshly generated fixer patch.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Review the first patch pass. The original pre-edit snapshot is available at `./source` for diffing.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout. The latest author response is at `./patch-output.txt`. Inspect the current code and changed paths like a strict code reviewer. Focus on correctness, regressions, maintainability, awkward control flow such as avoidable `goto`, missing validation, weak or non-gittable commit message text, and explanations that fail to connect the observed issue evidence to the code change. Also review the maintainer experience: the patch mail should be easy to accept upstream, the user-visible bug should be explained in plain language, subsystem-specific jargon should be defined when first used, and any non-obvious state translation or index remapping in code should have a short explanatory comment. Reject patches that omit `## Evidence Confidence`, use anything other than `reproduced`, `observed`, or `inferred`, or sound more certain than that evidence level allows. Reject patches that claim `reproduced` unless `## Validation` names the concrete reproduction command or test and its result. Reject source patches in security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior unless the author reproduced the behavior and explicitly analyzed the security impact of the change; observed-only evidence should become a diagnosis/report, not a PR-ready source diff. Reject patches that invent a reproducer, command line, crash, or user-visible failure not present in the evidence bundle; indirect profiler or strace evidence may justify a cautious mitigation, but the author must say it is indirect instead of presenting it as a confirmed upstream bug. Reject patches that introduce generic libc/std APIs when nearby code or project docs provide a local compat/helper API for the same job, unless the author explicitly justifies the exception. Reject validation that only reports a leaf object/syntax build when a project-level configure/build/test entrypoint exists and was not attempted; if a full build cannot run, the author must show the exact failed command and blocker.
Do not apply code changes in this pass.
Return a short markdown review report. The first non-empty line must be exactly one of:
RESULT: ok
RESULT: fix-needed
If you choose `RESULT: fix-needed`, add a `## Findings` section with concrete, actionable items.## Plan Pass
## Problem
Fixer sampled `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` and labeled it a likely busy poll loop, but the retained evidence shows `munin-node` in `S (sleeping)` with `pselect6` calls timing out after about 1.8-2.0 seconds and only 0.9% CPU. There is no Perl-level stack tying the profile to Munin application logic.
## Evidence Confidence
inferred
The evidence is indirect and internally weak for a source fix: it observed a Perl/`munin-node` process in `select`, but did not reproduce a runaway loop or identify a Munin line/module causing it.
## Proposed Subject
No source patch: diagnose the report as insufficient for an upstream Munin change unless a bounded reproduction captures high CPU or zero/near-zero timeout polling in `munin-node`.
## Patch Plan
Do not edit files in this pass. The likely relevant code path is `script/munin-node` -> `Munin::Node::Server`, which subclasses `Net::Server::Fork`; the observed `select` is plausibly the server accept loop, not Munin plugin logic.
If later evidence proves a Munin-side loop, patch the smallest implicated subsystem using existing conventions: `use strict; use warnings;`, `English qw(-no_match_vars)`, `Munin::Common::Logger` logging helpers, `Munin::Common::Timeout`, and `Munin::Node::OS->run_as_child` for plugin child handling. No relevant local wrapper was found for the `Net::Server::Fork` accept-loop `select` itself.
No prior Fixer patch appears to need replacement; the tree only shows the Debian `async-spool-directory.patch`. Avoid awkward control flow such as `goto`; any future fix should be a bounded branch or helper with a test.
## Risks
Changing idle server polling without reproduction could regress normal daemon behavior, socket readiness, signal handling, or systemd foreground startup. This is not security-sensitive based on current evidence.
## Validation
Before any focused check, try project-level entrypoints from the workspace root: `make`, then `make test` because `make check` is not defined in this Makefile.
Bounded independent reproduction attempt: after building, run a short `munin-node --foreground` smoke under `strace -ttT -f -e trace=pselect6,select,poll,ppoll` using the project’s taint-safe `dev_scripts/run`/sandbox flow, and verify whether it shows high CPU or rapid zero-timeout polling. If it only shows multi-second blocking `pselect6`, report no upstream patch is justified.
## Patch Pass
Subject: Diagnose munin-node idle select evidence without source changes
## Commit Message
No source change is proposed. The collected evidence points at an idle `munin-node` Perl process blocked in `select`/`pselect6`, but it does not identify a Munin code path spinning or consuming high CPU.
## Evidence Confidence
inferred
## Issue Connection
Fixer collected perf, strace, and `/proc` evidence for `/usr/bin/perl -wT /usr/sbin/munin-node --foreground`: the backtrace is in `select`, the wait channel is `poll_schedule_timeout.constprop.0`, process state is `S (sleeping)`, and the retained strace shows `pselect6` calls timing out after about 1.8 to 2.0 seconds. That signal is not enough to establish a Munin busy loop.
The likely root cause is that the sampled process was in the normal `Net::Server::Fork` accept loop used by `Munin::Node::Server`, not in Munin plugin execution or request handling. I inspected the Perl script entrypoint first, as required for interpreter evidence, and did not find a Munin-controlled tight polling loop. Nearby code uses `Munin::Common::Logger`, `Munin::Common::Timeout`, and `Munin::Node::OS->run_as_child` for logging, timeout handling, and plugin child process management; no relevant local helper exists for the inherited `Net::Server::Fork` accept-loop `select`.
I made no source change because the evidence is profiler/strace-only and my reproduction attempts were blocked before they could confirm rapid polling or high CPU. The expected effect is that this remains a diagnosis suitable for an upstream bug report instead of a speculative patch.
## Git Add Paths
None
## Validation
`make` from the workspace root failed before project build/test execution because `Module::Build` is missing: `Can't locate Module/Build.pm in @INC ... at Build.PL line 80`, followed by `make: *** [Makefile:149: Build] Error 2`.
`make check` failed because the project has no `check` target: `make: *** No rule to make target 'check'. Stop.`
Focused syntax checks run from the workspace root:
`perl -T -Ilib -c script/munin-node` passed.
`perl -Ilib -c lib/Munin/Node/Server.pm` passed.
`perl -Ilib -c lib/Munin/Node/OS.pm` passed, with existing redefinition warnings from loading installed/local Munin modules.
Independent reproduction was attempted with `timeout 5 strace -ttT -f -e trace=pselect6,select,poll,ppoll,epoll_wait,nanosleep,clock_nanosleep perl -T -Ilib script/munin-node ...`, but ptrace is blocked in this sandbox: `PTRACE_TRACEME: Operation not permitted` and `ptrace(PTRACE_SEIZE, 7): Operation not permitted`.
A non-strace foreground smoke was also attempted, but socket binding is blocked: `Cannot bind and listen to TCP port 4949 on 127.0.0.1 [Operation not permitted]`. Therefore I could not independently reproduce the collected failure signal.
## Review Pass 1
RESULT: ok
No source diff is present, and the no-patch diagnosis is appropriate for the evidence level. The author kept `## Evidence Confidence` at `inferred`, did not claim reproduction, did not invent a user-visible failure, and reported the project-level validation blockers before listing focused syntax checks.
The response also follows the saved plan: it inspects the Perl script entrypoint rather than blaming the Perl runtime, names relevant Munin helper conventions (`Munin::Common::Logger`, `Munin::Common::Timeout`, `Munin::Node::OS->run_as_child`), and explains why no local helper applies to the inherited `Net::Server::Fork` accept loop.perl likely remains stuck in a busy-poll loop. The diagnosis was captured, but the patch proposal did not complete cleanly.
execution
/usr/bin/perl -wT /usr/sbin/munin-node --foregroundThe trace repeatedly returns to a poll-family syscall without meaningful blocking, which suggests a busy event-loop wakeup.
Thread 1 (Thread 0x7f82eb914b80 (LWP 3947104) "munin-node"):
#0 0x00007f82eb9e87d2 in ?? () from target:<path>
#1 0x00007f82eb9e87ed in ?? () from target:<path>
#2 0x00007f82eba686cf in select () from target:<path>
#3 0x000055b5551b8ee4 in ?? ()
#4 0x000055b55521a496 in Perl_runops_standard ()
#5 0x000055b555100b85 in perl_run ()
#6 0x000055b5550d35ae in main ()## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.## Plan Pass
## Workflow Note
{"type":"turn.started"}
{"type":"error","message":"Reconnecting... 1/5 (stream disconnected before completion: Your authentication token has been invalidated. Please try signing in again.)"}
{"type":"error","message":"Reconnecting... 2/5 (stream disconnected before completion: Your authentication token has been invalidated. Please try signing in again.)"}
{"type":"error","message":"Reconnecting... 3/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 4/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 5/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"stream disconnected before completion: Your authentication token has been invalidated. Please try signing in again."}
{"type":"turn.failed","error":{"message":"stream disconnected before completion: Your authentication token has been invalidated. Please try signing in again."}}perl likely remains stuck in a busy-poll loop. The diagnosis was captured, but the patch proposal did not complete cleanly.
execution
/usr/bin/perl -wT /usr/sbin/munin-node --foregroundThe trace repeatedly returns to a poll-family syscall without meaningful blocking, which suggests a busy event-loop wakeup.
Thread 1 (Thread 0x7f82eb914b80 (LWP 3947104) "munin-node"):
#0 0x00007f82eb9e87d2 in ?? () from target:<path>
#1 0x00007f82eb9e87ed in ?? () from target:<path>
#2 0x00007f82eba686cf in select () from target:<path>
#3 0x000055b5551b8ee4 in ?? ()
#4 0x000055b55521a496 in Perl_runops_standard ()
#5 0x000055b555100b85 in perl_run ()
#6 0x000055b5550d35ae in main ()## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.## Plan Pass
## Workflow Note
{"type":"turn.started"}
{"type":"error","message":"Reconnecting... 1/5 (stream disconnected before completion: Your authentication token has been invalidated. Please try signing in again.)"}
{"type":"error","message":"Reconnecting... 2/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 3/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 4/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 5/5 (stream disconnected before completion: Your authentication token has been invalidated. Please try signing in again.)"}
{"type":"error","message":"We're currently experiencing high demand, which may cause temporary errors."}
{"type":"turn.failed","error":{"message":"We're currently experiencing high demand, which may cause temporary errors."}}perl likely remains stuck in a busy-poll loop. The diagnosis was captured, but the patch proposal did not complete cleanly.
execution
/usr/bin/perl -wT /usr/sbin/munin-node --foregroundThe trace repeatedly returns to a poll-family syscall without meaningful blocking, which suggests a busy event-loop wakeup.
Thread 1 (Thread 0x7f82eb914b80 (LWP 3947104) "munin-node"):
#0 0x00007f82eb9e87d2 in ?? () from target:<path>
#1 0x00007f82eb9e87ed in ?? () from target:<path>
#2 0x00007f82eba686cf in select () from target:<path>
#3 0x000055b5551b8ee4 in ?? ()
#4 0x000055b55521a496 in Perl_runops_standard ()
#5 0x000055b555100b85 in perl_run ()
#6 0x000055b5550d35ae in main ()## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.## Plan Pass
## Workflow Note
{"type":"turn.started"}
{"type":"error","message":"Reconnecting... 1/5 (stream disconnected before completion: Your authentication token has been invalidated. Please try signing in again.)"}
{"type":"error","message":"Reconnecting... 2/5 (stream disconnected before completion: Your authentication token has been invalidated. Please try signing in again.)"}
{"type":"error","message":"Reconnecting... 3/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 4/5 (stream disconnected before completion: Your authentication token has been invalidated. Please try signing in again.)"}
{"type":"error","message":"Reconnecting... 5/5 (stream disconnected before completion: Your authentication token has been invalidated. Please try signing in again.)"}
{"type":"error","message":"We're currently experiencing high demand, which may cause temporary errors."}
{"type":"turn.failed","error":{"message":"We're currently experiencing high demand, which may cause temporary errors."}}perl likely remains stuck in a busy-poll loop. The diagnosis was captured, but the patch proposal did not complete cleanly.
execution
/usr/bin/perl -wT /usr/sbin/munin-node --foregroundThe trace repeatedly returns to a poll-family syscall without meaningful blocking, which suggests a busy event-loop wakeup.
Thread 1 (Thread 0x7f82eb914b80 (LWP 3947104) "munin-node"):
#0 0x00007f82eb9e87d2 in ?? () from target:<path>
#1 0x00007f82eb9e87ed in ?? () from target:<path>
#2 0x00007f82eba686cf in select () from target:<path>
#3 0x000055b5551b8ee4 in ?? ()
#4 0x000055b55521a496 in Perl_runops_standard ()
#5 0x000055b555100b85 in perl_run ()
#6 0x000055b5550d35ae in main ()## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.## Plan Pass
## Workflow Note
{"type":"turn.started"}
{"type":"error","message":"Reconnecting... 1/5 (stream disconnected before completion: Your authentication token has been invalidated. Please try signing in again.)"}
{"type":"error","message":"Reconnecting... 2/5 (stream disconnected before completion: Your authentication token has been invalidated. Please try signing in again.)"}
{"type":"error","message":"Reconnecting... 3/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 4/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 5/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"stream disconnected before completion: Your authentication token has been invalidated. Please try signing in again."}
{"type":"turn.failed","error":{"message":"stream disconnected before completion: Your authentication token has been invalidated. Please try signing in again."}}perl likely remains stuck in a busy-poll loop. A diagnosis report and patch proposal were created locally.
## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.
## Patch Pass
You are working on a bounded fixer proposal.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Produce the smallest reasonable patch for the target repository, keep the change upstreamable, prefer the clearest control flow available, and do not keep avoidable `goto` when a simpler structure would read better. Before introducing new file, process, allocation, locking, networking, or platform APIs, inspect nearby code and project contribution docs for existing helpers or compatibility wrappers and use those local patterns unless you can explain why they do not fit. Validate from a reproducible workspace-root entrypoint before falling back to focused leaf commands; if a build or test cannot run, report the exact command, the exact blocker, and any narrower check you ran instead. During validation, also try one bounded independent reproduction of the collected failure signal when it is safe and cheap, such as a failing test, smoke command, perf/strace comparison, or before/after runtime check. Only use `reproduced` if that command or test actually reproduced the failure; otherwise keep `observed` and report the reproduction blocker. The final explanation must connect the observed issue evidence to the actual code change, not just paraphrase the diff. Write like a maintainer is going to read the patch mail cold: explain the bug in plain language, define subsystem-specific jargon the first time you need it, and make the causal story obvious. Explicitly classify evidence confidence as `reproduced`, `observed`, or `inferred`: `reproduced` means you reproduced the failure locally; `observed` means Fixer has direct crash/log/trace evidence but you did not independently reproduce it; `inferred` means the source patch is not pull-request-ready, so do not leave a source diff unless you first gather stronger observed/reproduced evidence; otherwise return a no-patch diagnosis/report. For any source-changing `observed` patch, say explicitly in `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. Security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior need reproduced evidence plus explicit security-impact analysis before leaving a source diff; otherwise return a no-patch diagnosis/report for human review. If you introduce non-obvious state translation, index remapping, or backend split logic, add a short source comment that explains the invariant being preserved.
Start by explaining the likely root cause from the collected perf, strace, and /proc evidence. If you cannot land a safe patch, leave a diagnosis that is strong enough for an upstream bug report.
Interpreter process expectation: when the hot process is Python, Perl, shell, Node, Ruby, PHP, Lua, or another interpreter, inspect both the runtime and the script/application entrypoint from `details.interpreter_process`. Prefer the script or application package when evidence points there; do not patch the interpreter runtime merely because the hot binary is `python`, `perl`, `bash`, or similar. Runtime fixes are welcome only after checking the entrypoint and explaining why the runtime mishandles the workload or why running bad code faster/safer is itself the right upstream fix.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Keep the change narrowly scoped and summarize validation clearly.
In every authoring pass, your final response must start with `Subject: <single-line git commit subject>` and then include these markdown sections exactly:
## Commit Message
A short upstream-friendly explanation of what changed and why. Write it in plain language that a maintainer can follow without local complaint context. If you use subsystem jargon, define it immediately.
## Evidence Confidence
Exactly one word: `reproduced`, `observed`, or `inferred`. Use `reproduced` only when you reproduced the failure locally with a command or test, and include that command/test in `## Validation`. Use `observed` when Fixer has direct crash/log/trace evidence but you did not independently reproduce it. If `## Git Add Paths` lists source files for an `observed` patch, `## Issue Connection` must explicitly say the failure was observed by Fixer and not independently reproduced. Security-sensitive source changes touching authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior require reproduced evidence and explicit security-impact analysis; otherwise list `None` under `## Git Add Paths` and write a no-patch diagnosis/report. Use `inferred` for profiler/strace/indirect evidence; inferred responses may be no-patch diagnoses or reports, but inferred source patches are not pull-request-ready until stronger evidence is gathered.
## Issue Connection
Write this as maintainer-facing patch mail, not as local Fixer notes. Cover four things explicitly in readable sentences: the user-visible symptom or the exact collected signal, the code-level cause or the cautious inference from evidence, the specific change you made, and the expected effect. Do not invent a reproducer, command line, crash, or user-visible failure that is not present in the evidence bundle. If the evidence is direct-but-not-reproduced, say it was observed by Fixer and not independently reproduced. If the evidence is indirect and you did not gather stronger evidence, do not leave a source diff; write a no-patch diagnosis/report instead. Include an explicit effect sentence such as `The expected effect is ...`, `This should reduce ...`, or `This prevents ...` for source patches. If the logic is non-obvious in code, mention that you added a short explanatory comment.
## Git Add Paths
List the repo-relative paths that belong in the final patch, one per line. Use `None` only when you intentionally made no source changes. Include intentionally new files, and do not list generated build artifacts.
## Validation
List the checks you ran, or say clearly that you could not run them. Include the independent reproduction command/test and result when `## Evidence Confidence` is `reproduced`; if reproduction was attempted but blocked, name the exact blocker and keep confidence at `observed` or `inferred`.
Before editing, read the plan at `./plan-output.txt` and follow it unless the code proves part of it wrong. If you change course, say so explicitly in the final write-up instead of silently drifting from the plan.
## Review Pass 1
You are reviewing a freshly generated fixer patch.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Review the first patch pass. The original pre-edit snapshot is available at `./source` for diffing.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout. The latest author response is at `./patch-output.txt`. Inspect the current code and changed paths like a strict code reviewer. Focus on correctness, regressions, maintainability, awkward control flow such as avoidable `goto`, missing validation, weak or non-gittable commit message text, and explanations that fail to connect the observed issue evidence to the code change. Also review the maintainer experience: the patch mail should be easy to accept upstream, the user-visible bug should be explained in plain language, subsystem-specific jargon should be defined when first used, and any non-obvious state translation or index remapping in code should have a short explanatory comment. Reject patches that omit `## Evidence Confidence`, use anything other than `reproduced`, `observed`, or `inferred`, or sound more certain than that evidence level allows. Reject patches that claim `reproduced` unless `## Validation` names the concrete reproduction command or test and its result. Reject source patches in security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior unless the author reproduced the behavior and explicitly analyzed the security impact of the change; observed-only evidence should become a diagnosis/report, not a PR-ready source diff. Reject patches that invent a reproducer, command line, crash, or user-visible failure not present in the evidence bundle; indirect profiler or strace evidence may justify a cautious mitigation, but the author must say it is indirect instead of presenting it as a confirmed upstream bug. Reject patches that introduce generic libc/std APIs when nearby code or project docs provide a local compat/helper API for the same job, unless the author explicitly justifies the exception. Reject validation that only reports a leaf object/syntax build when a project-level configure/build/test entrypoint exists and was not attempted; if a full build cannot run, the author must show the exact failed command and blocker.
Do not apply code changes in this pass.
Return a short markdown review report. The first non-empty line must be exactly one of:
RESULT: ok
RESULT: fix-needed
If you choose `RESULT: fix-needed`, add a `## Findings` section with concrete, actionable items.## Plan Pass
## Problem
Fixer observed `munin-node` launched as `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` in a repeated `pselect6`/`select` wait. The retained evidence does not include a Perl-level stack or a request/plugin workload tying the samples to munin application logic, and the captured process state was `S (sleeping)` with about `0.9%` CPU and `pselect6` calls timing out after roughly 2 seconds.
## Evidence Confidence
observed
## Proposed Subject
No source patch yet: diagnose whether the observed `munin-node` `pselect6` loop is normal idle `Net::Server::Fork` accept-loop behavior before proposing an upstream code change.
## Patch Plan
1. Do not patch Perl or munin-node from the current evidence alone.
2. Treat `/usr/sbin/munin-node` as the primary target, per the interpreter evidence; only investigate Perl runtime behavior if a script-level reproducer shows Perl mishandling the workload.
3. Confirm whether the `pselect6(..., {tv_sec=2})` pattern comes from `Net::Server::Fork`’s idle accept loop rather than `Munin::Node::Server::process_request`.
4. If additional evidence shows a real tight loop, patch the smallest munin-node layer involved, following local conventions from `CONTRIBUTING.md` and `HACKING.pod`: taint-mode-safe Perl, `use strict`, `use warnings`, clear one-statement-per-line style, no avoidable `goto`, and existing helpers such as `Munin::Common::Timeout::do_with_timeout`, `Munin::Node::OS->run_as_child`, and `Munin::Common::Logger`.
5. No prior Fixer patch needs replacing; the workspace is at `Fixer baseline`.
## Risks
Changing timeout or accept-loop behavior would touch timing/throttling behavior and could affect daemon responsiveness, connection handling, or denial-of-service characteristics. Without an independent reproduction showing excess CPU or rapid wakeups, a source patch would be speculative and not pull-request-ready.
## Validation
Project-level validation already attempted from the workspace root:
`make` failed because `Module::Build.pm` is missing.
`make check` failed because there is no `check` target.
Focused compile checks:
`perl -T -Ilib -c script/munin-node` passed.
`perl -Ilib -c lib/Munin/Node/Server.pm` passed.
Bounded reproduction to collect before any source patch: run `munin-node --foreground` from the prepared tree with a temporary local config and trace `pselect6/select` timing plus CPU. Only claim `reproduced` if that command shows rapid nonblocking wakeups or sustained CPU, not merely the observed 2-second sleeping poll.
## Patch Pass
Subject: No patch: classify munin-node select samples as idle polling
## Commit Message
No source diff is included. The collected `pselect6` samples line up with `Net::Server::Fork`’s normal idle accept loop, not with a proven munin-node busy loop. `Net::Server::Fork` waits for incoming sockets with `can_read(2)`, which explains the two-second `pselect6` timeouts in the evidence.
## Evidence Confidence
inferred
## Issue Connection
Fixer collected perf, strace, and `/proc` evidence for `/usr/bin/perl -wT /usr/sbin/munin-node --foreground`. The retained signal showed three `pselect6` calls over five seconds, each blocking for about two seconds, while `/proc` reported `State: S (sleeping)`, `wchan: poll_schedule_timeout.constprop.0`, and only about `0.9%` CPU.
The cautious code-level inference is that this is `Net::Server::Fork`’s idle accept loop. Munin’s `Munin::Node::Server` subclasses `Net::Server::Fork`; the installed Perl module sets `multi_port` and its `accept()` path calls `can_read(2)`, which maps directly to the observed two-second poll timeout. The evidence does not include a Perl-level stack, active client request, plugin execution, or rapid nonblocking wakeups.
I did not make a source change. Changing the server accept timeout would alter timing/throttling behavior, and the collected evidence does not reproduce a security or performance bug that would justify that risk. Local conventions checked: `CONTRIBUTING.md`, `HACKING.pod`, `Munin::Common::Timeout::do_with_timeout`, `Munin::Node::OS->run_as_child`, and `Munin::Common::Logger`.
The expected effect is that this proposal is a human-review diagnosis rather than an upstream patch based on an unproven busy-loop report.
## Git Add Paths
None
## Validation
`make` from the workspace root failed:
`Can't locate Module/Build.pm in @INC ... at Build.PL line 80`, followed by `make: *** [Makefile:149: Build] Error 2`.
`make check` from the workspace root failed:
`make: *** No rule to make target 'check'. Stop.`
Focused checks passed:
`perl -T -Ilib -c script/munin-node`
`perl -Ilib -c lib/Munin/Node/Server.pm`
Bounded reproduction attempts were blocked by sandbox limits. `strace` failed with `PTRACE_TRACEME: Operation not permitted`. A minimal `Net::Server::Fork` smoke run failed to bind localhost with `Cannot bind and listen to TCP port 4949 on 127.0.0.1 [Operation not permitted]`. No local command reproduced a runaway CPU failure, so no source patch was left.
## Review Pass 1
RESULT: ok
The first patch pass is acceptable as a no-patch diagnosis. The workspace has no source diff, so there are no code regressions or gittable path issues to reject.
The evidence level is correctly downgraded to `inferred`: the bundle has profiler/strace-style evidence, but no local reproduction and no Perl-level stack tying the wait to a munin-node bug. The explanation stays cautious and does not invent a user-visible crash or confirmed busy loop.
Validation is adequate for a no-patch report: project-level `make` and `make check` were attempted with exact blockers, focused Perl syntax checks were run, and bounded reproduction attempts were reported as blocked by ptrace/network sandbox limits. Local conventions and helpers were checked and named.perl likely remains stuck in a busy-poll loop. A diagnosis report and patch proposal were created locally.
## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.
## Patch Pass
You are working on a bounded fixer proposal.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Produce the smallest reasonable patch for the target repository, keep the change upstreamable, prefer the clearest control flow available, and do not keep avoidable `goto` when a simpler structure would read better. Before introducing new file, process, allocation, locking, networking, or platform APIs, inspect nearby code and project contribution docs for existing helpers or compatibility wrappers and use those local patterns unless you can explain why they do not fit. Validate from a reproducible workspace-root entrypoint before falling back to focused leaf commands; if a build or test cannot run, report the exact command, the exact blocker, and any narrower check you ran instead. During validation, also try one bounded independent reproduction of the collected failure signal when it is safe and cheap, such as a failing test, smoke command, perf/strace comparison, or before/after runtime check. Only use `reproduced` if that command or test actually reproduced the failure; otherwise keep `observed` and report the reproduction blocker. The final explanation must connect the observed issue evidence to the actual code change, not just paraphrase the diff. Write like a maintainer is going to read the patch mail cold: explain the bug in plain language, define subsystem-specific jargon the first time you need it, and make the causal story obvious. Explicitly classify evidence confidence as `reproduced`, `observed`, or `inferred`: `reproduced` means you reproduced the failure locally; `observed` means Fixer has direct crash/log/trace evidence but you did not independently reproduce it; `inferred` means the source patch is not pull-request-ready, so do not leave a source diff unless you first gather stronger observed/reproduced evidence; otherwise return a no-patch diagnosis/report. For any source-changing `observed` patch, say explicitly in `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. Security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior need reproduced evidence plus explicit security-impact analysis before leaving a source diff; otherwise return a no-patch diagnosis/report for human review. If you introduce non-obvious state translation, index remapping, or backend split logic, add a short source comment that explains the invariant being preserved.
Start by explaining the likely root cause from the collected perf, strace, and /proc evidence. If you cannot land a safe patch, leave a diagnosis that is strong enough for an upstream bug report.
Interpreter process expectation: when the hot process is Python, Perl, shell, Node, Ruby, PHP, Lua, or another interpreter, inspect both the runtime and the script/application entrypoint from `details.interpreter_process`. Prefer the script or application package when evidence points there; do not patch the interpreter runtime merely because the hot binary is `python`, `perl`, `bash`, or similar. Runtime fixes are welcome only after checking the entrypoint and explaining why the runtime mishandles the workload or why running bad code faster/safer is itself the right upstream fix.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Keep the change narrowly scoped and summarize validation clearly.
In every authoring pass, your final response must start with `Subject: <single-line git commit subject>` and then include these markdown sections exactly:
## Commit Message
A short upstream-friendly explanation of what changed and why. Write it in plain language that a maintainer can follow without local complaint context. If you use subsystem jargon, define it immediately.
## Evidence Confidence
Exactly one word: `reproduced`, `observed`, or `inferred`. Use `reproduced` only when you reproduced the failure locally with a command or test, and include that command/test in `## Validation`. Use `observed` when Fixer has direct crash/log/trace evidence but you did not independently reproduce it. If `## Git Add Paths` lists source files for an `observed` patch, `## Issue Connection` must explicitly say the failure was observed by Fixer and not independently reproduced. Security-sensitive source changes touching authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior require reproduced evidence and explicit security-impact analysis; otherwise list `None` under `## Git Add Paths` and write a no-patch diagnosis/report. Use `inferred` for profiler/strace/indirect evidence; inferred responses may be no-patch diagnoses or reports, but inferred source patches are not pull-request-ready until stronger evidence is gathered.
## Issue Connection
Write this as maintainer-facing patch mail, not as local Fixer notes. Cover four things explicitly in readable sentences: the user-visible symptom or the exact collected signal, the code-level cause or the cautious inference from evidence, the specific change you made, and the expected effect. Do not invent a reproducer, command line, crash, or user-visible failure that is not present in the evidence bundle. If the evidence is direct-but-not-reproduced, say it was observed by Fixer and not independently reproduced. If the evidence is indirect and you did not gather stronger evidence, do not leave a source diff; write a no-patch diagnosis/report instead. Include an explicit effect sentence such as `The expected effect is ...`, `This should reduce ...`, or `This prevents ...` for source patches. If the logic is non-obvious in code, mention that you added a short explanatory comment.
## Git Add Paths
List the repo-relative paths that belong in the final patch, one per line. Use `None` only when you intentionally made no source changes. Include intentionally new files, and do not list generated build artifacts.
## Validation
List the checks you ran, or say clearly that you could not run them. Include the independent reproduction command/test and result when `## Evidence Confidence` is `reproduced`; if reproduction was attempted but blocked, name the exact blocker and keep confidence at `observed` or `inferred`.
Before editing, read the plan at `./plan-output.txt` and follow it unless the code proves part of it wrong. If you change course, say so explicitly in the final write-up instead of silently drifting from the plan.
## Review Pass 1
You are reviewing a freshly generated fixer patch.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Review the first patch pass. The original pre-edit snapshot is available at `./source` for diffing.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout. The latest author response is at `./patch-output.txt`. Inspect the current code and changed paths like a strict code reviewer. Focus on correctness, regressions, maintainability, awkward control flow such as avoidable `goto`, missing validation, weak or non-gittable commit message text, and explanations that fail to connect the observed issue evidence to the code change. Also review the maintainer experience: the patch mail should be easy to accept upstream, the user-visible bug should be explained in plain language, subsystem-specific jargon should be defined when first used, and any non-obvious state translation or index remapping in code should have a short explanatory comment. Reject patches that omit `## Evidence Confidence`, use anything other than `reproduced`, `observed`, or `inferred`, or sound more certain than that evidence level allows. Reject patches that claim `reproduced` unless `## Validation` names the concrete reproduction command or test and its result. Reject source patches in security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior unless the author reproduced the behavior and explicitly analyzed the security impact of the change; observed-only evidence should become a diagnosis/report, not a PR-ready source diff. Reject patches that invent a reproducer, command line, crash, or user-visible failure not present in the evidence bundle; indirect profiler or strace evidence may justify a cautious mitigation, but the author must say it is indirect instead of presenting it as a confirmed upstream bug. Reject patches that introduce generic libc/std APIs when nearby code or project docs provide a local compat/helper API for the same job, unless the author explicitly justifies the exception. Reject validation that only reports a leaf object/syntax build when a project-level configure/build/test entrypoint exists and was not attempted; if a full build cannot run, the author must show the exact failed command and blocker.
Do not apply code changes in this pass.
Return a short markdown review report. The first non-empty line must be exactly one of:
RESULT: ok
RESULT: fix-needed
If you choose `RESULT: fix-needed`, add a `## Findings` section with concrete, actionable items.## Plan Pass
## Problem
Fixer observed `munin-node` launched as `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` in a repeated `pselect6`/`select` wait. The retained evidence does not include a Perl-level stack or a request/plugin workload tying the samples to munin application logic, and the captured process state was `S (sleeping)` with about `0.9%` CPU and `pselect6` calls timing out after roughly 2 seconds.
## Evidence Confidence
observed
## Proposed Subject
No source patch yet: diagnose whether the observed `munin-node` `pselect6` loop is normal idle `Net::Server::Fork` accept-loop behavior before proposing an upstream code change.
## Patch Plan
1. Do not patch Perl or munin-node from the current evidence alone.
2. Treat `/usr/sbin/munin-node` as the primary target, per the interpreter evidence; only investigate Perl runtime behavior if a script-level reproducer shows Perl mishandling the workload.
3. Confirm whether the `pselect6(..., {tv_sec=2})` pattern comes from `Net::Server::Fork`’s idle accept loop rather than `Munin::Node::Server::process_request`.
4. If additional evidence shows a real tight loop, patch the smallest munin-node layer involved, following local conventions from `CONTRIBUTING.md` and `HACKING.pod`: taint-mode-safe Perl, `use strict`, `use warnings`, clear one-statement-per-line style, no avoidable `goto`, and existing helpers such as `Munin::Common::Timeout::do_with_timeout`, `Munin::Node::OS->run_as_child`, and `Munin::Common::Logger`.
5. No prior Fixer patch needs replacing; the workspace is at `Fixer baseline`.
## Risks
Changing timeout or accept-loop behavior would touch timing/throttling behavior and could affect daemon responsiveness, connection handling, or denial-of-service characteristics. Without an independent reproduction showing excess CPU or rapid wakeups, a source patch would be speculative and not pull-request-ready.
## Validation
Project-level validation already attempted from the workspace root:
`make` failed because `Module::Build.pm` is missing.
`make check` failed because there is no `check` target.
Focused compile checks:
`perl -T -Ilib -c script/munin-node` passed.
`perl -Ilib -c lib/Munin/Node/Server.pm` passed.
Bounded reproduction to collect before any source patch: run `munin-node --foreground` from the prepared tree with a temporary local config and trace `pselect6/select` timing plus CPU. Only claim `reproduced` if that command shows rapid nonblocking wakeups or sustained CPU, not merely the observed 2-second sleeping poll.
## Patch Pass
Subject: No patch: classify munin-node select samples as idle polling
## Commit Message
No source diff is included. The collected `pselect6` samples line up with `Net::Server::Fork`’s normal idle accept loop, not with a proven munin-node busy loop. `Net::Server::Fork` waits for incoming sockets with `can_read(2)`, which explains the two-second `pselect6` timeouts in the evidence.
## Evidence Confidence
inferred
## Issue Connection
Fixer collected perf, strace, and `/proc` evidence for `/usr/bin/perl -wT /usr/sbin/munin-node --foreground`. The retained signal showed three `pselect6` calls over five seconds, each blocking for about two seconds, while `/proc` reported `State: S (sleeping)`, `wchan: poll_schedule_timeout.constprop.0`, and only about `0.9%` CPU.
The cautious code-level inference is that this is `Net::Server::Fork`’s idle accept loop. Munin’s `Munin::Node::Server` subclasses `Net::Server::Fork`; the installed Perl module sets `multi_port` and its `accept()` path calls `can_read(2)`, which maps directly to the observed two-second poll timeout. The evidence does not include a Perl-level stack, active client request, plugin execution, or rapid nonblocking wakeups.
I did not make a source change. Changing the server accept timeout would alter timing/throttling behavior, and the collected evidence does not reproduce a security or performance bug that would justify that risk. Local conventions checked: `CONTRIBUTING.md`, `HACKING.pod`, `Munin::Common::Timeout::do_with_timeout`, `Munin::Node::OS->run_as_child`, and `Munin::Common::Logger`.
The expected effect is that this proposal is a human-review diagnosis rather than an upstream patch based on an unproven busy-loop report.
## Git Add Paths
None
## Validation
`make` from the workspace root failed:
`Can't locate Module/Build.pm in @INC ... at Build.PL line 80`, followed by `make: *** [Makefile:149: Build] Error 2`.
`make check` from the workspace root failed:
`make: *** No rule to make target 'check'. Stop.`
Focused checks passed:
`perl -T -Ilib -c script/munin-node`
`perl -Ilib -c lib/Munin/Node/Server.pm`
Bounded reproduction attempts were blocked by sandbox limits. `strace` failed with `PTRACE_TRACEME: Operation not permitted`. A minimal `Net::Server::Fork` smoke run failed to bind localhost with `Cannot bind and listen to TCP port 4949 on 127.0.0.1 [Operation not permitted]`. No local command reproduced a runaway CPU failure, so no source patch was left.
## Review Pass 1
RESULT: ok
The first patch pass is acceptable as a no-patch diagnosis. The workspace has no source diff, so there are no code regressions or gittable path issues to reject.
The evidence level is correctly downgraded to `inferred`: the bundle has profiler/strace-style evidence, but no local reproduction and no Perl-level stack tying the wait to a munin-node bug. The explanation stays cautious and does not invent a user-visible crash or confirmed busy loop.
Validation is adequate for a no-patch report: project-level `make` and `make check` were attempted with exact blockers, focused Perl syntax checks were run, and bounded reproduction attempts were reported as blocked by ptrace/network sandbox limits. Local conventions and helpers were checked and named.perl likely remains stuck in a busy-poll loop. The diagnosis was captured, but the patch proposal did not complete cleanly.
execution
/usr/bin/perl -wT /usr/sbin/munin-node --foregroundThe trace repeatedly returns to a poll-family syscall without meaningful blocking, which suggests a busy event-loop wakeup.
Thread 1 (Thread 0x7f82eb914b80 (LWP 3947104) "munin-node"):
#0 0x00007f82eb9e87d2 in ?? () from target:<path>
#1 0x00007f82eb9e87ed in ?? () from target:<path>
#2 0x00007f82eba686cf in select () from target:<path>
#3 0x000055b5551b8ee4 in ?? ()
#4 0x000055b55521a496 in Perl_runops_standard ()
#5 0x000055b555100b85 in perl_run ()
#6 0x000055b5550d35ae in main ()## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.## Plan Pass
## Workflow Note
{"type":"turn.started"}
{"type":"error","message":"Reconnecting... 1/5 (stream disconnected before completion: Your authentication token has been invalidated. Please try signing in again.)"}
{"type":"error","message":"Reconnecting... 2/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 3/5 (stream disconnected before completion: Your authentication token has been invalidated. Please try signing in again.)"}
{"type":"error","message":"Reconnecting... 4/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 5/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"We're currently experiencing high demand, which may cause temporary errors."}
{"type":"turn.failed","error":{"message":"We're currently experiencing high demand, which may cause temporary errors."}}perl likely remains stuck in a busy-poll loop. The diagnosis was captured, but the patch proposal did not complete cleanly.
execution
/usr/bin/perl -wT /usr/sbin/munin-node --foregroundThe trace repeatedly returns to a poll-family syscall without meaningful blocking, which suggests a busy event-loop wakeup.
Thread 1 (Thread 0x7f82eb914b80 (LWP 3947104) "munin-node"):
#0 0x00007f82eb9e87d2 in ?? () from target:<path>
#1 0x00007f82eb9e87ed in ?? () from target:<path>
#2 0x00007f82eba686cf in select () from target:<path>
#3 0x000055b5551b8ee4 in ?? ()
#4 0x000055b55521a496 in Perl_runops_standard ()
#5 0x000055b555100b85 in perl_run ()
#6 0x000055b5550d35ae in main ()## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.## Plan Pass
## Workflow Note
{"type":"turn.started"}
{"type":"error","message":"Reconnecting... 1/5 (stream disconnected before completion: Your authentication token has been invalidated. Please try signing in again.)"}
{"type":"error","message":"Reconnecting... 2/5 (stream disconnected before completion: Your authentication token has been invalidated. Please try signing in again.)"}
{"type":"error","message":"Reconnecting... 3/5 (stream disconnected before completion: Your authentication token has been invalidated. Please try signing in again.)"}
{"type":"error","message":"Reconnecting... 4/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 5/5 (stream disconnected before completion: Your authentication token has been invalidated. Please try signing in again.)"}
{"type":"error","message":"We're currently experiencing high demand, which may cause temporary errors."}
{"type":"turn.failed","error":{"message":"We're currently experiencing high demand, which may cause temporary errors."}}perl likely remains stuck in a busy-poll loop. The diagnosis was captured, but the patch proposal did not complete cleanly.
execution
/usr/bin/perl -wT /usr/sbin/munin-node --foregroundThe trace repeatedly returns to a poll-family syscall without meaningful blocking, which suggests a busy event-loop wakeup.
Thread 1 (Thread 0x7f82eb914b80 (LWP 3947104) "munin-node"):
#0 0x00007f82eb9e87d2 in ?? () from target:<path>
#1 0x00007f82eb9e87ed in ?? () from target:<path>
#2 0x00007f82eba686cf in select () from target:<path>
#3 0x000055b5551b8ee4 in ?? ()
#4 0x000055b55521a496 in Perl_runops_standard ()
#5 0x000055b555100b85 in perl_run ()
#6 0x000055b5550d35ae in main ()## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.## Plan Pass
## Workflow Note
{"type":"turn.started"}
{"type":"error","message":"Reconnecting... 1/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 2/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 3/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 4/5 (stream disconnected before completion: Your authentication token has been invalidated. Please try signing in again.)"}
{"type":"error","message":"Reconnecting... 5/5 (stream disconnected before completion: Your authentication token has been invalidated. Please try signing in again.)"}
{"type":"error","message":"We're currently experiencing high demand, which may cause temporary errors."}
{"type":"turn.failed","error":{"message":"We're currently experiencing high demand, which may cause temporary errors."}}perl likely remains stuck in a busy-poll loop. The diagnosis was captured, but the patch proposal did not complete cleanly.
execution
/usr/bin/perl -wT /usr/sbin/munin-node --foregroundThe trace repeatedly returns to a poll-family syscall without meaningful blocking, which suggests a busy event-loop wakeup.
Thread 1 (Thread 0x7f82eb914b80 (LWP 3947104) "munin-node"):
#0 0x00007f82eb9e87d2 in ?? () from target:<path>
#1 0x00007f82eb9e87ed in ?? () from target:<path>
#2 0x00007f82eba686cf in select () from target:<path>
#3 0x000055b5551b8ee4 in ?? ()
#4 0x000055b55521a496 in Perl_runops_standard ()
#5 0x000055b555100b85 in perl_run ()
#6 0x000055b5550d35ae in main ()## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.## Plan Pass
## Workflow Note
{"type":"turn.started"}
{"type":"error","message":"Reconnecting... 1/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 2/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 3/5 (stream disconnected before completion: Your authentication token has been invalidated. Please try signing in again.)"}
{"type":"error","message":"Reconnecting... 4/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 5/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"We're currently experiencing high demand, which may cause temporary errors."}
{"type":"turn.failed","error":{"message":"We're currently experiencing high demand, which may cause temporary errors."}}perl likely remains stuck in a busy-poll loop. The diagnosis was captured, but the patch proposal did not complete cleanly.
execution
/usr/bin/perl -wT /usr/sbin/munin-node --foregroundThe trace repeatedly returns to a poll-family syscall without meaningful blocking, which suggests a busy event-loop wakeup.
Thread 1 (Thread 0x7f82eb914b80 (LWP 3947104) "munin-node"):
#0 0x00007f82eb9e87d2 in ?? () from target:<path>
#1 0x00007f82eb9e87ed in ?? () from target:<path>
#2 0x00007f82eba686cf in select () from target:<path>
#3 0x000055b5551b8ee4 in ?? ()
#4 0x000055b55521a496 in Perl_runops_standard ()
#5 0x000055b555100b85 in perl_run ()
#6 0x000055b5550d35ae in main ()## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.## Plan Pass
## Workflow Note
{"type":"turn.started"}
{"type":"error","message":"Reconnecting... 1/5 (stream disconnected before completion: Your authentication token has been invalidated. Please try signing in again.)"}
{"type":"error","message":"Reconnecting... 2/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 3/5 (stream disconnected before completion: Your authentication token has been invalidated. Please try signing in again.)"}
{"type":"error","message":"Reconnecting... 4/5 (stream disconnected before completion: Your authentication token has been invalidated. Please try signing in again.)"}
{"type":"error","message":"Reconnecting... 5/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"We're currently experiencing high demand, which may cause temporary errors."}
{"type":"turn.failed","error":{"message":"We're currently experiencing high demand, which may cause temporary errors."}}perl likely remains stuck in a busy-poll loop. The diagnosis was captured, but the patch proposal did not complete cleanly.
execution
/usr/bin/perl -wT /usr/sbin/munin-node --foregroundThe trace repeatedly returns to a poll-family syscall without meaningful blocking, which suggests a busy event-loop wakeup.
Thread 1 (Thread 0x7f82eb914b80 (LWP 3947104) "munin-node"):
#0 0x00007f82eb9e87d2 in ?? () from target:<path>
#1 0x00007f82eb9e87ed in ?? () from target:<path>
#2 0x00007f82eba686cf in select () from target:<path>
#3 0x000055b5551b8ee4 in ?? ()
#4 0x000055b55521a496 in Perl_runops_standard ()
#5 0x000055b555100b85 in perl_run ()
#6 0x000055b5550d35ae in main ()## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.## Plan Pass
## Workflow Note
{"type":"turn.started"}
{"type":"error","message":"Reconnecting... 1/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 2/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 3/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 4/5 (stream disconnected before completion: Your authentication token has been invalidated. Please try signing in again.)"}
{"type":"error","message":"Reconnecting... 5/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"We're currently experiencing high demand, which may cause temporary errors."}
{"type":"turn.failed","error":{"message":"We're currently experiencing high demand, which may cause temporary errors."}}perl likely remains stuck in a busy-poll loop. The diagnosis was captured, but the patch proposal did not complete cleanly.
execution
/usr/bin/perl -wT /usr/sbin/munin-node --foregroundThe trace repeatedly returns to a poll-family syscall without meaningful blocking, which suggests a busy event-loop wakeup.
Thread 1 (Thread 0x7f82eb914b80 (LWP 3947104) "munin-node"):
#0 0x00007f82eb9e87d2 in ?? () from target:<path>
#1 0x00007f82eb9e87ed in ?? () from target:<path>
#2 0x00007f82eba686cf in select () from target:<path>
#3 0x000055b5551b8ee4 in ?? ()
#4 0x000055b55521a496 in Perl_runops_standard ()
#5 0x000055b555100b85 in perl_run ()
#6 0x000055b5550d35ae in main ()## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.## Plan Pass
## Workflow Note
{"type":"turn.started"}
{"type":"error","message":"Reconnecting... 1/5 (stream disconnected before completion: Your authentication token has been invalidated. Please try signing in again.)"}
{"type":"error","message":"Reconnecting... 2/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 3/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 4/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 5/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"We're currently experiencing high demand, which may cause temporary errors."}
{"type":"turn.failed","error":{"message":"We're currently experiencing high demand, which may cause temporary errors."}}perl likely remains stuck in a busy-poll loop. The diagnosis was captured, but the patch proposal did not complete cleanly.
execution
/usr/bin/perl -wT /usr/sbin/munin-node --foregroundThe trace repeatedly returns to a poll-family syscall without meaningful blocking, which suggests a busy event-loop wakeup.
Thread 1 (Thread 0x7f82eb914b80 (LWP 3947104) "munin-node"):
#0 0x00007f82eb9e87d2 in ?? () from target:<path>
#1 0x00007f82eb9e87ed in ?? () from target:<path>
#2 0x00007f82eba686cf in select () from target:<path>
#3 0x000055b5551b8ee4 in ?? ()
#4 0x000055b55521a496 in Perl_runops_standard ()
#5 0x000055b555100b85 in perl_run ()
#6 0x000055b5550d35ae in main ()## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.## Plan Pass
## Workflow Note
{"type":"turn.started"}
{"type":"error","message":"Reconnecting... 1/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 2/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 3/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 4/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 5/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"We're currently experiencing high demand, which may cause temporary errors."}
{"type":"turn.failed","error":{"message":"We're currently experiencing high demand, which may cause temporary errors."}}perl likely remains stuck in a busy-poll loop. The diagnosis was captured, but the patch proposal did not complete cleanly.
execution
/usr/bin/perl -wT /usr/sbin/munin-node --foregroundThe trace repeatedly returns to a poll-family syscall without meaningful blocking, which suggests a busy event-loop wakeup.
Thread 1 (Thread 0x7f82eb914b80 (LWP 3947104) "munin-node"):
#0 0x00007f82eb9e87d2 in ?? () from target:<path>
#1 0x00007f82eb9e87ed in ?? () from target:<path>
#2 0x00007f82eba686cf in select () from target:<path>
#3 0x000055b5551b8ee4 in ?? ()
#4 0x000055b55521a496 in Perl_runops_standard ()
#5 0x000055b555100b85 in perl_run ()
#6 0x000055b5550d35ae in main ()## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.## Plan Pass
## Workflow Note
{"type":"turn.started"}
{"type":"error","message":"Reconnecting... 1/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 2/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 3/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 4/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 5/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"We're currently experiencing high demand, which may cause temporary errors."}
{"type":"turn.failed","error":{"message":"We're currently experiencing high demand, which may cause temporary errors."}}perl likely remains stuck in a busy-poll loop. The diagnosis was captured, but the patch proposal did not complete cleanly.
execution
/usr/bin/perl -wT /usr/sbin/munin-node --foregroundThe trace repeatedly returns to a poll-family syscall without meaningful blocking, which suggests a busy event-loop wakeup.
Thread 1 (Thread 0x7f82eb914b80 (LWP 3947104) "munin-node"):
#0 0x00007f82eb9e87d2 in ?? () from target:<path>
#1 0x00007f82eb9e87ed in ?? () from target:<path>
#2 0x00007f82eba686cf in select () from target:<path>
#3 0x000055b5551b8ee4 in ?? ()
#4 0x000055b55521a496 in Perl_runops_standard ()
#5 0x000055b555100b85 in perl_run ()
#6 0x000055b5550d35ae in main ()## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.## Plan Pass
## Workflow Note
{"type":"turn.started"}
{"type":"error","message":"Reconnecting... 1/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 2/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 3/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 4/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 5/5 (stream disconnected before completion: Your authentication token has been invalidated. Please try signing in again.)"}
{"type":"error","message":"We're currently experiencing high demand, which may cause temporary errors."}
{"type":"turn.failed","error":{"message":"We're currently experiencing high demand, which may cause temporary errors."}}perl likely remains stuck in a busy-poll loop. The diagnosis was captured, but the patch proposal did not complete cleanly.
execution
/usr/bin/perl -wT /usr/sbin/munin-node --foregroundThe trace repeatedly returns to a poll-family syscall without meaningful blocking, which suggests a busy event-loop wakeup.
Thread 1 (Thread 0x7f82eb914b80 (LWP 3947104) "munin-node"):
#0 0x00007f82eb9e87d2 in ?? () from target:<path>
#1 0x00007f82eb9e87ed in ?? () from target:<path>
#2 0x00007f82eba686cf in select () from target:<path>
#3 0x000055b5551b8ee4 in ?? ()
#4 0x000055b55521a496 in Perl_runops_standard ()
#5 0x000055b555100b85 in perl_run ()
#6 0x000055b5550d35ae in main ()## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.## Plan Pass
## Workflow Note
{"type":"turn.started"}
{"type":"error","message":"Reconnecting... 1/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 2/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 3/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 4/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 5/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"We're currently experiencing high demand, which may cause temporary errors."}
{"type":"turn.failed","error":{"message":"We're currently experiencing high demand, which may cause temporary errors."}}perl likely remains stuck in a busy-poll loop. The diagnosis was captured, but the patch proposal did not complete cleanly.
execution
/usr/bin/perl -wT /usr/sbin/munin-node --foregroundThe trace repeatedly returns to a poll-family syscall without meaningful blocking, which suggests a busy event-loop wakeup.
Thread 1 (Thread 0x7f82eb914b80 (LWP 3947104) "munin-node"):
#0 0x00007f82eb9e87d2 in ?? () from target:<path>
#1 0x00007f82eb9e87ed in ?? () from target:<path>
#2 0x00007f82eba686cf in select () from target:<path>
#3 0x000055b5551b8ee4 in ?? ()
#4 0x000055b55521a496 in Perl_runops_standard ()
#5 0x000055b555100b85 in perl_run ()
#6 0x000055b5550d35ae in main ()## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.## Plan Pass
## Workflow Note
{"type":"turn.started"}
{"type":"error","message":"Reconnecting... 1/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 2/5 (stream disconnected before completion: Your authentication token has been invalidated. Please try signing in again.)"}
{"type":"error","message":"Reconnecting... 3/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 4/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 5/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"We're currently experiencing high demand, which may cause temporary errors."}
{"type":"turn.failed","error":{"message":"We're currently experiencing high demand, which may cause temporary errors."}}perl likely remains stuck in a busy-poll loop. The diagnosis was captured, but the patch proposal did not complete cleanly.
execution
/usr/bin/perl -wT /usr/sbin/munin-node --foregroundThe trace repeatedly returns to a poll-family syscall without meaningful blocking, which suggests a busy event-loop wakeup.
Thread 1 (Thread 0x7f82eb914b80 (LWP 3947104) "munin-node"):
#0 0x00007f82eb9e87d2 in ?? () from target:<path>
#1 0x00007f82eb9e87ed in ?? () from target:<path>
#2 0x00007f82eba686cf in select () from target:<path>
#3 0x000055b5551b8ee4 in ?? ()
#4 0x000055b55521a496 in Perl_runops_standard ()
#5 0x000055b555100b85 in perl_run ()
#6 0x000055b5550d35ae in main ()## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.## Plan Pass
## Workflow Note
{"type":"turn.started"}
{"type":"error","message":"Reconnecting... 1/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 2/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 3/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 4/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 5/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"We're currently experiencing high demand, which may cause temporary errors."}
{"type":"turn.failed","error":{"message":"We're currently experiencing high demand, which may cause temporary errors."}}perl likely remains stuck in a busy-poll loop. The diagnosis was captured, but the patch proposal did not complete cleanly.
execution
/usr/bin/perl -wT /usr/sbin/munin-node --foregroundThe trace repeatedly returns to a poll-family syscall without meaningful blocking, which suggests a busy event-loop wakeup.
Thread 1 (Thread 0x7f82eb914b80 (LWP 3947104) "munin-node"):
#0 0x00007f82eb9e87d2 in ?? () from target:<path>
#1 0x00007f82eb9e87ed in ?? () from target:<path>
#2 0x00007f82eba686cf in select () from target:<path>
#3 0x000055b5551b8ee4 in ?? ()
#4 0x000055b55521a496 in Perl_runops_standard ()
#5 0x000055b555100b85 in perl_run ()
#6 0x000055b5550d35ae in main ()## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.## Plan Pass
## Workflow Note
{"type":"turn.started"}
{"type":"error","message":"Reconnecting... 1/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 2/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 3/5 (stream disconnected before completion: Your authentication token has been invalidated. Please try signing in again.)"}
{"type":"error","message":"Reconnecting... 4/5 (stream disconnected before completion: Your authentication token has been invalidated. Please try signing in again.)"}
{"type":"error","message":"Reconnecting... 5/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"We're currently experiencing high demand, which may cause temporary errors."}
{"type":"turn.failed","error":{"message":"We're currently experiencing high demand, which may cause temporary errors."}}perl likely remains stuck in a busy-poll loop. The diagnosis was captured, but the patch proposal did not complete cleanly.
execution
/usr/bin/perl -wT /usr/sbin/munin-node --foregroundThe trace repeatedly returns to a poll-family syscall without meaningful blocking, which suggests a busy event-loop wakeup.
Thread 1 (Thread 0x7f82eb914b80 (LWP 3947104) "munin-node"):
#0 0x00007f82eb9e87d2 in ?? () from target:<path>
#1 0x00007f82eb9e87ed in ?? () from target:<path>
#2 0x00007f82eba686cf in select () from target:<path>
#3 0x000055b5551b8ee4 in ?? ()
#4 0x000055b55521a496 in Perl_runops_standard ()
#5 0x000055b555100b85 in perl_run ()
#6 0x000055b5550d35ae in main ()## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.## Plan Pass
## Workflow Note
{"type":"turn.started"}
{"type":"error","message":"Reconnecting... 1/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 2/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 3/5 (stream disconnected before completion: Your authentication token has been invalidated. Please try signing in again.)"}
{"type":"error","message":"Reconnecting... 4/5 (stream disconnected before completion: Your authentication token has been invalidated. Please try signing in again.)"}
{"type":"error","message":"Reconnecting... 5/5 (stream disconnected before completion: Your authentication token has been invalidated. Please try signing in again.)"}
{"type":"error","message":"stream disconnected before completion: Your authentication token has been invalidated. Please try signing in again."}
{"type":"turn.failed","error":{"message":"stream disconnected before completion: Your authentication token has been invalidated. Please try signing in again."}}perl likely remains stuck in a busy-poll loop. The diagnosis was captured, but the patch proposal did not complete cleanly.
execution
/usr/bin/perl -wT /usr/sbin/munin-node --foregroundThe trace repeatedly returns to a poll-family syscall without meaningful blocking, which suggests a busy event-loop wakeup.
Thread 1 (Thread 0x7f82eb914b80 (LWP 3947104) "munin-node"):
#0 0x00007f82eb9e87d2 in ?? () from target:<path>
#1 0x00007f82eb9e87ed in ?? () from target:<path>
#2 0x00007f82eba686cf in select () from target:<path>
#3 0x000055b5551b8ee4 in ?? ()
#4 0x000055b55521a496 in Perl_runops_standard ()
#5 0x000055b555100b85 in perl_run ()
#6 0x000055b5550d35ae in main ()## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.## Plan Pass
## Workflow Note
{"type":"turn.started"}
{"type":"error","message":"Reconnecting... 1/5 (stream disconnected before completion: Your authentication token has been invalidated. Please try signing in again.)"}
{"type":"error","message":"Reconnecting... 2/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 3/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 4/5 (stream disconnected before completion: Your authentication token has been invalidated. Please try signing in again.)"}
{"type":"error","message":"Reconnecting... 5/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"We're currently experiencing high demand, which may cause temporary errors."}
{"type":"turn.failed","error":{"message":"We're currently experiencing high demand, which may cause temporary errors."}}perl likely remains stuck in a busy-poll loop. The diagnosis was captured, but the patch proposal did not complete cleanly.
execution
/usr/bin/perl -wT /usr/sbin/munin-node --foregroundThe trace repeatedly returns to a poll-family syscall without meaningful blocking, which suggests a busy event-loop wakeup.
Thread 1 (Thread 0x7f82eb914b80 (LWP 3947104) "munin-node"):
#0 0x00007f82eb9e87d2 in ?? () from target:<path>
#1 0x00007f82eb9e87ed in ?? () from target:<path>
#2 0x00007f82eba686cf in select () from target:<path>
#3 0x000055b5551b8ee4 in ?? ()
#4 0x000055b55521a496 in Perl_runops_standard ()
#5 0x000055b555100b85 in perl_run ()
#6 0x000055b5550d35ae in main ()## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.## Plan Pass
## Workflow Note
{"type":"turn.started"}
{"type":"error","message":"Reconnecting... 1/5 (stream disconnected before completion: Your authentication token has been invalidated. Please try signing in again.)"}
{"type":"error","message":"Reconnecting... 2/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 3/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 4/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 5/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"stream disconnected before completion: Your authentication token has been invalidated. Please try signing in again."}
{"type":"turn.failed","error":{"message":"stream disconnected before completion: Your authentication token has been invalidated. Please try signing in again."}}perl likely remains stuck in a busy-poll loop. The diagnosis was captured, but the patch proposal did not complete cleanly.
execution
/usr/bin/perl -wT /usr/sbin/munin-node --foregroundThe trace repeatedly returns to a poll-family syscall without meaningful blocking, which suggests a busy event-loop wakeup.
Thread 1 (Thread 0x7f82eb914b80 (LWP 3947104) "munin-node"):
#0 0x00007f82eb9e87d2 in ?? () from target:<path>
#1 0x00007f82eb9e87ed in ?? () from target:<path>
#2 0x00007f82eba686cf in select () from target:<path>
#3 0x000055b5551b8ee4 in ?? ()
#4 0x000055b55521a496 in Perl_runops_standard ()
#5 0x000055b555100b85 in perl_run ()
#6 0x000055b5550d35ae in main ()## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.## Plan Pass
## Workflow Note
{"type":"turn.started"}
{"type":"error","message":"Reconnecting... 1/5 (stream disconnected before completion: Your authentication token has been invalidated. Please try signing in again.)"}
{"type":"error","message":"Reconnecting... 2/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 3/5 (stream disconnected before completion: Your authentication token has been invalidated. Please try signing in again.)"}
{"type":"error","message":"Reconnecting... 4/5 (stream disconnected before completion: Your authentication token has been invalidated. Please try signing in again.)"}
{"type":"error","message":"Reconnecting... 5/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"stream disconnected before completion: Your authentication token has been invalidated. Please try signing in again."}
{"type":"turn.failed","error":{"message":"stream disconnected before completion: Your authentication token has been invalidated. Please try signing in again."}}perl likely remains stuck in a busy-poll loop. The diagnosis was captured, but the patch proposal did not complete cleanly.
execution
/usr/bin/perl -wT /usr/sbin/munin-node --foregroundThe trace repeatedly returns to a poll-family syscall without meaningful blocking, which suggests a busy event-loop wakeup.
Thread 1 (Thread 0x7f82eb914b80 (LWP 3947104) "munin-node"):
#0 0x00007f82eb9e87d2 in ?? () from target:<path>
#1 0x00007f82eb9e87ed in ?? () from target:<path>
#2 0x00007f82eba686cf in select () from target:<path>
#3 0x000055b5551b8ee4 in ?? ()
#4 0x000055b55521a496 in Perl_runops_standard ()
#5 0x000055b555100b85 in perl_run ()
#6 0x000055b5550d35ae in main ()## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.## Plan Pass
## Workflow Note
{"type":"turn.started"}
{"type":"error","message":"Reconnecting... 1/5 (stream disconnected before completion: Your authentication token has been invalidated. Please try signing in again.)"}
{"type":"error","message":"Reconnecting... 2/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 3/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 4/5 (stream disconnected before completion: Your authentication token has been invalidated. Please try signing in again.)"}
{"type":"error","message":"Reconnecting... 5/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"stream disconnected before completion: Your authentication token has been invalidated. Please try signing in again."}
{"type":"turn.failed","error":{"message":"stream disconnected before completion: Your authentication token has been invalidated. Please try signing in again."}}perl likely remains stuck in a busy-poll loop. The diagnosis was captured, but the patch proposal did not complete cleanly.
execution
/usr/bin/perl -wT /usr/sbin/munin-node --foregroundThe trace repeatedly returns to a poll-family syscall without meaningful blocking, which suggests a busy event-loop wakeup.
Thread 1 (Thread 0x7f82eb914b80 (LWP 3947104) "munin-node"):
#0 0x00007f82eb9e87d2 in ?? () from target:<path>
#1 0x00007f82eb9e87ed in ?? () from target:<path>
#2 0x00007f82eba686cf in select () from target:<path>
#3 0x000055b5551b8ee4 in ?? ()
#4 0x000055b55521a496 in Perl_runops_standard ()
#5 0x000055b555100b85 in perl_run ()
#6 0x000055b5550d35ae in main ()## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.## Plan Pass
## Workflow Note
{"type":"turn.started"}
{"type":"error","message":"Reconnecting... 1/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 2/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 3/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 4/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 5/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"We're currently experiencing high demand, which may cause temporary errors."}
{"type":"turn.failed","error":{"message":"We're currently experiencing high demand, which may cause temporary errors."}}perl likely remains stuck in a busy-poll loop. The diagnosis was captured, but the patch proposal did not complete cleanly.
execution
/usr/bin/perl -wT /usr/sbin/munin-node --foregroundThe trace repeatedly returns to a poll-family syscall without meaningful blocking, which suggests a busy event-loop wakeup.
Thread 1 (Thread 0x7f82eb914b80 (LWP 3947104) "munin-node"):
#0 0x00007f82eb9e87d2 in ?? () from target:<path>
#1 0x00007f82eb9e87ed in ?? () from target:<path>
#2 0x00007f82eba686cf in select () from target:<path>
#3 0x000055b5551b8ee4 in ?? ()
#4 0x000055b55521a496 in Perl_runops_standard ()
#5 0x000055b555100b85 in perl_run ()
#6 0x000055b5550d35ae in main ()## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.## Plan Pass
## Workflow Note
{"type":"turn.started"}
{"type":"error","message":"Reconnecting... 1/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 2/5 (stream disconnected before completion: Your authentication token has been invalidated. Please try signing in again.)"}
{"type":"error","message":"Reconnecting... 3/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 4/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 5/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"We're currently experiencing high demand, which may cause temporary errors."}
{"type":"turn.failed","error":{"message":"We're currently experiencing high demand, which may cause temporary errors."}}perl likely remains stuck in a busy-poll loop. The diagnosis was captured, but the patch proposal did not complete cleanly.
execution
/usr/bin/perl -wT /usr/sbin/munin-node --foregroundThe trace repeatedly returns to a poll-family syscall without meaningful blocking, which suggests a busy event-loop wakeup.
Thread 1 (Thread 0x7f82eb914b80 (LWP 3947104) "munin-node"):
#0 0x00007f82eb9e87d2 in ?? () from target:<path>
#1 0x00007f82eb9e87ed in ?? () from target:<path>
#2 0x00007f82eba686cf in select () from target:<path>
#3 0x000055b5551b8ee4 in ?? ()
#4 0x000055b55521a496 in Perl_runops_standard ()
#5 0x000055b555100b85 in perl_run ()
#6 0x000055b5550d35ae in main ()## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.## Plan Pass
## Workflow Note
{"type":"turn.started"}
{"type":"error","message":"Reconnecting... 1/5 (stream disconnected before completion: Your authentication token has been invalidated. Please try signing in again.)"}
{"type":"error","message":"Reconnecting... 2/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 3/5 (stream disconnected before completion: Your authentication token has been invalidated. Please try signing in again.)"}
{"type":"error","message":"Reconnecting... 4/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 5/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"We're currently experiencing high demand, which may cause temporary errors."}
{"type":"turn.failed","error":{"message":"We're currently experiencing high demand, which may cause temporary errors."}}perl likely remains stuck in a busy-poll loop. The diagnosis was captured, but the patch proposal did not complete cleanly.
execution
/usr/bin/perl -wT /usr/sbin/munin-node --foregroundThe trace repeatedly returns to a poll-family syscall without meaningful blocking, which suggests a busy event-loop wakeup.
Thread 1 (Thread 0x7f82eb914b80 (LWP 3947104) "munin-node"):
#0 0x00007f82eb9e87d2 in ?? () from target:<path>
#1 0x00007f82eb9e87ed in ?? () from target:<path>
#2 0x00007f82eba686cf in select () from target:<path>
#3 0x000055b5551b8ee4 in ?? ()
#4 0x000055b55521a496 in Perl_runops_standard ()
#5 0x000055b555100b85 in perl_run ()
#6 0x000055b5550d35ae in main ()## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.## Plan Pass
## Workflow Note
{"type":"turn.started"}
{"type":"error","message":"Reconnecting... 1/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 2/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 3/5 (stream disconnected before completion: Your authentication token has been invalidated. Please try signing in again.)"}
{"type":"error","message":"Reconnecting... 4/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 5/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"We're currently experiencing high demand, which may cause temporary errors."}
{"type":"turn.failed","error":{"message":"We're currently experiencing high demand, which may cause temporary errors."}}perl likely remains stuck in a busy-poll loop. The diagnosis was captured, but the patch proposal did not complete cleanly.
execution
/usr/bin/perl -wT /usr/sbin/munin-node --foregroundThe trace repeatedly returns to a poll-family syscall without meaningful blocking, which suggests a busy event-loop wakeup.
Thread 1 (Thread 0x7f82eb914b80 (LWP 3947104) "munin-node"):
#0 0x00007f82eb9e87d2 in ?? () from target:<path>
#1 0x00007f82eb9e87ed in ?? () from target:<path>
#2 0x00007f82eba686cf in select () from target:<path>
#3 0x000055b5551b8ee4 in ?? ()
#4 0x000055b55521a496 in Perl_runops_standard ()
#5 0x000055b555100b85 in perl_run ()
#6 0x000055b5550d35ae in main ()## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.## Plan Pass
## Workflow Note
{"type":"turn.started"}
{"type":"error","message":"Reconnecting... 1/5 (stream disconnected before completion: Your authentication token has been invalidated. Please try signing in again.)"}
{"type":"error","message":"Reconnecting... 2/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 3/5 (We're currently experiencing high demand, which may cause temporary errors.)"}
{"type":"error","message":"Reconnecting... 4/5 (stream disconnected before completion: Your authentication token has been invalidated. Please try signing in again.)"}
{"type":"error","message":"Reconnecting... 5/5 (stream disconnected before completion: Your authentication token has been invalidated. Please try signing in again.)"}
{"type":"error","message":"We're currently experiencing high demand, which may cause temporary errors."}
{"type":"turn.failed","error":{"message":"We're currently experiencing high demand, which may cause temporary errors."}}perl likely remains stuck in a busy-poll loop. A diagnosis report and patch proposal were created locally.
## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.
## Patch Pass
You are working on a bounded fixer proposal.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Produce the smallest reasonable patch for the target repository, keep the change upstreamable, prefer the clearest control flow available, and do not keep avoidable `goto` when a simpler structure would read better. Before introducing new file, process, allocation, locking, networking, or platform APIs, inspect nearby code and project contribution docs for existing helpers or compatibility wrappers and use those local patterns unless you can explain why they do not fit. Validate from a reproducible workspace-root entrypoint before falling back to focused leaf commands; if a build or test cannot run, report the exact command, the exact blocker, and any narrower check you ran instead. During validation, also try one bounded independent reproduction of the collected failure signal when it is safe and cheap, such as a failing test, smoke command, perf/strace comparison, or before/after runtime check. Only use `reproduced` if that command or test actually reproduced the failure; otherwise keep `observed` and report the reproduction blocker. The final explanation must connect the observed issue evidence to the actual code change, not just paraphrase the diff. Write like a maintainer is going to read the patch mail cold: explain the bug in plain language, define subsystem-specific jargon the first time you need it, and make the causal story obvious. Explicitly classify evidence confidence as `reproduced`, `observed`, or `inferred`: `reproduced` means you reproduced the failure locally; `observed` means Fixer has direct crash/log/trace evidence but you did not independently reproduce it; `inferred` means the source patch is not pull-request-ready, so do not leave a source diff unless you first gather stronger observed/reproduced evidence; otherwise return a no-patch diagnosis/report. For any source-changing `observed` patch, say explicitly in `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. Security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior need reproduced evidence plus explicit security-impact analysis before leaving a source diff; otherwise return a no-patch diagnosis/report for human review. If you introduce non-obvious state translation, index remapping, or backend split logic, add a short source comment that explains the invariant being preserved.
Start by explaining the likely root cause from the collected perf, strace, and /proc evidence. If you cannot land a safe patch, leave a diagnosis that is strong enough for an upstream bug report.
Interpreter process expectation: when the hot process is Python, Perl, shell, Node, Ruby, PHP, Lua, or another interpreter, inspect both the runtime and the script/application entrypoint from `details.interpreter_process`. Prefer the script or application package when evidence points there; do not patch the interpreter runtime merely because the hot binary is `python`, `perl`, `bash`, or similar. Runtime fixes are welcome only after checking the entrypoint and explaining why the runtime mishandles the workload or why running bad code faster/safer is itself the right upstream fix.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Keep the change narrowly scoped and summarize validation clearly.
In every authoring pass, your final response must start with `Subject: <single-line git commit subject>` and then include these markdown sections exactly:
## Commit Message
A short upstream-friendly explanation of what changed and why. Write it in plain language that a maintainer can follow without local complaint context. If you use subsystem jargon, define it immediately.
## Evidence Confidence
Exactly one word: `reproduced`, `observed`, or `inferred`. Use `reproduced` only when you reproduced the failure locally with a command or test, and include that command/test in `## Validation`. Use `observed` when Fixer has direct crash/log/trace evidence but you did not independently reproduce it. If `## Git Add Paths` lists source files for an `observed` patch, `## Issue Connection` must explicitly say the failure was observed by Fixer and not independently reproduced. Security-sensitive source changes touching authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior require reproduced evidence and explicit security-impact analysis; otherwise list `None` under `## Git Add Paths` and write a no-patch diagnosis/report. Use `inferred` for profiler/strace/indirect evidence; inferred responses may be no-patch diagnoses or reports, but inferred source patches are not pull-request-ready until stronger evidence is gathered.
## Issue Connection
Write this as maintainer-facing patch mail, not as local Fixer notes. Cover four things explicitly in readable sentences: the user-visible symptom or the exact collected signal, the code-level cause or the cautious inference from evidence, the specific change you made, and the expected effect. Do not invent a reproducer, command line, crash, or user-visible failure that is not present in the evidence bundle. If the evidence is direct-but-not-reproduced, say it was observed by Fixer and not independently reproduced. If the evidence is indirect and you did not gather stronger evidence, do not leave a source diff; write a no-patch diagnosis/report instead. Include an explicit effect sentence such as `The expected effect is ...`, `This should reduce ...`, or `This prevents ...` for source patches. If the logic is non-obvious in code, mention that you added a short explanatory comment.
## Git Add Paths
List the repo-relative paths that belong in the final patch, one per line. Use `None` only when you intentionally made no source changes. Include intentionally new files, and do not list generated build artifacts.
## Validation
List the checks you ran, or say clearly that you could not run them. Include the independent reproduction command/test and result when `## Evidence Confidence` is `reproduced`; if reproduction was attempted but blocked, name the exact blocker and keep confidence at `observed` or `inferred`.
Before editing, read the plan at `./plan-output.txt` and follow it unless the code proves part of it wrong. If you change course, say so explicitly in the final write-up instead of silently drifting from the plan.
## Review Pass 1
You are reviewing a freshly generated fixer patch.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Review the first patch pass. The original pre-edit snapshot is available at `./source` for diffing.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout. The latest author response is at `./patch-output.txt`. Inspect the current code and changed paths like a strict code reviewer. Focus on correctness, regressions, maintainability, awkward control flow such as avoidable `goto`, missing validation, weak or non-gittable commit message text, and explanations that fail to connect the observed issue evidence to the code change. Also review the maintainer experience: the patch mail should be easy to accept upstream, the user-visible bug should be explained in plain language, subsystem-specific jargon should be defined when first used, and any non-obvious state translation or index remapping in code should have a short explanatory comment. Reject patches that omit `## Evidence Confidence`, use anything other than `reproduced`, `observed`, or `inferred`, or sound more certain than that evidence level allows. Reject patches that claim `reproduced` unless `## Validation` names the concrete reproduction command or test and its result. Reject source patches in security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior unless the author reproduced the behavior and explicitly analyzed the security impact of the change; observed-only evidence should become a diagnosis/report, not a PR-ready source diff. Reject patches that invent a reproducer, command line, crash, or user-visible failure not present in the evidence bundle; indirect profiler or strace evidence may justify a cautious mitigation, but the author must say it is indirect instead of presenting it as a confirmed upstream bug. Reject patches that introduce generic libc/std APIs when nearby code or project docs provide a local compat/helper API for the same job, unless the author explicitly justifies the exception. Reject validation that only reports a leaf object/syntax build when a project-level configure/build/test entrypoint exists and was not attempted; if a full build cannot run, the author must show the exact failed command and blocker.
Do not apply code changes in this pass.
Return a short markdown review report. The first non-empty line must be exactly one of:
RESULT: ok
RESULT: fix-needed
If you choose `RESULT: fix-needed`, add a `## Findings` section with concrete, actionable items.## Plan Pass
## Problem
Fixer observed `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` in `select`/`pselect6`, but the retained syscall evidence shows blocking waits of about 1.8s and 2.0s, process state `S (sleeping)`, and only 0.9% CPU. That matches Net::Server::Fork’s normal parent accept loop, which calls `can_read(2)`, more than a proven munin busy-poll bug.
## Evidence Confidence
observed
## Proposed Subject
No upstream source patch yet: diagnose this as insufficient/contradictory evidence for a munin code change.
## Patch Plan
Do not edit munin source in this pass. The evidence is profiler-only at the Perl/native boundary and lacks a Perl-level stack tying the loop to `script/munin-node`, `Munin::Node::Server`, or plugin execution.
If later evidence shows a real tight loop, investigate `lib/Munin/Node/Server.pm` first, then `lib/Munin/Node/OS.pm`, following `HACKING.pod` conventions: taint-safe Perl, `strict`/`warnings`, `English`, existing logging via `Munin::Common::Logger`, and bounded work via `Munin::Common::Timeout::do_with_timeout`. No relevant local helper was found for replacing Net::Server’s accept-loop `select`; Net::Server owns that logic.
No prior Fixer patch is present to improve or replace. Avoid adding awkward control flow such as `goto`; any future mitigation should be a small bounded conditional or timeout/config handling change with a direct reproducer.
## Risks
Patching now would likely change normal daemon idle behavior based on a false positive. The observed 2-second `pselect6` timeout is consistent with Net::Server::Fork, and changing it could affect signal handling, connection acceptance latency, or child reaping without addressing a demonstrated bug.
## Validation
For any later patch, first run project-level validation from the workspace root: `make`, then `make test`. There is no `make check` target in the inspected `Makefile`.
Bounded independent reproduction before editing: after `make`, start `munin-node` from the built tree with a temporary config/plugin directory under `timeout`, attach `strace -ttT -e trace=pselect6,select,poll,ppoll`, and verify whether waits are genuinely near-zero busy polling or normal ~2s idle accepts. Do not claim reproduced unless that command shows the tight-loop failure.
## Patch Pass
Subject: Diagnose munin-node idle select evidence
## Commit Message
No source change. The collected evidence points to `munin-node` idling in Net::Server::Fork’s accept loop, not to a proven busy poll in Munin or Perl. Net::Server::Fork uses `IO::Select->can_read(2)`, a two-second blocking wait for incoming sockets, and the retained `/proc` and `strace` data match that shape.
## Evidence Confidence
inferred
## Issue Connection
Fixer collected a Perl process running `/usr/sbin/munin-node --foreground` with native frames under `select`, repeated `pselect6`, process state `S (sleeping)`, `wchan` at `poll_schedule_timeout`, and only 0.9% CPU. The likely root cause is a heuristic mismatch: the process was sampled while sleeping in the daemon’s accept loop, and the retained `strace` entries show blocking waits of about 1.8s and 2.0s rather than a tight zero-timeout loop.
I inspected the script entrypoint `script/munin-node`, the node server implementation in `lib/Munin/Node/Server.pm`, and the runtime library path used by the server. `Munin::Node::Server` inherits Net::Server::Fork, and the relevant accept wait is in Net::Server::Fork’s `can_read(2)` call, not in Munin request processing. Munin’s local conventions from `CONTRIBUTING.md` and `HACKING.pod` are taint-safe Perl with `strict`/`warnings`, `English`, logging through `Munin::Common::Logger`, and bounded work through `Munin::Common::Timeout::do_with_timeout`; no relevant local helper was found for replacing Net::Server’s accept-loop wait.
I made no source change because the evidence is indirect and contradictory for a source patch. The expected effect is to avoid an upstream patch that would alter normal idle daemon behavior without a reproduced busy-poll failure.
## Git Add Paths
None
## Validation
`make` from the workspace root failed before building: `Can't locate Module/Build.pm in @INC ... at Build.PL line 80`, followed by `make: *** [Makefile:149: Build] Error 2`.
`make -n check` failed because this tree has no `check` target: `make: *** No rule to make target 'check'. Stop.`
Focused check run: `perl -c lib/Munin/Node/Server.pm` passed with `syntax OK`.
Independent reproduction attempt: `timeout 6s strace -ttT -e trace=pselect6,select,poll,ppoll perl -MNet::Server::Fork ...` was blocked by sandbox ptrace restrictions: `PTRACE_TRACEME: Operation not permitted`. As a fallback, `/usr/bin/time ... perl -MIO::Select ... can_read(2)` completed three waits in `elapsed=6.00 cpu=0%`, which did not reproduce a busy poll and matches the collected multi-second `pselect6` waits.
## Review Pass 1
RESULT: ok
No source diff is present, and that is appropriate for the evidence level. The report keeps confidence at `inferred`, does not claim reproduction, explains the likely Net::Server::Fork idle `can_read(2)` path, names the Munin style/helper conventions checked, and reports the project-level validation blockers with exact failures.perl likely remains stuck in a busy-poll loop. A diagnosis report and patch proposal were created locally.
## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.
## Patch Pass
You are working on a bounded fixer proposal.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Produce the smallest reasonable patch for the target repository, keep the change upstreamable, prefer the clearest control flow available, and do not keep avoidable `goto` when a simpler structure would read better. Before introducing new file, process, allocation, locking, networking, or platform APIs, inspect nearby code and project contribution docs for existing helpers or compatibility wrappers and use those local patterns unless you can explain why they do not fit. Validate from a reproducible workspace-root entrypoint before falling back to focused leaf commands; if a build or test cannot run, report the exact command, the exact blocker, and any narrower check you ran instead. During validation, also try one bounded independent reproduction of the collected failure signal when it is safe and cheap, such as a failing test, smoke command, perf/strace comparison, or before/after runtime check. Only use `reproduced` if that command or test actually reproduced the failure; otherwise keep `observed` and report the reproduction blocker. The final explanation must connect the observed issue evidence to the actual code change, not just paraphrase the diff. Write like a maintainer is going to read the patch mail cold: explain the bug in plain language, define subsystem-specific jargon the first time you need it, and make the causal story obvious. Explicitly classify evidence confidence as `reproduced`, `observed`, or `inferred`: `reproduced` means you reproduced the failure locally; `observed` means Fixer has direct crash/log/trace evidence but you did not independently reproduce it; `inferred` means the source patch is not pull-request-ready, so do not leave a source diff unless you first gather stronger observed/reproduced evidence; otherwise return a no-patch diagnosis/report. For any source-changing `observed` patch, say explicitly in `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. Security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior need reproduced evidence plus explicit security-impact analysis before leaving a source diff; otherwise return a no-patch diagnosis/report for human review. If you introduce non-obvious state translation, index remapping, or backend split logic, add a short source comment that explains the invariant being preserved.
Start by explaining the likely root cause from the collected perf, strace, and /proc evidence. If you cannot land a safe patch, leave a diagnosis that is strong enough for an upstream bug report.
Interpreter process expectation: when the hot process is Python, Perl, shell, Node, Ruby, PHP, Lua, or another interpreter, inspect both the runtime and the script/application entrypoint from `details.interpreter_process`. Prefer the script or application package when evidence points there; do not patch the interpreter runtime merely because the hot binary is `python`, `perl`, `bash`, or similar. Runtime fixes are welcome only after checking the entrypoint and explaining why the runtime mishandles the workload or why running bad code faster/safer is itself the right upstream fix.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Keep the change narrowly scoped and summarize validation clearly.
In every authoring pass, your final response must start with `Subject: <single-line git commit subject>` and then include these markdown sections exactly:
## Commit Message
A short upstream-friendly explanation of what changed and why. Write it in plain language that a maintainer can follow without local complaint context. If you use subsystem jargon, define it immediately.
## Evidence Confidence
Exactly one word: `reproduced`, `observed`, or `inferred`. Use `reproduced` only when you reproduced the failure locally with a command or test, and include that command/test in `## Validation`. Use `observed` when Fixer has direct crash/log/trace evidence but you did not independently reproduce it. If `## Git Add Paths` lists source files for an `observed` patch, `## Issue Connection` must explicitly say the failure was observed by Fixer and not independently reproduced. Security-sensitive source changes touching authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior require reproduced evidence and explicit security-impact analysis; otherwise list `None` under `## Git Add Paths` and write a no-patch diagnosis/report. Use `inferred` for profiler/strace/indirect evidence; inferred responses may be no-patch diagnoses or reports, but inferred source patches are not pull-request-ready until stronger evidence is gathered.
## Issue Connection
Write this as maintainer-facing patch mail, not as local Fixer notes. Cover four things explicitly in readable sentences: the user-visible symptom or the exact collected signal, the code-level cause or the cautious inference from evidence, the specific change you made, and the expected effect. Do not invent a reproducer, command line, crash, or user-visible failure that is not present in the evidence bundle. If the evidence is direct-but-not-reproduced, say it was observed by Fixer and not independently reproduced. If the evidence is indirect and you did not gather stronger evidence, do not leave a source diff; write a no-patch diagnosis/report instead. Include an explicit effect sentence such as `The expected effect is ...`, `This should reduce ...`, or `This prevents ...` for source patches. If the logic is non-obvious in code, mention that you added a short explanatory comment.
## Git Add Paths
List the repo-relative paths that belong in the final patch, one per line. Use `None` only when you intentionally made no source changes. Include intentionally new files, and do not list generated build artifacts.
## Validation
List the checks you ran, or say clearly that you could not run them. Include the independent reproduction command/test and result when `## Evidence Confidence` is `reproduced`; if reproduction was attempted but blocked, name the exact blocker and keep confidence at `observed` or `inferred`.
Before editing, read the plan at `./plan-output.txt` and follow it unless the code proves part of it wrong. If you change course, say so explicitly in the final write-up instead of silently drifting from the plan.
## Review Pass 1
You are reviewing a freshly generated fixer patch.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Review the first patch pass. The original pre-edit snapshot is available at `./source` for diffing.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout. The latest author response is at `./patch-output.txt`. Inspect the current code and changed paths like a strict code reviewer. Focus on correctness, regressions, maintainability, awkward control flow such as avoidable `goto`, missing validation, weak or non-gittable commit message text, and explanations that fail to connect the observed issue evidence to the code change. Also review the maintainer experience: the patch mail should be easy to accept upstream, the user-visible bug should be explained in plain language, subsystem-specific jargon should be defined when first used, and any non-obvious state translation or index remapping in code should have a short explanatory comment. Reject patches that omit `## Evidence Confidence`, use anything other than `reproduced`, `observed`, or `inferred`, or sound more certain than that evidence level allows. Reject patches that claim `reproduced` unless `## Validation` names the concrete reproduction command or test and its result. Reject source patches in security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior unless the author reproduced the behavior and explicitly analyzed the security impact of the change; observed-only evidence should become a diagnosis/report, not a PR-ready source diff. Reject patches that invent a reproducer, command line, crash, or user-visible failure not present in the evidence bundle; indirect profiler or strace evidence may justify a cautious mitigation, but the author must say it is indirect instead of presenting it as a confirmed upstream bug. Reject patches that introduce generic libc/std APIs when nearby code or project docs provide a local compat/helper API for the same job, unless the author explicitly justifies the exception. Reject validation that only reports a leaf object/syntax build when a project-level configure/build/test entrypoint exists and was not attempted; if a full build cannot run, the author must show the exact failed command and blocker.
Do not apply code changes in this pass.
Return a short markdown review report. The first non-empty line must be exactly one of:
RESULT: ok
RESULT: fix-needed
If you choose `RESULT: fix-needed`, add a `## Findings` section with concrete, actionable items.## Plan Pass
## Problem
Fixer observed `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` in `select`/`pselect6`, but the retained syscall evidence shows blocking waits of about 1.8s and 2.0s, process state `S (sleeping)`, and only 0.9% CPU. That matches Net::Server::Fork’s normal parent accept loop, which calls `can_read(2)`, more than a proven munin busy-poll bug.
## Evidence Confidence
observed
## Proposed Subject
No upstream source patch yet: diagnose this as insufficient/contradictory evidence for a munin code change.
## Patch Plan
Do not edit munin source in this pass. The evidence is profiler-only at the Perl/native boundary and lacks a Perl-level stack tying the loop to `script/munin-node`, `Munin::Node::Server`, or plugin execution.
If later evidence shows a real tight loop, investigate `lib/Munin/Node/Server.pm` first, then `lib/Munin/Node/OS.pm`, following `HACKING.pod` conventions: taint-safe Perl, `strict`/`warnings`, `English`, existing logging via `Munin::Common::Logger`, and bounded work via `Munin::Common::Timeout::do_with_timeout`. No relevant local helper was found for replacing Net::Server’s accept-loop `select`; Net::Server owns that logic.
No prior Fixer patch is present to improve or replace. Avoid adding awkward control flow such as `goto`; any future mitigation should be a small bounded conditional or timeout/config handling change with a direct reproducer.
## Risks
Patching now would likely change normal daemon idle behavior based on a false positive. The observed 2-second `pselect6` timeout is consistent with Net::Server::Fork, and changing it could affect signal handling, connection acceptance latency, or child reaping without addressing a demonstrated bug.
## Validation
For any later patch, first run project-level validation from the workspace root: `make`, then `make test`. There is no `make check` target in the inspected `Makefile`.
Bounded independent reproduction before editing: after `make`, start `munin-node` from the built tree with a temporary config/plugin directory under `timeout`, attach `strace -ttT -e trace=pselect6,select,poll,ppoll`, and verify whether waits are genuinely near-zero busy polling or normal ~2s idle accepts. Do not claim reproduced unless that command shows the tight-loop failure.
## Patch Pass
Subject: Diagnose munin-node idle select evidence
## Commit Message
No source change. The collected evidence points to `munin-node` idling in Net::Server::Fork’s accept loop, not to a proven busy poll in Munin or Perl. Net::Server::Fork uses `IO::Select->can_read(2)`, a two-second blocking wait for incoming sockets, and the retained `/proc` and `strace` data match that shape.
## Evidence Confidence
inferred
## Issue Connection
Fixer collected a Perl process running `/usr/sbin/munin-node --foreground` with native frames under `select`, repeated `pselect6`, process state `S (sleeping)`, `wchan` at `poll_schedule_timeout`, and only 0.9% CPU. The likely root cause is a heuristic mismatch: the process was sampled while sleeping in the daemon’s accept loop, and the retained `strace` entries show blocking waits of about 1.8s and 2.0s rather than a tight zero-timeout loop.
I inspected the script entrypoint `script/munin-node`, the node server implementation in `lib/Munin/Node/Server.pm`, and the runtime library path used by the server. `Munin::Node::Server` inherits Net::Server::Fork, and the relevant accept wait is in Net::Server::Fork’s `can_read(2)` call, not in Munin request processing. Munin’s local conventions from `CONTRIBUTING.md` and `HACKING.pod` are taint-safe Perl with `strict`/`warnings`, `English`, logging through `Munin::Common::Logger`, and bounded work through `Munin::Common::Timeout::do_with_timeout`; no relevant local helper was found for replacing Net::Server’s accept-loop wait.
I made no source change because the evidence is indirect and contradictory for a source patch. The expected effect is to avoid an upstream patch that would alter normal idle daemon behavior without a reproduced busy-poll failure.
## Git Add Paths
None
## Validation
`make` from the workspace root failed before building: `Can't locate Module/Build.pm in @INC ... at Build.PL line 80`, followed by `make: *** [Makefile:149: Build] Error 2`.
`make -n check` failed because this tree has no `check` target: `make: *** No rule to make target 'check'. Stop.`
Focused check run: `perl -c lib/Munin/Node/Server.pm` passed with `syntax OK`.
Independent reproduction attempt: `timeout 6s strace -ttT -e trace=pselect6,select,poll,ppoll perl -MNet::Server::Fork ...` was blocked by sandbox ptrace restrictions: `PTRACE_TRACEME: Operation not permitted`. As a fallback, `/usr/bin/time ... perl -MIO::Select ... can_read(2)` completed three waits in `elapsed=6.00 cpu=0%`, which did not reproduce a busy poll and matches the collected multi-second `pselect6` waits.
## Review Pass 1
RESULT: ok
No source diff is present, and that is appropriate for the evidence level. The report keeps confidence at `inferred`, does not claim reproduction, explains the likely Net::Server::Fork idle `can_read(2)` path, names the Munin style/helper conventions checked, and reports the project-level validation blockers with exact failures.perl likely remains stuck in a busy-poll loop. A diagnosis report and patch proposal were created locally.
## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.
## Patch Pass
You are working on a bounded fixer proposal.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Produce the smallest reasonable patch for the target repository, keep the change upstreamable, prefer the clearest control flow available, and do not keep avoidable `goto` when a simpler structure would read better. Before introducing new file, process, allocation, locking, networking, or platform APIs, inspect nearby code and project contribution docs for existing helpers or compatibility wrappers and use those local patterns unless you can explain why they do not fit. Validate from a reproducible workspace-root entrypoint before falling back to focused leaf commands; if a build or test cannot run, report the exact command, the exact blocker, and any narrower check you ran instead. During validation, also try one bounded independent reproduction of the collected failure signal when it is safe and cheap, such as a failing test, smoke command, perf/strace comparison, or before/after runtime check. Only use `reproduced` if that command or test actually reproduced the failure; otherwise keep `observed` and report the reproduction blocker. The final explanation must connect the observed issue evidence to the actual code change, not just paraphrase the diff. Write like a maintainer is going to read the patch mail cold: explain the bug in plain language, define subsystem-specific jargon the first time you need it, and make the causal story obvious. Explicitly classify evidence confidence as `reproduced`, `observed`, or `inferred`: `reproduced` means you reproduced the failure locally; `observed` means Fixer has direct crash/log/trace evidence but you did not independently reproduce it; `inferred` means the source patch is not pull-request-ready, so do not leave a source diff unless you first gather stronger observed/reproduced evidence; otherwise return a no-patch diagnosis/report. For any source-changing `observed` patch, say explicitly in `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. Security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior need reproduced evidence plus explicit security-impact analysis before leaving a source diff; otherwise return a no-patch diagnosis/report for human review. If you introduce non-obvious state translation, index remapping, or backend split logic, add a short source comment that explains the invariant being preserved.
Start by explaining the likely root cause from the collected perf, strace, and /proc evidence. If you cannot land a safe patch, leave a diagnosis that is strong enough for an upstream bug report.
Interpreter process expectation: when the hot process is Python, Perl, shell, Node, Ruby, PHP, Lua, or another interpreter, inspect both the runtime and the script/application entrypoint from `details.interpreter_process`. Prefer the script or application package when evidence points there; do not patch the interpreter runtime merely because the hot binary is `python`, `perl`, `bash`, or similar. Runtime fixes are welcome only after checking the entrypoint and explaining why the runtime mishandles the workload or why running bad code faster/safer is itself the right upstream fix.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Keep the change narrowly scoped and summarize validation clearly.
In every authoring pass, your final response must start with `Subject: <single-line git commit subject>` and then include these markdown sections exactly:
## Commit Message
A short upstream-friendly explanation of what changed and why. Write it in plain language that a maintainer can follow without local complaint context. If you use subsystem jargon, define it immediately.
## Evidence Confidence
Exactly one word: `reproduced`, `observed`, or `inferred`. Use `reproduced` only when you reproduced the failure locally with a command or test, and include that command/test in `## Validation`. Use `observed` when Fixer has direct crash/log/trace evidence but you did not independently reproduce it. If `## Git Add Paths` lists source files for an `observed` patch, `## Issue Connection` must explicitly say the failure was observed by Fixer and not independently reproduced. Security-sensitive source changes touching authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior require reproduced evidence and explicit security-impact analysis; otherwise list `None` under `## Git Add Paths` and write a no-patch diagnosis/report. Use `inferred` for profiler/strace/indirect evidence; inferred responses may be no-patch diagnoses or reports, but inferred source patches are not pull-request-ready until stronger evidence is gathered.
## Issue Connection
Write this as maintainer-facing patch mail, not as local Fixer notes. Cover four things explicitly in readable sentences: the user-visible symptom or the exact collected signal, the code-level cause or the cautious inference from evidence, the specific change you made, and the expected effect. Do not invent a reproducer, command line, crash, or user-visible failure that is not present in the evidence bundle. If the evidence is direct-but-not-reproduced, say it was observed by Fixer and not independently reproduced. If the evidence is indirect and you did not gather stronger evidence, do not leave a source diff; write a no-patch diagnosis/report instead. Include an explicit effect sentence such as `The expected effect is ...`, `This should reduce ...`, or `This prevents ...` for source patches. If the logic is non-obvious in code, mention that you added a short explanatory comment.
## Git Add Paths
List the repo-relative paths that belong in the final patch, one per line. Use `None` only when you intentionally made no source changes. Include intentionally new files, and do not list generated build artifacts.
## Validation
List the checks you ran, or say clearly that you could not run them. Include the independent reproduction command/test and result when `## Evidence Confidence` is `reproduced`; if reproduction was attempted but blocked, name the exact blocker and keep confidence at `observed` or `inferred`.
Before editing, read the plan at `./plan-output.txt` and follow it unless the code proves part of it wrong. If you change course, say so explicitly in the final write-up instead of silently drifting from the plan.
## Review Pass 1
You are reviewing a freshly generated fixer patch.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Review the first patch pass. The original pre-edit snapshot is available at `./source` for diffing.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout. The latest author response is at `./patch-output.txt`. Inspect the current code and changed paths like a strict code reviewer. Focus on correctness, regressions, maintainability, awkward control flow such as avoidable `goto`, missing validation, weak or non-gittable commit message text, and explanations that fail to connect the observed issue evidence to the code change. Also review the maintainer experience: the patch mail should be easy to accept upstream, the user-visible bug should be explained in plain language, subsystem-specific jargon should be defined when first used, and any non-obvious state translation or index remapping in code should have a short explanatory comment. Reject patches that omit `## Evidence Confidence`, use anything other than `reproduced`, `observed`, or `inferred`, or sound more certain than that evidence level allows. Reject patches that claim `reproduced` unless `## Validation` names the concrete reproduction command or test and its result. Reject source patches in security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior unless the author reproduced the behavior and explicitly analyzed the security impact of the change; observed-only evidence should become a diagnosis/report, not a PR-ready source diff. Reject patches that invent a reproducer, command line, crash, or user-visible failure not present in the evidence bundle; indirect profiler or strace evidence may justify a cautious mitigation, but the author must say it is indirect instead of presenting it as a confirmed upstream bug. Reject patches that introduce generic libc/std APIs when nearby code or project docs provide a local compat/helper API for the same job, unless the author explicitly justifies the exception. Reject validation that only reports a leaf object/syntax build when a project-level configure/build/test entrypoint exists and was not attempted; if a full build cannot run, the author must show the exact failed command and blocker.
Do not apply code changes in this pass.
Return a short markdown review report. The first non-empty line must be exactly one of:
RESULT: ok
RESULT: fix-needed
If you choose `RESULT: fix-needed`, add a `## Findings` section with concrete, actionable items.## Plan Pass
## Problem
Fixer observed `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` in a poll-family loop, but the retained evidence does not show an application-level tight loop. The JSON excerpt shows `pselect6` calls blocking for about 1.8-2.0 seconds, `State: S (sleeping)`, `wchan: poll_schedule_timeout...`, and only `0.9%` CPU. That looks consistent with an idle Net::Server/Perl daemon wait, not a proven runaway `munin-node` bug.
## Evidence Confidence
inferred
## Proposed Subject
No source patch yet: diagnose munin-node idle `pselect6` evidence before changing timing/timeout behavior.
## Patch Plan
- Do not edit files in this pass. A source patch is blocked because the evidence is profiler-only/indirect and the only retained syscall samples show blocking `pselect6`, not busy polling.
- Entry point inspection starts at `script/munin-node`, then `lib/Munin/Node/Server.pm`; runtime Perl remains secondary unless a reproducer proves Perl mishandles the workload.
- If later evidence proves a real node-side spin, patch the bounded subsystem using existing conventions: `Munin::Common::Timeout::do_with_timeout` for transaction/plugin limits and `Munin::Common::Logger` for diagnostics. Avoid awkward control flow such as avoidable `goto`; keep any loop change local to `Munin::Node::Server` or `Munin::Node::OS`.
- Follow maintainer docs: `CONTRIBUTING.md` points to `HACKING.pod`; new Perl should use `strict`, `warnings`, clear `English` variables where appropriate, one statement per line, and file-local indentation style.
- No prior Fixer patch was found in this workspace to improve or replace.
- Because any real fix would likely alter timing/timeout behavior, treat it as security-sensitive per the instructions; do not patch without a reproduced behavior and security impact check.
## Risks
- Adding sleeps, changing Net::Server accept behavior, or shortening `global_timeout` without reproduction could regress normal munin-node responsiveness.
- The raw artifact paths named in `evidence.json` are not available in this workspace, so the current diagnosis depends on JSON excerpts only.
- A plugin or deployment-specific master connection pattern could still trigger a real loop, but that is not established by the retained evidence.
## Validation
- First try project-level validation from the workspace root: `make`, then `make check` only if that target exists; if dependencies/generated files are missing, record the exact failure and then run the narrowest relevant Perl compile/test.
- Bounded independent reproduction attempt before any future source patch: run `munin-node` foreground with a minimal temporary config and no enabled plugins, attach a short `strace -ttT -e trace=pselect6,select,poll,ppoll`, and verify whether waits return immediately or block around the expected Net::Server timeout.
- Focused checks if a patch later becomes justified: `perl -c script/munin-node`, `perl -c lib/Munin/Node/Server.pm`, and the relevant `./Build test --test_files ...` node tests after `make`/`./Build` setup.
## Patch Pass
Subject: Diagnose munin-node pselect profile without patch
## Commit Message
Likely root cause: the collected perf label says “busy-poll”, but the retained `strace` and `/proc` evidence points to normal idle waiting. The sampled process was sleeping in the kernel poll timeout path, and the captured `pselect6` calls blocked for about two seconds each.
No source patch is left here. Changing `munin-node` wait, timeout, or throttling behavior from this evidence would be speculative and timing-sensitive.
## Evidence Confidence
inferred
## Issue Connection
The collected signal is `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` repeatedly appearing under `pselect6`, with native Perl frames in the backtrace. The same evidence also shows `State: S (sleeping)`, `wchan: poll_schedule_timeout...`, `0.9%` CPU, and `pselect6` calls returning after about 1.8-2.0 seconds, which does not establish a tight CPU loop.
Code inspection found that `script/munin-node` runs `Munin::Node::Server`, which subclasses `Net::Server::Fork`; the idle accept/wait behavior is delegated to Net::Server. Request and plugin execution are already bounded through the local `Munin::Common::Timeout::do_with_timeout` helper, and diagnostics use `Munin::Common::Logger`. I did not find a safe local code-level cause in `munin-node`, and I did not find evidence that the Perl runtime mishandles this workload.
The specific change made is none: this follows the saved plan and leaves a no-patch diagnosis instead of changing daemon timing behavior without reproduced evidence or security-impact analysis. The expected effect is no behavioral change in Munin, while preserving a clear upstream report basis: the current evidence is consistent with an idle daemon wait, not a confirmed runaway process.
## Git Add Paths
None
## Validation
`make` from the workspace root failed before building because `Module::Build` is missing:
`Can't locate Module/Build.pm in @INC ... at Build.PL line 80.`
`make check` failed because this tree has no `check` target:
`make: *** No rule to make target 'check'. Stop.`
Focused checks run after the project-level blocker:
`perl -Ilib -c lib/Munin/Node/Server.pm` passed.
`perl -T -Ilib -c script/munin-node` passed.
Independent reproduction attempt:
`timeout 6s strace -ttT -f -e trace=pselect6,select,poll,ppoll,epoll_wait,nanosleep,clock_nanosleep ... munin-node --foreground ...` was blocked by sandbox ptrace restrictions:
`PTRACE_TRACEME: Operation not permitted` and `ptrace(PTRACE_SEIZE, 9): Operation not permitted`.
A non-strace foreground smoke attempt with an empty plugin directory was also blocked by the sandbox before it could exercise the idle loop:
`Cannot bind and listen to TCP port 14950 on 127.0.0.1 [Operation not permitted]`.
No independent local reproduction of a busy poll was obtained, so confidence remains `inferred` and no source diff is left.
## Review Pass 1
RESULT: ok
No source diff is present, and the no-patch diagnosis is consistent with the evidence level. The author used `inferred`, did not claim reproduction, did not leave a timing-sensitive source change without reproduced evidence, and attempted the required project-level validation before focused syntax checks. The response also names the relevant local helpers (`Munin::Common::Timeout`, `Munin::Common::Logger`) and explains why the retained `pselect6` samples look like blocking idle wait rather than a confirmed busy loop.perl likely remains stuck in a busy-poll loop. A diagnosis report and patch proposal were created locally.
## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.
## Patch Pass
You are working on a bounded fixer proposal.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Produce the smallest reasonable patch for the target repository, keep the change upstreamable, prefer the clearest control flow available, and do not keep avoidable `goto` when a simpler structure would read better. Before introducing new file, process, allocation, locking, networking, or platform APIs, inspect nearby code and project contribution docs for existing helpers or compatibility wrappers and use those local patterns unless you can explain why they do not fit. Validate from a reproducible workspace-root entrypoint before falling back to focused leaf commands; if a build or test cannot run, report the exact command, the exact blocker, and any narrower check you ran instead. During validation, also try one bounded independent reproduction of the collected failure signal when it is safe and cheap, such as a failing test, smoke command, perf/strace comparison, or before/after runtime check. Only use `reproduced` if that command or test actually reproduced the failure; otherwise keep `observed` and report the reproduction blocker. The final explanation must connect the observed issue evidence to the actual code change, not just paraphrase the diff. Write like a maintainer is going to read the patch mail cold: explain the bug in plain language, define subsystem-specific jargon the first time you need it, and make the causal story obvious. Explicitly classify evidence confidence as `reproduced`, `observed`, or `inferred`: `reproduced` means you reproduced the failure locally; `observed` means Fixer has direct crash/log/trace evidence but you did not independently reproduce it; `inferred` means the source patch is not pull-request-ready, so do not leave a source diff unless you first gather stronger observed/reproduced evidence; otherwise return a no-patch diagnosis/report. For any source-changing `observed` patch, say explicitly in `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. Security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior need reproduced evidence plus explicit security-impact analysis before leaving a source diff; otherwise return a no-patch diagnosis/report for human review. If you introduce non-obvious state translation, index remapping, or backend split logic, add a short source comment that explains the invariant being preserved.
Start by explaining the likely root cause from the collected perf, strace, and /proc evidence. If you cannot land a safe patch, leave a diagnosis that is strong enough for an upstream bug report.
Interpreter process expectation: when the hot process is Python, Perl, shell, Node, Ruby, PHP, Lua, or another interpreter, inspect both the runtime and the script/application entrypoint from `details.interpreter_process`. Prefer the script or application package when evidence points there; do not patch the interpreter runtime merely because the hot binary is `python`, `perl`, `bash`, or similar. Runtime fixes are welcome only after checking the entrypoint and explaining why the runtime mishandles the workload or why running bad code faster/safer is itself the right upstream fix.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Keep the change narrowly scoped and summarize validation clearly.
In every authoring pass, your final response must start with `Subject: <single-line git commit subject>` and then include these markdown sections exactly:
## Commit Message
A short upstream-friendly explanation of what changed and why. Write it in plain language that a maintainer can follow without local complaint context. If you use subsystem jargon, define it immediately.
## Evidence Confidence
Exactly one word: `reproduced`, `observed`, or `inferred`. Use `reproduced` only when you reproduced the failure locally with a command or test, and include that command/test in `## Validation`. Use `observed` when Fixer has direct crash/log/trace evidence but you did not independently reproduce it. If `## Git Add Paths` lists source files for an `observed` patch, `## Issue Connection` must explicitly say the failure was observed by Fixer and not independently reproduced. Security-sensitive source changes touching authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior require reproduced evidence and explicit security-impact analysis; otherwise list `None` under `## Git Add Paths` and write a no-patch diagnosis/report. Use `inferred` for profiler/strace/indirect evidence; inferred responses may be no-patch diagnoses or reports, but inferred source patches are not pull-request-ready until stronger evidence is gathered.
## Issue Connection
Write this as maintainer-facing patch mail, not as local Fixer notes. Cover four things explicitly in readable sentences: the user-visible symptom or the exact collected signal, the code-level cause or the cautious inference from evidence, the specific change you made, and the expected effect. Do not invent a reproducer, command line, crash, or user-visible failure that is not present in the evidence bundle. If the evidence is direct-but-not-reproduced, say it was observed by Fixer and not independently reproduced. If the evidence is indirect and you did not gather stronger evidence, do not leave a source diff; write a no-patch diagnosis/report instead. Include an explicit effect sentence such as `The expected effect is ...`, `This should reduce ...`, or `This prevents ...` for source patches. If the logic is non-obvious in code, mention that you added a short explanatory comment.
## Git Add Paths
List the repo-relative paths that belong in the final patch, one per line. Use `None` only when you intentionally made no source changes. Include intentionally new files, and do not list generated build artifacts.
## Validation
List the checks you ran, or say clearly that you could not run them. Include the independent reproduction command/test and result when `## Evidence Confidence` is `reproduced`; if reproduction was attempted but blocked, name the exact blocker and keep confidence at `observed` or `inferred`.
Before editing, read the plan at `./plan-output.txt` and follow it unless the code proves part of it wrong. If you change course, say so explicitly in the final write-up instead of silently drifting from the plan.
## Review Pass 1
You are reviewing a freshly generated fixer patch.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Review the first patch pass. The original pre-edit snapshot is available at `./source` for diffing.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout. The latest author response is at `./patch-output.txt`. Inspect the current code and changed paths like a strict code reviewer. Focus on correctness, regressions, maintainability, awkward control flow such as avoidable `goto`, missing validation, weak or non-gittable commit message text, and explanations that fail to connect the observed issue evidence to the code change. Also review the maintainer experience: the patch mail should be easy to accept upstream, the user-visible bug should be explained in plain language, subsystem-specific jargon should be defined when first used, and any non-obvious state translation or index remapping in code should have a short explanatory comment. Reject patches that omit `## Evidence Confidence`, use anything other than `reproduced`, `observed`, or `inferred`, or sound more certain than that evidence level allows. Reject patches that claim `reproduced` unless `## Validation` names the concrete reproduction command or test and its result. Reject source patches in security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior unless the author reproduced the behavior and explicitly analyzed the security impact of the change; observed-only evidence should become a diagnosis/report, not a PR-ready source diff. Reject patches that invent a reproducer, command line, crash, or user-visible failure not present in the evidence bundle; indirect profiler or strace evidence may justify a cautious mitigation, but the author must say it is indirect instead of presenting it as a confirmed upstream bug. Reject patches that introduce generic libc/std APIs when nearby code or project docs provide a local compat/helper API for the same job, unless the author explicitly justifies the exception. Reject validation that only reports a leaf object/syntax build when a project-level configure/build/test entrypoint exists and was not attempted; if a full build cannot run, the author must show the exact failed command and blocker.
Do not apply code changes in this pass.
Return a short markdown review report. The first non-empty line must be exactly one of:
RESULT: ok
RESULT: fix-needed
If you choose `RESULT: fix-needed`, add a `## Findings` section with concrete, actionable items.## Plan Pass
## Problem
Fixer observed `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` in a poll-family loop, but the retained evidence does not show an application-level tight loop. The JSON excerpt shows `pselect6` calls blocking for about 1.8-2.0 seconds, `State: S (sleeping)`, `wchan: poll_schedule_timeout...`, and only `0.9%` CPU. That looks consistent with an idle Net::Server/Perl daemon wait, not a proven runaway `munin-node` bug.
## Evidence Confidence
inferred
## Proposed Subject
No source patch yet: diagnose munin-node idle `pselect6` evidence before changing timing/timeout behavior.
## Patch Plan
- Do not edit files in this pass. A source patch is blocked because the evidence is profiler-only/indirect and the only retained syscall samples show blocking `pselect6`, not busy polling.
- Entry point inspection starts at `script/munin-node`, then `lib/Munin/Node/Server.pm`; runtime Perl remains secondary unless a reproducer proves Perl mishandles the workload.
- If later evidence proves a real node-side spin, patch the bounded subsystem using existing conventions: `Munin::Common::Timeout::do_with_timeout` for transaction/plugin limits and `Munin::Common::Logger` for diagnostics. Avoid awkward control flow such as avoidable `goto`; keep any loop change local to `Munin::Node::Server` or `Munin::Node::OS`.
- Follow maintainer docs: `CONTRIBUTING.md` points to `HACKING.pod`; new Perl should use `strict`, `warnings`, clear `English` variables where appropriate, one statement per line, and file-local indentation style.
- No prior Fixer patch was found in this workspace to improve or replace.
- Because any real fix would likely alter timing/timeout behavior, treat it as security-sensitive per the instructions; do not patch without a reproduced behavior and security impact check.
## Risks
- Adding sleeps, changing Net::Server accept behavior, or shortening `global_timeout` without reproduction could regress normal munin-node responsiveness.
- The raw artifact paths named in `evidence.json` are not available in this workspace, so the current diagnosis depends on JSON excerpts only.
- A plugin or deployment-specific master connection pattern could still trigger a real loop, but that is not established by the retained evidence.
## Validation
- First try project-level validation from the workspace root: `make`, then `make check` only if that target exists; if dependencies/generated files are missing, record the exact failure and then run the narrowest relevant Perl compile/test.
- Bounded independent reproduction attempt before any future source patch: run `munin-node` foreground with a minimal temporary config and no enabled plugins, attach a short `strace -ttT -e trace=pselect6,select,poll,ppoll`, and verify whether waits return immediately or block around the expected Net::Server timeout.
- Focused checks if a patch later becomes justified: `perl -c script/munin-node`, `perl -c lib/Munin/Node/Server.pm`, and the relevant `./Build test --test_files ...` node tests after `make`/`./Build` setup.
## Patch Pass
Subject: Diagnose munin-node pselect profile without patch
## Commit Message
Likely root cause: the collected perf label says “busy-poll”, but the retained `strace` and `/proc` evidence points to normal idle waiting. The sampled process was sleeping in the kernel poll timeout path, and the captured `pselect6` calls blocked for about two seconds each.
No source patch is left here. Changing `munin-node` wait, timeout, or throttling behavior from this evidence would be speculative and timing-sensitive.
## Evidence Confidence
inferred
## Issue Connection
The collected signal is `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` repeatedly appearing under `pselect6`, with native Perl frames in the backtrace. The same evidence also shows `State: S (sleeping)`, `wchan: poll_schedule_timeout...`, `0.9%` CPU, and `pselect6` calls returning after about 1.8-2.0 seconds, which does not establish a tight CPU loop.
Code inspection found that `script/munin-node` runs `Munin::Node::Server`, which subclasses `Net::Server::Fork`; the idle accept/wait behavior is delegated to Net::Server. Request and plugin execution are already bounded through the local `Munin::Common::Timeout::do_with_timeout` helper, and diagnostics use `Munin::Common::Logger`. I did not find a safe local code-level cause in `munin-node`, and I did not find evidence that the Perl runtime mishandles this workload.
The specific change made is none: this follows the saved plan and leaves a no-patch diagnosis instead of changing daemon timing behavior without reproduced evidence or security-impact analysis. The expected effect is no behavioral change in Munin, while preserving a clear upstream report basis: the current evidence is consistent with an idle daemon wait, not a confirmed runaway process.
## Git Add Paths
None
## Validation
`make` from the workspace root failed before building because `Module::Build` is missing:
`Can't locate Module/Build.pm in @INC ... at Build.PL line 80.`
`make check` failed because this tree has no `check` target:
`make: *** No rule to make target 'check'. Stop.`
Focused checks run after the project-level blocker:
`perl -Ilib -c lib/Munin/Node/Server.pm` passed.
`perl -T -Ilib -c script/munin-node` passed.
Independent reproduction attempt:
`timeout 6s strace -ttT -f -e trace=pselect6,select,poll,ppoll,epoll_wait,nanosleep,clock_nanosleep ... munin-node --foreground ...` was blocked by sandbox ptrace restrictions:
`PTRACE_TRACEME: Operation not permitted` and `ptrace(PTRACE_SEIZE, 9): Operation not permitted`.
A non-strace foreground smoke attempt with an empty plugin directory was also blocked by the sandbox before it could exercise the idle loop:
`Cannot bind and listen to TCP port 14950 on 127.0.0.1 [Operation not permitted]`.
No independent local reproduction of a busy poll was obtained, so confidence remains `inferred` and no source diff is left.
## Review Pass 1
RESULT: ok
No source diff is present, and the no-patch diagnosis is consistent with the evidence level. The author used `inferred`, did not claim reproduction, did not leave a timing-sensitive source change without reproduced evidence, and attempted the required project-level validation before focused syntax checks. The response also names the relevant local helpers (`Munin::Common::Timeout`, `Munin::Common::Logger`) and explains why the retained `pselect6` samples look like blocking idle wait rather than a confirmed busy loop.perl likely remains stuck in a busy-poll loop. A diagnosis report and patch proposal were created locally.
## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.
## Patch Pass
You are working on a bounded fixer proposal.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Produce the smallest reasonable patch for the target repository, keep the change upstreamable, prefer the clearest control flow available, and do not keep avoidable `goto` when a simpler structure would read better. Before introducing new file, process, allocation, locking, networking, or platform APIs, inspect nearby code and project contribution docs for existing helpers or compatibility wrappers and use those local patterns unless you can explain why they do not fit. Validate from a reproducible workspace-root entrypoint before falling back to focused leaf commands; if a build or test cannot run, report the exact command, the exact blocker, and any narrower check you ran instead. During validation, also try one bounded independent reproduction of the collected failure signal when it is safe and cheap, such as a failing test, smoke command, perf/strace comparison, or before/after runtime check. Only use `reproduced` if that command or test actually reproduced the failure; otherwise keep `observed` and report the reproduction blocker. The final explanation must connect the observed issue evidence to the actual code change, not just paraphrase the diff. Write like a maintainer is going to read the patch mail cold: explain the bug in plain language, define subsystem-specific jargon the first time you need it, and make the causal story obvious. Explicitly classify evidence confidence as `reproduced`, `observed`, or `inferred`: `reproduced` means you reproduced the failure locally; `observed` means Fixer has direct crash/log/trace evidence but you did not independently reproduce it; `inferred` means the source patch is not pull-request-ready, so do not leave a source diff unless you first gather stronger observed/reproduced evidence; otherwise return a no-patch diagnosis/report. For any source-changing `observed` patch, say explicitly in `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. Security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior need reproduced evidence plus explicit security-impact analysis before leaving a source diff; otherwise return a no-patch diagnosis/report for human review. If you introduce non-obvious state translation, index remapping, or backend split logic, add a short source comment that explains the invariant being preserved.
Start by explaining the likely root cause from the collected perf, strace, and /proc evidence. If you cannot land a safe patch, leave a diagnosis that is strong enough for an upstream bug report.
Interpreter process expectation: when the hot process is Python, Perl, shell, Node, Ruby, PHP, Lua, or another interpreter, inspect both the runtime and the script/application entrypoint from `details.interpreter_process`. Prefer the script or application package when evidence points there; do not patch the interpreter runtime merely because the hot binary is `python`, `perl`, `bash`, or similar. Runtime fixes are welcome only after checking the entrypoint and explaining why the runtime mishandles the workload or why running bad code faster/safer is itself the right upstream fix.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Keep the change narrowly scoped and summarize validation clearly.
In every authoring pass, your final response must start with `Subject: <single-line git commit subject>` and then include these markdown sections exactly:
## Commit Message
A short upstream-friendly explanation of what changed and why. Write it in plain language that a maintainer can follow without local complaint context. If you use subsystem jargon, define it immediately.
## Evidence Confidence
Exactly one word: `reproduced`, `observed`, or `inferred`. Use `reproduced` only when you reproduced the failure locally with a command or test, and include that command/test in `## Validation`. Use `observed` when Fixer has direct crash/log/trace evidence but you did not independently reproduce it. If `## Git Add Paths` lists source files for an `observed` patch, `## Issue Connection` must explicitly say the failure was observed by Fixer and not independently reproduced. Security-sensitive source changes touching authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior require reproduced evidence and explicit security-impact analysis; otherwise list `None` under `## Git Add Paths` and write a no-patch diagnosis/report. Use `inferred` for profiler/strace/indirect evidence; inferred responses may be no-patch diagnoses or reports, but inferred source patches are not pull-request-ready until stronger evidence is gathered.
## Issue Connection
Write this as maintainer-facing patch mail, not as local Fixer notes. Cover four things explicitly in readable sentences: the user-visible symptom or the exact collected signal, the code-level cause or the cautious inference from evidence, the specific change you made, and the expected effect. Do not invent a reproducer, command line, crash, or user-visible failure that is not present in the evidence bundle. If the evidence is direct-but-not-reproduced, say it was observed by Fixer and not independently reproduced. If the evidence is indirect and you did not gather stronger evidence, do not leave a source diff; write a no-patch diagnosis/report instead. Include an explicit effect sentence such as `The expected effect is ...`, `This should reduce ...`, or `This prevents ...` for source patches. If the logic is non-obvious in code, mention that you added a short explanatory comment.
## Git Add Paths
List the repo-relative paths that belong in the final patch, one per line. Use `None` only when you intentionally made no source changes. Include intentionally new files, and do not list generated build artifacts.
## Validation
List the checks you ran, or say clearly that you could not run them. Include the independent reproduction command/test and result when `## Evidence Confidence` is `reproduced`; if reproduction was attempted but blocked, name the exact blocker and keep confidence at `observed` or `inferred`.
Before editing, read the plan at `./plan-output.txt` and follow it unless the code proves part of it wrong. If you change course, say so explicitly in the final write-up instead of silently drifting from the plan.
## Review Pass 1
You are reviewing a freshly generated fixer patch.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Review the first patch pass. The original pre-edit snapshot is available at `./source` for diffing.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout. The latest author response is at `./patch-output.txt`. Inspect the current code and changed paths like a strict code reviewer. Focus on correctness, regressions, maintainability, awkward control flow such as avoidable `goto`, missing validation, weak or non-gittable commit message text, and explanations that fail to connect the observed issue evidence to the code change. Also review the maintainer experience: the patch mail should be easy to accept upstream, the user-visible bug should be explained in plain language, subsystem-specific jargon should be defined when first used, and any non-obvious state translation or index remapping in code should have a short explanatory comment. Reject patches that omit `## Evidence Confidence`, use anything other than `reproduced`, `observed`, or `inferred`, or sound more certain than that evidence level allows. Reject patches that claim `reproduced` unless `## Validation` names the concrete reproduction command or test and its result. Reject source patches in security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior unless the author reproduced the behavior and explicitly analyzed the security impact of the change; observed-only evidence should become a diagnosis/report, not a PR-ready source diff. Reject patches that invent a reproducer, command line, crash, or user-visible failure not present in the evidence bundle; indirect profiler or strace evidence may justify a cautious mitigation, but the author must say it is indirect instead of presenting it as a confirmed upstream bug. Reject patches that introduce generic libc/std APIs when nearby code or project docs provide a local compat/helper API for the same job, unless the author explicitly justifies the exception. Reject validation that only reports a leaf object/syntax build when a project-level configure/build/test entrypoint exists and was not attempted; if a full build cannot run, the author must show the exact failed command and blocker.
Do not apply code changes in this pass.
Return a short markdown review report. The first non-empty line must be exactly one of:
RESULT: ok
RESULT: fix-needed
If you choose `RESULT: fix-needed`, add a `## Findings` section with concrete, actionable items.## Plan Pass
## Problem
Fixer observed `/usr/sbin/munin-node --foreground` under Perl in repeated `pselect6`, but the retained signal does not prove a Munin busy loop. The process was sleeping, sampled at only `0.9%` CPU, and `strace` showed blocking `pselect6` calls lasting about `1.8s` and `2.0s`, which is consistent with normal waiting rather than runaway CPU.
## Evidence Confidence
observed
## Proposed Subject
No source patch yet: diagnose the opportunity as non-actionable with current evidence, unless a follow-up capture shows a real tight loop tied to Munin application code.
## Patch Plan
Do not edit Munin for this evidence bundle as-is. The likely code path is `script/munin-node` -> `Munin::Node::Server` -> plugin execution via `Munin::Node::Service::fork_service` -> `Munin::Node::OS::run_as_child`, where `_read_from_child` uses Perl `select` under the existing `Munin::Common::Timeout::do_with_timeout` helper.
If later evidence shows repeated immediate `select` returns or CPU burn in `_read_from_child`, patch that bounded loop directly in `lib/Munin/Node/OS.pm`, following local style from `HACKING.pod`: `use strict`, `use warnings`, `English`, one statement per line, no avoidable `goto`, and reuse `do_with_timeout` rather than adding a competing timeout mechanism.
No relevant prior Fixer patch was found. Existing Debian patches are unrelated to `munin-node` polling or child-output collection.
## Risks
Changing this path without stronger evidence could alter plugin timeout, child reaping, or stdout/stderr collection behavior. TLS/auth paths are nearby in `Munin::Node::Server`, but this plan does not touch authentication, authorization, credentials, cryptography, sandboxing, permissions, or throttling behavior.
## Validation
Tried project-level entrypoints from the workspace root:
`make` failed before build: missing Perl dependency `Module::Build` at `Build.PL line 80`.
`make check` failed because there is no `check` target.
Focused checks run cleanly enough for planning:
`perl -Ilib -c lib/Munin/Node/OS.pm` reports syntax OK, with existing redefinition warnings.
Bounded independent probe: `Munin::Node::OS->run_as_child(3, sub { sleep 1; print "ok\n"; return 0; })` completed in about `1.001s`, `timed_out=0`, `stdout=ok`, so I cannot claim the observed Fixer signal is reproduced.
## Patch Pass
Subject: No patch: diagnose munin-node pselect profile
## Commit Message
No source change is proposed. The collected profile points at `munin-node` sleeping in `select`, not at a reproduced busy loop. `select` is the syscall Perl uses here to wait for file descriptors, and the captured calls blocked for roughly two seconds at a time.
## Evidence Confidence
inferred
## Issue Connection
Fixer collected a Perl process running `/usr/sbin/munin-node --foreground` with native frames under `select`/`pselect6`. The same bundle shows `State: S (sleeping)`, `wchan: poll_schedule_timeout`, total CPU around `0.9%`, and `strace` lines where `pselect6` timed out after about `1.8s` and `2.0s`.
I inspected the script entrypoint first, as required for an interpreter process. `script/munin-node` delegates to `Munin::Node::Server`, which uses `Net::Server::Fork`; plugin execution goes through `Munin::Node::Service::fork_service` and the local process helper `Munin::Node::OS->run_as_child`, bounded by `Munin::Common::Timeout::do_with_timeout`. I also checked the Perl runtime surface enough to confirm this workspace Perl has `select` support (`d_select='define'`), but the evidence does not show a runtime bug.
No code change was made. The cautious inference is that the profiler classified repeated blocking waits as a busy-poll signal, but the `/proc` and `strace` data do not show immediate wakeups or high CPU. The expected effect of leaving no source diff is to avoid an upstream patch that would alter Munin’s plugin waiting, timeout, or child reaping behavior without a reproduced or directly observed Munin defect.
This follows the saved plan in `plan-output.txt`; I did not change course.
## Git Add Paths
None
## Validation
`make` from the workspace root failed before building:
```text
/usr/bin/perl Build.PL --destdir="" --installdirs="site" --verbose
Can't locate Module/Build.pm in @INC ... at Build.PL line 80.
BEGIN failed--compilation aborted at Build.PL line 80.
make: *** [Makefile:149: Build] Error 2
```
`make check` from the workspace root failed because no target exists:
```text
make: *** No rule to make target 'check'. Stop.
```
Focused checks:
`perl -Ilib -c lib/Munin/Node/OS.pm` reported `syntax OK`, with existing subroutine redefinition warnings.
Bounded independent reproduction attempt:
```sh
perl -Ilib -MMunin::Node::OS -MTime::HiRes=time -e 'my $start=time; my $res=Munin::Node::OS->run_as_child(3, sub { sleep 1; print qq(ok\n); return 0; }); printf qq(elapsed=%.3f timed_out=%s stdout=%s\n), time-$start, ($res->{timed_out} ? 1 : 0), join(q(,), @{$res->{stdout} || []});'
```
Result: `elapsed=1.001 timed_out=0 stdout=ok`. This did not reproduce a busy loop; it showed the relevant child-wait path blocking normally.
## Review Pass 1
RESULT: ok
No source diff is present, and `git status`/`git diff` are clean. The patch output correctly treats the profiler/strace evidence as indirect, uses `## Evidence Confidence` = `inferred`, lists `None` under `## Git Add Paths`, and avoids presenting a speculative Munin source change as a confirmed fix.
The maintainer-facing explanation is cautious and tied to the evidence: the process was sleeping in `pselect6` with multi-second timeouts and low CPU, while the inspected Munin path uses `Net::Server::Fork`, `Munin::Node::OS->run_as_child`, and `Munin::Common::Timeout::do_with_timeout`. Validation also meets the requested shape: project-level `make` and `make check` were attempted with exact blockers, followed by a focused syntax check and a bounded independent probe that did not reproduce a busy loop.perl likely remains stuck in a busy-poll loop. A diagnosis report and patch proposal were created locally.
## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.
## Patch Pass
You are working on a bounded fixer proposal.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Produce the smallest reasonable patch for the target repository, keep the change upstreamable, prefer the clearest control flow available, and do not keep avoidable `goto` when a simpler structure would read better. Before introducing new file, process, allocation, locking, networking, or platform APIs, inspect nearby code and project contribution docs for existing helpers or compatibility wrappers and use those local patterns unless you can explain why they do not fit. Validate from a reproducible workspace-root entrypoint before falling back to focused leaf commands; if a build or test cannot run, report the exact command, the exact blocker, and any narrower check you ran instead. During validation, also try one bounded independent reproduction of the collected failure signal when it is safe and cheap, such as a failing test, smoke command, perf/strace comparison, or before/after runtime check. Only use `reproduced` if that command or test actually reproduced the failure; otherwise keep `observed` and report the reproduction blocker. The final explanation must connect the observed issue evidence to the actual code change, not just paraphrase the diff. Write like a maintainer is going to read the patch mail cold: explain the bug in plain language, define subsystem-specific jargon the first time you need it, and make the causal story obvious. Explicitly classify evidence confidence as `reproduced`, `observed`, or `inferred`: `reproduced` means you reproduced the failure locally; `observed` means Fixer has direct crash/log/trace evidence but you did not independently reproduce it; `inferred` means the source patch is not pull-request-ready, so do not leave a source diff unless you first gather stronger observed/reproduced evidence; otherwise return a no-patch diagnosis/report. For any source-changing `observed` patch, say explicitly in `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. Security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior need reproduced evidence plus explicit security-impact analysis before leaving a source diff; otherwise return a no-patch diagnosis/report for human review. If you introduce non-obvious state translation, index remapping, or backend split logic, add a short source comment that explains the invariant being preserved.
Start by explaining the likely root cause from the collected perf, strace, and /proc evidence. If you cannot land a safe patch, leave a diagnosis that is strong enough for an upstream bug report.
Interpreter process expectation: when the hot process is Python, Perl, shell, Node, Ruby, PHP, Lua, or another interpreter, inspect both the runtime and the script/application entrypoint from `details.interpreter_process`. Prefer the script or application package when evidence points there; do not patch the interpreter runtime merely because the hot binary is `python`, `perl`, `bash`, or similar. Runtime fixes are welcome only after checking the entrypoint and explaining why the runtime mishandles the workload or why running bad code faster/safer is itself the right upstream fix.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Keep the change narrowly scoped and summarize validation clearly.
In every authoring pass, your final response must start with `Subject: <single-line git commit subject>` and then include these markdown sections exactly:
## Commit Message
A short upstream-friendly explanation of what changed and why. Write it in plain language that a maintainer can follow without local complaint context. If you use subsystem jargon, define it immediately.
## Evidence Confidence
Exactly one word: `reproduced`, `observed`, or `inferred`. Use `reproduced` only when you reproduced the failure locally with a command or test, and include that command/test in `## Validation`. Use `observed` when Fixer has direct crash/log/trace evidence but you did not independently reproduce it. If `## Git Add Paths` lists source files for an `observed` patch, `## Issue Connection` must explicitly say the failure was observed by Fixer and not independently reproduced. Security-sensitive source changes touching authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior require reproduced evidence and explicit security-impact analysis; otherwise list `None` under `## Git Add Paths` and write a no-patch diagnosis/report. Use `inferred` for profiler/strace/indirect evidence; inferred responses may be no-patch diagnoses or reports, but inferred source patches are not pull-request-ready until stronger evidence is gathered.
## Issue Connection
Write this as maintainer-facing patch mail, not as local Fixer notes. Cover four things explicitly in readable sentences: the user-visible symptom or the exact collected signal, the code-level cause or the cautious inference from evidence, the specific change you made, and the expected effect. Do not invent a reproducer, command line, crash, or user-visible failure that is not present in the evidence bundle. If the evidence is direct-but-not-reproduced, say it was observed by Fixer and not independently reproduced. If the evidence is indirect and you did not gather stronger evidence, do not leave a source diff; write a no-patch diagnosis/report instead. Include an explicit effect sentence such as `The expected effect is ...`, `This should reduce ...`, or `This prevents ...` for source patches. If the logic is non-obvious in code, mention that you added a short explanatory comment.
## Git Add Paths
List the repo-relative paths that belong in the final patch, one per line. Use `None` only when you intentionally made no source changes. Include intentionally new files, and do not list generated build artifacts.
## Validation
List the checks you ran, or say clearly that you could not run them. Include the independent reproduction command/test and result when `## Evidence Confidence` is `reproduced`; if reproduction was attempted but blocked, name the exact blocker and keep confidence at `observed` or `inferred`.
Before editing, read the plan at `./plan-output.txt` and follow it unless the code proves part of it wrong. If you change course, say so explicitly in the final write-up instead of silently drifting from the plan.
## Review Pass 1
You are reviewing a freshly generated fixer patch.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Review the first patch pass. The original pre-edit snapshot is available at `./source` for diffing.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout. The latest author response is at `./patch-output.txt`. Inspect the current code and changed paths like a strict code reviewer. Focus on correctness, regressions, maintainability, awkward control flow such as avoidable `goto`, missing validation, weak or non-gittable commit message text, and explanations that fail to connect the observed issue evidence to the code change. Also review the maintainer experience: the patch mail should be easy to accept upstream, the user-visible bug should be explained in plain language, subsystem-specific jargon should be defined when first used, and any non-obvious state translation or index remapping in code should have a short explanatory comment. Reject patches that omit `## Evidence Confidence`, use anything other than `reproduced`, `observed`, or `inferred`, or sound more certain than that evidence level allows. Reject patches that claim `reproduced` unless `## Validation` names the concrete reproduction command or test and its result. Reject source patches in security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior unless the author reproduced the behavior and explicitly analyzed the security impact of the change; observed-only evidence should become a diagnosis/report, not a PR-ready source diff. Reject patches that invent a reproducer, command line, crash, or user-visible failure not present in the evidence bundle; indirect profiler or strace evidence may justify a cautious mitigation, but the author must say it is indirect instead of presenting it as a confirmed upstream bug. Reject patches that introduce generic libc/std APIs when nearby code or project docs provide a local compat/helper API for the same job, unless the author explicitly justifies the exception. Reject validation that only reports a leaf object/syntax build when a project-level configure/build/test entrypoint exists and was not attempted; if a full build cannot run, the author must show the exact failed command and blocker.
Do not apply code changes in this pass.
Return a short markdown review report. The first non-empty line must be exactly one of:
RESULT: ok
RESULT: fix-needed
If you choose `RESULT: fix-needed`, add a `## Findings` section with concrete, actionable items.## Plan Pass
## Problem
Fixer observed `/usr/sbin/munin-node --foreground` under Perl in repeated `pselect6`, but the retained signal does not prove a Munin busy loop. The process was sleeping, sampled at only `0.9%` CPU, and `strace` showed blocking `pselect6` calls lasting about `1.8s` and `2.0s`, which is consistent with normal waiting rather than runaway CPU.
## Evidence Confidence
observed
## Proposed Subject
No source patch yet: diagnose the opportunity as non-actionable with current evidence, unless a follow-up capture shows a real tight loop tied to Munin application code.
## Patch Plan
Do not edit Munin for this evidence bundle as-is. The likely code path is `script/munin-node` -> `Munin::Node::Server` -> plugin execution via `Munin::Node::Service::fork_service` -> `Munin::Node::OS::run_as_child`, where `_read_from_child` uses Perl `select` under the existing `Munin::Common::Timeout::do_with_timeout` helper.
If later evidence shows repeated immediate `select` returns or CPU burn in `_read_from_child`, patch that bounded loop directly in `lib/Munin/Node/OS.pm`, following local style from `HACKING.pod`: `use strict`, `use warnings`, `English`, one statement per line, no avoidable `goto`, and reuse `do_with_timeout` rather than adding a competing timeout mechanism.
No relevant prior Fixer patch was found. Existing Debian patches are unrelated to `munin-node` polling or child-output collection.
## Risks
Changing this path without stronger evidence could alter plugin timeout, child reaping, or stdout/stderr collection behavior. TLS/auth paths are nearby in `Munin::Node::Server`, but this plan does not touch authentication, authorization, credentials, cryptography, sandboxing, permissions, or throttling behavior.
## Validation
Tried project-level entrypoints from the workspace root:
`make` failed before build: missing Perl dependency `Module::Build` at `Build.PL line 80`.
`make check` failed because there is no `check` target.
Focused checks run cleanly enough for planning:
`perl -Ilib -c lib/Munin/Node/OS.pm` reports syntax OK, with existing redefinition warnings.
Bounded independent probe: `Munin::Node::OS->run_as_child(3, sub { sleep 1; print "ok\n"; return 0; })` completed in about `1.001s`, `timed_out=0`, `stdout=ok`, so I cannot claim the observed Fixer signal is reproduced.
## Patch Pass
Subject: No patch: diagnose munin-node pselect profile
## Commit Message
No source change is proposed. The collected profile points at `munin-node` sleeping in `select`, not at a reproduced busy loop. `select` is the syscall Perl uses here to wait for file descriptors, and the captured calls blocked for roughly two seconds at a time.
## Evidence Confidence
inferred
## Issue Connection
Fixer collected a Perl process running `/usr/sbin/munin-node --foreground` with native frames under `select`/`pselect6`. The same bundle shows `State: S (sleeping)`, `wchan: poll_schedule_timeout`, total CPU around `0.9%`, and `strace` lines where `pselect6` timed out after about `1.8s` and `2.0s`.
I inspected the script entrypoint first, as required for an interpreter process. `script/munin-node` delegates to `Munin::Node::Server`, which uses `Net::Server::Fork`; plugin execution goes through `Munin::Node::Service::fork_service` and the local process helper `Munin::Node::OS->run_as_child`, bounded by `Munin::Common::Timeout::do_with_timeout`. I also checked the Perl runtime surface enough to confirm this workspace Perl has `select` support (`d_select='define'`), but the evidence does not show a runtime bug.
No code change was made. The cautious inference is that the profiler classified repeated blocking waits as a busy-poll signal, but the `/proc` and `strace` data do not show immediate wakeups or high CPU. The expected effect of leaving no source diff is to avoid an upstream patch that would alter Munin’s plugin waiting, timeout, or child reaping behavior without a reproduced or directly observed Munin defect.
This follows the saved plan in `plan-output.txt`; I did not change course.
## Git Add Paths
None
## Validation
`make` from the workspace root failed before building:
```text
/usr/bin/perl Build.PL --destdir="" --installdirs="site" --verbose
Can't locate Module/Build.pm in @INC ... at Build.PL line 80.
BEGIN failed--compilation aborted at Build.PL line 80.
make: *** [Makefile:149: Build] Error 2
```
`make check` from the workspace root failed because no target exists:
```text
make: *** No rule to make target 'check'. Stop.
```
Focused checks:
`perl -Ilib -c lib/Munin/Node/OS.pm` reported `syntax OK`, with existing subroutine redefinition warnings.
Bounded independent reproduction attempt:
```sh
perl -Ilib -MMunin::Node::OS -MTime::HiRes=time -e 'my $start=time; my $res=Munin::Node::OS->run_as_child(3, sub { sleep 1; print qq(ok\n); return 0; }); printf qq(elapsed=%.3f timed_out=%s stdout=%s\n), time-$start, ($res->{timed_out} ? 1 : 0), join(q(,), @{$res->{stdout} || []});'
```
Result: `elapsed=1.001 timed_out=0 stdout=ok`. This did not reproduce a busy loop; it showed the relevant child-wait path blocking normally.
## Review Pass 1
RESULT: ok
No source diff is present, and `git status`/`git diff` are clean. The patch output correctly treats the profiler/strace evidence as indirect, uses `## Evidence Confidence` = `inferred`, lists `None` under `## Git Add Paths`, and avoids presenting a speculative Munin source change as a confirmed fix.
The maintainer-facing explanation is cautious and tied to the evidence: the process was sleeping in `pselect6` with multi-second timeouts and low CPU, while the inspected Munin path uses `Net::Server::Fork`, `Munin::Node::OS->run_as_child`, and `Munin::Common::Timeout::do_with_timeout`. Validation also meets the requested shape: project-level `make` and `make check` were attempted with exact blockers, followed by a focused syntax check and a bounded independent probe that did not reproduce a busy loop.perl likely remains stuck in a busy-poll loop. A diagnosis report and patch proposal were created locally.
## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.
## Patch Pass
You are working on a bounded fixer proposal.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Produce the smallest reasonable patch for the target repository, keep the change upstreamable, prefer the clearest control flow available, and do not keep avoidable `goto` when a simpler structure would read better. Before introducing new file, process, allocation, locking, networking, or platform APIs, inspect nearby code and project contribution docs for existing helpers or compatibility wrappers and use those local patterns unless you can explain why they do not fit. Validate from a reproducible workspace-root entrypoint before falling back to focused leaf commands; if a build or test cannot run, report the exact command, the exact blocker, and any narrower check you ran instead. During validation, also try one bounded independent reproduction of the collected failure signal when it is safe and cheap, such as a failing test, smoke command, perf/strace comparison, or before/after runtime check. Only use `reproduced` if that command or test actually reproduced the failure; otherwise keep `observed` and report the reproduction blocker. The final explanation must connect the observed issue evidence to the actual code change, not just paraphrase the diff. Write like a maintainer is going to read the patch mail cold: explain the bug in plain language, define subsystem-specific jargon the first time you need it, and make the causal story obvious. Explicitly classify evidence confidence as `reproduced`, `observed`, or `inferred`: `reproduced` means you reproduced the failure locally; `observed` means Fixer has direct crash/log/trace evidence but you did not independently reproduce it; `inferred` means the source patch is not pull-request-ready, so do not leave a source diff unless you first gather stronger observed/reproduced evidence; otherwise return a no-patch diagnosis/report. For any source-changing `observed` patch, say explicitly in `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. Security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior need reproduced evidence plus explicit security-impact analysis before leaving a source diff; otherwise return a no-patch diagnosis/report for human review. If you introduce non-obvious state translation, index remapping, or backend split logic, add a short source comment that explains the invariant being preserved.
Start by explaining the likely root cause from the collected perf, strace, and /proc evidence. If you cannot land a safe patch, leave a diagnosis that is strong enough for an upstream bug report.
Interpreter process expectation: when the hot process is Python, Perl, shell, Node, Ruby, PHP, Lua, or another interpreter, inspect both the runtime and the script/application entrypoint from `details.interpreter_process`. Prefer the script or application package when evidence points there; do not patch the interpreter runtime merely because the hot binary is `python`, `perl`, `bash`, or similar. Runtime fixes are welcome only after checking the entrypoint and explaining why the runtime mishandles the workload or why running bad code faster/safer is itself the right upstream fix.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Keep the change narrowly scoped and summarize validation clearly.
In every authoring pass, your final response must start with `Subject: <single-line git commit subject>` and then include these markdown sections exactly:
## Commit Message
A short upstream-friendly explanation of what changed and why. Write it in plain language that a maintainer can follow without local complaint context. If you use subsystem jargon, define it immediately.
## Evidence Confidence
Exactly one word: `reproduced`, `observed`, or `inferred`. Use `reproduced` only when you reproduced the failure locally with a command or test, and include that command/test in `## Validation`. Use `observed` when Fixer has direct crash/log/trace evidence but you did not independently reproduce it. If `## Git Add Paths` lists source files for an `observed` patch, `## Issue Connection` must explicitly say the failure was observed by Fixer and not independently reproduced. Security-sensitive source changes touching authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior require reproduced evidence and explicit security-impact analysis; otherwise list `None` under `## Git Add Paths` and write a no-patch diagnosis/report. Use `inferred` for profiler/strace/indirect evidence; inferred responses may be no-patch diagnoses or reports, but inferred source patches are not pull-request-ready until stronger evidence is gathered.
## Issue Connection
Write this as maintainer-facing patch mail, not as local Fixer notes. Cover four things explicitly in readable sentences: the user-visible symptom or the exact collected signal, the code-level cause or the cautious inference from evidence, the specific change you made, and the expected effect. Do not invent a reproducer, command line, crash, or user-visible failure that is not present in the evidence bundle. If the evidence is direct-but-not-reproduced, say it was observed by Fixer and not independently reproduced. If the evidence is indirect and you did not gather stronger evidence, do not leave a source diff; write a no-patch diagnosis/report instead. Include an explicit effect sentence such as `The expected effect is ...`, `This should reduce ...`, or `This prevents ...` for source patches. If the logic is non-obvious in code, mention that you added a short explanatory comment.
## Git Add Paths
List the repo-relative paths that belong in the final patch, one per line. Use `None` only when you intentionally made no source changes. Include intentionally new files, and do not list generated build artifacts.
## Validation
List the checks you ran, or say clearly that you could not run them. Include the independent reproduction command/test and result when `## Evidence Confidence` is `reproduced`; if reproduction was attempted but blocked, name the exact blocker and keep confidence at `observed` or `inferred`.
Before editing, read the plan at `./plan-output.txt` and follow it unless the code proves part of it wrong. If you change course, say so explicitly in the final write-up instead of silently drifting from the plan.
## Review Pass 1
You are reviewing a freshly generated fixer patch.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Review the first patch pass. The original pre-edit snapshot is available at `./source` for diffing.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout. The latest author response is at `./patch-output.txt`. Inspect the current code and changed paths like a strict code reviewer. Focus on correctness, regressions, maintainability, awkward control flow such as avoidable `goto`, missing validation, weak or non-gittable commit message text, and explanations that fail to connect the observed issue evidence to the code change. Also review the maintainer experience: the patch mail should be easy to accept upstream, the user-visible bug should be explained in plain language, subsystem-specific jargon should be defined when first used, and any non-obvious state translation or index remapping in code should have a short explanatory comment. Reject patches that omit `## Evidence Confidence`, use anything other than `reproduced`, `observed`, or `inferred`, or sound more certain than that evidence level allows. Reject patches that claim `reproduced` unless `## Validation` names the concrete reproduction command or test and its result. Reject source patches in security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior unless the author reproduced the behavior and explicitly analyzed the security impact of the change; observed-only evidence should become a diagnosis/report, not a PR-ready source diff. Reject patches that invent a reproducer, command line, crash, or user-visible failure not present in the evidence bundle; indirect profiler or strace evidence may justify a cautious mitigation, but the author must say it is indirect instead of presenting it as a confirmed upstream bug. Reject patches that introduce generic libc/std APIs when nearby code or project docs provide a local compat/helper API for the same job, unless the author explicitly justifies the exception. Reject validation that only reports a leaf object/syntax build when a project-level configure/build/test entrypoint exists and was not attempted; if a full build cannot run, the author must show the exact failed command and blocker.
Do not apply code changes in this pass.
Return a short markdown review report. The first non-empty line must be exactly one of:
RESULT: ok
RESULT: fix-needed
If you choose `RESULT: fix-needed`, add a `## Findings` section with concrete, actionable items.## Plan Pass
## Problem
Fixer observed `munin-node` as `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` returning repeatedly to `pselect6`, but the retained evidence also shows blocking waits around 1.8-2.0s, process state `S (sleeping)`, and only 0.9% CPU. The bundle does not include a Perl-level stack or script-line attribution, so a confirmed munin source bug is not established.
## Evidence Confidence
observed
## Proposed Subject
No source patch yet: collect source-level evidence for the suspected `munin-node` select loop before changing upstream behavior.
## Patch Plan
Do not edit files in this pass. The evidence is profiler/strace-level and explicitly says it did not prove whether the loop comes from application logic or the Perl runtime.
If later reproduction shows an actual hot loop in munin, investigate `script/munin-node` and `lib/Munin/Node/Server.pm` first, not Perl itself. Follow local conventions from `CONTRIBUTING.md`/`HACKING.pod`: `use strict`, `use warnings`, taint-compatible code, `English qw(-no_match_vars)`, no Perl warnings, and file-local indentation style.
Use existing helpers and conventions: `Munin::Common::Timeout::do_with_timeout`, `Munin::Common::Logger` logging functions, and `Munin::Node::Server`’s `_net_read`/`_net_write` wrappers. Avoid awkward control flow such as avoidable `goto`; any eventual mitigation should be a small bounded guard or configuration handling change.
No prior Fixer patch is present beyond the baseline commit. Existing Debian patches are unrelated to this signal (`async-spool-directory`, `limitsold-load-config`, `shortcut-travis-dependent-tests`, `disable-munin-limits`) and should not be extended as a Debian-only workaround.
## Risks
Changing select timeout, idle wakeup, or throttling behavior is timing-sensitive and could affect connection handling, daemon responsiveness, or denial-of-service characteristics. Without reproduction and source attribution, a source patch would likely be speculative and not pull-request-ready.
## Validation
First try the project entrypoint from the workspace root: `make`. `make check` is not available here (`No rule to make target 'check'`).
If dependencies or generated files block `make`, record the exact failure and then run the narrow checks: `perl -Ilib -c script/munin-node` and `perl -Ilib -c lib/Munin/Node/Server.pm`.
Bounded independent reproduction attempt before any source patch: run `munin-node --foreground` against test/minimal config under a short `strace -ttT -f -e trace=pselect6,select,poll,ppoll,epoll_wait,nanosleep,clock_nanosleep` window, and only proceed if it demonstrates non-blocking or unexpectedly rapid wakeups tied to munin-node behavior.
## Patch Pass
Subject: Diagnose munin-node select-loop evidence without patch
## Commit Message
No source change is proposed. The collected evidence points to `munin-node` waiting in Perl/Net::Server’s select path, but the retained `/proc` and `strace` data show a sleeping process with timed `pselect6` waits, not a locally reproduced hot loop.
## Evidence Confidence
inferred
## Issue Connection
Fixer collected a perf/backtrace signal for `/usr/bin/perl -wT /usr/sbin/munin-node --foreground`, with stack frames under `select()` and three observed `pselect6` calls. The same bundle reports process state `S (sleeping)`, max CPU 0.9%, and `pselect6` calls blocking for about 1.8-2.0 seconds, so the likely root cause is an idle `munin-node` server wait being classified as a busy-poll signal rather than a proven munin source bug.
I inspected the script entrypoint first (`script/munin-node`) and the relevant server subsystem (`lib/Munin/Node/Server.pm`), rather than patching Perl. The local code uses `Net::Server::Fork`, `Munin::Common::Timeout::do_with_timeout`, `Munin::Common::Logger`, and `_net_read`/`_net_write` wrappers. `CONTRIBUTING.md` and `HACKING.pod` require taint-compatible Perl with `strict`/`warnings` and local style. No relevant source-level cause was found, and changing idle select timeout behavior would be timing-sensitive without reproduced evidence.
No patch was made. The expected effect is to avoid landing a speculative timing/throttling change until a Perl-level stack, trace, or local reproduction ties the wakeups to munin application logic.
## Git Add Paths
None
## Validation
`make` failed from the workspace root because `Module::Build` is missing: `Can't locate Module/Build.pm in @INC ... at Build.PL line 80`.
`make check` failed because the target does not exist: `No rule to make target 'check'`.
Focused checks:
`perl -T -Ilib -c script/munin-node` passed.
`perl -Ilib -c lib/Munin/Node/Server.pm` passed.
Independent reproduction attempt:
`strace -ttT -f -e trace=pselect6,select,poll,ppoll,epoll_wait,nanosleep,clock_nanosleep ... munin-node --foreground ...` was blocked by sandbox ptrace restrictions: `PTRACE_TRACEME: Operation not permitted`.
A fallback foreground smoke with a temporary config was also blocked by sandbox networking: `Cannot bind and listen to TCP port 24949 on 127.0.0.1 [Operation not permitted]`.
No files were changed; `git status --short` and `git diff --stat` were clean.
## Review Pass 1
RESULT: ok
No source patch was left in the workspace, which matches the evidence limits. The author correctly treated the perf/strace signal as insufficient for a PR-ready timing change, inspected the Perl script entrypoint and `munin-node` server subsystem, named relevant local helpers/conventions, and reported project-level validation blockers before focused syntax checks.
The final response uses a valid `## Evidence Confidence` value, does not claim reproduction, does not invent a user-visible failure, and keeps `## Git Add Paths` as `None`.perl likely remains stuck in a busy-poll loop. A diagnosis report and patch proposal were created locally.
## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.
## Patch Pass
You are working on a bounded fixer proposal.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Produce the smallest reasonable patch for the target repository, keep the change upstreamable, prefer the clearest control flow available, and do not keep avoidable `goto` when a simpler structure would read better. Before introducing new file, process, allocation, locking, networking, or platform APIs, inspect nearby code and project contribution docs for existing helpers or compatibility wrappers and use those local patterns unless you can explain why they do not fit. Validate from a reproducible workspace-root entrypoint before falling back to focused leaf commands; if a build or test cannot run, report the exact command, the exact blocker, and any narrower check you ran instead. During validation, also try one bounded independent reproduction of the collected failure signal when it is safe and cheap, such as a failing test, smoke command, perf/strace comparison, or before/after runtime check. Only use `reproduced` if that command or test actually reproduced the failure; otherwise keep `observed` and report the reproduction blocker. The final explanation must connect the observed issue evidence to the actual code change, not just paraphrase the diff. Write like a maintainer is going to read the patch mail cold: explain the bug in plain language, define subsystem-specific jargon the first time you need it, and make the causal story obvious. Explicitly classify evidence confidence as `reproduced`, `observed`, or `inferred`: `reproduced` means you reproduced the failure locally; `observed` means Fixer has direct crash/log/trace evidence but you did not independently reproduce it; `inferred` means the source patch is not pull-request-ready, so do not leave a source diff unless you first gather stronger observed/reproduced evidence; otherwise return a no-patch diagnosis/report. For any source-changing `observed` patch, say explicitly in `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. Security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior need reproduced evidence plus explicit security-impact analysis before leaving a source diff; otherwise return a no-patch diagnosis/report for human review. If you introduce non-obvious state translation, index remapping, or backend split logic, add a short source comment that explains the invariant being preserved.
Start by explaining the likely root cause from the collected perf, strace, and /proc evidence. If you cannot land a safe patch, leave a diagnosis that is strong enough for an upstream bug report.
Interpreter process expectation: when the hot process is Python, Perl, shell, Node, Ruby, PHP, Lua, or another interpreter, inspect both the runtime and the script/application entrypoint from `details.interpreter_process`. Prefer the script or application package when evidence points there; do not patch the interpreter runtime merely because the hot binary is `python`, `perl`, `bash`, or similar. Runtime fixes are welcome only after checking the entrypoint and explaining why the runtime mishandles the workload or why running bad code faster/safer is itself the right upstream fix.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Keep the change narrowly scoped and summarize validation clearly.
In every authoring pass, your final response must start with `Subject: <single-line git commit subject>` and then include these markdown sections exactly:
## Commit Message
A short upstream-friendly explanation of what changed and why. Write it in plain language that a maintainer can follow without local complaint context. If you use subsystem jargon, define it immediately.
## Evidence Confidence
Exactly one word: `reproduced`, `observed`, or `inferred`. Use `reproduced` only when you reproduced the failure locally with a command or test, and include that command/test in `## Validation`. Use `observed` when Fixer has direct crash/log/trace evidence but you did not independently reproduce it. If `## Git Add Paths` lists source files for an `observed` patch, `## Issue Connection` must explicitly say the failure was observed by Fixer and not independently reproduced. Security-sensitive source changes touching authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior require reproduced evidence and explicit security-impact analysis; otherwise list `None` under `## Git Add Paths` and write a no-patch diagnosis/report. Use `inferred` for profiler/strace/indirect evidence; inferred responses may be no-patch diagnoses or reports, but inferred source patches are not pull-request-ready until stronger evidence is gathered.
## Issue Connection
Write this as maintainer-facing patch mail, not as local Fixer notes. Cover four things explicitly in readable sentences: the user-visible symptom or the exact collected signal, the code-level cause or the cautious inference from evidence, the specific change you made, and the expected effect. Do not invent a reproducer, command line, crash, or user-visible failure that is not present in the evidence bundle. If the evidence is direct-but-not-reproduced, say it was observed by Fixer and not independently reproduced. If the evidence is indirect and you did not gather stronger evidence, do not leave a source diff; write a no-patch diagnosis/report instead. Include an explicit effect sentence such as `The expected effect is ...`, `This should reduce ...`, or `This prevents ...` for source patches. If the logic is non-obvious in code, mention that you added a short explanatory comment.
## Git Add Paths
List the repo-relative paths that belong in the final patch, one per line. Use `None` only when you intentionally made no source changes. Include intentionally new files, and do not list generated build artifacts.
## Validation
List the checks you ran, or say clearly that you could not run them. Include the independent reproduction command/test and result when `## Evidence Confidence` is `reproduced`; if reproduction was attempted but blocked, name the exact blocker and keep confidence at `observed` or `inferred`.
Before editing, read the plan at `./plan-output.txt` and follow it unless the code proves part of it wrong. If you change course, say so explicitly in the final write-up instead of silently drifting from the plan.
## Review Pass 1
You are reviewing a freshly generated fixer patch.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Review the first patch pass. The original pre-edit snapshot is available at `./source` for diffing.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout. The latest author response is at `./patch-output.txt`. Inspect the current code and changed paths like a strict code reviewer. Focus on correctness, regressions, maintainability, awkward control flow such as avoidable `goto`, missing validation, weak or non-gittable commit message text, and explanations that fail to connect the observed issue evidence to the code change. Also review the maintainer experience: the patch mail should be easy to accept upstream, the user-visible bug should be explained in plain language, subsystem-specific jargon should be defined when first used, and any non-obvious state translation or index remapping in code should have a short explanatory comment. Reject patches that omit `## Evidence Confidence`, use anything other than `reproduced`, `observed`, or `inferred`, or sound more certain than that evidence level allows. Reject patches that claim `reproduced` unless `## Validation` names the concrete reproduction command or test and its result. Reject source patches in security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior unless the author reproduced the behavior and explicitly analyzed the security impact of the change; observed-only evidence should become a diagnosis/report, not a PR-ready source diff. Reject patches that invent a reproducer, command line, crash, or user-visible failure not present in the evidence bundle; indirect profiler or strace evidence may justify a cautious mitigation, but the author must say it is indirect instead of presenting it as a confirmed upstream bug. Reject patches that introduce generic libc/std APIs when nearby code or project docs provide a local compat/helper API for the same job, unless the author explicitly justifies the exception. Reject validation that only reports a leaf object/syntax build when a project-level configure/build/test entrypoint exists and was not attempted; if a full build cannot run, the author must show the exact failed command and blocker.
Do not apply code changes in this pass.
Return a short markdown review report. The first non-empty line must be exactly one of:
RESULT: ok
RESULT: fix-needed
If you choose `RESULT: fix-needed`, add a `## Findings` section with concrete, actionable items.## Plan Pass
## Problem
Fixer observed `munin-node` as `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` returning repeatedly to `pselect6`, but the retained evidence also shows blocking waits around 1.8-2.0s, process state `S (sleeping)`, and only 0.9% CPU. The bundle does not include a Perl-level stack or script-line attribution, so a confirmed munin source bug is not established.
## Evidence Confidence
observed
## Proposed Subject
No source patch yet: collect source-level evidence for the suspected `munin-node` select loop before changing upstream behavior.
## Patch Plan
Do not edit files in this pass. The evidence is profiler/strace-level and explicitly says it did not prove whether the loop comes from application logic or the Perl runtime.
If later reproduction shows an actual hot loop in munin, investigate `script/munin-node` and `lib/Munin/Node/Server.pm` first, not Perl itself. Follow local conventions from `CONTRIBUTING.md`/`HACKING.pod`: `use strict`, `use warnings`, taint-compatible code, `English qw(-no_match_vars)`, no Perl warnings, and file-local indentation style.
Use existing helpers and conventions: `Munin::Common::Timeout::do_with_timeout`, `Munin::Common::Logger` logging functions, and `Munin::Node::Server`’s `_net_read`/`_net_write` wrappers. Avoid awkward control flow such as avoidable `goto`; any eventual mitigation should be a small bounded guard or configuration handling change.
No prior Fixer patch is present beyond the baseline commit. Existing Debian patches are unrelated to this signal (`async-spool-directory`, `limitsold-load-config`, `shortcut-travis-dependent-tests`, `disable-munin-limits`) and should not be extended as a Debian-only workaround.
## Risks
Changing select timeout, idle wakeup, or throttling behavior is timing-sensitive and could affect connection handling, daemon responsiveness, or denial-of-service characteristics. Without reproduction and source attribution, a source patch would likely be speculative and not pull-request-ready.
## Validation
First try the project entrypoint from the workspace root: `make`. `make check` is not available here (`No rule to make target 'check'`).
If dependencies or generated files block `make`, record the exact failure and then run the narrow checks: `perl -Ilib -c script/munin-node` and `perl -Ilib -c lib/Munin/Node/Server.pm`.
Bounded independent reproduction attempt before any source patch: run `munin-node --foreground` against test/minimal config under a short `strace -ttT -f -e trace=pselect6,select,poll,ppoll,epoll_wait,nanosleep,clock_nanosleep` window, and only proceed if it demonstrates non-blocking or unexpectedly rapid wakeups tied to munin-node behavior.
## Patch Pass
Subject: Diagnose munin-node select-loop evidence without patch
## Commit Message
No source change is proposed. The collected evidence points to `munin-node` waiting in Perl/Net::Server’s select path, but the retained `/proc` and `strace` data show a sleeping process with timed `pselect6` waits, not a locally reproduced hot loop.
## Evidence Confidence
inferred
## Issue Connection
Fixer collected a perf/backtrace signal for `/usr/bin/perl -wT /usr/sbin/munin-node --foreground`, with stack frames under `select()` and three observed `pselect6` calls. The same bundle reports process state `S (sleeping)`, max CPU 0.9%, and `pselect6` calls blocking for about 1.8-2.0 seconds, so the likely root cause is an idle `munin-node` server wait being classified as a busy-poll signal rather than a proven munin source bug.
I inspected the script entrypoint first (`script/munin-node`) and the relevant server subsystem (`lib/Munin/Node/Server.pm`), rather than patching Perl. The local code uses `Net::Server::Fork`, `Munin::Common::Timeout::do_with_timeout`, `Munin::Common::Logger`, and `_net_read`/`_net_write` wrappers. `CONTRIBUTING.md` and `HACKING.pod` require taint-compatible Perl with `strict`/`warnings` and local style. No relevant source-level cause was found, and changing idle select timeout behavior would be timing-sensitive without reproduced evidence.
No patch was made. The expected effect is to avoid landing a speculative timing/throttling change until a Perl-level stack, trace, or local reproduction ties the wakeups to munin application logic.
## Git Add Paths
None
## Validation
`make` failed from the workspace root because `Module::Build` is missing: `Can't locate Module/Build.pm in @INC ... at Build.PL line 80`.
`make check` failed because the target does not exist: `No rule to make target 'check'`.
Focused checks:
`perl -T -Ilib -c script/munin-node` passed.
`perl -Ilib -c lib/Munin/Node/Server.pm` passed.
Independent reproduction attempt:
`strace -ttT -f -e trace=pselect6,select,poll,ppoll,epoll_wait,nanosleep,clock_nanosleep ... munin-node --foreground ...` was blocked by sandbox ptrace restrictions: `PTRACE_TRACEME: Operation not permitted`.
A fallback foreground smoke with a temporary config was also blocked by sandbox networking: `Cannot bind and listen to TCP port 24949 on 127.0.0.1 [Operation not permitted]`.
No files were changed; `git status --short` and `git diff --stat` were clean.
## Review Pass 1
RESULT: ok
No source patch was left in the workspace, which matches the evidence limits. The author correctly treated the perf/strace signal as insufficient for a PR-ready timing change, inspected the Perl script entrypoint and `munin-node` server subsystem, named relevant local helpers/conventions, and reported project-level validation blockers before focused syntax checks.
The final response uses a valid `## Evidence Confidence` value, does not claim reproduction, does not invent a user-visible failure, and keeps `## Git Add Paths` as `None`.perl likely remains stuck in a busy-poll loop. A diagnosis report and patch proposal were created locally.
## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.
## Patch Pass
You are working on a bounded fixer proposal.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Produce the smallest reasonable patch for the target repository, keep the change upstreamable, prefer the clearest control flow available, and do not keep avoidable `goto` when a simpler structure would read better. Before introducing new file, process, allocation, locking, networking, or platform APIs, inspect nearby code and project contribution docs for existing helpers or compatibility wrappers and use those local patterns unless you can explain why they do not fit. Validate from a reproducible workspace-root entrypoint before falling back to focused leaf commands; if a build or test cannot run, report the exact command, the exact blocker, and any narrower check you ran instead. During validation, also try one bounded independent reproduction of the collected failure signal when it is safe and cheap, such as a failing test, smoke command, perf/strace comparison, or before/after runtime check. Only use `reproduced` if that command or test actually reproduced the failure; otherwise keep `observed` and report the reproduction blocker. The final explanation must connect the observed issue evidence to the actual code change, not just paraphrase the diff. Write like a maintainer is going to read the patch mail cold: explain the bug in plain language, define subsystem-specific jargon the first time you need it, and make the causal story obvious. Explicitly classify evidence confidence as `reproduced`, `observed`, or `inferred`: `reproduced` means you reproduced the failure locally; `observed` means Fixer has direct crash/log/trace evidence but you did not independently reproduce it; `inferred` means the source patch is not pull-request-ready, so do not leave a source diff unless you first gather stronger observed/reproduced evidence; otherwise return a no-patch diagnosis/report. For any source-changing `observed` patch, say explicitly in `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. Security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior need reproduced evidence plus explicit security-impact analysis before leaving a source diff; otherwise return a no-patch diagnosis/report for human review. If you introduce non-obvious state translation, index remapping, or backend split logic, add a short source comment that explains the invariant being preserved.
Start by explaining the likely root cause from the collected perf, strace, and /proc evidence. If you cannot land a safe patch, leave a diagnosis that is strong enough for an upstream bug report.
Interpreter process expectation: when the hot process is Python, Perl, shell, Node, Ruby, PHP, Lua, or another interpreter, inspect both the runtime and the script/application entrypoint from `details.interpreter_process`. Prefer the script or application package when evidence points there; do not patch the interpreter runtime merely because the hot binary is `python`, `perl`, `bash`, or similar. Runtime fixes are welcome only after checking the entrypoint and explaining why the runtime mishandles the workload or why running bad code faster/safer is itself the right upstream fix.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Keep the change narrowly scoped and summarize validation clearly.
In every authoring pass, your final response must start with `Subject: <single-line git commit subject>` and then include these markdown sections exactly:
## Commit Message
A short upstream-friendly explanation of what changed and why. Write it in plain language that a maintainer can follow without local complaint context. If you use subsystem jargon, define it immediately.
## Evidence Confidence
Exactly one word: `reproduced`, `observed`, or `inferred`. Use `reproduced` only when you reproduced the failure locally with a command or test, and include that command/test in `## Validation`. Use `observed` when Fixer has direct crash/log/trace evidence but you did not independently reproduce it. If `## Git Add Paths` lists source files for an `observed` patch, `## Issue Connection` must explicitly say the failure was observed by Fixer and not independently reproduced. Security-sensitive source changes touching authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior require reproduced evidence and explicit security-impact analysis; otherwise list `None` under `## Git Add Paths` and write a no-patch diagnosis/report. Use `inferred` for profiler/strace/indirect evidence; inferred responses may be no-patch diagnoses or reports, but inferred source patches are not pull-request-ready until stronger evidence is gathered.
## Issue Connection
Write this as maintainer-facing patch mail, not as local Fixer notes. Cover four things explicitly in readable sentences: the user-visible symptom or the exact collected signal, the code-level cause or the cautious inference from evidence, the specific change you made, and the expected effect. Do not invent a reproducer, command line, crash, or user-visible failure that is not present in the evidence bundle. If the evidence is direct-but-not-reproduced, say it was observed by Fixer and not independently reproduced. If the evidence is indirect and you did not gather stronger evidence, do not leave a source diff; write a no-patch diagnosis/report instead. Include an explicit effect sentence such as `The expected effect is ...`, `This should reduce ...`, or `This prevents ...` for source patches. If the logic is non-obvious in code, mention that you added a short explanatory comment.
## Git Add Paths
List the repo-relative paths that belong in the final patch, one per line. Use `None` only when you intentionally made no source changes. Include intentionally new files, and do not list generated build artifacts.
## Validation
List the checks you ran, or say clearly that you could not run them. Include the independent reproduction command/test and result when `## Evidence Confidence` is `reproduced`; if reproduction was attempted but blocked, name the exact blocker and keep confidence at `observed` or `inferred`.
Before editing, read the plan at `./plan-output.txt` and follow it unless the code proves part of it wrong. If you change course, say so explicitly in the final write-up instead of silently drifting from the plan.
## Review Pass 1
You are reviewing a freshly generated fixer patch.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Review the first patch pass. The original pre-edit snapshot is available at `./source` for diffing.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout. The latest author response is at `./patch-output.txt`. Inspect the current code and changed paths like a strict code reviewer. Focus on correctness, regressions, maintainability, awkward control flow such as avoidable `goto`, missing validation, weak or non-gittable commit message text, and explanations that fail to connect the observed issue evidence to the code change. Also review the maintainer experience: the patch mail should be easy to accept upstream, the user-visible bug should be explained in plain language, subsystem-specific jargon should be defined when first used, and any non-obvious state translation or index remapping in code should have a short explanatory comment. Reject patches that omit `## Evidence Confidence`, use anything other than `reproduced`, `observed`, or `inferred`, or sound more certain than that evidence level allows. Reject patches that claim `reproduced` unless `## Validation` names the concrete reproduction command or test and its result. Reject source patches in security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior unless the author reproduced the behavior and explicitly analyzed the security impact of the change; observed-only evidence should become a diagnosis/report, not a PR-ready source diff. Reject patches that invent a reproducer, command line, crash, or user-visible failure not present in the evidence bundle; indirect profiler or strace evidence may justify a cautious mitigation, but the author must say it is indirect instead of presenting it as a confirmed upstream bug. Reject patches that introduce generic libc/std APIs when nearby code or project docs provide a local compat/helper API for the same job, unless the author explicitly justifies the exception. Reject validation that only reports a leaf object/syntax build when a project-level configure/build/test entrypoint exists and was not attempted; if a full build cannot run, the author must show the exact failed command and blocker.
Do not apply code changes in this pass.
Return a short markdown review report. The first non-empty line must be exactly one of:
RESULT: ok
RESULT: fix-needed
If you choose `RESULT: fix-needed`, add a `## Findings` section with concrete, actionable items.## Plan Pass
## Problem
Fixer observed `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` in a poll-family syscall path, but the retained evidence does not prove a Munin busy loop. The embedded `strace` excerpt shows `pselect6(..., {tv_sec=1.813...})` and then `pselect6(..., {tv_sec=2})` timing out after multi-second waits, with process state `S (sleeping)` and max CPU `0.9%`. That looks more like normal `Net::Server::Fork` idle accept-loop behavior than runaway CPU.
## Evidence Confidence
observed
## Proposed Subject
No source patch: diagnose this as an unconfirmed runaway-process report for `munin-node` idle polling, and only patch later if an independent reproduction shows a true zero-timeout or near-zero-timeout spin tied to Munin code.
## Patch Plan
1. Do not edit files in this pass.
2. Treat `script/munin-node` as the entrypoint and `lib/Munin/Node/Server.pm` as the relevant subsystem, not Perl runtime internals.
3. Document that Munin uses `Net::Server::Fork` for the server loop, `Munin::Common::Timeout::do_with_timeout` for request/plugin timeouts, `Munin::Common::Logger` for logging, `Munin::Common::Daemon::emit_sd_notify_message` for readiness, and `Munin::Node::Service`/`Munin::Node::OS->run_as_child` for plugin execution. No local helper was found for replacing the inherited `Net::Server` idle `select`.
4. Note maintainer conventions from `CONTRIBUTING.md` and `HACKING.pod`: strict/warnings Perl, taint-mode awareness, present-tense imperative commits, no warnings, follow local file style.
5. If later evidence proves a Munin-side busy loop, patch the smallest bounded loop or timeout calculation in the implicated Munin module, using existing logging/timeout helpers and straightforward conditionals or early returns. Do not introduce avoidable `goto`.
6. No prior Fixer patch for this finding was found; existing Debian quilt patches are unrelated.
## Risks
A source patch based only on this evidence would likely change idle daemon behavior without a demonstrated bug. The evidence implicates authentication/TLS-adjacent server code only indirectly, so changing request-loop or TLS handling without reproduction would be security-sensitive and not pull-request-ready.
## Validation
Before any future patch is reported, try the project entrypoints from the workspace root: `make`, then `make test` because this tree has `test` rather than `check`. If those fail due to missing Perl build/test dependencies or generated files, record the exact command and failure.
For bounded independent reproduction, build enough to run the node, start `script/munin-node --foreground` with a minimal local config and empty plugin directory if dependencies allow, then capture `strace -ttT -f -e trace=pselect6,select,poll,ppoll` for a few seconds. A patch should only proceed if that shows repeated immediate returns or high CPU tied to Munin logic; the current evidence only shows observed sleeping `pselect6` timeouts.
## Patch Pass
Subject: No patch: diagnose munin-node idle poll evidence
## Commit Message
The likely root cause is an over-classified idle wait, not a proven Munin busy loop. Fixer saw `munin-node` under Perl in `pselect6`, but `/proc` showed the process sleeping, CPU was only `0.9%`, and the retained `strace` lines show 1.8-2.0 second blocking timeouts. No source change is left because the evidence does not identify a Munin loop that can be safely patched.
## Evidence Confidence
inferred
## Issue Connection
Fixer collected a profiler and syscall trace for `/usr/bin/perl -wT /usr/sbin/munin-node --foreground`: native frames were under Perl `select()`, the top syscall sequence was `pselect6`, and the kernel stack was in `poll_schedule_timeout`. The same evidence also shows `State: S (sleeping)`, max CPU of `0.9%`, and `pselect6` calls blocking for about two seconds, which is consistent with an idle `Net::Server::Fork` accept loop rather than a tight busy-poll loop.
I inspected the Perl entrypoint `script/munin-node` before considering the Perl runtime. The relevant server code is `lib/Munin/Node/Server.pm`, which delegates the listener loop to `Net::Server::Fork`; Munin’s own request path uses local helpers and conventions including `Munin::Common::Timeout::do_with_timeout`, `Munin::Common::Logger`, `Munin::Common::Daemon::emit_sd_notify_message`, and `Munin::Node::Service->fork_service`. I also checked the runtime enough to confirm this is Perl 5.40.1, but there is no evidence that Perl itself mishandled the workload.
I followed the saved no-patch plan. I changed only the confidence classification from the plan’s `observed` to `inferred` because the current authoring rules classify profiler/strace-only, not independently reproduced evidence as inferred when it does not support a pull-request-ready source patch. The expected effect is no behavioral change; an upstream report should ask for stronger evidence, such as a Perl-level stack or an attach/run trace showing immediate repeated `pselect6` returns with high CPU.
## Git Add Paths
None
## Validation
`make` from the workspace root failed before building:
`Can't locate Module/Build.pm in @INC ... at Build.PL line 80`, followed by `make: *** [Makefile:149: Build] Error 2`.
`make check` is not an available target in this tree; the project exposes `make test`, but it depends on the same `Build` generation blocked by missing `Module::Build`.
Narrow checks run:
`perl -Ilib -c lib/Munin/Node/Server.pm` passed.
`perl -T -Ilib -c script/munin-node` passed.
Independent reproduction attempts were blocked:
`strace -ttT -f -e trace=pselect6,select,poll,ppoll ... script/munin-node ...` failed with `PTRACE_TRACEME: Operation not permitted`.
A non-ptrace foreground smoke run with a temporary config failed before idle waiting because `Net::Server` could not bind: `Cannot bind and listen to TCP port 14949 on 127.0.0.1 [Operation not permitted]`.
## Review Pass 1
RESULT: ok
No source changes are present, `## Git Add Paths` correctly lists `None`, and the no-patch diagnosis is consistent with the evidence limits. The author checked the Perl entrypoint before the runtime, named the relevant Munin helpers/conventions, avoided overstating profiler-only evidence, and reported the project-level `make` blocker plus narrower syntax checks and blocked reproduction attempts.perl likely remains stuck in a busy-poll loop. A diagnosis report and patch proposal were created locally.
## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.
## Patch Pass
You are working on a bounded fixer proposal.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Produce the smallest reasonable patch for the target repository, keep the change upstreamable, prefer the clearest control flow available, and do not keep avoidable `goto` when a simpler structure would read better. Before introducing new file, process, allocation, locking, networking, or platform APIs, inspect nearby code and project contribution docs for existing helpers or compatibility wrappers and use those local patterns unless you can explain why they do not fit. Validate from a reproducible workspace-root entrypoint before falling back to focused leaf commands; if a build or test cannot run, report the exact command, the exact blocker, and any narrower check you ran instead. During validation, also try one bounded independent reproduction of the collected failure signal when it is safe and cheap, such as a failing test, smoke command, perf/strace comparison, or before/after runtime check. Only use `reproduced` if that command or test actually reproduced the failure; otherwise keep `observed` and report the reproduction blocker. The final explanation must connect the observed issue evidence to the actual code change, not just paraphrase the diff. Write like a maintainer is going to read the patch mail cold: explain the bug in plain language, define subsystem-specific jargon the first time you need it, and make the causal story obvious. Explicitly classify evidence confidence as `reproduced`, `observed`, or `inferred`: `reproduced` means you reproduced the failure locally; `observed` means Fixer has direct crash/log/trace evidence but you did not independently reproduce it; `inferred` means the source patch is not pull-request-ready, so do not leave a source diff unless you first gather stronger observed/reproduced evidence; otherwise return a no-patch diagnosis/report. For any source-changing `observed` patch, say explicitly in `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. Security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior need reproduced evidence plus explicit security-impact analysis before leaving a source diff; otherwise return a no-patch diagnosis/report for human review. If you introduce non-obvious state translation, index remapping, or backend split logic, add a short source comment that explains the invariant being preserved.
Start by explaining the likely root cause from the collected perf, strace, and /proc evidence. If you cannot land a safe patch, leave a diagnosis that is strong enough for an upstream bug report.
Interpreter process expectation: when the hot process is Python, Perl, shell, Node, Ruby, PHP, Lua, or another interpreter, inspect both the runtime and the script/application entrypoint from `details.interpreter_process`. Prefer the script or application package when evidence points there; do not patch the interpreter runtime merely because the hot binary is `python`, `perl`, `bash`, or similar. Runtime fixes are welcome only after checking the entrypoint and explaining why the runtime mishandles the workload or why running bad code faster/safer is itself the right upstream fix.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Keep the change narrowly scoped and summarize validation clearly.
In every authoring pass, your final response must start with `Subject: <single-line git commit subject>` and then include these markdown sections exactly:
## Commit Message
A short upstream-friendly explanation of what changed and why. Write it in plain language that a maintainer can follow without local complaint context. If you use subsystem jargon, define it immediately.
## Evidence Confidence
Exactly one word: `reproduced`, `observed`, or `inferred`. Use `reproduced` only when you reproduced the failure locally with a command or test, and include that command/test in `## Validation`. Use `observed` when Fixer has direct crash/log/trace evidence but you did not independently reproduce it. If `## Git Add Paths` lists source files for an `observed` patch, `## Issue Connection` must explicitly say the failure was observed by Fixer and not independently reproduced. Security-sensitive source changes touching authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior require reproduced evidence and explicit security-impact analysis; otherwise list `None` under `## Git Add Paths` and write a no-patch diagnosis/report. Use `inferred` for profiler/strace/indirect evidence; inferred responses may be no-patch diagnoses or reports, but inferred source patches are not pull-request-ready until stronger evidence is gathered.
## Issue Connection
Write this as maintainer-facing patch mail, not as local Fixer notes. Cover four things explicitly in readable sentences: the user-visible symptom or the exact collected signal, the code-level cause or the cautious inference from evidence, the specific change you made, and the expected effect. Do not invent a reproducer, command line, crash, or user-visible failure that is not present in the evidence bundle. If the evidence is direct-but-not-reproduced, say it was observed by Fixer and not independently reproduced. If the evidence is indirect and you did not gather stronger evidence, do not leave a source diff; write a no-patch diagnosis/report instead. Include an explicit effect sentence such as `The expected effect is ...`, `This should reduce ...`, or `This prevents ...` for source patches. If the logic is non-obvious in code, mention that you added a short explanatory comment.
## Git Add Paths
List the repo-relative paths that belong in the final patch, one per line. Use `None` only when you intentionally made no source changes. Include intentionally new files, and do not list generated build artifacts.
## Validation
List the checks you ran, or say clearly that you could not run them. Include the independent reproduction command/test and result when `## Evidence Confidence` is `reproduced`; if reproduction was attempted but blocked, name the exact blocker and keep confidence at `observed` or `inferred`.
Before editing, read the plan at `./plan-output.txt` and follow it unless the code proves part of it wrong. If you change course, say so explicitly in the final write-up instead of silently drifting from the plan.
## Review Pass 1
You are reviewing a freshly generated fixer patch.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Review the first patch pass. The original pre-edit snapshot is available at `./source` for diffing.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout. The latest author response is at `./patch-output.txt`. Inspect the current code and changed paths like a strict code reviewer. Focus on correctness, regressions, maintainability, awkward control flow such as avoidable `goto`, missing validation, weak or non-gittable commit message text, and explanations that fail to connect the observed issue evidence to the code change. Also review the maintainer experience: the patch mail should be easy to accept upstream, the user-visible bug should be explained in plain language, subsystem-specific jargon should be defined when first used, and any non-obvious state translation or index remapping in code should have a short explanatory comment. Reject patches that omit `## Evidence Confidence`, use anything other than `reproduced`, `observed`, or `inferred`, or sound more certain than that evidence level allows. Reject patches that claim `reproduced` unless `## Validation` names the concrete reproduction command or test and its result. Reject source patches in security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior unless the author reproduced the behavior and explicitly analyzed the security impact of the change; observed-only evidence should become a diagnosis/report, not a PR-ready source diff. Reject patches that invent a reproducer, command line, crash, or user-visible failure not present in the evidence bundle; indirect profiler or strace evidence may justify a cautious mitigation, but the author must say it is indirect instead of presenting it as a confirmed upstream bug. Reject patches that introduce generic libc/std APIs when nearby code or project docs provide a local compat/helper API for the same job, unless the author explicitly justifies the exception. Reject validation that only reports a leaf object/syntax build when a project-level configure/build/test entrypoint exists and was not attempted; if a full build cannot run, the author must show the exact failed command and blocker.
Do not apply code changes in this pass.
Return a short markdown review report. The first non-empty line must be exactly one of:
RESULT: ok
RESULT: fix-needed
If you choose `RESULT: fix-needed`, add a `## Findings` section with concrete, actionable items.## Plan Pass
## Problem
Fixer observed `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` in a poll-family syscall path, but the retained evidence does not prove a Munin busy loop. The embedded `strace` excerpt shows `pselect6(..., {tv_sec=1.813...})` and then `pselect6(..., {tv_sec=2})` timing out after multi-second waits, with process state `S (sleeping)` and max CPU `0.9%`. That looks more like normal `Net::Server::Fork` idle accept-loop behavior than runaway CPU.
## Evidence Confidence
observed
## Proposed Subject
No source patch: diagnose this as an unconfirmed runaway-process report for `munin-node` idle polling, and only patch later if an independent reproduction shows a true zero-timeout or near-zero-timeout spin tied to Munin code.
## Patch Plan
1. Do not edit files in this pass.
2. Treat `script/munin-node` as the entrypoint and `lib/Munin/Node/Server.pm` as the relevant subsystem, not Perl runtime internals.
3. Document that Munin uses `Net::Server::Fork` for the server loop, `Munin::Common::Timeout::do_with_timeout` for request/plugin timeouts, `Munin::Common::Logger` for logging, `Munin::Common::Daemon::emit_sd_notify_message` for readiness, and `Munin::Node::Service`/`Munin::Node::OS->run_as_child` for plugin execution. No local helper was found for replacing the inherited `Net::Server` idle `select`.
4. Note maintainer conventions from `CONTRIBUTING.md` and `HACKING.pod`: strict/warnings Perl, taint-mode awareness, present-tense imperative commits, no warnings, follow local file style.
5. If later evidence proves a Munin-side busy loop, patch the smallest bounded loop or timeout calculation in the implicated Munin module, using existing logging/timeout helpers and straightforward conditionals or early returns. Do not introduce avoidable `goto`.
6. No prior Fixer patch for this finding was found; existing Debian quilt patches are unrelated.
## Risks
A source patch based only on this evidence would likely change idle daemon behavior without a demonstrated bug. The evidence implicates authentication/TLS-adjacent server code only indirectly, so changing request-loop or TLS handling without reproduction would be security-sensitive and not pull-request-ready.
## Validation
Before any future patch is reported, try the project entrypoints from the workspace root: `make`, then `make test` because this tree has `test` rather than `check`. If those fail due to missing Perl build/test dependencies or generated files, record the exact command and failure.
For bounded independent reproduction, build enough to run the node, start `script/munin-node --foreground` with a minimal local config and empty plugin directory if dependencies allow, then capture `strace -ttT -f -e trace=pselect6,select,poll,ppoll` for a few seconds. A patch should only proceed if that shows repeated immediate returns or high CPU tied to Munin logic; the current evidence only shows observed sleeping `pselect6` timeouts.
## Patch Pass
Subject: No patch: diagnose munin-node idle poll evidence
## Commit Message
The likely root cause is an over-classified idle wait, not a proven Munin busy loop. Fixer saw `munin-node` under Perl in `pselect6`, but `/proc` showed the process sleeping, CPU was only `0.9%`, and the retained `strace` lines show 1.8-2.0 second blocking timeouts. No source change is left because the evidence does not identify a Munin loop that can be safely patched.
## Evidence Confidence
inferred
## Issue Connection
Fixer collected a profiler and syscall trace for `/usr/bin/perl -wT /usr/sbin/munin-node --foreground`: native frames were under Perl `select()`, the top syscall sequence was `pselect6`, and the kernel stack was in `poll_schedule_timeout`. The same evidence also shows `State: S (sleeping)`, max CPU of `0.9%`, and `pselect6` calls blocking for about two seconds, which is consistent with an idle `Net::Server::Fork` accept loop rather than a tight busy-poll loop.
I inspected the Perl entrypoint `script/munin-node` before considering the Perl runtime. The relevant server code is `lib/Munin/Node/Server.pm`, which delegates the listener loop to `Net::Server::Fork`; Munin’s own request path uses local helpers and conventions including `Munin::Common::Timeout::do_with_timeout`, `Munin::Common::Logger`, `Munin::Common::Daemon::emit_sd_notify_message`, and `Munin::Node::Service->fork_service`. I also checked the runtime enough to confirm this is Perl 5.40.1, but there is no evidence that Perl itself mishandled the workload.
I followed the saved no-patch plan. I changed only the confidence classification from the plan’s `observed` to `inferred` because the current authoring rules classify profiler/strace-only, not independently reproduced evidence as inferred when it does not support a pull-request-ready source patch. The expected effect is no behavioral change; an upstream report should ask for stronger evidence, such as a Perl-level stack or an attach/run trace showing immediate repeated `pselect6` returns with high CPU.
## Git Add Paths
None
## Validation
`make` from the workspace root failed before building:
`Can't locate Module/Build.pm in @INC ... at Build.PL line 80`, followed by `make: *** [Makefile:149: Build] Error 2`.
`make check` is not an available target in this tree; the project exposes `make test`, but it depends on the same `Build` generation blocked by missing `Module::Build`.
Narrow checks run:
`perl -Ilib -c lib/Munin/Node/Server.pm` passed.
`perl -T -Ilib -c script/munin-node` passed.
Independent reproduction attempts were blocked:
`strace -ttT -f -e trace=pselect6,select,poll,ppoll ... script/munin-node ...` failed with `PTRACE_TRACEME: Operation not permitted`.
A non-ptrace foreground smoke run with a temporary config failed before idle waiting because `Net::Server` could not bind: `Cannot bind and listen to TCP port 14949 on 127.0.0.1 [Operation not permitted]`.
## Review Pass 1
RESULT: ok
No source changes are present, `## Git Add Paths` correctly lists `None`, and the no-patch diagnosis is consistent with the evidence limits. The author checked the Perl entrypoint before the runtime, named the relevant Munin helpers/conventions, avoided overstating profiler-only evidence, and reported the project-level `make` blocker plus narrower syntax checks and blocked reproduction attempts.perl likely remains stuck in a busy-poll loop. A diagnosis report and patch proposal were created locally.
## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.
## Patch Pass
You are working on a bounded fixer proposal.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Produce the smallest reasonable patch for the target repository, keep the change upstreamable, prefer the clearest control flow available, and do not keep avoidable `goto` when a simpler structure would read better. Before introducing new file, process, allocation, locking, networking, or platform APIs, inspect nearby code and project contribution docs for existing helpers or compatibility wrappers and use those local patterns unless you can explain why they do not fit. Validate from a reproducible workspace-root entrypoint before falling back to focused leaf commands; if a build or test cannot run, report the exact command, the exact blocker, and any narrower check you ran instead. During validation, also try one bounded independent reproduction of the collected failure signal when it is safe and cheap, such as a failing test, smoke command, perf/strace comparison, or before/after runtime check. Only use `reproduced` if that command or test actually reproduced the failure; otherwise keep `observed` and report the reproduction blocker. The final explanation must connect the observed issue evidence to the actual code change, not just paraphrase the diff. Write like a maintainer is going to read the patch mail cold: explain the bug in plain language, define subsystem-specific jargon the first time you need it, and make the causal story obvious. Explicitly classify evidence confidence as `reproduced`, `observed`, or `inferred`: `reproduced` means you reproduced the failure locally; `observed` means Fixer has direct crash/log/trace evidence but you did not independently reproduce it; `inferred` means the source patch is not pull-request-ready, so do not leave a source diff unless you first gather stronger observed/reproduced evidence; otherwise return a no-patch diagnosis/report. For any source-changing `observed` patch, say explicitly in `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. Security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior need reproduced evidence plus explicit security-impact analysis before leaving a source diff; otherwise return a no-patch diagnosis/report for human review. If you introduce non-obvious state translation, index remapping, or backend split logic, add a short source comment that explains the invariant being preserved.
Start by explaining the likely root cause from the collected perf, strace, and /proc evidence. If you cannot land a safe patch, leave a diagnosis that is strong enough for an upstream bug report.
Interpreter process expectation: when the hot process is Python, Perl, shell, Node, Ruby, PHP, Lua, or another interpreter, inspect both the runtime and the script/application entrypoint from `details.interpreter_process`. Prefer the script or application package when evidence points there; do not patch the interpreter runtime merely because the hot binary is `python`, `perl`, `bash`, or similar. Runtime fixes are welcome only after checking the entrypoint and explaining why the runtime mishandles the workload or why running bad code faster/safer is itself the right upstream fix.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Keep the change narrowly scoped and summarize validation clearly.
In every authoring pass, your final response must start with `Subject: <single-line git commit subject>` and then include these markdown sections exactly:
## Commit Message
A short upstream-friendly explanation of what changed and why. Write it in plain language that a maintainer can follow without local complaint context. If you use subsystem jargon, define it immediately.
## Evidence Confidence
Exactly one word: `reproduced`, `observed`, or `inferred`. Use `reproduced` only when you reproduced the failure locally with a command or test, and include that command/test in `## Validation`. Use `observed` when Fixer has direct crash/log/trace evidence but you did not independently reproduce it. If `## Git Add Paths` lists source files for an `observed` patch, `## Issue Connection` must explicitly say the failure was observed by Fixer and not independently reproduced. Security-sensitive source changes touching authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior require reproduced evidence and explicit security-impact analysis; otherwise list `None` under `## Git Add Paths` and write a no-patch diagnosis/report. Use `inferred` for profiler/strace/indirect evidence; inferred responses may be no-patch diagnoses or reports, but inferred source patches are not pull-request-ready until stronger evidence is gathered.
## Issue Connection
Write this as maintainer-facing patch mail, not as local Fixer notes. Cover four things explicitly in readable sentences: the user-visible symptom or the exact collected signal, the code-level cause or the cautious inference from evidence, the specific change you made, and the expected effect. Do not invent a reproducer, command line, crash, or user-visible failure that is not present in the evidence bundle. If the evidence is direct-but-not-reproduced, say it was observed by Fixer and not independently reproduced. If the evidence is indirect and you did not gather stronger evidence, do not leave a source diff; write a no-patch diagnosis/report instead. Include an explicit effect sentence such as `The expected effect is ...`, `This should reduce ...`, or `This prevents ...` for source patches. If the logic is non-obvious in code, mention that you added a short explanatory comment.
## Git Add Paths
List the repo-relative paths that belong in the final patch, one per line. Use `None` only when you intentionally made no source changes. Include intentionally new files, and do not list generated build artifacts.
## Validation
List the checks you ran, or say clearly that you could not run them. Include the independent reproduction command/test and result when `## Evidence Confidence` is `reproduced`; if reproduction was attempted but blocked, name the exact blocker and keep confidence at `observed` or `inferred`.
Before editing, read the plan at `./plan-output.txt` and follow it unless the code proves part of it wrong. If you change course, say so explicitly in the final write-up instead of silently drifting from the plan.
## Review Pass 1
You are reviewing a freshly generated fixer patch.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Review the first patch pass. The original pre-edit snapshot is available at `./source` for diffing.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout. The latest author response is at `./patch-output.txt`. Inspect the current code and changed paths like a strict code reviewer. Focus on correctness, regressions, maintainability, awkward control flow such as avoidable `goto`, missing validation, weak or non-gittable commit message text, and explanations that fail to connect the observed issue evidence to the code change. Also review the maintainer experience: the patch mail should be easy to accept upstream, the user-visible bug should be explained in plain language, subsystem-specific jargon should be defined when first used, and any non-obvious state translation or index remapping in code should have a short explanatory comment. Reject patches that omit `## Evidence Confidence`, use anything other than `reproduced`, `observed`, or `inferred`, or sound more certain than that evidence level allows. Reject patches that claim `reproduced` unless `## Validation` names the concrete reproduction command or test and its result. Reject source patches in security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior unless the author reproduced the behavior and explicitly analyzed the security impact of the change; observed-only evidence should become a diagnosis/report, not a PR-ready source diff. Reject patches that invent a reproducer, command line, crash, or user-visible failure not present in the evidence bundle; indirect profiler or strace evidence may justify a cautious mitigation, but the author must say it is indirect instead of presenting it as a confirmed upstream bug. Reject patches that introduce generic libc/std APIs when nearby code or project docs provide a local compat/helper API for the same job, unless the author explicitly justifies the exception. Reject validation that only reports a leaf object/syntax build when a project-level configure/build/test entrypoint exists and was not attempted; if a full build cannot run, the author must show the exact failed command and blocker.
Do not apply code changes in this pass.
Return a short markdown review report. The first non-empty line must be exactly one of:
RESULT: ok
RESULT: fix-needed
If you choose `RESULT: fix-needed`, add a `## Findings` section with concrete, actionable items.## Plan Pass
## Problem
Fixer observed `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` in `pselect6`, but the retained evidence does not prove a Munin or Perl busy loop. The strace excerpt shows `pselect6` calls sleeping for about 1.8-2.0 seconds, process state `S (sleeping)`, and only `0.9%` CPU, which conflicts with a confirmed runaway CPU bug.
## Evidence Confidence
observed
## Proposed Subject
No source patch yet: diagnose the report as non-actionable with current evidence, and require a Perl-level stack or reproducible tight wakeup before changing Munin.
## Patch Plan
Do not edit Munin in this pass. The likely code path is [script/munin-node](./workspace/script/munin-node) calling [Munin::Node::Server](./workspace/lib/Munin/Node/Server.pm), which subclasses `Net::Server::Fork`; its idle accept loop plausibly explains the captured `select`.
Follow upstream conventions from `CONTRIBUTING.md` and `HACKING.pod`: strict/warnings Perl, one statement per line, present-tense imperative subject, and project tests via `make`/`Build.PL`. Relevant local helpers found are `Munin::Common::Timeout::do_with_timeout`, `Munin::Common::Daemon::emit_sd_notify_message`, and `Munin::Common::Logger`; no local helper was found that would replace the server accept loop.
No prior Fixer patch is present to improve or replace. Avoid adding awkward control flow such as `goto`; if later evidence proves a source bug, use a bounded, local change in the node server/request path with a targeted regression test.
## Risks
Changing idle polling, timeout, or daemon loop behavior without reproduction would be timing-sensitive and could affect service readiness, connection handling, or plugin execution. Current evidence is profiler-only/indirect and does not identify a failing script line or module call.
## Validation
Before any focused check, try from the workspace root:
`make`
If available, try `make check`; this tree appears to provide `make test` instead, so use:
`make test`
Bounded independent reproduction attempt before any future patch: run `munin-node` in foreground with a temporary empty servicedir under `timeout` and capture `strace -ttT -e pselect6,select,poll,ppoll` to verify whether wakeups are immediate or blocking. Do not claim `reproduced` unless that command shows a real tight loop.
## Patch Pass
Subject: Diagnose munin-node poll trace without source changes
## Commit Message
No source change is proposed. The collected evidence points at `munin-node` idling in its server accept loop, not at a confirmed runaway CPU bug. A patch changing daemon polling or timeout behavior would be timing-sensitive and is not justified without a local reproduction or a Perl-level stack tying the signal to Munin code.
## Evidence Confidence
inferred
## Issue Connection
Fixer collected a perf/strace signal for `/usr/bin/perl -wT /usr/sbin/munin-node --foreground`: native frames reached Perl and `select`, with `pselect6` as the dominant syscall. The same evidence also shows `munin-node` in `S (sleeping)`, `wchan` as `poll_schedule_timeout.constprop.0`, about `0.9%` CPU, and `pselect6` calls blocking for about 1.8-2.0 seconds.
The cautious code-level inference is that `script/munin-node` enters `Munin::Node::Server->run`, and `Munin::Node::Server` subclasses `Net::Server::Fork`; an idle server waiting for connections can naturally appear in `select`/`pselect6`. The Perl runtime frames are expected for an interpreted Perl daemon and do not prove a Perl runtime bug.
I followed the saved plan and left no source diff. I inspected `CONTRIBUTING.md`, `HACKING.pod`, the `munin-node` entrypoint, `Munin::Node::Server`, and local helpers including `Munin::Common::Timeout::do_with_timeout`, `Munin::Common::Daemon::emit_sd_notify_message`, and `Munin::Common::Logger`. No relevant local helper was found that would replace the `Net::Server::Fork` accept loop.
The expected effect is that this proposal avoids landing a speculative timing-sensitive change for profiler/strace-only evidence that could describe normal idle daemon behavior.
## Git Add Paths
None
## Validation
`make` failed from the workspace root because `Module::Build` is missing:
```text
Can't locate Module/Build.pm in @INC ... at Build.PL line 80.
make: *** [Makefile:149: Build] Error 2
```
`make check` failed because this tree has no `check` target:
```text
make: *** No rule to make target 'check'. Stop.
```
Focused checks run after the project entrypoint blocker:
```text
perl -Tc -Ilib script/munin-node
script/munin-node syntax OK
```
```text
perl -c -Ilib lib/Munin/Node/Server.pm
lib/Munin/Node/Server.pm syntax OK
```
Independent reproduction was attempted but blocked by the sandbox. `strace -ff -ttT -e trace=pselect6,select,poll,ppoll ... munin-node ...` failed with `PTRACE_TRACEME: Operation not permitted`. A non-ptrace smoke run of `munin-node` with a temporary empty servicedir also could not bind a local TCP port, failing with `Cannot bind and listen ... [Operation not permitted]`.
## Review Pass 1
RESULT: ok
No source changes are present, which matches the evidence limits. The author correctly treats the perf/strace signal as indirect, keeps `## Evidence Confidence` at `inferred`, and avoids a timing-sensitive daemon-loop patch without reproduced behavior.
Validation is acceptable for a no-patch diagnosis: `make` was attempted and blocked by missing `Module::Build`, `make check` was attempted and absent, narrow Perl syntax checks were run, and the independent reproduction attempt reports concrete sandbox blockers (`ptrace` and local bind not permitted). The explanation connects the observed `pselect6`/sleeping process evidence to the `munin-node`/`Net::Server::Fork` idle accept-loop inference without inventing a confirmed bug.perl likely remains stuck in a busy-poll loop. A diagnosis report and patch proposal were created locally.
## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.
## Patch Pass
You are working on a bounded fixer proposal.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Produce the smallest reasonable patch for the target repository, keep the change upstreamable, prefer the clearest control flow available, and do not keep avoidable `goto` when a simpler structure would read better. Before introducing new file, process, allocation, locking, networking, or platform APIs, inspect nearby code and project contribution docs for existing helpers or compatibility wrappers and use those local patterns unless you can explain why they do not fit. Validate from a reproducible workspace-root entrypoint before falling back to focused leaf commands; if a build or test cannot run, report the exact command, the exact blocker, and any narrower check you ran instead. During validation, also try one bounded independent reproduction of the collected failure signal when it is safe and cheap, such as a failing test, smoke command, perf/strace comparison, or before/after runtime check. Only use `reproduced` if that command or test actually reproduced the failure; otherwise keep `observed` and report the reproduction blocker. The final explanation must connect the observed issue evidence to the actual code change, not just paraphrase the diff. Write like a maintainer is going to read the patch mail cold: explain the bug in plain language, define subsystem-specific jargon the first time you need it, and make the causal story obvious. Explicitly classify evidence confidence as `reproduced`, `observed`, or `inferred`: `reproduced` means you reproduced the failure locally; `observed` means Fixer has direct crash/log/trace evidence but you did not independently reproduce it; `inferred` means the source patch is not pull-request-ready, so do not leave a source diff unless you first gather stronger observed/reproduced evidence; otherwise return a no-patch diagnosis/report. For any source-changing `observed` patch, say explicitly in `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. Security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior need reproduced evidence plus explicit security-impact analysis before leaving a source diff; otherwise return a no-patch diagnosis/report for human review. If you introduce non-obvious state translation, index remapping, or backend split logic, add a short source comment that explains the invariant being preserved.
Start by explaining the likely root cause from the collected perf, strace, and /proc evidence. If you cannot land a safe patch, leave a diagnosis that is strong enough for an upstream bug report.
Interpreter process expectation: when the hot process is Python, Perl, shell, Node, Ruby, PHP, Lua, or another interpreter, inspect both the runtime and the script/application entrypoint from `details.interpreter_process`. Prefer the script or application package when evidence points there; do not patch the interpreter runtime merely because the hot binary is `python`, `perl`, `bash`, or similar. Runtime fixes are welcome only after checking the entrypoint and explaining why the runtime mishandles the workload or why running bad code faster/safer is itself the right upstream fix.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Keep the change narrowly scoped and summarize validation clearly.
In every authoring pass, your final response must start with `Subject: <single-line git commit subject>` and then include these markdown sections exactly:
## Commit Message
A short upstream-friendly explanation of what changed and why. Write it in plain language that a maintainer can follow without local complaint context. If you use subsystem jargon, define it immediately.
## Evidence Confidence
Exactly one word: `reproduced`, `observed`, or `inferred`. Use `reproduced` only when you reproduced the failure locally with a command or test, and include that command/test in `## Validation`. Use `observed` when Fixer has direct crash/log/trace evidence but you did not independently reproduce it. If `## Git Add Paths` lists source files for an `observed` patch, `## Issue Connection` must explicitly say the failure was observed by Fixer and not independently reproduced. Security-sensitive source changes touching authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior require reproduced evidence and explicit security-impact analysis; otherwise list `None` under `## Git Add Paths` and write a no-patch diagnosis/report. Use `inferred` for profiler/strace/indirect evidence; inferred responses may be no-patch diagnoses or reports, but inferred source patches are not pull-request-ready until stronger evidence is gathered.
## Issue Connection
Write this as maintainer-facing patch mail, not as local Fixer notes. Cover four things explicitly in readable sentences: the user-visible symptom or the exact collected signal, the code-level cause or the cautious inference from evidence, the specific change you made, and the expected effect. Do not invent a reproducer, command line, crash, or user-visible failure that is not present in the evidence bundle. If the evidence is direct-but-not-reproduced, say it was observed by Fixer and not independently reproduced. If the evidence is indirect and you did not gather stronger evidence, do not leave a source diff; write a no-patch diagnosis/report instead. Include an explicit effect sentence such as `The expected effect is ...`, `This should reduce ...`, or `This prevents ...` for source patches. If the logic is non-obvious in code, mention that you added a short explanatory comment.
## Git Add Paths
List the repo-relative paths that belong in the final patch, one per line. Use `None` only when you intentionally made no source changes. Include intentionally new files, and do not list generated build artifacts.
## Validation
List the checks you ran, or say clearly that you could not run them. Include the independent reproduction command/test and result when `## Evidence Confidence` is `reproduced`; if reproduction was attempted but blocked, name the exact blocker and keep confidence at `observed` or `inferred`.
Before editing, read the plan at `./plan-output.txt` and follow it unless the code proves part of it wrong. If you change course, say so explicitly in the final write-up instead of silently drifting from the plan.
## Review Pass 1
You are reviewing a freshly generated fixer patch.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Review the first patch pass. The original pre-edit snapshot is available at `./source` for diffing.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout. The latest author response is at `./patch-output.txt`. Inspect the current code and changed paths like a strict code reviewer. Focus on correctness, regressions, maintainability, awkward control flow such as avoidable `goto`, missing validation, weak or non-gittable commit message text, and explanations that fail to connect the observed issue evidence to the code change. Also review the maintainer experience: the patch mail should be easy to accept upstream, the user-visible bug should be explained in plain language, subsystem-specific jargon should be defined when first used, and any non-obvious state translation or index remapping in code should have a short explanatory comment. Reject patches that omit `## Evidence Confidence`, use anything other than `reproduced`, `observed`, or `inferred`, or sound more certain than that evidence level allows. Reject patches that claim `reproduced` unless `## Validation` names the concrete reproduction command or test and its result. Reject source patches in security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior unless the author reproduced the behavior and explicitly analyzed the security impact of the change; observed-only evidence should become a diagnosis/report, not a PR-ready source diff. Reject patches that invent a reproducer, command line, crash, or user-visible failure not present in the evidence bundle; indirect profiler or strace evidence may justify a cautious mitigation, but the author must say it is indirect instead of presenting it as a confirmed upstream bug. Reject patches that introduce generic libc/std APIs when nearby code or project docs provide a local compat/helper API for the same job, unless the author explicitly justifies the exception. Reject validation that only reports a leaf object/syntax build when a project-level configure/build/test entrypoint exists and was not attempted; if a full build cannot run, the author must show the exact failed command and blocker.
Do not apply code changes in this pass.
Return a short markdown review report. The first non-empty line must be exactly one of:
RESULT: ok
RESULT: fix-needed
If you choose `RESULT: fix-needed`, add a `## Findings` section with concrete, actionable items.## Plan Pass
## Problem
Fixer observed `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` in `pselect6`, but the retained evidence does not prove a Munin or Perl busy loop. The strace excerpt shows `pselect6` calls sleeping for about 1.8-2.0 seconds, process state `S (sleeping)`, and only `0.9%` CPU, which conflicts with a confirmed runaway CPU bug.
## Evidence Confidence
observed
## Proposed Subject
No source patch yet: diagnose the report as non-actionable with current evidence, and require a Perl-level stack or reproducible tight wakeup before changing Munin.
## Patch Plan
Do not edit Munin in this pass. The likely code path is [script/munin-node](./workspace/script/munin-node) calling [Munin::Node::Server](./workspace/lib/Munin/Node/Server.pm), which subclasses `Net::Server::Fork`; its idle accept loop plausibly explains the captured `select`.
Follow upstream conventions from `CONTRIBUTING.md` and `HACKING.pod`: strict/warnings Perl, one statement per line, present-tense imperative subject, and project tests via `make`/`Build.PL`. Relevant local helpers found are `Munin::Common::Timeout::do_with_timeout`, `Munin::Common::Daemon::emit_sd_notify_message`, and `Munin::Common::Logger`; no local helper was found that would replace the server accept loop.
No prior Fixer patch is present to improve or replace. Avoid adding awkward control flow such as `goto`; if later evidence proves a source bug, use a bounded, local change in the node server/request path with a targeted regression test.
## Risks
Changing idle polling, timeout, or daemon loop behavior without reproduction would be timing-sensitive and could affect service readiness, connection handling, or plugin execution. Current evidence is profiler-only/indirect and does not identify a failing script line or module call.
## Validation
Before any focused check, try from the workspace root:
`make`
If available, try `make check`; this tree appears to provide `make test` instead, so use:
`make test`
Bounded independent reproduction attempt before any future patch: run `munin-node` in foreground with a temporary empty servicedir under `timeout` and capture `strace -ttT -e pselect6,select,poll,ppoll` to verify whether wakeups are immediate or blocking. Do not claim `reproduced` unless that command shows a real tight loop.
## Patch Pass
Subject: Diagnose munin-node poll trace without source changes
## Commit Message
No source change is proposed. The collected evidence points at `munin-node` idling in its server accept loop, not at a confirmed runaway CPU bug. A patch changing daemon polling or timeout behavior would be timing-sensitive and is not justified without a local reproduction or a Perl-level stack tying the signal to Munin code.
## Evidence Confidence
inferred
## Issue Connection
Fixer collected a perf/strace signal for `/usr/bin/perl -wT /usr/sbin/munin-node --foreground`: native frames reached Perl and `select`, with `pselect6` as the dominant syscall. The same evidence also shows `munin-node` in `S (sleeping)`, `wchan` as `poll_schedule_timeout.constprop.0`, about `0.9%` CPU, and `pselect6` calls blocking for about 1.8-2.0 seconds.
The cautious code-level inference is that `script/munin-node` enters `Munin::Node::Server->run`, and `Munin::Node::Server` subclasses `Net::Server::Fork`; an idle server waiting for connections can naturally appear in `select`/`pselect6`. The Perl runtime frames are expected for an interpreted Perl daemon and do not prove a Perl runtime bug.
I followed the saved plan and left no source diff. I inspected `CONTRIBUTING.md`, `HACKING.pod`, the `munin-node` entrypoint, `Munin::Node::Server`, and local helpers including `Munin::Common::Timeout::do_with_timeout`, `Munin::Common::Daemon::emit_sd_notify_message`, and `Munin::Common::Logger`. No relevant local helper was found that would replace the `Net::Server::Fork` accept loop.
The expected effect is that this proposal avoids landing a speculative timing-sensitive change for profiler/strace-only evidence that could describe normal idle daemon behavior.
## Git Add Paths
None
## Validation
`make` failed from the workspace root because `Module::Build` is missing:
```text
Can't locate Module/Build.pm in @INC ... at Build.PL line 80.
make: *** [Makefile:149: Build] Error 2
```
`make check` failed because this tree has no `check` target:
```text
make: *** No rule to make target 'check'. Stop.
```
Focused checks run after the project entrypoint blocker:
```text
perl -Tc -Ilib script/munin-node
script/munin-node syntax OK
```
```text
perl -c -Ilib lib/Munin/Node/Server.pm
lib/Munin/Node/Server.pm syntax OK
```
Independent reproduction was attempted but blocked by the sandbox. `strace -ff -ttT -e trace=pselect6,select,poll,ppoll ... munin-node ...` failed with `PTRACE_TRACEME: Operation not permitted`. A non-ptrace smoke run of `munin-node` with a temporary empty servicedir also could not bind a local TCP port, failing with `Cannot bind and listen ... [Operation not permitted]`.
## Review Pass 1
RESULT: ok
No source changes are present, which matches the evidence limits. The author correctly treats the perf/strace signal as indirect, keeps `## Evidence Confidence` at `inferred`, and avoids a timing-sensitive daemon-loop patch without reproduced behavior.
Validation is acceptable for a no-patch diagnosis: `make` was attempted and blocked by missing `Module::Build`, `make check` was attempted and absent, narrow Perl syntax checks were run, and the independent reproduction attempt reports concrete sandbox blockers (`ptrace` and local bind not permitted). The explanation connects the observed `pselect6`/sleeping process evidence to the `munin-node`/`Net::Server::Fork` idle accept-loop inference without inventing a confirmed bug.perl likely remains stuck in a busy-poll loop. A diagnosis report and patch proposal were created locally.
## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.
## Patch Pass
You are working on a bounded fixer proposal.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Produce the smallest reasonable patch for the target repository, keep the change upstreamable, prefer the clearest control flow available, and do not keep avoidable `goto` when a simpler structure would read better. Before introducing new file, process, allocation, locking, networking, or platform APIs, inspect nearby code and project contribution docs for existing helpers or compatibility wrappers and use those local patterns unless you can explain why they do not fit. Validate from a reproducible workspace-root entrypoint before falling back to focused leaf commands; if a build or test cannot run, report the exact command, the exact blocker, and any narrower check you ran instead. During validation, also try one bounded independent reproduction of the collected failure signal when it is safe and cheap, such as a failing test, smoke command, perf/strace comparison, or before/after runtime check. Only use `reproduced` if that command or test actually reproduced the failure; otherwise keep `observed` and report the reproduction blocker. The final explanation must connect the observed issue evidence to the actual code change, not just paraphrase the diff. Write like a maintainer is going to read the patch mail cold: explain the bug in plain language, define subsystem-specific jargon the first time you need it, and make the causal story obvious. Explicitly classify evidence confidence as `reproduced`, `observed`, or `inferred`: `reproduced` means you reproduced the failure locally; `observed` means Fixer has direct crash/log/trace evidence but you did not independently reproduce it; `inferred` means the source patch is not pull-request-ready, so do not leave a source diff unless you first gather stronger observed/reproduced evidence; otherwise return a no-patch diagnosis/report. For any source-changing `observed` patch, say explicitly in `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. Security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior need reproduced evidence plus explicit security-impact analysis before leaving a source diff; otherwise return a no-patch diagnosis/report for human review. If you introduce non-obvious state translation, index remapping, or backend split logic, add a short source comment that explains the invariant being preserved.
Start by explaining the likely root cause from the collected perf, strace, and /proc evidence. If you cannot land a safe patch, leave a diagnosis that is strong enough for an upstream bug report.
Interpreter process expectation: when the hot process is Python, Perl, shell, Node, Ruby, PHP, Lua, or another interpreter, inspect both the runtime and the script/application entrypoint from `details.interpreter_process`. Prefer the script or application package when evidence points there; do not patch the interpreter runtime merely because the hot binary is `python`, `perl`, `bash`, or similar. Runtime fixes are welcome only after checking the entrypoint and explaining why the runtime mishandles the workload or why running bad code faster/safer is itself the right upstream fix.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Keep the change narrowly scoped and summarize validation clearly.
In every authoring pass, your final response must start with `Subject: <single-line git commit subject>` and then include these markdown sections exactly:
## Commit Message
A short upstream-friendly explanation of what changed and why. Write it in plain language that a maintainer can follow without local complaint context. If you use subsystem jargon, define it immediately.
## Evidence Confidence
Exactly one word: `reproduced`, `observed`, or `inferred`. Use `reproduced` only when you reproduced the failure locally with a command or test, and include that command/test in `## Validation`. Use `observed` when Fixer has direct crash/log/trace evidence but you did not independently reproduce it. If `## Git Add Paths` lists source files for an `observed` patch, `## Issue Connection` must explicitly say the failure was observed by Fixer and not independently reproduced. Security-sensitive source changes touching authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior require reproduced evidence and explicit security-impact analysis; otherwise list `None` under `## Git Add Paths` and write a no-patch diagnosis/report. Use `inferred` for profiler/strace/indirect evidence; inferred responses may be no-patch diagnoses or reports, but inferred source patches are not pull-request-ready until stronger evidence is gathered.
## Issue Connection
Write this as maintainer-facing patch mail, not as local Fixer notes. Cover four things explicitly in readable sentences: the user-visible symptom or the exact collected signal, the code-level cause or the cautious inference from evidence, the specific change you made, and the expected effect. Do not invent a reproducer, command line, crash, or user-visible failure that is not present in the evidence bundle. If the evidence is direct-but-not-reproduced, say it was observed by Fixer and not independently reproduced. If the evidence is indirect and you did not gather stronger evidence, do not leave a source diff; write a no-patch diagnosis/report instead. Include an explicit effect sentence such as `The expected effect is ...`, `This should reduce ...`, or `This prevents ...` for source patches. If the logic is non-obvious in code, mention that you added a short explanatory comment.
## Git Add Paths
List the repo-relative paths that belong in the final patch, one per line. Use `None` only when you intentionally made no source changes. Include intentionally new files, and do not list generated build artifacts.
## Validation
List the checks you ran, or say clearly that you could not run them. Include the independent reproduction command/test and result when `## Evidence Confidence` is `reproduced`; if reproduction was attempted but blocked, name the exact blocker and keep confidence at `observed` or `inferred`.
Before editing, read the plan at `./plan-output.txt` and follow it unless the code proves part of it wrong. If you change course, say so explicitly in the final write-up instead of silently drifting from the plan.
## Review Pass 1
You are reviewing a freshly generated fixer patch.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Review the first patch pass. The original pre-edit snapshot is available at `./source` for diffing.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout. The latest author response is at `./patch-output.txt`. Inspect the current code and changed paths like a strict code reviewer. Focus on correctness, regressions, maintainability, awkward control flow such as avoidable `goto`, missing validation, weak or non-gittable commit message text, and explanations that fail to connect the observed issue evidence to the code change. Also review the maintainer experience: the patch mail should be easy to accept upstream, the user-visible bug should be explained in plain language, subsystem-specific jargon should be defined when first used, and any non-obvious state translation or index remapping in code should have a short explanatory comment. Reject patches that omit `## Evidence Confidence`, use anything other than `reproduced`, `observed`, or `inferred`, or sound more certain than that evidence level allows. Reject patches that claim `reproduced` unless `## Validation` names the concrete reproduction command or test and its result. Reject source patches in security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior unless the author reproduced the behavior and explicitly analyzed the security impact of the change; observed-only evidence should become a diagnosis/report, not a PR-ready source diff. Reject patches that invent a reproducer, command line, crash, or user-visible failure not present in the evidence bundle; indirect profiler or strace evidence may justify a cautious mitigation, but the author must say it is indirect instead of presenting it as a confirmed upstream bug. Reject patches that introduce generic libc/std APIs when nearby code or project docs provide a local compat/helper API for the same job, unless the author explicitly justifies the exception. Reject validation that only reports a leaf object/syntax build when a project-level configure/build/test entrypoint exists and was not attempted; if a full build cannot run, the author must show the exact failed command and blocker.
Do not apply code changes in this pass.
Return a short markdown review report. The first non-empty line must be exactly one of:
RESULT: ok
RESULT: fix-needed
If you choose `RESULT: fix-needed`, add a `## Findings` section with concrete, actionable items.## Plan Pass
## Problem
Fixer observed `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` in a repeated `pselect6` path, but the retained signal is profiler/syscall evidence only. The captured `strace` shows ~1.8s and ~2.0s `pselect6` timeouts, process state `S (sleeping)`, and only ~0.9% CPU, so this does not yet establish a runaway `munin-node` source bug.
## Evidence Confidence
inferred
## Proposed Subject
No source patch yet: diagnose `munin-node` idle `Net::Server::Fork` select wakeups before changing upstream code.
## Patch Plan
Do not edit in this pass unless a bounded reproduction ties the wakeup pattern to Munin application logic with harmful CPU behavior. The relevant entrypoint is `script/munin-node`, which calls `Munin::Node::Server->run`; `Munin::Node::Server` subclasses `Net::Server::Fork`. The observed 2-second `pselect6` cadence matches `Net::Server::Fork`’s accept loop using `can_read(2)`, so a Munin patch would currently be speculative.
Follow upstream conventions from `CONTRIBUTING.md` and `HACKING.pod`: taint-mode Perl, `strict`/`warnings`, existing indentation style, clear English variable names via `English`, and project tests via `perl Build.PL && ./Build test` when feasible. Relevant local helpers found: `Munin::Common::Logger` for logging, `Munin::Common::Timeout::do_with_timeout` for bounded work, and `Munin::Node::OS` helpers for plugin child handling. No Munin-local event-loop wrapper was found; listener behavior comes from `Net::Server::Fork`.
No prior Fixer patch for this issue was found in `.pc` or `debian/patches`. If later evidence proves a Munin bug, prefer a small, straight-line change in `script/munin-node` or `lib/Munin/Node/Server.pm`; avoid awkward control flow such as avoidable `goto`.
## Risks
Patching now could turn a normal daemon idle wakeup into a behavioral regression, especially around signal handling, HUP reloads, foreground/systemd readiness, or connection acceptance. This area also touches network daemon availability, so changing accept-loop timing without reproduction would be unsafe.
## Validation
First try project-level entrypoints from the workspace root: `make`, then `make check` if available. If those fail due to missing generated files or dependencies, record the exact command and failure, then run the narrowest reproducible checks such as `perl -Ilib -c script/munin-node` and relevant module compiles.
Bounded independent reproduction attempt before any patch: run `munin-node` from the workspace with a temporary minimal config under `timeout`, trace `pselect6/select/poll`, and verify whether idle behavior is just `Net::Server::Fork` sleeping in `can_read(2)` with low CPU. Only claim `reproduced` if that command shows the reported harmful loop, not merely normal 2-second idle wakeups.
## Patch Pass
Subject: Diagnose munin-node idle select wakeups
## Commit Message
No source change is included. The collected signal points at `munin-node` idling in the `Net::Server::Fork` accept loop, where `can_read(2)` waits up to two seconds for an incoming connection. That matches the captured `pselect6` timeouts and does not establish a Munin source bug.
## Evidence Confidence
inferred
## Issue Connection
Fixer observed `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` with native frames under `select()` and three `pselect6` calls over five seconds. The same evidence says the process was `S (sleeping)`, blocked in `poll_schedule_timeout`, and using only about `0.9%` CPU.
The likely root cause is normal idle daemon behavior, not a confirmed runaway loop: `script/munin-node` runs `Munin::Node::Server`, which subclasses `Net::Server::Fork`; that runtime’s accept path waits with `can_read(2)`, matching the two-second timeout cadence in the trace. The evidence did not include a Perl-level stack or a reproduced high-CPU condition tying the samples to a Munin application bug.
I followed the saved plan and left no source diff. `CONTRIBUTING.md` and `HACKING.pod` call for taint-mode Perl, `strict`/`warnings`, and existing style. Relevant local helpers found were `Munin::Common::Logger`, `Munin::Common::Timeout::do_with_timeout`, and `Munin::Node::OS` child-process helpers, but no Munin-local event-loop wrapper was found; listener behavior comes from `Net::Server::Fork`.
The expected effect is no behavioral change. This is a no-patch diagnosis suitable for an upstream report asking for stronger evidence, such as a Perl-level stack or a reproducible high-CPU idle case, before changing daemon accept-loop behavior.
## Git Add Paths
None
## Validation
`make` failed from the workspace root before tests could run: `Can't locate Module/Build.pm in @INC ... at Build.PL line 80`, followed by `make: *** [Makefile:149: Build] Error 2`.
`make check` failed because this tree has no such target: `make: *** No rule to make target 'check'. Stop.`
Focused checks:
`perl -T -Ilib -c script/munin-node` passed.
`perl -Ilib -c lib/Munin/Node/Server.pm` passed.
Independent reproduction attempt:
`strace -ttT -f -e trace=pselect6,select,poll,ppoll,epoll_wait,nanosleep,clock_nanosleep ... munin-node --foreground ...` was blocked by sandbox ptrace restrictions: `PTRACE_TRACEME: Operation not permitted`.
A non-ptrace smoke run with a temporary `munin-node.conf` was also blocked before idle behavior could be observed because the sandbox does not permit binding a TCP listener: `Cannot bind and listen to TCP port 49499 on 127.0.0.1 [Operation not permitted]`.
## Review Pass 1
RESULT: ok
No blocking findings. The workspace has no source diff, and the author correctly treated the profiler/strace evidence as `inferred` rather than leaving a speculative source patch.
The report is consistent with the evidence bundle: `munin-node` was sampled under `select()`/`pselect6`, but `/proc` showed `S (sleeping)`, `poll_schedule_timeout`, and low CPU. The explanation ties that signal to `script/munin-node` using `Munin::Node::Server` and the inherited `Net::Server::Fork` `can_read(2)` accept loop.
Validation is acceptable for a no-patch diagnosis: project-level `make` and `make check` were attempted with exact blockers, focused Perl syntax checks were run, and the bounded reproduction attempts report concrete sandbox blockers.perl likely remains stuck in a busy-poll loop. A diagnosis report and patch proposal were created locally.
## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.
## Patch Pass
You are working on a bounded fixer proposal.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Produce the smallest reasonable patch for the target repository, keep the change upstreamable, prefer the clearest control flow available, and do not keep avoidable `goto` when a simpler structure would read better. Before introducing new file, process, allocation, locking, networking, or platform APIs, inspect nearby code and project contribution docs for existing helpers or compatibility wrappers and use those local patterns unless you can explain why they do not fit. Validate from a reproducible workspace-root entrypoint before falling back to focused leaf commands; if a build or test cannot run, report the exact command, the exact blocker, and any narrower check you ran instead. During validation, also try one bounded independent reproduction of the collected failure signal when it is safe and cheap, such as a failing test, smoke command, perf/strace comparison, or before/after runtime check. Only use `reproduced` if that command or test actually reproduced the failure; otherwise keep `observed` and report the reproduction blocker. The final explanation must connect the observed issue evidence to the actual code change, not just paraphrase the diff. Write like a maintainer is going to read the patch mail cold: explain the bug in plain language, define subsystem-specific jargon the first time you need it, and make the causal story obvious. Explicitly classify evidence confidence as `reproduced`, `observed`, or `inferred`: `reproduced` means you reproduced the failure locally; `observed` means Fixer has direct crash/log/trace evidence but you did not independently reproduce it; `inferred` means the source patch is not pull-request-ready, so do not leave a source diff unless you first gather stronger observed/reproduced evidence; otherwise return a no-patch diagnosis/report. For any source-changing `observed` patch, say explicitly in `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. Security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior need reproduced evidence plus explicit security-impact analysis before leaving a source diff; otherwise return a no-patch diagnosis/report for human review. If you introduce non-obvious state translation, index remapping, or backend split logic, add a short source comment that explains the invariant being preserved.
Start by explaining the likely root cause from the collected perf, strace, and /proc evidence. If you cannot land a safe patch, leave a diagnosis that is strong enough for an upstream bug report.
Interpreter process expectation: when the hot process is Python, Perl, shell, Node, Ruby, PHP, Lua, or another interpreter, inspect both the runtime and the script/application entrypoint from `details.interpreter_process`. Prefer the script or application package when evidence points there; do not patch the interpreter runtime merely because the hot binary is `python`, `perl`, `bash`, or similar. Runtime fixes are welcome only after checking the entrypoint and explaining why the runtime mishandles the workload or why running bad code faster/safer is itself the right upstream fix.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Keep the change narrowly scoped and summarize validation clearly.
In every authoring pass, your final response must start with `Subject: <single-line git commit subject>` and then include these markdown sections exactly:
## Commit Message
A short upstream-friendly explanation of what changed and why. Write it in plain language that a maintainer can follow without local complaint context. If you use subsystem jargon, define it immediately.
## Evidence Confidence
Exactly one word: `reproduced`, `observed`, or `inferred`. Use `reproduced` only when you reproduced the failure locally with a command or test, and include that command/test in `## Validation`. Use `observed` when Fixer has direct crash/log/trace evidence but you did not independently reproduce it. If `## Git Add Paths` lists source files for an `observed` patch, `## Issue Connection` must explicitly say the failure was observed by Fixer and not independently reproduced. Security-sensitive source changes touching authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior require reproduced evidence and explicit security-impact analysis; otherwise list `None` under `## Git Add Paths` and write a no-patch diagnosis/report. Use `inferred` for profiler/strace/indirect evidence; inferred responses may be no-patch diagnoses or reports, but inferred source patches are not pull-request-ready until stronger evidence is gathered.
## Issue Connection
Write this as maintainer-facing patch mail, not as local Fixer notes. Cover four things explicitly in readable sentences: the user-visible symptom or the exact collected signal, the code-level cause or the cautious inference from evidence, the specific change you made, and the expected effect. Do not invent a reproducer, command line, crash, or user-visible failure that is not present in the evidence bundle. If the evidence is direct-but-not-reproduced, say it was observed by Fixer and not independently reproduced. If the evidence is indirect and you did not gather stronger evidence, do not leave a source diff; write a no-patch diagnosis/report instead. Include an explicit effect sentence such as `The expected effect is ...`, `This should reduce ...`, or `This prevents ...` for source patches. If the logic is non-obvious in code, mention that you added a short explanatory comment.
## Git Add Paths
List the repo-relative paths that belong in the final patch, one per line. Use `None` only when you intentionally made no source changes. Include intentionally new files, and do not list generated build artifacts.
## Validation
List the checks you ran, or say clearly that you could not run them. Include the independent reproduction command/test and result when `## Evidence Confidence` is `reproduced`; if reproduction was attempted but blocked, name the exact blocker and keep confidence at `observed` or `inferred`.
Before editing, read the plan at `./plan-output.txt` and follow it unless the code proves part of it wrong. If you change course, say so explicitly in the final write-up instead of silently drifting from the plan.
## Review Pass 1
You are reviewing a freshly generated fixer patch.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Review the first patch pass. The original pre-edit snapshot is available at `./source` for diffing.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout. The latest author response is at `./patch-output.txt`. Inspect the current code and changed paths like a strict code reviewer. Focus on correctness, regressions, maintainability, awkward control flow such as avoidable `goto`, missing validation, weak or non-gittable commit message text, and explanations that fail to connect the observed issue evidence to the code change. Also review the maintainer experience: the patch mail should be easy to accept upstream, the user-visible bug should be explained in plain language, subsystem-specific jargon should be defined when first used, and any non-obvious state translation or index remapping in code should have a short explanatory comment. Reject patches that omit `## Evidence Confidence`, use anything other than `reproduced`, `observed`, or `inferred`, or sound more certain than that evidence level allows. Reject patches that claim `reproduced` unless `## Validation` names the concrete reproduction command or test and its result. Reject source patches in security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior unless the author reproduced the behavior and explicitly analyzed the security impact of the change; observed-only evidence should become a diagnosis/report, not a PR-ready source diff. Reject patches that invent a reproducer, command line, crash, or user-visible failure not present in the evidence bundle; indirect profiler or strace evidence may justify a cautious mitigation, but the author must say it is indirect instead of presenting it as a confirmed upstream bug. Reject patches that introduce generic libc/std APIs when nearby code or project docs provide a local compat/helper API for the same job, unless the author explicitly justifies the exception. Reject validation that only reports a leaf object/syntax build when a project-level configure/build/test entrypoint exists and was not attempted; if a full build cannot run, the author must show the exact failed command and blocker.
Do not apply code changes in this pass.
Return a short markdown review report. The first non-empty line must be exactly one of:
RESULT: ok
RESULT: fix-needed
If you choose `RESULT: fix-needed`, add a `## Findings` section with concrete, actionable items.## Plan Pass
## Problem
Fixer observed `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` in a repeated `pselect6` path, but the retained signal is profiler/syscall evidence only. The captured `strace` shows ~1.8s and ~2.0s `pselect6` timeouts, process state `S (sleeping)`, and only ~0.9% CPU, so this does not yet establish a runaway `munin-node` source bug.
## Evidence Confidence
inferred
## Proposed Subject
No source patch yet: diagnose `munin-node` idle `Net::Server::Fork` select wakeups before changing upstream code.
## Patch Plan
Do not edit in this pass unless a bounded reproduction ties the wakeup pattern to Munin application logic with harmful CPU behavior. The relevant entrypoint is `script/munin-node`, which calls `Munin::Node::Server->run`; `Munin::Node::Server` subclasses `Net::Server::Fork`. The observed 2-second `pselect6` cadence matches `Net::Server::Fork`’s accept loop using `can_read(2)`, so a Munin patch would currently be speculative.
Follow upstream conventions from `CONTRIBUTING.md` and `HACKING.pod`: taint-mode Perl, `strict`/`warnings`, existing indentation style, clear English variable names via `English`, and project tests via `perl Build.PL && ./Build test` when feasible. Relevant local helpers found: `Munin::Common::Logger` for logging, `Munin::Common::Timeout::do_with_timeout` for bounded work, and `Munin::Node::OS` helpers for plugin child handling. No Munin-local event-loop wrapper was found; listener behavior comes from `Net::Server::Fork`.
No prior Fixer patch for this issue was found in `.pc` or `debian/patches`. If later evidence proves a Munin bug, prefer a small, straight-line change in `script/munin-node` or `lib/Munin/Node/Server.pm`; avoid awkward control flow such as avoidable `goto`.
## Risks
Patching now could turn a normal daemon idle wakeup into a behavioral regression, especially around signal handling, HUP reloads, foreground/systemd readiness, or connection acceptance. This area also touches network daemon availability, so changing accept-loop timing without reproduction would be unsafe.
## Validation
First try project-level entrypoints from the workspace root: `make`, then `make check` if available. If those fail due to missing generated files or dependencies, record the exact command and failure, then run the narrowest reproducible checks such as `perl -Ilib -c script/munin-node` and relevant module compiles.
Bounded independent reproduction attempt before any patch: run `munin-node` from the workspace with a temporary minimal config under `timeout`, trace `pselect6/select/poll`, and verify whether idle behavior is just `Net::Server::Fork` sleeping in `can_read(2)` with low CPU. Only claim `reproduced` if that command shows the reported harmful loop, not merely normal 2-second idle wakeups.
## Patch Pass
Subject: Diagnose munin-node idle select wakeups
## Commit Message
No source change is included. The collected signal points at `munin-node` idling in the `Net::Server::Fork` accept loop, where `can_read(2)` waits up to two seconds for an incoming connection. That matches the captured `pselect6` timeouts and does not establish a Munin source bug.
## Evidence Confidence
inferred
## Issue Connection
Fixer observed `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` with native frames under `select()` and three `pselect6` calls over five seconds. The same evidence says the process was `S (sleeping)`, blocked in `poll_schedule_timeout`, and using only about `0.9%` CPU.
The likely root cause is normal idle daemon behavior, not a confirmed runaway loop: `script/munin-node` runs `Munin::Node::Server`, which subclasses `Net::Server::Fork`; that runtime’s accept path waits with `can_read(2)`, matching the two-second timeout cadence in the trace. The evidence did not include a Perl-level stack or a reproduced high-CPU condition tying the samples to a Munin application bug.
I followed the saved plan and left no source diff. `CONTRIBUTING.md` and `HACKING.pod` call for taint-mode Perl, `strict`/`warnings`, and existing style. Relevant local helpers found were `Munin::Common::Logger`, `Munin::Common::Timeout::do_with_timeout`, and `Munin::Node::OS` child-process helpers, but no Munin-local event-loop wrapper was found; listener behavior comes from `Net::Server::Fork`.
The expected effect is no behavioral change. This is a no-patch diagnosis suitable for an upstream report asking for stronger evidence, such as a Perl-level stack or a reproducible high-CPU idle case, before changing daemon accept-loop behavior.
## Git Add Paths
None
## Validation
`make` failed from the workspace root before tests could run: `Can't locate Module/Build.pm in @INC ... at Build.PL line 80`, followed by `make: *** [Makefile:149: Build] Error 2`.
`make check` failed because this tree has no such target: `make: *** No rule to make target 'check'. Stop.`
Focused checks:
`perl -T -Ilib -c script/munin-node` passed.
`perl -Ilib -c lib/Munin/Node/Server.pm` passed.
Independent reproduction attempt:
`strace -ttT -f -e trace=pselect6,select,poll,ppoll,epoll_wait,nanosleep,clock_nanosleep ... munin-node --foreground ...` was blocked by sandbox ptrace restrictions: `PTRACE_TRACEME: Operation not permitted`.
A non-ptrace smoke run with a temporary `munin-node.conf` was also blocked before idle behavior could be observed because the sandbox does not permit binding a TCP listener: `Cannot bind and listen to TCP port 49499 on 127.0.0.1 [Operation not permitted]`.
## Review Pass 1
RESULT: ok
No blocking findings. The workspace has no source diff, and the author correctly treated the profiler/strace evidence as `inferred` rather than leaving a speculative source patch.
The report is consistent with the evidence bundle: `munin-node` was sampled under `select()`/`pselect6`, but `/proc` showed `S (sleeping)`, `poll_schedule_timeout`, and low CPU. The explanation ties that signal to `script/munin-node` using `Munin::Node::Server` and the inherited `Net::Server::Fork` `can_read(2)` accept loop.
Validation is acceptable for a no-patch diagnosis: project-level `make` and `make check` were attempted with exact blockers, focused Perl syntax checks were run, and the bounded reproduction attempts report concrete sandbox blockers.perl likely remains stuck in a busy-poll loop. A diagnosis report and patch proposal were created locally.
## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.
## Patch Pass
You are working on a bounded fixer proposal.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Produce the smallest reasonable patch for the target repository, keep the change upstreamable, prefer the clearest control flow available, and do not keep avoidable `goto` when a simpler structure would read better. Before introducing new file, process, allocation, locking, networking, or platform APIs, inspect nearby code and project contribution docs for existing helpers or compatibility wrappers and use those local patterns unless you can explain why they do not fit. Validate from a reproducible workspace-root entrypoint before falling back to focused leaf commands; if a build or test cannot run, report the exact command, the exact blocker, and any narrower check you ran instead. During validation, also try one bounded independent reproduction of the collected failure signal when it is safe and cheap, such as a failing test, smoke command, perf/strace comparison, or before/after runtime check. Only use `reproduced` if that command or test actually reproduced the failure; otherwise keep `observed` and report the reproduction blocker. The final explanation must connect the observed issue evidence to the actual code change, not just paraphrase the diff. Write like a maintainer is going to read the patch mail cold: explain the bug in plain language, define subsystem-specific jargon the first time you need it, and make the causal story obvious. Explicitly classify evidence confidence as `reproduced`, `observed`, or `inferred`: `reproduced` means you reproduced the failure locally; `observed` means Fixer has direct crash/log/trace evidence but you did not independently reproduce it; `inferred` means the source patch is not pull-request-ready, so do not leave a source diff unless you first gather stronger observed/reproduced evidence; otherwise return a no-patch diagnosis/report. For any source-changing `observed` patch, say explicitly in `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. Security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior need reproduced evidence plus explicit security-impact analysis before leaving a source diff; otherwise return a no-patch diagnosis/report for human review. If you introduce non-obvious state translation, index remapping, or backend split logic, add a short source comment that explains the invariant being preserved.
Start by explaining the likely root cause from the collected perf, strace, and /proc evidence. If you cannot land a safe patch, leave a diagnosis that is strong enough for an upstream bug report.
Interpreter process expectation: when the hot process is Python, Perl, shell, Node, Ruby, PHP, Lua, or another interpreter, inspect both the runtime and the script/application entrypoint from `details.interpreter_process`. Prefer the script or application package when evidence points there; do not patch the interpreter runtime merely because the hot binary is `python`, `perl`, `bash`, or similar. Runtime fixes are welcome only after checking the entrypoint and explaining why the runtime mishandles the workload or why running bad code faster/safer is itself the right upstream fix.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Keep the change narrowly scoped and summarize validation clearly.
In every authoring pass, your final response must start with `Subject: <single-line git commit subject>` and then include these markdown sections exactly:
## Commit Message
A short upstream-friendly explanation of what changed and why. Write it in plain language that a maintainer can follow without local complaint context. If you use subsystem jargon, define it immediately.
## Evidence Confidence
Exactly one word: `reproduced`, `observed`, or `inferred`. Use `reproduced` only when you reproduced the failure locally with a command or test, and include that command/test in `## Validation`. Use `observed` when Fixer has direct crash/log/trace evidence but you did not independently reproduce it. If `## Git Add Paths` lists source files for an `observed` patch, `## Issue Connection` must explicitly say the failure was observed by Fixer and not independently reproduced. Security-sensitive source changes touching authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior require reproduced evidence and explicit security-impact analysis; otherwise list `None` under `## Git Add Paths` and write a no-patch diagnosis/report. Use `inferred` for profiler/strace/indirect evidence; inferred responses may be no-patch diagnoses or reports, but inferred source patches are not pull-request-ready until stronger evidence is gathered.
## Issue Connection
Write this as maintainer-facing patch mail, not as local Fixer notes. Cover four things explicitly in readable sentences: the user-visible symptom or the exact collected signal, the code-level cause or the cautious inference from evidence, the specific change you made, and the expected effect. Do not invent a reproducer, command line, crash, or user-visible failure that is not present in the evidence bundle. If the evidence is direct-but-not-reproduced, say it was observed by Fixer and not independently reproduced. If the evidence is indirect and you did not gather stronger evidence, do not leave a source diff; write a no-patch diagnosis/report instead. Include an explicit effect sentence such as `The expected effect is ...`, `This should reduce ...`, or `This prevents ...` for source patches. If the logic is non-obvious in code, mention that you added a short explanatory comment.
## Git Add Paths
List the repo-relative paths that belong in the final patch, one per line. Use `None` only when you intentionally made no source changes. Include intentionally new files, and do not list generated build artifacts.
## Validation
List the checks you ran, or say clearly that you could not run them. Include the independent reproduction command/test and result when `## Evidence Confidence` is `reproduced`; if reproduction was attempted but blocked, name the exact blocker and keep confidence at `observed` or `inferred`.
Before editing, read the plan at `./plan-output.txt` and follow it unless the code proves part of it wrong. If you change course, say so explicitly in the final write-up instead of silently drifting from the plan.
## Review Pass 1
You are reviewing a freshly generated fixer patch.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Review the first patch pass. The original pre-edit snapshot is available at `./source` for diffing.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout. The latest author response is at `./patch-output.txt`. Inspect the current code and changed paths like a strict code reviewer. Focus on correctness, regressions, maintainability, awkward control flow such as avoidable `goto`, missing validation, weak or non-gittable commit message text, and explanations that fail to connect the observed issue evidence to the code change. Also review the maintainer experience: the patch mail should be easy to accept upstream, the user-visible bug should be explained in plain language, subsystem-specific jargon should be defined when first used, and any non-obvious state translation or index remapping in code should have a short explanatory comment. Reject patches that omit `## Evidence Confidence`, use anything other than `reproduced`, `observed`, or `inferred`, or sound more certain than that evidence level allows. Reject patches that claim `reproduced` unless `## Validation` names the concrete reproduction command or test and its result. Reject source patches in security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior unless the author reproduced the behavior and explicitly analyzed the security impact of the change; observed-only evidence should become a diagnosis/report, not a PR-ready source diff. Reject patches that invent a reproducer, command line, crash, or user-visible failure not present in the evidence bundle; indirect profiler or strace evidence may justify a cautious mitigation, but the author must say it is indirect instead of presenting it as a confirmed upstream bug. Reject patches that introduce generic libc/std APIs when nearby code or project docs provide a local compat/helper API for the same job, unless the author explicitly justifies the exception. Reject validation that only reports a leaf object/syntax build when a project-level configure/build/test entrypoint exists and was not attempted; if a full build cannot run, the author must show the exact failed command and blocker.
Do not apply code changes in this pass.
Return a short markdown review report. The first non-empty line must be exactly one of:
RESULT: ok
RESULT: fix-needed
If you choose `RESULT: fix-needed`, add a `## Findings` section with concrete, actionable items.## Plan Pass
## Problem
Fixer flagged `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` as a likely busy poll loop, but the retained evidence shows `munin-node` sleeping in `pselect6` with ~2 second timeouts, `State: S`, and only ~0.9% CPU. There is no retained Perl-level stack or script-line evidence tying this to defective Munin logic.
## Evidence Confidence
inferred
## Proposed Subject
No source patch yet: diagnose Munin node select wait evidence before changing upstream code.
## Patch Plan
Do not edit in this pass. The likely maintainer-facing conclusion is that the evidence is profiler-only and does not currently prove a Munin bug.
If more evidence is collected before editing, investigate `script/munin-node`, `lib/Munin/Node/Server.pm`, `lib/Munin/Node/Service.pm`, and `lib/Munin/Node/OS.pm` first. Relevant local helpers/conventions found: `Munin::Common::Timeout::do_with_timeout`, `Munin::Node::OS->run_as_child`, `Munin::Common::Logger`, `Net::Server::Fork`, taint mode, `use strict`, `use warnings`, and the HACKING guidance to follow local file style. No prior Fixer patch is present; `git status` is clean.
Only plan a source patch if an independent reproduction shows a tight immediate-return select/pselect loop or a Munin-level retry loop. Any patch should be a bounded local change in the node server/child IO path, avoid awkward `goto`, and use the existing timeout/logging helpers rather than generic ad hoc control flow.
## Risks
Changing daemon select/timeout behavior without a reproducer could alter connection latency, plugin timeout handling, or `Net::Server::Fork` semantics for normal idle `munin-node` processes. This is not security-sensitive unless later evidence implicates TLS/auth/access-control handling.
## Validation
Before any focused check, try the project entrypoints from the workspace root: `make`, then `make check` if available; if dependency or generated-file setup fails, record the exact command and failure.
Independent bounded reproduction to collect before any source patch: run `munin-node` from the workspace with a temporary minimal config/service directory, sample `ps` CPU/state and `strace -ttT -e trace=pselect6,select,poll,ppoll` for a few seconds, and verify whether waits are blocking or immediately returning. If no tight loop appears, report no patch rather than claiming a reproduced bug.
## Patch Pass
Subject: Diagnose munin-node pselect profiler signal
## Commit Message
No source change was made. The collected perf and `/proc` evidence points to an idle `munin-node` process blocked in `select`/`pselect`, not to a demonstrated tight application loop. Munin’s node daemon uses `Net::Server::Fork`, with local timeout/process helpers such as `Munin::Common::Timeout::do_with_timeout`, `Munin::Node::OS->run_as_child`, and `Munin::Common::Logger`; there was no safe upstreamable code change to make without stronger evidence.
## Evidence Confidence
inferred
## Issue Connection
Fixer observed `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` in repeated poll-family syscall samples, but the retained strace excerpt shows `pselect6` calls sleeping for about 1.8-2.0 seconds, `/proc` reported `State: S (sleeping)`, and the sampled CPU was only about 0.9%. That signal is consistent with Munin’s daemon event loop waiting for network activity, not with a reproduced runaway loop.
I inspected the Perl entrypoint first, as required for interpreter processes. `script/munin-node` delegates to `Munin::Node::Server`, which subclasses `Net::Server::Fork`; nearby local helpers include `Munin::Common::Timeout::do_with_timeout`, `Munin::Node::OS->run_as_child`, and `Munin::Common::Logger`. The only direct `select` in the node code is in `Munin::Node::OS::_read_from_child`, used while reading plugin output under the existing timeout helper. The evidence does not include a Perl-level stack, plugin name, request, or immediate-return syscall trace tying the samples to a Munin source bug.
Following the saved plan, I did not leave a source diff because the independent reproduction was blocked and the available evidence remains profiler/strace-indirect. The expected effect is no code churn for a normal blocking wait that currently lacks a proven defective cause.
## Git Add Paths
None
## Validation
`make` from the workspace root failed before building because `Module::Build` is missing:
`Can't locate Module/Build.pm in @INC ... at Build.PL line 80.`
`make check` failed because the target does not exist:
`make: *** No rule to make target 'check'. Stop.`
Focused checks run:
`perl -Ilib -c lib/Munin/Node/OS.pm` passed, with redefinition warnings because generated/local module resolution falls through to installed modules.
`perl -Ilib -c lib/Munin/Node/Server.pm` passed.
`perl -T -Ilib -c script/munin-node` passed.
Independent reproduction attempt:
`timeout 6 strace -ttT -f -e trace=pselect6,select,poll,ppoll /usr/bin/perl -wT -Ilib script/munin-node ...` was blocked by sandbox ptrace restrictions: `PTRACE_TRACEME: Operation not permitted`.
A fallback foreground smoke attempt with a temporary empty service directory was blocked by sandbox networking: `Cannot bind and listen to TCP port 49499 on 127.0.0.1 [Operation not permitted]`.
No failure was independently reproduced.
## Review Pass 1
RESULT: ok
No source diff is present, and that matches the evidence level. The author correctly classified the evidence as `inferred`, listed `None` under `## Git Add Paths`, and avoided presenting the profiler/strace signal as a confirmed Munin bug.
The review response is consistent with the bundle: the retained strace shows blocking `pselect6` calls around 1.8-2.0 seconds, `/proc` reports `S (sleeping)`, CPU is low, and no Perl-level stack ties the samples to Munin source. The author inspected the interpreter entrypoint and named relevant local conventions/helpers: `Net::Server::Fork`, `Munin::Common::Timeout::do_with_timeout`, `Munin::Node::OS->run_as_child`, and `Munin::Common::Logger`.
Validation is acceptable for a no-patch diagnosis: `make` was attempted and failed on missing `Module::Build`, `make check` was attempted and absent, focused syntax checks were reported, and the independent reproduction attempts were blocked with concrete ptrace/network errors. No invented reproducer or overconfident source-patch claim is present.perl likely remains stuck in a busy-poll loop. A diagnosis report and patch proposal were created locally.
## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.
## Patch Pass
You are working on a bounded fixer proposal.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Produce the smallest reasonable patch for the target repository, keep the change upstreamable, prefer the clearest control flow available, and do not keep avoidable `goto` when a simpler structure would read better. Before introducing new file, process, allocation, locking, networking, or platform APIs, inspect nearby code and project contribution docs for existing helpers or compatibility wrappers and use those local patterns unless you can explain why they do not fit. Validate from a reproducible workspace-root entrypoint before falling back to focused leaf commands; if a build or test cannot run, report the exact command, the exact blocker, and any narrower check you ran instead. During validation, also try one bounded independent reproduction of the collected failure signal when it is safe and cheap, such as a failing test, smoke command, perf/strace comparison, or before/after runtime check. Only use `reproduced` if that command or test actually reproduced the failure; otherwise keep `observed` and report the reproduction blocker. The final explanation must connect the observed issue evidence to the actual code change, not just paraphrase the diff. Write like a maintainer is going to read the patch mail cold: explain the bug in plain language, define subsystem-specific jargon the first time you need it, and make the causal story obvious. Explicitly classify evidence confidence as `reproduced`, `observed`, or `inferred`: `reproduced` means you reproduced the failure locally; `observed` means Fixer has direct crash/log/trace evidence but you did not independently reproduce it; `inferred` means the source patch is not pull-request-ready, so do not leave a source diff unless you first gather stronger observed/reproduced evidence; otherwise return a no-patch diagnosis/report. For any source-changing `observed` patch, say explicitly in `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. Security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior need reproduced evidence plus explicit security-impact analysis before leaving a source diff; otherwise return a no-patch diagnosis/report for human review. If you introduce non-obvious state translation, index remapping, or backend split logic, add a short source comment that explains the invariant being preserved.
Start by explaining the likely root cause from the collected perf, strace, and /proc evidence. If you cannot land a safe patch, leave a diagnosis that is strong enough for an upstream bug report.
Interpreter process expectation: when the hot process is Python, Perl, shell, Node, Ruby, PHP, Lua, or another interpreter, inspect both the runtime and the script/application entrypoint from `details.interpreter_process`. Prefer the script or application package when evidence points there; do not patch the interpreter runtime merely because the hot binary is `python`, `perl`, `bash`, or similar. Runtime fixes are welcome only after checking the entrypoint and explaining why the runtime mishandles the workload or why running bad code faster/safer is itself the right upstream fix.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Keep the change narrowly scoped and summarize validation clearly.
In every authoring pass, your final response must start with `Subject: <single-line git commit subject>` and then include these markdown sections exactly:
## Commit Message
A short upstream-friendly explanation of what changed and why. Write it in plain language that a maintainer can follow without local complaint context. If you use subsystem jargon, define it immediately.
## Evidence Confidence
Exactly one word: `reproduced`, `observed`, or `inferred`. Use `reproduced` only when you reproduced the failure locally with a command or test, and include that command/test in `## Validation`. Use `observed` when Fixer has direct crash/log/trace evidence but you did not independently reproduce it. If `## Git Add Paths` lists source files for an `observed` patch, `## Issue Connection` must explicitly say the failure was observed by Fixer and not independently reproduced. Security-sensitive source changes touching authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior require reproduced evidence and explicit security-impact analysis; otherwise list `None` under `## Git Add Paths` and write a no-patch diagnosis/report. Use `inferred` for profiler/strace/indirect evidence; inferred responses may be no-patch diagnoses or reports, but inferred source patches are not pull-request-ready until stronger evidence is gathered.
## Issue Connection
Write this as maintainer-facing patch mail, not as local Fixer notes. Cover four things explicitly in readable sentences: the user-visible symptom or the exact collected signal, the code-level cause or the cautious inference from evidence, the specific change you made, and the expected effect. Do not invent a reproducer, command line, crash, or user-visible failure that is not present in the evidence bundle. If the evidence is direct-but-not-reproduced, say it was observed by Fixer and not independently reproduced. If the evidence is indirect and you did not gather stronger evidence, do not leave a source diff; write a no-patch diagnosis/report instead. Include an explicit effect sentence such as `The expected effect is ...`, `This should reduce ...`, or `This prevents ...` for source patches. If the logic is non-obvious in code, mention that you added a short explanatory comment.
## Git Add Paths
List the repo-relative paths that belong in the final patch, one per line. Use `None` only when you intentionally made no source changes. Include intentionally new files, and do not list generated build artifacts.
## Validation
List the checks you ran, or say clearly that you could not run them. Include the independent reproduction command/test and result when `## Evidence Confidence` is `reproduced`; if reproduction was attempted but blocked, name the exact blocker and keep confidence at `observed` or `inferred`.
Before editing, read the plan at `./plan-output.txt` and follow it unless the code proves part of it wrong. If you change course, say so explicitly in the final write-up instead of silently drifting from the plan.
## Review Pass 1
You are reviewing a freshly generated fixer patch.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Review the first patch pass. The original pre-edit snapshot is available at `./source` for diffing.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout. The latest author response is at `./patch-output.txt`. Inspect the current code and changed paths like a strict code reviewer. Focus on correctness, regressions, maintainability, awkward control flow such as avoidable `goto`, missing validation, weak or non-gittable commit message text, and explanations that fail to connect the observed issue evidence to the code change. Also review the maintainer experience: the patch mail should be easy to accept upstream, the user-visible bug should be explained in plain language, subsystem-specific jargon should be defined when first used, and any non-obvious state translation or index remapping in code should have a short explanatory comment. Reject patches that omit `## Evidence Confidence`, use anything other than `reproduced`, `observed`, or `inferred`, or sound more certain than that evidence level allows. Reject patches that claim `reproduced` unless `## Validation` names the concrete reproduction command or test and its result. Reject source patches in security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior unless the author reproduced the behavior and explicitly analyzed the security impact of the change; observed-only evidence should become a diagnosis/report, not a PR-ready source diff. Reject patches that invent a reproducer, command line, crash, or user-visible failure not present in the evidence bundle; indirect profiler or strace evidence may justify a cautious mitigation, but the author must say it is indirect instead of presenting it as a confirmed upstream bug. Reject patches that introduce generic libc/std APIs when nearby code or project docs provide a local compat/helper API for the same job, unless the author explicitly justifies the exception. Reject validation that only reports a leaf object/syntax build when a project-level configure/build/test entrypoint exists and was not attempted; if a full build cannot run, the author must show the exact failed command and blocker.
Do not apply code changes in this pass.
Return a short markdown review report. The first non-empty line must be exactly one of:
RESULT: ok
RESULT: fix-needed
If you choose `RESULT: fix-needed`, add a `## Findings` section with concrete, actionable items.## Plan Pass
## Problem
Fixer flagged `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` as a likely busy poll loop, but the retained evidence shows `munin-node` sleeping in `pselect6` with ~2 second timeouts, `State: S`, and only ~0.9% CPU. There is no retained Perl-level stack or script-line evidence tying this to defective Munin logic.
## Evidence Confidence
inferred
## Proposed Subject
No source patch yet: diagnose Munin node select wait evidence before changing upstream code.
## Patch Plan
Do not edit in this pass. The likely maintainer-facing conclusion is that the evidence is profiler-only and does not currently prove a Munin bug.
If more evidence is collected before editing, investigate `script/munin-node`, `lib/Munin/Node/Server.pm`, `lib/Munin/Node/Service.pm`, and `lib/Munin/Node/OS.pm` first. Relevant local helpers/conventions found: `Munin::Common::Timeout::do_with_timeout`, `Munin::Node::OS->run_as_child`, `Munin::Common::Logger`, `Net::Server::Fork`, taint mode, `use strict`, `use warnings`, and the HACKING guidance to follow local file style. No prior Fixer patch is present; `git status` is clean.
Only plan a source patch if an independent reproduction shows a tight immediate-return select/pselect loop or a Munin-level retry loop. Any patch should be a bounded local change in the node server/child IO path, avoid awkward `goto`, and use the existing timeout/logging helpers rather than generic ad hoc control flow.
## Risks
Changing daemon select/timeout behavior without a reproducer could alter connection latency, plugin timeout handling, or `Net::Server::Fork` semantics for normal idle `munin-node` processes. This is not security-sensitive unless later evidence implicates TLS/auth/access-control handling.
## Validation
Before any focused check, try the project entrypoints from the workspace root: `make`, then `make check` if available; if dependency or generated-file setup fails, record the exact command and failure.
Independent bounded reproduction to collect before any source patch: run `munin-node` from the workspace with a temporary minimal config/service directory, sample `ps` CPU/state and `strace -ttT -e trace=pselect6,select,poll,ppoll` for a few seconds, and verify whether waits are blocking or immediately returning. If no tight loop appears, report no patch rather than claiming a reproduced bug.
## Patch Pass
Subject: Diagnose munin-node pselect profiler signal
## Commit Message
No source change was made. The collected perf and `/proc` evidence points to an idle `munin-node` process blocked in `select`/`pselect`, not to a demonstrated tight application loop. Munin’s node daemon uses `Net::Server::Fork`, with local timeout/process helpers such as `Munin::Common::Timeout::do_with_timeout`, `Munin::Node::OS->run_as_child`, and `Munin::Common::Logger`; there was no safe upstreamable code change to make without stronger evidence.
## Evidence Confidence
inferred
## Issue Connection
Fixer observed `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` in repeated poll-family syscall samples, but the retained strace excerpt shows `pselect6` calls sleeping for about 1.8-2.0 seconds, `/proc` reported `State: S (sleeping)`, and the sampled CPU was only about 0.9%. That signal is consistent with Munin’s daemon event loop waiting for network activity, not with a reproduced runaway loop.
I inspected the Perl entrypoint first, as required for interpreter processes. `script/munin-node` delegates to `Munin::Node::Server`, which subclasses `Net::Server::Fork`; nearby local helpers include `Munin::Common::Timeout::do_with_timeout`, `Munin::Node::OS->run_as_child`, and `Munin::Common::Logger`. The only direct `select` in the node code is in `Munin::Node::OS::_read_from_child`, used while reading plugin output under the existing timeout helper. The evidence does not include a Perl-level stack, plugin name, request, or immediate-return syscall trace tying the samples to a Munin source bug.
Following the saved plan, I did not leave a source diff because the independent reproduction was blocked and the available evidence remains profiler/strace-indirect. The expected effect is no code churn for a normal blocking wait that currently lacks a proven defective cause.
## Git Add Paths
None
## Validation
`make` from the workspace root failed before building because `Module::Build` is missing:
`Can't locate Module/Build.pm in @INC ... at Build.PL line 80.`
`make check` failed because the target does not exist:
`make: *** No rule to make target 'check'. Stop.`
Focused checks run:
`perl -Ilib -c lib/Munin/Node/OS.pm` passed, with redefinition warnings because generated/local module resolution falls through to installed modules.
`perl -Ilib -c lib/Munin/Node/Server.pm` passed.
`perl -T -Ilib -c script/munin-node` passed.
Independent reproduction attempt:
`timeout 6 strace -ttT -f -e trace=pselect6,select,poll,ppoll /usr/bin/perl -wT -Ilib script/munin-node ...` was blocked by sandbox ptrace restrictions: `PTRACE_TRACEME: Operation not permitted`.
A fallback foreground smoke attempt with a temporary empty service directory was blocked by sandbox networking: `Cannot bind and listen to TCP port 49499 on 127.0.0.1 [Operation not permitted]`.
No failure was independently reproduced.
## Review Pass 1
RESULT: ok
No source diff is present, and that matches the evidence level. The author correctly classified the evidence as `inferred`, listed `None` under `## Git Add Paths`, and avoided presenting the profiler/strace signal as a confirmed Munin bug.
The review response is consistent with the bundle: the retained strace shows blocking `pselect6` calls around 1.8-2.0 seconds, `/proc` reports `S (sleeping)`, CPU is low, and no Perl-level stack ties the samples to Munin source. The author inspected the interpreter entrypoint and named relevant local conventions/helpers: `Net::Server::Fork`, `Munin::Common::Timeout::do_with_timeout`, `Munin::Node::OS->run_as_child`, and `Munin::Common::Logger`.
Validation is acceptable for a no-patch diagnosis: `make` was attempted and failed on missing `Module::Build`, `make check` was attempted and absent, focused syntax checks were reported, and the independent reproduction attempts were blocked with concrete ptrace/network errors. No invented reproducer or overconfident source-patch claim is present.perl likely remains stuck in a busy-poll loop. A diagnosis report and patch proposal were created locally.
## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.
## Patch Pass
You are working on a bounded fixer proposal.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Produce the smallest reasonable patch for the target repository, keep the change upstreamable, prefer the clearest control flow available, and do not keep avoidable `goto` when a simpler structure would read better. Before introducing new file, process, allocation, locking, networking, or platform APIs, inspect nearby code and project contribution docs for existing helpers or compatibility wrappers and use those local patterns unless you can explain why they do not fit. Validate from a reproducible workspace-root entrypoint before falling back to focused leaf commands; if a build or test cannot run, report the exact command, the exact blocker, and any narrower check you ran instead. During validation, also try one bounded independent reproduction of the collected failure signal when it is safe and cheap, such as a failing test, smoke command, perf/strace comparison, or before/after runtime check. Only use `reproduced` if that command or test actually reproduced the failure; otherwise keep `observed` and report the reproduction blocker. The final explanation must connect the observed issue evidence to the actual code change, not just paraphrase the diff. Write like a maintainer is going to read the patch mail cold: explain the bug in plain language, define subsystem-specific jargon the first time you need it, and make the causal story obvious. Explicitly classify evidence confidence as `reproduced`, `observed`, or `inferred`: `reproduced` means you reproduced the failure locally; `observed` means Fixer has direct crash/log/trace evidence but you did not independently reproduce it; `inferred` means the source patch is not pull-request-ready, so do not leave a source diff unless you first gather stronger observed/reproduced evidence; otherwise return a no-patch diagnosis/report. For any source-changing `observed` patch, say explicitly in `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. Security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior need reproduced evidence plus explicit security-impact analysis before leaving a source diff; otherwise return a no-patch diagnosis/report for human review. If you introduce non-obvious state translation, index remapping, or backend split logic, add a short source comment that explains the invariant being preserved.
Start by explaining the likely root cause from the collected perf, strace, and /proc evidence. If you cannot land a safe patch, leave a diagnosis that is strong enough for an upstream bug report.
Interpreter process expectation: when the hot process is Python, Perl, shell, Node, Ruby, PHP, Lua, or another interpreter, inspect both the runtime and the script/application entrypoint from `details.interpreter_process`. Prefer the script or application package when evidence points there; do not patch the interpreter runtime merely because the hot binary is `python`, `perl`, `bash`, or similar. Runtime fixes are welcome only after checking the entrypoint and explaining why the runtime mishandles the workload or why running bad code faster/safer is itself the right upstream fix.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Keep the change narrowly scoped and summarize validation clearly.
In every authoring pass, your final response must start with `Subject: <single-line git commit subject>` and then include these markdown sections exactly:
## Commit Message
A short upstream-friendly explanation of what changed and why. Write it in plain language that a maintainer can follow without local complaint context. If you use subsystem jargon, define it immediately.
## Evidence Confidence
Exactly one word: `reproduced`, `observed`, or `inferred`. Use `reproduced` only when you reproduced the failure locally with a command or test, and include that command/test in `## Validation`. Use `observed` when Fixer has direct crash/log/trace evidence but you did not independently reproduce it. If `## Git Add Paths` lists source files for an `observed` patch, `## Issue Connection` must explicitly say the failure was observed by Fixer and not independently reproduced. Security-sensitive source changes touching authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior require reproduced evidence and explicit security-impact analysis; otherwise list `None` under `## Git Add Paths` and write a no-patch diagnosis/report. Use `inferred` for profiler/strace/indirect evidence; inferred responses may be no-patch diagnoses or reports, but inferred source patches are not pull-request-ready until stronger evidence is gathered.
## Issue Connection
Write this as maintainer-facing patch mail, not as local Fixer notes. Cover four things explicitly in readable sentences: the user-visible symptom or the exact collected signal, the code-level cause or the cautious inference from evidence, the specific change you made, and the expected effect. Do not invent a reproducer, command line, crash, or user-visible failure that is not present in the evidence bundle. If the evidence is direct-but-not-reproduced, say it was observed by Fixer and not independently reproduced. If the evidence is indirect and you did not gather stronger evidence, do not leave a source diff; write a no-patch diagnosis/report instead. Include an explicit effect sentence such as `The expected effect is ...`, `This should reduce ...`, or `This prevents ...` for source patches. If the logic is non-obvious in code, mention that you added a short explanatory comment.
## Git Add Paths
List the repo-relative paths that belong in the final patch, one per line. Use `None` only when you intentionally made no source changes. Include intentionally new files, and do not list generated build artifacts.
## Validation
List the checks you ran, or say clearly that you could not run them. Include the independent reproduction command/test and result when `## Evidence Confidence` is `reproduced`; if reproduction was attempted but blocked, name the exact blocker and keep confidence at `observed` or `inferred`.
Before editing, read the plan at `./plan-output.txt` and follow it unless the code proves part of it wrong. If you change course, say so explicitly in the final write-up instead of silently drifting from the plan.
## Review Pass 1
You are reviewing a freshly generated fixer patch.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Review the first patch pass. The original pre-edit snapshot is available at `./source` for diffing.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout. The latest author response is at `./patch-output.txt`. Inspect the current code and changed paths like a strict code reviewer. Focus on correctness, regressions, maintainability, awkward control flow such as avoidable `goto`, missing validation, weak or non-gittable commit message text, and explanations that fail to connect the observed issue evidence to the code change. Also review the maintainer experience: the patch mail should be easy to accept upstream, the user-visible bug should be explained in plain language, subsystem-specific jargon should be defined when first used, and any non-obvious state translation or index remapping in code should have a short explanatory comment. Reject patches that omit `## Evidence Confidence`, use anything other than `reproduced`, `observed`, or `inferred`, or sound more certain than that evidence level allows. Reject patches that claim `reproduced` unless `## Validation` names the concrete reproduction command or test and its result. Reject source patches in security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior unless the author reproduced the behavior and explicitly analyzed the security impact of the change; observed-only evidence should become a diagnosis/report, not a PR-ready source diff. Reject patches that invent a reproducer, command line, crash, or user-visible failure not present in the evidence bundle; indirect profiler or strace evidence may justify a cautious mitigation, but the author must say it is indirect instead of presenting it as a confirmed upstream bug. Reject patches that introduce generic libc/std APIs when nearby code or project docs provide a local compat/helper API for the same job, unless the author explicitly justifies the exception. Reject validation that only reports a leaf object/syntax build when a project-level configure/build/test entrypoint exists and was not attempted; if a full build cannot run, the author must show the exact failed command and blocker.
Do not apply code changes in this pass.
Return a short markdown review report. The first non-empty line must be exactly one of:
RESULT: ok
RESULT: fix-needed
If you choose `RESULT: fix-needed`, add a `## Findings` section with concrete, actionable items.## Plan Pass
## Problem
Fixer observed `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` in a poll-family syscall path, but the retained evidence does not tie the loop to a Munin Perl stack line or module call. The strongest artifacts actually show `munin-node` sleeping in `pselect6` with ~1.8-2.0 second timeouts and only 0.9% CPU, so this is not enough to justify an upstream source patch.
## Evidence Confidence
observed
Fixer observed the process and syscall profile, but I did not independently reproduce a busy loop. The evidence bundle itself notes the missing Perl-level stack and recommends inspecting the script entrypoint before blaming Perl or the runtime.
## Proposed Subject
No source patch: report/diagnose inconclusive `munin-node` poll evidence and request a Perl-level stack or reproducible workload before editing.
## Patch Plan
No code change is proposed in this pass.
Inspected upstream contribution/style docs: `CONTRIBUTING.md` points to `HACKING.pod`; new Perl code should use `strict`, `warnings`, taint-mode compatibility, clear English variable names, and existing style.
Inspected the implicated entrypoint and subsystem: `script/munin-node`, `lib/Munin/Node/Server.pm`, `lib/Munin/Node/OS.pm`, `lib/Munin/Common/Timeout.pm`, and `lib/Munin/Node/Config.pm`.
Relevant local conventions/helpers found: `Munin::Node::Server` delegates the daemon accept loop to `Net::Server::Fork`; request/plugin timeouts use `Munin::Common::Timeout::do_with_timeout`; plugin subprocess IO and cleanup use `Munin::Node::OS`; logging uses `Munin::Common::Logger`. No local helper was found that points to a missing bounded sleep or obvious tight loop in the main node idle path.
No prior Fixer patch or workspace edits were present to improve or replace. If later evidence identifies a real loop, the patch should be a small upstream-style change in the implicated function, using these helpers and avoiding awkward control flow such as avoidable `goto`.
## Risks
Patching now would be speculative: it could alter daemon timing, connection handling, TLS negotiation, or plugin execution without evidence that Munin is misbehaving.
The evidence may instead represent normal idle `Net::Server`/Perl select behavior or profiler overhead, since the process state was sleeping and captured `pselect6` calls blocked for seconds.
## Validation
Tried project-level validation from the workspace root:
`make check` failed: no `check` target.
`make` failed in `Build.PL`: missing Perl dependency `Module::Build.pm`.
Focused checks run after that:
`perl -Ilib -c lib/Munin/Node/Server.pm` passed.
`perl -Ilib -c lib/Munin/Node/OS.pm` passed with existing redefinition warnings.
`perl -T -Ilib -c script/munin-node` passed.
Bounded independent reproduction attempt:
`strace` smoke tracing an idle foreground node was blocked by ptrace permissions: `PTRACE_TRACEME: Operation not permitted`. A non-strace foreground smoke attempt exited status 1 without reproducing the observed busy-poll signal.
## Patch Pass
Subject: Diagnose inconclusive munin-node poll profile
## Commit Message
No source change. Fixer captured a `munin-node` Perl process in `pselect6`, but the collected `/proc` and strace data show multi-second blocking waits and a sleeping process, not a proven tight loop in Munin code. Without a Perl-level stack or reproducible workload tying the wait path to a Munin function, an upstream patch would be speculative.
## Evidence Confidence
observed
## Issue Connection
The collected signal is `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` sampled in a poll-family syscall path. The native backtrace reaches Perl runops and `select`, but not a Munin Perl line. The strace excerpt shows only three `pselect6` calls over five seconds, with calls blocking for about 1.8 and 2.0 seconds. `/proc` reports the process as `S (sleeping)` with `wchan` at `poll_schedule_timeout`, and the profile target reports only 0.9% CPU.
The likely root cause from the collected evidence is normal idle waiting or periodic wakeup behavior in the Perl/`Net::Server::Fork` daemon loop, not a demonstrated busy loop in Munin. I inspected the script entrypoint and nearby node server code first, as required for interpreter processes. `script/munin-node` delegates serving to `Munin::Node::Server`, which uses `Net::Server::Fork`; request and plugin timeouts use the local `Munin::Common::Timeout::do_with_timeout` helper; plugin subprocess IO uses `Munin::Node::OS`; logging uses `Munin::Common::Logger`. No relevant local helper or nearby caller showed a missing sleep, zero timeout, or avoidable tight control-flow loop matching the evidence.
I followed the saved plan and did not change course: no source diff was left. The expected effect is to avoid landing an upstream patch that changes daemon timing, connection handling, or plugin execution without evidence that Munin is actually misbehaving. A useful upstream report should include a Perl-level stack, a reproducer, or a live trace that shows repeated nonblocking wakeups tied to a specific Munin function.
## Git Add Paths
None
## Validation
Tried project-level validation from the workspace root:
`make check` failed with: `make: *** No rule to make target 'check'. Stop.`
`make` failed because `Build.PL` could not load `Module::Build.pm`: `Can't locate Module/Build.pm in @INC ... at Build.PL line 80.`
Focused checks run instead:
`perl -Ilib -c lib/Munin/Node/Server.pm` passed.
`perl -Ilib -c lib/Munin/Node/OS.pm` passed, with existing subroutine redefinition warnings.
`perl -T -Ilib -c script/munin-node` passed.
Bounded independent reproduction attempt:
`timeout 4 strace -ttT -f -e trace=pselect6,select,poll,ppoll,epoll_wait,nanosleep,clock_nanosleep perl -T -Ilib script/munin-node --foreground --config ./workspace/t/config/munin-node.conf --servicedir /tmp/munin-fixer-empty-plugins --sconfdir /tmp/munin-fixer-empty-conf`
This was blocked by ptrace restrictions: `PTRACE_TRACEME: Operation not permitted` and `ptrace(PTRACE_SEIZE, 5): Operation not permitted`. I did not independently reproduce the observed poll signal.
## Review Pass 1
RESULT: ok
No source diff is present, and the no-patch diagnosis is appropriate for the evidence level. The author did not invent a reproducer or overstate the profiler/strace signal, kept `## Evidence Confidence` to an allowed value, and explained why the observed `pselect6` samples do not prove a Munin busy loop.
The review also confirms the maintainer-facing output names the relevant local patterns and helpers: `Net::Server::Fork`, `Munin::Common::Timeout::do_with_timeout`, `Munin::Node::OS`, and `Munin::Common::Logger`. Validation is acceptable for a no-patch diagnosis: project-level `make check` and `make` blockers are reported, followed by focused syntax checks and a bounded strace reproduction attempt blocked by ptrace restrictions.perl likely remains stuck in a busy-poll loop. A diagnosis report and patch proposal were created locally.
## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.
## Patch Pass
You are working on a bounded fixer proposal.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Produce the smallest reasonable patch for the target repository, keep the change upstreamable, prefer the clearest control flow available, and do not keep avoidable `goto` when a simpler structure would read better. Before introducing new file, process, allocation, locking, networking, or platform APIs, inspect nearby code and project contribution docs for existing helpers or compatibility wrappers and use those local patterns unless you can explain why they do not fit. Validate from a reproducible workspace-root entrypoint before falling back to focused leaf commands; if a build or test cannot run, report the exact command, the exact blocker, and any narrower check you ran instead. During validation, also try one bounded independent reproduction of the collected failure signal when it is safe and cheap, such as a failing test, smoke command, perf/strace comparison, or before/after runtime check. Only use `reproduced` if that command or test actually reproduced the failure; otherwise keep `observed` and report the reproduction blocker. The final explanation must connect the observed issue evidence to the actual code change, not just paraphrase the diff. Write like a maintainer is going to read the patch mail cold: explain the bug in plain language, define subsystem-specific jargon the first time you need it, and make the causal story obvious. Explicitly classify evidence confidence as `reproduced`, `observed`, or `inferred`: `reproduced` means you reproduced the failure locally; `observed` means Fixer has direct crash/log/trace evidence but you did not independently reproduce it; `inferred` means the source patch is not pull-request-ready, so do not leave a source diff unless you first gather stronger observed/reproduced evidence; otherwise return a no-patch diagnosis/report. For any source-changing `observed` patch, say explicitly in `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. Security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior need reproduced evidence plus explicit security-impact analysis before leaving a source diff; otherwise return a no-patch diagnosis/report for human review. If you introduce non-obvious state translation, index remapping, or backend split logic, add a short source comment that explains the invariant being preserved.
Start by explaining the likely root cause from the collected perf, strace, and /proc evidence. If you cannot land a safe patch, leave a diagnosis that is strong enough for an upstream bug report.
Interpreter process expectation: when the hot process is Python, Perl, shell, Node, Ruby, PHP, Lua, or another interpreter, inspect both the runtime and the script/application entrypoint from `details.interpreter_process`. Prefer the script or application package when evidence points there; do not patch the interpreter runtime merely because the hot binary is `python`, `perl`, `bash`, or similar. Runtime fixes are welcome only after checking the entrypoint and explaining why the runtime mishandles the workload or why running bad code faster/safer is itself the right upstream fix.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Keep the change narrowly scoped and summarize validation clearly.
In every authoring pass, your final response must start with `Subject: <single-line git commit subject>` and then include these markdown sections exactly:
## Commit Message
A short upstream-friendly explanation of what changed and why. Write it in plain language that a maintainer can follow without local complaint context. If you use subsystem jargon, define it immediately.
## Evidence Confidence
Exactly one word: `reproduced`, `observed`, or `inferred`. Use `reproduced` only when you reproduced the failure locally with a command or test, and include that command/test in `## Validation`. Use `observed` when Fixer has direct crash/log/trace evidence but you did not independently reproduce it. If `## Git Add Paths` lists source files for an `observed` patch, `## Issue Connection` must explicitly say the failure was observed by Fixer and not independently reproduced. Security-sensitive source changes touching authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior require reproduced evidence and explicit security-impact analysis; otherwise list `None` under `## Git Add Paths` and write a no-patch diagnosis/report. Use `inferred` for profiler/strace/indirect evidence; inferred responses may be no-patch diagnoses or reports, but inferred source patches are not pull-request-ready until stronger evidence is gathered.
## Issue Connection
Write this as maintainer-facing patch mail, not as local Fixer notes. Cover four things explicitly in readable sentences: the user-visible symptom or the exact collected signal, the code-level cause or the cautious inference from evidence, the specific change you made, and the expected effect. Do not invent a reproducer, command line, crash, or user-visible failure that is not present in the evidence bundle. If the evidence is direct-but-not-reproduced, say it was observed by Fixer and not independently reproduced. If the evidence is indirect and you did not gather stronger evidence, do not leave a source diff; write a no-patch diagnosis/report instead. Include an explicit effect sentence such as `The expected effect is ...`, `This should reduce ...`, or `This prevents ...` for source patches. If the logic is non-obvious in code, mention that you added a short explanatory comment.
## Git Add Paths
List the repo-relative paths that belong in the final patch, one per line. Use `None` only when you intentionally made no source changes. Include intentionally new files, and do not list generated build artifacts.
## Validation
List the checks you ran, or say clearly that you could not run them. Include the independent reproduction command/test and result when `## Evidence Confidence` is `reproduced`; if reproduction was attempted but blocked, name the exact blocker and keep confidence at `observed` or `inferred`.
Before editing, read the plan at `./plan-output.txt` and follow it unless the code proves part of it wrong. If you change course, say so explicitly in the final write-up instead of silently drifting from the plan.
## Review Pass 1
You are reviewing a freshly generated fixer patch.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Review the first patch pass. The original pre-edit snapshot is available at `./source` for diffing.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout. The latest author response is at `./patch-output.txt`. Inspect the current code and changed paths like a strict code reviewer. Focus on correctness, regressions, maintainability, awkward control flow such as avoidable `goto`, missing validation, weak or non-gittable commit message text, and explanations that fail to connect the observed issue evidence to the code change. Also review the maintainer experience: the patch mail should be easy to accept upstream, the user-visible bug should be explained in plain language, subsystem-specific jargon should be defined when first used, and any non-obvious state translation or index remapping in code should have a short explanatory comment. Reject patches that omit `## Evidence Confidence`, use anything other than `reproduced`, `observed`, or `inferred`, or sound more certain than that evidence level allows. Reject patches that claim `reproduced` unless `## Validation` names the concrete reproduction command or test and its result. Reject source patches in security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior unless the author reproduced the behavior and explicitly analyzed the security impact of the change; observed-only evidence should become a diagnosis/report, not a PR-ready source diff. Reject patches that invent a reproducer, command line, crash, or user-visible failure not present in the evidence bundle; indirect profiler or strace evidence may justify a cautious mitigation, but the author must say it is indirect instead of presenting it as a confirmed upstream bug. Reject patches that introduce generic libc/std APIs when nearby code or project docs provide a local compat/helper API for the same job, unless the author explicitly justifies the exception. Reject validation that only reports a leaf object/syntax build when a project-level configure/build/test entrypoint exists and was not attempted; if a full build cannot run, the author must show the exact failed command and blocker.
Do not apply code changes in this pass.
Return a short markdown review report. The first non-empty line must be exactly one of:
RESULT: ok
RESULT: fix-needed
If you choose `RESULT: fix-needed`, add a `## Findings` section with concrete, actionable items.## Plan Pass
## Problem
Fixer observed `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` in a poll-family syscall path, but the retained evidence does not tie the loop to a Munin Perl stack line or module call. The strongest artifacts actually show `munin-node` sleeping in `pselect6` with ~1.8-2.0 second timeouts and only 0.9% CPU, so this is not enough to justify an upstream source patch.
## Evidence Confidence
observed
Fixer observed the process and syscall profile, but I did not independently reproduce a busy loop. The evidence bundle itself notes the missing Perl-level stack and recommends inspecting the script entrypoint before blaming Perl or the runtime.
## Proposed Subject
No source patch: report/diagnose inconclusive `munin-node` poll evidence and request a Perl-level stack or reproducible workload before editing.
## Patch Plan
No code change is proposed in this pass.
Inspected upstream contribution/style docs: `CONTRIBUTING.md` points to `HACKING.pod`; new Perl code should use `strict`, `warnings`, taint-mode compatibility, clear English variable names, and existing style.
Inspected the implicated entrypoint and subsystem: `script/munin-node`, `lib/Munin/Node/Server.pm`, `lib/Munin/Node/OS.pm`, `lib/Munin/Common/Timeout.pm`, and `lib/Munin/Node/Config.pm`.
Relevant local conventions/helpers found: `Munin::Node::Server` delegates the daemon accept loop to `Net::Server::Fork`; request/plugin timeouts use `Munin::Common::Timeout::do_with_timeout`; plugin subprocess IO and cleanup use `Munin::Node::OS`; logging uses `Munin::Common::Logger`. No local helper was found that points to a missing bounded sleep or obvious tight loop in the main node idle path.
No prior Fixer patch or workspace edits were present to improve or replace. If later evidence identifies a real loop, the patch should be a small upstream-style change in the implicated function, using these helpers and avoiding awkward control flow such as avoidable `goto`.
## Risks
Patching now would be speculative: it could alter daemon timing, connection handling, TLS negotiation, or plugin execution without evidence that Munin is misbehaving.
The evidence may instead represent normal idle `Net::Server`/Perl select behavior or profiler overhead, since the process state was sleeping and captured `pselect6` calls blocked for seconds.
## Validation
Tried project-level validation from the workspace root:
`make check` failed: no `check` target.
`make` failed in `Build.PL`: missing Perl dependency `Module::Build.pm`.
Focused checks run after that:
`perl -Ilib -c lib/Munin/Node/Server.pm` passed.
`perl -Ilib -c lib/Munin/Node/OS.pm` passed with existing redefinition warnings.
`perl -T -Ilib -c script/munin-node` passed.
Bounded independent reproduction attempt:
`strace` smoke tracing an idle foreground node was blocked by ptrace permissions: `PTRACE_TRACEME: Operation not permitted`. A non-strace foreground smoke attempt exited status 1 without reproducing the observed busy-poll signal.
## Patch Pass
Subject: Diagnose inconclusive munin-node poll profile
## Commit Message
No source change. Fixer captured a `munin-node` Perl process in `pselect6`, but the collected `/proc` and strace data show multi-second blocking waits and a sleeping process, not a proven tight loop in Munin code. Without a Perl-level stack or reproducible workload tying the wait path to a Munin function, an upstream patch would be speculative.
## Evidence Confidence
observed
## Issue Connection
The collected signal is `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` sampled in a poll-family syscall path. The native backtrace reaches Perl runops and `select`, but not a Munin Perl line. The strace excerpt shows only three `pselect6` calls over five seconds, with calls blocking for about 1.8 and 2.0 seconds. `/proc` reports the process as `S (sleeping)` with `wchan` at `poll_schedule_timeout`, and the profile target reports only 0.9% CPU.
The likely root cause from the collected evidence is normal idle waiting or periodic wakeup behavior in the Perl/`Net::Server::Fork` daemon loop, not a demonstrated busy loop in Munin. I inspected the script entrypoint and nearby node server code first, as required for interpreter processes. `script/munin-node` delegates serving to `Munin::Node::Server`, which uses `Net::Server::Fork`; request and plugin timeouts use the local `Munin::Common::Timeout::do_with_timeout` helper; plugin subprocess IO uses `Munin::Node::OS`; logging uses `Munin::Common::Logger`. No relevant local helper or nearby caller showed a missing sleep, zero timeout, or avoidable tight control-flow loop matching the evidence.
I followed the saved plan and did not change course: no source diff was left. The expected effect is to avoid landing an upstream patch that changes daemon timing, connection handling, or plugin execution without evidence that Munin is actually misbehaving. A useful upstream report should include a Perl-level stack, a reproducer, or a live trace that shows repeated nonblocking wakeups tied to a specific Munin function.
## Git Add Paths
None
## Validation
Tried project-level validation from the workspace root:
`make check` failed with: `make: *** No rule to make target 'check'. Stop.`
`make` failed because `Build.PL` could not load `Module::Build.pm`: `Can't locate Module/Build.pm in @INC ... at Build.PL line 80.`
Focused checks run instead:
`perl -Ilib -c lib/Munin/Node/Server.pm` passed.
`perl -Ilib -c lib/Munin/Node/OS.pm` passed, with existing subroutine redefinition warnings.
`perl -T -Ilib -c script/munin-node` passed.
Bounded independent reproduction attempt:
`timeout 4 strace -ttT -f -e trace=pselect6,select,poll,ppoll,epoll_wait,nanosleep,clock_nanosleep perl -T -Ilib script/munin-node --foreground --config ./workspace/t/config/munin-node.conf --servicedir /tmp/munin-fixer-empty-plugins --sconfdir /tmp/munin-fixer-empty-conf`
This was blocked by ptrace restrictions: `PTRACE_TRACEME: Operation not permitted` and `ptrace(PTRACE_SEIZE, 5): Operation not permitted`. I did not independently reproduce the observed poll signal.
## Review Pass 1
RESULT: ok
No source diff is present, and the no-patch diagnosis is appropriate for the evidence level. The author did not invent a reproducer or overstate the profiler/strace signal, kept `## Evidence Confidence` to an allowed value, and explained why the observed `pselect6` samples do not prove a Munin busy loop.
The review also confirms the maintainer-facing output names the relevant local patterns and helpers: `Net::Server::Fork`, `Munin::Common::Timeout::do_with_timeout`, `Munin::Node::OS`, and `Munin::Common::Logger`. Validation is acceptable for a no-patch diagnosis: project-level `make check` and `make` blockers are reported, followed by focused syntax checks and a bounded strace reproduction attempt blocked by ptrace restrictions.perl likely remains stuck in a busy-poll loop. A diagnosis report and patch proposal were created locally.
## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.
## Patch Pass
You are working on a bounded fixer proposal.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Produce the smallest reasonable patch for the target repository, keep the change upstreamable, prefer the clearest control flow available, and do not keep avoidable `goto` when a simpler structure would read better. Before introducing new file, process, allocation, locking, networking, or platform APIs, inspect nearby code and project contribution docs for existing helpers or compatibility wrappers and use those local patterns unless you can explain why they do not fit. Validate from a reproducible workspace-root entrypoint before falling back to focused leaf commands; if a build or test cannot run, report the exact command, the exact blocker, and any narrower check you ran instead. During validation, also try one bounded independent reproduction of the collected failure signal when it is safe and cheap, such as a failing test, smoke command, perf/strace comparison, or before/after runtime check. Only use `reproduced` if that command or test actually reproduced the failure; otherwise keep `observed` and report the reproduction blocker. The final explanation must connect the observed issue evidence to the actual code change, not just paraphrase the diff. Write like a maintainer is going to read the patch mail cold: explain the bug in plain language, define subsystem-specific jargon the first time you need it, and make the causal story obvious. Explicitly classify evidence confidence as `reproduced`, `observed`, or `inferred`: `reproduced` means you reproduced the failure locally; `observed` means Fixer has direct crash/log/trace evidence but you did not independently reproduce it; `inferred` means the source patch is not pull-request-ready, so do not leave a source diff unless you first gather stronger observed/reproduced evidence; otherwise return a no-patch diagnosis/report. For any source-changing `observed` patch, say explicitly in `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. Security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior need reproduced evidence plus explicit security-impact analysis before leaving a source diff; otherwise return a no-patch diagnosis/report for human review. If you introduce non-obvious state translation, index remapping, or backend split logic, add a short source comment that explains the invariant being preserved.
Start by explaining the likely root cause from the collected perf, strace, and /proc evidence. If you cannot land a safe patch, leave a diagnosis that is strong enough for an upstream bug report.
Interpreter process expectation: when the hot process is Python, Perl, shell, Node, Ruby, PHP, Lua, or another interpreter, inspect both the runtime and the script/application entrypoint from `details.interpreter_process`. Prefer the script or application package when evidence points there; do not patch the interpreter runtime merely because the hot binary is `python`, `perl`, `bash`, or similar. Runtime fixes are welcome only after checking the entrypoint and explaining why the runtime mishandles the workload or why running bad code faster/safer is itself the right upstream fix.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Keep the change narrowly scoped and summarize validation clearly.
In every authoring pass, your final response must start with `Subject: <single-line git commit subject>` and then include these markdown sections exactly:
## Commit Message
A short upstream-friendly explanation of what changed and why. Write it in plain language that a maintainer can follow without local complaint context. If you use subsystem jargon, define it immediately.
## Evidence Confidence
Exactly one word: `reproduced`, `observed`, or `inferred`. Use `reproduced` only when you reproduced the failure locally with a command or test, and include that command/test in `## Validation`. Use `observed` when Fixer has direct crash/log/trace evidence but you did not independently reproduce it. If `## Git Add Paths` lists source files for an `observed` patch, `## Issue Connection` must explicitly say the failure was observed by Fixer and not independently reproduced. Security-sensitive source changes touching authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior require reproduced evidence and explicit security-impact analysis; otherwise list `None` under `## Git Add Paths` and write a no-patch diagnosis/report. Use `inferred` for profiler/strace/indirect evidence; inferred responses may be no-patch diagnoses or reports, but inferred source patches are not pull-request-ready until stronger evidence is gathered.
## Issue Connection
Write this as maintainer-facing patch mail, not as local Fixer notes. Cover four things explicitly in readable sentences: the user-visible symptom or the exact collected signal, the code-level cause or the cautious inference from evidence, the specific change you made, and the expected effect. Do not invent a reproducer, command line, crash, or user-visible failure that is not present in the evidence bundle. If the evidence is direct-but-not-reproduced, say it was observed by Fixer and not independently reproduced. If the evidence is indirect and you did not gather stronger evidence, do not leave a source diff; write a no-patch diagnosis/report instead. Include an explicit effect sentence such as `The expected effect is ...`, `This should reduce ...`, or `This prevents ...` for source patches. If the logic is non-obvious in code, mention that you added a short explanatory comment.
## Git Add Paths
List the repo-relative paths that belong in the final patch, one per line. Use `None` only when you intentionally made no source changes. Include intentionally new files, and do not list generated build artifacts.
## Validation
List the checks you ran, or say clearly that you could not run them. Include the independent reproduction command/test and result when `## Evidence Confidence` is `reproduced`; if reproduction was attempted but blocked, name the exact blocker and keep confidence at `observed` or `inferred`.
Before editing, read the plan at `./plan-output.txt` and follow it unless the code proves part of it wrong. If you change course, say so explicitly in the final write-up instead of silently drifting from the plan.
## Review Pass 1
You are reviewing a freshly generated fixer patch.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Review the first patch pass. The original pre-edit snapshot is available at `./source` for diffing.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout. The latest author response is at `./patch-output.txt`. Inspect the current code and changed paths like a strict code reviewer. Focus on correctness, regressions, maintainability, awkward control flow such as avoidable `goto`, missing validation, weak or non-gittable commit message text, and explanations that fail to connect the observed issue evidence to the code change. Also review the maintainer experience: the patch mail should be easy to accept upstream, the user-visible bug should be explained in plain language, subsystem-specific jargon should be defined when first used, and any non-obvious state translation or index remapping in code should have a short explanatory comment. Reject patches that omit `## Evidence Confidence`, use anything other than `reproduced`, `observed`, or `inferred`, or sound more certain than that evidence level allows. Reject patches that claim `reproduced` unless `## Validation` names the concrete reproduction command or test and its result. Reject source patches in security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior unless the author reproduced the behavior and explicitly analyzed the security impact of the change; observed-only evidence should become a diagnosis/report, not a PR-ready source diff. Reject patches that invent a reproducer, command line, crash, or user-visible failure not present in the evidence bundle; indirect profiler or strace evidence may justify a cautious mitigation, but the author must say it is indirect instead of presenting it as a confirmed upstream bug. Reject patches that introduce generic libc/std APIs when nearby code or project docs provide a local compat/helper API for the same job, unless the author explicitly justifies the exception. Reject validation that only reports a leaf object/syntax build when a project-level configure/build/test entrypoint exists and was not attempted; if a full build cannot run, the author must show the exact failed command and blocker.
Do not apply code changes in this pass.
Return a short markdown review report. The first non-empty line must be exactly one of:
RESULT: ok
RESULT: fix-needed
If you choose `RESULT: fix-needed`, add a `## Findings` section with concrete, actionable items.## Plan Pass
## Problem
Fixer observed `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` in repeated `pselect6` calls and classified it as a likely busy-poll loop. The retained strace shows `pselect6` sleeping for about 1.8-2.0 seconds, process state `S`, and only `0.9%` CPU, so the bundle does not currently prove a tight application loop or a Perl runtime bug.
## Evidence Confidence
observed
## Proposed Subject
No source patch yet: diagnose the `munin-node` idle/select behavior and reject a speculative fix unless a bounded reproduction produces a zero/near-zero timeout loop or a Perl-level stack tied to Munin code.
## Patch Plan
Inspect the script entrypoint first: `script/munin-node` creates `Munin::Node::Service` and runs `Munin::Node::Server`, matching the evidence command line.
Treat the likely select sites as `Net::Server::Fork` request waiting, `Munin::Node::Server::_net_read`, or `Munin::Node::OS::_read_from_child`. The observed 2-second `pselect6` timeout does not point to a runaway loop by itself.
Follow local conventions from `CONTRIBUTING.md` and `HACKING.pod`: Perl taint-compatible code, `strict`/`warnings`, `English`, existing logging through `Munin::Common::Logger`, timeouts via `Munin::Common::Timeout::do_with_timeout`, and process/file helpers in `Munin::Node::OS`.
No prior Fixer patch appears to need replacement; the workspace only shows the `Fixer baseline` commit.
If additional evidence later proves a real loop, prefer a bounded local fix in the implicated Munin select/read path without awkward control flow such as avoidable `goto`.
## Risks
A source patch based only on this bundle would risk changing normal daemon idle behavior. This area also touches daemon request handling and plugin child reaping, so an unproven timeout change could regress long-running plugin handling or client sessions.
## Validation
First run project-level validation from the workspace root: `make`, then `make check` only if that target exists; this tree exposes `make test`, so use `make test` for the project test entrypoint.
For a bounded independent signal check, run `munin-node` from the workspace with a test config under `timeout` and trace only poll/select syscalls, for example `timeout 5s strace -ttT -f -e trace=pselect6,select,poll,ppoll perl -Ilib script/munin-node --foreground --config t/config/munin-node.conf`. Do not claim reproduction unless this shows rapid zero/near-zero timeout polling. If dependencies or generated files block project validation, report the exact failing command and reason, then fall back to focused `perl -c` checks for `script/munin-node`, `lib/Munin/Node/Server.pm`, and `lib/Munin/Node/OS.pm`.
## Patch Pass
Subject: Diagnose munin-node select wait evidence without patch
## Commit Message
No source change is proposed. The likely root cause of this finding is a normal `munin-node` daemon wait being misclassified as a busy poll: the captured `pselect6` calls slept for about two seconds, `/proc` showed the process sleeping, and CPU use was below 1%.
Munin’s relevant code already routes this through the script entrypoint, `Net::Server::Fork`, `Munin::Common::Timeout::do_with_timeout`, `Munin::Common::Logger`, and `Munin::Node::OS` process helpers. I did not find stronger evidence tying the signal to a Munin source bug.
## Evidence Confidence
inferred
## Issue Connection
The collected signal is a Perl process running `/usr/sbin/munin-node --foreground` with native frames under `select()` and repeated `pselect6` syscalls. The important detail is that those syscalls timed out after roughly 1.8-2.0 seconds, while `/proc` reported state `S (sleeping)` and the sampled CPU total was only `0.9%`.
The cautious code-level inference is that Fixer sampled `munin-node` while it was in an ordinary daemon wait path, not in a confirmed tight loop. The entrypoint `script/munin-node` initializes `Munin::Node::Server`, which subclasses `Net::Server::Fork`; plugin execution and child reads use `Munin::Node::OS->run_as_child` and `Munin::Common::Timeout::do_with_timeout`. Those are the local helper patterns this subsystem uses for process handling, logging, and timeouts.
I made no source change because the evidence is profiler/strace-only and lacks a Perl-level stack or local reproduction showing a zero-timeout spin. The expected effect is that upstream review is not burdened with a speculative timeout or event-loop change that could alter normal daemon behavior.
## Git Add Paths
None
## Validation
`make` from the workspace root failed before building because `Module::Build` is missing: `Can't locate Module/Build.pm in @INC ... at Build.PL line 80`, followed by `make: *** [Makefile:149: Build] Error 2`.
`make check` failed because this tree has no `check` target: `make: *** No rule to make target 'check'. Stop.`
`make test` hit the same `Module::Build` blocker as `make`.
Focused checks run after the project-level blocker:
`perl -Ilib -c lib/Munin/Common/Timeout.pm` passed.
`perl -Ilib -c lib/Munin/Node/OS.pm` passed with existing subroutine redefinition warnings.
`perl -Ilib -c lib/Munin/Node/Server.pm` passed.
`perl -T -Ilib -c script/munin-node` passed.
Independent reproduction attempt:
`timeout 5s strace -ttT -f -e trace=pselect6,select,poll,ppoll perl -T -Ilib script/munin-node --foreground --config t/config/munin-node.conf` could not run because ptrace is blocked in this environment: `PTRACE_TRACEME: Operation not permitted` and `ptrace(PTRACE_SEIZE, 5): Operation not permitted`. The failure signal was not locally reproduced.
## Review Pass 1
RESULT: ok
The first pass leaves no source diff, which is appropriate for this evidence. The author response includes `## Evidence Confidence` with valid value `inferred`, does not claim reproduction, and explains that the available profiler/strace evidence shows sleeping `pselect6` calls rather than a confirmed busy loop.
Validation is acceptable for a no-patch diagnosis: project-level `make`, `make check`, and `make test` were attempted, blockers were reported, focused Perl syntax checks were run, and the independent strace reproduction attempt reported the ptrace permission blocker. The response also names the relevant Munin conventions and helpers (`Net::Server::Fork`, `Munin::Common::Timeout`, `Munin::Common::Logger`, `Munin::Node::OS`) and avoids inventing a user-visible failure.perl likely remains stuck in a busy-poll loop. A diagnosis report and patch proposal were created locally.
## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.
## Patch Pass
You are working on a bounded fixer proposal.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Produce the smallest reasonable patch for the target repository, keep the change upstreamable, prefer the clearest control flow available, and do not keep avoidable `goto` when a simpler structure would read better. Before introducing new file, process, allocation, locking, networking, or platform APIs, inspect nearby code and project contribution docs for existing helpers or compatibility wrappers and use those local patterns unless you can explain why they do not fit. Validate from a reproducible workspace-root entrypoint before falling back to focused leaf commands; if a build or test cannot run, report the exact command, the exact blocker, and any narrower check you ran instead. During validation, also try one bounded independent reproduction of the collected failure signal when it is safe and cheap, such as a failing test, smoke command, perf/strace comparison, or before/after runtime check. Only use `reproduced` if that command or test actually reproduced the failure; otherwise keep `observed` and report the reproduction blocker. The final explanation must connect the observed issue evidence to the actual code change, not just paraphrase the diff. Write like a maintainer is going to read the patch mail cold: explain the bug in plain language, define subsystem-specific jargon the first time you need it, and make the causal story obvious. Explicitly classify evidence confidence as `reproduced`, `observed`, or `inferred`: `reproduced` means you reproduced the failure locally; `observed` means Fixer has direct crash/log/trace evidence but you did not independently reproduce it; `inferred` means the source patch is not pull-request-ready, so do not leave a source diff unless you first gather stronger observed/reproduced evidence; otherwise return a no-patch diagnosis/report. For any source-changing `observed` patch, say explicitly in `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. Security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior need reproduced evidence plus explicit security-impact analysis before leaving a source diff; otherwise return a no-patch diagnosis/report for human review. If you introduce non-obvious state translation, index remapping, or backend split logic, add a short source comment that explains the invariant being preserved.
Start by explaining the likely root cause from the collected perf, strace, and /proc evidence. If you cannot land a safe patch, leave a diagnosis that is strong enough for an upstream bug report.
Interpreter process expectation: when the hot process is Python, Perl, shell, Node, Ruby, PHP, Lua, or another interpreter, inspect both the runtime and the script/application entrypoint from `details.interpreter_process`. Prefer the script or application package when evidence points there; do not patch the interpreter runtime merely because the hot binary is `python`, `perl`, `bash`, or similar. Runtime fixes are welcome only after checking the entrypoint and explaining why the runtime mishandles the workload or why running bad code faster/safer is itself the right upstream fix.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Keep the change narrowly scoped and summarize validation clearly.
In every authoring pass, your final response must start with `Subject: <single-line git commit subject>` and then include these markdown sections exactly:
## Commit Message
A short upstream-friendly explanation of what changed and why. Write it in plain language that a maintainer can follow without local complaint context. If you use subsystem jargon, define it immediately.
## Evidence Confidence
Exactly one word: `reproduced`, `observed`, or `inferred`. Use `reproduced` only when you reproduced the failure locally with a command or test, and include that command/test in `## Validation`. Use `observed` when Fixer has direct crash/log/trace evidence but you did not independently reproduce it. If `## Git Add Paths` lists source files for an `observed` patch, `## Issue Connection` must explicitly say the failure was observed by Fixer and not independently reproduced. Security-sensitive source changes touching authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior require reproduced evidence and explicit security-impact analysis; otherwise list `None` under `## Git Add Paths` and write a no-patch diagnosis/report. Use `inferred` for profiler/strace/indirect evidence; inferred responses may be no-patch diagnoses or reports, but inferred source patches are not pull-request-ready until stronger evidence is gathered.
## Issue Connection
Write this as maintainer-facing patch mail, not as local Fixer notes. Cover four things explicitly in readable sentences: the user-visible symptom or the exact collected signal, the code-level cause or the cautious inference from evidence, the specific change you made, and the expected effect. Do not invent a reproducer, command line, crash, or user-visible failure that is not present in the evidence bundle. If the evidence is direct-but-not-reproduced, say it was observed by Fixer and not independently reproduced. If the evidence is indirect and you did not gather stronger evidence, do not leave a source diff; write a no-patch diagnosis/report instead. Include an explicit effect sentence such as `The expected effect is ...`, `This should reduce ...`, or `This prevents ...` for source patches. If the logic is non-obvious in code, mention that you added a short explanatory comment.
## Git Add Paths
List the repo-relative paths that belong in the final patch, one per line. Use `None` only when you intentionally made no source changes. Include intentionally new files, and do not list generated build artifacts.
## Validation
List the checks you ran, or say clearly that you could not run them. Include the independent reproduction command/test and result when `## Evidence Confidence` is `reproduced`; if reproduction was attempted but blocked, name the exact blocker and keep confidence at `observed` or `inferred`.
Before editing, read the plan at `./plan-output.txt` and follow it unless the code proves part of it wrong. If you change course, say so explicitly in the final write-up instead of silently drifting from the plan.
## Review Pass 1
You are reviewing a freshly generated fixer patch.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Review the first patch pass. The original pre-edit snapshot is available at `./source` for diffing.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout. The latest author response is at `./patch-output.txt`. Inspect the current code and changed paths like a strict code reviewer. Focus on correctness, regressions, maintainability, awkward control flow such as avoidable `goto`, missing validation, weak or non-gittable commit message text, and explanations that fail to connect the observed issue evidence to the code change. Also review the maintainer experience: the patch mail should be easy to accept upstream, the user-visible bug should be explained in plain language, subsystem-specific jargon should be defined when first used, and any non-obvious state translation or index remapping in code should have a short explanatory comment. Reject patches that omit `## Evidence Confidence`, use anything other than `reproduced`, `observed`, or `inferred`, or sound more certain than that evidence level allows. Reject patches that claim `reproduced` unless `## Validation` names the concrete reproduction command or test and its result. Reject source patches in security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior unless the author reproduced the behavior and explicitly analyzed the security impact of the change; observed-only evidence should become a diagnosis/report, not a PR-ready source diff. Reject patches that invent a reproducer, command line, crash, or user-visible failure not present in the evidence bundle; indirect profiler or strace evidence may justify a cautious mitigation, but the author must say it is indirect instead of presenting it as a confirmed upstream bug. Reject patches that introduce generic libc/std APIs when nearby code or project docs provide a local compat/helper API for the same job, unless the author explicitly justifies the exception. Reject validation that only reports a leaf object/syntax build when a project-level configure/build/test entrypoint exists and was not attempted; if a full build cannot run, the author must show the exact failed command and blocker.
Do not apply code changes in this pass.
Return a short markdown review report. The first non-empty line must be exactly one of:
RESULT: ok
RESULT: fix-needed
If you choose `RESULT: fix-needed`, add a `## Findings` section with concrete, actionable items.## Plan Pass
## Problem
Fixer observed `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` in repeated `pselect6` calls and classified it as a likely busy-poll loop. The retained strace shows `pselect6` sleeping for about 1.8-2.0 seconds, process state `S`, and only `0.9%` CPU, so the bundle does not currently prove a tight application loop or a Perl runtime bug.
## Evidence Confidence
observed
## Proposed Subject
No source patch yet: diagnose the `munin-node` idle/select behavior and reject a speculative fix unless a bounded reproduction produces a zero/near-zero timeout loop or a Perl-level stack tied to Munin code.
## Patch Plan
Inspect the script entrypoint first: `script/munin-node` creates `Munin::Node::Service` and runs `Munin::Node::Server`, matching the evidence command line.
Treat the likely select sites as `Net::Server::Fork` request waiting, `Munin::Node::Server::_net_read`, or `Munin::Node::OS::_read_from_child`. The observed 2-second `pselect6` timeout does not point to a runaway loop by itself.
Follow local conventions from `CONTRIBUTING.md` and `HACKING.pod`: Perl taint-compatible code, `strict`/`warnings`, `English`, existing logging through `Munin::Common::Logger`, timeouts via `Munin::Common::Timeout::do_with_timeout`, and process/file helpers in `Munin::Node::OS`.
No prior Fixer patch appears to need replacement; the workspace only shows the `Fixer baseline` commit.
If additional evidence later proves a real loop, prefer a bounded local fix in the implicated Munin select/read path without awkward control flow such as avoidable `goto`.
## Risks
A source patch based only on this bundle would risk changing normal daemon idle behavior. This area also touches daemon request handling and plugin child reaping, so an unproven timeout change could regress long-running plugin handling or client sessions.
## Validation
First run project-level validation from the workspace root: `make`, then `make check` only if that target exists; this tree exposes `make test`, so use `make test` for the project test entrypoint.
For a bounded independent signal check, run `munin-node` from the workspace with a test config under `timeout` and trace only poll/select syscalls, for example `timeout 5s strace -ttT -f -e trace=pselect6,select,poll,ppoll perl -Ilib script/munin-node --foreground --config t/config/munin-node.conf`. Do not claim reproduction unless this shows rapid zero/near-zero timeout polling. If dependencies or generated files block project validation, report the exact failing command and reason, then fall back to focused `perl -c` checks for `script/munin-node`, `lib/Munin/Node/Server.pm`, and `lib/Munin/Node/OS.pm`.
## Patch Pass
Subject: Diagnose munin-node select wait evidence without patch
## Commit Message
No source change is proposed. The likely root cause of this finding is a normal `munin-node` daemon wait being misclassified as a busy poll: the captured `pselect6` calls slept for about two seconds, `/proc` showed the process sleeping, and CPU use was below 1%.
Munin’s relevant code already routes this through the script entrypoint, `Net::Server::Fork`, `Munin::Common::Timeout::do_with_timeout`, `Munin::Common::Logger`, and `Munin::Node::OS` process helpers. I did not find stronger evidence tying the signal to a Munin source bug.
## Evidence Confidence
inferred
## Issue Connection
The collected signal is a Perl process running `/usr/sbin/munin-node --foreground` with native frames under `select()` and repeated `pselect6` syscalls. The important detail is that those syscalls timed out after roughly 1.8-2.0 seconds, while `/proc` reported state `S (sleeping)` and the sampled CPU total was only `0.9%`.
The cautious code-level inference is that Fixer sampled `munin-node` while it was in an ordinary daemon wait path, not in a confirmed tight loop. The entrypoint `script/munin-node` initializes `Munin::Node::Server`, which subclasses `Net::Server::Fork`; plugin execution and child reads use `Munin::Node::OS->run_as_child` and `Munin::Common::Timeout::do_with_timeout`. Those are the local helper patterns this subsystem uses for process handling, logging, and timeouts.
I made no source change because the evidence is profiler/strace-only and lacks a Perl-level stack or local reproduction showing a zero-timeout spin. The expected effect is that upstream review is not burdened with a speculative timeout or event-loop change that could alter normal daemon behavior.
## Git Add Paths
None
## Validation
`make` from the workspace root failed before building because `Module::Build` is missing: `Can't locate Module/Build.pm in @INC ... at Build.PL line 80`, followed by `make: *** [Makefile:149: Build] Error 2`.
`make check` failed because this tree has no `check` target: `make: *** No rule to make target 'check'. Stop.`
`make test` hit the same `Module::Build` blocker as `make`.
Focused checks run after the project-level blocker:
`perl -Ilib -c lib/Munin/Common/Timeout.pm` passed.
`perl -Ilib -c lib/Munin/Node/OS.pm` passed with existing subroutine redefinition warnings.
`perl -Ilib -c lib/Munin/Node/Server.pm` passed.
`perl -T -Ilib -c script/munin-node` passed.
Independent reproduction attempt:
`timeout 5s strace -ttT -f -e trace=pselect6,select,poll,ppoll perl -T -Ilib script/munin-node --foreground --config t/config/munin-node.conf` could not run because ptrace is blocked in this environment: `PTRACE_TRACEME: Operation not permitted` and `ptrace(PTRACE_SEIZE, 5): Operation not permitted`. The failure signal was not locally reproduced.
## Review Pass 1
RESULT: ok
The first pass leaves no source diff, which is appropriate for this evidence. The author response includes `## Evidence Confidence` with valid value `inferred`, does not claim reproduction, and explains that the available profiler/strace evidence shows sleeping `pselect6` calls rather than a confirmed busy loop.
Validation is acceptable for a no-patch diagnosis: project-level `make`, `make check`, and `make test` were attempted, blockers were reported, focused Perl syntax checks were run, and the independent strace reproduction attempt reported the ptrace permission blocker. The response also names the relevant Munin conventions and helpers (`Net::Server::Fork`, `Munin::Common::Timeout`, `Munin::Common::Logger`, `Munin::Node::OS`) and avoids inventing a user-visible failure.perl likely remains stuck in a busy-poll loop. A diagnosis report and patch proposal were created locally.
## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.
## Patch Pass
You are working on a bounded fixer proposal.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Produce the smallest reasonable patch for the target repository, keep the change upstreamable, prefer the clearest control flow available, and do not keep avoidable `goto` when a simpler structure would read better. Before introducing new file, process, allocation, locking, networking, or platform APIs, inspect nearby code and project contribution docs for existing helpers or compatibility wrappers and use those local patterns unless you can explain why they do not fit. Validate from a reproducible workspace-root entrypoint before falling back to focused leaf commands; if a build or test cannot run, report the exact command, the exact blocker, and any narrower check you ran instead. During validation, also try one bounded independent reproduction of the collected failure signal when it is safe and cheap, such as a failing test, smoke command, perf/strace comparison, or before/after runtime check. Only use `reproduced` if that command or test actually reproduced the failure; otherwise keep `observed` and report the reproduction blocker. The final explanation must connect the observed issue evidence to the actual code change, not just paraphrase the diff. Write like a maintainer is going to read the patch mail cold: explain the bug in plain language, define subsystem-specific jargon the first time you need it, and make the causal story obvious. Explicitly classify evidence confidence as `reproduced`, `observed`, or `inferred`: `reproduced` means you reproduced the failure locally; `observed` means Fixer has direct crash/log/trace evidence but you did not independently reproduce it; `inferred` means the source patch is not pull-request-ready, so do not leave a source diff unless you first gather stronger observed/reproduced evidence; otherwise return a no-patch diagnosis/report. For any source-changing `observed` patch, say explicitly in `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. Security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior need reproduced evidence plus explicit security-impact analysis before leaving a source diff; otherwise return a no-patch diagnosis/report for human review. If you introduce non-obvious state translation, index remapping, or backend split logic, add a short source comment that explains the invariant being preserved.
Start by explaining the likely root cause from the collected perf, strace, and /proc evidence. If you cannot land a safe patch, leave a diagnosis that is strong enough for an upstream bug report.
Interpreter process expectation: when the hot process is Python, Perl, shell, Node, Ruby, PHP, Lua, or another interpreter, inspect both the runtime and the script/application entrypoint from `details.interpreter_process`. Prefer the script or application package when evidence points there; do not patch the interpreter runtime merely because the hot binary is `python`, `perl`, `bash`, or similar. Runtime fixes are welcome only after checking the entrypoint and explaining why the runtime mishandles the workload or why running bad code faster/safer is itself the right upstream fix.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Keep the change narrowly scoped and summarize validation clearly.
In every authoring pass, your final response must start with `Subject: <single-line git commit subject>` and then include these markdown sections exactly:
## Commit Message
A short upstream-friendly explanation of what changed and why. Write it in plain language that a maintainer can follow without local complaint context. If you use subsystem jargon, define it immediately.
## Evidence Confidence
Exactly one word: `reproduced`, `observed`, or `inferred`. Use `reproduced` only when you reproduced the failure locally with a command or test, and include that command/test in `## Validation`. Use `observed` when Fixer has direct crash/log/trace evidence but you did not independently reproduce it. If `## Git Add Paths` lists source files for an `observed` patch, `## Issue Connection` must explicitly say the failure was observed by Fixer and not independently reproduced. Security-sensitive source changes touching authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior require reproduced evidence and explicit security-impact analysis; otherwise list `None` under `## Git Add Paths` and write a no-patch diagnosis/report. Use `inferred` for profiler/strace/indirect evidence; inferred responses may be no-patch diagnoses or reports, but inferred source patches are not pull-request-ready until stronger evidence is gathered.
## Issue Connection
Write this as maintainer-facing patch mail, not as local Fixer notes. Cover four things explicitly in readable sentences: the user-visible symptom or the exact collected signal, the code-level cause or the cautious inference from evidence, the specific change you made, and the expected effect. Do not invent a reproducer, command line, crash, or user-visible failure that is not present in the evidence bundle. If the evidence is direct-but-not-reproduced, say it was observed by Fixer and not independently reproduced. If the evidence is indirect and you did not gather stronger evidence, do not leave a source diff; write a no-patch diagnosis/report instead. Include an explicit effect sentence such as `The expected effect is ...`, `This should reduce ...`, or `This prevents ...` for source patches. If the logic is non-obvious in code, mention that you added a short explanatory comment.
## Git Add Paths
List the repo-relative paths that belong in the final patch, one per line. Use `None` only when you intentionally made no source changes. Include intentionally new files, and do not list generated build artifacts.
## Validation
List the checks you ran, or say clearly that you could not run them. Include the independent reproduction command/test and result when `## Evidence Confidence` is `reproduced`; if reproduction was attempted but blocked, name the exact blocker and keep confidence at `observed` or `inferred`.
Before editing, read the plan at `./plan-output.txt` and follow it unless the code proves part of it wrong. If you change course, say so explicitly in the final write-up instead of silently drifting from the plan.
## Review Pass 1
You are reviewing a freshly generated fixer patch.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Review the first patch pass. The original pre-edit snapshot is available at `./source` for diffing.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout. The latest author response is at `./patch-output.txt`. Inspect the current code and changed paths like a strict code reviewer. Focus on correctness, regressions, maintainability, awkward control flow such as avoidable `goto`, missing validation, weak or non-gittable commit message text, and explanations that fail to connect the observed issue evidence to the code change. Also review the maintainer experience: the patch mail should be easy to accept upstream, the user-visible bug should be explained in plain language, subsystem-specific jargon should be defined when first used, and any non-obvious state translation or index remapping in code should have a short explanatory comment. Reject patches that omit `## Evidence Confidence`, use anything other than `reproduced`, `observed`, or `inferred`, or sound more certain than that evidence level allows. Reject patches that claim `reproduced` unless `## Validation` names the concrete reproduction command or test and its result. Reject source patches in security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior unless the author reproduced the behavior and explicitly analyzed the security impact of the change; observed-only evidence should become a diagnosis/report, not a PR-ready source diff. Reject patches that invent a reproducer, command line, crash, or user-visible failure not present in the evidence bundle; indirect profiler or strace evidence may justify a cautious mitigation, but the author must say it is indirect instead of presenting it as a confirmed upstream bug. Reject patches that introduce generic libc/std APIs when nearby code or project docs provide a local compat/helper API for the same job, unless the author explicitly justifies the exception. Reject validation that only reports a leaf object/syntax build when a project-level configure/build/test entrypoint exists and was not attempted; if a full build cannot run, the author must show the exact failed command and blocker.
Do not apply code changes in this pass.
Return a short markdown review report. The first non-empty line must be exactly one of:
RESULT: ok
RESULT: fix-needed
If you choose `RESULT: fix-needed`, add a `## Findings` section with concrete, actionable items.## Plan Pass
## Problem
Fixer observed `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` in `select`/`pselect6`, but the retained syscall evidence shows waits of about 1.8-2.0 seconds, process state `S (sleeping)`, and only ~0.9% CPU. That does not currently establish a munin-node busy loop or a Perl runtime bug.
## Evidence Confidence
observed
## Proposed Subject
No source patch yet: diagnose the Fixer signal as insufficient for an upstream munin-node CPU fix unless a bounded repro can show non-blocking repeated wakeups or a Perl-level stack tied to munin-node code.
## Patch Plan
Do not edit code in this pass. The relevant entrypoint is `script/munin-node`, which delegates to `Munin::Node::Server->run()` using `Net::Server::Fork`.
If later evidence proves a real loop, investigate `lib/Munin/Node/Server.pm` first, especially `process_request`, `_net_read`, and timeout handling through the local `Munin::Common::Timeout::do_with_timeout` helper. Also check plugin child handling through `Munin::Node::OS->run_as_child`, which already wraps blocking child reads with `do_with_timeout`.
Reject speculative changes to timeout/poll cadence because this touches timing behavior and the current evidence shows blocking waits, not a confirmed spin. No prior Fixer patch was present in the workspace.
Maintainer conventions found: `CONTRIBUTING.md` points to `HACKING.pod`; new Perl should use `strict`, `warnings`, taint-compatible style, `English`, file-local indentation, and existing Munin helpers instead of ad hoc timeout/process logic.
## Risks
A source patch based only on the current profile would risk changing normal daemon idle behavior. The evidence lacks a Perl-level stack, a live reproducer, or syscall data showing rapid zero-timeout polling.
## Validation
Project entrypoints tried from workspace root:
`make` failed before tests because `Module::Build.pm` is missing:
`Can't locate Module/Build.pm ... at Build.PL line 80`.
`make -n check` failed because there is no `check` target.
Focused checks that are reproducible here:
`perl -Ilib -c lib/Munin/Node/Server.pm` passes.
`perl -Ilib -c lib/Munin/Common/Timeout.pm` passes.
Bounded independent repro attempt:
`timeout 5 perl -Ilib -wT script/munin-node --foreground --config <abs>/t/config/munin-node.conf --servicedir <abs>/plugins/node.d.debug --sconfdir <abs>/t/config/plugin-conf.d` exited `1` with no diagnostic output.
`strace` cannot be used in this sandbox: `PTRACE_TRACEME: Operation not permitted`.
## Patch Pass
Subject: No patch: munin-node profile shows blocking select
## Commit Message
No source change is proposed. The collected data points to `munin-node` sleeping in a normal `select`/`pselect6` wait, not to a proven busy loop. Changing the server loop or timeout behavior would be timing-sensitive and needs reproduced evidence first.
## Evidence Confidence
inferred
## Issue Connection
Fixer observed `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` with native frames under Perl and `select`, but the `/proc` and `strace` details show `State: S (sleeping)`, `wchan: poll_schedule_timeout`, about 0.9% CPU, and only three `pselect6` calls over five seconds, each blocking for about 1.8-2.0 seconds.
The cautious inference is that the profiler classified an idle wait path as a busy-poll signal. The entrypoint is `script/munin-node`, which uses `Munin::Node::Server` on `Net::Server::Fork`; request and plugin work already use local timeout/process helpers such as `Munin::Common::Timeout::do_with_timeout` and `Munin::Node::OS->run_as_child`. I also checked the Perl runtime context, but the evidence does not show Perl mishandling the workload.
I made no source change because any patch here would likely alter timing/throttling behavior without a local reproduction or a Perl-level stack tying the wait to faulty munin-node logic. The expected effect is to avoid an upstream patch based on an unproven diagnosis; the next useful evidence would be a trace showing rapid non-blocking `pselect6` wakeups or a Perl stack captured during actual high CPU.
## Git Add Paths
None
## Validation
`make` from the workspace root failed because `Module::Build.pm` is missing:
`Can't locate Module/Build.pm ... at Build.PL line 80`.
`make check` from the workspace root failed because there is no `check` target:
`make: *** No rule to make target 'check'. Stop.`
Focused checks:
`perl -T -Ilib -c script/munin-node` passed.
`perl -Ilib -c lib/Munin/Node/Server.pm` passed.
`perl -Ilib -c lib/Munin/Common/Timeout.pm` passed.
Bounded reproduction attempt:
`timeout 5 strace -ttT -f -e trace=pselect6,select,poll,ppoll,epoll_wait,nanosleep,clock_nanosleep perl -Ilib -wT script/munin-node ...` was blocked by sandbox ptrace restrictions:
`PTRACE_TRACEME: Operation not permitted`.
## Review Pass 1
RESULT: ok
No source changes are present in the workspace, which matches the author’s no-patch diagnosis.
The response correctly avoids a timing/throttling source patch because the evidence shows a sleeping `munin-node` process with blocking `pselect6` calls rather than a reproduced busy loop. It includes `## Evidence Confidence` with an allowed value, does not claim reproduction, names the local entrypoint and helpers (`Munin::Node::Server`, `Net::Server::Fork`, `Munin::Common::Timeout::do_with_timeout`, `Munin::Node::OS->run_as_child`), and reports project-level validation blockers for `make` and `make check` before focused syntax checks.
Residual note: the bounded `strace` reproduction command is abbreviated with `...`, but the blocker is clear and no source patch is being proposed, so this is not a rejection issue.perl likely remains stuck in a busy-poll loop. A diagnosis report and patch proposal were created locally.
## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.
## Patch Pass
You are working on a bounded fixer proposal.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Produce the smallest reasonable patch for the target repository, keep the change upstreamable, prefer the clearest control flow available, and do not keep avoidable `goto` when a simpler structure would read better. Before introducing new file, process, allocation, locking, networking, or platform APIs, inspect nearby code and project contribution docs for existing helpers or compatibility wrappers and use those local patterns unless you can explain why they do not fit. Validate from a reproducible workspace-root entrypoint before falling back to focused leaf commands; if a build or test cannot run, report the exact command, the exact blocker, and any narrower check you ran instead. During validation, also try one bounded independent reproduction of the collected failure signal when it is safe and cheap, such as a failing test, smoke command, perf/strace comparison, or before/after runtime check. Only use `reproduced` if that command or test actually reproduced the failure; otherwise keep `observed` and report the reproduction blocker. The final explanation must connect the observed issue evidence to the actual code change, not just paraphrase the diff. Write like a maintainer is going to read the patch mail cold: explain the bug in plain language, define subsystem-specific jargon the first time you need it, and make the causal story obvious. Explicitly classify evidence confidence as `reproduced`, `observed`, or `inferred`: `reproduced` means you reproduced the failure locally; `observed` means Fixer has direct crash/log/trace evidence but you did not independently reproduce it; `inferred` means the source patch is not pull-request-ready, so do not leave a source diff unless you first gather stronger observed/reproduced evidence; otherwise return a no-patch diagnosis/report. For any source-changing `observed` patch, say explicitly in `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. Security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior need reproduced evidence plus explicit security-impact analysis before leaving a source diff; otherwise return a no-patch diagnosis/report for human review. If you introduce non-obvious state translation, index remapping, or backend split logic, add a short source comment that explains the invariant being preserved.
Start by explaining the likely root cause from the collected perf, strace, and /proc evidence. If you cannot land a safe patch, leave a diagnosis that is strong enough for an upstream bug report.
Interpreter process expectation: when the hot process is Python, Perl, shell, Node, Ruby, PHP, Lua, or another interpreter, inspect both the runtime and the script/application entrypoint from `details.interpreter_process`. Prefer the script or application package when evidence points there; do not patch the interpreter runtime merely because the hot binary is `python`, `perl`, `bash`, or similar. Runtime fixes are welcome only after checking the entrypoint and explaining why the runtime mishandles the workload or why running bad code faster/safer is itself the right upstream fix.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Keep the change narrowly scoped and summarize validation clearly.
In every authoring pass, your final response must start with `Subject: <single-line git commit subject>` and then include these markdown sections exactly:
## Commit Message
A short upstream-friendly explanation of what changed and why. Write it in plain language that a maintainer can follow without local complaint context. If you use subsystem jargon, define it immediately.
## Evidence Confidence
Exactly one word: `reproduced`, `observed`, or `inferred`. Use `reproduced` only when you reproduced the failure locally with a command or test, and include that command/test in `## Validation`. Use `observed` when Fixer has direct crash/log/trace evidence but you did not independently reproduce it. If `## Git Add Paths` lists source files for an `observed` patch, `## Issue Connection` must explicitly say the failure was observed by Fixer and not independently reproduced. Security-sensitive source changes touching authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior require reproduced evidence and explicit security-impact analysis; otherwise list `None` under `## Git Add Paths` and write a no-patch diagnosis/report. Use `inferred` for profiler/strace/indirect evidence; inferred responses may be no-patch diagnoses or reports, but inferred source patches are not pull-request-ready until stronger evidence is gathered.
## Issue Connection
Write this as maintainer-facing patch mail, not as local Fixer notes. Cover four things explicitly in readable sentences: the user-visible symptom or the exact collected signal, the code-level cause or the cautious inference from evidence, the specific change you made, and the expected effect. Do not invent a reproducer, command line, crash, or user-visible failure that is not present in the evidence bundle. If the evidence is direct-but-not-reproduced, say it was observed by Fixer and not independently reproduced. If the evidence is indirect and you did not gather stronger evidence, do not leave a source diff; write a no-patch diagnosis/report instead. Include an explicit effect sentence such as `The expected effect is ...`, `This should reduce ...`, or `This prevents ...` for source patches. If the logic is non-obvious in code, mention that you added a short explanatory comment.
## Git Add Paths
List the repo-relative paths that belong in the final patch, one per line. Use `None` only when you intentionally made no source changes. Include intentionally new files, and do not list generated build artifacts.
## Validation
List the checks you ran, or say clearly that you could not run them. Include the independent reproduction command/test and result when `## Evidence Confidence` is `reproduced`; if reproduction was attempted but blocked, name the exact blocker and keep confidence at `observed` or `inferred`.
Before editing, read the plan at `./plan-output.txt` and follow it unless the code proves part of it wrong. If you change course, say so explicitly in the final write-up instead of silently drifting from the plan.
## Review Pass 1
You are reviewing a freshly generated fixer patch.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Review the first patch pass. The original pre-edit snapshot is available at `./source` for diffing.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout. The latest author response is at `./patch-output.txt`. Inspect the current code and changed paths like a strict code reviewer. Focus on correctness, regressions, maintainability, awkward control flow such as avoidable `goto`, missing validation, weak or non-gittable commit message text, and explanations that fail to connect the observed issue evidence to the code change. Also review the maintainer experience: the patch mail should be easy to accept upstream, the user-visible bug should be explained in plain language, subsystem-specific jargon should be defined when first used, and any non-obvious state translation or index remapping in code should have a short explanatory comment. Reject patches that omit `## Evidence Confidence`, use anything other than `reproduced`, `observed`, or `inferred`, or sound more certain than that evidence level allows. Reject patches that claim `reproduced` unless `## Validation` names the concrete reproduction command or test and its result. Reject source patches in security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior unless the author reproduced the behavior and explicitly analyzed the security impact of the change; observed-only evidence should become a diagnosis/report, not a PR-ready source diff. Reject patches that invent a reproducer, command line, crash, or user-visible failure not present in the evidence bundle; indirect profiler or strace evidence may justify a cautious mitigation, but the author must say it is indirect instead of presenting it as a confirmed upstream bug. Reject patches that introduce generic libc/std APIs when nearby code or project docs provide a local compat/helper API for the same job, unless the author explicitly justifies the exception. Reject validation that only reports a leaf object/syntax build when a project-level configure/build/test entrypoint exists and was not attempted; if a full build cannot run, the author must show the exact failed command and blocker.
Do not apply code changes in this pass.
Return a short markdown review report. The first non-empty line must be exactly one of:
RESULT: ok
RESULT: fix-needed
If you choose `RESULT: fix-needed`, add a `## Findings` section with concrete, actionable items.## Plan Pass
## Problem
Fixer observed `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` in `select`/`pselect6`, but the retained syscall evidence shows waits of about 1.8-2.0 seconds, process state `S (sleeping)`, and only ~0.9% CPU. That does not currently establish a munin-node busy loop or a Perl runtime bug.
## Evidence Confidence
observed
## Proposed Subject
No source patch yet: diagnose the Fixer signal as insufficient for an upstream munin-node CPU fix unless a bounded repro can show non-blocking repeated wakeups or a Perl-level stack tied to munin-node code.
## Patch Plan
Do not edit code in this pass. The relevant entrypoint is `script/munin-node`, which delegates to `Munin::Node::Server->run()` using `Net::Server::Fork`.
If later evidence proves a real loop, investigate `lib/Munin/Node/Server.pm` first, especially `process_request`, `_net_read`, and timeout handling through the local `Munin::Common::Timeout::do_with_timeout` helper. Also check plugin child handling through `Munin::Node::OS->run_as_child`, which already wraps blocking child reads with `do_with_timeout`.
Reject speculative changes to timeout/poll cadence because this touches timing behavior and the current evidence shows blocking waits, not a confirmed spin. No prior Fixer patch was present in the workspace.
Maintainer conventions found: `CONTRIBUTING.md` points to `HACKING.pod`; new Perl should use `strict`, `warnings`, taint-compatible style, `English`, file-local indentation, and existing Munin helpers instead of ad hoc timeout/process logic.
## Risks
A source patch based only on the current profile would risk changing normal daemon idle behavior. The evidence lacks a Perl-level stack, a live reproducer, or syscall data showing rapid zero-timeout polling.
## Validation
Project entrypoints tried from workspace root:
`make` failed before tests because `Module::Build.pm` is missing:
`Can't locate Module/Build.pm ... at Build.PL line 80`.
`make -n check` failed because there is no `check` target.
Focused checks that are reproducible here:
`perl -Ilib -c lib/Munin/Node/Server.pm` passes.
`perl -Ilib -c lib/Munin/Common/Timeout.pm` passes.
Bounded independent repro attempt:
`timeout 5 perl -Ilib -wT script/munin-node --foreground --config <abs>/t/config/munin-node.conf --servicedir <abs>/plugins/node.d.debug --sconfdir <abs>/t/config/plugin-conf.d` exited `1` with no diagnostic output.
`strace` cannot be used in this sandbox: `PTRACE_TRACEME: Operation not permitted`.
## Patch Pass
Subject: No patch: munin-node profile shows blocking select
## Commit Message
No source change is proposed. The collected data points to `munin-node` sleeping in a normal `select`/`pselect6` wait, not to a proven busy loop. Changing the server loop or timeout behavior would be timing-sensitive and needs reproduced evidence first.
## Evidence Confidence
inferred
## Issue Connection
Fixer observed `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` with native frames under Perl and `select`, but the `/proc` and `strace` details show `State: S (sleeping)`, `wchan: poll_schedule_timeout`, about 0.9% CPU, and only three `pselect6` calls over five seconds, each blocking for about 1.8-2.0 seconds.
The cautious inference is that the profiler classified an idle wait path as a busy-poll signal. The entrypoint is `script/munin-node`, which uses `Munin::Node::Server` on `Net::Server::Fork`; request and plugin work already use local timeout/process helpers such as `Munin::Common::Timeout::do_with_timeout` and `Munin::Node::OS->run_as_child`. I also checked the Perl runtime context, but the evidence does not show Perl mishandling the workload.
I made no source change because any patch here would likely alter timing/throttling behavior without a local reproduction or a Perl-level stack tying the wait to faulty munin-node logic. The expected effect is to avoid an upstream patch based on an unproven diagnosis; the next useful evidence would be a trace showing rapid non-blocking `pselect6` wakeups or a Perl stack captured during actual high CPU.
## Git Add Paths
None
## Validation
`make` from the workspace root failed because `Module::Build.pm` is missing:
`Can't locate Module/Build.pm ... at Build.PL line 80`.
`make check` from the workspace root failed because there is no `check` target:
`make: *** No rule to make target 'check'. Stop.`
Focused checks:
`perl -T -Ilib -c script/munin-node` passed.
`perl -Ilib -c lib/Munin/Node/Server.pm` passed.
`perl -Ilib -c lib/Munin/Common/Timeout.pm` passed.
Bounded reproduction attempt:
`timeout 5 strace -ttT -f -e trace=pselect6,select,poll,ppoll,epoll_wait,nanosleep,clock_nanosleep perl -Ilib -wT script/munin-node ...` was blocked by sandbox ptrace restrictions:
`PTRACE_TRACEME: Operation not permitted`.
## Review Pass 1
RESULT: ok
No source changes are present in the workspace, which matches the author’s no-patch diagnosis.
The response correctly avoids a timing/throttling source patch because the evidence shows a sleeping `munin-node` process with blocking `pselect6` calls rather than a reproduced busy loop. It includes `## Evidence Confidence` with an allowed value, does not claim reproduction, names the local entrypoint and helpers (`Munin::Node::Server`, `Net::Server::Fork`, `Munin::Common::Timeout::do_with_timeout`, `Munin::Node::OS->run_as_child`), and reports project-level validation blockers for `make` and `make check` before focused syntax checks.
Residual note: the bounded `strace` reproduction command is abbreviated with `...`, but the blocker is clear and no source patch is being proposed, so this is not a rejection issue.perl likely remains stuck in a busy-poll loop. A diagnosis report and patch proposal were created locally.
## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.
## Patch Pass
You are working on a bounded fixer proposal.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Produce the smallest reasonable patch for the target repository, keep the change upstreamable, prefer the clearest control flow available, and do not keep avoidable `goto` when a simpler structure would read better. Before introducing new file, process, allocation, locking, networking, or platform APIs, inspect nearby code and project contribution docs for existing helpers or compatibility wrappers and use those local patterns unless you can explain why they do not fit. Validate from a reproducible workspace-root entrypoint before falling back to focused leaf commands; if a build or test cannot run, report the exact command, the exact blocker, and any narrower check you ran instead. During validation, also try one bounded independent reproduction of the collected failure signal when it is safe and cheap, such as a failing test, smoke command, perf/strace comparison, or before/after runtime check. Only use `reproduced` if that command or test actually reproduced the failure; otherwise keep `observed` and report the reproduction blocker. The final explanation must connect the observed issue evidence to the actual code change, not just paraphrase the diff. Write like a maintainer is going to read the patch mail cold: explain the bug in plain language, define subsystem-specific jargon the first time you need it, and make the causal story obvious. Explicitly classify evidence confidence as `reproduced`, `observed`, or `inferred`: `reproduced` means you reproduced the failure locally; `observed` means Fixer has direct crash/log/trace evidence but you did not independently reproduce it; `inferred` means the source patch is not pull-request-ready, so do not leave a source diff unless you first gather stronger observed/reproduced evidence; otherwise return a no-patch diagnosis/report. For any source-changing `observed` patch, say explicitly in `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. Security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior need reproduced evidence plus explicit security-impact analysis before leaving a source diff; otherwise return a no-patch diagnosis/report for human review. If you introduce non-obvious state translation, index remapping, or backend split logic, add a short source comment that explains the invariant being preserved.
Start by explaining the likely root cause from the collected perf, strace, and /proc evidence. If you cannot land a safe patch, leave a diagnosis that is strong enough for an upstream bug report.
Interpreter process expectation: when the hot process is Python, Perl, shell, Node, Ruby, PHP, Lua, or another interpreter, inspect both the runtime and the script/application entrypoint from `details.interpreter_process`. Prefer the script or application package when evidence points there; do not patch the interpreter runtime merely because the hot binary is `python`, `perl`, `bash`, or similar. Runtime fixes are welcome only after checking the entrypoint and explaining why the runtime mishandles the workload or why running bad code faster/safer is itself the right upstream fix.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Keep the change narrowly scoped and summarize validation clearly.
In every authoring pass, your final response must start with `Subject: <single-line git commit subject>` and then include these markdown sections exactly:
## Commit Message
A short upstream-friendly explanation of what changed and why. Write it in plain language that a maintainer can follow without local complaint context. If you use subsystem jargon, define it immediately.
## Evidence Confidence
Exactly one word: `reproduced`, `observed`, or `inferred`. Use `reproduced` only when you reproduced the failure locally with a command or test, and include that command/test in `## Validation`. Use `observed` when Fixer has direct crash/log/trace evidence but you did not independently reproduce it. If `## Git Add Paths` lists source files for an `observed` patch, `## Issue Connection` must explicitly say the failure was observed by Fixer and not independently reproduced. Security-sensitive source changes touching authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior require reproduced evidence and explicit security-impact analysis; otherwise list `None` under `## Git Add Paths` and write a no-patch diagnosis/report. Use `inferred` for profiler/strace/indirect evidence; inferred responses may be no-patch diagnoses or reports, but inferred source patches are not pull-request-ready until stronger evidence is gathered.
## Issue Connection
Write this as maintainer-facing patch mail, not as local Fixer notes. Cover four things explicitly in readable sentences: the user-visible symptom or the exact collected signal, the code-level cause or the cautious inference from evidence, the specific change you made, and the expected effect. Do not invent a reproducer, command line, crash, or user-visible failure that is not present in the evidence bundle. If the evidence is direct-but-not-reproduced, say it was observed by Fixer and not independently reproduced. If the evidence is indirect and you did not gather stronger evidence, do not leave a source diff; write a no-patch diagnosis/report instead. Include an explicit effect sentence such as `The expected effect is ...`, `This should reduce ...`, or `This prevents ...` for source patches. If the logic is non-obvious in code, mention that you added a short explanatory comment.
## Git Add Paths
List the repo-relative paths that belong in the final patch, one per line. Use `None` only when you intentionally made no source changes. Include intentionally new files, and do not list generated build artifacts.
## Validation
List the checks you ran, or say clearly that you could not run them. Include the independent reproduction command/test and result when `## Evidence Confidence` is `reproduced`; if reproduction was attempted but blocked, name the exact blocker and keep confidence at `observed` or `inferred`.
Before editing, read the plan at `./plan-output.txt` and follow it unless the code proves part of it wrong. If you change course, say so explicitly in the final write-up instead of silently drifting from the plan.
## Review Pass 1
You are reviewing a freshly generated fixer patch.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Review the first patch pass. The original pre-edit snapshot is available at `./source` for diffing.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout. The latest author response is at `./patch-output.txt`. Inspect the current code and changed paths like a strict code reviewer. Focus on correctness, regressions, maintainability, awkward control flow such as avoidable `goto`, missing validation, weak or non-gittable commit message text, and explanations that fail to connect the observed issue evidence to the code change. Also review the maintainer experience: the patch mail should be easy to accept upstream, the user-visible bug should be explained in plain language, subsystem-specific jargon should be defined when first used, and any non-obvious state translation or index remapping in code should have a short explanatory comment. Reject patches that omit `## Evidence Confidence`, use anything other than `reproduced`, `observed`, or `inferred`, or sound more certain than that evidence level allows. Reject patches that claim `reproduced` unless `## Validation` names the concrete reproduction command or test and its result. Reject source patches in security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior unless the author reproduced the behavior and explicitly analyzed the security impact of the change; observed-only evidence should become a diagnosis/report, not a PR-ready source diff. Reject patches that invent a reproducer, command line, crash, or user-visible failure not present in the evidence bundle; indirect profiler or strace evidence may justify a cautious mitigation, but the author must say it is indirect instead of presenting it as a confirmed upstream bug. Reject patches that introduce generic libc/std APIs when nearby code or project docs provide a local compat/helper API for the same job, unless the author explicitly justifies the exception. Reject validation that only reports a leaf object/syntax build when a project-level configure/build/test entrypoint exists and was not attempted; if a full build cannot run, the author must show the exact failed command and blocker.
Do not apply code changes in this pass.
Return a short markdown review report. The first non-empty line must be exactly one of:
RESULT: ok
RESULT: fix-needed
If you choose `RESULT: fix-needed`, add a `## Findings` section with concrete, actionable items.## Plan Pass
## Problem
Fixer flagged `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` as a likely busy poll loop, but the retained evidence does not prove an application-level runaway. The captured `strace` shows `pselect6` calls blocking for about 1.8-2.0 seconds, process state was `S (sleeping)`, and sampled CPU was only `0.9%`.
## Evidence Confidence
observed
## Proposed Subject
No source patch: classify the captured `munin-node` signal as insufficient for an upstream busy-loop fix
## Patch Plan
Do not edit source in this pass. The evidence points at the `munin-node` script entrypoint and `Munin::Node::Server`, but the sampled syscall behavior looks like normal Net::Server idle waiting rather than a tight loop.
Relevant conventions found: `CONTRIBUTING.md` points to `HACKING.pod`; Perl code should use `strict`, `warnings`, taint-compatible style, existing logging via `Munin::Common::Logger`, and timeout handling via `Munin::Common::Timeout::do_with_timeout`. Nearby node helpers include `Munin::Node::OS->run_as_child` for plugin subprocesses. No relevant prior Fixer patch was found; existing Debian patches are unrelated.
A source patch would be blocked unless additional evidence shows rapid zero-timeout polling, a Perl-level stack tied to `Munin::Node::Server` or `Munin::Node::OS`, or a reproducible node configuration that causes CPU spin. Avoid speculative control-flow changes such as adding sleeps or `goto`-style exits.
## Risks
Adding a throttling or sleep change without reproduction could regress connection latency or mask real plugin hangs. Since this area affects daemon timing behavior, treat any future source change as timing-sensitive and require a concrete reproduction plus impact analysis first.
## Validation
Before any focused check, try the project entrypoints from the workspace root: `make`, then `make test` because there is no `make check` target.
For bounded independent evidence collection, run a local foreground `munin-node` under `strace -ttT -e trace=pselect6,select,poll,ppoll` with a short `timeout`, using generated/build artifacts if needed. Only claim `reproduced` if that shows rapid non-blocking poll/select calls or sustained CPU; otherwise report this as an observed Fixer signal not independently reproduced.
## Patch Pass
Subject: No patch: report munin-node poll evidence as inconclusive
## Commit Message
No source change was made. The collected signal points at `munin-node`, but the retained `strace` and `/proc` data show a sleeping daemon blocked in timed `pselect6` calls, not a reproduced busy loop. A timing or throttling change would be unsafe without a local reproduction showing rapid non-blocking polling or sustained CPU use.
## Evidence Confidence
observed
## Issue Connection
Fixer observed `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` with native Perl frames and repeated poll-family syscalls. The concrete trace contains only three `pselect6` calls over five seconds, each blocking for about 1.8 to 2.0 seconds, while `/proc` showed state `S (sleeping)` and the sampled process CPU was `0.9%`.
The cautious code-level inference is that this is likely the normal idle wait in Munin’s `Net::Server::Fork`-based node daemon, not a proven tight polling loop. The entrypoint is `script/munin-node`, which hands off to `Munin::Node::Server->run`; nearby code already uses `Munin::Common::Timeout::do_with_timeout`, `Munin::Common::Logger`, and `Munin::Node::OS->run_as_child` for daemon logging, timeouts, and plugin subprocess handling.
I followed the saved plan and made no source change. This area is timing/throttling-sensitive, and the local reproduction was blocked before it could confirm a failing behavior. The expected effect of leaving no diff is to avoid an upstream patch that would add arbitrary sleeps or alter daemon timing without evidence that Munin is actually spinning.
## Git Add Paths
None
## Validation
`make` failed from the workspace root because the build dependency `Module::Build` is missing:
`Can't locate Module/Build.pm in @INC ... at Build.PL line 80.`
`make check` failed because this tree has no `check` target:
`make: *** No rule to make target 'check'. Stop.`
Focused checks run after the project-level build blocker:
`perl -Ilib -c lib/Munin/Node/Server.pm` passed.
`perl -T -Ilib -c script/munin-node` passed.
Independent reproduction attempt:
`timeout 5 strace -ttT -f -e trace=pselect6,select,poll,ppoll /usr/bin/perl -Ilib -T script/munin-node --foreground --config t/config/munin-node.conf` could not run because ptrace is blocked in the sandbox: `PTRACE_TRACEME: Operation not permitted` / `ptrace(PTRACE_SEIZE, 5): Operation not permitted`.
A direct foreground smoke run with an absolute test config exited with status 1 and no output; it did not reproduce the collected poll signal.
## Review Pass 1
RESULT: ok
The first patch pass leaves no source diff, which is appropriate for the evidence level. The workspace is clean, `## Evidence Confidence` is valid, and the author does not claim reproduction.
The diagnosis is consistent with the bundle: `strace` shows timed `pselect6` waits of about 1.8-2.0 seconds, `/proc` reports the process sleeping, and CPU was only `0.9%`. The author also inspected the Perl entrypoint and relevant Munin node/server helpers instead of treating `/usr/bin/perl` as the component to patch.
Validation reporting is acceptable: project-level `make` was attempted and blocked by missing `Module::Build`, `make check` was attempted and does not exist, focused syntax checks were run, and the independent `strace` reproduction was explicitly blocked by sandbox ptrace restrictions.perl likely remains stuck in a busy-poll loop. A diagnosis report and patch proposal were created locally.
## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.
## Patch Pass
You are working on a bounded fixer proposal.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Produce the smallest reasonable patch for the target repository, keep the change upstreamable, prefer the clearest control flow available, and do not keep avoidable `goto` when a simpler structure would read better. Before introducing new file, process, allocation, locking, networking, or platform APIs, inspect nearby code and project contribution docs for existing helpers or compatibility wrappers and use those local patterns unless you can explain why they do not fit. Validate from a reproducible workspace-root entrypoint before falling back to focused leaf commands; if a build or test cannot run, report the exact command, the exact blocker, and any narrower check you ran instead. During validation, also try one bounded independent reproduction of the collected failure signal when it is safe and cheap, such as a failing test, smoke command, perf/strace comparison, or before/after runtime check. Only use `reproduced` if that command or test actually reproduced the failure; otherwise keep `observed` and report the reproduction blocker. The final explanation must connect the observed issue evidence to the actual code change, not just paraphrase the diff. Write like a maintainer is going to read the patch mail cold: explain the bug in plain language, define subsystem-specific jargon the first time you need it, and make the causal story obvious. Explicitly classify evidence confidence as `reproduced`, `observed`, or `inferred`: `reproduced` means you reproduced the failure locally; `observed` means Fixer has direct crash/log/trace evidence but you did not independently reproduce it; `inferred` means the source patch is not pull-request-ready, so do not leave a source diff unless you first gather stronger observed/reproduced evidence; otherwise return a no-patch diagnosis/report. For any source-changing `observed` patch, say explicitly in `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. Security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior need reproduced evidence plus explicit security-impact analysis before leaving a source diff; otherwise return a no-patch diagnosis/report for human review. If you introduce non-obvious state translation, index remapping, or backend split logic, add a short source comment that explains the invariant being preserved.
Start by explaining the likely root cause from the collected perf, strace, and /proc evidence. If you cannot land a safe patch, leave a diagnosis that is strong enough for an upstream bug report.
Interpreter process expectation: when the hot process is Python, Perl, shell, Node, Ruby, PHP, Lua, or another interpreter, inspect both the runtime and the script/application entrypoint from `details.interpreter_process`. Prefer the script or application package when evidence points there; do not patch the interpreter runtime merely because the hot binary is `python`, `perl`, `bash`, or similar. Runtime fixes are welcome only after checking the entrypoint and explaining why the runtime mishandles the workload or why running bad code faster/safer is itself the right upstream fix.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Keep the change narrowly scoped and summarize validation clearly.
In every authoring pass, your final response must start with `Subject: <single-line git commit subject>` and then include these markdown sections exactly:
## Commit Message
A short upstream-friendly explanation of what changed and why. Write it in plain language that a maintainer can follow without local complaint context. If you use subsystem jargon, define it immediately.
## Evidence Confidence
Exactly one word: `reproduced`, `observed`, or `inferred`. Use `reproduced` only when you reproduced the failure locally with a command or test, and include that command/test in `## Validation`. Use `observed` when Fixer has direct crash/log/trace evidence but you did not independently reproduce it. If `## Git Add Paths` lists source files for an `observed` patch, `## Issue Connection` must explicitly say the failure was observed by Fixer and not independently reproduced. Security-sensitive source changes touching authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior require reproduced evidence and explicit security-impact analysis; otherwise list `None` under `## Git Add Paths` and write a no-patch diagnosis/report. Use `inferred` for profiler/strace/indirect evidence; inferred responses may be no-patch diagnoses or reports, but inferred source patches are not pull-request-ready until stronger evidence is gathered.
## Issue Connection
Write this as maintainer-facing patch mail, not as local Fixer notes. Cover four things explicitly in readable sentences: the user-visible symptom or the exact collected signal, the code-level cause or the cautious inference from evidence, the specific change you made, and the expected effect. Do not invent a reproducer, command line, crash, or user-visible failure that is not present in the evidence bundle. If the evidence is direct-but-not-reproduced, say it was observed by Fixer and not independently reproduced. If the evidence is indirect and you did not gather stronger evidence, do not leave a source diff; write a no-patch diagnosis/report instead. Include an explicit effect sentence such as `The expected effect is ...`, `This should reduce ...`, or `This prevents ...` for source patches. If the logic is non-obvious in code, mention that you added a short explanatory comment.
## Git Add Paths
List the repo-relative paths that belong in the final patch, one per line. Use `None` only when you intentionally made no source changes. Include intentionally new files, and do not list generated build artifacts.
## Validation
List the checks you ran, or say clearly that you could not run them. Include the independent reproduction command/test and result when `## Evidence Confidence` is `reproduced`; if reproduction was attempted but blocked, name the exact blocker and keep confidence at `observed` or `inferred`.
Before editing, read the plan at `./plan-output.txt` and follow it unless the code proves part of it wrong. If you change course, say so explicitly in the final write-up instead of silently drifting from the plan.
## Review Pass 1
You are reviewing a freshly generated fixer patch.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Review the first patch pass. The original pre-edit snapshot is available at `./source` for diffing.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout. The latest author response is at `./patch-output.txt`. Inspect the current code and changed paths like a strict code reviewer. Focus on correctness, regressions, maintainability, awkward control flow such as avoidable `goto`, missing validation, weak or non-gittable commit message text, and explanations that fail to connect the observed issue evidence to the code change. Also review the maintainer experience: the patch mail should be easy to accept upstream, the user-visible bug should be explained in plain language, subsystem-specific jargon should be defined when first used, and any non-obvious state translation or index remapping in code should have a short explanatory comment. Reject patches that omit `## Evidence Confidence`, use anything other than `reproduced`, `observed`, or `inferred`, or sound more certain than that evidence level allows. Reject patches that claim `reproduced` unless `## Validation` names the concrete reproduction command or test and its result. Reject source patches in security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior unless the author reproduced the behavior and explicitly analyzed the security impact of the change; observed-only evidence should become a diagnosis/report, not a PR-ready source diff. Reject patches that invent a reproducer, command line, crash, or user-visible failure not present in the evidence bundle; indirect profiler or strace evidence may justify a cautious mitigation, but the author must say it is indirect instead of presenting it as a confirmed upstream bug. Reject patches that introduce generic libc/std APIs when nearby code or project docs provide a local compat/helper API for the same job, unless the author explicitly justifies the exception. Reject validation that only reports a leaf object/syntax build when a project-level configure/build/test entrypoint exists and was not attempted; if a full build cannot run, the author must show the exact failed command and blocker.
Do not apply code changes in this pass.
Return a short markdown review report. The first non-empty line must be exactly one of:
RESULT: ok
RESULT: fix-needed
If you choose `RESULT: fix-needed`, add a `## Findings` section with concrete, actionable items.## Plan Pass
## Problem
Fixer flagged `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` as a likely busy poll loop, but the retained evidence does not prove an application-level runaway. The captured `strace` shows `pselect6` calls blocking for about 1.8-2.0 seconds, process state was `S (sleeping)`, and sampled CPU was only `0.9%`.
## Evidence Confidence
observed
## Proposed Subject
No source patch: classify the captured `munin-node` signal as insufficient for an upstream busy-loop fix
## Patch Plan
Do not edit source in this pass. The evidence points at the `munin-node` script entrypoint and `Munin::Node::Server`, but the sampled syscall behavior looks like normal Net::Server idle waiting rather than a tight loop.
Relevant conventions found: `CONTRIBUTING.md` points to `HACKING.pod`; Perl code should use `strict`, `warnings`, taint-compatible style, existing logging via `Munin::Common::Logger`, and timeout handling via `Munin::Common::Timeout::do_with_timeout`. Nearby node helpers include `Munin::Node::OS->run_as_child` for plugin subprocesses. No relevant prior Fixer patch was found; existing Debian patches are unrelated.
A source patch would be blocked unless additional evidence shows rapid zero-timeout polling, a Perl-level stack tied to `Munin::Node::Server` or `Munin::Node::OS`, or a reproducible node configuration that causes CPU spin. Avoid speculative control-flow changes such as adding sleeps or `goto`-style exits.
## Risks
Adding a throttling or sleep change without reproduction could regress connection latency or mask real plugin hangs. Since this area affects daemon timing behavior, treat any future source change as timing-sensitive and require a concrete reproduction plus impact analysis first.
## Validation
Before any focused check, try the project entrypoints from the workspace root: `make`, then `make test` because there is no `make check` target.
For bounded independent evidence collection, run a local foreground `munin-node` under `strace -ttT -e trace=pselect6,select,poll,ppoll` with a short `timeout`, using generated/build artifacts if needed. Only claim `reproduced` if that shows rapid non-blocking poll/select calls or sustained CPU; otherwise report this as an observed Fixer signal not independently reproduced.
## Patch Pass
Subject: No patch: report munin-node poll evidence as inconclusive
## Commit Message
No source change was made. The collected signal points at `munin-node`, but the retained `strace` and `/proc` data show a sleeping daemon blocked in timed `pselect6` calls, not a reproduced busy loop. A timing or throttling change would be unsafe without a local reproduction showing rapid non-blocking polling or sustained CPU use.
## Evidence Confidence
observed
## Issue Connection
Fixer observed `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` with native Perl frames and repeated poll-family syscalls. The concrete trace contains only three `pselect6` calls over five seconds, each blocking for about 1.8 to 2.0 seconds, while `/proc` showed state `S (sleeping)` and the sampled process CPU was `0.9%`.
The cautious code-level inference is that this is likely the normal idle wait in Munin’s `Net::Server::Fork`-based node daemon, not a proven tight polling loop. The entrypoint is `script/munin-node`, which hands off to `Munin::Node::Server->run`; nearby code already uses `Munin::Common::Timeout::do_with_timeout`, `Munin::Common::Logger`, and `Munin::Node::OS->run_as_child` for daemon logging, timeouts, and plugin subprocess handling.
I followed the saved plan and made no source change. This area is timing/throttling-sensitive, and the local reproduction was blocked before it could confirm a failing behavior. The expected effect of leaving no diff is to avoid an upstream patch that would add arbitrary sleeps or alter daemon timing without evidence that Munin is actually spinning.
## Git Add Paths
None
## Validation
`make` failed from the workspace root because the build dependency `Module::Build` is missing:
`Can't locate Module/Build.pm in @INC ... at Build.PL line 80.`
`make check` failed because this tree has no `check` target:
`make: *** No rule to make target 'check'. Stop.`
Focused checks run after the project-level build blocker:
`perl -Ilib -c lib/Munin/Node/Server.pm` passed.
`perl -T -Ilib -c script/munin-node` passed.
Independent reproduction attempt:
`timeout 5 strace -ttT -f -e trace=pselect6,select,poll,ppoll /usr/bin/perl -Ilib -T script/munin-node --foreground --config t/config/munin-node.conf` could not run because ptrace is blocked in the sandbox: `PTRACE_TRACEME: Operation not permitted` / `ptrace(PTRACE_SEIZE, 5): Operation not permitted`.
A direct foreground smoke run with an absolute test config exited with status 1 and no output; it did not reproduce the collected poll signal.
## Review Pass 1
RESULT: ok
The first patch pass leaves no source diff, which is appropriate for the evidence level. The workspace is clean, `## Evidence Confidence` is valid, and the author does not claim reproduction.
The diagnosis is consistent with the bundle: `strace` shows timed `pselect6` waits of about 1.8-2.0 seconds, `/proc` reports the process sleeping, and CPU was only `0.9%`. The author also inspected the Perl entrypoint and relevant Munin node/server helpers instead of treating `/usr/bin/perl` as the component to patch.
Validation reporting is acceptable: project-level `make` was attempted and blocked by missing `Module::Build`, `make check` was attempted and does not exist, focused syntax checks were run, and the independent `strace` reproduction was explicitly blocked by sandbox ptrace restrictions.perl likely remains stuck in a busy-poll loop. A diagnosis report and patch proposal were created locally.
## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.
## Patch Pass
You are working on a bounded fixer proposal.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Produce the smallest reasonable patch for the target repository, keep the change upstreamable, prefer the clearest control flow available, and do not keep avoidable `goto` when a simpler structure would read better. Before introducing new file, process, allocation, locking, networking, or platform APIs, inspect nearby code and project contribution docs for existing helpers or compatibility wrappers and use those local patterns unless you can explain why they do not fit. Validate from a reproducible workspace-root entrypoint before falling back to focused leaf commands; if a build or test cannot run, report the exact command, the exact blocker, and any narrower check you ran instead. During validation, also try one bounded independent reproduction of the collected failure signal when it is safe and cheap, such as a failing test, smoke command, perf/strace comparison, or before/after runtime check. Only use `reproduced` if that command or test actually reproduced the failure; otherwise keep `observed` and report the reproduction blocker. The final explanation must connect the observed issue evidence to the actual code change, not just paraphrase the diff. Write like a maintainer is going to read the patch mail cold: explain the bug in plain language, define subsystem-specific jargon the first time you need it, and make the causal story obvious. Explicitly classify evidence confidence as `reproduced`, `observed`, or `inferred`: `reproduced` means you reproduced the failure locally; `observed` means Fixer has direct crash/log/trace evidence but you did not independently reproduce it; `inferred` means the source patch is not pull-request-ready, so do not leave a source diff unless you first gather stronger observed/reproduced evidence; otherwise return a no-patch diagnosis/report. For any source-changing `observed` patch, say explicitly in `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. Security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior need reproduced evidence plus explicit security-impact analysis before leaving a source diff; otherwise return a no-patch diagnosis/report for human review. If you introduce non-obvious state translation, index remapping, or backend split logic, add a short source comment that explains the invariant being preserved.
Start by explaining the likely root cause from the collected perf, strace, and /proc evidence. If you cannot land a safe patch, leave a diagnosis that is strong enough for an upstream bug report.
Interpreter process expectation: when the hot process is Python, Perl, shell, Node, Ruby, PHP, Lua, or another interpreter, inspect both the runtime and the script/application entrypoint from `details.interpreter_process`. Prefer the script or application package when evidence points there; do not patch the interpreter runtime merely because the hot binary is `python`, `perl`, `bash`, or similar. Runtime fixes are welcome only after checking the entrypoint and explaining why the runtime mishandles the workload or why running bad code faster/safer is itself the right upstream fix.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Keep the change narrowly scoped and summarize validation clearly.
In every authoring pass, your final response must start with `Subject: <single-line git commit subject>` and then include these markdown sections exactly:
## Commit Message
A short upstream-friendly explanation of what changed and why. Write it in plain language that a maintainer can follow without local complaint context. If you use subsystem jargon, define it immediately.
## Evidence Confidence
Exactly one word: `reproduced`, `observed`, or `inferred`. Use `reproduced` only when you reproduced the failure locally with a command or test, and include that command/test in `## Validation`. Use `observed` when Fixer has direct crash/log/trace evidence but you did not independently reproduce it. If `## Git Add Paths` lists source files for an `observed` patch, `## Issue Connection` must explicitly say the failure was observed by Fixer and not independently reproduced. Security-sensitive source changes touching authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior require reproduced evidence and explicit security-impact analysis; otherwise list `None` under `## Git Add Paths` and write a no-patch diagnosis/report. Use `inferred` for profiler/strace/indirect evidence; inferred responses may be no-patch diagnoses or reports, but inferred source patches are not pull-request-ready until stronger evidence is gathered.
## Issue Connection
Write this as maintainer-facing patch mail, not as local Fixer notes. Cover four things explicitly in readable sentences: the user-visible symptom or the exact collected signal, the code-level cause or the cautious inference from evidence, the specific change you made, and the expected effect. Do not invent a reproducer, command line, crash, or user-visible failure that is not present in the evidence bundle. If the evidence is direct-but-not-reproduced, say it was observed by Fixer and not independently reproduced. If the evidence is indirect and you did not gather stronger evidence, do not leave a source diff; write a no-patch diagnosis/report instead. Include an explicit effect sentence such as `The expected effect is ...`, `This should reduce ...`, or `This prevents ...` for source patches. If the logic is non-obvious in code, mention that you added a short explanatory comment.
## Git Add Paths
List the repo-relative paths that belong in the final patch, one per line. Use `None` only when you intentionally made no source changes. Include intentionally new files, and do not list generated build artifacts.
## Validation
List the checks you ran, or say clearly that you could not run them. Include the independent reproduction command/test and result when `## Evidence Confidence` is `reproduced`; if reproduction was attempted but blocked, name the exact blocker and keep confidence at `observed` or `inferred`.
Before editing, read the plan at `./plan-output.txt` and follow it unless the code proves part of it wrong. If you change course, say so explicitly in the final write-up instead of silently drifting from the plan.
## Review Pass 1
You are reviewing a freshly generated fixer patch.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Review the first patch pass. The original pre-edit snapshot is available at `./source` for diffing.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout. The latest author response is at `./patch-output.txt`. Inspect the current code and changed paths like a strict code reviewer. Focus on correctness, regressions, maintainability, awkward control flow such as avoidable `goto`, missing validation, weak or non-gittable commit message text, and explanations that fail to connect the observed issue evidence to the code change. Also review the maintainer experience: the patch mail should be easy to accept upstream, the user-visible bug should be explained in plain language, subsystem-specific jargon should be defined when first used, and any non-obvious state translation or index remapping in code should have a short explanatory comment. Reject patches that omit `## Evidence Confidence`, use anything other than `reproduced`, `observed`, or `inferred`, or sound more certain than that evidence level allows. Reject patches that claim `reproduced` unless `## Validation` names the concrete reproduction command or test and its result. Reject source patches in security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior unless the author reproduced the behavior and explicitly analyzed the security impact of the change; observed-only evidence should become a diagnosis/report, not a PR-ready source diff. Reject patches that invent a reproducer, command line, crash, or user-visible failure not present in the evidence bundle; indirect profiler or strace evidence may justify a cautious mitigation, but the author must say it is indirect instead of presenting it as a confirmed upstream bug. Reject patches that introduce generic libc/std APIs when nearby code or project docs provide a local compat/helper API for the same job, unless the author explicitly justifies the exception. Reject validation that only reports a leaf object/syntax build when a project-level configure/build/test entrypoint exists and was not attempted; if a full build cannot run, the author must show the exact failed command and blocker.
Do not apply code changes in this pass.
Return a short markdown review report. The first non-empty line must be exactly one of:
RESULT: ok
RESULT: fix-needed
If you choose `RESULT: fix-needed`, add a `## Findings` section with concrete, actionable items.## Plan Pass
## Problem
Fixer observed `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` repeatedly in `pselect6`, but the retained evidence is profiler/strace-level only. The process was sleeping, CPU was low at about `0.9%`, and strace showed timed waits of about `1.8s` and `2.0s`, so this does not yet prove a runaway application loop or a Perl runtime defect.
## Evidence Confidence
observed
## Proposed Subject
No source patch yet: diagnose `munin-node` idle/select behavior before changing timing-sensitive server code.
## Patch Plan
Do not edit in this pass. The likely code path is `script/munin-node` -> `Munin::Node::Server->run` -> `Munin::Node::Server::process_request` -> `_net_read`, with the existing local helper `Munin::Common::Timeout::do_with_timeout` wrapping whole request handling.
Before proposing a source patch, collect a bounded reproduction tying the observed `pselect6` loop to a Perl-level call path. If reproduction shows the node waiting normally in Net::Server or blocking on master input, close as no patch/report. If reproduction shows repeated near-zero-time reads or signal interruptions, plan a narrowly scoped fix in `lib/Munin/Node/Server.pm`, using existing `do_with_timeout`, `Munin::Common::Logger`, and current Perl style. Avoid awkward control flow such as a new `goto`; use a bounded loop or helper instead.
No prior Fixer patch was present in the workspace (`git diff` was empty), so there is nothing to replace.
## Risks
Changing this area affects connection lifetime and timeout behavior, which is timing-sensitive and could affect availability for slow masters or TLS sessions. A source patch is blocked until reproduction demonstrates harmful behavior and the security/availability impact is understood.
## Validation
Project-level validation attempted from workspace root:
`make` failed because `Module::Build` is missing:
`Can't locate Module/Build.pm in @INC ... at Build.PL line 80`
`make check` failed because no `check` target exists:
`make: *** No rule to make target 'check'. Stop.`
Focused fallback checks already pass:
`perl -Ilib -c lib/Munin/Node/Server.pm`
`perl -Ilib -c lib/Munin/Common/Timeout.pm`
`perl -Ilib -c lib/Munin/Node/Session.pm`
`perl -T -Ilib -c script/munin-node`
Next bounded reproduction before any edit: run a foreground `munin-node` under short `strace -ttT -f -e trace=pselect6,select,poll,ppoll,nanosleep,clock_nanosleep`, then capture a Perl-level stack or debug trace if the loop appears with near-zero blocking.
## Patch Pass
Subject: Diagnose munin-node pselect profile without code change
## Commit Message
The collected evidence most likely shows `munin-node` sleeping in a timed `select`/`pselect6` wait, not a proven busy spin. `/proc` reported the process as sleeping in `poll_schedule_timeout`, and strace showed waits lasting about 1.8-2.0 seconds. That points toward the Perl entrypoint’s Net::Server request loop or timeout machinery, but the bundle lacks a Perl-level stack tying the samples to a faulty Munin source line.
No source patch is left because this touches connection timing behavior and the failure could not be reproduced or isolated locally.
## Evidence Confidence
inferred
## Issue Connection
Fixer collected perf, strace, native backtrace, and `/proc` evidence for `/usr/bin/perl -wT /usr/sbin/munin-node --foreground`. The exact signal was repeated `pselect6` around a sleeping `munin-node` process, with the kernel wait channel `poll_schedule_timeout`.
The cautious code-level inference is that the hot binary is Perl only because `munin-node` is a Perl script. I inspected the script entrypoint and the relevant application path in `script/munin-node` and `lib/Munin/Node/Server.pm`; request handling is implemented through `Net::Server::Fork`, `_net_read`, and the local timeout helper `Munin::Common::Timeout::do_with_timeout`, with logging through `Munin::Common::Logger`. I also checked the Perl runtime version present locally, but there is no evidence that Perl itself mishandled this workload.
I made no source change. The planned change would have affected connection timing/throttling behavior, and the evidence is profiler/strace-level only: it does not show a near-zero timeout loop, repeated immediate read failures, or a Perl-level stack identifying a faulty Munin call site. The expected effect of leaving no diff is to avoid an upstream patch that could change valid slow-client or TLS session behavior without a reproduced defect.
This follows the saved plan: gather stronger evidence first, and stop with a diagnosis if the local reproduction cannot confirm harmful behavior.
## Git Add Paths
None
## Validation
Project-level entrypoints from the workspace root:
`make` failed before build/test because `Module::Build` is missing:
`Can't locate Module/Build.pm in @INC ... at Build.PL line 80`
`make: *** [Makefile:149: Build] Error 2`
`make check` failed because the target is not defined:
`make: *** No rule to make target 'check'. Stop.`
Focused checks run instead:
`perl -Ilib -c lib/Munin/Node/Server.pm`
Result: syntax OK.
`perl -Ilib -c lib/Munin/Common/Timeout.pm`
Result: syntax OK.
`perl -Ilib -c lib/Munin/Node/Session.pm`
Result: syntax OK.
`perl -T -Ilib -c script/munin-node`
Result: syntax OK.
Bounded reproduction attempts:
`timeout 8s strace -ttT -f -e trace=pselect6,select,poll,ppoll,epoll_wait,nanosleep,clock_nanosleep ... script/munin-node ...`
Blocked by sandbox ptrace restrictions:
`PTRACE_TRACEME: Operation not permitted`
`ptrace(PTRACE_SEIZE, 7): Operation not permitted`
Plain foreground smoke with a temporary config was also blocked because the sandbox does not permit binding the test TCP listener:
`Cannot bind and listen to TCP port 14949 on 127.0.0.1 [Operation not permitted]`
## Review Pass 1
RESULT: ok
No source diff is present, which matches the evidence level and the timing-sensitive nature of the suspected area. The author inspected the Perl entrypoint and `munin-node` server path, named relevant local helpers (`Munin::Common::Timeout::do_with_timeout`, `Munin::Common::Logger`, `Net::Server::Fork`), avoided inventing a confirmed bug, and kept the response as a diagnosis/report.
Validation is acceptable for a no-patch pass: `make` and `make check` were attempted with exact blockers, focused Perl syntax checks were run, and bounded reproduction attempts were reported with sandbox blockers (`ptrace` and TCP bind permissions).perl likely remains stuck in a busy-poll loop. A diagnosis report and patch proposal were created locally.
## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.
## Patch Pass
You are working on a bounded fixer proposal.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Produce the smallest reasonable patch for the target repository, keep the change upstreamable, prefer the clearest control flow available, and do not keep avoidable `goto` when a simpler structure would read better. Before introducing new file, process, allocation, locking, networking, or platform APIs, inspect nearby code and project contribution docs for existing helpers or compatibility wrappers and use those local patterns unless you can explain why they do not fit. Validate from a reproducible workspace-root entrypoint before falling back to focused leaf commands; if a build or test cannot run, report the exact command, the exact blocker, and any narrower check you ran instead. During validation, also try one bounded independent reproduction of the collected failure signal when it is safe and cheap, such as a failing test, smoke command, perf/strace comparison, or before/after runtime check. Only use `reproduced` if that command or test actually reproduced the failure; otherwise keep `observed` and report the reproduction blocker. The final explanation must connect the observed issue evidence to the actual code change, not just paraphrase the diff. Write like a maintainer is going to read the patch mail cold: explain the bug in plain language, define subsystem-specific jargon the first time you need it, and make the causal story obvious. Explicitly classify evidence confidence as `reproduced`, `observed`, or `inferred`: `reproduced` means you reproduced the failure locally; `observed` means Fixer has direct crash/log/trace evidence but you did not independently reproduce it; `inferred` means the source patch is not pull-request-ready, so do not leave a source diff unless you first gather stronger observed/reproduced evidence; otherwise return a no-patch diagnosis/report. For any source-changing `observed` patch, say explicitly in `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. Security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior need reproduced evidence plus explicit security-impact analysis before leaving a source diff; otherwise return a no-patch diagnosis/report for human review. If you introduce non-obvious state translation, index remapping, or backend split logic, add a short source comment that explains the invariant being preserved.
Start by explaining the likely root cause from the collected perf, strace, and /proc evidence. If you cannot land a safe patch, leave a diagnosis that is strong enough for an upstream bug report.
Interpreter process expectation: when the hot process is Python, Perl, shell, Node, Ruby, PHP, Lua, or another interpreter, inspect both the runtime and the script/application entrypoint from `details.interpreter_process`. Prefer the script or application package when evidence points there; do not patch the interpreter runtime merely because the hot binary is `python`, `perl`, `bash`, or similar. Runtime fixes are welcome only after checking the entrypoint and explaining why the runtime mishandles the workload or why running bad code faster/safer is itself the right upstream fix.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Keep the change narrowly scoped and summarize validation clearly.
In every authoring pass, your final response must start with `Subject: <single-line git commit subject>` and then include these markdown sections exactly:
## Commit Message
A short upstream-friendly explanation of what changed and why. Write it in plain language that a maintainer can follow without local complaint context. If you use subsystem jargon, define it immediately.
## Evidence Confidence
Exactly one word: `reproduced`, `observed`, or `inferred`. Use `reproduced` only when you reproduced the failure locally with a command or test, and include that command/test in `## Validation`. Use `observed` when Fixer has direct crash/log/trace evidence but you did not independently reproduce it. If `## Git Add Paths` lists source files for an `observed` patch, `## Issue Connection` must explicitly say the failure was observed by Fixer and not independently reproduced. Security-sensitive source changes touching authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior require reproduced evidence and explicit security-impact analysis; otherwise list `None` under `## Git Add Paths` and write a no-patch diagnosis/report. Use `inferred` for profiler/strace/indirect evidence; inferred responses may be no-patch diagnoses or reports, but inferred source patches are not pull-request-ready until stronger evidence is gathered.
## Issue Connection
Write this as maintainer-facing patch mail, not as local Fixer notes. Cover four things explicitly in readable sentences: the user-visible symptom or the exact collected signal, the code-level cause or the cautious inference from evidence, the specific change you made, and the expected effect. Do not invent a reproducer, command line, crash, or user-visible failure that is not present in the evidence bundle. If the evidence is direct-but-not-reproduced, say it was observed by Fixer and not independently reproduced. If the evidence is indirect and you did not gather stronger evidence, do not leave a source diff; write a no-patch diagnosis/report instead. Include an explicit effect sentence such as `The expected effect is ...`, `This should reduce ...`, or `This prevents ...` for source patches. If the logic is non-obvious in code, mention that you added a short explanatory comment.
## Git Add Paths
List the repo-relative paths that belong in the final patch, one per line. Use `None` only when you intentionally made no source changes. Include intentionally new files, and do not list generated build artifacts.
## Validation
List the checks you ran, or say clearly that you could not run them. Include the independent reproduction command/test and result when `## Evidence Confidence` is `reproduced`; if reproduction was attempted but blocked, name the exact blocker and keep confidence at `observed` or `inferred`.
Before editing, read the plan at `./plan-output.txt` and follow it unless the code proves part of it wrong. If you change course, say so explicitly in the final write-up instead of silently drifting from the plan.
## Review Pass 1
You are reviewing a freshly generated fixer patch.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Review the first patch pass. The original pre-edit snapshot is available at `./source` for diffing.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout. The latest author response is at `./patch-output.txt`. Inspect the current code and changed paths like a strict code reviewer. Focus on correctness, regressions, maintainability, awkward control flow such as avoidable `goto`, missing validation, weak or non-gittable commit message text, and explanations that fail to connect the observed issue evidence to the code change. Also review the maintainer experience: the patch mail should be easy to accept upstream, the user-visible bug should be explained in plain language, subsystem-specific jargon should be defined when first used, and any non-obvious state translation or index remapping in code should have a short explanatory comment. Reject patches that omit `## Evidence Confidence`, use anything other than `reproduced`, `observed`, or `inferred`, or sound more certain than that evidence level allows. Reject patches that claim `reproduced` unless `## Validation` names the concrete reproduction command or test and its result. Reject source patches in security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior unless the author reproduced the behavior and explicitly analyzed the security impact of the change; observed-only evidence should become a diagnosis/report, not a PR-ready source diff. Reject patches that invent a reproducer, command line, crash, or user-visible failure not present in the evidence bundle; indirect profiler or strace evidence may justify a cautious mitigation, but the author must say it is indirect instead of presenting it as a confirmed upstream bug. Reject patches that introduce generic libc/std APIs when nearby code or project docs provide a local compat/helper API for the same job, unless the author explicitly justifies the exception. Reject validation that only reports a leaf object/syntax build when a project-level configure/build/test entrypoint exists and was not attempted; if a full build cannot run, the author must show the exact failed command and blocker.
Do not apply code changes in this pass.
Return a short markdown review report. The first non-empty line must be exactly one of:
RESULT: ok
RESULT: fix-needed
If you choose `RESULT: fix-needed`, add a `## Findings` section with concrete, actionable items.## Plan Pass
## Problem
Fixer observed `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` repeatedly in `pselect6`, but the retained evidence is profiler/strace-level only. The process was sleeping, CPU was low at about `0.9%`, and strace showed timed waits of about `1.8s` and `2.0s`, so this does not yet prove a runaway application loop or a Perl runtime defect.
## Evidence Confidence
observed
## Proposed Subject
No source patch yet: diagnose `munin-node` idle/select behavior before changing timing-sensitive server code.
## Patch Plan
Do not edit in this pass. The likely code path is `script/munin-node` -> `Munin::Node::Server->run` -> `Munin::Node::Server::process_request` -> `_net_read`, with the existing local helper `Munin::Common::Timeout::do_with_timeout` wrapping whole request handling.
Before proposing a source patch, collect a bounded reproduction tying the observed `pselect6` loop to a Perl-level call path. If reproduction shows the node waiting normally in Net::Server or blocking on master input, close as no patch/report. If reproduction shows repeated near-zero-time reads or signal interruptions, plan a narrowly scoped fix in `lib/Munin/Node/Server.pm`, using existing `do_with_timeout`, `Munin::Common::Logger`, and current Perl style. Avoid awkward control flow such as a new `goto`; use a bounded loop or helper instead.
No prior Fixer patch was present in the workspace (`git diff` was empty), so there is nothing to replace.
## Risks
Changing this area affects connection lifetime and timeout behavior, which is timing-sensitive and could affect availability for slow masters or TLS sessions. A source patch is blocked until reproduction demonstrates harmful behavior and the security/availability impact is understood.
## Validation
Project-level validation attempted from workspace root:
`make` failed because `Module::Build` is missing:
`Can't locate Module/Build.pm in @INC ... at Build.PL line 80`
`make check` failed because no `check` target exists:
`make: *** No rule to make target 'check'. Stop.`
Focused fallback checks already pass:
`perl -Ilib -c lib/Munin/Node/Server.pm`
`perl -Ilib -c lib/Munin/Common/Timeout.pm`
`perl -Ilib -c lib/Munin/Node/Session.pm`
`perl -T -Ilib -c script/munin-node`
Next bounded reproduction before any edit: run a foreground `munin-node` under short `strace -ttT -f -e trace=pselect6,select,poll,ppoll,nanosleep,clock_nanosleep`, then capture a Perl-level stack or debug trace if the loop appears with near-zero blocking.
## Patch Pass
Subject: Diagnose munin-node pselect profile without code change
## Commit Message
The collected evidence most likely shows `munin-node` sleeping in a timed `select`/`pselect6` wait, not a proven busy spin. `/proc` reported the process as sleeping in `poll_schedule_timeout`, and strace showed waits lasting about 1.8-2.0 seconds. That points toward the Perl entrypoint’s Net::Server request loop or timeout machinery, but the bundle lacks a Perl-level stack tying the samples to a faulty Munin source line.
No source patch is left because this touches connection timing behavior and the failure could not be reproduced or isolated locally.
## Evidence Confidence
inferred
## Issue Connection
Fixer collected perf, strace, native backtrace, and `/proc` evidence for `/usr/bin/perl -wT /usr/sbin/munin-node --foreground`. The exact signal was repeated `pselect6` around a sleeping `munin-node` process, with the kernel wait channel `poll_schedule_timeout`.
The cautious code-level inference is that the hot binary is Perl only because `munin-node` is a Perl script. I inspected the script entrypoint and the relevant application path in `script/munin-node` and `lib/Munin/Node/Server.pm`; request handling is implemented through `Net::Server::Fork`, `_net_read`, and the local timeout helper `Munin::Common::Timeout::do_with_timeout`, with logging through `Munin::Common::Logger`. I also checked the Perl runtime version present locally, but there is no evidence that Perl itself mishandled this workload.
I made no source change. The planned change would have affected connection timing/throttling behavior, and the evidence is profiler/strace-level only: it does not show a near-zero timeout loop, repeated immediate read failures, or a Perl-level stack identifying a faulty Munin call site. The expected effect of leaving no diff is to avoid an upstream patch that could change valid slow-client or TLS session behavior without a reproduced defect.
This follows the saved plan: gather stronger evidence first, and stop with a diagnosis if the local reproduction cannot confirm harmful behavior.
## Git Add Paths
None
## Validation
Project-level entrypoints from the workspace root:
`make` failed before build/test because `Module::Build` is missing:
`Can't locate Module/Build.pm in @INC ... at Build.PL line 80`
`make: *** [Makefile:149: Build] Error 2`
`make check` failed because the target is not defined:
`make: *** No rule to make target 'check'. Stop.`
Focused checks run instead:
`perl -Ilib -c lib/Munin/Node/Server.pm`
Result: syntax OK.
`perl -Ilib -c lib/Munin/Common/Timeout.pm`
Result: syntax OK.
`perl -Ilib -c lib/Munin/Node/Session.pm`
Result: syntax OK.
`perl -T -Ilib -c script/munin-node`
Result: syntax OK.
Bounded reproduction attempts:
`timeout 8s strace -ttT -f -e trace=pselect6,select,poll,ppoll,epoll_wait,nanosleep,clock_nanosleep ... script/munin-node ...`
Blocked by sandbox ptrace restrictions:
`PTRACE_TRACEME: Operation not permitted`
`ptrace(PTRACE_SEIZE, 7): Operation not permitted`
Plain foreground smoke with a temporary config was also blocked because the sandbox does not permit binding the test TCP listener:
`Cannot bind and listen to TCP port 14949 on 127.0.0.1 [Operation not permitted]`
## Review Pass 1
RESULT: ok
No source diff is present, which matches the evidence level and the timing-sensitive nature of the suspected area. The author inspected the Perl entrypoint and `munin-node` server path, named relevant local helpers (`Munin::Common::Timeout::do_with_timeout`, `Munin::Common::Logger`, `Net::Server::Fork`), avoided inventing a confirmed bug, and kept the response as a diagnosis/report.
Validation is acceptable for a no-patch pass: `make` and `make check` were attempted with exact blockers, focused Perl syntax checks were run, and bounded reproduction attempts were reported with sandbox blockers (`ptrace` and TCP bind permissions).perl likely remains stuck in a busy-poll loop. A diagnosis report and patch proposal were created locally.
## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.
## Patch Pass
You are working on a bounded fixer proposal.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Produce the smallest reasonable patch for the target repository, keep the change upstreamable, prefer the clearest control flow available, and do not keep avoidable `goto` when a simpler structure would read better. Before introducing new file, process, allocation, locking, networking, or platform APIs, inspect nearby code and project contribution docs for existing helpers or compatibility wrappers and use those local patterns unless you can explain why they do not fit. Validate from a reproducible workspace-root entrypoint before falling back to focused leaf commands; if a build or test cannot run, report the exact command, the exact blocker, and any narrower check you ran instead. During validation, also try one bounded independent reproduction of the collected failure signal when it is safe and cheap, such as a failing test, smoke command, perf/strace comparison, or before/after runtime check. Only use `reproduced` if that command or test actually reproduced the failure; otherwise keep `observed` and report the reproduction blocker. The final explanation must connect the observed issue evidence to the actual code change, not just paraphrase the diff. Write like a maintainer is going to read the patch mail cold: explain the bug in plain language, define subsystem-specific jargon the first time you need it, and make the causal story obvious. Explicitly classify evidence confidence as `reproduced`, `observed`, or `inferred`: `reproduced` means you reproduced the failure locally; `observed` means Fixer has direct crash/log/trace evidence but you did not independently reproduce it; `inferred` means the source patch is not pull-request-ready, so do not leave a source diff unless you first gather stronger observed/reproduced evidence; otherwise return a no-patch diagnosis/report. For any source-changing `observed` patch, say explicitly in `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. Security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior need reproduced evidence plus explicit security-impact analysis before leaving a source diff; otherwise return a no-patch diagnosis/report for human review. If you introduce non-obvious state translation, index remapping, or backend split logic, add a short source comment that explains the invariant being preserved.
Start by explaining the likely root cause from the collected perf, strace, and /proc evidence. If you cannot land a safe patch, leave a diagnosis that is strong enough for an upstream bug report.
Interpreter process expectation: when the hot process is Python, Perl, shell, Node, Ruby, PHP, Lua, or another interpreter, inspect both the runtime and the script/application entrypoint from `details.interpreter_process`. Prefer the script or application package when evidence points there; do not patch the interpreter runtime merely because the hot binary is `python`, `perl`, `bash`, or similar. Runtime fixes are welcome only after checking the entrypoint and explaining why the runtime mishandles the workload or why running bad code faster/safer is itself the right upstream fix.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Keep the change narrowly scoped and summarize validation clearly.
In every authoring pass, your final response must start with `Subject: <single-line git commit subject>` and then include these markdown sections exactly:
## Commit Message
A short upstream-friendly explanation of what changed and why. Write it in plain language that a maintainer can follow without local complaint context. If you use subsystem jargon, define it immediately.
## Evidence Confidence
Exactly one word: `reproduced`, `observed`, or `inferred`. Use `reproduced` only when you reproduced the failure locally with a command or test, and include that command/test in `## Validation`. Use `observed` when Fixer has direct crash/log/trace evidence but you did not independently reproduce it. If `## Git Add Paths` lists source files for an `observed` patch, `## Issue Connection` must explicitly say the failure was observed by Fixer and not independently reproduced. Security-sensitive source changes touching authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior require reproduced evidence and explicit security-impact analysis; otherwise list `None` under `## Git Add Paths` and write a no-patch diagnosis/report. Use `inferred` for profiler/strace/indirect evidence; inferred responses may be no-patch diagnoses or reports, but inferred source patches are not pull-request-ready until stronger evidence is gathered.
## Issue Connection
Write this as maintainer-facing patch mail, not as local Fixer notes. Cover four things explicitly in readable sentences: the user-visible symptom or the exact collected signal, the code-level cause or the cautious inference from evidence, the specific change you made, and the expected effect. Do not invent a reproducer, command line, crash, or user-visible failure that is not present in the evidence bundle. If the evidence is direct-but-not-reproduced, say it was observed by Fixer and not independently reproduced. If the evidence is indirect and you did not gather stronger evidence, do not leave a source diff; write a no-patch diagnosis/report instead. Include an explicit effect sentence such as `The expected effect is ...`, `This should reduce ...`, or `This prevents ...` for source patches. If the logic is non-obvious in code, mention that you added a short explanatory comment.
## Git Add Paths
List the repo-relative paths that belong in the final patch, one per line. Use `None` only when you intentionally made no source changes. Include intentionally new files, and do not list generated build artifacts.
## Validation
List the checks you ran, or say clearly that you could not run them. Include the independent reproduction command/test and result when `## Evidence Confidence` is `reproduced`; if reproduction was attempted but blocked, name the exact blocker and keep confidence at `observed` or `inferred`.
Before editing, read the plan at `./plan-output.txt` and follow it unless the code proves part of it wrong. If you change course, say so explicitly in the final write-up instead of silently drifting from the plan.
## Review Pass 1
You are reviewing a freshly generated fixer patch.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Review the first patch pass. The original pre-edit snapshot is available at `./source` for diffing.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout. The latest author response is at `./patch-output.txt`. Inspect the current code and changed paths like a strict code reviewer. Focus on correctness, regressions, maintainability, awkward control flow such as avoidable `goto`, missing validation, weak or non-gittable commit message text, and explanations that fail to connect the observed issue evidence to the code change. Also review the maintainer experience: the patch mail should be easy to accept upstream, the user-visible bug should be explained in plain language, subsystem-specific jargon should be defined when first used, and any non-obvious state translation or index remapping in code should have a short explanatory comment. Reject patches that omit `## Evidence Confidence`, use anything other than `reproduced`, `observed`, or `inferred`, or sound more certain than that evidence level allows. Reject patches that claim `reproduced` unless `## Validation` names the concrete reproduction command or test and its result. Reject source patches in security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior unless the author reproduced the behavior and explicitly analyzed the security impact of the change; observed-only evidence should become a diagnosis/report, not a PR-ready source diff. Reject patches that invent a reproducer, command line, crash, or user-visible failure not present in the evidence bundle; indirect profiler or strace evidence may justify a cautious mitigation, but the author must say it is indirect instead of presenting it as a confirmed upstream bug. Reject patches that introduce generic libc/std APIs when nearby code or project docs provide a local compat/helper API for the same job, unless the author explicitly justifies the exception. Reject validation that only reports a leaf object/syntax build when a project-level configure/build/test entrypoint exists and was not attempted; if a full build cannot run, the author must show the exact failed command and blocker.
Do not apply code changes in this pass.
Return a short markdown review report. The first non-empty line must be exactly one of:
RESULT: ok
RESULT: fix-needed
If you choose `RESULT: fix-needed`, add a `## Findings` section with concrete, actionable items.## Plan Pass
## Problem
Fixer flagged `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` as a likely busy poll loop, but the retained evidence shows `munin-node` sleeping in `pselect6` with 1.8-2.0 second timeouts and only 0.9% CPU. The Perl-level stack was not retained, and the raw investigation artifacts are not available in this workspace.
## Evidence Confidence
inferred
## Proposed Subject
No source patch: report `munin-node` idle `pselect6` as insufficient evidence for a busy-loop fix
## Patch Plan
Do not edit source in this pass. The observed frames are consistent with `Munin::Node::Server` inheriting `Net::Server::Fork` and waiting for connections, not Munin application code spinning.
If later evidence shows a real wakeup loop, investigate `script/munin-node` first, then `lib/Munin/Node/Server.pm`, following Munin’s conventions from `CONTRIBUTING.md` and `HACKING.pod`: strict/warnings Perl, existing file style, no warnings, and project tests. Prefer local helpers already in this subsystem: `Munin::Common::Timeout::do_with_timeout`, `Munin::Common::Logger`, `Munin::Common::Daemon::emit_sd_notify_message`, `Munin::Node::OS->run_as_child`, and the existing `Net::Server` callback model.
No relevant prior Fixer patch was found. Existing Debian patches are unrelated. No awkward control-flow change such as a `goto` is planned.
## Risks
A source patch based only on this bundle would likely change normal daemon idle behavior. The evidence does not prove a script-level bug, runtime bug, or user-visible failure. This is not security-sensitive as planned because no auth, permission, credential, crypto, sandbox, or throttling behavior would be changed.
## Validation
Before any focused check, try project-level validation from the workspace root: `make`; then `make check` if a check target exists. This Makefile advertises `make test`, so use `make test` if `make check` is unavailable.
For a bounded independent signal check, after building/installing the sandbox, run `./dev_scripts/run munin-node --foreground` under a short `timeout` and `strace -ttT -e trace=pselect6,select,poll,ppoll`. Treat repeated multi-second blocking waits plus low CPU as a non-reproduction of the reported busy loop, not as a fixed bug.
## Patch Pass
Subject: Report inconclusive munin-node select trace
## Commit Message
No source change is included. The collected trace looks like an idle `munin-node` daemon waiting in `select`, not a proven busy loop in Munin code. A patch would risk changing normal daemon behavior without a reproducible failure or a Perl-level stack tied to Munin application logic.
## Evidence Confidence
inferred
## Issue Connection
Fixer collected perf, strace, and `/proc` evidence for `/usr/bin/perl -wT /usr/sbin/munin-node --foreground`: the native stack passed through Perl and `select`, while `/proc` reported the process as sleeping and strace showed `pselect6` calls blocking for about 1.8 to 2.0 seconds. That is an indirect profiler signal, not a confirmed user-visible runaway CPU failure.
The cautious code-level inference is that `script/munin-node` enters `Munin::Node::Server->run`, and `Munin::Node::Server` inherits `Net::Server::Fork`; the sampled `select` is consistent with the server accept loop waiting for work. I inspected the Perl runtime enough to confirm the hot binary is Perl 5.40.1, but the retained evidence points to the script entrypoint and does not show a Perl runtime bug.
I followed the saved plan and left no source diff. Local helpers and conventions found were `Munin::Common::Timeout::do_with_timeout`, `Munin::Common::Logger`, `Munin::Common::Daemon::emit_sd_notify_message`, `Munin::Node::OS->run_as_child`, and the existing `Net::Server` callback model. The expected effect is that upstream does not receive a speculative behavior change based on an idle wait trace.
## Git Add Paths
None
## Validation
`make` failed before building Munin code: `Can't locate Module/Build.pm in @INC` from `Build.PL line 80`.
`make check` failed because there is no `check` target: `make: *** No rule to make target 'check'. Stop.`
`make test` failed with the same missing `Module::Build.pm` blocker.
Narrow checks run:
`perl -Ilib -c lib/Munin/Node/Server.pm` passed.
`perl -T -Ilib -c script/munin-node` passed.
Independent reproduction attempt:
`timeout 8s strace -ttT -f -e trace=pselect6,select,poll,ppoll /usr/bin/perl -wT -Ilib script/munin-node --foreground` was blocked by sandbox ptrace policy: `PTRACE_TRACEME: Operation not permitted`.
A non-ptrace foreground smoke with a temporary high-port config reached `Net::Server::Fork` but could not bind a listener: `Cannot bind and listen to TCP port 14949 on 127.0.0.1 [Operation not permitted]`. The collected busy-loop signal was not reproduced locally.
## Review Pass 1
RESULT: ok
The first patch pass correctly leaves no source diff. `git status` and `git diff` are clean, and `## Git Add Paths` lists `None`.
The author’s `inferred` evidence classification is appropriate: the bundle has indirect perf/strace evidence, `/proc` shows the process sleeping, strace shows multi-second `pselect6` waits, and no local reproduction or Perl-level stack ties the signal to Munin code. The write-up does not overclaim a confirmed upstream bug.
Validation is acceptable for a no-patch diagnosis: project-level `make`, `make check`, and `make test` were attempted with exact blockers, narrower Perl syntax checks were run, and the independent strace/smoke reproduction attempts report concrete sandbox blockers. Contribution docs and local subsystem helpers were named, and no generic API or awkward control-flow change was introduced.perl likely remains stuck in a busy-poll loop. A diagnosis report and patch proposal were created locally.
## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.
## Patch Pass
You are working on a bounded fixer proposal.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Produce the smallest reasonable patch for the target repository, keep the change upstreamable, prefer the clearest control flow available, and do not keep avoidable `goto` when a simpler structure would read better. Before introducing new file, process, allocation, locking, networking, or platform APIs, inspect nearby code and project contribution docs for existing helpers or compatibility wrappers and use those local patterns unless you can explain why they do not fit. Validate from a reproducible workspace-root entrypoint before falling back to focused leaf commands; if a build or test cannot run, report the exact command, the exact blocker, and any narrower check you ran instead. During validation, also try one bounded independent reproduction of the collected failure signal when it is safe and cheap, such as a failing test, smoke command, perf/strace comparison, or before/after runtime check. Only use `reproduced` if that command or test actually reproduced the failure; otherwise keep `observed` and report the reproduction blocker. The final explanation must connect the observed issue evidence to the actual code change, not just paraphrase the diff. Write like a maintainer is going to read the patch mail cold: explain the bug in plain language, define subsystem-specific jargon the first time you need it, and make the causal story obvious. Explicitly classify evidence confidence as `reproduced`, `observed`, or `inferred`: `reproduced` means you reproduced the failure locally; `observed` means Fixer has direct crash/log/trace evidence but you did not independently reproduce it; `inferred` means the source patch is not pull-request-ready, so do not leave a source diff unless you first gather stronger observed/reproduced evidence; otherwise return a no-patch diagnosis/report. For any source-changing `observed` patch, say explicitly in `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. Security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior need reproduced evidence plus explicit security-impact analysis before leaving a source diff; otherwise return a no-patch diagnosis/report for human review. If you introduce non-obvious state translation, index remapping, or backend split logic, add a short source comment that explains the invariant being preserved.
Start by explaining the likely root cause from the collected perf, strace, and /proc evidence. If you cannot land a safe patch, leave a diagnosis that is strong enough for an upstream bug report.
Interpreter process expectation: when the hot process is Python, Perl, shell, Node, Ruby, PHP, Lua, or another interpreter, inspect both the runtime and the script/application entrypoint from `details.interpreter_process`. Prefer the script or application package when evidence points there; do not patch the interpreter runtime merely because the hot binary is `python`, `perl`, `bash`, or similar. Runtime fixes are welcome only after checking the entrypoint and explaining why the runtime mishandles the workload or why running bad code faster/safer is itself the right upstream fix.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Keep the change narrowly scoped and summarize validation clearly.
In every authoring pass, your final response must start with `Subject: <single-line git commit subject>` and then include these markdown sections exactly:
## Commit Message
A short upstream-friendly explanation of what changed and why. Write it in plain language that a maintainer can follow without local complaint context. If you use subsystem jargon, define it immediately.
## Evidence Confidence
Exactly one word: `reproduced`, `observed`, or `inferred`. Use `reproduced` only when you reproduced the failure locally with a command or test, and include that command/test in `## Validation`. Use `observed` when Fixer has direct crash/log/trace evidence but you did not independently reproduce it. If `## Git Add Paths` lists source files for an `observed` patch, `## Issue Connection` must explicitly say the failure was observed by Fixer and not independently reproduced. Security-sensitive source changes touching authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior require reproduced evidence and explicit security-impact analysis; otherwise list `None` under `## Git Add Paths` and write a no-patch diagnosis/report. Use `inferred` for profiler/strace/indirect evidence; inferred responses may be no-patch diagnoses or reports, but inferred source patches are not pull-request-ready until stronger evidence is gathered.
## Issue Connection
Write this as maintainer-facing patch mail, not as local Fixer notes. Cover four things explicitly in readable sentences: the user-visible symptom or the exact collected signal, the code-level cause or the cautious inference from evidence, the specific change you made, and the expected effect. Do not invent a reproducer, command line, crash, or user-visible failure that is not present in the evidence bundle. If the evidence is direct-but-not-reproduced, say it was observed by Fixer and not independently reproduced. If the evidence is indirect and you did not gather stronger evidence, do not leave a source diff; write a no-patch diagnosis/report instead. Include an explicit effect sentence such as `The expected effect is ...`, `This should reduce ...`, or `This prevents ...` for source patches. If the logic is non-obvious in code, mention that you added a short explanatory comment.
## Git Add Paths
List the repo-relative paths that belong in the final patch, one per line. Use `None` only when you intentionally made no source changes. Include intentionally new files, and do not list generated build artifacts.
## Validation
List the checks you ran, or say clearly that you could not run them. Include the independent reproduction command/test and result when `## Evidence Confidence` is `reproduced`; if reproduction was attempted but blocked, name the exact blocker and keep confidence at `observed` or `inferred`.
Before editing, read the plan at `./plan-output.txt` and follow it unless the code proves part of it wrong. If you change course, say so explicitly in the final write-up instead of silently drifting from the plan.
## Review Pass 1
You are reviewing a freshly generated fixer patch.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Review the first patch pass. The original pre-edit snapshot is available at `./source` for diffing.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout. The latest author response is at `./patch-output.txt`. Inspect the current code and changed paths like a strict code reviewer. Focus on correctness, regressions, maintainability, awkward control flow such as avoidable `goto`, missing validation, weak or non-gittable commit message text, and explanations that fail to connect the observed issue evidence to the code change. Also review the maintainer experience: the patch mail should be easy to accept upstream, the user-visible bug should be explained in plain language, subsystem-specific jargon should be defined when first used, and any non-obvious state translation or index remapping in code should have a short explanatory comment. Reject patches that omit `## Evidence Confidence`, use anything other than `reproduced`, `observed`, or `inferred`, or sound more certain than that evidence level allows. Reject patches that claim `reproduced` unless `## Validation` names the concrete reproduction command or test and its result. Reject source patches in security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior unless the author reproduced the behavior and explicitly analyzed the security impact of the change; observed-only evidence should become a diagnosis/report, not a PR-ready source diff. Reject patches that invent a reproducer, command line, crash, or user-visible failure not present in the evidence bundle; indirect profiler or strace evidence may justify a cautious mitigation, but the author must say it is indirect instead of presenting it as a confirmed upstream bug. Reject patches that introduce generic libc/std APIs when nearby code or project docs provide a local compat/helper API for the same job, unless the author explicitly justifies the exception. Reject validation that only reports a leaf object/syntax build when a project-level configure/build/test entrypoint exists and was not attempted; if a full build cannot run, the author must show the exact failed command and blocker.
Do not apply code changes in this pass.
Return a short markdown review report. The first non-empty line must be exactly one of:
RESULT: ok
RESULT: fix-needed
If you choose `RESULT: fix-needed`, add a `## Findings` section with concrete, actionable items.## Plan Pass
## Problem
Fixer flagged `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` as a likely busy poll loop, but the retained evidence shows `munin-node` sleeping in `pselect6` with 1.8-2.0 second timeouts and only 0.9% CPU. The Perl-level stack was not retained, and the raw investigation artifacts are not available in this workspace.
## Evidence Confidence
inferred
## Proposed Subject
No source patch: report `munin-node` idle `pselect6` as insufficient evidence for a busy-loop fix
## Patch Plan
Do not edit source in this pass. The observed frames are consistent with `Munin::Node::Server` inheriting `Net::Server::Fork` and waiting for connections, not Munin application code spinning.
If later evidence shows a real wakeup loop, investigate `script/munin-node` first, then `lib/Munin/Node/Server.pm`, following Munin’s conventions from `CONTRIBUTING.md` and `HACKING.pod`: strict/warnings Perl, existing file style, no warnings, and project tests. Prefer local helpers already in this subsystem: `Munin::Common::Timeout::do_with_timeout`, `Munin::Common::Logger`, `Munin::Common::Daemon::emit_sd_notify_message`, `Munin::Node::OS->run_as_child`, and the existing `Net::Server` callback model.
No relevant prior Fixer patch was found. Existing Debian patches are unrelated. No awkward control-flow change such as a `goto` is planned.
## Risks
A source patch based only on this bundle would likely change normal daemon idle behavior. The evidence does not prove a script-level bug, runtime bug, or user-visible failure. This is not security-sensitive as planned because no auth, permission, credential, crypto, sandbox, or throttling behavior would be changed.
## Validation
Before any focused check, try project-level validation from the workspace root: `make`; then `make check` if a check target exists. This Makefile advertises `make test`, so use `make test` if `make check` is unavailable.
For a bounded independent signal check, after building/installing the sandbox, run `./dev_scripts/run munin-node --foreground` under a short `timeout` and `strace -ttT -e trace=pselect6,select,poll,ppoll`. Treat repeated multi-second blocking waits plus low CPU as a non-reproduction of the reported busy loop, not as a fixed bug.
## Patch Pass
Subject: Report inconclusive munin-node select trace
## Commit Message
No source change is included. The collected trace looks like an idle `munin-node` daemon waiting in `select`, not a proven busy loop in Munin code. A patch would risk changing normal daemon behavior without a reproducible failure or a Perl-level stack tied to Munin application logic.
## Evidence Confidence
inferred
## Issue Connection
Fixer collected perf, strace, and `/proc` evidence for `/usr/bin/perl -wT /usr/sbin/munin-node --foreground`: the native stack passed through Perl and `select`, while `/proc` reported the process as sleeping and strace showed `pselect6` calls blocking for about 1.8 to 2.0 seconds. That is an indirect profiler signal, not a confirmed user-visible runaway CPU failure.
The cautious code-level inference is that `script/munin-node` enters `Munin::Node::Server->run`, and `Munin::Node::Server` inherits `Net::Server::Fork`; the sampled `select` is consistent with the server accept loop waiting for work. I inspected the Perl runtime enough to confirm the hot binary is Perl 5.40.1, but the retained evidence points to the script entrypoint and does not show a Perl runtime bug.
I followed the saved plan and left no source diff. Local helpers and conventions found were `Munin::Common::Timeout::do_with_timeout`, `Munin::Common::Logger`, `Munin::Common::Daemon::emit_sd_notify_message`, `Munin::Node::OS->run_as_child`, and the existing `Net::Server` callback model. The expected effect is that upstream does not receive a speculative behavior change based on an idle wait trace.
## Git Add Paths
None
## Validation
`make` failed before building Munin code: `Can't locate Module/Build.pm in @INC` from `Build.PL line 80`.
`make check` failed because there is no `check` target: `make: *** No rule to make target 'check'. Stop.`
`make test` failed with the same missing `Module::Build.pm` blocker.
Narrow checks run:
`perl -Ilib -c lib/Munin/Node/Server.pm` passed.
`perl -T -Ilib -c script/munin-node` passed.
Independent reproduction attempt:
`timeout 8s strace -ttT -f -e trace=pselect6,select,poll,ppoll /usr/bin/perl -wT -Ilib script/munin-node --foreground` was blocked by sandbox ptrace policy: `PTRACE_TRACEME: Operation not permitted`.
A non-ptrace foreground smoke with a temporary high-port config reached `Net::Server::Fork` but could not bind a listener: `Cannot bind and listen to TCP port 14949 on 127.0.0.1 [Operation not permitted]`. The collected busy-loop signal was not reproduced locally.
## Review Pass 1
RESULT: ok
The first patch pass correctly leaves no source diff. `git status` and `git diff` are clean, and `## Git Add Paths` lists `None`.
The author’s `inferred` evidence classification is appropriate: the bundle has indirect perf/strace evidence, `/proc` shows the process sleeping, strace shows multi-second `pselect6` waits, and no local reproduction or Perl-level stack ties the signal to Munin code. The write-up does not overclaim a confirmed upstream bug.
Validation is acceptable for a no-patch diagnosis: project-level `make`, `make check`, and `make test` were attempted with exact blockers, narrower Perl syntax checks were run, and the independent strace/smoke reproduction attempts report concrete sandbox blockers. Contribution docs and local subsystem helpers were named, and no generic API or awkward control-flow change was introduced.perl likely remains stuck in a busy-poll loop. A diagnosis report and patch proposal were created locally.
## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.
## Patch Pass
You are working on a bounded fixer proposal.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Produce the smallest reasonable patch for the target repository, keep the change upstreamable, prefer the clearest control flow available, and do not keep avoidable `goto` when a simpler structure would read better. Before introducing new file, process, allocation, locking, networking, or platform APIs, inspect nearby code and project contribution docs for existing helpers or compatibility wrappers and use those local patterns unless you can explain why they do not fit. Validate from a reproducible workspace-root entrypoint before falling back to focused leaf commands; if a build or test cannot run, report the exact command, the exact blocker, and any narrower check you ran instead. During validation, also try one bounded independent reproduction of the collected failure signal when it is safe and cheap, such as a failing test, smoke command, perf/strace comparison, or before/after runtime check. Only use `reproduced` if that command or test actually reproduced the failure; otherwise keep `observed` and report the reproduction blocker. The final explanation must connect the observed issue evidence to the actual code change, not just paraphrase the diff. Write like a maintainer is going to read the patch mail cold: explain the bug in plain language, define subsystem-specific jargon the first time you need it, and make the causal story obvious. Explicitly classify evidence confidence as `reproduced`, `observed`, or `inferred`: `reproduced` means you reproduced the failure locally; `observed` means Fixer has direct crash/log/trace evidence but you did not independently reproduce it; `inferred` means the source patch is not pull-request-ready, so do not leave a source diff unless you first gather stronger observed/reproduced evidence; otherwise return a no-patch diagnosis/report. For any source-changing `observed` patch, say explicitly in `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. Security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior need reproduced evidence plus explicit security-impact analysis before leaving a source diff; otherwise return a no-patch diagnosis/report for human review. If you introduce non-obvious state translation, index remapping, or backend split logic, add a short source comment that explains the invariant being preserved.
Start by explaining the likely root cause from the collected perf, strace, and /proc evidence. If you cannot land a safe patch, leave a diagnosis that is strong enough for an upstream bug report.
Interpreter process expectation: when the hot process is Python, Perl, shell, Node, Ruby, PHP, Lua, or another interpreter, inspect both the runtime and the script/application entrypoint from `details.interpreter_process`. Prefer the script or application package when evidence points there; do not patch the interpreter runtime merely because the hot binary is `python`, `perl`, `bash`, or similar. Runtime fixes are welcome only after checking the entrypoint and explaining why the runtime mishandles the workload or why running bad code faster/safer is itself the right upstream fix.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Keep the change narrowly scoped and summarize validation clearly.
In every authoring pass, your final response must start with `Subject: <single-line git commit subject>` and then include these markdown sections exactly:
## Commit Message
A short upstream-friendly explanation of what changed and why. Write it in plain language that a maintainer can follow without local complaint context. If you use subsystem jargon, define it immediately.
## Evidence Confidence
Exactly one word: `reproduced`, `observed`, or `inferred`. Use `reproduced` only when you reproduced the failure locally with a command or test, and include that command/test in `## Validation`. Use `observed` when Fixer has direct crash/log/trace evidence but you did not independently reproduce it. If `## Git Add Paths` lists source files for an `observed` patch, `## Issue Connection` must explicitly say the failure was observed by Fixer and not independently reproduced. Security-sensitive source changes touching authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior require reproduced evidence and explicit security-impact analysis; otherwise list `None` under `## Git Add Paths` and write a no-patch diagnosis/report. Use `inferred` for profiler/strace/indirect evidence; inferred responses may be no-patch diagnoses or reports, but inferred source patches are not pull-request-ready until stronger evidence is gathered.
## Issue Connection
Write this as maintainer-facing patch mail, not as local Fixer notes. Cover four things explicitly in readable sentences: the user-visible symptom or the exact collected signal, the code-level cause or the cautious inference from evidence, the specific change you made, and the expected effect. Do not invent a reproducer, command line, crash, or user-visible failure that is not present in the evidence bundle. If the evidence is direct-but-not-reproduced, say it was observed by Fixer and not independently reproduced. If the evidence is indirect and you did not gather stronger evidence, do not leave a source diff; write a no-patch diagnosis/report instead. Include an explicit effect sentence such as `The expected effect is ...`, `This should reduce ...`, or `This prevents ...` for source patches. If the logic is non-obvious in code, mention that you added a short explanatory comment.
## Git Add Paths
List the repo-relative paths that belong in the final patch, one per line. Use `None` only when you intentionally made no source changes. Include intentionally new files, and do not list generated build artifacts.
## Validation
List the checks you ran, or say clearly that you could not run them. Include the independent reproduction command/test and result when `## Evidence Confidence` is `reproduced`; if reproduction was attempted but blocked, name the exact blocker and keep confidence at `observed` or `inferred`.
Before editing, read the plan at `./plan-output.txt` and follow it unless the code proves part of it wrong. If you change course, say so explicitly in the final write-up instead of silently drifting from the plan.
## Review Pass 1
You are reviewing a freshly generated fixer patch.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Review the first patch pass. The original pre-edit snapshot is available at `./source` for diffing.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout. The latest author response is at `./patch-output.txt`. Inspect the current code and changed paths like a strict code reviewer. Focus on correctness, regressions, maintainability, awkward control flow such as avoidable `goto`, missing validation, weak or non-gittable commit message text, and explanations that fail to connect the observed issue evidence to the code change. Also review the maintainer experience: the patch mail should be easy to accept upstream, the user-visible bug should be explained in plain language, subsystem-specific jargon should be defined when first used, and any non-obvious state translation or index remapping in code should have a short explanatory comment. Reject patches that omit `## Evidence Confidence`, use anything other than `reproduced`, `observed`, or `inferred`, or sound more certain than that evidence level allows. Reject patches that claim `reproduced` unless `## Validation` names the concrete reproduction command or test and its result. Reject source patches in security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior unless the author reproduced the behavior and explicitly analyzed the security impact of the change; observed-only evidence should become a diagnosis/report, not a PR-ready source diff. Reject patches that invent a reproducer, command line, crash, or user-visible failure not present in the evidence bundle; indirect profiler or strace evidence may justify a cautious mitigation, but the author must say it is indirect instead of presenting it as a confirmed upstream bug. Reject patches that introduce generic libc/std APIs when nearby code or project docs provide a local compat/helper API for the same job, unless the author explicitly justifies the exception. Reject validation that only reports a leaf object/syntax build when a project-level configure/build/test entrypoint exists and was not attempted; if a full build cannot run, the author must show the exact failed command and blocker.
Do not apply code changes in this pass.
Return a short markdown review report. The first non-empty line must be exactly one of:
RESULT: ok
RESULT: fix-needed
If you choose `RESULT: fix-needed`, add a `## Findings` section with concrete, actionable items.## Plan Pass
## Problem
Fixer observed `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` in repeated `pselect6` samples and labeled it a likely busy-poll loop, but the retained evidence also shows the process in sleeping state, only ~0.9% CPU, and `pselect6` calls timing out after about 1.8-2.0 seconds. The bundle lacks a Perl-level stack or script-line evidence tying the sampled wait to faulty Munin logic.
## Evidence Confidence
inferred
## Proposed Subject
No source patch: diagnose munin-node idle `pselect6` evidence as insufficient for an upstream busy-loop fix
## Patch Plan
Do not edit source in this pass. The maintainer-facing outcome should explain that the evidence points at `munin-node`’s normal daemon wait path more than a proven runaway loop.
I inspected `script/munin-node` and `lib/Munin/Node/Server.pm`: the daemon delegates to `Net::Server::Fork`, uses normal stdin line reads for client sessions, and wraps request/plugin work with local helpers such as `Munin::Common::Timeout`, `Munin::Node::OS->run_as_child`, and `Munin::Common::Logger`. I did not find a local Munin busy-poll helper or a tight retry loop matching the captured profile.
No prior Fixer patch for this finding was present; Debian patches are unrelated. No awkward control flow such as `goto` should be introduced. If later evidence proves a real loop, the patch should stay in Munin’s node subsystem and use existing timeout/logging conventions instead of adding ad hoc polling or generic process-control code.
## Risks
A speculative source change here would likely alter daemon timing or connection handling without proving a bug, which is risky for a network service. The current evidence may simply show `Net::Server` waiting for connections with a bounded timeout.
## Validation
Before any later patch, try the project entrypoint from the workspace root: `make`, then `make check` only if that target exists. If dependencies or generated files are missing, report the exact command and failure.
For bounded independent evidence collection, run `munin-node` foreground with a temporary minimal config on an unused port under `timeout` plus `strace -ttT -e pselect6,select,poll,ppoll`, and confirm whether it burns CPU or just blocks in timed waits. Do not claim reproduced unless that command shows an actual tight loop or elevated CPU.
## Patch Pass
Subject: Diagnose munin-node idle select evidence
## Commit Message
No source change. The collected perf, strace, and `/proc` evidence points to `munin-node` sleeping in a timed `select`/`pselect6` wait, not to a proven tight Perl or Munin event loop. Without a Perl-level stack or a reproducible busy loop, an upstream source patch would be speculative.
## Evidence Confidence
inferred
## Issue Connection
The collected signal was `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` sampled around `select`/`pselect6`, with Fixer classifying it as likely busy-poll. The same bundle shows `State: S (sleeping)`, `wchan: poll_schedule_timeout.constprop.0`, only about 0.9% CPU, and `pselect6` calls that timed out after about 1.8 to 2.0 seconds. That is more consistent with a daemon waiting for socket activity than with a tight loop.
I inspected the Perl entrypoint first, as required for interpreter processes. `script/munin-node` delegates to `Munin::Node::Server`, which subclasses `Net::Server::Fork`; request work is bounded with `Munin::Common::Timeout`, plugin execution goes through `Munin::Node::OS->run_as_child`, and logging uses `Munin::Common::Logger`. The Perl runtime evidence only shows native Perl frames reaching `select`; it does not show a runtime bug or a Munin script line causing rapid wakeups.
I followed the saved plan and did not leave a source diff. No prior Fixer patch for this finding was present, and there was no local helper missing or awkward `goto` control flow to improve. The expected effect of this no-patch result is to avoid an unsafe timing/networking change until stronger evidence, such as a Perl-level stack or reproducible tight polling trace, is available.
## Git Add Paths
None
## Validation
`make` failed from the workspace root because `Module::Build` is missing: `Can't locate Module/Build.pm in @INC ... at Build.PL line 80`, followed by `make: *** [Makefile:149: Build] Error 2`.
`make check` failed because this tree has no `check` target: `make: *** No rule to make target 'check'. Stop.`
Focused checks run after the project-level blocker:
`perl -T -Ilib -c script/munin-node` passed.
`perl -Ilib -c lib/Munin/Node/Server.pm` passed.
Independent reproduction was attempted but blocked. `strace -ttT -f -e trace=pselect6,select,poll,ppoll,...` failed with `PTRACE_TRACEME: Operation not permitted`. A non-ptrace foreground `munin-node` smoke attempt with a temporary config also could not reach the idle wait path because binding `127.0.0.1:54949` failed with `Cannot bind and listen ... [Operation not permitted]`. No local command reproduced the reported busy loop, so confidence remains `inferred`.
## Review Pass 1
RESULT: ok
No source diff is present, which is appropriate for the `inferred` evidence level. The author did not overclaim reproduction, did not invent a user-visible failure, and correctly treated the profiler/strace signal as insufficient for a PR-ready source patch.
The response includes required sections, uses a valid `## Evidence Confidence` value, explains the Perl entrypoint inspection, names relevant Munin helpers (`Munin::Common::Timeout`, `Munin::Node::OS->run_as_child`, `Munin::Common::Logger`), and reports project-level validation attempts with exact blockers. The failed independent reproduction attempts are also clearly described, so keeping confidence at `inferred` is consistent.perl likely remains stuck in a busy-poll loop. A diagnosis report and patch proposal were created locally.
## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.
## Patch Pass
You are working on a bounded fixer proposal.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Produce the smallest reasonable patch for the target repository, keep the change upstreamable, prefer the clearest control flow available, and do not keep avoidable `goto` when a simpler structure would read better. Before introducing new file, process, allocation, locking, networking, or platform APIs, inspect nearby code and project contribution docs for existing helpers or compatibility wrappers and use those local patterns unless you can explain why they do not fit. Validate from a reproducible workspace-root entrypoint before falling back to focused leaf commands; if a build or test cannot run, report the exact command, the exact blocker, and any narrower check you ran instead. During validation, also try one bounded independent reproduction of the collected failure signal when it is safe and cheap, such as a failing test, smoke command, perf/strace comparison, or before/after runtime check. Only use `reproduced` if that command or test actually reproduced the failure; otherwise keep `observed` and report the reproduction blocker. The final explanation must connect the observed issue evidence to the actual code change, not just paraphrase the diff. Write like a maintainer is going to read the patch mail cold: explain the bug in plain language, define subsystem-specific jargon the first time you need it, and make the causal story obvious. Explicitly classify evidence confidence as `reproduced`, `observed`, or `inferred`: `reproduced` means you reproduced the failure locally; `observed` means Fixer has direct crash/log/trace evidence but you did not independently reproduce it; `inferred` means the source patch is not pull-request-ready, so do not leave a source diff unless you first gather stronger observed/reproduced evidence; otherwise return a no-patch diagnosis/report. For any source-changing `observed` patch, say explicitly in `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. Security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior need reproduced evidence plus explicit security-impact analysis before leaving a source diff; otherwise return a no-patch diagnosis/report for human review. If you introduce non-obvious state translation, index remapping, or backend split logic, add a short source comment that explains the invariant being preserved.
Start by explaining the likely root cause from the collected perf, strace, and /proc evidence. If you cannot land a safe patch, leave a diagnosis that is strong enough for an upstream bug report.
Interpreter process expectation: when the hot process is Python, Perl, shell, Node, Ruby, PHP, Lua, or another interpreter, inspect both the runtime and the script/application entrypoint from `details.interpreter_process`. Prefer the script or application package when evidence points there; do not patch the interpreter runtime merely because the hot binary is `python`, `perl`, `bash`, or similar. Runtime fixes are welcome only after checking the entrypoint and explaining why the runtime mishandles the workload or why running bad code faster/safer is itself the right upstream fix.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Keep the change narrowly scoped and summarize validation clearly.
In every authoring pass, your final response must start with `Subject: <single-line git commit subject>` and then include these markdown sections exactly:
## Commit Message
A short upstream-friendly explanation of what changed and why. Write it in plain language that a maintainer can follow without local complaint context. If you use subsystem jargon, define it immediately.
## Evidence Confidence
Exactly one word: `reproduced`, `observed`, or `inferred`. Use `reproduced` only when you reproduced the failure locally with a command or test, and include that command/test in `## Validation`. Use `observed` when Fixer has direct crash/log/trace evidence but you did not independently reproduce it. If `## Git Add Paths` lists source files for an `observed` patch, `## Issue Connection` must explicitly say the failure was observed by Fixer and not independently reproduced. Security-sensitive source changes touching authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior require reproduced evidence and explicit security-impact analysis; otherwise list `None` under `## Git Add Paths` and write a no-patch diagnosis/report. Use `inferred` for profiler/strace/indirect evidence; inferred responses may be no-patch diagnoses or reports, but inferred source patches are not pull-request-ready until stronger evidence is gathered.
## Issue Connection
Write this as maintainer-facing patch mail, not as local Fixer notes. Cover four things explicitly in readable sentences: the user-visible symptom or the exact collected signal, the code-level cause or the cautious inference from evidence, the specific change you made, and the expected effect. Do not invent a reproducer, command line, crash, or user-visible failure that is not present in the evidence bundle. If the evidence is direct-but-not-reproduced, say it was observed by Fixer and not independently reproduced. If the evidence is indirect and you did not gather stronger evidence, do not leave a source diff; write a no-patch diagnosis/report instead. Include an explicit effect sentence such as `The expected effect is ...`, `This should reduce ...`, or `This prevents ...` for source patches. If the logic is non-obvious in code, mention that you added a short explanatory comment.
## Git Add Paths
List the repo-relative paths that belong in the final patch, one per line. Use `None` only when you intentionally made no source changes. Include intentionally new files, and do not list generated build artifacts.
## Validation
List the checks you ran, or say clearly that you could not run them. Include the independent reproduction command/test and result when `## Evidence Confidence` is `reproduced`; if reproduction was attempted but blocked, name the exact blocker and keep confidence at `observed` or `inferred`.
Before editing, read the plan at `./plan-output.txt` and follow it unless the code proves part of it wrong. If you change course, say so explicitly in the final write-up instead of silently drifting from the plan.
## Review Pass 1
You are reviewing a freshly generated fixer patch.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Review the first patch pass. The original pre-edit snapshot is available at `./source` for diffing.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout. The latest author response is at `./patch-output.txt`. Inspect the current code and changed paths like a strict code reviewer. Focus on correctness, regressions, maintainability, awkward control flow such as avoidable `goto`, missing validation, weak or non-gittable commit message text, and explanations that fail to connect the observed issue evidence to the code change. Also review the maintainer experience: the patch mail should be easy to accept upstream, the user-visible bug should be explained in plain language, subsystem-specific jargon should be defined when first used, and any non-obvious state translation or index remapping in code should have a short explanatory comment. Reject patches that omit `## Evidence Confidence`, use anything other than `reproduced`, `observed`, or `inferred`, or sound more certain than that evidence level allows. Reject patches that claim `reproduced` unless `## Validation` names the concrete reproduction command or test and its result. Reject source patches in security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior unless the author reproduced the behavior and explicitly analyzed the security impact of the change; observed-only evidence should become a diagnosis/report, not a PR-ready source diff. Reject patches that invent a reproducer, command line, crash, or user-visible failure not present in the evidence bundle; indirect profiler or strace evidence may justify a cautious mitigation, but the author must say it is indirect instead of presenting it as a confirmed upstream bug. Reject patches that introduce generic libc/std APIs when nearby code or project docs provide a local compat/helper API for the same job, unless the author explicitly justifies the exception. Reject validation that only reports a leaf object/syntax build when a project-level configure/build/test entrypoint exists and was not attempted; if a full build cannot run, the author must show the exact failed command and blocker.
Do not apply code changes in this pass.
Return a short markdown review report. The first non-empty line must be exactly one of:
RESULT: ok
RESULT: fix-needed
If you choose `RESULT: fix-needed`, add a `## Findings` section with concrete, actionable items.## Plan Pass
## Problem
Fixer observed `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` in repeated `pselect6` samples and labeled it a likely busy-poll loop, but the retained evidence also shows the process in sleeping state, only ~0.9% CPU, and `pselect6` calls timing out after about 1.8-2.0 seconds. The bundle lacks a Perl-level stack or script-line evidence tying the sampled wait to faulty Munin logic.
## Evidence Confidence
inferred
## Proposed Subject
No source patch: diagnose munin-node idle `pselect6` evidence as insufficient for an upstream busy-loop fix
## Patch Plan
Do not edit source in this pass. The maintainer-facing outcome should explain that the evidence points at `munin-node`’s normal daemon wait path more than a proven runaway loop.
I inspected `script/munin-node` and `lib/Munin/Node/Server.pm`: the daemon delegates to `Net::Server::Fork`, uses normal stdin line reads for client sessions, and wraps request/plugin work with local helpers such as `Munin::Common::Timeout`, `Munin::Node::OS->run_as_child`, and `Munin::Common::Logger`. I did not find a local Munin busy-poll helper or a tight retry loop matching the captured profile.
No prior Fixer patch for this finding was present; Debian patches are unrelated. No awkward control flow such as `goto` should be introduced. If later evidence proves a real loop, the patch should stay in Munin’s node subsystem and use existing timeout/logging conventions instead of adding ad hoc polling or generic process-control code.
## Risks
A speculative source change here would likely alter daemon timing or connection handling without proving a bug, which is risky for a network service. The current evidence may simply show `Net::Server` waiting for connections with a bounded timeout.
## Validation
Before any later patch, try the project entrypoint from the workspace root: `make`, then `make check` only if that target exists. If dependencies or generated files are missing, report the exact command and failure.
For bounded independent evidence collection, run `munin-node` foreground with a temporary minimal config on an unused port under `timeout` plus `strace -ttT -e pselect6,select,poll,ppoll`, and confirm whether it burns CPU or just blocks in timed waits. Do not claim reproduced unless that command shows an actual tight loop or elevated CPU.
## Patch Pass
Subject: Diagnose munin-node idle select evidence
## Commit Message
No source change. The collected perf, strace, and `/proc` evidence points to `munin-node` sleeping in a timed `select`/`pselect6` wait, not to a proven tight Perl or Munin event loop. Without a Perl-level stack or a reproducible busy loop, an upstream source patch would be speculative.
## Evidence Confidence
inferred
## Issue Connection
The collected signal was `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` sampled around `select`/`pselect6`, with Fixer classifying it as likely busy-poll. The same bundle shows `State: S (sleeping)`, `wchan: poll_schedule_timeout.constprop.0`, only about 0.9% CPU, and `pselect6` calls that timed out after about 1.8 to 2.0 seconds. That is more consistent with a daemon waiting for socket activity than with a tight loop.
I inspected the Perl entrypoint first, as required for interpreter processes. `script/munin-node` delegates to `Munin::Node::Server`, which subclasses `Net::Server::Fork`; request work is bounded with `Munin::Common::Timeout`, plugin execution goes through `Munin::Node::OS->run_as_child`, and logging uses `Munin::Common::Logger`. The Perl runtime evidence only shows native Perl frames reaching `select`; it does not show a runtime bug or a Munin script line causing rapid wakeups.
I followed the saved plan and did not leave a source diff. No prior Fixer patch for this finding was present, and there was no local helper missing or awkward `goto` control flow to improve. The expected effect of this no-patch result is to avoid an unsafe timing/networking change until stronger evidence, such as a Perl-level stack or reproducible tight polling trace, is available.
## Git Add Paths
None
## Validation
`make` failed from the workspace root because `Module::Build` is missing: `Can't locate Module/Build.pm in @INC ... at Build.PL line 80`, followed by `make: *** [Makefile:149: Build] Error 2`.
`make check` failed because this tree has no `check` target: `make: *** No rule to make target 'check'. Stop.`
Focused checks run after the project-level blocker:
`perl -T -Ilib -c script/munin-node` passed.
`perl -Ilib -c lib/Munin/Node/Server.pm` passed.
Independent reproduction was attempted but blocked. `strace -ttT -f -e trace=pselect6,select,poll,ppoll,...` failed with `PTRACE_TRACEME: Operation not permitted`. A non-ptrace foreground `munin-node` smoke attempt with a temporary config also could not reach the idle wait path because binding `127.0.0.1:54949` failed with `Cannot bind and listen ... [Operation not permitted]`. No local command reproduced the reported busy loop, so confidence remains `inferred`.
## Review Pass 1
RESULT: ok
No source diff is present, which is appropriate for the `inferred` evidence level. The author did not overclaim reproduction, did not invent a user-visible failure, and correctly treated the profiler/strace signal as insufficient for a PR-ready source patch.
The response includes required sections, uses a valid `## Evidence Confidence` value, explains the Perl entrypoint inspection, names relevant Munin helpers (`Munin::Common::Timeout`, `Munin::Node::OS->run_as_child`, `Munin::Common::Logger`), and reports project-level validation attempts with exact blockers. The failed independent reproduction attempts are also clearly described, so keeping confidence at `inferred` is consistent.perl likely remains stuck in a busy-poll loop. The diagnosis was captured, but the patch proposal did not complete cleanly.
timeout
Codex stage timed out after 900 second(s)./usr/bin/perl -wT /usr/sbin/munin-node --foregroundThe trace repeatedly returns to a poll-family syscall without meaningful blocking, which suggests a busy event-loop wakeup.
Thread 1 (Thread 0x7f82eb914b80 (LWP 3947104) "munin-node"):
#0 0x00007f82eb9e87d2 in ?? () from target:<path>
#1 0x00007f82eb9e87ed in ?? () from target:<path>
#2 0x00007f82eba686cf in select () from target:<path>
#3 0x000055b5551b8ee4 in ?? ()
#4 0x000055b55521a496 in Perl_runops_standard ()
#5 0x000055b555100b85 in perl_run ()
#6 0x000055b5550d35ae in main ()## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.
## Patch Pass
You are working on a bounded fixer proposal.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Produce the smallest reasonable patch for the target repository, keep the change upstreamable, prefer the clearest control flow available, and do not keep avoidable `goto` when a simpler structure would read better. Before introducing new file, process, allocation, locking, networking, or platform APIs, inspect nearby code and project contribution docs for existing helpers or compatibility wrappers and use those local patterns unless you can explain why they do not fit. Validate from a reproducible workspace-root entrypoint before falling back to focused leaf commands; if a build or test cannot run, report the exact command, the exact blocker, and any narrower check you ran instead. During validation, also try one bounded independent reproduction of the collected failure signal when it is safe and cheap, such as a failing test, smoke command, perf/strace comparison, or before/after runtime check. Only use `reproduced` if that command or test actually reproduced the failure; otherwise keep `observed` and report the reproduction blocker. The final explanation must connect the observed issue evidence to the actual code change, not just paraphrase the diff. Write like a maintainer is going to read the patch mail cold: explain the bug in plain language, define subsystem-specific jargon the first time you need it, and make the causal story obvious. Explicitly classify evidence confidence as `reproduced`, `observed`, or `inferred`: `reproduced` means you reproduced the failure locally; `observed` means Fixer has direct crash/log/trace evidence but you did not independently reproduce it; `inferred` means the source patch is not pull-request-ready, so do not leave a source diff unless you first gather stronger observed/reproduced evidence; otherwise return a no-patch diagnosis/report. For any source-changing `observed` patch, say explicitly in `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. Security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior need reproduced evidence plus explicit security-impact analysis before leaving a source diff; otherwise return a no-patch diagnosis/report for human review. If you introduce non-obvious state translation, index remapping, or backend split logic, add a short source comment that explains the invariant being preserved.
Start by explaining the likely root cause from the collected perf, strace, and /proc evidence. If you cannot land a safe patch, leave a diagnosis that is strong enough for an upstream bug report.
Interpreter process expectation: when the hot process is Python, Perl, shell, Node, Ruby, PHP, Lua, or another interpreter, inspect both the runtime and the script/application entrypoint from `details.interpreter_process`. Prefer the script or application package when evidence points there; do not patch the interpreter runtime merely because the hot binary is `python`, `perl`, `bash`, or similar. Runtime fixes are welcome only after checking the entrypoint and explaining why the runtime mishandles the workload or why running bad code faster/safer is itself the right upstream fix.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Keep the change narrowly scoped and summarize validation clearly.
In every authoring pass, your final response must start with `Subject: <single-line git commit subject>` and then include these markdown sections exactly:
## Commit Message
A short upstream-friendly explanation of what changed and why. Write it in plain language that a maintainer can follow without local complaint context. If you use subsystem jargon, define it immediately.
## Evidence Confidence
Exactly one word: `reproduced`, `observed`, or `inferred`. Use `reproduced` only when you reproduced the failure locally with a command or test, and include that command/test in `## Validation`. Use `observed` when Fixer has direct crash/log/trace evidence but you did not independently reproduce it. If `## Git Add Paths` lists source files for an `observed` patch, `## Issue Connection` must explicitly say the failure was observed by Fixer and not independently reproduced. Security-sensitive source changes touching authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior require reproduced evidence and explicit security-impact analysis; otherwise list `None` under `## Git Add Paths` and write a no-patch diagnosis/report. Use `inferred` for profiler/strace/indirect evidence; inferred responses may be no-patch diagnoses or reports, but inferred source patches are not pull-request-ready until stronger evidence is gathered.
## Issue Connection
Write this as maintainer-facing patch mail, not as local Fixer notes. Cover four things explicitly in readable sentences: the user-visible symptom or the exact collected signal, the code-level cause or the cautious inference from evidence, the specific change you made, and the expected effect. Do not invent a reproducer, command line, crash, or user-visible failure that is not present in the evidence bundle. If the evidence is direct-but-not-reproduced, say it was observed by Fixer and not independently reproduced. If the evidence is indirect and you did not gather stronger evidence, do not leave a source diff; write a no-patch diagnosis/report instead. Include an explicit effect sentence such as `The expected effect is ...`, `This should reduce ...`, or `This prevents ...` for source patches. If the logic is non-obvious in code, mention that you added a short explanatory comment.
## Git Add Paths
List the repo-relative paths that belong in the final patch, one per line. Use `None` only when you intentionally made no source changes. Include intentionally new files, and do not list generated build artifacts.
## Validation
List the checks you ran, or say clearly that you could not run them. Include the independent reproduction command/test and result when `## Evidence Confidence` is `reproduced`; if reproduction was attempted but blocked, name the exact blocker and keep confidence at `observed` or `inferred`.
Before editing, read the plan at `./plan-output.txt` and follow it unless the code proves part of it wrong. If you change course, say so explicitly in the final write-up instead of silently drifting from the plan.## Plan Pass
## Problem
Fixer observed `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` in repeated `pselect6`, but the retained evidence does not tie the wait to a Munin source line. The sampled process was `S (sleeping)`, CPU was only `0.9%`, and `strace` showed blocking timeouts around 1.8-2.0 seconds, which looks like normal idle listener behavior rather than a proven busy loop.
## Evidence Confidence
observed
## Proposed Subject
No source patch: report the evidence as insufficient for a Munin change until a Perl-level stack or reproducible high-CPU loop is collected.
## Patch Plan
Do not edit Munin in this pass. `script/munin-node` enters `Munin::Node::Server->run`, and `lib/Munin/Node/Server.pm` delegates the outer accept/select loop to `Net::Server::Fork`; request and plugin work is already bounded with the local helper `Munin::Common::Timeout::do_with_timeout`.
Contribution/style docs checked: `CONTRIBUTING.md` and `HACKING.pod` require taint-mode Perl, `strict`/`warnings`, local indentation style, and no warnings. No relevant Munin wrapper was found for replacing `Net::Server::Fork`’s idle select behavior. No prior Fixer patch for this issue was found.
If future evidence proves a Munin-side loop, patch the smallest bounded branch in `Munin::Node::Server` or TLS/session handling, following existing helper/logging conventions and avoiding awkward control flow such as avoidable `goto`.
## Risks
A source patch now would likely change idle server behavior without proving a bug. Listener timing touches availability and connection handling, so speculative throttling or sleeps could regress normal node responsiveness.
## Validation
Tried project root `make`: failed before build generation because `Module::Build.pm` is missing at `Build.PL line 80`.
Tried `make check`: failed because there is no `check` target. The maintained target is `make test`.
Focused checks run from workspace root:
`perl -Ilib -c lib/Munin/Node/Server.pm`
`perl -Ilib -c lib/Munin/Common/TLS.pm`
`perl -Ilib -c lib/Munin/Node/Session.pm`
All three syntax checks passed.
Bounded independent smoke attempt:
`timeout 6s perl -I... -wT .../script/munin-node --foreground --config .../t/config/munin-node.conf --servicedir .../plugins/node.d.debug --sconfdir .../t/config --debug`
This did not reproduce the evidence; it exited `1` without stderr after switching to absolute paths.
## Patch Pass
## Workflow Note
Codex stage timed out after 900 second(s).perl likely remains stuck in a busy-poll loop. A diagnosis report and patch proposal were created locally.
## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.
## Patch Pass
You are working on a bounded fixer proposal.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Produce the smallest reasonable patch for the target repository, keep the change upstreamable, prefer the clearest control flow available, and do not keep avoidable `goto` when a simpler structure would read better. Before introducing new file, process, allocation, locking, networking, or platform APIs, inspect nearby code and project contribution docs for existing helpers or compatibility wrappers and use those local patterns unless you can explain why they do not fit. Validate from a reproducible workspace-root entrypoint before falling back to focused leaf commands; if a build or test cannot run, report the exact command, the exact blocker, and any narrower check you ran instead. During validation, also try one bounded independent reproduction of the collected failure signal when it is safe and cheap, such as a failing test, smoke command, perf/strace comparison, or before/after runtime check. Only use `reproduced` if that command or test actually reproduced the failure; otherwise keep `observed` and report the reproduction blocker. The final explanation must connect the observed issue evidence to the actual code change, not just paraphrase the diff. Write like a maintainer is going to read the patch mail cold: explain the bug in plain language, define subsystem-specific jargon the first time you need it, and make the causal story obvious. Explicitly classify evidence confidence as `reproduced`, `observed`, or `inferred`: `reproduced` means you reproduced the failure locally; `observed` means Fixer has direct crash/log/trace evidence but you did not independently reproduce it; `inferred` means the source patch is not pull-request-ready, so do not leave a source diff unless you first gather stronger observed/reproduced evidence; otherwise return a no-patch diagnosis/report. For any source-changing `observed` patch, say explicitly in `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. Security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior need reproduced evidence plus explicit security-impact analysis before leaving a source diff; otherwise return a no-patch diagnosis/report for human review. If you introduce non-obvious state translation, index remapping, or backend split logic, add a short source comment that explains the invariant being preserved.
Start by explaining the likely root cause from the collected perf, strace, and /proc evidence. If you cannot land a safe patch, leave a diagnosis that is strong enough for an upstream bug report.
Interpreter process expectation: when the hot process is Python, Perl, shell, Node, Ruby, PHP, Lua, or another interpreter, inspect both the runtime and the script/application entrypoint from `details.interpreter_process`. Prefer the script or application package when evidence points there; do not patch the interpreter runtime merely because the hot binary is `python`, `perl`, `bash`, or similar. Runtime fixes are welcome only after checking the entrypoint and explaining why the runtime mishandles the workload or why running bad code faster/safer is itself the right upstream fix.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Keep the change narrowly scoped and summarize validation clearly.
In every authoring pass, your final response must start with `Subject: <single-line git commit subject>` and then include these markdown sections exactly:
## Commit Message
A short upstream-friendly explanation of what changed and why. Write it in plain language that a maintainer can follow without local complaint context. If you use subsystem jargon, define it immediately.
## Evidence Confidence
Exactly one word: `reproduced`, `observed`, or `inferred`. Use `reproduced` only when you reproduced the failure locally with a command or test, and include that command/test in `## Validation`. Use `observed` when Fixer has direct crash/log/trace evidence but you did not independently reproduce it. If `## Git Add Paths` lists source files for an `observed` patch, `## Issue Connection` must explicitly say the failure was observed by Fixer and not independently reproduced. Security-sensitive source changes touching authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior require reproduced evidence and explicit security-impact analysis; otherwise list `None` under `## Git Add Paths` and write a no-patch diagnosis/report. Use `inferred` for profiler/strace/indirect evidence; inferred responses may be no-patch diagnoses or reports, but inferred source patches are not pull-request-ready until stronger evidence is gathered.
## Issue Connection
Write this as maintainer-facing patch mail, not as local Fixer notes. Cover four things explicitly in readable sentences: the user-visible symptom or the exact collected signal, the code-level cause or the cautious inference from evidence, the specific change you made, and the expected effect. Do not invent a reproducer, command line, crash, or user-visible failure that is not present in the evidence bundle. If the evidence is direct-but-not-reproduced, say it was observed by Fixer and not independently reproduced. If the evidence is indirect and you did not gather stronger evidence, do not leave a source diff; write a no-patch diagnosis/report instead. Include an explicit effect sentence such as `The expected effect is ...`, `This should reduce ...`, or `This prevents ...` for source patches. If the logic is non-obvious in code, mention that you added a short explanatory comment.
## Git Add Paths
List the repo-relative paths that belong in the final patch, one per line. Use `None` only when you intentionally made no source changes. Include intentionally new files, and do not list generated build artifacts.
## Validation
List the checks you ran, or say clearly that you could not run them. Include the independent reproduction command/test and result when `## Evidence Confidence` is `reproduced`; if reproduction was attempted but blocked, name the exact blocker and keep confidence at `observed` or `inferred`.
Before editing, read the plan at `./plan-output.txt` and follow it unless the code proves part of it wrong. If you change course, say so explicitly in the final write-up instead of silently drifting from the plan.
## Review Pass 1
You are reviewing a freshly generated fixer patch.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Review the first patch pass. The original pre-edit snapshot is available at `./source` for diffing.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout. The latest author response is at `./patch-output.txt`. Inspect the current code and changed paths like a strict code reviewer. Focus on correctness, regressions, maintainability, awkward control flow such as avoidable `goto`, missing validation, weak or non-gittable commit message text, and explanations that fail to connect the observed issue evidence to the code change. Also review the maintainer experience: the patch mail should be easy to accept upstream, the user-visible bug should be explained in plain language, subsystem-specific jargon should be defined when first used, and any non-obvious state translation or index remapping in code should have a short explanatory comment. Reject patches that omit `## Evidence Confidence`, use anything other than `reproduced`, `observed`, or `inferred`, or sound more certain than that evidence level allows. Reject patches that claim `reproduced` unless `## Validation` names the concrete reproduction command or test and its result. Reject source patches in security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior unless the author reproduced the behavior and explicitly analyzed the security impact of the change; observed-only evidence should become a diagnosis/report, not a PR-ready source diff. Reject patches that invent a reproducer, command line, crash, or user-visible failure not present in the evidence bundle; indirect profiler or strace evidence may justify a cautious mitigation, but the author must say it is indirect instead of presenting it as a confirmed upstream bug. Reject patches that introduce generic libc/std APIs when nearby code or project docs provide a local compat/helper API for the same job, unless the author explicitly justifies the exception. Reject validation that only reports a leaf object/syntax build when a project-level configure/build/test entrypoint exists and was not attempted; if a full build cannot run, the author must show the exact failed command and blocker.
Do not apply code changes in this pass.
Return a short markdown review report. The first non-empty line must be exactly one of:
RESULT: ok
RESULT: fix-needed
If you choose `RESULT: fix-needed`, add a `## Findings` section with concrete, actionable items.## Plan Pass
## Problem
Fixer observed `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` in a poll-family syscall path, but the retained `strace` shows `pselect6` calls blocking for about 1.8 to 2.0 seconds, process state `S (sleeping)`, and only 0.9% CPU. The evidence does not include a Perl-level stack or a munin-node command/session tying the sampled native frame to a tight application loop.
## Evidence Confidence
observed
## Proposed Subject
No source patch yet: document insufficient evidence for a munin busy-poll fix and collect a Perl/application-level reproduction before editing.
## Patch Plan
Do not edit munin in this pass. The current evidence is profiler-only/indirect and appears internally mixed: it labels a busy-poll loop, but the captured syscalls are timed sleeps rather than immediate wakeups.
If more evidence is collected before editing, investigate the script entrypoint first: `script/munin-node`, then `lib/Munin/Node/Server.pm`, then `lib/Munin/Node/OS.pm`. Only consider Perl runtime changes after proving runtime mishandling.
Any future source change should follow Munin conventions from `CONTRIBUTING.md` and `HACKING.pod`: `use strict; use warnings;`, taint-compatible Perl, `English qw(-no_match_vars)`, existing file indentation, and newline at EOF. Relevant local helpers are `Munin::Common::Timeout::do_with_timeout`, `Munin::Common::Logger`, and `Munin::Node::OS->run_as_child`/`reap_child_group`; prefer these over ad hoc timeout, logging, or child-management code.
No prior Fixer patch was found in the workspace to improve or replace. Avoid awkward control flow such as adding `goto`; if a real loop defect is found, use a bounded wait, return, or loop condition that fits the existing Net::Server request lifecycle.
## Risks
This area touches timeout/select behavior, so a source patch would be timing-sensitive. Without a reproducible failure and security/availability impact analysis, changing the server loop could regress normal blocking accept/read behavior or plugin timeout handling.
A speculative “fix” could turn a healthy sleeping daemon into a less reliable one, especially because `Munin::Node::Server` delegates its accept loop to `Net::Server::Fork`.
## Validation
Project-level validation attempted from workspace root:
`make` failed before tests because `Module::Build` is missing: `Can't locate Module/Build.pm in @INC ... at Build.PL line 80`.
`make check` failed because there is no `check` target: `make: *** No rule to make target 'check'. Stop.`
Focused smoke checks completed:
`perl -T -Ilib -c script/munin-node` passed.
`perl -Ilib -c lib/Munin/Node/Server.pm` passed.
Before any future source patch, run a bounded independent reproduction attempt such as starting `munin-node --foreground` with a minimal config and tracing `pselect6/select/poll` timing for several seconds. Only claim reproduction if that command shows rapid zero-timeout or near-immediate poll wakeups with meaningful CPU use.
## Patch Pass
Subject: Diagnose munin-node poll-loop evidence without patch
## Commit Message
No source change was made. The likely root cause from the collected perf, `strace`, and `/proc` evidence is normal timed blocking in munin-node’s server wait path, not a proven tight busy loop: the captured `pselect6` calls slept for about two seconds, the process was in `S (sleeping)`, and CPU was reported at 0.9%.
This follows the saved plan’s no-patch direction. I changed the evidence label from the plan’s `observed` to `inferred` because the current authoring instructions classify profiler/strace-only evidence without a local reproduction as inferred and block source patches in timing-sensitive code.
## Evidence Confidence
inferred
## Issue Connection
The collected signal is a Perl process running `/usr/sbin/munin-node --foreground` with native frames under `select()`/`pselect6`. Fixer classified this as a likely busy poll loop, but the retained syscall trace shows timed waits of roughly 1.8 to 2.0 seconds, and `/proc` showed the process sleeping with low CPU.
The code-level inference is that munin-node is waiting in its normal server path. `script/munin-node` starts `Munin::Node::Server`, which subclasses `Net::Server::Fork`; request handling uses blocking reads, `Munin::Common::Timeout::do_with_timeout`, `Munin::Common::Logger`, and `Munin::Node::OS->run_as_child`/`reap_child_group` for plugin execution. I did not find a munin-owned tight loop that matches the collected evidence.
No code was changed. Because this is timing/select behavior, a source patch would need reproduced evidence and an availability/security-impact analysis before changing waits, timeouts, or process handling. The expected effect of this no-patch diagnosis is to avoid landing a speculative upstream change against normal blocking behavior; the next useful upstream report should include a Perl-level stack or a permitted syscall trace showing rapid zero-timeout wakeups.
Project conventions checked: `CONTRIBUTING.md` and `HACKING.pod` require strict/warnings Perl, taint-compatible style, `English qw(-no_match_vars)`, local style consistency, and newline at EOF. No prior Fixer patch was present to improve or replace.
## Git Add Paths
None
## Validation
`make` from the workspace root failed before tests because `Module::Build` is missing:
```text
Can't locate Module/Build.pm in @INC ... at Build.PL line 80.
make: *** [Makefile:149: Build] Error 2
```
`make check` failed because the target does not exist:
```text
make: *** No rule to make target 'check'. Stop.
```
Focused checks run after the project-level blockers:
```text
perl -T -Ilib -c script/munin-node
script/munin-node syntax OK
perl -Ilib -c lib/Munin/Node/Server.pm
lib/Munin/Node/Server.pm syntax OK
```
Bounded reproduction attempt:
```text
timeout 6s strace -ttT -f -e trace=pselect6,select,poll,ppoll,epoll_wait,nanosleep,clock_nanosleep perl -T -Ilib script/munin-node --foreground --config /tmp/fixer-munin-node-missing.conf
```
This was blocked by environment ptrace restrictions:
```text
strace: do_test_ptrace_get_syscall_info: PTRACE_TRACEME: Operation not permitted
strace: attach: ptrace(PTRACE_SEIZE, 5): Operation not permitted
```
A plain bounded start attempt could not exercise the server loop because the requested config file did not exist:
```text
timeout 6s perl -T -Ilib script/munin-node --foreground --config /tmp/fixer-munin-node-missing.conf
ERROR: Cannot open '/tmp/fixer-munin-node-missing.conf': No such file or directory at script/munin-node line 63.
```
`git status --short` and `git diff --stat` produced no output; the workspace was left unchanged.
## Review Pass 1
RESULT: ok
No source diff is present, and that is appropriate for this evidence level. The author correctly treated the perf/strace signal as insufficient for a timing-sensitive munin-node source patch, used `inferred`, listed `Git Add Paths` as `None`, and did not claim a reproduced failure.
Validation is acceptable for a no-patch diagnosis: project-level `make` and `make check` were attempted with exact blockers, focused syntax checks were reported, and the bounded syscall-trace reproduction attempt was clearly blocked by ptrace restrictions. The write-up also names the relevant Munin docs and local helpers (`do_with_timeout`, `Munin::Common::Logger`, `run_as_child`/`reap_child_group`) and does not invent a user-visible failure beyond the evidence bundle.perl likely remains stuck in a busy-poll loop. A diagnosis report and patch proposal were created locally.
## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.
## Patch Pass
You are working on a bounded fixer proposal.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Produce the smallest reasonable patch for the target repository, keep the change upstreamable, prefer the clearest control flow available, and do not keep avoidable `goto` when a simpler structure would read better. Before introducing new file, process, allocation, locking, networking, or platform APIs, inspect nearby code and project contribution docs for existing helpers or compatibility wrappers and use those local patterns unless you can explain why they do not fit. Validate from a reproducible workspace-root entrypoint before falling back to focused leaf commands; if a build or test cannot run, report the exact command, the exact blocker, and any narrower check you ran instead. During validation, also try one bounded independent reproduction of the collected failure signal when it is safe and cheap, such as a failing test, smoke command, perf/strace comparison, or before/after runtime check. Only use `reproduced` if that command or test actually reproduced the failure; otherwise keep `observed` and report the reproduction blocker. The final explanation must connect the observed issue evidence to the actual code change, not just paraphrase the diff. Write like a maintainer is going to read the patch mail cold: explain the bug in plain language, define subsystem-specific jargon the first time you need it, and make the causal story obvious. Explicitly classify evidence confidence as `reproduced`, `observed`, or `inferred`: `reproduced` means you reproduced the failure locally; `observed` means Fixer has direct crash/log/trace evidence but you did not independently reproduce it; `inferred` means the source patch is not pull-request-ready, so do not leave a source diff unless you first gather stronger observed/reproduced evidence; otherwise return a no-patch diagnosis/report. For any source-changing `observed` patch, say explicitly in `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. Security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior need reproduced evidence plus explicit security-impact analysis before leaving a source diff; otherwise return a no-patch diagnosis/report for human review. If you introduce non-obvious state translation, index remapping, or backend split logic, add a short source comment that explains the invariant being preserved.
Start by explaining the likely root cause from the collected perf, strace, and /proc evidence. If you cannot land a safe patch, leave a diagnosis that is strong enough for an upstream bug report.
Interpreter process expectation: when the hot process is Python, Perl, shell, Node, Ruby, PHP, Lua, or another interpreter, inspect both the runtime and the script/application entrypoint from `details.interpreter_process`. Prefer the script or application package when evidence points there; do not patch the interpreter runtime merely because the hot binary is `python`, `perl`, `bash`, or similar. Runtime fixes are welcome only after checking the entrypoint and explaining why the runtime mishandles the workload or why running bad code faster/safer is itself the right upstream fix.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Keep the change narrowly scoped and summarize validation clearly.
In every authoring pass, your final response must start with `Subject: <single-line git commit subject>` and then include these markdown sections exactly:
## Commit Message
A short upstream-friendly explanation of what changed and why. Write it in plain language that a maintainer can follow without local complaint context. If you use subsystem jargon, define it immediately.
## Evidence Confidence
Exactly one word: `reproduced`, `observed`, or `inferred`. Use `reproduced` only when you reproduced the failure locally with a command or test, and include that command/test in `## Validation`. Use `observed` when Fixer has direct crash/log/trace evidence but you did not independently reproduce it. If `## Git Add Paths` lists source files for an `observed` patch, `## Issue Connection` must explicitly say the failure was observed by Fixer and not independently reproduced. Security-sensitive source changes touching authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior require reproduced evidence and explicit security-impact analysis; otherwise list `None` under `## Git Add Paths` and write a no-patch diagnosis/report. Use `inferred` for profiler/strace/indirect evidence; inferred responses may be no-patch diagnoses or reports, but inferred source patches are not pull-request-ready until stronger evidence is gathered.
## Issue Connection
Write this as maintainer-facing patch mail, not as local Fixer notes. Cover four things explicitly in readable sentences: the user-visible symptom or the exact collected signal, the code-level cause or the cautious inference from evidence, the specific change you made, and the expected effect. Do not invent a reproducer, command line, crash, or user-visible failure that is not present in the evidence bundle. If the evidence is direct-but-not-reproduced, say it was observed by Fixer and not independently reproduced. If the evidence is indirect and you did not gather stronger evidence, do not leave a source diff; write a no-patch diagnosis/report instead. Include an explicit effect sentence such as `The expected effect is ...`, `This should reduce ...`, or `This prevents ...` for source patches. If the logic is non-obvious in code, mention that you added a short explanatory comment.
## Git Add Paths
List the repo-relative paths that belong in the final patch, one per line. Use `None` only when you intentionally made no source changes. Include intentionally new files, and do not list generated build artifacts.
## Validation
List the checks you ran, or say clearly that you could not run them. Include the independent reproduction command/test and result when `## Evidence Confidence` is `reproduced`; if reproduction was attempted but blocked, name the exact blocker and keep confidence at `observed` or `inferred`.
Before editing, read the plan at `./plan-output.txt` and follow it unless the code proves part of it wrong. If you change course, say so explicitly in the final write-up instead of silently drifting from the plan.
## Review Pass 1
You are reviewing a freshly generated fixer patch.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Review the first patch pass. The original pre-edit snapshot is available at `./source` for diffing.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout. The latest author response is at `./patch-output.txt`. Inspect the current code and changed paths like a strict code reviewer. Focus on correctness, regressions, maintainability, awkward control flow such as avoidable `goto`, missing validation, weak or non-gittable commit message text, and explanations that fail to connect the observed issue evidence to the code change. Also review the maintainer experience: the patch mail should be easy to accept upstream, the user-visible bug should be explained in plain language, subsystem-specific jargon should be defined when first used, and any non-obvious state translation or index remapping in code should have a short explanatory comment. Reject patches that omit `## Evidence Confidence`, use anything other than `reproduced`, `observed`, or `inferred`, or sound more certain than that evidence level allows. Reject patches that claim `reproduced` unless `## Validation` names the concrete reproduction command or test and its result. Reject source patches in security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior unless the author reproduced the behavior and explicitly analyzed the security impact of the change; observed-only evidence should become a diagnosis/report, not a PR-ready source diff. Reject patches that invent a reproducer, command line, crash, or user-visible failure not present in the evidence bundle; indirect profiler or strace evidence may justify a cautious mitigation, but the author must say it is indirect instead of presenting it as a confirmed upstream bug. Reject patches that introduce generic libc/std APIs when nearby code or project docs provide a local compat/helper API for the same job, unless the author explicitly justifies the exception. Reject validation that only reports a leaf object/syntax build when a project-level configure/build/test entrypoint exists and was not attempted; if a full build cannot run, the author must show the exact failed command and blocker.
Do not apply code changes in this pass.
Return a short markdown review report. The first non-empty line must be exactly one of:
RESULT: ok
RESULT: fix-needed
If you choose `RESULT: fix-needed`, add a `## Findings` section with concrete, actionable items.## Plan Pass
## Problem
Fixer observed `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` in a poll-family syscall path, but the retained `strace` shows `pselect6` calls blocking for about 1.8 to 2.0 seconds, process state `S (sleeping)`, and only 0.9% CPU. The evidence does not include a Perl-level stack or a munin-node command/session tying the sampled native frame to a tight application loop.
## Evidence Confidence
observed
## Proposed Subject
No source patch yet: document insufficient evidence for a munin busy-poll fix and collect a Perl/application-level reproduction before editing.
## Patch Plan
Do not edit munin in this pass. The current evidence is profiler-only/indirect and appears internally mixed: it labels a busy-poll loop, but the captured syscalls are timed sleeps rather than immediate wakeups.
If more evidence is collected before editing, investigate the script entrypoint first: `script/munin-node`, then `lib/Munin/Node/Server.pm`, then `lib/Munin/Node/OS.pm`. Only consider Perl runtime changes after proving runtime mishandling.
Any future source change should follow Munin conventions from `CONTRIBUTING.md` and `HACKING.pod`: `use strict; use warnings;`, taint-compatible Perl, `English qw(-no_match_vars)`, existing file indentation, and newline at EOF. Relevant local helpers are `Munin::Common::Timeout::do_with_timeout`, `Munin::Common::Logger`, and `Munin::Node::OS->run_as_child`/`reap_child_group`; prefer these over ad hoc timeout, logging, or child-management code.
No prior Fixer patch was found in the workspace to improve or replace. Avoid awkward control flow such as adding `goto`; if a real loop defect is found, use a bounded wait, return, or loop condition that fits the existing Net::Server request lifecycle.
## Risks
This area touches timeout/select behavior, so a source patch would be timing-sensitive. Without a reproducible failure and security/availability impact analysis, changing the server loop could regress normal blocking accept/read behavior or plugin timeout handling.
A speculative “fix” could turn a healthy sleeping daemon into a less reliable one, especially because `Munin::Node::Server` delegates its accept loop to `Net::Server::Fork`.
## Validation
Project-level validation attempted from workspace root:
`make` failed before tests because `Module::Build` is missing: `Can't locate Module/Build.pm in @INC ... at Build.PL line 80`.
`make check` failed because there is no `check` target: `make: *** No rule to make target 'check'. Stop.`
Focused smoke checks completed:
`perl -T -Ilib -c script/munin-node` passed.
`perl -Ilib -c lib/Munin/Node/Server.pm` passed.
Before any future source patch, run a bounded independent reproduction attempt such as starting `munin-node --foreground` with a minimal config and tracing `pselect6/select/poll` timing for several seconds. Only claim reproduction if that command shows rapid zero-timeout or near-immediate poll wakeups with meaningful CPU use.
## Patch Pass
Subject: Diagnose munin-node poll-loop evidence without patch
## Commit Message
No source change was made. The likely root cause from the collected perf, `strace`, and `/proc` evidence is normal timed blocking in munin-node’s server wait path, not a proven tight busy loop: the captured `pselect6` calls slept for about two seconds, the process was in `S (sleeping)`, and CPU was reported at 0.9%.
This follows the saved plan’s no-patch direction. I changed the evidence label from the plan’s `observed` to `inferred` because the current authoring instructions classify profiler/strace-only evidence without a local reproduction as inferred and block source patches in timing-sensitive code.
## Evidence Confidence
inferred
## Issue Connection
The collected signal is a Perl process running `/usr/sbin/munin-node --foreground` with native frames under `select()`/`pselect6`. Fixer classified this as a likely busy poll loop, but the retained syscall trace shows timed waits of roughly 1.8 to 2.0 seconds, and `/proc` showed the process sleeping with low CPU.
The code-level inference is that munin-node is waiting in its normal server path. `script/munin-node` starts `Munin::Node::Server`, which subclasses `Net::Server::Fork`; request handling uses blocking reads, `Munin::Common::Timeout::do_with_timeout`, `Munin::Common::Logger`, and `Munin::Node::OS->run_as_child`/`reap_child_group` for plugin execution. I did not find a munin-owned tight loop that matches the collected evidence.
No code was changed. Because this is timing/select behavior, a source patch would need reproduced evidence and an availability/security-impact analysis before changing waits, timeouts, or process handling. The expected effect of this no-patch diagnosis is to avoid landing a speculative upstream change against normal blocking behavior; the next useful upstream report should include a Perl-level stack or a permitted syscall trace showing rapid zero-timeout wakeups.
Project conventions checked: `CONTRIBUTING.md` and `HACKING.pod` require strict/warnings Perl, taint-compatible style, `English qw(-no_match_vars)`, local style consistency, and newline at EOF. No prior Fixer patch was present to improve or replace.
## Git Add Paths
None
## Validation
`make` from the workspace root failed before tests because `Module::Build` is missing:
```text
Can't locate Module/Build.pm in @INC ... at Build.PL line 80.
make: *** [Makefile:149: Build] Error 2
```
`make check` failed because the target does not exist:
```text
make: *** No rule to make target 'check'. Stop.
```
Focused checks run after the project-level blockers:
```text
perl -T -Ilib -c script/munin-node
script/munin-node syntax OK
perl -Ilib -c lib/Munin/Node/Server.pm
lib/Munin/Node/Server.pm syntax OK
```
Bounded reproduction attempt:
```text
timeout 6s strace -ttT -f -e trace=pselect6,select,poll,ppoll,epoll_wait,nanosleep,clock_nanosleep perl -T -Ilib script/munin-node --foreground --config /tmp/fixer-munin-node-missing.conf
```
This was blocked by environment ptrace restrictions:
```text
strace: do_test_ptrace_get_syscall_info: PTRACE_TRACEME: Operation not permitted
strace: attach: ptrace(PTRACE_SEIZE, 5): Operation not permitted
```
A plain bounded start attempt could not exercise the server loop because the requested config file did not exist:
```text
timeout 6s perl -T -Ilib script/munin-node --foreground --config /tmp/fixer-munin-node-missing.conf
ERROR: Cannot open '/tmp/fixer-munin-node-missing.conf': No such file or directory at script/munin-node line 63.
```
`git status --short` and `git diff --stat` produced no output; the workspace was left unchanged.
## Review Pass 1
RESULT: ok
No source diff is present, and that is appropriate for this evidence level. The author correctly treated the perf/strace signal as insufficient for a timing-sensitive munin-node source patch, used `inferred`, listed `Git Add Paths` as `None`, and did not claim a reproduced failure.
Validation is acceptable for a no-patch diagnosis: project-level `make` and `make check` were attempted with exact blockers, focused syntax checks were reported, and the bounded syscall-trace reproduction attempt was clearly blocked by ptrace restrictions. The write-up also names the relevant Munin docs and local helpers (`do_with_timeout`, `Munin::Common::Logger`, `run_as_child`/`reap_child_group`) and does not invent a user-visible failure beyond the evidence bundle.perl likely remains stuck in a busy-poll loop. A diagnosis report and patch proposal were created locally.
## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.
## Patch Pass
You are working on a bounded fixer proposal.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Produce the smallest reasonable patch for the target repository, keep the change upstreamable, prefer the clearest control flow available, and do not keep avoidable `goto` when a simpler structure would read better. Before introducing new file, process, allocation, locking, networking, or platform APIs, inspect nearby code and project contribution docs for existing helpers or compatibility wrappers and use those local patterns unless you can explain why they do not fit. Validate from a reproducible workspace-root entrypoint before falling back to focused leaf commands; if a build or test cannot run, report the exact command, the exact blocker, and any narrower check you ran instead. During validation, also try one bounded independent reproduction of the collected failure signal when it is safe and cheap, such as a failing test, smoke command, perf/strace comparison, or before/after runtime check. Only use `reproduced` if that command or test actually reproduced the failure; otherwise keep `observed` and report the reproduction blocker. The final explanation must connect the observed issue evidence to the actual code change, not just paraphrase the diff. Write like a maintainer is going to read the patch mail cold: explain the bug in plain language, define subsystem-specific jargon the first time you need it, and make the causal story obvious. Explicitly classify evidence confidence as `reproduced`, `observed`, or `inferred`: `reproduced` means you reproduced the failure locally; `observed` means Fixer has direct crash/log/trace evidence but you did not independently reproduce it; `inferred` means the source patch is not pull-request-ready, so do not leave a source diff unless you first gather stronger observed/reproduced evidence; otherwise return a no-patch diagnosis/report. For any source-changing `observed` patch, say explicitly in `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. Security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior need reproduced evidence plus explicit security-impact analysis before leaving a source diff; otherwise return a no-patch diagnosis/report for human review. If you introduce non-obvious state translation, index remapping, or backend split logic, add a short source comment that explains the invariant being preserved.
Start by explaining the likely root cause from the collected perf, strace, and /proc evidence. If you cannot land a safe patch, leave a diagnosis that is strong enough for an upstream bug report.
Interpreter process expectation: when the hot process is Python, Perl, shell, Node, Ruby, PHP, Lua, or another interpreter, inspect both the runtime and the script/application entrypoint from `details.interpreter_process`. Prefer the script or application package when evidence points there; do not patch the interpreter runtime merely because the hot binary is `python`, `perl`, `bash`, or similar. Runtime fixes are welcome only after checking the entrypoint and explaining why the runtime mishandles the workload or why running bad code faster/safer is itself the right upstream fix.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Keep the change narrowly scoped and summarize validation clearly.
In every authoring pass, your final response must start with `Subject: <single-line git commit subject>` and then include these markdown sections exactly:
## Commit Message
A short upstream-friendly explanation of what changed and why. Write it in plain language that a maintainer can follow without local complaint context. If you use subsystem jargon, define it immediately.
## Evidence Confidence
Exactly one word: `reproduced`, `observed`, or `inferred`. Use `reproduced` only when you reproduced the failure locally with a command or test, and include that command/test in `## Validation`. Use `observed` when Fixer has direct crash/log/trace evidence but you did not independently reproduce it. If `## Git Add Paths` lists source files for an `observed` patch, `## Issue Connection` must explicitly say the failure was observed by Fixer and not independently reproduced. Security-sensitive source changes touching authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior require reproduced evidence and explicit security-impact analysis; otherwise list `None` under `## Git Add Paths` and write a no-patch diagnosis/report. Use `inferred` for profiler/strace/indirect evidence; inferred responses may be no-patch diagnoses or reports, but inferred source patches are not pull-request-ready until stronger evidence is gathered.
## Issue Connection
Write this as maintainer-facing patch mail, not as local Fixer notes. Cover four things explicitly in readable sentences: the user-visible symptom or the exact collected signal, the code-level cause or the cautious inference from evidence, the specific change you made, and the expected effect. Do not invent a reproducer, command line, crash, or user-visible failure that is not present in the evidence bundle. If the evidence is direct-but-not-reproduced, say it was observed by Fixer and not independently reproduced. If the evidence is indirect and you did not gather stronger evidence, do not leave a source diff; write a no-patch diagnosis/report instead. Include an explicit effect sentence such as `The expected effect is ...`, `This should reduce ...`, or `This prevents ...` for source patches. If the logic is non-obvious in code, mention that you added a short explanatory comment.
## Git Add Paths
List the repo-relative paths that belong in the final patch, one per line. Use `None` only when you intentionally made no source changes. Include intentionally new files, and do not list generated build artifacts.
## Validation
List the checks you ran, or say clearly that you could not run them. Include the independent reproduction command/test and result when `## Evidence Confidence` is `reproduced`; if reproduction was attempted but blocked, name the exact blocker and keep confidence at `observed` or `inferred`.
Before editing, read the plan at `./plan-output.txt` and follow it unless the code proves part of it wrong. If you change course, say so explicitly in the final write-up instead of silently drifting from the plan.
## Review Pass 1
You are reviewing a freshly generated fixer patch.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Review the first patch pass. The original pre-edit snapshot is available at `./source` for diffing.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout. The latest author response is at `./patch-output.txt`. Inspect the current code and changed paths like a strict code reviewer. Focus on correctness, regressions, maintainability, awkward control flow such as avoidable `goto`, missing validation, weak or non-gittable commit message text, and explanations that fail to connect the observed issue evidence to the code change. Also review the maintainer experience: the patch mail should be easy to accept upstream, the user-visible bug should be explained in plain language, subsystem-specific jargon should be defined when first used, and any non-obvious state translation or index remapping in code should have a short explanatory comment. Reject patches that omit `## Evidence Confidence`, use anything other than `reproduced`, `observed`, or `inferred`, or sound more certain than that evidence level allows. Reject patches that claim `reproduced` unless `## Validation` names the concrete reproduction command or test and its result. Reject source patches in security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior unless the author reproduced the behavior and explicitly analyzed the security impact of the change; observed-only evidence should become a diagnosis/report, not a PR-ready source diff. Reject patches that invent a reproducer, command line, crash, or user-visible failure not present in the evidence bundle; indirect profiler or strace evidence may justify a cautious mitigation, but the author must say it is indirect instead of presenting it as a confirmed upstream bug. Reject patches that introduce generic libc/std APIs when nearby code or project docs provide a local compat/helper API for the same job, unless the author explicitly justifies the exception. Reject validation that only reports a leaf object/syntax build when a project-level configure/build/test entrypoint exists and was not attempted; if a full build cannot run, the author must show the exact failed command and blocker.
Do not apply code changes in this pass.
Return a short markdown review report. The first non-empty line must be exactly one of:
RESULT: ok
RESULT: fix-needed
If you choose `RESULT: fix-needed`, add a `## Findings` section with concrete, actionable items.## Plan Pass
## Problem
Fixer flagged `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` as a runaway Perl process, but the retained evidence shows `munin-node` sleeping in `pselect6` with ~1.8s and ~2.0s timeouts, process state `S`, and only ~0.9% CPU. `munin-node` subclasses `Net::Server::Fork`; that runtime’s accept loop calls `can_read(2)`, so the observed cadence matches a normal idle listener more than a proven busy poll.
## Evidence Confidence
observed
## Proposed Subject
No source patch yet: diagnose the report as insufficient evidence for a Munin CPU-loop fix.
## Patch Plan
Do not edit Munin in this pass. The evidence does not tie a tight loop to `script/munin-node`, `lib/Munin/Node/Server.pm`, plugin execution, or the Perl runtime.
If more evidence is collected before a future edit, investigate the script/application entrypoint first, not Perl. Relevant local code and conventions found: `script/munin-node` builds config and runs `Munin::Node::Server`; `Munin::Node::Server` uses `Net::Server::Fork`, `Munin::Common::Timeout::do_with_timeout`, and logger helpers such as `DEBUG`, `NOTICE`, and `ERROR`. `CONTRIBUTING.md` and `HACKING.pod` require strict/warnings, taint-mode compatibility, one statement per line, and following local file style.
A future source patch should only proceed if a bounded reproduction shows high CPU or near-zero timeout `pselect`/`select` churn attributable to Munin code. If that happens, prefer a small bounded change in the node server/request loop or config handling using existing helpers; avoid awkward control flow such as `goto`. No prior Fixer patch was found; Debian patches present are unrelated packaging patches and should not be replaced for this issue.
## Risks
Changing accept-loop timing without reproduction would alter daemon wakeup, signal/HUP handling, and connection latency for a normal `Net::Server::Fork` server. Because this concerns timing/throttling behavior, a source patch should be blocked unless validation reproduces the problematic behavior and explains the impact.
## Validation
First try project-level commands from the workspace root: `make`, then `make test`. `make check` is not exposed by this Makefile.
For an independent bounded reproduction attempt, run an idle foreground node under `strace` with a temporary minimal config and inspect `pselect6` timing plus CPU, for example `timeout 8 strace -ttT -f -e trace=pselect6,select,poll,ppoll perl -Ilib -wT script/munin-node --foreground --config /tmp/munin-node-test.conf`. Claim only “observed, not reproduced” unless that command actually shows high CPU or tight near-immediate wakeups.
## Patch Pass
Subject: Diagnose munin-node idle select evidence
## Commit Message
No source change is proposed. The collected `pselect6` samples match `Net::Server::Fork`’s normal idle accept loop, which waits up to two seconds for a connection, and the local environment could not reproduce a tight CPU loop safely.
## Evidence Confidence
observed
## Issue Connection
Fixer observed `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` in repeated `pselect6` calls with stack frames under Perl `select()`, but the same evidence also shows `State: S (sleeping)`, `wchan: poll_schedule_timeout.constprop.0`, and only about `0.9%` CPU. The retained `strace` excerpt has timed waits of about `1.8s` and `2.0s`, not immediate wakeups.
The likely root cause is a false-positive runaway classification: `munin-node` runs `Munin::Node::Server`, a `Net::Server::Fork` subclass, and the installed `Net::Server::Fork` accept path calls `can_read(2)`. That framework wait explains the observed two-second `pselect6` cadence without requiring a Munin application-loop bug or a Perl runtime bug.
I followed the saved plan and did not change course: this touches timing/throttling behavior, so a source patch would need reproduced evidence plus impact analysis. I found relevant local patterns and helpers: `Munin::Common::Timeout::do_with_timeout` for request/plugin timeouts, `Munin::Common::Logger` helpers such as `DEBUG`/`ERROR`, and the `CONTRIBUTING.md`/`HACKING.pod` style expectations for strict/warnings and taint-compatible Perl. No prior Fixer patch needed replacement.
No code change was made. The expected effect of this proposal is to avoid an upstream timing patch for a signal that currently looks like normal idle listener behavior, and to leave a clear upstream bug-report diagnosis instead.
## Git Add Paths
None
## Validation
`make` from the workspace root failed before running project code:
`Can't locate Module/Build.pm in @INC ... at Build.PL line 80`, followed by `make: *** [Makefile:149: Build] Error 2`.
`make check` from the workspace root failed because this Makefile has no `check` target:
`make: *** No rule to make target 'check'. Stop.`
Focused syntax check run:
`perl -c lib/Munin/Node/Server.pm` passed with `syntax OK`.
Independent reproduction attempt:
`timeout 7 strace -ttT -f -e trace=pselect6,select,poll,ppoll perl -MNet::Server::Fork -e '...'` was blocked by sandbox ptrace restrictions: `PTRACE_TRACEME: Operation not permitted`.
Fallback `Net::Server::Fork` smoke attempt was also blocked by sandbox networking:
`Cannot bind and listen to TCP port 49490 on 127.0.0.1 [Operation not permitted]`.
Because the tight-loop failure was not independently reproduced, confidence remains `observed` and no source diff is left.
## Review Pass 1
RESULT: ok
No source diff is present, which is appropriate for this evidence level and timing-sensitive subsystem. The patch output includes `## Evidence Confidence` with valid value `observed`, does not claim local reproduction, reports the project-level validation blockers, and explains why the collected `pselect6` samples likely match `Net::Server::Fork`’s normal two-second idle accept wait rather than a confirmed Munin CPU loop.
I found no review-blocking issues.perl likely remains stuck in a busy-poll loop. A diagnosis report and patch proposal were created locally.
## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.
## Patch Pass
You are working on a bounded fixer proposal.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Produce the smallest reasonable patch for the target repository, keep the change upstreamable, prefer the clearest control flow available, and do not keep avoidable `goto` when a simpler structure would read better. Before introducing new file, process, allocation, locking, networking, or platform APIs, inspect nearby code and project contribution docs for existing helpers or compatibility wrappers and use those local patterns unless you can explain why they do not fit. Validate from a reproducible workspace-root entrypoint before falling back to focused leaf commands; if a build or test cannot run, report the exact command, the exact blocker, and any narrower check you ran instead. During validation, also try one bounded independent reproduction of the collected failure signal when it is safe and cheap, such as a failing test, smoke command, perf/strace comparison, or before/after runtime check. Only use `reproduced` if that command or test actually reproduced the failure; otherwise keep `observed` and report the reproduction blocker. The final explanation must connect the observed issue evidence to the actual code change, not just paraphrase the diff. Write like a maintainer is going to read the patch mail cold: explain the bug in plain language, define subsystem-specific jargon the first time you need it, and make the causal story obvious. Explicitly classify evidence confidence as `reproduced`, `observed`, or `inferred`: `reproduced` means you reproduced the failure locally; `observed` means Fixer has direct crash/log/trace evidence but you did not independently reproduce it; `inferred` means the source patch is not pull-request-ready, so do not leave a source diff unless you first gather stronger observed/reproduced evidence; otherwise return a no-patch diagnosis/report. For any source-changing `observed` patch, say explicitly in `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. Security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior need reproduced evidence plus explicit security-impact analysis before leaving a source diff; otherwise return a no-patch diagnosis/report for human review. If you introduce non-obvious state translation, index remapping, or backend split logic, add a short source comment that explains the invariant being preserved.
Start by explaining the likely root cause from the collected perf, strace, and /proc evidence. If you cannot land a safe patch, leave a diagnosis that is strong enough for an upstream bug report.
Interpreter process expectation: when the hot process is Python, Perl, shell, Node, Ruby, PHP, Lua, or another interpreter, inspect both the runtime and the script/application entrypoint from `details.interpreter_process`. Prefer the script or application package when evidence points there; do not patch the interpreter runtime merely because the hot binary is `python`, `perl`, `bash`, or similar. Runtime fixes are welcome only after checking the entrypoint and explaining why the runtime mishandles the workload or why running bad code faster/safer is itself the right upstream fix.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Keep the change narrowly scoped and summarize validation clearly.
In every authoring pass, your final response must start with `Subject: <single-line git commit subject>` and then include these markdown sections exactly:
## Commit Message
A short upstream-friendly explanation of what changed and why. Write it in plain language that a maintainer can follow without local complaint context. If you use subsystem jargon, define it immediately.
## Evidence Confidence
Exactly one word: `reproduced`, `observed`, or `inferred`. Use `reproduced` only when you reproduced the failure locally with a command or test, and include that command/test in `## Validation`. Use `observed` when Fixer has direct crash/log/trace evidence but you did not independently reproduce it. If `## Git Add Paths` lists source files for an `observed` patch, `## Issue Connection` must explicitly say the failure was observed by Fixer and not independently reproduced. Security-sensitive source changes touching authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior require reproduced evidence and explicit security-impact analysis; otherwise list `None` under `## Git Add Paths` and write a no-patch diagnosis/report. Use `inferred` for profiler/strace/indirect evidence; inferred responses may be no-patch diagnoses or reports, but inferred source patches are not pull-request-ready until stronger evidence is gathered.
## Issue Connection
Write this as maintainer-facing patch mail, not as local Fixer notes. Cover four things explicitly in readable sentences: the user-visible symptom or the exact collected signal, the code-level cause or the cautious inference from evidence, the specific change you made, and the expected effect. Do not invent a reproducer, command line, crash, or user-visible failure that is not present in the evidence bundle. If the evidence is direct-but-not-reproduced, say it was observed by Fixer and not independently reproduced. If the evidence is indirect and you did not gather stronger evidence, do not leave a source diff; write a no-patch diagnosis/report instead. Include an explicit effect sentence such as `The expected effect is ...`, `This should reduce ...`, or `This prevents ...` for source patches. If the logic is non-obvious in code, mention that you added a short explanatory comment.
## Git Add Paths
List the repo-relative paths that belong in the final patch, one per line. Use `None` only when you intentionally made no source changes. Include intentionally new files, and do not list generated build artifacts.
## Validation
List the checks you ran, or say clearly that you could not run them. Include the independent reproduction command/test and result when `## Evidence Confidence` is `reproduced`; if reproduction was attempted but blocked, name the exact blocker and keep confidence at `observed` or `inferred`.
Before editing, read the plan at `./plan-output.txt` and follow it unless the code proves part of it wrong. If you change course, say so explicitly in the final write-up instead of silently drifting from the plan.
## Review Pass 1
You are reviewing a freshly generated fixer patch.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Review the first patch pass. The original pre-edit snapshot is available at `./source` for diffing.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout. The latest author response is at `./patch-output.txt`. Inspect the current code and changed paths like a strict code reviewer. Focus on correctness, regressions, maintainability, awkward control flow such as avoidable `goto`, missing validation, weak or non-gittable commit message text, and explanations that fail to connect the observed issue evidence to the code change. Also review the maintainer experience: the patch mail should be easy to accept upstream, the user-visible bug should be explained in plain language, subsystem-specific jargon should be defined when first used, and any non-obvious state translation or index remapping in code should have a short explanatory comment. Reject patches that omit `## Evidence Confidence`, use anything other than `reproduced`, `observed`, or `inferred`, or sound more certain than that evidence level allows. Reject patches that claim `reproduced` unless `## Validation` names the concrete reproduction command or test and its result. Reject source patches in security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior unless the author reproduced the behavior and explicitly analyzed the security impact of the change; observed-only evidence should become a diagnosis/report, not a PR-ready source diff. Reject patches that invent a reproducer, command line, crash, or user-visible failure not present in the evidence bundle; indirect profiler or strace evidence may justify a cautious mitigation, but the author must say it is indirect instead of presenting it as a confirmed upstream bug. Reject patches that introduce generic libc/std APIs when nearby code or project docs provide a local compat/helper API for the same job, unless the author explicitly justifies the exception. Reject validation that only reports a leaf object/syntax build when a project-level configure/build/test entrypoint exists and was not attempted; if a full build cannot run, the author must show the exact failed command and blocker.
Do not apply code changes in this pass.
Return a short markdown review report. The first non-empty line must be exactly one of:
RESULT: ok
RESULT: fix-needed
If you choose `RESULT: fix-needed`, add a `## Findings` section with concrete, actionable items.## Plan Pass
## Problem
Fixer flagged `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` as a runaway Perl process, but the retained evidence shows `munin-node` sleeping in `pselect6` with ~1.8s and ~2.0s timeouts, process state `S`, and only ~0.9% CPU. `munin-node` subclasses `Net::Server::Fork`; that runtime’s accept loop calls `can_read(2)`, so the observed cadence matches a normal idle listener more than a proven busy poll.
## Evidence Confidence
observed
## Proposed Subject
No source patch yet: diagnose the report as insufficient evidence for a Munin CPU-loop fix.
## Patch Plan
Do not edit Munin in this pass. The evidence does not tie a tight loop to `script/munin-node`, `lib/Munin/Node/Server.pm`, plugin execution, or the Perl runtime.
If more evidence is collected before a future edit, investigate the script/application entrypoint first, not Perl. Relevant local code and conventions found: `script/munin-node` builds config and runs `Munin::Node::Server`; `Munin::Node::Server` uses `Net::Server::Fork`, `Munin::Common::Timeout::do_with_timeout`, and logger helpers such as `DEBUG`, `NOTICE`, and `ERROR`. `CONTRIBUTING.md` and `HACKING.pod` require strict/warnings, taint-mode compatibility, one statement per line, and following local file style.
A future source patch should only proceed if a bounded reproduction shows high CPU or near-zero timeout `pselect`/`select` churn attributable to Munin code. If that happens, prefer a small bounded change in the node server/request loop or config handling using existing helpers; avoid awkward control flow such as `goto`. No prior Fixer patch was found; Debian patches present are unrelated packaging patches and should not be replaced for this issue.
## Risks
Changing accept-loop timing without reproduction would alter daemon wakeup, signal/HUP handling, and connection latency for a normal `Net::Server::Fork` server. Because this concerns timing/throttling behavior, a source patch should be blocked unless validation reproduces the problematic behavior and explains the impact.
## Validation
First try project-level commands from the workspace root: `make`, then `make test`. `make check` is not exposed by this Makefile.
For an independent bounded reproduction attempt, run an idle foreground node under `strace` with a temporary minimal config and inspect `pselect6` timing plus CPU, for example `timeout 8 strace -ttT -f -e trace=pselect6,select,poll,ppoll perl -Ilib -wT script/munin-node --foreground --config /tmp/munin-node-test.conf`. Claim only “observed, not reproduced” unless that command actually shows high CPU or tight near-immediate wakeups.
## Patch Pass
Subject: Diagnose munin-node idle select evidence
## Commit Message
No source change is proposed. The collected `pselect6` samples match `Net::Server::Fork`’s normal idle accept loop, which waits up to two seconds for a connection, and the local environment could not reproduce a tight CPU loop safely.
## Evidence Confidence
observed
## Issue Connection
Fixer observed `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` in repeated `pselect6` calls with stack frames under Perl `select()`, but the same evidence also shows `State: S (sleeping)`, `wchan: poll_schedule_timeout.constprop.0`, and only about `0.9%` CPU. The retained `strace` excerpt has timed waits of about `1.8s` and `2.0s`, not immediate wakeups.
The likely root cause is a false-positive runaway classification: `munin-node` runs `Munin::Node::Server`, a `Net::Server::Fork` subclass, and the installed `Net::Server::Fork` accept path calls `can_read(2)`. That framework wait explains the observed two-second `pselect6` cadence without requiring a Munin application-loop bug or a Perl runtime bug.
I followed the saved plan and did not change course: this touches timing/throttling behavior, so a source patch would need reproduced evidence plus impact analysis. I found relevant local patterns and helpers: `Munin::Common::Timeout::do_with_timeout` for request/plugin timeouts, `Munin::Common::Logger` helpers such as `DEBUG`/`ERROR`, and the `CONTRIBUTING.md`/`HACKING.pod` style expectations for strict/warnings and taint-compatible Perl. No prior Fixer patch needed replacement.
No code change was made. The expected effect of this proposal is to avoid an upstream timing patch for a signal that currently looks like normal idle listener behavior, and to leave a clear upstream bug-report diagnosis instead.
## Git Add Paths
None
## Validation
`make` from the workspace root failed before running project code:
`Can't locate Module/Build.pm in @INC ... at Build.PL line 80`, followed by `make: *** [Makefile:149: Build] Error 2`.
`make check` from the workspace root failed because this Makefile has no `check` target:
`make: *** No rule to make target 'check'. Stop.`
Focused syntax check run:
`perl -c lib/Munin/Node/Server.pm` passed with `syntax OK`.
Independent reproduction attempt:
`timeout 7 strace -ttT -f -e trace=pselect6,select,poll,ppoll perl -MNet::Server::Fork -e '...'` was blocked by sandbox ptrace restrictions: `PTRACE_TRACEME: Operation not permitted`.
Fallback `Net::Server::Fork` smoke attempt was also blocked by sandbox networking:
`Cannot bind and listen to TCP port 49490 on 127.0.0.1 [Operation not permitted]`.
Because the tight-loop failure was not independently reproduced, confidence remains `observed` and no source diff is left.
## Review Pass 1
RESULT: ok
No source diff is present, which is appropriate for this evidence level and timing-sensitive subsystem. The patch output includes `## Evidence Confidence` with valid value `observed`, does not claim local reproduction, reports the project-level validation blockers, and explains why the collected `pselect6` samples likely match `Net::Server::Fork`’s normal two-second idle accept wait rather than a confirmed Munin CPU loop.
I found no review-blocking issues.perl likely remains stuck in a busy-poll loop. The diagnosis was captured, but the patch proposal did not complete cleanly.
timeout
Codex stage timed out after 900 second(s)./usr/bin/perl -wT /usr/sbin/munin-node --foregroundThe trace repeatedly returns to a poll-family syscall without meaningful blocking, which suggests a busy event-loop wakeup.
Thread 1 (Thread 0x7f82eb914b80 (LWP 3947104) "munin-node"):
#0 0x00007f82eb9e87d2 in ?? () from target:<path>
#1 0x00007f82eb9e87ed in ?? () from target:<path>
#2 0x00007f82eba686cf in select () from target:<path>
#3 0x000055b5551b8ee4 in ?? ()
#4 0x000055b55521a496 in Perl_runops_standard ()
#5 0x000055b555100b85 in perl_run ()
#6 0x000055b5550d35ae in main ()## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.## Plan Pass
## Workflow Note
Codex stage timed out after 900 second(s).perl likely remains stuck in a busy-poll loop. The diagnosis was captured, but the patch proposal did not complete cleanly.
timeout
Codex stage timed out after 900 second(s)./usr/bin/perl -wT /usr/sbin/munin-node --foregroundThe trace repeatedly returns to a poll-family syscall without meaningful blocking, which suggests a busy event-loop wakeup.
Thread 1 (Thread 0x7f82eb914b80 (LWP 3947104) "munin-node"):
#0 0x00007f82eb9e87d2 in ?? () from target:<path>
#1 0x00007f82eb9e87ed in ?? () from target:<path>
#2 0x00007f82eba686cf in select () from target:<path>
#3 0x000055b5551b8ee4 in ?? ()
#4 0x000055b55521a496 in Perl_runops_standard ()
#5 0x000055b555100b85 in perl_run ()
#6 0x000055b5550d35ae in main ()## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.## Plan Pass
## Workflow Note
Codex stage timed out after 900 second(s).perl likely remains stuck in a busy-poll loop. A diagnosis report and patch proposal were created locally.
## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.
## Patch Pass
You are working on a bounded fixer proposal.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Produce the smallest reasonable patch for the target repository, keep the change upstreamable, prefer the clearest control flow available, and do not keep avoidable `goto` when a simpler structure would read better. Before introducing new file, process, allocation, locking, networking, or platform APIs, inspect nearby code and project contribution docs for existing helpers or compatibility wrappers and use those local patterns unless you can explain why they do not fit. Validate from a reproducible workspace-root entrypoint before falling back to focused leaf commands; if a build or test cannot run, report the exact command, the exact blocker, and any narrower check you ran instead. During validation, also try one bounded independent reproduction of the collected failure signal when it is safe and cheap, such as a failing test, smoke command, perf/strace comparison, or before/after runtime check. Only use `reproduced` if that command or test actually reproduced the failure; otherwise keep `observed` and report the reproduction blocker. The final explanation must connect the observed issue evidence to the actual code change, not just paraphrase the diff. Write like a maintainer is going to read the patch mail cold: explain the bug in plain language, define subsystem-specific jargon the first time you need it, and make the causal story obvious. Explicitly classify evidence confidence as `reproduced`, `observed`, or `inferred`: `reproduced` means you reproduced the failure locally; `observed` means Fixer has direct crash/log/trace evidence but you did not independently reproduce it; `inferred` means the source patch is not pull-request-ready, so do not leave a source diff unless you first gather stronger observed/reproduced evidence; otherwise return a no-patch diagnosis/report. For any source-changing `observed` patch, say explicitly in `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. Security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior need reproduced evidence plus explicit security-impact analysis before leaving a source diff; otherwise return a no-patch diagnosis/report for human review. If you introduce non-obvious state translation, index remapping, or backend split logic, add a short source comment that explains the invariant being preserved.
Start by explaining the likely root cause from the collected perf, strace, and /proc evidence. If you cannot land a safe patch, leave a diagnosis that is strong enough for an upstream bug report.
Interpreter process expectation: when the hot process is Python, Perl, shell, Node, Ruby, PHP, Lua, or another interpreter, inspect both the runtime and the script/application entrypoint from `details.interpreter_process`. Prefer the script or application package when evidence points there; do not patch the interpreter runtime merely because the hot binary is `python`, `perl`, `bash`, or similar. Runtime fixes are welcome only after checking the entrypoint and explaining why the runtime mishandles the workload or why running bad code faster/safer is itself the right upstream fix.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Keep the change narrowly scoped and summarize validation clearly.
In every authoring pass, your final response must start with `Subject: <single-line git commit subject>` and then include these markdown sections exactly:
## Commit Message
A short upstream-friendly explanation of what changed and why. Write it in plain language that a maintainer can follow without local complaint context. If you use subsystem jargon, define it immediately.
## Evidence Confidence
Exactly one word: `reproduced`, `observed`, or `inferred`. Use `reproduced` only when you reproduced the failure locally with a command or test, and include that command/test in `## Validation`. Use `observed` when Fixer has direct crash/log/trace evidence but you did not independently reproduce it. If `## Git Add Paths` lists source files for an `observed` patch, `## Issue Connection` must explicitly say the failure was observed by Fixer and not independently reproduced. Security-sensitive source changes touching authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior require reproduced evidence and explicit security-impact analysis; otherwise list `None` under `## Git Add Paths` and write a no-patch diagnosis/report. Use `inferred` for profiler/strace/indirect evidence; inferred responses may be no-patch diagnoses or reports, but inferred source patches are not pull-request-ready until stronger evidence is gathered.
## Issue Connection
Write this as maintainer-facing patch mail, not as local Fixer notes. Cover four things explicitly in readable sentences: the user-visible symptom or the exact collected signal, the code-level cause or the cautious inference from evidence, the specific change you made, and the expected effect. Do not invent a reproducer, command line, crash, or user-visible failure that is not present in the evidence bundle. If the evidence is direct-but-not-reproduced, say it was observed by Fixer and not independently reproduced. If the evidence is indirect and you did not gather stronger evidence, do not leave a source diff; write a no-patch diagnosis/report instead. Include an explicit effect sentence such as `The expected effect is ...`, `This should reduce ...`, or `This prevents ...` for source patches. If the logic is non-obvious in code, mention that you added a short explanatory comment.
## Git Add Paths
List the repo-relative paths that belong in the final patch, one per line. Use `None` only when you intentionally made no source changes. Include intentionally new files, and do not list generated build artifacts.
## Validation
List the checks you ran, or say clearly that you could not run them. Include the independent reproduction command/test and result when `## Evidence Confidence` is `reproduced`; if reproduction was attempted but blocked, name the exact blocker and keep confidence at `observed` or `inferred`.
Before editing, read the plan at `./plan-output.txt` and follow it unless the code proves part of it wrong. If you change course, say so explicitly in the final write-up instead of silently drifting from the plan.
## Review Pass 1
You are reviewing a freshly generated fixer patch.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Review the first patch pass. The original pre-edit snapshot is available at `./source` for diffing.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout. The latest author response is at `./patch-output.txt`. Inspect the current code and changed paths like a strict code reviewer. Focus on correctness, regressions, maintainability, awkward control flow such as avoidable `goto`, missing validation, weak or non-gittable commit message text, and explanations that fail to connect the observed issue evidence to the code change. Also review the maintainer experience: the patch mail should be easy to accept upstream, the user-visible bug should be explained in plain language, subsystem-specific jargon should be defined when first used, and any non-obvious state translation or index remapping in code should have a short explanatory comment. Reject patches that omit `## Evidence Confidence`, use anything other than `reproduced`, `observed`, or `inferred`, or sound more certain than that evidence level allows. Reject patches that claim `reproduced` unless `## Validation` names the concrete reproduction command or test and its result. Reject source patches in security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior unless the author reproduced the behavior and explicitly analyzed the security impact of the change; observed-only evidence should become a diagnosis/report, not a PR-ready source diff. Reject patches that invent a reproducer, command line, crash, or user-visible failure not present in the evidence bundle; indirect profiler or strace evidence may justify a cautious mitigation, but the author must say it is indirect instead of presenting it as a confirmed upstream bug. Reject patches that introduce generic libc/std APIs when nearby code or project docs provide a local compat/helper API for the same job, unless the author explicitly justifies the exception. Reject validation that only reports a leaf object/syntax build when a project-level configure/build/test entrypoint exists and was not attempted; if a full build cannot run, the author must show the exact failed command and blocker.
Do not apply code changes in this pass.
Return a short markdown review report. The first non-empty line must be exactly one of:
RESULT: ok
RESULT: fix-needed
If you choose `RESULT: fix-needed`, add a `## Findings` section with concrete, actionable items.## Plan Pass
## Problem
Fixer observed `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` in repeated `pselect6` calls and classified it as a likely busy poll loop. The retained evidence shows the process was sleeping, had only about `0.9%` CPU, and the syscall timeouts were about `1.8-2.0s`, with no Perl-level stack tying the wait to munin-node logic.
## Evidence Confidence
inferred
## Proposed Subject
No source patch yet: report this as likely normal `Net::Server::Fork` idle accept-loop behavior, not a confirmed munin-node runaway bug.
## Patch Plan
Do not edit munin in this pass. `lib/Munin/Node/Server.pm` subclasses `Net::Server::Fork`; the installed `Net::Server::Fork` forces `multi_port` mode and uses `IO::Select->can_read(2)`, matching the observed repeated two-second `pselect6` cadence.
Before any future source patch, collect stronger evidence: a Perl-level stack or trace during high CPU, a successful `strace` showing non-blocking/near-zero poll returns, and the active munin-node config/listen sockets. Without that, a source change would be speculative and not pull-request-ready.
Upstream conventions found: `CONTRIBUTING.md` points to `HACKING.pod`; new Perl code should use `strict`, `warnings`, taint-mode compatibility, `English qw(-no_match_vars)`, and existing helpers such as `Munin::Common::Daemon::emit_sd_notify_message` and `Munin::Common::Timeout::do_with_timeout` where relevant. No relevant munin wrapper for the Net::Server accept wait was found. No prior Fixer patch was present to improve or replace. If a future patch is justified, keep it bounded and avoid awkward control flow such as avoidable `goto`.
## Risks
Patching munin-node based only on this evidence could replace normal idle server behavior with a worse accept loop, alter daemon readiness/listening semantics, or mask a workload-specific issue elsewhere. This is not security-sensitive as scoped; it does not touch auth, permissions, crypto, sandboxing, credentials, or timing/throttling policy.
## Validation
Tried project-level entrypoints from the workspace root:
`make` failed because `Module::Build.pm` is missing at `Build.PL line 80`.
`make check` failed because there is no `check` target.
Focused check:
`perl -T -Ilib -c script/munin-node` passed with `script/munin-node syntax OK`.
Bounded independent reproduction attempt:
`strace ... munin-node --foreground` could not run because ptrace is blocked: `PTRACE_TRACEME: Operation not permitted`.
A foreground startup smoke check also could not bind a localhost test port in this sandbox: `Cannot bind and listen ... [Operation not permitted]`.
## Patch Pass
Subject: Diagnose munin-node idle select trace
## Commit Message
No source change was made. The collected signal points to munin-node idling in the `Net::Server::Fork` accept loop, not to a confirmed runaway loop in munin or Perl.
Fixer saw repeated `pselect6` calls, but `/proc` showed the process sleeping with about `0.9%` CPU and syscall waits around two seconds. `Net::Server::Fork` uses `IO::Select->can_read(2)` while waiting for client connections, which matches that cadence.
## Evidence Confidence
inferred
## Issue Connection
The collected signal was `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` repeatedly entering `pselect6`; the process was in `S (sleeping)` state, `wchan` was `poll_schedule_timeout.constprop.0`, and the retained strace excerpt showed timeouts of about `1.8-2.0` seconds.
The cautious code-level inference is that this is normal idle listener behavior. `script/munin-node` initializes `Munin::Node::Server`, and `Munin::Node::Server` subclasses `Net::Server::Fork`. The installed `Net::Server::Fork` accept path blocks in `IO::Select->can_read(2)`, so the two-second poll-family syscall cadence is explained without a munin source bug. I also checked the Perl runtime version path; the evidence does not show Perl mishandling this workload.
No source change was made because the evidence is profiler/trace-based and does not include a Perl-level stack, near-zero-time poll loop, high local CPU reproduction, or other stronger evidence tying a bug to munin code. This follows the saved plan rather than drifting into a speculative patch. The expected effect is a maintainer-ready diagnosis and a clear request for stronger runtime evidence before any upstream source change.
## Git Add Paths
None
## Validation
Project-level entrypoints from the workspace root:
`make` failed because `Module::Build.pm` is missing at `Build.PL line 80`.
`make check` failed because there is no `check` target.
Focused check:
`perl -T -Ilib -c script/munin-node` passed: `script/munin-node syntax OK`.
Bounded independent reproduction attempts:
`strace -ttT -f -e trace=pselect6,select,poll,ppoll,epoll_wait,nanosleep,clock_nanosleep ... munin-node --foreground ...` was blocked by ptrace restrictions: `PTRACE_TRACEME: Operation not permitted`.
A plain foreground startup smoke command was blocked by sandbox networking: `Cannot bind and listen to TCP port 34952 on 127.0.0.1 [Operation not permitted]`.
Style/helper scan: `CONTRIBUTING.md` and `HACKING.pod` require taint-compatible Perl with `strict`, `warnings`, and local style. Relevant existing helpers include `Munin::Common::Daemon::emit_sd_notify_message` and `Munin::Common::Timeout::do_with_timeout`; no relevant munin wrapper for the `Net::Server::Fork` accept wait was found. `git status --short` is clean.
## Review Pass 1
RESULT: ok
No source diff is present (`git status --short` clean), so this is correctly handled as a no-patch diagnosis/report.
The author response includes required sections, uses valid `## Evidence Confidence` value `inferred`, lists `None` under `## Git Add Paths`, and does not claim reproduction. The explanation is appropriately cautious for profiler/trace evidence: `/proc` shows the process sleeping, the strace excerpt shows ~2s `pselect6` timeouts, and local code inspection supports the `Net::Server::Fork` accept-loop inference via `IO::Select->can_read(2)`.
Validation reporting is acceptable: project-level `make` and `make check` were attempted with exact blockers, a focused taint-mode syntax check was run, and reproduction attempts report concrete sandbox blockers. Style/helper expectations were also addressed with `CONTRIBUTING.md`, `HACKING.pod`, `Munin::Common::Daemon::emit_sd_notify_message`, and `Munin::Common::Timeout::do_with_timeout`.perl likely remains stuck in a busy-poll loop. A diagnosis report and patch proposal were created locally.
## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.
## Patch Pass
You are working on a bounded fixer proposal.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Produce the smallest reasonable patch for the target repository, keep the change upstreamable, prefer the clearest control flow available, and do not keep avoidable `goto` when a simpler structure would read better. Before introducing new file, process, allocation, locking, networking, or platform APIs, inspect nearby code and project contribution docs for existing helpers or compatibility wrappers and use those local patterns unless you can explain why they do not fit. Validate from a reproducible workspace-root entrypoint before falling back to focused leaf commands; if a build or test cannot run, report the exact command, the exact blocker, and any narrower check you ran instead. During validation, also try one bounded independent reproduction of the collected failure signal when it is safe and cheap, such as a failing test, smoke command, perf/strace comparison, or before/after runtime check. Only use `reproduced` if that command or test actually reproduced the failure; otherwise keep `observed` and report the reproduction blocker. The final explanation must connect the observed issue evidence to the actual code change, not just paraphrase the diff. Write like a maintainer is going to read the patch mail cold: explain the bug in plain language, define subsystem-specific jargon the first time you need it, and make the causal story obvious. Explicitly classify evidence confidence as `reproduced`, `observed`, or `inferred`: `reproduced` means you reproduced the failure locally; `observed` means Fixer has direct crash/log/trace evidence but you did not independently reproduce it; `inferred` means the source patch is not pull-request-ready, so do not leave a source diff unless you first gather stronger observed/reproduced evidence; otherwise return a no-patch diagnosis/report. For any source-changing `observed` patch, say explicitly in `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. Security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior need reproduced evidence plus explicit security-impact analysis before leaving a source diff; otherwise return a no-patch diagnosis/report for human review. If you introduce non-obvious state translation, index remapping, or backend split logic, add a short source comment that explains the invariant being preserved.
Start by explaining the likely root cause from the collected perf, strace, and /proc evidence. If you cannot land a safe patch, leave a diagnosis that is strong enough for an upstream bug report.
Interpreter process expectation: when the hot process is Python, Perl, shell, Node, Ruby, PHP, Lua, or another interpreter, inspect both the runtime and the script/application entrypoint from `details.interpreter_process`. Prefer the script or application package when evidence points there; do not patch the interpreter runtime merely because the hot binary is `python`, `perl`, `bash`, or similar. Runtime fixes are welcome only after checking the entrypoint and explaining why the runtime mishandles the workload or why running bad code faster/safer is itself the right upstream fix.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Keep the change narrowly scoped and summarize validation clearly.
In every authoring pass, your final response must start with `Subject: <single-line git commit subject>` and then include these markdown sections exactly:
## Commit Message
A short upstream-friendly explanation of what changed and why. Write it in plain language that a maintainer can follow without local complaint context. If you use subsystem jargon, define it immediately.
## Evidence Confidence
Exactly one word: `reproduced`, `observed`, or `inferred`. Use `reproduced` only when you reproduced the failure locally with a command or test, and include that command/test in `## Validation`. Use `observed` when Fixer has direct crash/log/trace evidence but you did not independently reproduce it. If `## Git Add Paths` lists source files for an `observed` patch, `## Issue Connection` must explicitly say the failure was observed by Fixer and not independently reproduced. Security-sensitive source changes touching authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior require reproduced evidence and explicit security-impact analysis; otherwise list `None` under `## Git Add Paths` and write a no-patch diagnosis/report. Use `inferred` for profiler/strace/indirect evidence; inferred responses may be no-patch diagnoses or reports, but inferred source patches are not pull-request-ready until stronger evidence is gathered.
## Issue Connection
Write this as maintainer-facing patch mail, not as local Fixer notes. Cover four things explicitly in readable sentences: the user-visible symptom or the exact collected signal, the code-level cause or the cautious inference from evidence, the specific change you made, and the expected effect. Do not invent a reproducer, command line, crash, or user-visible failure that is not present in the evidence bundle. If the evidence is direct-but-not-reproduced, say it was observed by Fixer and not independently reproduced. If the evidence is indirect and you did not gather stronger evidence, do not leave a source diff; write a no-patch diagnosis/report instead. Include an explicit effect sentence such as `The expected effect is ...`, `This should reduce ...`, or `This prevents ...` for source patches. If the logic is non-obvious in code, mention that you added a short explanatory comment.
## Git Add Paths
List the repo-relative paths that belong in the final patch, one per line. Use `None` only when you intentionally made no source changes. Include intentionally new files, and do not list generated build artifacts.
## Validation
List the checks you ran, or say clearly that you could not run them. Include the independent reproduction command/test and result when `## Evidence Confidence` is `reproduced`; if reproduction was attempted but blocked, name the exact blocker and keep confidence at `observed` or `inferred`.
Before editing, read the plan at `./plan-output.txt` and follow it unless the code proves part of it wrong. If you change course, say so explicitly in the final write-up instead of silently drifting from the plan.
## Review Pass 1
You are reviewing a freshly generated fixer patch.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Review the first patch pass. The original pre-edit snapshot is available at `./source` for diffing.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout. The latest author response is at `./patch-output.txt`. Inspect the current code and changed paths like a strict code reviewer. Focus on correctness, regressions, maintainability, awkward control flow such as avoidable `goto`, missing validation, weak or non-gittable commit message text, and explanations that fail to connect the observed issue evidence to the code change. Also review the maintainer experience: the patch mail should be easy to accept upstream, the user-visible bug should be explained in plain language, subsystem-specific jargon should be defined when first used, and any non-obvious state translation or index remapping in code should have a short explanatory comment. Reject patches that omit `## Evidence Confidence`, use anything other than `reproduced`, `observed`, or `inferred`, or sound more certain than that evidence level allows. Reject patches that claim `reproduced` unless `## Validation` names the concrete reproduction command or test and its result. Reject source patches in security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior unless the author reproduced the behavior and explicitly analyzed the security impact of the change; observed-only evidence should become a diagnosis/report, not a PR-ready source diff. Reject patches that invent a reproducer, command line, crash, or user-visible failure not present in the evidence bundle; indirect profiler or strace evidence may justify a cautious mitigation, but the author must say it is indirect instead of presenting it as a confirmed upstream bug. Reject patches that introduce generic libc/std APIs when nearby code or project docs provide a local compat/helper API for the same job, unless the author explicitly justifies the exception. Reject validation that only reports a leaf object/syntax build when a project-level configure/build/test entrypoint exists and was not attempted; if a full build cannot run, the author must show the exact failed command and blocker.
Do not apply code changes in this pass.
Return a short markdown review report. The first non-empty line must be exactly one of:
RESULT: ok
RESULT: fix-needed
If you choose `RESULT: fix-needed`, add a `## Findings` section with concrete, actionable items.## Plan Pass
## Problem
Fixer observed `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` in repeated `pselect6` calls and classified it as a likely busy poll loop. The retained evidence shows the process was sleeping, had only about `0.9%` CPU, and the syscall timeouts were about `1.8-2.0s`, with no Perl-level stack tying the wait to munin-node logic.
## Evidence Confidence
inferred
## Proposed Subject
No source patch yet: report this as likely normal `Net::Server::Fork` idle accept-loop behavior, not a confirmed munin-node runaway bug.
## Patch Plan
Do not edit munin in this pass. `lib/Munin/Node/Server.pm` subclasses `Net::Server::Fork`; the installed `Net::Server::Fork` forces `multi_port` mode and uses `IO::Select->can_read(2)`, matching the observed repeated two-second `pselect6` cadence.
Before any future source patch, collect stronger evidence: a Perl-level stack or trace during high CPU, a successful `strace` showing non-blocking/near-zero poll returns, and the active munin-node config/listen sockets. Without that, a source change would be speculative and not pull-request-ready.
Upstream conventions found: `CONTRIBUTING.md` points to `HACKING.pod`; new Perl code should use `strict`, `warnings`, taint-mode compatibility, `English qw(-no_match_vars)`, and existing helpers such as `Munin::Common::Daemon::emit_sd_notify_message` and `Munin::Common::Timeout::do_with_timeout` where relevant. No relevant munin wrapper for the Net::Server accept wait was found. No prior Fixer patch was present to improve or replace. If a future patch is justified, keep it bounded and avoid awkward control flow such as avoidable `goto`.
## Risks
Patching munin-node based only on this evidence could replace normal idle server behavior with a worse accept loop, alter daemon readiness/listening semantics, or mask a workload-specific issue elsewhere. This is not security-sensitive as scoped; it does not touch auth, permissions, crypto, sandboxing, credentials, or timing/throttling policy.
## Validation
Tried project-level entrypoints from the workspace root:
`make` failed because `Module::Build.pm` is missing at `Build.PL line 80`.
`make check` failed because there is no `check` target.
Focused check:
`perl -T -Ilib -c script/munin-node` passed with `script/munin-node syntax OK`.
Bounded independent reproduction attempt:
`strace ... munin-node --foreground` could not run because ptrace is blocked: `PTRACE_TRACEME: Operation not permitted`.
A foreground startup smoke check also could not bind a localhost test port in this sandbox: `Cannot bind and listen ... [Operation not permitted]`.
## Patch Pass
Subject: Diagnose munin-node idle select trace
## Commit Message
No source change was made. The collected signal points to munin-node idling in the `Net::Server::Fork` accept loop, not to a confirmed runaway loop in munin or Perl.
Fixer saw repeated `pselect6` calls, but `/proc` showed the process sleeping with about `0.9%` CPU and syscall waits around two seconds. `Net::Server::Fork` uses `IO::Select->can_read(2)` while waiting for client connections, which matches that cadence.
## Evidence Confidence
inferred
## Issue Connection
The collected signal was `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` repeatedly entering `pselect6`; the process was in `S (sleeping)` state, `wchan` was `poll_schedule_timeout.constprop.0`, and the retained strace excerpt showed timeouts of about `1.8-2.0` seconds.
The cautious code-level inference is that this is normal idle listener behavior. `script/munin-node` initializes `Munin::Node::Server`, and `Munin::Node::Server` subclasses `Net::Server::Fork`. The installed `Net::Server::Fork` accept path blocks in `IO::Select->can_read(2)`, so the two-second poll-family syscall cadence is explained without a munin source bug. I also checked the Perl runtime version path; the evidence does not show Perl mishandling this workload.
No source change was made because the evidence is profiler/trace-based and does not include a Perl-level stack, near-zero-time poll loop, high local CPU reproduction, or other stronger evidence tying a bug to munin code. This follows the saved plan rather than drifting into a speculative patch. The expected effect is a maintainer-ready diagnosis and a clear request for stronger runtime evidence before any upstream source change.
## Git Add Paths
None
## Validation
Project-level entrypoints from the workspace root:
`make` failed because `Module::Build.pm` is missing at `Build.PL line 80`.
`make check` failed because there is no `check` target.
Focused check:
`perl -T -Ilib -c script/munin-node` passed: `script/munin-node syntax OK`.
Bounded independent reproduction attempts:
`strace -ttT -f -e trace=pselect6,select,poll,ppoll,epoll_wait,nanosleep,clock_nanosleep ... munin-node --foreground ...` was blocked by ptrace restrictions: `PTRACE_TRACEME: Operation not permitted`.
A plain foreground startup smoke command was blocked by sandbox networking: `Cannot bind and listen to TCP port 34952 on 127.0.0.1 [Operation not permitted]`.
Style/helper scan: `CONTRIBUTING.md` and `HACKING.pod` require taint-compatible Perl with `strict`, `warnings`, and local style. Relevant existing helpers include `Munin::Common::Daemon::emit_sd_notify_message` and `Munin::Common::Timeout::do_with_timeout`; no relevant munin wrapper for the `Net::Server::Fork` accept wait was found. `git status --short` is clean.
## Review Pass 1
RESULT: ok
No source diff is present (`git status --short` clean), so this is correctly handled as a no-patch diagnosis/report.
The author response includes required sections, uses valid `## Evidence Confidence` value `inferred`, lists `None` under `## Git Add Paths`, and does not claim reproduction. The explanation is appropriately cautious for profiler/trace evidence: `/proc` shows the process sleeping, the strace excerpt shows ~2s `pselect6` timeouts, and local code inspection supports the `Net::Server::Fork` accept-loop inference via `IO::Select->can_read(2)`.
Validation reporting is acceptable: project-level `make` and `make check` were attempted with exact blockers, a focused taint-mode syntax check was run, and reproduction attempts report concrete sandbox blockers. Style/helper expectations were also addressed with `CONTRIBUTING.md`, `HACKING.pod`, `Munin::Common::Daemon::emit_sd_notify_message`, and `Munin::Common::Timeout::do_with_timeout`.perl likely remains stuck in a busy-poll loop. The diagnosis was captured, but the patch proposal did not complete cleanly.
timeout
Codex stage timed out after 900 second(s)./usr/bin/perl -wT /usr/sbin/munin-node --foregroundThe trace repeatedly returns to a poll-family syscall without meaningful blocking, which suggests a busy event-loop wakeup.
Thread 1 (Thread 0x7f82eb914b80 (LWP 3947104) "munin-node"):
#0 0x00007f82eb9e87d2 in ?? () from target:<path>
#1 0x00007f82eb9e87ed in ?? () from target:<path>
#2 0x00007f82eba686cf in select () from target:<path>
#3 0x000055b5551b8ee4 in ?? ()
#4 0x000055b55521a496 in Perl_runops_standard ()
#5 0x000055b555100b85 in perl_run ()
#6 0x000055b5550d35ae in main ()## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.## Plan Pass
## Workflow Note
Codex stage timed out after 900 second(s).perl likely remains stuck in a busy-poll loop. The diagnosis was captured, but the patch proposal did not complete cleanly.
timeout
Codex stage timed out after 900 second(s)./usr/bin/perl -wT /usr/sbin/munin-node --foregroundThe trace repeatedly returns to a poll-family syscall without meaningful blocking, which suggests a busy event-loop wakeup.
Thread 1 (Thread 0x7f82eb914b80 (LWP 3947104) "munin-node"):
#0 0x00007f82eb9e87d2 in ?? () from target:<path>
#1 0x00007f82eb9e87ed in ?? () from target:<path>
#2 0x00007f82eba686cf in select () from target:<path>
#3 0x000055b5551b8ee4 in ?? ()
#4 0x000055b55521a496 in Perl_runops_standard ()
#5 0x000055b555100b85 in perl_run ()
#6 0x000055b5550d35ae in main ()## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.## Plan Pass
## Workflow Note
Codex stage timed out after 900 second(s).perl likely remains stuck in a busy-poll loop. A diagnosis report and patch proposal were created locally.
## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.
## Patch Pass
You are working on a bounded fixer proposal.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Produce the smallest reasonable patch for the target repository, keep the change upstreamable, prefer the clearest control flow available, and do not keep avoidable `goto` when a simpler structure would read better. Before introducing new file, process, allocation, locking, networking, or platform APIs, inspect nearby code and project contribution docs for existing helpers or compatibility wrappers and use those local patterns unless you can explain why they do not fit. Validate from a reproducible workspace-root entrypoint before falling back to focused leaf commands; if a build or test cannot run, report the exact command, the exact blocker, and any narrower check you ran instead. During validation, also try one bounded independent reproduction of the collected failure signal when it is safe and cheap, such as a failing test, smoke command, perf/strace comparison, or before/after runtime check. Only use `reproduced` if that command or test actually reproduced the failure; otherwise keep `observed` and report the reproduction blocker. The final explanation must connect the observed issue evidence to the actual code change, not just paraphrase the diff. Write like a maintainer is going to read the patch mail cold: explain the bug in plain language, define subsystem-specific jargon the first time you need it, and make the causal story obvious. Explicitly classify evidence confidence as `reproduced`, `observed`, or `inferred`: `reproduced` means you reproduced the failure locally; `observed` means Fixer has direct crash/log/trace evidence but you did not independently reproduce it; `inferred` means the source patch is not pull-request-ready, so do not leave a source diff unless you first gather stronger observed/reproduced evidence; otherwise return a no-patch diagnosis/report. For any source-changing `observed` patch, say explicitly in `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. Security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior need reproduced evidence plus explicit security-impact analysis before leaving a source diff; otherwise return a no-patch diagnosis/report for human review. If you introduce non-obvious state translation, index remapping, or backend split logic, add a short source comment that explains the invariant being preserved.
Start by explaining the likely root cause from the collected perf, strace, and /proc evidence. If you cannot land a safe patch, leave a diagnosis that is strong enough for an upstream bug report.
Interpreter process expectation: when the hot process is Python, Perl, shell, Node, Ruby, PHP, Lua, or another interpreter, inspect both the runtime and the script/application entrypoint from `details.interpreter_process`. Prefer the script or application package when evidence points there; do not patch the interpreter runtime merely because the hot binary is `python`, `perl`, `bash`, or similar. Runtime fixes are welcome only after checking the entrypoint and explaining why the runtime mishandles the workload or why running bad code faster/safer is itself the right upstream fix.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Keep the change narrowly scoped and summarize validation clearly.
In every authoring pass, your final response must start with `Subject: <single-line git commit subject>` and then include these markdown sections exactly:
## Commit Message
A short upstream-friendly explanation of what changed and why. Write it in plain language that a maintainer can follow without local complaint context. If you use subsystem jargon, define it immediately.
## Evidence Confidence
Exactly one word: `reproduced`, `observed`, or `inferred`. Use `reproduced` only when you reproduced the failure locally with a command or test, and include that command/test in `## Validation`. Use `observed` when Fixer has direct crash/log/trace evidence but you did not independently reproduce it. If `## Git Add Paths` lists source files for an `observed` patch, `## Issue Connection` must explicitly say the failure was observed by Fixer and not independently reproduced. Security-sensitive source changes touching authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior require reproduced evidence and explicit security-impact analysis; otherwise list `None` under `## Git Add Paths` and write a no-patch diagnosis/report. Use `inferred` for profiler/strace/indirect evidence; inferred responses may be no-patch diagnoses or reports, but inferred source patches are not pull-request-ready until stronger evidence is gathered.
## Issue Connection
Write this as maintainer-facing patch mail, not as local Fixer notes. Cover four things explicitly in readable sentences: the user-visible symptom or the exact collected signal, the code-level cause or the cautious inference from evidence, the specific change you made, and the expected effect. Do not invent a reproducer, command line, crash, or user-visible failure that is not present in the evidence bundle. If the evidence is direct-but-not-reproduced, say it was observed by Fixer and not independently reproduced. If the evidence is indirect and you did not gather stronger evidence, do not leave a source diff; write a no-patch diagnosis/report instead. Include an explicit effect sentence such as `The expected effect is ...`, `This should reduce ...`, or `This prevents ...` for source patches. If the logic is non-obvious in code, mention that you added a short explanatory comment.
## Git Add Paths
List the repo-relative paths that belong in the final patch, one per line. Use `None` only when you intentionally made no source changes. Include intentionally new files, and do not list generated build artifacts.
## Validation
List the checks you ran, or say clearly that you could not run them. Include the independent reproduction command/test and result when `## Evidence Confidence` is `reproduced`; if reproduction was attempted but blocked, name the exact blocker and keep confidence at `observed` or `inferred`.
Before editing, read the plan at `./plan-output.txt` and follow it unless the code proves part of it wrong. If you change course, say so explicitly in the final write-up instead of silently drifting from the plan.
## Review Pass 1
You are reviewing a freshly generated fixer patch.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Review the first patch pass. The original pre-edit snapshot is available at `./source` for diffing.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout. The latest author response is at `./patch-output.txt`. Inspect the current code and changed paths like a strict code reviewer. Focus on correctness, regressions, maintainability, awkward control flow such as avoidable `goto`, missing validation, weak or non-gittable commit message text, and explanations that fail to connect the observed issue evidence to the code change. Also review the maintainer experience: the patch mail should be easy to accept upstream, the user-visible bug should be explained in plain language, subsystem-specific jargon should be defined when first used, and any non-obvious state translation or index remapping in code should have a short explanatory comment. Reject patches that omit `## Evidence Confidence`, use anything other than `reproduced`, `observed`, or `inferred`, or sound more certain than that evidence level allows. Reject patches that claim `reproduced` unless `## Validation` names the concrete reproduction command or test and its result. Reject source patches in security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior unless the author reproduced the behavior and explicitly analyzed the security impact of the change; observed-only evidence should become a diagnosis/report, not a PR-ready source diff. Reject patches that invent a reproducer, command line, crash, or user-visible failure not present in the evidence bundle; indirect profiler or strace evidence may justify a cautious mitigation, but the author must say it is indirect instead of presenting it as a confirmed upstream bug. Reject patches that introduce generic libc/std APIs when nearby code or project docs provide a local compat/helper API for the same job, unless the author explicitly justifies the exception. Reject validation that only reports a leaf object/syntax build when a project-level configure/build/test entrypoint exists and was not attempted; if a full build cannot run, the author must show the exact failed command and blocker.
Do not apply code changes in this pass.
Return a short markdown review report. The first non-empty line must be exactly one of:
RESULT: ok
RESULT: fix-needed
If you choose `RESULT: fix-needed`, add a `## Findings` section with concrete, actionable items.## Plan Pass
## Problem
Fixer observed `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` in repeated `pselect6` calls, but the retained evidence shows `pselect6(..., {tv_sec=2,...})` blocking for about 1.8-2.0 seconds, process state `S (sleeping)`, and only 0.9% CPU. In the workspace, `script/munin-node` delegates the daemon accept loop to `Munin::Node::Server`, which subclasses `Net::Server::Fork`; that runtime’s `accept()` calls `$prop->{select}->can_read(2)`, matching the observed two-second `pselect6` timeout. This looks like normal idle listener behavior, not a proven runaway Munin loop.
## Evidence Confidence
observed
## Proposed Subject
No source patch yet: diagnose the Fixer signal as non-actionable for Munin unless an independent reproduction shows a true tight poll loop or CPU burn.
## Patch Plan
- Do not edit Munin based only on this bundle; the evidence does not tie the profiler signal to a Munin source-level bug.
- Document that `Net::Server::Fork`’s two-second `can_read(2)` wait explains the observed syscall cadence.
- If later evidence proves a real loop, start at `lib/Munin/Node/Server.pm` and `script/munin-node`, preserving Munin conventions from `CONTRIBUTING.md`/`HACKING.pod`: `use strict`, `use warnings`, taint-mode compatibility, `English qw(-no_match_vars)`, existing logging via `Munin::Common::Logger`, timeout handling via `Munin::Common::Timeout`, and daemon readiness via `Munin::Common::Daemon`.
- No prior Fixer patch was present in this workspace; Debian quilt patches are unrelated.
- Avoid awkward control flow such as introducing `goto`; any future fix should be a bounded local change around the listener/session handling.
## Risks
A source patch here would likely change normal `Net::Server::Fork` idle behavior without evidence of harm. Changing accept-loop timing can affect signal handling, shutdown responsiveness, fork behavior, and daemon availability. This is not security-sensitive as currently scoped.
## Validation
- First try project-level entrypoints from the workspace root: `make`, then `make check` if available.
- If project-level validation fails from missing dependencies or generated files, record the exact failure and then run focused checks such as `perl -c -Ilib script/munin-node` and `perl -c -Ilib lib/Munin/Node/Server.pm`.
- Bounded independent reproduction before any source patch: run `munin-node` in foreground with a temporary config and trace `pselect6/select/poll` for a few seconds while idle. A reproduced bug would need to show near-zero-timeout polling or meaningful CPU burn; repeated blocking two-second `pselect6` calls alone should not be claimed as reproduced failure.
## Patch Pass
Subject: Diagnose munin-node idle accept wait
## Commit Message
No source change is proposed. The collected perf and strace data points at an idle `munin-node` parent process waiting in `select`, not at a tight Munin application loop. `munin-node` uses `Net::Server::Fork` for its accept loop; that module waits up to two seconds for readable listener sockets, matching the observed `pselect6` timeouts.
## Evidence Confidence
inferred
## Issue Connection
Fixer collected a native backtrace and strace for `/usr/bin/perl -wT /usr/sbin/munin-node --foreground`, with repeated `pselect6` calls. The same evidence shows the process was sleeping, used about 0.9% CPU, and the `pselect6` calls blocked for roughly two seconds.
The likely code-level cause is `Net::Server::Fork`’s idle accept loop, not Perl or Munin request processing. `Munin::Node::Server` subclasses `Net::Server::Fork`, whose `accept()` implementation calls `can_read(2)`. That explains the two-second `pselect6(... Timeout)` cadence in the trace.
I followed the saved plan and did not change course: there is no safe upstream source patch here because the available evidence does not prove a Munin bug. The expected effect of this no-patch diagnosis is to avoid changing normal listener timing behavior based on an indirect profiler classification.
I checked `CONTRIBUTING.md` and `HACKING.pod`; relevant local conventions are taint-compatible Perl with `strict`/`warnings`, `English qw(-no_match_vars)`, logging through `Munin::Common::Logger`, timeouts through `Munin::Common::Timeout`, and daemon readiness through `Munin::Common::Daemon`. No relevant local helper fits changing the external `Net::Server::Fork` idle accept wait.
## Git Add Paths
None
## Validation
`make` from the workspace root failed before build: `Can't locate Module/Build.pm in @INC ... at Build.PL line 80`; `make: *** [Makefile:149: Build] Error 2`.
`make check` failed because the target does not exist: `make: *** No rule to make target 'check'. Stop.`
Focused checks:
`perl -T -c -Ilib script/munin-node` passed.
`perl -c -Ilib lib/Munin/Node/Server.pm` passed.
Bounded reproduction attempt:
`strace -ttT -e trace=pselect6,select,poll ...` was blocked by sandbox ptrace restrictions: `PTRACE_TRACEME: Operation not permitted` and `ptrace(PTRACE_SEIZE, 5): Operation not permitted`.
Fallback smoke check:
`perl -MTime::HiRes=time -MIO::Select -e 'pipe(...); ... can_read(2) ...'` reported `elapsed=4.004` for two waits, supporting that two-second `select` timeouts are blocking waits, not a reproduced busy loop.
## Review Pass 1
RESULT: ok
No source patch was left in the workspace, and `## Git Add Paths` correctly lists `None`. The author followed the saved plan, kept the confidence at `inferred`, did not invent a reproduced failure, and explained why the observed two-second `pselect6` cadence matches `Net::Server::Fork` idle accept behavior rather than a proven Munin bug.
Validation is acceptable for a no-patch diagnosis: project-level `make` and `make check` were attempted with exact blockers, focused Perl syntax checks were run, and the attempted independent strace reproduction reported the sandbox ptrace blocker.perl likely remains stuck in a busy-poll loop. A diagnosis report and patch proposal were created locally.
## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.
## Patch Pass
You are working on a bounded fixer proposal.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Produce the smallest reasonable patch for the target repository, keep the change upstreamable, prefer the clearest control flow available, and do not keep avoidable `goto` when a simpler structure would read better. Before introducing new file, process, allocation, locking, networking, or platform APIs, inspect nearby code and project contribution docs for existing helpers or compatibility wrappers and use those local patterns unless you can explain why they do not fit. Validate from a reproducible workspace-root entrypoint before falling back to focused leaf commands; if a build or test cannot run, report the exact command, the exact blocker, and any narrower check you ran instead. During validation, also try one bounded independent reproduction of the collected failure signal when it is safe and cheap, such as a failing test, smoke command, perf/strace comparison, or before/after runtime check. Only use `reproduced` if that command or test actually reproduced the failure; otherwise keep `observed` and report the reproduction blocker. The final explanation must connect the observed issue evidence to the actual code change, not just paraphrase the diff. Write like a maintainer is going to read the patch mail cold: explain the bug in plain language, define subsystem-specific jargon the first time you need it, and make the causal story obvious. Explicitly classify evidence confidence as `reproduced`, `observed`, or `inferred`: `reproduced` means you reproduced the failure locally; `observed` means Fixer has direct crash/log/trace evidence but you did not independently reproduce it; `inferred` means the source patch is not pull-request-ready, so do not leave a source diff unless you first gather stronger observed/reproduced evidence; otherwise return a no-patch diagnosis/report. For any source-changing `observed` patch, say explicitly in `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. Security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior need reproduced evidence plus explicit security-impact analysis before leaving a source diff; otherwise return a no-patch diagnosis/report for human review. If you introduce non-obvious state translation, index remapping, or backend split logic, add a short source comment that explains the invariant being preserved.
Start by explaining the likely root cause from the collected perf, strace, and /proc evidence. If you cannot land a safe patch, leave a diagnosis that is strong enough for an upstream bug report.
Interpreter process expectation: when the hot process is Python, Perl, shell, Node, Ruby, PHP, Lua, or another interpreter, inspect both the runtime and the script/application entrypoint from `details.interpreter_process`. Prefer the script or application package when evidence points there; do not patch the interpreter runtime merely because the hot binary is `python`, `perl`, `bash`, or similar. Runtime fixes are welcome only after checking the entrypoint and explaining why the runtime mishandles the workload or why running bad code faster/safer is itself the right upstream fix.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Keep the change narrowly scoped and summarize validation clearly.
In every authoring pass, your final response must start with `Subject: <single-line git commit subject>` and then include these markdown sections exactly:
## Commit Message
A short upstream-friendly explanation of what changed and why. Write it in plain language that a maintainer can follow without local complaint context. If you use subsystem jargon, define it immediately.
## Evidence Confidence
Exactly one word: `reproduced`, `observed`, or `inferred`. Use `reproduced` only when you reproduced the failure locally with a command or test, and include that command/test in `## Validation`. Use `observed` when Fixer has direct crash/log/trace evidence but you did not independently reproduce it. If `## Git Add Paths` lists source files for an `observed` patch, `## Issue Connection` must explicitly say the failure was observed by Fixer and not independently reproduced. Security-sensitive source changes touching authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior require reproduced evidence and explicit security-impact analysis; otherwise list `None` under `## Git Add Paths` and write a no-patch diagnosis/report. Use `inferred` for profiler/strace/indirect evidence; inferred responses may be no-patch diagnoses or reports, but inferred source patches are not pull-request-ready until stronger evidence is gathered.
## Issue Connection
Write this as maintainer-facing patch mail, not as local Fixer notes. Cover four things explicitly in readable sentences: the user-visible symptom or the exact collected signal, the code-level cause or the cautious inference from evidence, the specific change you made, and the expected effect. Do not invent a reproducer, command line, crash, or user-visible failure that is not present in the evidence bundle. If the evidence is direct-but-not-reproduced, say it was observed by Fixer and not independently reproduced. If the evidence is indirect and you did not gather stronger evidence, do not leave a source diff; write a no-patch diagnosis/report instead. Include an explicit effect sentence such as `The expected effect is ...`, `This should reduce ...`, or `This prevents ...` for source patches. If the logic is non-obvious in code, mention that you added a short explanatory comment.
## Git Add Paths
List the repo-relative paths that belong in the final patch, one per line. Use `None` only when you intentionally made no source changes. Include intentionally new files, and do not list generated build artifacts.
## Validation
List the checks you ran, or say clearly that you could not run them. Include the independent reproduction command/test and result when `## Evidence Confidence` is `reproduced`; if reproduction was attempted but blocked, name the exact blocker and keep confidence at `observed` or `inferred`.
Before editing, read the plan at `./plan-output.txt` and follow it unless the code proves part of it wrong. If you change course, say so explicitly in the final write-up instead of silently drifting from the plan.
## Review Pass 1
You are reviewing a freshly generated fixer patch.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Review the first patch pass. The original pre-edit snapshot is available at `./source` for diffing.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout. The latest author response is at `./patch-output.txt`. Inspect the current code and changed paths like a strict code reviewer. Focus on correctness, regressions, maintainability, awkward control flow such as avoidable `goto`, missing validation, weak or non-gittable commit message text, and explanations that fail to connect the observed issue evidence to the code change. Also review the maintainer experience: the patch mail should be easy to accept upstream, the user-visible bug should be explained in plain language, subsystem-specific jargon should be defined when first used, and any non-obvious state translation or index remapping in code should have a short explanatory comment. Reject patches that omit `## Evidence Confidence`, use anything other than `reproduced`, `observed`, or `inferred`, or sound more certain than that evidence level allows. Reject patches that claim `reproduced` unless `## Validation` names the concrete reproduction command or test and its result. Reject source patches in security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior unless the author reproduced the behavior and explicitly analyzed the security impact of the change; observed-only evidence should become a diagnosis/report, not a PR-ready source diff. Reject patches that invent a reproducer, command line, crash, or user-visible failure not present in the evidence bundle; indirect profiler or strace evidence may justify a cautious mitigation, but the author must say it is indirect instead of presenting it as a confirmed upstream bug. Reject patches that introduce generic libc/std APIs when nearby code or project docs provide a local compat/helper API for the same job, unless the author explicitly justifies the exception. Reject validation that only reports a leaf object/syntax build when a project-level configure/build/test entrypoint exists and was not attempted; if a full build cannot run, the author must show the exact failed command and blocker.
Do not apply code changes in this pass.
Return a short markdown review report. The first non-empty line must be exactly one of:
RESULT: ok
RESULT: fix-needed
If you choose `RESULT: fix-needed`, add a `## Findings` section with concrete, actionable items.## Plan Pass
## Problem
Fixer observed `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` in repeated `pselect6` calls, but the retained evidence shows `pselect6(..., {tv_sec=2,...})` blocking for about 1.8-2.0 seconds, process state `S (sleeping)`, and only 0.9% CPU. In the workspace, `script/munin-node` delegates the daemon accept loop to `Munin::Node::Server`, which subclasses `Net::Server::Fork`; that runtime’s `accept()` calls `$prop->{select}->can_read(2)`, matching the observed two-second `pselect6` timeout. This looks like normal idle listener behavior, not a proven runaway Munin loop.
## Evidence Confidence
observed
## Proposed Subject
No source patch yet: diagnose the Fixer signal as non-actionable for Munin unless an independent reproduction shows a true tight poll loop or CPU burn.
## Patch Plan
- Do not edit Munin based only on this bundle; the evidence does not tie the profiler signal to a Munin source-level bug.
- Document that `Net::Server::Fork`’s two-second `can_read(2)` wait explains the observed syscall cadence.
- If later evidence proves a real loop, start at `lib/Munin/Node/Server.pm` and `script/munin-node`, preserving Munin conventions from `CONTRIBUTING.md`/`HACKING.pod`: `use strict`, `use warnings`, taint-mode compatibility, `English qw(-no_match_vars)`, existing logging via `Munin::Common::Logger`, timeout handling via `Munin::Common::Timeout`, and daemon readiness via `Munin::Common::Daemon`.
- No prior Fixer patch was present in this workspace; Debian quilt patches are unrelated.
- Avoid awkward control flow such as introducing `goto`; any future fix should be a bounded local change around the listener/session handling.
## Risks
A source patch here would likely change normal `Net::Server::Fork` idle behavior without evidence of harm. Changing accept-loop timing can affect signal handling, shutdown responsiveness, fork behavior, and daemon availability. This is not security-sensitive as currently scoped.
## Validation
- First try project-level entrypoints from the workspace root: `make`, then `make check` if available.
- If project-level validation fails from missing dependencies or generated files, record the exact failure and then run focused checks such as `perl -c -Ilib script/munin-node` and `perl -c -Ilib lib/Munin/Node/Server.pm`.
- Bounded independent reproduction before any source patch: run `munin-node` in foreground with a temporary config and trace `pselect6/select/poll` for a few seconds while idle. A reproduced bug would need to show near-zero-timeout polling or meaningful CPU burn; repeated blocking two-second `pselect6` calls alone should not be claimed as reproduced failure.
## Patch Pass
Subject: Diagnose munin-node idle accept wait
## Commit Message
No source change is proposed. The collected perf and strace data points at an idle `munin-node` parent process waiting in `select`, not at a tight Munin application loop. `munin-node` uses `Net::Server::Fork` for its accept loop; that module waits up to two seconds for readable listener sockets, matching the observed `pselect6` timeouts.
## Evidence Confidence
inferred
## Issue Connection
Fixer collected a native backtrace and strace for `/usr/bin/perl -wT /usr/sbin/munin-node --foreground`, with repeated `pselect6` calls. The same evidence shows the process was sleeping, used about 0.9% CPU, and the `pselect6` calls blocked for roughly two seconds.
The likely code-level cause is `Net::Server::Fork`’s idle accept loop, not Perl or Munin request processing. `Munin::Node::Server` subclasses `Net::Server::Fork`, whose `accept()` implementation calls `can_read(2)`. That explains the two-second `pselect6(... Timeout)` cadence in the trace.
I followed the saved plan and did not change course: there is no safe upstream source patch here because the available evidence does not prove a Munin bug. The expected effect of this no-patch diagnosis is to avoid changing normal listener timing behavior based on an indirect profiler classification.
I checked `CONTRIBUTING.md` and `HACKING.pod`; relevant local conventions are taint-compatible Perl with `strict`/`warnings`, `English qw(-no_match_vars)`, logging through `Munin::Common::Logger`, timeouts through `Munin::Common::Timeout`, and daemon readiness through `Munin::Common::Daemon`. No relevant local helper fits changing the external `Net::Server::Fork` idle accept wait.
## Git Add Paths
None
## Validation
`make` from the workspace root failed before build: `Can't locate Module/Build.pm in @INC ... at Build.PL line 80`; `make: *** [Makefile:149: Build] Error 2`.
`make check` failed because the target does not exist: `make: *** No rule to make target 'check'. Stop.`
Focused checks:
`perl -T -c -Ilib script/munin-node` passed.
`perl -c -Ilib lib/Munin/Node/Server.pm` passed.
Bounded reproduction attempt:
`strace -ttT -e trace=pselect6,select,poll ...` was blocked by sandbox ptrace restrictions: `PTRACE_TRACEME: Operation not permitted` and `ptrace(PTRACE_SEIZE, 5): Operation not permitted`.
Fallback smoke check:
`perl -MTime::HiRes=time -MIO::Select -e 'pipe(...); ... can_read(2) ...'` reported `elapsed=4.004` for two waits, supporting that two-second `select` timeouts are blocking waits, not a reproduced busy loop.
## Review Pass 1
RESULT: ok
No source patch was left in the workspace, and `## Git Add Paths` correctly lists `None`. The author followed the saved plan, kept the confidence at `inferred`, did not invent a reproduced failure, and explained why the observed two-second `pselect6` cadence matches `Net::Server::Fork` idle accept behavior rather than a proven Munin bug.
Validation is acceptable for a no-patch diagnosis: project-level `make` and `make check` were attempted with exact blockers, focused Perl syntax checks were run, and the attempted independent strace reproduction reported the sandbox ptrace blocker.perl likely remains stuck in a busy-poll loop. A diagnosis report and patch proposal were created locally.
## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.
## Patch Pass
You are working on a bounded fixer proposal.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Produce the smallest reasonable patch for the target repository, keep the change upstreamable, prefer the clearest control flow available, and do not keep avoidable `goto` when a simpler structure would read better. Before introducing new file, process, allocation, locking, networking, or platform APIs, inspect nearby code and project contribution docs for existing helpers or compatibility wrappers and use those local patterns unless you can explain why they do not fit. Validate from a reproducible workspace-root entrypoint before falling back to focused leaf commands; if a build or test cannot run, report the exact command, the exact blocker, and any narrower check you ran instead. During validation, also try one bounded independent reproduction of the collected failure signal when it is safe and cheap, such as a failing test, smoke command, perf/strace comparison, or before/after runtime check. Only use `reproduced` if that command or test actually reproduced the failure; otherwise keep `observed` and report the reproduction blocker. The final explanation must connect the observed issue evidence to the actual code change, not just paraphrase the diff. Write like a maintainer is going to read the patch mail cold: explain the bug in plain language, define subsystem-specific jargon the first time you need it, and make the causal story obvious. Explicitly classify evidence confidence as `reproduced`, `observed`, or `inferred`: `reproduced` means you reproduced the failure locally; `observed` means Fixer has direct crash/log/trace evidence but you did not independently reproduce it; `inferred` means the source patch is not pull-request-ready, so do not leave a source diff unless you first gather stronger observed/reproduced evidence; otherwise return a no-patch diagnosis/report. For any source-changing `observed` patch, say explicitly in `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. Security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior need reproduced evidence plus explicit security-impact analysis before leaving a source diff; otherwise return a no-patch diagnosis/report for human review. If you introduce non-obvious state translation, index remapping, or backend split logic, add a short source comment that explains the invariant being preserved.
Start by explaining the likely root cause from the collected perf, strace, and /proc evidence. If you cannot land a safe patch, leave a diagnosis that is strong enough for an upstream bug report.
Interpreter process expectation: when the hot process is Python, Perl, shell, Node, Ruby, PHP, Lua, or another interpreter, inspect both the runtime and the script/application entrypoint from `details.interpreter_process`. Prefer the script or application package when evidence points there; do not patch the interpreter runtime merely because the hot binary is `python`, `perl`, `bash`, or similar. Runtime fixes are welcome only after checking the entrypoint and explaining why the runtime mishandles the workload or why running bad code faster/safer is itself the right upstream fix.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Keep the change narrowly scoped and summarize validation clearly.
In every authoring pass, your final response must start with `Subject: <single-line git commit subject>` and then include these markdown sections exactly:
## Commit Message
A short upstream-friendly explanation of what changed and why. Write it in plain language that a maintainer can follow without local complaint context. If you use subsystem jargon, define it immediately.
## Evidence Confidence
Exactly one word: `reproduced`, `observed`, or `inferred`. Use `reproduced` only when you reproduced the failure locally with a command or test, and include that command/test in `## Validation`. Use `observed` when Fixer has direct crash/log/trace evidence but you did not independently reproduce it. If `## Git Add Paths` lists source files for an `observed` patch, `## Issue Connection` must explicitly say the failure was observed by Fixer and not independently reproduced. Security-sensitive source changes touching authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior require reproduced evidence and explicit security-impact analysis; otherwise list `None` under `## Git Add Paths` and write a no-patch diagnosis/report. Use `inferred` for profiler/strace/indirect evidence; inferred responses may be no-patch diagnoses or reports, but inferred source patches are not pull-request-ready until stronger evidence is gathered.
## Issue Connection
Write this as maintainer-facing patch mail, not as local Fixer notes. Cover four things explicitly in readable sentences: the user-visible symptom or the exact collected signal, the code-level cause or the cautious inference from evidence, the specific change you made, and the expected effect. Do not invent a reproducer, command line, crash, or user-visible failure that is not present in the evidence bundle. If the evidence is direct-but-not-reproduced, say it was observed by Fixer and not independently reproduced. If the evidence is indirect and you did not gather stronger evidence, do not leave a source diff; write a no-patch diagnosis/report instead. Include an explicit effect sentence such as `The expected effect is ...`, `This should reduce ...`, or `This prevents ...` for source patches. If the logic is non-obvious in code, mention that you added a short explanatory comment.
## Git Add Paths
List the repo-relative paths that belong in the final patch, one per line. Use `None` only when you intentionally made no source changes. Include intentionally new files, and do not list generated build artifacts.
## Validation
List the checks you ran, or say clearly that you could not run them. Include the independent reproduction command/test and result when `## Evidence Confidence` is `reproduced`; if reproduction was attempted but blocked, name the exact blocker and keep confidence at `observed` or `inferred`.
Before editing, read the plan at `./plan-output.txt` and follow it unless the code proves part of it wrong. If you change course, say so explicitly in the final write-up instead of silently drifting from the plan.
## Review Pass 1
You are reviewing a freshly generated fixer patch.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Review the first patch pass. The original pre-edit snapshot is available at `./source` for diffing.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout. The latest author response is at `./patch-output.txt`. Inspect the current code and changed paths like a strict code reviewer. Focus on correctness, regressions, maintainability, awkward control flow such as avoidable `goto`, missing validation, weak or non-gittable commit message text, and explanations that fail to connect the observed issue evidence to the code change. Also review the maintainer experience: the patch mail should be easy to accept upstream, the user-visible bug should be explained in plain language, subsystem-specific jargon should be defined when first used, and any non-obvious state translation or index remapping in code should have a short explanatory comment. Reject patches that omit `## Evidence Confidence`, use anything other than `reproduced`, `observed`, or `inferred`, or sound more certain than that evidence level allows. Reject patches that claim `reproduced` unless `## Validation` names the concrete reproduction command or test and its result. Reject source patches in security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior unless the author reproduced the behavior and explicitly analyzed the security impact of the change; observed-only evidence should become a diagnosis/report, not a PR-ready source diff. Reject patches that invent a reproducer, command line, crash, or user-visible failure not present in the evidence bundle; indirect profiler or strace evidence may justify a cautious mitigation, but the author must say it is indirect instead of presenting it as a confirmed upstream bug. Reject patches that introduce generic libc/std APIs when nearby code or project docs provide a local compat/helper API for the same job, unless the author explicitly justifies the exception. Reject validation that only reports a leaf object/syntax build when a project-level configure/build/test entrypoint exists and was not attempted; if a full build cannot run, the author must show the exact failed command and blocker.
Do not apply code changes in this pass.
Return a short markdown review report. The first non-empty line must be exactly one of:
RESULT: ok
RESULT: fix-needed
If you choose `RESULT: fix-needed`, add a `## Findings` section with concrete, actionable items.## Plan Pass
## Problem
Fixer observed `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` in `select()`/`pselect6`, but the retained evidence shows `State: S (sleeping)`, `wchan: poll_schedule_timeout`, only `0.9%` CPU, and `pselect6` calls blocking for about `1.8-2.0s`. That does not yet prove a Munin busy loop or a Perl runtime bug.
## Evidence Confidence
observed
## Proposed Subject
No source patch yet: diagnose the profiler finding as insufficient for an upstream Munin change unless an independent run can show a real non-blocking poll loop or high CPU in `munin-node`.
## Patch Plan
- Do not edit files in this pass.
- Treat `/usr/sbin/munin-node` as the primary target, not Perl, because the evidence identifies a script entrypoint and explicitly says runtime causality was not proven.
- If later reproduction shows actual rapid `pselect6(...)=0` wakeups or high CPU, inspect the `Net::Server::Fork` parent accept loop and Munin’s `Munin::Node::Server`/`Munin::Common::Timeout` interactions before patching.
- Follow Munin conventions from `CONTRIBUTING.md` and `HACKING.pod`: strict/warnings Perl, taint-mode compatibility, present-tense maintainer explanation, no warnings, and file-local style. Relevant local helpers found: `Munin::Common::Timeout::do_with_timeout` for bounded operations, `Munin::Common::Logger` for logging, and `Munin::Node::OS` helpers for child process handling.
- No prior Fixer patch for this finding was found in the workspace; Debian patches present are unrelated.
- Avoid awkward control flow such as adding `goto`-based loop escapes. Any later fix should be a small bounded conditional or timeout adjustment tied to reproduced behavior.
## Risks
- A source patch based only on this bundle would likely change normal daemon waiting behavior: `Net::Server::Fork` commonly waits in `select`, and this trace shows blocking sleeps rather than a tight loop.
- This touches daemon timing/loop behavior, so any patch needs clear reproduction and security/availability impact analysis before changing accept-loop or timeout semantics.
## Validation
- From the workspace root, first try project-level entrypoints: `make`, then `make check` if available; if `make check` is not a target or dependencies/generated files are missing, record the exact command and failure reason. Also use `make test` because this project’s Makefile exposes it as the test target.
- Bounded independent reproduction attempt: build generated files, then run `script/munin-node --foreground --config <temp munin-node.conf>` with a localhost-only temp config and trace it briefly with `timeout 5 strace -ttT -f -e trace=pselect6,select,poll,ppoll,epoll_wait,nanosleep,clock_nanosleep`. A real failure would need repeated near-zero-duration poll returns or materially high CPU; two-second blocking waits would confirm no patch.
## Patch Pass
Subject: Diagnose munin-node poll trace without source change
## Commit Message
No source change is included. The collected signal points at `munin-node` waiting in the daemon event loop, but the available `/proc` and `strace` evidence shows a sleeping process with multi-second `pselect6` timeouts, not a proven busy loop.
## Evidence Confidence
inferred
## Issue Connection
Fixer collected a perf/profile finding for `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` and classified it as a possible busy poll loop. The stronger details in the same bundle show `munin-node` in `State: S (sleeping)`, `wchan: poll_schedule_timeout`, about `0.9%` CPU, and `pselect6` calls timing out after roughly `1.8-2.0` seconds.
The likely root cause is a false positive from sampling a normal daemon wait path: `munin-node` uses `Net::Server::Fork`, and an idle server process is expected to block in `select`/`pselect` while waiting for work. I inspected the script entrypoint first, as required for a Perl interpreter process, and did not find evidence that the Perl runtime mishandles this workload.
I followed the saved plan and left no source diff. A timing/event-loop patch would touch daemon wait behavior and is not safe without reproduced evidence of rapid zero-duration poll wakeups or high CPU. Relevant local conventions/helpers found were `Munin::Common::Timeout::do_with_timeout`, `Munin::Common::Logger`, and `Munin::Node::OS`; no new API was introduced.
The expected effect is that this proposal becomes an upstream-ready diagnosis/report instead of a speculative source change.
## Git Add Paths
None
## Validation
`make` from the workspace root failed before building: `Can't locate Module/Build.pm in @INC ... at Build.PL line 80`, followed by `make: *** [Makefile:149: Build] Error 2`.
`make check` failed because the project has no such target: `make: *** No rule to make target 'check'. Stop.`
`make test` failed for the same missing build dependency as `make`: `Can't locate Module/Build.pm in @INC ... at Build.PL line 80`.
Focused check: `perl -T -Ilib -c script/munin-node` reported `script/munin-node syntax OK`, but this is limited because generated `Munin::Common::Defaults.pm` is absent from the checkout and Perl loaded `/usr/share/perl5/Munin/Common/Defaults.pm`.
Independent reproduction attempt: `timeout 7 strace -ttT -f -e trace=pselect6,select,poll,ppoll,epoll_wait,nanosleep,clock_nanosleep perl -T -Ilib script/munin-node ...` was blocked by sandbox ptrace restrictions: `PTRACE_TRACEME: Operation not permitted`.
Fallback smoke attempt: starting `script/munin-node --foreground` with a temp localhost config was blocked by sandbox networking: `Cannot bind and listen to TCP port 14949 on 127.0.0.1 [Operation not permitted]`.
## Review Pass 1
RESULT: ok
No source diff is present, and the author correctly returned a no-patch diagnosis for indirect profiler/trace evidence. The response includes a valid `## Evidence Confidence` value, does not claim local reproduction, reports project-level validation attempts with exact blockers, and explains why the observed `pselect6` waits do not justify a timing/event-loop patch.
The workspace is clean, so `## Git Add Paths: None` is consistent with the actual repository state.perl likely remains stuck in a busy-poll loop. A diagnosis report and patch proposal were created locally.
## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.
## Patch Pass
You are working on a bounded fixer proposal.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Produce the smallest reasonable patch for the target repository, keep the change upstreamable, prefer the clearest control flow available, and do not keep avoidable `goto` when a simpler structure would read better. Before introducing new file, process, allocation, locking, networking, or platform APIs, inspect nearby code and project contribution docs for existing helpers or compatibility wrappers and use those local patterns unless you can explain why they do not fit. Validate from a reproducible workspace-root entrypoint before falling back to focused leaf commands; if a build or test cannot run, report the exact command, the exact blocker, and any narrower check you ran instead. During validation, also try one bounded independent reproduction of the collected failure signal when it is safe and cheap, such as a failing test, smoke command, perf/strace comparison, or before/after runtime check. Only use `reproduced` if that command or test actually reproduced the failure; otherwise keep `observed` and report the reproduction blocker. The final explanation must connect the observed issue evidence to the actual code change, not just paraphrase the diff. Write like a maintainer is going to read the patch mail cold: explain the bug in plain language, define subsystem-specific jargon the first time you need it, and make the causal story obvious. Explicitly classify evidence confidence as `reproduced`, `observed`, or `inferred`: `reproduced` means you reproduced the failure locally; `observed` means Fixer has direct crash/log/trace evidence but you did not independently reproduce it; `inferred` means the source patch is not pull-request-ready, so do not leave a source diff unless you first gather stronger observed/reproduced evidence; otherwise return a no-patch diagnosis/report. For any source-changing `observed` patch, say explicitly in `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. Security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior need reproduced evidence plus explicit security-impact analysis before leaving a source diff; otherwise return a no-patch diagnosis/report for human review. If you introduce non-obvious state translation, index remapping, or backend split logic, add a short source comment that explains the invariant being preserved.
Start by explaining the likely root cause from the collected perf, strace, and /proc evidence. If you cannot land a safe patch, leave a diagnosis that is strong enough for an upstream bug report.
Interpreter process expectation: when the hot process is Python, Perl, shell, Node, Ruby, PHP, Lua, or another interpreter, inspect both the runtime and the script/application entrypoint from `details.interpreter_process`. Prefer the script or application package when evidence points there; do not patch the interpreter runtime merely because the hot binary is `python`, `perl`, `bash`, or similar. Runtime fixes are welcome only after checking the entrypoint and explaining why the runtime mishandles the workload or why running bad code faster/safer is itself the right upstream fix.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Keep the change narrowly scoped and summarize validation clearly.
In every authoring pass, your final response must start with `Subject: <single-line git commit subject>` and then include these markdown sections exactly:
## Commit Message
A short upstream-friendly explanation of what changed and why. Write it in plain language that a maintainer can follow without local complaint context. If you use subsystem jargon, define it immediately.
## Evidence Confidence
Exactly one word: `reproduced`, `observed`, or `inferred`. Use `reproduced` only when you reproduced the failure locally with a command or test, and include that command/test in `## Validation`. Use `observed` when Fixer has direct crash/log/trace evidence but you did not independently reproduce it. If `## Git Add Paths` lists source files for an `observed` patch, `## Issue Connection` must explicitly say the failure was observed by Fixer and not independently reproduced. Security-sensitive source changes touching authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior require reproduced evidence and explicit security-impact analysis; otherwise list `None` under `## Git Add Paths` and write a no-patch diagnosis/report. Use `inferred` for profiler/strace/indirect evidence; inferred responses may be no-patch diagnoses or reports, but inferred source patches are not pull-request-ready until stronger evidence is gathered.
## Issue Connection
Write this as maintainer-facing patch mail, not as local Fixer notes. Cover four things explicitly in readable sentences: the user-visible symptom or the exact collected signal, the code-level cause or the cautious inference from evidence, the specific change you made, and the expected effect. Do not invent a reproducer, command line, crash, or user-visible failure that is not present in the evidence bundle. If the evidence is direct-but-not-reproduced, say it was observed by Fixer and not independently reproduced. If the evidence is indirect and you did not gather stronger evidence, do not leave a source diff; write a no-patch diagnosis/report instead. Include an explicit effect sentence such as `The expected effect is ...`, `This should reduce ...`, or `This prevents ...` for source patches. If the logic is non-obvious in code, mention that you added a short explanatory comment.
## Git Add Paths
List the repo-relative paths that belong in the final patch, one per line. Use `None` only when you intentionally made no source changes. Include intentionally new files, and do not list generated build artifacts.
## Validation
List the checks you ran, or say clearly that you could not run them. Include the independent reproduction command/test and result when `## Evidence Confidence` is `reproduced`; if reproduction was attempted but blocked, name the exact blocker and keep confidence at `observed` or `inferred`.
Before editing, read the plan at `./plan-output.txt` and follow it unless the code proves part of it wrong. If you change course, say so explicitly in the final write-up instead of silently drifting from the plan.
## Review Pass 1
You are reviewing a freshly generated fixer patch.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Review the first patch pass. The original pre-edit snapshot is available at `./source` for diffing.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout. The latest author response is at `./patch-output.txt`. Inspect the current code and changed paths like a strict code reviewer. Focus on correctness, regressions, maintainability, awkward control flow such as avoidable `goto`, missing validation, weak or non-gittable commit message text, and explanations that fail to connect the observed issue evidence to the code change. Also review the maintainer experience: the patch mail should be easy to accept upstream, the user-visible bug should be explained in plain language, subsystem-specific jargon should be defined when first used, and any non-obvious state translation or index remapping in code should have a short explanatory comment. Reject patches that omit `## Evidence Confidence`, use anything other than `reproduced`, `observed`, or `inferred`, or sound more certain than that evidence level allows. Reject patches that claim `reproduced` unless `## Validation` names the concrete reproduction command or test and its result. Reject source patches in security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior unless the author reproduced the behavior and explicitly analyzed the security impact of the change; observed-only evidence should become a diagnosis/report, not a PR-ready source diff. Reject patches that invent a reproducer, command line, crash, or user-visible failure not present in the evidence bundle; indirect profiler or strace evidence may justify a cautious mitigation, but the author must say it is indirect instead of presenting it as a confirmed upstream bug. Reject patches that introduce generic libc/std APIs when nearby code or project docs provide a local compat/helper API for the same job, unless the author explicitly justifies the exception. Reject validation that only reports a leaf object/syntax build when a project-level configure/build/test entrypoint exists and was not attempted; if a full build cannot run, the author must show the exact failed command and blocker.
Do not apply code changes in this pass.
Return a short markdown review report. The first non-empty line must be exactly one of:
RESULT: ok
RESULT: fix-needed
If you choose `RESULT: fix-needed`, add a `## Findings` section with concrete, actionable items.## Plan Pass
## Problem
Fixer observed `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` in `select()`/`pselect6`, but the retained evidence shows `State: S (sleeping)`, `wchan: poll_schedule_timeout`, only `0.9%` CPU, and `pselect6` calls blocking for about `1.8-2.0s`. That does not yet prove a Munin busy loop or a Perl runtime bug.
## Evidence Confidence
observed
## Proposed Subject
No source patch yet: diagnose the profiler finding as insufficient for an upstream Munin change unless an independent run can show a real non-blocking poll loop or high CPU in `munin-node`.
## Patch Plan
- Do not edit files in this pass.
- Treat `/usr/sbin/munin-node` as the primary target, not Perl, because the evidence identifies a script entrypoint and explicitly says runtime causality was not proven.
- If later reproduction shows actual rapid `pselect6(...)=0` wakeups or high CPU, inspect the `Net::Server::Fork` parent accept loop and Munin’s `Munin::Node::Server`/`Munin::Common::Timeout` interactions before patching.
- Follow Munin conventions from `CONTRIBUTING.md` and `HACKING.pod`: strict/warnings Perl, taint-mode compatibility, present-tense maintainer explanation, no warnings, and file-local style. Relevant local helpers found: `Munin::Common::Timeout::do_with_timeout` for bounded operations, `Munin::Common::Logger` for logging, and `Munin::Node::OS` helpers for child process handling.
- No prior Fixer patch for this finding was found in the workspace; Debian patches present are unrelated.
- Avoid awkward control flow such as adding `goto`-based loop escapes. Any later fix should be a small bounded conditional or timeout adjustment tied to reproduced behavior.
## Risks
- A source patch based only on this bundle would likely change normal daemon waiting behavior: `Net::Server::Fork` commonly waits in `select`, and this trace shows blocking sleeps rather than a tight loop.
- This touches daemon timing/loop behavior, so any patch needs clear reproduction and security/availability impact analysis before changing accept-loop or timeout semantics.
## Validation
- From the workspace root, first try project-level entrypoints: `make`, then `make check` if available; if `make check` is not a target or dependencies/generated files are missing, record the exact command and failure reason. Also use `make test` because this project’s Makefile exposes it as the test target.
- Bounded independent reproduction attempt: build generated files, then run `script/munin-node --foreground --config <temp munin-node.conf>` with a localhost-only temp config and trace it briefly with `timeout 5 strace -ttT -f -e trace=pselect6,select,poll,ppoll,epoll_wait,nanosleep,clock_nanosleep`. A real failure would need repeated near-zero-duration poll returns or materially high CPU; two-second blocking waits would confirm no patch.
## Patch Pass
Subject: Diagnose munin-node poll trace without source change
## Commit Message
No source change is included. The collected signal points at `munin-node` waiting in the daemon event loop, but the available `/proc` and `strace` evidence shows a sleeping process with multi-second `pselect6` timeouts, not a proven busy loop.
## Evidence Confidence
inferred
## Issue Connection
Fixer collected a perf/profile finding for `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` and classified it as a possible busy poll loop. The stronger details in the same bundle show `munin-node` in `State: S (sleeping)`, `wchan: poll_schedule_timeout`, about `0.9%` CPU, and `pselect6` calls timing out after roughly `1.8-2.0` seconds.
The likely root cause is a false positive from sampling a normal daemon wait path: `munin-node` uses `Net::Server::Fork`, and an idle server process is expected to block in `select`/`pselect` while waiting for work. I inspected the script entrypoint first, as required for a Perl interpreter process, and did not find evidence that the Perl runtime mishandles this workload.
I followed the saved plan and left no source diff. A timing/event-loop patch would touch daemon wait behavior and is not safe without reproduced evidence of rapid zero-duration poll wakeups or high CPU. Relevant local conventions/helpers found were `Munin::Common::Timeout::do_with_timeout`, `Munin::Common::Logger`, and `Munin::Node::OS`; no new API was introduced.
The expected effect is that this proposal becomes an upstream-ready diagnosis/report instead of a speculative source change.
## Git Add Paths
None
## Validation
`make` from the workspace root failed before building: `Can't locate Module/Build.pm in @INC ... at Build.PL line 80`, followed by `make: *** [Makefile:149: Build] Error 2`.
`make check` failed because the project has no such target: `make: *** No rule to make target 'check'. Stop.`
`make test` failed for the same missing build dependency as `make`: `Can't locate Module/Build.pm in @INC ... at Build.PL line 80`.
Focused check: `perl -T -Ilib -c script/munin-node` reported `script/munin-node syntax OK`, but this is limited because generated `Munin::Common::Defaults.pm` is absent from the checkout and Perl loaded `/usr/share/perl5/Munin/Common/Defaults.pm`.
Independent reproduction attempt: `timeout 7 strace -ttT -f -e trace=pselect6,select,poll,ppoll,epoll_wait,nanosleep,clock_nanosleep perl -T -Ilib script/munin-node ...` was blocked by sandbox ptrace restrictions: `PTRACE_TRACEME: Operation not permitted`.
Fallback smoke attempt: starting `script/munin-node --foreground` with a temp localhost config was blocked by sandbox networking: `Cannot bind and listen to TCP port 14949 on 127.0.0.1 [Operation not permitted]`.
## Review Pass 1
RESULT: ok
No source diff is present, and the author correctly returned a no-patch diagnosis for indirect profiler/trace evidence. The response includes a valid `## Evidence Confidence` value, does not claim local reproduction, reports project-level validation attempts with exact blockers, and explains why the observed `pselect6` waits do not justify a timing/event-loop patch.
The workspace is clean, so `## Git Add Paths: None` is consistent with the actual repository state.perl likely remains stuck in a busy-poll loop. A diagnosis report and patch proposal were created locally.
## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.
## Patch Pass
You are working on a bounded fixer proposal.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Produce the smallest reasonable patch for the target repository, keep the change upstreamable, prefer the clearest control flow available, and do not keep avoidable `goto` when a simpler structure would read better. Before introducing new file, process, allocation, locking, networking, or platform APIs, inspect nearby code and project contribution docs for existing helpers or compatibility wrappers and use those local patterns unless you can explain why they do not fit. Validate from a reproducible workspace-root entrypoint before falling back to focused leaf commands; if a build or test cannot run, report the exact command, the exact blocker, and any narrower check you ran instead. During validation, also try one bounded independent reproduction of the collected failure signal when it is safe and cheap, such as a failing test, smoke command, perf/strace comparison, or before/after runtime check. Only use `reproduced` if that command or test actually reproduced the failure; otherwise keep `observed` and report the reproduction blocker. The final explanation must connect the observed issue evidence to the actual code change, not just paraphrase the diff. Write like a maintainer is going to read the patch mail cold: explain the bug in plain language, define subsystem-specific jargon the first time you need it, and make the causal story obvious. Explicitly classify evidence confidence as `reproduced`, `observed`, or `inferred`: `reproduced` means you reproduced the failure locally; `observed` means Fixer has direct crash/log/trace evidence but you did not independently reproduce it; `inferred` means the source patch is not pull-request-ready, so do not leave a source diff unless you first gather stronger observed/reproduced evidence; otherwise return a no-patch diagnosis/report. For any source-changing `observed` patch, say explicitly in `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. Security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior need reproduced evidence plus explicit security-impact analysis before leaving a source diff; otherwise return a no-patch diagnosis/report for human review. If you introduce non-obvious state translation, index remapping, or backend split logic, add a short source comment that explains the invariant being preserved.
Start by explaining the likely root cause from the collected perf, strace, and /proc evidence. If you cannot land a safe patch, leave a diagnosis that is strong enough for an upstream bug report.
Interpreter process expectation: when the hot process is Python, Perl, shell, Node, Ruby, PHP, Lua, or another interpreter, inspect both the runtime and the script/application entrypoint from `details.interpreter_process`. Prefer the script or application package when evidence points there; do not patch the interpreter runtime merely because the hot binary is `python`, `perl`, `bash`, or similar. Runtime fixes are welcome only after checking the entrypoint and explaining why the runtime mishandles the workload or why running bad code faster/safer is itself the right upstream fix.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Keep the change narrowly scoped and summarize validation clearly.
In every authoring pass, your final response must start with `Subject: <single-line git commit subject>` and then include these markdown sections exactly:
## Commit Message
A short upstream-friendly explanation of what changed and why. Write it in plain language that a maintainer can follow without local complaint context. If you use subsystem jargon, define it immediately.
## Evidence Confidence
Exactly one word: `reproduced`, `observed`, or `inferred`. Use `reproduced` only when you reproduced the failure locally with a command or test, and include that command/test in `## Validation`. Use `observed` when Fixer has direct crash/log/trace evidence but you did not independently reproduce it. If `## Git Add Paths` lists source files for an `observed` patch, `## Issue Connection` must explicitly say the failure was observed by Fixer and not independently reproduced. Security-sensitive source changes touching authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior require reproduced evidence and explicit security-impact analysis; otherwise list `None` under `## Git Add Paths` and write a no-patch diagnosis/report. Use `inferred` for profiler/strace/indirect evidence; inferred responses may be no-patch diagnoses or reports, but inferred source patches are not pull-request-ready until stronger evidence is gathered.
## Issue Connection
Write this as maintainer-facing patch mail, not as local Fixer notes. Cover four things explicitly in readable sentences: the user-visible symptom or the exact collected signal, the code-level cause or the cautious inference from evidence, the specific change you made, and the expected effect. Do not invent a reproducer, command line, crash, or user-visible failure that is not present in the evidence bundle. If the evidence is direct-but-not-reproduced, say it was observed by Fixer and not independently reproduced. If the evidence is indirect and you did not gather stronger evidence, do not leave a source diff; write a no-patch diagnosis/report instead. Include an explicit effect sentence such as `The expected effect is ...`, `This should reduce ...`, or `This prevents ...` for source patches. If the logic is non-obvious in code, mention that you added a short explanatory comment.
## Git Add Paths
List the repo-relative paths that belong in the final patch, one per line. Use `None` only when you intentionally made no source changes. Include intentionally new files, and do not list generated build artifacts.
## Validation
List the checks you ran, or say clearly that you could not run them. Include the independent reproduction command/test and result when `## Evidence Confidence` is `reproduced`; if reproduction was attempted but blocked, name the exact blocker and keep confidence at `observed` or `inferred`.
Before editing, read the plan at `./plan-output.txt` and follow it unless the code proves part of it wrong. If you change course, say so explicitly in the final write-up instead of silently drifting from the plan.
## Review Pass 1
You are reviewing a freshly generated fixer patch.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Review the first patch pass. The original pre-edit snapshot is available at `./source` for diffing.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout. The latest author response is at `./patch-output.txt`. Inspect the current code and changed paths like a strict code reviewer. Focus on correctness, regressions, maintainability, awkward control flow such as avoidable `goto`, missing validation, weak or non-gittable commit message text, and explanations that fail to connect the observed issue evidence to the code change. Also review the maintainer experience: the patch mail should be easy to accept upstream, the user-visible bug should be explained in plain language, subsystem-specific jargon should be defined when first used, and any non-obvious state translation or index remapping in code should have a short explanatory comment. Reject patches that omit `## Evidence Confidence`, use anything other than `reproduced`, `observed`, or `inferred`, or sound more certain than that evidence level allows. Reject patches that claim `reproduced` unless `## Validation` names the concrete reproduction command or test and its result. Reject source patches in security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior unless the author reproduced the behavior and explicitly analyzed the security impact of the change; observed-only evidence should become a diagnosis/report, not a PR-ready source diff. Reject patches that invent a reproducer, command line, crash, or user-visible failure not present in the evidence bundle; indirect profiler or strace evidence may justify a cautious mitigation, but the author must say it is indirect instead of presenting it as a confirmed upstream bug. Reject patches that introduce generic libc/std APIs when nearby code or project docs provide a local compat/helper API for the same job, unless the author explicitly justifies the exception. Reject validation that only reports a leaf object/syntax build when a project-level configure/build/test entrypoint exists and was not attempted; if a full build cannot run, the author must show the exact failed command and blocker.
Do not apply code changes in this pass.
Return a short markdown review report. The first non-empty line must be exactly one of:
RESULT: ok
RESULT: fix-needed
If you choose `RESULT: fix-needed`, add a `## Findings` section with concrete, actionable items.## Plan Pass
## Problem
Fixer observed `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` in `pselect6`, but the retained evidence lacks a Perl-level stack tying the samples to Munin code. The strace excerpt shows `pselect6` calls blocking for about 1.8-2.0 seconds with process state `S (sleeping)` and only `0.9%` max CPU, which looks more like an idle Net::Server wait than a confirmed busy loop.
## Evidence Confidence
observed
## Proposed Subject
No source patch yet: treat the finding as an observed idle/poll diagnosis unless a bounded reproduction shows rapid nonblocking wakeups in `munin-node`.
## Patch Plan
Do not edit Munin in this pass. A source patch would be speculative because the evidence is profiler-only/indirect and does not show a script-level loop, zero-duration poll returns, or elevated CPU from Munin code.
Relevant code path inspected: `script/munin-node` initializes config/services and calls `Munin::Node::Server->run`; `lib/Munin/Node/Server.pm` inherits `Net::Server::Fork`, reads commands through `_net_read`, and bounds sessions with `Munin::Common::Timeout::do_with_timeout`.
Local conventions/helpers found: `Munin::Common::Timeout` for timeout handling, `Munin::Common::Logger` for diagnostics, `Munin::Common::Daemon::emit_sd_notify_message` for readiness, and Net::Server configuration for daemon/socket behavior. No relevant local helper was found that would turn the observed idle select into a Munin-level fix.
No prior Fixer patch for this issue was found in the workspace or Debian patch series. If later evidence shows a real rapid wakeup loop, plan a small upstream-style change in the specific loop source, using straight bounded conditionals and local helpers rather than awkward `goto` control flow.
## Risks
Closing without a patch could miss an intermittent workload-specific loop, but patching now risks changing normal daemon idle behavior without proof.
This is a network daemon path, but the current plan does not touch authentication, authorization, credentials, cryptography, permissions, sandboxing, or timing/throttling behavior.
## Validation
First try the project entrypoint from the workspace root: `make`. The Makefile exposes `test` rather than `check`, so run `make check` only if available, otherwise use `make test`.
Bounded independent signal check: after build, run `munin-node` in foreground with a temporary localhost/test config under `timeout` and `strace -ttT -f -e trace=pselect6,select,poll,ppoll,nanosleep`, then verify whether waits block for meaningful time or return rapidly. Do not claim reproduced unless that command shows the failure signal as rapid repeated poll-family wakeups.
## Patch Pass
Subject: Diagnose munin-node select profile as inconclusive
## Commit Message
No source change is proposed. The collected perf, strace, and `/proc` evidence points to `munin-node` being sampled while idle in its normal Net::Server accept/select wait, not to a proven Perl or Munin busy loop.
## Evidence Confidence
inferred
## Issue Connection
Fixer collected a Perl process signal for `/usr/bin/perl -wT /usr/sbin/munin-node --foreground`: native frames under `select()`, kernel stack `poll_schedule_timeout`, and repeated `pselect6` calls. The key detail is that the captured `pselect6` calls blocked for about 1.8-2.0 seconds, while `/proc` reported state `S (sleeping)` and only `0.9%` CPU. That is not enough to identify a tight event-loop wakeup in Munin.
The cautious code-level inference is that this is likely normal idle daemon behavior in `Munin::Node::Server`, which inherits `Net::Server::Fork`, rather than a source bug. I inspected the Perl entrypoint first, as required for interpreter processes: `script/munin-node` builds config/services and calls `Munin::Node::Server->run`. Nearby local helpers/conventions are `Munin::Common::Timeout::do_with_timeout`, `Munin::Common::Logger`, `Munin::Common::Daemon::emit_sd_notify_message`, and Net::Server configuration; none provides a clear source fix for the observed idle wait.
The specific change made is no source diff. The expected effect is no behavior change and no speculative upstream patch based only on indirect profiler evidence. A useful upstream report should ask for a Perl-level stack or attachable trace from an actually high-CPU `munin-node` process showing rapid nonblocking poll returns.
## Git Add Paths
None
## Validation
`make` from the workspace root failed before building Munin because `Module::Build` is missing: `Can't locate Module/Build.pm in @INC ... at Build.PL line 80`, followed by `make: *** [Makefile:149: Build] Error 2`.
`make -n check` failed because this Makefile has no `check` target: `make: *** No rule to make target 'check'. Stop.` The available project test target is `test`, but it depends on the same missing `Build` setup.
Focused checks:
`perl -Ilib -c lib/Munin/Node/Server.pm` passed.
`perl -Ilib -c lib/Munin/Common/Timeout.pm` passed.
`perl -T -Ilib -c script/munin-node` passed.
Independent reproduction attempt:
`strace -ff -ttT -e trace=pselect6,select,poll,ppoll,nanosleep ... munin-node ...` was blocked by sandbox ptrace restrictions: `PTRACE_TRACEME: Operation not permitted`.
Fallback runtime smoke attempt:
Running `script/munin-node` with an isolated temporary config exited before the idle loop because the sandbox denies binding the localhost TCP listener: `Cannot bind and listen to TCP port 49511 on 127.0.0.1 [Operation not permitted]`.
I therefore did not reproduce the reported failure locally and left no patch.
## Review Pass 1
RESULT: ok
No source changes are present in the workspace, and `patch-output.txt` correctly treats the profiler/strace evidence as inconclusive rather than presenting a speculative Munin fix.
The report includes the required `## Evidence Confidence` section with a valid value, lists `None` under `## Git Add Paths`, connects the evidence to the no-patch diagnosis, names the relevant local helpers/conventions, and reports project-level validation blockers with exact commands and failure reasons. The author also attempted a bounded independent reproduction and kept the confidence below `reproduced` because the sandbox blocked ptrace and local TCP binding.perl likely remains stuck in a busy-poll loop. A diagnosis report and patch proposal were created locally.
## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.
## Patch Pass
You are working on a bounded fixer proposal.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Produce the smallest reasonable patch for the target repository, keep the change upstreamable, prefer the clearest control flow available, and do not keep avoidable `goto` when a simpler structure would read better. Before introducing new file, process, allocation, locking, networking, or platform APIs, inspect nearby code and project contribution docs for existing helpers or compatibility wrappers and use those local patterns unless you can explain why they do not fit. Validate from a reproducible workspace-root entrypoint before falling back to focused leaf commands; if a build or test cannot run, report the exact command, the exact blocker, and any narrower check you ran instead. During validation, also try one bounded independent reproduction of the collected failure signal when it is safe and cheap, such as a failing test, smoke command, perf/strace comparison, or before/after runtime check. Only use `reproduced` if that command or test actually reproduced the failure; otherwise keep `observed` and report the reproduction blocker. The final explanation must connect the observed issue evidence to the actual code change, not just paraphrase the diff. Write like a maintainer is going to read the patch mail cold: explain the bug in plain language, define subsystem-specific jargon the first time you need it, and make the causal story obvious. Explicitly classify evidence confidence as `reproduced`, `observed`, or `inferred`: `reproduced` means you reproduced the failure locally; `observed` means Fixer has direct crash/log/trace evidence but you did not independently reproduce it; `inferred` means the source patch is not pull-request-ready, so do not leave a source diff unless you first gather stronger observed/reproduced evidence; otherwise return a no-patch diagnosis/report. For any source-changing `observed` patch, say explicitly in `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. Security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior need reproduced evidence plus explicit security-impact analysis before leaving a source diff; otherwise return a no-patch diagnosis/report for human review. If you introduce non-obvious state translation, index remapping, or backend split logic, add a short source comment that explains the invariant being preserved.
Start by explaining the likely root cause from the collected perf, strace, and /proc evidence. If you cannot land a safe patch, leave a diagnosis that is strong enough for an upstream bug report.
Interpreter process expectation: when the hot process is Python, Perl, shell, Node, Ruby, PHP, Lua, or another interpreter, inspect both the runtime and the script/application entrypoint from `details.interpreter_process`. Prefer the script or application package when evidence points there; do not patch the interpreter runtime merely because the hot binary is `python`, `perl`, `bash`, or similar. Runtime fixes are welcome only after checking the entrypoint and explaining why the runtime mishandles the workload or why running bad code faster/safer is itself the right upstream fix.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Keep the change narrowly scoped and summarize validation clearly.
In every authoring pass, your final response must start with `Subject: <single-line git commit subject>` and then include these markdown sections exactly:
## Commit Message
A short upstream-friendly explanation of what changed and why. Write it in plain language that a maintainer can follow without local complaint context. If you use subsystem jargon, define it immediately.
## Evidence Confidence
Exactly one word: `reproduced`, `observed`, or `inferred`. Use `reproduced` only when you reproduced the failure locally with a command or test, and include that command/test in `## Validation`. Use `observed` when Fixer has direct crash/log/trace evidence but you did not independently reproduce it. If `## Git Add Paths` lists source files for an `observed` patch, `## Issue Connection` must explicitly say the failure was observed by Fixer and not independently reproduced. Security-sensitive source changes touching authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior require reproduced evidence and explicit security-impact analysis; otherwise list `None` under `## Git Add Paths` and write a no-patch diagnosis/report. Use `inferred` for profiler/strace/indirect evidence; inferred responses may be no-patch diagnoses or reports, but inferred source patches are not pull-request-ready until stronger evidence is gathered.
## Issue Connection
Write this as maintainer-facing patch mail, not as local Fixer notes. Cover four things explicitly in readable sentences: the user-visible symptom or the exact collected signal, the code-level cause or the cautious inference from evidence, the specific change you made, and the expected effect. Do not invent a reproducer, command line, crash, or user-visible failure that is not present in the evidence bundle. If the evidence is direct-but-not-reproduced, say it was observed by Fixer and not independently reproduced. If the evidence is indirect and you did not gather stronger evidence, do not leave a source diff; write a no-patch diagnosis/report instead. Include an explicit effect sentence such as `The expected effect is ...`, `This should reduce ...`, or `This prevents ...` for source patches. If the logic is non-obvious in code, mention that you added a short explanatory comment.
## Git Add Paths
List the repo-relative paths that belong in the final patch, one per line. Use `None` only when you intentionally made no source changes. Include intentionally new files, and do not list generated build artifacts.
## Validation
List the checks you ran, or say clearly that you could not run them. Include the independent reproduction command/test and result when `## Evidence Confidence` is `reproduced`; if reproduction was attempted but blocked, name the exact blocker and keep confidence at `observed` or `inferred`.
Before editing, read the plan at `./plan-output.txt` and follow it unless the code proves part of it wrong. If you change course, say so explicitly in the final write-up instead of silently drifting from the plan.
## Review Pass 1
You are reviewing a freshly generated fixer patch.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Review the first patch pass. The original pre-edit snapshot is available at `./source` for diffing.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout. The latest author response is at `./patch-output.txt`. Inspect the current code and changed paths like a strict code reviewer. Focus on correctness, regressions, maintainability, awkward control flow such as avoidable `goto`, missing validation, weak or non-gittable commit message text, and explanations that fail to connect the observed issue evidence to the code change. Also review the maintainer experience: the patch mail should be easy to accept upstream, the user-visible bug should be explained in plain language, subsystem-specific jargon should be defined when first used, and any non-obvious state translation or index remapping in code should have a short explanatory comment. Reject patches that omit `## Evidence Confidence`, use anything other than `reproduced`, `observed`, or `inferred`, or sound more certain than that evidence level allows. Reject patches that claim `reproduced` unless `## Validation` names the concrete reproduction command or test and its result. Reject source patches in security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior unless the author reproduced the behavior and explicitly analyzed the security impact of the change; observed-only evidence should become a diagnosis/report, not a PR-ready source diff. Reject patches that invent a reproducer, command line, crash, or user-visible failure not present in the evidence bundle; indirect profiler or strace evidence may justify a cautious mitigation, but the author must say it is indirect instead of presenting it as a confirmed upstream bug. Reject patches that introduce generic libc/std APIs when nearby code or project docs provide a local compat/helper API for the same job, unless the author explicitly justifies the exception. Reject validation that only reports a leaf object/syntax build when a project-level configure/build/test entrypoint exists and was not attempted; if a full build cannot run, the author must show the exact failed command and blocker.
Do not apply code changes in this pass.
Return a short markdown review report. The first non-empty line must be exactly one of:
RESULT: ok
RESULT: fix-needed
If you choose `RESULT: fix-needed`, add a `## Findings` section with concrete, actionable items.## Plan Pass
## Problem
Fixer observed `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` in `pselect6`, but the retained evidence lacks a Perl-level stack tying the samples to Munin code. The strace excerpt shows `pselect6` calls blocking for about 1.8-2.0 seconds with process state `S (sleeping)` and only `0.9%` max CPU, which looks more like an idle Net::Server wait than a confirmed busy loop.
## Evidence Confidence
observed
## Proposed Subject
No source patch yet: treat the finding as an observed idle/poll diagnosis unless a bounded reproduction shows rapid nonblocking wakeups in `munin-node`.
## Patch Plan
Do not edit Munin in this pass. A source patch would be speculative because the evidence is profiler-only/indirect and does not show a script-level loop, zero-duration poll returns, or elevated CPU from Munin code.
Relevant code path inspected: `script/munin-node` initializes config/services and calls `Munin::Node::Server->run`; `lib/Munin/Node/Server.pm` inherits `Net::Server::Fork`, reads commands through `_net_read`, and bounds sessions with `Munin::Common::Timeout::do_with_timeout`.
Local conventions/helpers found: `Munin::Common::Timeout` for timeout handling, `Munin::Common::Logger` for diagnostics, `Munin::Common::Daemon::emit_sd_notify_message` for readiness, and Net::Server configuration for daemon/socket behavior. No relevant local helper was found that would turn the observed idle select into a Munin-level fix.
No prior Fixer patch for this issue was found in the workspace or Debian patch series. If later evidence shows a real rapid wakeup loop, plan a small upstream-style change in the specific loop source, using straight bounded conditionals and local helpers rather than awkward `goto` control flow.
## Risks
Closing without a patch could miss an intermittent workload-specific loop, but patching now risks changing normal daemon idle behavior without proof.
This is a network daemon path, but the current plan does not touch authentication, authorization, credentials, cryptography, permissions, sandboxing, or timing/throttling behavior.
## Validation
First try the project entrypoint from the workspace root: `make`. The Makefile exposes `test` rather than `check`, so run `make check` only if available, otherwise use `make test`.
Bounded independent signal check: after build, run `munin-node` in foreground with a temporary localhost/test config under `timeout` and `strace -ttT -f -e trace=pselect6,select,poll,ppoll,nanosleep`, then verify whether waits block for meaningful time or return rapidly. Do not claim reproduced unless that command shows the failure signal as rapid repeated poll-family wakeups.
## Patch Pass
Subject: Diagnose munin-node select profile as inconclusive
## Commit Message
No source change is proposed. The collected perf, strace, and `/proc` evidence points to `munin-node` being sampled while idle in its normal Net::Server accept/select wait, not to a proven Perl or Munin busy loop.
## Evidence Confidence
inferred
## Issue Connection
Fixer collected a Perl process signal for `/usr/bin/perl -wT /usr/sbin/munin-node --foreground`: native frames under `select()`, kernel stack `poll_schedule_timeout`, and repeated `pselect6` calls. The key detail is that the captured `pselect6` calls blocked for about 1.8-2.0 seconds, while `/proc` reported state `S (sleeping)` and only `0.9%` CPU. That is not enough to identify a tight event-loop wakeup in Munin.
The cautious code-level inference is that this is likely normal idle daemon behavior in `Munin::Node::Server`, which inherits `Net::Server::Fork`, rather than a source bug. I inspected the Perl entrypoint first, as required for interpreter processes: `script/munin-node` builds config/services and calls `Munin::Node::Server->run`. Nearby local helpers/conventions are `Munin::Common::Timeout::do_with_timeout`, `Munin::Common::Logger`, `Munin::Common::Daemon::emit_sd_notify_message`, and Net::Server configuration; none provides a clear source fix for the observed idle wait.
The specific change made is no source diff. The expected effect is no behavior change and no speculative upstream patch based only on indirect profiler evidence. A useful upstream report should ask for a Perl-level stack or attachable trace from an actually high-CPU `munin-node` process showing rapid nonblocking poll returns.
## Git Add Paths
None
## Validation
`make` from the workspace root failed before building Munin because `Module::Build` is missing: `Can't locate Module/Build.pm in @INC ... at Build.PL line 80`, followed by `make: *** [Makefile:149: Build] Error 2`.
`make -n check` failed because this Makefile has no `check` target: `make: *** No rule to make target 'check'. Stop.` The available project test target is `test`, but it depends on the same missing `Build` setup.
Focused checks:
`perl -Ilib -c lib/Munin/Node/Server.pm` passed.
`perl -Ilib -c lib/Munin/Common/Timeout.pm` passed.
`perl -T -Ilib -c script/munin-node` passed.
Independent reproduction attempt:
`strace -ff -ttT -e trace=pselect6,select,poll,ppoll,nanosleep ... munin-node ...` was blocked by sandbox ptrace restrictions: `PTRACE_TRACEME: Operation not permitted`.
Fallback runtime smoke attempt:
Running `script/munin-node` with an isolated temporary config exited before the idle loop because the sandbox denies binding the localhost TCP listener: `Cannot bind and listen to TCP port 49511 on 127.0.0.1 [Operation not permitted]`.
I therefore did not reproduce the reported failure locally and left no patch.
## Review Pass 1
RESULT: ok
No source changes are present in the workspace, and `patch-output.txt` correctly treats the profiler/strace evidence as inconclusive rather than presenting a speculative Munin fix.
The report includes the required `## Evidence Confidence` section with a valid value, lists `None` under `## Git Add Paths`, connects the evidence to the no-patch diagnosis, names the relevant local helpers/conventions, and reports project-level validation blockers with exact commands and failure reasons. The author also attempted a bounded independent reproduction and kept the confidence below `reproduced` because the sandbox blocked ptrace and local TCP binding.perl likely remains stuck in a busy-poll loop. The diagnosis was captured, but the patch proposal did not complete cleanly.
timeout
Codex stage timed out after 900 second(s)./usr/bin/perl -wT /usr/sbin/munin-node --foregroundThe trace repeatedly returns to a poll-family syscall without meaningful blocking, which suggests a busy event-loop wakeup.
Thread 1 (Thread 0x7f82eb914b80 (LWP 3947104) "munin-node"):
#0 0x00007f82eb9e87d2 in ?? () from target:<path>
#1 0x00007f82eb9e87ed in ?? () from target:<path>
#2 0x00007f82eba686cf in select () from target:<path>
#3 0x000055b5551b8ee4 in ?? ()
#4 0x000055b55521a496 in Perl_runops_standard ()
#5 0x000055b555100b85 in perl_run ()
#6 0x000055b5550d35ae in main ()## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.## Plan Pass
## Workflow Note
Codex stage timed out after 900 second(s).perl likely remains stuck in a busy-poll loop. The diagnosis was captured, but the patch proposal did not complete cleanly.
timeout
Codex stage timed out after 900 second(s)./usr/bin/perl -wT /usr/sbin/munin-node --foregroundThe trace repeatedly returns to a poll-family syscall without meaningful blocking, which suggests a busy event-loop wakeup.
Thread 1 (Thread 0x7f82eb914b80 (LWP 3947104) "munin-node"):
#0 0x00007f82eb9e87d2 in ?? () from target:<path>
#1 0x00007f82eb9e87ed in ?? () from target:<path>
#2 0x00007f82eba686cf in select () from target:<path>
#3 0x000055b5551b8ee4 in ?? ()
#4 0x000055b55521a496 in Perl_runops_standard ()
#5 0x000055b555100b85 in perl_run ()
#6 0x000055b5550d35ae in main ()## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.## Plan Pass
## Workflow Note
Codex stage timed out after 900 second(s).perl likely remains stuck in a busy-poll loop. The diagnosis was captured, but the patch proposal did not complete cleanly.
timeout
Codex stage timed out after 900 second(s)./usr/bin/perl -wT /usr/sbin/munin-node --foregroundThe trace repeatedly returns to a poll-family syscall without meaningful blocking, which suggests a busy event-loop wakeup.
Thread 1 (Thread 0x7f82eb914b80 (LWP 3947104) "munin-node"):
#0 0x00007f82eb9e87d2 in ?? () from target:<path>
#1 0x00007f82eb9e87ed in ?? () from target:<path>
#2 0x00007f82eba686cf in select () from target:<path>
#3 0x000055b5551b8ee4 in ?? ()
#4 0x000055b55521a496 in Perl_runops_standard ()
#5 0x000055b555100b85 in perl_run ()
#6 0x000055b5550d35ae in main ()## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.## Plan Pass
## Workflow Note
Codex stage timed out after 900 second(s).perl likely remains stuck in a busy-poll loop. A diagnosis report and patch proposal were created locally.
## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.
## Patch Pass
You are working on a bounded fixer proposal.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Produce the smallest reasonable patch for the target repository, keep the change upstreamable, prefer the clearest control flow available, and do not keep avoidable `goto` when a simpler structure would read better. Before introducing new file, process, allocation, locking, networking, or platform APIs, inspect nearby code and project contribution docs for existing helpers or compatibility wrappers and use those local patterns unless you can explain why they do not fit. Validate from a reproducible workspace-root entrypoint before falling back to focused leaf commands; if a build or test cannot run, report the exact command, the exact blocker, and any narrower check you ran instead. During validation, also try one bounded independent reproduction of the collected failure signal when it is safe and cheap, such as a failing test, smoke command, perf/strace comparison, or before/after runtime check. Only use `reproduced` if that command or test actually reproduced the failure; otherwise keep `observed` and report the reproduction blocker. The final explanation must connect the observed issue evidence to the actual code change, not just paraphrase the diff. Write like a maintainer is going to read the patch mail cold: explain the bug in plain language, define subsystem-specific jargon the first time you need it, and make the causal story obvious. Explicitly classify evidence confidence as `reproduced`, `observed`, or `inferred`: `reproduced` means you reproduced the failure locally; `observed` means Fixer has direct crash/log/trace evidence but you did not independently reproduce it; `inferred` means the source patch is not pull-request-ready, so do not leave a source diff unless you first gather stronger observed/reproduced evidence; otherwise return a no-patch diagnosis/report. For any source-changing `observed` patch, say explicitly in `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. Security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior need reproduced evidence plus explicit security-impact analysis before leaving a source diff; otherwise return a no-patch diagnosis/report for human review. If you introduce non-obvious state translation, index remapping, or backend split logic, add a short source comment that explains the invariant being preserved.
Start by explaining the likely root cause from the collected perf, strace, and /proc evidence. If you cannot land a safe patch, leave a diagnosis that is strong enough for an upstream bug report.
Interpreter process expectation: when the hot process is Python, Perl, shell, Node, Ruby, PHP, Lua, or another interpreter, inspect both the runtime and the script/application entrypoint from `details.interpreter_process`. Prefer the script or application package when evidence points there; do not patch the interpreter runtime merely because the hot binary is `python`, `perl`, `bash`, or similar. Runtime fixes are welcome only after checking the entrypoint and explaining why the runtime mishandles the workload or why running bad code faster/safer is itself the right upstream fix.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Keep the change narrowly scoped and summarize validation clearly.
In every authoring pass, your final response must start with `Subject: <single-line git commit subject>` and then include these markdown sections exactly:
## Commit Message
A short upstream-friendly explanation of what changed and why. Write it in plain language that a maintainer can follow without local complaint context. If you use subsystem jargon, define it immediately.
## Evidence Confidence
Exactly one word: `reproduced`, `observed`, or `inferred`. Use `reproduced` only when you reproduced the failure locally with a command or test, and include that command/test in `## Validation`. Use `observed` when Fixer has direct crash/log/trace evidence but you did not independently reproduce it. If `## Git Add Paths` lists source files for an `observed` patch, `## Issue Connection` must explicitly say the failure was observed by Fixer and not independently reproduced. Security-sensitive source changes touching authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior require reproduced evidence and explicit security-impact analysis; otherwise list `None` under `## Git Add Paths` and write a no-patch diagnosis/report. Use `inferred` for profiler/strace/indirect evidence; inferred responses may be no-patch diagnoses or reports, but inferred source patches are not pull-request-ready until stronger evidence is gathered.
## Issue Connection
Write this as maintainer-facing patch mail, not as local Fixer notes. Cover four things explicitly in readable sentences: the user-visible symptom or the exact collected signal, the code-level cause or the cautious inference from evidence, the specific change you made, and the expected effect. Do not invent a reproducer, command line, crash, or user-visible failure that is not present in the evidence bundle. If the evidence is direct-but-not-reproduced, say it was observed by Fixer and not independently reproduced. If the evidence is indirect and you did not gather stronger evidence, do not leave a source diff; write a no-patch diagnosis/report instead. Include an explicit effect sentence such as `The expected effect is ...`, `This should reduce ...`, or `This prevents ...` for source patches. If the logic is non-obvious in code, mention that you added a short explanatory comment.
## Git Add Paths
List the repo-relative paths that belong in the final patch, one per line. Use `None` only when you intentionally made no source changes. Include intentionally new files, and do not list generated build artifacts.
## Validation
List the checks you ran, or say clearly that you could not run them. Include the independent reproduction command/test and result when `## Evidence Confidence` is `reproduced`; if reproduction was attempted but blocked, name the exact blocker and keep confidence at `observed` or `inferred`.
Before editing, read the plan at `./plan-output.txt` and follow it unless the code proves part of it wrong. If you change course, say so explicitly in the final write-up instead of silently drifting from the plan.
## Review Pass 1
You are reviewing a freshly generated fixer patch.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Review the first patch pass. The original pre-edit snapshot is available at `./source` for diffing.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout. The latest author response is at `./patch-output.txt`. Inspect the current code and changed paths like a strict code reviewer. Focus on correctness, regressions, maintainability, awkward control flow such as avoidable `goto`, missing validation, weak or non-gittable commit message text, and explanations that fail to connect the observed issue evidence to the code change. Also review the maintainer experience: the patch mail should be easy to accept upstream, the user-visible bug should be explained in plain language, subsystem-specific jargon should be defined when first used, and any non-obvious state translation or index remapping in code should have a short explanatory comment. Reject patches that omit `## Evidence Confidence`, use anything other than `reproduced`, `observed`, or `inferred`, or sound more certain than that evidence level allows. Reject patches that claim `reproduced` unless `## Validation` names the concrete reproduction command or test and its result. Reject source patches in security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior unless the author reproduced the behavior and explicitly analyzed the security impact of the change; observed-only evidence should become a diagnosis/report, not a PR-ready source diff. Reject patches that invent a reproducer, command line, crash, or user-visible failure not present in the evidence bundle; indirect profiler or strace evidence may justify a cautious mitigation, but the author must say it is indirect instead of presenting it as a confirmed upstream bug. Reject patches that introduce generic libc/std APIs when nearby code or project docs provide a local compat/helper API for the same job, unless the author explicitly justifies the exception. Reject validation that only reports a leaf object/syntax build when a project-level configure/build/test entrypoint exists and was not attempted; if a full build cannot run, the author must show the exact failed command and blocker.
Do not apply code changes in this pass.
Return a short markdown review report. The first non-empty line must be exactly one of:
RESULT: ok
RESULT: fix-needed
If you choose `RESULT: fix-needed`, add a `## Findings` section with concrete, actionable items.## Plan Pass
## Problem
Fixer observed `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` in a poll-family syscall path, but the retained `strace` excerpt shows `pselect6` timing out after about 1.8s and 2.0s, with process state `S (sleeping)` and only 0.9% CPU. That looks like an idle listener wait more than a proven busy loop.
## Evidence Confidence
observed
## Proposed Subject
No source patch yet: diagnose the `munin-node` idle wait evidence and require a Perl-level stack or local reproduction before changing upstream Munin code.
## Patch Plan
Do not edit in this pass. Inspecting the script entrypoint first found `script/munin-node` delegates the top-level listener to `Munin::Node::Server->run`, which subclasses `Net::Server::Fork`. `Munin::Node::Server` uses Net::Server hooks plus local helpers such as `Munin::Common::Daemon::emit_sd_notify_message`, `Munin::Common::Timeout::do_with_timeout`, `Munin::Common::Logger`, and `Munin::Node::OS->run_as_child` for plugin execution.
No relevant prior Fixer patch was found. Existing Debian patches are unrelated to the node listener loop. If later evidence proves a Munin-side loop, the patch should follow `HACKING.pod`: strict/warnings, English variable names where practical, one statement per line, file-local style, and bounded control flow without avoidable `goto`.
At present, the maintainer-facing report should explain that the observed syscall pattern is consistent with `Net::Server::Fork` waiting up to two seconds in its accept loop, not a confirmed runaway Munin loop.
## Risks
A source patch from the current bundle would risk changing normal daemon accept-loop behavior without a confirmed bug. Timing/throttling behavior is involved, so any change would need a reproducible before/after signal and a clear impact analysis. Runtime Perl should remain a secondary target unless stronger evidence proves Perl itself mishandles the workload.
## Validation
Before any focused check, try the project-level entrypoint from the workspace root: `make`. `make check` is not advertised by this Makefile; if unavailable, use the project test target `make test`.
For a bounded independent reproduction attempt, after `make` generates files, run `munin-node` foreground with a temporary minimal config and trace only wait syscalls, e.g. `timeout 8s strace -ttT -f -e trace=pselect6,select,poll,ppoll,epoll_wait,nanosleep,clock_nanosleep perl -Ilib -wT script/munin-node --foreground --config /tmp/munin-node-test.conf`. Only claim reproduction if this shows repeated immediate wakeups or sustained CPU; otherwise report the evidence as observed by Fixer but not independently reproduced.
## Patch Pass
Subject: Diagnose munin-node idle select evidence
## Commit Message
No source change. The collected evidence points at `munin-node` being sampled while idle in its listener wait path, not at a confirmed Munin busy loop. Because this is timing behavior and the failure could not be reproduced locally, a source patch would be speculative rather than upstream-ready.
## Evidence Confidence
observed
## Issue Connection
Fixer observed `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` with native backtraces under Perl’s `select` path and repeated `pselect6` syscalls. The same evidence also shows the process in `S (sleeping)`, `wchan` at `poll_schedule_timeout`, CPU around 0.9%, and `pselect6` calls blocking for about two seconds, so the collected signal is consistent with an idle event-loop wait rather than a proven runaway loop.
The script entrypoint is `script/munin-node`; it delegates the listener to `Munin::Node::Server`, which subclasses `Net::Server::Fork`. The relevant runtime accept path is `Net::Server::Fork` using `IO::Select->can_read(2)`. Local Munin helpers in this area include `Munin::Common::Daemon::emit_sd_notify_message`, `Munin::Common::Timeout::do_with_timeout`, `Munin::Common::Logger`, and `Munin::Node::OS->run_as_child`; no Munin-specific wrapper exists for the top-level Net::Server listener wait.
I followed the saved plan and made no source changes. The expected effect is that Munin avoids an unjustified timing/throttling change until a Perl-level stack or reproducible local trace ties a real busy wakeup to Munin code.
## Git Add Paths
None
## Validation
`make` from the workspace root failed before building: `/usr/bin/perl Build.PL --destdir="" --installdirs="site" --verbose` could not load `Module/Build.pm`.
`make check` failed because there is no `check` target.
`make test` failed for the same `Module/Build.pm` blocker as `make`.
Focused syntax checks:
`perl -T -Ilib -c script/munin-node` passed.
`perl -Ilib -c lib/Munin/Node/Server.pm` passed.
`perl -Ilib -c lib/Munin/Node/OS.pm` passed, with existing redefinition warnings.
Independent reproduction attempt:
`strace -ttT -f -e trace=pselect6,select,poll,ppoll,epoll_wait,nanosleep,clock_nanosleep ... munin-node --foreground ...` was blocked by sandbox ptrace restrictions: `PTRACE_TRACEME: Operation not permitted`.
A non-ptrace foreground smoke run with a temporary `/tmp` config was also blocked by sandbox networking: Net::Server logged `Cannot bind and listen to TCP port 24949 on 127.0.0.1 [Operation not permitted]`.
Worktree remained clean; no patch was left.
## Review Pass 1
RESULT: ok
No source diff is present, and the no-patch diagnosis is appropriate for the evidence level. The author inspected the Perl entrypoint before considering runtime changes, identified the relevant `Net::Server::Fork` listener path and Munin helpers, avoided a speculative timing/throttling patch, and reported project-level validation attempts with exact blockers. Evidence confidence is valid and not overstated.perl likely remains stuck in a busy-poll loop. A diagnosis report and patch proposal were created locally.
## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround. Inspect the relevant code, nearby callers, project contribution docs, and local helper/compat APIs, but do not edit files in this pass.
Return a short markdown plan with these exact sections:
## Problem
## Evidence Confidence
## Proposed Subject
## Patch Plan
## Risks
## Validation
Classify `## Evidence Confidence` as exactly one of `reproduced`, `observed`, or `inferred`. Use `inferred` only for a no-patch diagnosis/report plan unless you can name the extra evidence you will collect before editing; inferred source patches are blocked by Fixer because they are not pull-request-ready. For `observed` source-patch plans, plan to say in the final `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. If the plan touches authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior, treat it as security-sensitive: do not plan a source patch unless validation can reproduce the behavior and analyze the security impact; otherwise plan a no-patch diagnosis/report. The plan must explain how the proposed code change addresses the observed issue evidence, call out any prior Fixer patch that should be improved or replaced, reject awkward control flow such as avoidable `goto` if there is a cleaner bounded alternative, name any local helper APIs or maintainer conventions the patch should follow, and keep the intended maintainer-facing explanation clear enough that someone unfamiliar with the local complaint wording can still follow the fix. In `## Validation`, name the reproducible configure/build/test entrypoint you will try from the workspace root before any focused leaf compile or smoke check, and include one bounded independent reproduction attempt for the collected failure signal when it is safe and cheap. Do not plan to claim `reproduced` unless that reproduction command or test can actually show the failure.
## Patch Pass
You are working on a bounded fixer proposal.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Produce the smallest reasonable patch for the target repository, keep the change upstreamable, prefer the clearest control flow available, and do not keep avoidable `goto` when a simpler structure would read better. Before introducing new file, process, allocation, locking, networking, or platform APIs, inspect nearby code and project contribution docs for existing helpers or compatibility wrappers and use those local patterns unless you can explain why they do not fit. Validate from a reproducible workspace-root entrypoint before falling back to focused leaf commands; if a build or test cannot run, report the exact command, the exact blocker, and any narrower check you ran instead. During validation, also try one bounded independent reproduction of the collected failure signal when it is safe and cheap, such as a failing test, smoke command, perf/strace comparison, or before/after runtime check. Only use `reproduced` if that command or test actually reproduced the failure; otherwise keep `observed` and report the reproduction blocker. The final explanation must connect the observed issue evidence to the actual code change, not just paraphrase the diff. Write like a maintainer is going to read the patch mail cold: explain the bug in plain language, define subsystem-specific jargon the first time you need it, and make the causal story obvious. Explicitly classify evidence confidence as `reproduced`, `observed`, or `inferred`: `reproduced` means you reproduced the failure locally; `observed` means Fixer has direct crash/log/trace evidence but you did not independently reproduce it; `inferred` means the source patch is not pull-request-ready, so do not leave a source diff unless you first gather stronger observed/reproduced evidence; otherwise return a no-patch diagnosis/report. For any source-changing `observed` patch, say explicitly in `## Issue Connection` that the failure was observed by Fixer and not independently reproduced. Security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior need reproduced evidence plus explicit security-impact analysis before leaving a source diff; otherwise return a no-patch diagnosis/report for human review. If you introduce non-obvious state translation, index remapping, or backend split logic, add a short source comment that explains the invariant being preserved.
Start by explaining the likely root cause from the collected perf, strace, and /proc evidence. If you cannot land a safe patch, leave a diagnosis that is strong enough for an upstream bug report.
Interpreter process expectation: when the hot process is Python, Perl, shell, Node, Ruby, PHP, Lua, or another interpreter, inspect both the runtime and the script/application entrypoint from `details.interpreter_process`. Prefer the script or application package when evidence points there; do not patch the interpreter runtime merely because the hot binary is `python`, `perl`, `bash`, or similar. Runtime fixes are welcome only after checking the entrypoint and explaining why the runtime mishandles the workload or why running bad code faster/safer is itself the right upstream fix.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Keep the change narrowly scoped and summarize validation clearly.
In every authoring pass, your final response must start with `Subject: <single-line git commit subject>` and then include these markdown sections exactly:
## Commit Message
A short upstream-friendly explanation of what changed and why. Write it in plain language that a maintainer can follow without local complaint context. If you use subsystem jargon, define it immediately.
## Evidence Confidence
Exactly one word: `reproduced`, `observed`, or `inferred`. Use `reproduced` only when you reproduced the failure locally with a command or test, and include that command/test in `## Validation`. Use `observed` when Fixer has direct crash/log/trace evidence but you did not independently reproduce it. If `## Git Add Paths` lists source files for an `observed` patch, `## Issue Connection` must explicitly say the failure was observed by Fixer and not independently reproduced. Security-sensitive source changes touching authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling behavior require reproduced evidence and explicit security-impact analysis; otherwise list `None` under `## Git Add Paths` and write a no-patch diagnosis/report. Use `inferred` for profiler/strace/indirect evidence; inferred responses may be no-patch diagnoses or reports, but inferred source patches are not pull-request-ready until stronger evidence is gathered.
## Issue Connection
Write this as maintainer-facing patch mail, not as local Fixer notes. Cover four things explicitly in readable sentences: the user-visible symptom or the exact collected signal, the code-level cause or the cautious inference from evidence, the specific change you made, and the expected effect. Do not invent a reproducer, command line, crash, or user-visible failure that is not present in the evidence bundle. If the evidence is direct-but-not-reproduced, say it was observed by Fixer and not independently reproduced. If the evidence is indirect and you did not gather stronger evidence, do not leave a source diff; write a no-patch diagnosis/report instead. Include an explicit effect sentence such as `The expected effect is ...`, `This should reduce ...`, or `This prevents ...` for source patches. If the logic is non-obvious in code, mention that you added a short explanatory comment.
## Git Add Paths
List the repo-relative paths that belong in the final patch, one per line. Use `None` only when you intentionally made no source changes. Include intentionally new files, and do not list generated build artifacts.
## Validation
List the checks you ran, or say clearly that you could not run them. Include the independent reproduction command/test and result when `## Evidence Confidence` is `reproduced`; if reproduction was attempted but blocked, name the exact blocker and keep confidence at `observed` or `inferred`.
Before editing, read the plan at `./plan-output.txt` and follow it unless the code proves part of it wrong. If you change course, say so explicitly in the final write-up instead of silently drifting from the plan.
## Review Pass 1
You are reviewing a freshly generated fixer patch.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Review the first patch pass. The original pre-edit snapshot is available at `./source` for diffing.
Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout. The latest author response is at `./patch-output.txt`. Inspect the current code and changed paths like a strict code reviewer. Focus on correctness, regressions, maintainability, awkward control flow such as avoidable `goto`, missing validation, weak or non-gittable commit message text, and explanations that fail to connect the observed issue evidence to the code change. Also review the maintainer experience: the patch mail should be easy to accept upstream, the user-visible bug should be explained in plain language, subsystem-specific jargon should be defined when first used, and any non-obvious state translation or index remapping in code should have a short explanatory comment. Reject patches that omit `## Evidence Confidence`, use anything other than `reproduced`, `observed`, or `inferred`, or sound more certain than that evidence level allows. Reject patches that claim `reproduced` unless `## Validation` names the concrete reproduction command or test and its result. Reject source patches in security-sensitive areas such as authentication, authorization, credentials, cryptography, sandboxing, permissions, and timing/throttling behavior unless the author reproduced the behavior and explicitly analyzed the security impact of the change; observed-only evidence should become a diagnosis/report, not a PR-ready source diff. Reject patches that invent a reproducer, command line, crash, or user-visible failure not present in the evidence bundle; indirect profiler or strace evidence may justify a cautious mitigation, but the author must say it is indirect instead of presenting it as a confirmed upstream bug. Reject patches that introduce generic libc/std APIs when nearby code or project docs provide a local compat/helper API for the same job, unless the author explicitly justifies the exception. Reject validation that only reports a leaf object/syntax build when a project-level configure/build/test entrypoint exists and was not attempted; if a full build cannot run, the author must show the exact failed command and blocker.
Do not apply code changes in this pass.
Return a short markdown review report. The first non-empty line must be exactly one of:
RESULT: ok
RESULT: fix-needed
If you choose `RESULT: fix-needed`, add a `## Findings` section with concrete, actionable items.## Plan Pass
## Problem
Fixer observed `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` in a poll-family syscall path, but the retained `strace` excerpt shows `pselect6` timing out after about 1.8s and 2.0s, with process state `S (sleeping)` and only 0.9% CPU. That looks like an idle listener wait more than a proven busy loop.
## Evidence Confidence
observed
## Proposed Subject
No source patch yet: diagnose the `munin-node` idle wait evidence and require a Perl-level stack or local reproduction before changing upstream Munin code.
## Patch Plan
Do not edit in this pass. Inspecting the script entrypoint first found `script/munin-node` delegates the top-level listener to `Munin::Node::Server->run`, which subclasses `Net::Server::Fork`. `Munin::Node::Server` uses Net::Server hooks plus local helpers such as `Munin::Common::Daemon::emit_sd_notify_message`, `Munin::Common::Timeout::do_with_timeout`, `Munin::Common::Logger`, and `Munin::Node::OS->run_as_child` for plugin execution.
No relevant prior Fixer patch was found. Existing Debian patches are unrelated to the node listener loop. If later evidence proves a Munin-side loop, the patch should follow `HACKING.pod`: strict/warnings, English variable names where practical, one statement per line, file-local style, and bounded control flow without avoidable `goto`.
At present, the maintainer-facing report should explain that the observed syscall pattern is consistent with `Net::Server::Fork` waiting up to two seconds in its accept loop, not a confirmed runaway Munin loop.
## Risks
A source patch from the current bundle would risk changing normal daemon accept-loop behavior without a confirmed bug. Timing/throttling behavior is involved, so any change would need a reproducible before/after signal and a clear impact analysis. Runtime Perl should remain a secondary target unless stronger evidence proves Perl itself mishandles the workload.
## Validation
Before any focused check, try the project-level entrypoint from the workspace root: `make`. `make check` is not advertised by this Makefile; if unavailable, use the project test target `make test`.
For a bounded independent reproduction attempt, after `make` generates files, run `munin-node` foreground with a temporary minimal config and trace only wait syscalls, e.g. `timeout 8s strace -ttT -f -e trace=pselect6,select,poll,ppoll,epoll_wait,nanosleep,clock_nanosleep perl -Ilib -wT script/munin-node --foreground --config /tmp/munin-node-test.conf`. Only claim reproduction if this shows repeated immediate wakeups or sustained CPU; otherwise report the evidence as observed by Fixer but not independently reproduced.
## Patch Pass
Subject: Diagnose munin-node idle select evidence
## Commit Message
No source change. The collected evidence points at `munin-node` being sampled while idle in its listener wait path, not at a confirmed Munin busy loop. Because this is timing behavior and the failure could not be reproduced locally, a source patch would be speculative rather than upstream-ready.
## Evidence Confidence
observed
## Issue Connection
Fixer observed `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` with native backtraces under Perl’s `select` path and repeated `pselect6` syscalls. The same evidence also shows the process in `S (sleeping)`, `wchan` at `poll_schedule_timeout`, CPU around 0.9%, and `pselect6` calls blocking for about two seconds, so the collected signal is consistent with an idle event-loop wait rather than a proven runaway loop.
The script entrypoint is `script/munin-node`; it delegates the listener to `Munin::Node::Server`, which subclasses `Net::Server::Fork`. The relevant runtime accept path is `Net::Server::Fork` using `IO::Select->can_read(2)`. Local Munin helpers in this area include `Munin::Common::Daemon::emit_sd_notify_message`, `Munin::Common::Timeout::do_with_timeout`, `Munin::Common::Logger`, and `Munin::Node::OS->run_as_child`; no Munin-specific wrapper exists for the top-level Net::Server listener wait.
I followed the saved plan and made no source changes. The expected effect is that Munin avoids an unjustified timing/throttling change until a Perl-level stack or reproducible local trace ties a real busy wakeup to Munin code.
## Git Add Paths
None
## Validation
`make` from the workspace root failed before building: `/usr/bin/perl Build.PL --destdir="" --installdirs="site" --verbose` could not load `Module/Build.pm`.
`make check` failed because there is no `check` target.
`make test` failed for the same `Module/Build.pm` blocker as `make`.
Focused syntax checks:
`perl -T -Ilib -c script/munin-node` passed.
`perl -Ilib -c lib/Munin/Node/Server.pm` passed.
`perl -Ilib -c lib/Munin/Node/OS.pm` passed, with existing redefinition warnings.
Independent reproduction attempt:
`strace -ttT -f -e trace=pselect6,select,poll,ppoll,epoll_wait,nanosleep,clock_nanosleep ... munin-node --foreground ...` was blocked by sandbox ptrace restrictions: `PTRACE_TRACEME: Operation not permitted`.
A non-ptrace foreground smoke run with a temporary `/tmp` config was also blocked by sandbox networking: Net::Server logged `Cannot bind and listen to TCP port 24949 on 127.0.0.1 [Operation not permitted]`.
Worktree remained clean; no patch was left.
## Review Pass 1
RESULT: ok
No source diff is present, and the no-patch diagnosis is appropriate for the evidence level. The author inspected the Perl entrypoint before considering runtime changes, identified the relevant `Net::Server::Fork` listener path and Munin helpers, avoided a speculative timing/throttling patch, and reported project-level validation attempts with exact blockers. Evidence confidence is valid and not overstated.