perl likely remains stuck in a busy-poll loop. The diagnosis was captured, but the patch proposal did not complete cleanly.
Published session
Prompt
## 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. For public upstream review, prepare the final patch against the upstream default integration branch, usually `master` or `main`; use installed or stable source trees for reproduction/backport validation, not as the default merge-request base unless the contribution docs explicitly say to target a stable branch. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, branch-base choice, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Codex subagent/fan-out expectation: for any non-trivial investigation, do not keep all checking in the lead context. Proactively spawn bounded leaf subagents for independent source inspection, duplicate/upstream search, implementation sanity checks, and verification while the lead owns integration. Use the newest available mini model for read-only scouts, and use `gpt-5.3-codex-spark` aggressively for tiny coding, test, and verification leaves even when the lead model is `gpt-5.6-luna`. Pass model names explicitly when spawning. Keep subagents as leaves: tell them not to spawn their own agents, not to run recursive `codex review`, not to perform public/external/destructive actions, and not to duplicate the same live-state operation. Merge their evidence into the final patch/report instead of merely saying a subagent looked. 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, timing/throttling behavior, or PostgreSQL database-core behavior such as dynamic library resolution, extension loading, transaction semantics, locking, planner/executor behavior, catalog changes, or storage changes, treat it as high-risk: do not plan a source patch unless validation can reproduce the behavior and analyze the semantic 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. For public upstream review, prepare the final patch against the upstream default integration branch, usually `master` or `main`; use installed or stable source trees for reproduction/backport validation, not as the default merge-request base unless the contribution docs explicitly say to target a stable branch. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, branch-base choice, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `munin` upstream patch, not just a Debian-local workaround.
Codex subagent/fan-out expectation: for any non-trivial investigation, do not keep all checking in the lead context. Proactively spawn bounded leaf subagents for independent source inspection, duplicate/upstream search, implementation sanity checks, and verification while the lead owns integration. Use the newest available mini model for read-only scouts, and use `gpt-5.3-codex-spark` aggressively for tiny coding, test, and verification leaves even when the lead model is `gpt-5.6-luna`. Pass model names explicitly when spawning. Keep subagents as leaves: tell them not to spawn their own agents, not to run recursive `codex review`, not to perform public/external/destructive actions, and not to duplicate the same live-state operation. Merge their evidence into the final patch/report instead of merely saying a subagent looked.
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. PostgreSQL database-core source changes touching dynamic library resolution, extension loading, transaction semantics, locking, planner/executor behavior, catalog changes, or storage changes require reproduced evidence plus explicit semantic-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. For public upstream review, prepare the final patch against the upstream default integration branch, usually `master` or `main`; use installed or stable source trees for reproduction/backport validation, not as the default merge-request base unless the contribution docs explicitly say to target a stable branch. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, branch-base choice, or evidence limit 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.
Codex suba
[truncated 22276 bytes]
Response
## Plan Pass
## Problem
Fixer labels `munin-node` as likely busy-polling, but the captured trace shows `pselect6` blocking for about 1.8–2 seconds per call, with the process sleeping and reported CPU use at 0.9%. This does not establish a Munin or Perl defect.
## Evidence Confidence
inferred — the evidence points to the normal `Net::Server::Fork` listener wait, not a demonstrated spin. Before considering a source patch, collect a bounded repeat of process state and syscall timing, plus a language-level stack or CPU profile if sustained CPU use is observed. Do not claim the issue is reproduced unless that check shows it.
## Proposed Subject
No source patch; diagnose the finding as unconfirmed. The maintainer-facing report should explain that the available trace is consistent with an idle listener and does not identify a cause for the reported CPU concern.
## Patch Plan
No code changes planned. The entrypoint is `script/munin-node`, which starts `Munin::Node::Server`; the observed wait is in the inherited `Net::Server::Fork` loop. `lib/Munin/Node/OS.pm` has a separate `select` for plugin-child pipes, but the captured trace does not implicate it. No prior Fixer patch or relevant local server-loop helper was found. `CONTRIBUTING.md` points to `HACKING.pod`; that guide says bug-fix patches target `stable-2.0`, so use that base only if further evidence justifies a fix.
## Risks
Changing the listener wait based on this evidence could alter normal daemon behavior without addressing the reported concern. The trace’s “busy-poll” classification conflicts with its blocking durations and low CPU report.
## Validation
First try `make` from the workspace root, followed by `make check` only if that target exists; the current `Makefile` defines `test`, not `check`. If the project build fails due to missing dependencies or generated files, record the exact command and failure, then try the narrowest reproducible Perl syntax/test check. Independently, perform a bounded `ps` and syscall-trace check on the affected process; inspect a Perl-level stack/profile only if it shows sustained CPU use. No validation commands have been run in this planning pass.
## Patch Pass
Thanks—this independent review agrees with the diagnosis: the trace fits `Net::Server::Fork`’s blocking listener wait, not a demonstrated Munin or Perl busy loop. No source patch is warranted.
## Review Pass 1
RESULT: fix-needed
## Findings
- `patch-output.txt` is only a conversational sentence. It omits the required `Subject:` line and sections for commit message, evidence confidence, issue connection, git-add paths, and validation.
- It does not state a confidence level. Given the indirect profile/trace and lack of independent reproduction, report `inferred`.
- It omits the validation record: `make` failed because `Module::Build` is missing, `make check` is not defined, the Perl syntax check passed, and the bounded reproduction attempt found no live `munin-node` process.
- Replace it with a maintainer-facing no-patch diagnosis explaining that timed-out `pselect6` calls, sleeping process state, and 0.9% CPU are consistent with the inherited `Net::Server::Fork` listener wait—not evidence of a Munin busy loop. Include the `script/munin-node` → `Munin::Node::Server` path, distinguish the unrelated `Munin::Node::OS` `select`, and list `None` under `## Git Add Paths`.
- The workspace diff is empty, which is appropriate for this inferred diagnosis; no source patch is justified by the evidence.
## Refinement Pass 1
Subject: Diagnose unconfirmed munin-node busy-poll report
## Commit Message
No source changes. The captured evidence does not establish a Munin or Perl busy loop, so a source patch would be speculative.
## Evidence Confidence
inferred
## Issue Connection
The collected signal is three `pselect6` calls timing out after roughly 1.8–2 seconds, with `/proc` reporting a sleeping process and a `poll_schedule_timeout` wait channel; the profile’s `perf_ctx_enable` hotspot alone does not establish application CPU use. The cautious inference is that `script/munin-node` starts `Munin::Node::Server`, which inherits its listener wait from `Net::Server::Fork`; the separate `select` in `Munin::Node::OS` is for plugin-child pipes and is not implicated. No source change is made because the evidence does not identify a code defect. The expected effect is to avoid an unsupported fix until stronger evidence ties sustained CPU use to Munin or Perl code.
## Git Add Paths
None
## Validation
- `make` failed: `Build.PL` could not locate `Module/Build.pm` and `make` exited with error 2.
- `make check` is unavailable; the `Makefile` defines no `check` target.
- `perl -T -Ilib -c script/munin-node` passed with `syntax OK`.
- Independent reproduction was blocked: `pgrep -a -f '[m]unin-node'` found no live target process to inspect or trace.
- `HACKING.pod` says bug-fix patches target `stable-2.0`; no patch or merge-request base is applicable. No relevant local helper for the inherited listener wait was found.
## Review Pass 2
RESULT: fix-needed
## Findings
- `refine-1-output.txt` overstates the trace by saying all three `pselect6` calls timed out. The first two show timeout returns and durations; the third excerpt is truncated after the timeout argument. Revise the sentence to say three calls were captured, the first two timed out, and the third is incomplete in the evidence.
- The remaining report requirements are satisfied. The workspace contains no source diff, appropriately avoiding a speculative patch based on indirect evidence.
## Refinement Pass 2
## Workflow Note
{"type":"item.completed","item":{"id":"item_2","type":"agent_message","text":"I’ll reread the refinement, review, and plan, then confirm the current patch state."}}
{"type":"error","message":"Reconnecting... 1/5 (stream disconnected before completion: Upstream websocket closed before response.completed: Upstream websocket receive failed)"}
{"type":"error","message":"Reconnecting... 2/5 (unexpected status 503 Service Unavailable: opportunistic burn window closed: no expendable account has emergency foreground reserve, url: http://127.0.0.1:2455/backend-api/codex/responses, request id: 6221f7f0-2a64-4949-aa68-7d35005bb917)"}
{"type":"error","message":"Reconnecting... 3/5 (unexpected status 503 Service Unavailable: opportunistic burn window closed: no expendable account has emergency foreground reserve, url: http://127.0.0.1:2455/backend-api/codex/responses, request id: dc369ee2-e8ca-48c3-ab0a-adca5c2a1900)"}
{"type":"error","message":"Reconnecting... 4/5 (unexpected status 503 Service Unavailable: opportunistic burn window closed: no expendable account has emergency foreground reserve, url: http://127.0.0.1:2455/backend-api/codex/responses, request id: 7509250b-4162-4b4d-8ccb-f2f911334c42)"}
{"type":"error","message":"Reconnecting... 5/5 (unexpected status 503 Service Unavailable: opportunistic burn window closed: no expendable account has emergency foreground reserve, url: http://127.0.0.1:2455/backend-api/codex/responses, request id: 85127c37-76c2-4ee8-8d31-811ea03a4a29)"}
{"type":"error","message":"unexpected status 503 Service Unavailable: opportunistic burn window closed: no expendable account has emergency foreground reserve, url: http://127.0.0.1:2455/backend-api/codex/responses, request id: ccaf91c0-288f-45ba-bdfe-5588e068c7d1"}
{"type":"turn.failed","error":{"message":"unexpected status 503 Service Unavailable: opportunistic burn window closed: no expendable account has emergency foreground reserve, url: http://127.0.0.1:2455/backend-api/codex/responses, request id: ccaf91c0-288f-45ba-bdfe-5588e068c7d1"}}