Diagnosis-only reports

6.30% of sampled CPU in ollama went through unresolved offset (/usr/local/bin/ollama)

## 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 `local-executable-upstream-git`. The original pre-edit snapshot is available at `./source` if you need to inspect it.

Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `cmake -S . -B build-fix -G Ninja && cmake --build build-fix && ctest --test-dir build-fix --output-on-failure`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has 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 `github.com_ollama_ollama` 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, 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 `local-executable-upstream-git`. 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.

Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `cmake -S . -B build-fix -G Ninja && cmake --build build-fix && ctest --test-dir build-fix --output-on-failure`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has 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 `github.com_ollama_ollama` 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. 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 `local-executable-upstream-git`. 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 `github.com_ollama_ollama` 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): `cmake -S . -B build-fix -G Ninja && cmake --build build-fix && ctest --test-dir build-fix --output-on-failure`. If the project-level command fails because dependencies or generated files are missing, 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 a 3-second `perf` profile where 11.75% of sampled CPU in `/usr/local/bin/ollama` landed in unresolved instruction offsets around `0x18a4870-0x18a4890`. The installed binary is stripped, `go tool addr2line` could not resolve those offsets, and the evidence bundle does not identify a Go package, C/C++ function, workload, model, request shape, or user-visible regression.

## Evidence Confidence

observed

## Proposed Subject

No source patch yet: diagnose unresolved perf hotspot before editing.

## Patch Plan

Do not prepare a source change from the current evidence alone. The maintainer-facing report should state that Fixer observed a hot instruction range in a stripped local executable, not a confirmed source-level bug.

Before any future patch, collect enough source attribution to make it reviewable: rerun or reprocess profiling with symbols/debug info, map the hot offsets to the ggml/Ollama source function, identify the model/workload that produced the profile, and compare against upstream `main`. The workspace branch is `master` with a synthetic `Fixer baseline`, while the retained upstream source is on `main`; any eventual upstream patch should target upstream `main`.

I found no prior Fixer patch to improve or replace. Since no touched subsystem can be named from the evidence, no subsystem-local helper applies yet. General conventions found: `CONTRIBUTING.md` asks for `<package>: <short description>` commit titles and behavior-focused tests; `docs/development.md` names `go test ./...` for tests, while the detected native build entrypoint is CMake/Ninja. Local wrappers/helpers observed include `logutil.NewLogger`/`logutil.Trace` for logging and the `fs` package for GGUF/config parsing, but none is relevant until the hotspot is attributed.

## Risks

A source patch would be speculative: the disassembly suggests a tight native numeric loop over 16-bit values and float lookup/multiply/add, likely in vendored/native inference code, but the symbol shown by `objdump` is not reliable source attribution for a stripped PIE binary. Optimizing or changing that path without workload reproduction risks harming model correctness, backend portability, or CPU/GPU performance.

## Validation

First try the project-level command from the workspace root:

```sh
cmake -S . -B build-fix -G Ninja && cmake --build build-fix && ctest --test-dir build-fix --output-on-failure
```

If that fails because optional native dependencies or generated files are unavailable, record the exact failure and then run the narrowest reproducible checks for the diagnosed subsystem, likely `go test ./...` plus targeted native compile/tests once the symbol is known.

Bounded independent evidence step before editing: run `perf report --stdio -i /var/lib/fixer/perf/2026-05-27T13-59-53.855162230+00-00-ollama.data --no-children` and symbolization attempts such as `go tool addr2line /usr/local/bin/ollama` and `objdump -d --start-address=0x18a4850 --stop-address=0x18a48b0 /usr/local/bin/ollama`. This can confirm the unresolved-offset signal, but it cannot independently reproduce the CPU hotspot without the original workload/model.

## Patch Pass

Subject: perf-hotspot: report unresolved ollama offset

## Commit Message
No source change was made. The evidence is a profiler-only hotspot in a stripped installed `ollama` binary, and the hot offset could not be mapped to a source function. A patch would be speculative until the workload and symbolized source location are known.

## Evidence Confidence
inferred

## Issue Connection
The collected signal is a 3-second `perf` sample showing 11.75% of CPU in `/usr/local/bin/ollama` at an unresolved offset. Reprocessing the profile confirmed hot instruction offsets around `0x18a4870-0x18a4890`, but `go tool addr2line` returned `?:0` and the binary is stripped.

The cautious inference is that the hot code is a native numeric loop, but the code-level cause is not attributable to a reviewable Ollama or ggml source function from this evidence. Following the saved plan, I did not leave a source diff. The expected effect is to avoid an upstream patch that changes inference behavior or performance without a reproducible workload and symbolized source location.

I checked `CONTRIBUTING.md` and `docs/development.md`: upstream commit subjects should use `<package>: <short description>`, tests should prefer behavior coverage, and `go test ./...` is the documented Go test entrypoint. The retained upstream repository is on `main`; this workspace is a synthetic `master` baseline, so any eventual patch should target upstream `main`. No relevant local helper API was found because no source subsystem could be safely identified.

## Git Add Paths
None

## Validation
Project-level command attempted:

```sh
cmake -S . -B build-fix -G Ninja && cmake --build build-fix && ctest --test-dir build-fix --output-on-failure
```

It failed during CMake configure: `Could NOT find Vulkan (missing: glslc) (found version "1.4.341")`.

Fallback checks attempted:

```sh
go test ./...
```

This first failed because `/root/.cache/go-build` is read-only. With writable caches:

```sh
GOCACHE=/tmp/ollama-gocache GOMODCACHE=/tmp/ollama-gomodcache go test ./...
```

The full suite still failed because dependencies could not be fetched under restricted networking, for example `Get "https://proxy.golang.org/...": dial udp 127.0.0.53:53: socket: operation not permitted`. Some cached packages did run; `cmd/internal/fileutil` tests also failed in this environment.

Collected-signal checks:

```sh
perf report --stdio -i /var/lib/fixer/perf/2026-05-27T13-59-53.855162230+00-00-ollama.data --no-children --sort comm,dso,symbol
printf '0x18a4890\n0x18a488c\n0x18a487d\n0x18a4870\n0x1832298\n' | go tool addr2line /usr/local/bin/ollama
objdump -d --start-address=0x18a4850 --stop-address=0x18a48b0 /usr/local/bin/ollama
```

These confirmed the unresolved-offset profile and failed source symbolization.

Bounded independent reproduction attempted:

```sh
perf record -o /tmp/ollama-help.data -- /usr/local/bin/ollama --help
```

That produced `zero-sized data`, so it did not reproduce the hotspot. The reproduction blocker is that the evidence bundle does not include the original model/workload/request that drove the sampled CPU.

## Review Pass 1

RESULT: ok

No source diff is present in the workspace, which matches the author’s no-patch diagnosis.

The response correctly classifies the evidence as `inferred` for profiler-only unresolved-offset data, avoids inventing a reproducer or user-visible failure, and does not leave a speculative source patch. It also documents the contribution/test conventions, upstream `main` branch base, lack of relevant local helper because no subsystem was attributable, and the evidence limit.

Validation is acceptable for a no-patch report: the project-level CMake/Ninja/CTest entrypoint was attempted with the exact Vulkan `glslc` blocker, fallback `go test ./...` attempts and environment blockers were reported, and a bounded independent perf smoke attempt was included without claiming reproduction.

## Plan Pass

## Problem

Fixer observed a 3-second `perf` profile where 11.75% of sampled CPU in `/usr/local/bin/ollama` landed in unresolved instruction offsets around `0x18a4870-0x18a4890`. The installed binary is stripped, `go tool addr2line` could not resolve those offsets, and the evidence bundle does not identify a Go package, C/C++ function, workload, model, request shape, or user-visible regression.

## Evidence Confidence

observed

## Proposed Subject

No source patch yet: diagnose unresolved perf hotspot before editing.

## Patch Plan

Do not prepare a source change from the current evidence alone. The maintainer-facing report should state that Fixer observed a hot instruction range in a stripped local executable, not a confirmed source-level bug.

Before any future patch, collect enough source attribution to make it reviewable: rerun or reprocess profiling with symbols/debug info, map the hot offsets to the ggml/Ollama source function, identify the model/workload that produced the profile, and compare against upstream `main`. The workspace branch is `master` with a synthetic `Fixer baseline`, while the retained upstream source is on `main`; any eventual upstream patch should target upstream `main`.

I found no prior Fixer patch to improve or replace. Since no touched subsystem can be named from the evidence, no subsystem-local helper applies yet. General conventions found: `CONTRIBUTING.md` asks for `<package>: <short description>` commit titles and behavior-focused tests; `docs/development.md` names `go test ./...` for tests, while the detected native build entrypoint is CMake/Ninja. Local wrappers/helpers observed include `logutil.NewLogger`/`logutil.Trace` for logging and the `fs` package for GGUF/config parsing, but none is relevant until the hotspot is attributed.

## Risks

A source patch would be speculative: the disassembly suggests a tight native numeric loop over 16-bit values and float lookup/multiply/add, likely in vendored/native inference code, but the symbol shown by `objdump` is not reliable source attribution for a stripped PIE binary. Optimizing or changing that path without workload reproduction risks harming model correctness, backend portability, or CPU/GPU performance.

## Validation

First try the project-level command from the workspace root:

```sh
cmake -S . -B build-fix -G Ninja && cmake --build build-fix && ctest --te

[truncated]

Issue page: /issues/019dda2b-7ba9-7dc0-86a1-9022cc1b6766. Issue JSON: /v1/issues/019dda2b-7ba9-7dc0-86a1-9022cc1b6766

5.85% of sampled CPU in postgres went through polygonize_noded_linked_polygon (/home/<user>/proj/osgeo/h3-pg/build/h3_postgis/h3_postgis.so)

## 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 `local-artifact-repo`. The original pre-edit snapshot is available at `./source` if you need to inspect it.

Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `cmake -S . -B build-fix -G Ninja && cmake --build build-fix && ctest --test-dir build-fix --output-on-failure`, `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has 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 `h3-pg` 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, 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 `local-artifact-repo`. 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.

Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `cmake -S . -B build-fix -G Ninja && cmake --build build-fix && ctest --test-dir build-fix --output-on-failure`, `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has 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 `h3-pg` 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. 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 `local-artifact-repo`. Review the first patch pass. The original pre-edit snapshot is available at `./source` for diffing. The workspace currently changes these repo-relative paths: h3_postgis/src/wkb_regions.c. Verify that `## Git Add Paths` matches this exact set and that `## Issue Connection` explains every shipped functional file.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has 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 `h3-pg` 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): `cmake -S . -B build-fix -G Ninja && cmake --build build-fix && ctest --test-dir build-fix --output-on-failure`, `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, 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 thi

[truncated 225 bytes]

## Plan Pass

## Problem
Fixer observed CPU time in `postgres` under `h3_postgis.so`, with `polygonize_noded_linked_polygon` accounting for 5.85% of sampled cycles. The evidence is profiler-only: no SQL reproducer or user-visible failure is provided.

## Evidence Confidence
observed

## Proposed Subject
`h3_postgis: avoid unnecessary noded polygon segment intersection work`

## Patch Plan
Patch against upstream `main` semantics; the prepared workspace is a Fixer `master` baseline, but the source repo tracks `origin/main`.

Focus on `h3_postgis/src/wkb_regions.c`, where `polygonize_noded_linked_polygon()` builds a noded `VertexGraph`. The local conventions are PostgreSQL memory APIs (`palloc`, `repalloc`, `pfree`) and H3 vertex-graph helpers (`initVertexGraph`, `findNodeForEdge`, `addVertexNode`, `removeVertexNode`), so the patch should stay within those.

Add cached per-segment min/max lat/lng bounds to `NodedSegment`, initialize them in `collect_linked_polygon_segments()`, and add a small bounded helper to reject segment pairs whose bounding boxes cannot intersect before calling `segment_intersection_t()` or `segment_collinear_overlap_ts()`. This directly reduces work in the observed hot polygonizer path without changing graph topology for candidate pairs.

Avoid awkward control flow such as `goto`; a simple helper plus `continue` in the existing nested loop is enough.

Add focused regression coverage only if a query can be tied to an existing low-zoom/tile polygonization case. Otherwise rely on existing `h3_postgis/test/sql/postgis.sql` and `tile_coverage.sql` coverage, because the evidence is performance-only and inventing a correctness failure would be misleading.

Prior patch context: upstream commit `e98791f` introduced/simplified the large h3_postgis tile coverage polygonization path. This plan improves that path’s cost profile rather than replacing the topology fallback. I found no prior Fixer patch to replace, apart from the synthetic Fixer baseline commit.

## Risks
This is geometry/topology-sensitive code. The planned change should be low semantic risk because it only skips segment-pair math when expanded bounding boxes prove the pair cannot intersect, but bad epsilon handling could drop near-touching split vertices. Use `DBL_EPSILON` consistently with nearby helpers and keep the condition conservative.

The profiler sample does not prove this exact inner loop is the only cost inside `polygonize_noded_linked_polygon`; final reporting must say the issue was observed by Fixer and not independently reproduced unless a local perf run shows the same symbol.

## Validation
First try the project-level entrypoint from the workspace root:

```sh
cmake -S . -B build-fix -G Ninja && cmake --build build-fix && ctest --test-dir build-fix --output-on-failure
```

If that fails due to missing dependencies or generated files, report the exact command and failure, then run the narrowest reproducible build/test such as:

```sh
cmake --build build-fix --target postgresql_h3_postgis
ctest --test-dir build-fix -R '^h3_postgis_regress_fast$' --output-on-failure
```

Bounded independent performance attempt, if the build/test environment supports `perf`:

```sh
perf record -g -o /tmp/h3-pg-polygonize.data -- ctest --test-dir build-fix -R '^h3_postgis_regress$' --output-on-failure
perf report --stdio --no-children -i /tmp/h3-pg-polygonize.data | rg 'polygonize_noded_linked_polygon'
```

Do not claim `reproduced` unless that local perf command shows the hotspot.

## Patch Pass

Subject: h3_postgis: skip disjoint segment checks while polygonizing

## Commit Message
`polygonize_noded_linked_polygon` builds a noded boundary graph, meaning boundary segments are split wherever they cross before faces are rebuilt. The graph builder compared every segment pair with full intersection math, even when their latitude/longitude ranges could not overlap.

Cache conservative bounds on each `NodedSegment` and skip impossible segment pairs before the existing intersection and collinear-overlap checks. This follows the saved plan, the local PostgreSQL allocation conventions (`palloc`/`pfree`) and H3 `VertexGraph` helper flow, and is intended for upstream `main` rather than a Debian-local workaround.

## Evidence Confidence
observed

## Issue Connection
Fixer observed a perf trace where `postgres` spent 5.85% of sampled CPU in `h3_postgis.so` under `polygonize_noded_linked_polygon`. This was observed by Fixer and not independently reproduced; the evidence is profiler-only, with no SQL reproducer or user-visible failure.

The cautious code-level inference is that the noded polygonizer can spend avoidable time in its all-pairs segment loop. Before this patch, `graph_add_noded_linked_polygon_edges()` called the detailed crossing and collinear-overlap routines for every pair of boundary segments, including pairs whose bounding boxes are disjoint.

The change adds cached min/max latitude and longitude bounds to each `NodedSegment`, plus a conservative `segments_bounds_overlap()` guard before the detailed pair checks. I added a short comment documenting the invariant: the reject must remain conservative because missed overlaps would drop graph nodes.

The expected effect is to reduce CPU spent in the observed polygonizer path for large split-boundary inputs while preserving the existing topology behavior for any segment pair that could actually overlap.

## Git Add Paths
h3_postgis/src/wkb_regions.c

## Validation
Ran the requested project-level entrypoint first:

```sh
cmake -S . -B build-fix -G Ninja && cmake --build build-fix && ctest --test-dir build-fix --output-on-failure
```

It failed during configure because CMake `FetchContent` could not download H3 core from GitHub: `Could not resolve host: github.com`.

Used the retained local H3 source cache only as a dependency cache, not as the patch base:

```sh
cmake -S . -B build-fix-local -G Ninja -DFETCHCONTENT_SOURCE_DIR_H3=./source/build/_deps/h3-src && cmake --build build-fix-local && ctest --test-dir build-fix-local --output-on-failure
```

Configure and build completed, including `h3_postgis/src/wkb_regions.c`. CTest failed because PostgreSQL regression tests need `initdb`, and this sandbox runs as root: `initdb: error: cannot be run as root`.

Focused checks:

```sh
cmake --build build-fix-local --target postgresql_h3_postgis
```

Passed (`ninja: no work to do` after the successful full build).

```sh
ctest --test-dir build-fix-local -R '^h3_postgis_regress_fast$' --output-on-failure
```

Failed for the same `initdb: error: cannot be run as root` blocker.

```sh
git diff --check
```

Passed.

Bounded independent perf reproduction attempt:

```sh
perf record -g -o /tmp/h3-pg-polygonize.data -- ctest --test-dir build-fix-local -R '^h3_postgis_regress_fast$' --output-on-failure
```

Blocked before running the workload: `perf_event_paranoid` is `3`, and the sandbox lacks `CAP_PERFMON`, `CAP_SYS_PTRACE`, or `CAP_SYS_ADMIN`. I also inspected the supplied perf data, which shows the collected signal, but that is not an independent reproduction.

## Review Pass 1

RESULT: ok

No blocking findings.

`## Git Add Paths` matches the current changed path exactly: `h3_postgis/src/wkb_regions.c`.

The patch is narrowly scoped and the `## Issue Connection` explains the shipped functional change: cached segment bounds in the noded polygonizer and a conservative overlap guard before detailed segment intersection work. It also correctly avoids claiming a reproduced bug, states the profiler-only evidence limit, and says the Fixer signal was not independently reproduced.

Validation reporting is acceptable: the project-level CMake/Ninja/CTest command was attempted first and failed on GitHub DNS during `FetchContent`; the alternate build completed using the retained H3 source cache; PostgreSQL regression tests were blocked by `initdb: error: cannot be run as root`; and the independent perf attempt was blocked by `perf_event_paranoid=3`.

## Plan Pass

## Problem
Fixer observed CPU time in `postgres` under `h3_postgis.so`, with `polygonize_noded_linked_polygon` accounting for 5.85% of sampled cycles. The evidence is profiler-only: no SQL reproducer or user-visible failure is provided.

## Evidence Confidence
observed

## Proposed Subject
`h3_postgis: avoid unnecessary noded polygon segment intersection work`

## Patch Plan
Patch against upstream `main` semantics; the prepared workspace is a Fixer `master` baseline, but the source repo tracks `origin/main`.

Focus on `h3_postgis/src/wkb_regions.c`, where `polygonize_noded_linked_polygon()` builds a noded `VertexGraph`. The local conventions are PostgreSQL memory APIs (`palloc`, `repalloc`, `pfree`) and H3 vertex-graph helpers (`initVertexGraph`, `findNodeForEdge`, `addVertexNode`, `removeVertexNode`), so the patch should stay within those.

Add cached per-segment min/max lat/lng bounds to `NodedSegment`, initialize them in `collect_linked_polygon_segments()`, and add a small bounded helper to reject segment pairs whose bounding boxes cannot intersect before calling `segment_intersection_t()` or `segment_collinear_overlap_ts()`. This directly reduces work in the observed hot polygonizer path without changing graph topology for candidate pairs.

Avoid awkward control flow such as `goto`; a simple helper plus `continue` in the existing nested loop is enough.

Add focused regression coverage only if a query can be tied to an existing low-zoom/tile polygonization case. Otherwise rely on existing `h3_postgis/test/sql/postgis.sql` and `tile_coverage.sql` coverage, because the evidence is performance-only and inventing a correctness failure would be misleading.

Prior patch context: upstream commit `e98791f` introduced/simplified the large h3_postgis tile coverage polygonization path. This plan improves that path’s cost profile rather than replacing the topology fallback. I found no prior Fixer patch to replace, apart from the synthetic Fixer baseline commit.

## Risks
This is geometry/topology-sensitive code. The planned change should be low semantic risk because it only skips segment-pair math when expanded bounding boxes prove the pair cannot intersect, but bad epsilon handling could drop near-touching split vertices. Use `DBL_EPSILON` consistently with nearby helpers and keep the condition conservative.

The profiler sample does not prove this e

[truncated]

Issue page: /issues/019e6e8e-eb95-78e1-8a7a-559701878977. Issue JSON: /v1/issues/019e6e8e-eb95-78e1-8a7a-559701878977

Top frame: __pthread_kill_implementation [libc.so.6]

## 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 `local-artifact-repo`. The original pre-edit snapshot is available at `./source` if you need to inspect it.

Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `autoreconf -fi && ./configure && make`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has 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 `openssh-syslog-pr666` 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, 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 `local-artifact-repo`. 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.

Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `autoreconf -fi && ./configure && make`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has 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 `openssh-syslog-pr666` 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. 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 `local-artifact-repo`. 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 `openssh-syslog-pr666` 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): `./configure && make`, `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, 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 `regress/unittests/misc/test_misc` aborting in `test_syslog_kept_open_between_messages`. The failure signal points at the new syslog lifecycle coverage for `log.c`, likely around the non-`openlog_r` path closing/reopening syslog between messages instead of keeping the connection open.

## Evidence Confidence
observed

## Proposed Subject
`log: keep syslog open between messages`

## Patch Plan
Target upstream-style `master`; the workspace is already on `master`. I found `README.md` but no `CONTRIBUTING`, `HACKING`, `README-hacking`, `docs/`, or `dev-docs/`. README’s git-build convention is `autoreconf`, `./configure`, then `make && make tests`.

Patch `log.c` only in the non-`HAVE_OPENLOG_R && SYSLOG_DATA_INIT` path: track whether OpenSSH has left global syslog open, close it during `log_init()` reconfiguration, open it for non-stderr logging, and avoid per-message `closelog()` in `do_log()`. Keep the `openlog_r` path unchanged because it uses local `struct syslog_data`.

Keep or add the local unit coverage in `regress/unittests/misc/test_log.c`, using the existing `test_helper` assertion style and fake `openlog`/`syslog`/`closelog` wrappers, and ensure it is listed in `regress/unittests/misc/Makefile`. This should improve/replace the prior Fixer baseline if validation shows it still closes syslog per message; avoid awkward `goto` because simple bounded conditionals are enough.

## Risks
Changing global syslog lifecycle may affect processes that rely on external libraries also using process-global syslog. The patch should explicitly preserve the local convention of restoring OpenSSH’s ident/facility with `openlog()` before `syslog()`, while not closing after every message.

No authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling semantics are intentionally changed.

## Validation
Before focused checks, try from the workspace root:

```sh
autoreconf -fi && ./configure && make
```

If that fails because dependencies or generated files are missing, record the exact failure, then run the narrow relevant path after whatever configure step succeeds:

```sh
make regress-unit-binaries
./regress/unittests/misc/test_misc -v
make unit
```

Bounded reproduction attempt: run `./regress/unittests/misc/test_misc -v` after building it and confirm whether `test_syslog_kept_open_between_messages` still aborts. In the final `## Issue Connection`, state that the original crash was observed by Fixer and not independently reproduced unless this command actually shows the failure.

## Patch Pass

Subject: no patch: syslog unit crash not reproducible

## Commit Message
No source change. The prepared `master` snapshot already contains the planned `log.c` syslog lifecycle handling and the misc unit coverage, and validation did not reproduce the observed abort.

## Evidence Confidence
observed

## Issue Connection
Fixer observed a SIGABRT from `./regress/unittests/misc/test_misc`, with the stack reaching `assert_int` in `test_syslog_kept_open_between_messages`. That is direct crash evidence, but I did not independently reproduce it.

The cautious code-level inference was that the non-`openlog_r` syslog path might have been closing process-global syslog between messages. The prepared source already has `syslog_open` tracking in `log.c`, keeps syslog open between messages, restores OpenSSH’s ident/facility before syslog writes, and has `test_helper`-style coverage in `regress/unittests/misc/test_log.c`.

I changed course from the plan because the code proved the planned patch was already present and the relevant test passed. The expected effect is that no source diff is emitted until a failing checkout or stronger evidence identifies a remaining defect.

## Git Add Paths
None

## Validation
Checked guidance: found `README.md`; no `CONTRIBUTING`, `HACKING`, `README-hacking`, `docs/`, or `dev-docs/`. README uses the git-build convention `autoreconf`, `./configure`, `make && make tests`. Target branch in the prepared workspace was `master`.

Ran project-level entrypoint:

```sh
autoreconf -fi && ./configure && make
```

Result: passed.

Independent reproduction attempt:

```sh
./regress/unittests/misc/test_misc -v
```

Initial result: blocked because `make` did not build `regress/unittests/misc/test_misc` by default: `No such file or directory`.

Then ran:

```sh
make regress-unit-binaries && ./regress/unittests/misc/test_misc -v
```

Result: passed; `syslog kept open between messages` was OK and all 112 misc tests passed.

Also ran:

```sh
make unit
```

Result: passed.

## Review Pass 1

RESULT: ok

No blocking findings. The latest output is a no-patch diagnosis, leaves no working-tree source diff, uses valid `observed` evidence confidence, does not claim local reproduction, and accurately reports that the relevant `test_misc` syslog lifecycle test passed after building unit binaries.

The validation is acceptable: project-level `autoreconf -fi && ./configure && make` was run, then focused `make regress-unit-binaries && ./regress/unittests/misc/test_misc -v`, then `make unit`. There is no `make check` target in `Makefile`/`Makefile.in`.

## Plan Pass

## Problem
Fixer observed `regress/unittests/misc/test_misc` aborting in `test_syslog_kept_open_between_messages`. The failure signal points at the new syslog lifecycle coverage for `log.c`, likely around the non-`openlog_r` path closing/reopening syslog between messages instead of keeping the connection open.

## Evidence Confidence
observed

## Proposed Subject
`log: keep syslog open between messages`

## Patch Plan
Target upstream-style `master`; the workspace is already on `master`. I found `README.md` but no `CONTRIBUTING`, `HACKING`, `README-hacking`, `docs/`, or `dev-docs/`. README’s git-build convention is `autoreconf`, `./configure`, then `make && make tests`.

Patch `log.c` only in the non-`HAVE_OPENLOG_R && SYSLOG_DATA_INIT` path: track whether OpenSSH has left global syslog open, close it during `log_init()` reconfiguration, open it for non-stderr logging, and avoid per-message `closelog()` in `do_log()`. Keep the `openlog_r` path unchanged because it uses local `struct syslog_data`.

Keep or add the local unit coverage in `regress/unittests/misc/test_log.c`, using the existing `test_helper` assertion style and fake `openlog`/`syslog`/`closelog` wrappers, and ensure it is listed in `regress/unittests/misc/Makefile`. This should improve/replace the prior Fixer baseline if validation shows it still closes syslog per message; avoid awkward `goto` because simple bounded conditionals are enough.

## Risks
Changing global syslog lifecycle may affect processes that rely on external libraries also using process-global syslog. The patch should explicitly preserve the local convention of restoring OpenSSH’s ident/facility with `openlog()` before `syslog()`, while not closing after every message.

No authentication, authorization, credentials, cryptography, sandboxing, permissions, or timing/throttling semantics are intentionally changed.

## Validation
Before focused checks, try from the workspace root:

```sh
autoreconf -fi && ./configure && make
```

If that fails because dependencies or generated files are missing, record the exact failure, then run the narrow relevant path after whatever configure step succeeds:

```sh
make regress-unit-binaries
./regress/unittests/misc/test_misc -v
make unit
```

Bounded reproduction attempt: run `./regress/unittests/misc/test_misc -v` after building it and confirm whether `test_syslog_kept_open_betw

[truncated]

Issue page: /issues/019e6e4b-ddc8-7ef0-87a3-056beccabf98. Issue JSON: /v1/issues/019e6e4b-ddc8-7ef0-87a3-056beccabf98

python3.13 is stuck in a likely file not found retry loop: 5.58% of sampled CPU passed through _PyEval_EvalFrameDefault, with repeated thread backtraces show 1 thread(s) around __internal_syscall_cancel (a1=..., a2=..., a3=..., a4=..., a5=..., a6=..., nr=...) at .<path>:44.

## 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): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has 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 `python3.13` 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, 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): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has 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 `python3.13` 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. 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 `python3.13` 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): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, 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 prov

[truncated 593 bytes]

## Plan Pass

## Problem

Fixer observed high aggregate CPU in `python3.13`, but the retained evidence ties the sampled process to an external virtualenv module entrypoint: `home_audio_mesh.ml.live_enricher`. The CPython thread backtrace is in `time.sleep(10)` via `Modules/timemodule.c:pysleep`, while strace shows the application repeatedly spawning shell/rsync/nice/ionice/python workers and doing normal import/path/locale lookups. There is no retained language-level stack or minimal reproducer showing a CPython runtime bug.

## Evidence Confidence

observed

## Proposed Subject

No CPython source patch for this pass: diagnose as application-entrypoint subprocess churn / import startup overhead observed under `/home/kom/.openclaw/venvs/panns-audio-tagging/bin/python`, not an upstream `python3.13` runtime defect.

## Patch Plan

Do not edit CPython from this evidence. Prepare a no-patch report explaining that the upstream default integration base would be CPython `main`/`master` per `README.rst` GitHub links and Developer Guide guidance, but the Debian source snapshot is only suitable for reproduction/backport validation.

Document the evidence limit: Fixer retained native frames and strace/perf data, but no Python stack tying the hot behavior to a CPython call. The sampled CPython runtime path uses established helpers/conventions: `_PyTime_FromSecondsObject`, `PyTime_Monotonic`, `_PyTime_AsTimespec`, `Py_BEGIN_ALLOW_THREADS`, and EINTR retry handling in `pysleep`; nearby `Modules/main.c` uses `PyImport_ImportModule`, `PyObject_Call`, `Py_DECREF`, and existing `goto error/done` cleanup conventions. No relevant local helper suggests replacing this with a bounded source change.

Recommend collecting extra entrypoint evidence before any source patch: `py-spy`/`gdb py-bt`/application logs for `home_audio_mesh.ml.live_enricher`, plus a minimal command showing CPython itself causing excessive file lookup retries. No prior Fixer source patch is present beyond the baseline commit, so there is nothing to replace.

## Risks

A CPython patch from this bundle would be speculative and likely wrong: changing import/path lookup, subprocess behavior, or `time.sleep` could affect broad language semantics and performance without addressing the observed application workload.

The strace ENOENTs include normal PATH probing, dynamic loader fallback, locale lookup, and import suffix checks, so treating them as a confirmed runtime file-not-found retry loop would overstate the evidence.

## Validation

Before reporting any source compile-only result, try the project-level entrypoint from the workspace root: `./configure && make`. If it fails due to missing generated files or build dependencies, record the exact command and failure reason, then use the narrowest reproducible check, such as compiling the touched leaf only if a future patch exists.

For this no-patch diagnosis, run one bounded independent smoke check after build if available: `strace -f -e trace=clock_nanosleep,newfstatat,execve ./python -c 'import time; time.sleep(0.1)'`. This should not be claimed as reproducing the reported issue; it only verifies the local `time.sleep` path behaves normally and helps separate CPython runtime behavior from the observed application subprocess churn.

## Patch Pass

Subject: No patch: Diagnose external live enricher subprocess churn

## Commit Message
No CPython source change is safe from this bundle. The likely root cause is not a `python3.13` runtime loop: Fixer sampled a Python process launched as `home_audio_mesh.ml.live_enricher`, and the retained strace shows that application spawning shell, rsync, nice/ionice, and worker Python subprocesses while the sampled CPython thread was in `time.sleep(10)`.

I followed the saved no-patch plan. I classify this as `inferred` rather than the plan’s `observed` because the trace is direct evidence of activity but still only indirect evidence for a CPython source bug.

## Evidence Confidence
inferred

## Issue Connection
The collected signal was high aggregate CPU for `python3.13`, with 30,658 `newfstatat` calls in a five-second strace and native samples in `_PyEval_EvalFrameDefault`. The representative backtrace for the sampled process is inside `time_sleep()` and `pysleep()`, where CPython converts the timeout with `_PyTime_*`, releases the GIL with `Py_BEGIN_ALLOW_THREADS`, and blocks in `clock_nanosleep`.

The cautious code-level inference is that the noisy file lookups come from the application entrypoint, not from a CPython retry loop. The readable `home_audio_mesh.ml.live_enricher` source matches the strace: it uses local helpers such as `_run()`, `_ssh()`, `_rsync_to_worker()`, and `_remote_python_module_command()` to repeatedly sync code/data and start worker modules. That application source is outside the acquired `python3.13` target repository, so I did not edit it.

The specific change made is none: I left the CPython tree unchanged. The expected effect is avoiding an upstream CPython patch that would be speculative and not pull-request-ready; the right next evidence would be a Python-level stack or minimal reproducer showing CPython itself mishandles this workload.

CPython contribution guidance in `README.rst` points maintainers to the Developer Guide and GitHub `main`; no Debian-local workaround or stable-branch patch is appropriate here. No relevant CPython helper was found that would turn the observed application subprocess churn into a bounded runtime change.

## Git Add Paths
None

## Validation
`./configure && make` from the workspace root completed with exit code 0 and built `./python`. Configure reported optional modules `_dbm`, `_gdbm`, and `_tkinter` missing. During extension import checks, `_ssl` was removed after failing to import with `undefined symbol: TLSv1_method`; the overall `make` command still exited successfully.

Independent reproduction attempt: `strace -f -e trace=clock_nanosleep,newfstatat,execve ./python -c 'import time; time.sleep(0.1)'` was blocked by ptrace restrictions: `PTRACE_TRACEME: Operation not permitted` and `ptrace(PTRACE_SEIZE, 4): Operation not permitted`.

Narrow smoke check after the strace blocker: `./python -c 'import time; time.sleep(0.1)'` exited 0. I then ran `make distclean`; final `git status --short` was clean.

## Review Pass 1

RESULT: ok

No findings. The pass correctly leaves no source diff for indirect profiler/strace evidence, uses a valid `## Evidence Confidence` value, and avoids presenting the CPython runtime as the confirmed cause.

Validation is adequately reported: the project-level `./configure && make` was attempted, the optional module issues are named, ptrace blocking for the independent strace smoke is explicit, and a narrower `./python -c 'import time; time.sleep(0.1)'` smoke check is included. The workspace is clean; comparison to the original snapshot only shows `.agents` and `.codex` metadata.

## Plan Pass

## Problem

Fixer observed high aggregate CPU in `python3.13`, but the retained evidence ties the sampled process to an external virtualenv module entrypoint: `home_audio_mesh.ml.live_enricher`. The CPython thread backtrace is in `time.sleep(10)` via `Modules/timemodule.c:pysleep`, while strace shows the application repeatedly spawning shell/rsync/nice/ionice/python workers and doing normal import/path/locale lookups. There is no retained language-level stack or minimal reproducer showing a CPython runtime bug.

## Evidence Confidence

observed

## Proposed Subject

No CPython source patch for this pass: diagnose as application-entrypoint subprocess churn / import startup overhead observed under `/home/kom/.openclaw/venvs/panns-audio-tagging/bin/python`, not an upstream `python3.13` runtime defect.

## Patch Plan

Do not edit CPython from this evidence. Prepare a no-patch report explaining that the upstream default integration base would be CPython `main`/`master` per `README.rst` GitHub links and Developer Guide guidance, but the Debian source snapshot is only suitable for reproduction/backport validation.

Document the evidence limit: Fixer retained native frames and strace/perf data, but no Python stack tying the hot behavior to a CPython call. The sampled CPython runtime path uses established helpers/conventions: `_PyTime_FromSecondsObject`, `PyTime_Monotonic`, `_PyTime_AsTimespec`, `Py_BEGIN_ALLOW_THREADS`, and EINTR retry handling in `pysleep`; nearby `Modules/main.c` uses `PyImport_ImportModule`, `PyObject_Call`, `Py_DECREF`, and existing `goto error/done` cleanup conventions. No relevant local helper suggests replacing this with a bounded source change.

Recommend collecting extra entrypoint evidence before any source patch: `py-spy`/`gdb py-bt`/application logs for `home_audio_mesh.ml.live_enricher`, plus a minimal command showing CPython itself causing excessive file lookup retries. No prior Fixer source patch is present beyond the baseline commit, so there is nothing to replace.

## Risks

A CPython patch from this bundle would be speculative and likely wrong: changing import/path lookup, subprocess behavior, or `time.sleep` could affect broad language semantics and performance without addressing the observed application workload.

The strace ENOENTs include normal PATH probing, dynamic loader fallback, locale lookup, and import suff

[truncated]

Issue page: /issues/019d6625-be79-7112-9f02-a3fe9af292db. Issue JSON: /v1/issues/019d6625-be79-7112-9f02-a3fe9af292db

perl is stuck in a likely busy poll loop: 100.00% of sampled CPU passed through Perl_runops_standard, with repeated pselect6 x4.

## 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): `./Configure -des -Dusedevel && make -j2 && make test_harness`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has 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 `perl` 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, 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.

Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `./Configure -des -Dusedevel && make -j2 && make test_harness`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has 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 `perl` 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. 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 (local metadata check)

Local metadata consistency check

## Refinement Pass 1

You are refining a fixer patch after an explicit code review.

Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Read the latest author response at `./patch-output.txt`. Read the review report at `./review-1-output.txt`. This is refinement round 1. The original pre-edit snapshot is available at `./source` if you need to compare the current patch against it. Re-read the planning pass at `./plan-output.txt` before editing. The workspace currently changes these repo-relative paths: .config/README, .config/instruct, DynaLoader.o, MANIFEST.srt, Makefile, Policy.sh, av.o, bitcount.h, builtin.o, caretx.o, cflags, class.o, config.h, config.sh, cpan/Archive-Tar/Makefile, cpan/Archive-Tar/Makefile.PL, cpan/Archive-Tar/blib/bin/.exists, cpan/Archive-Tar/blib/man1/.exists, cpan/Archive-Tar/blib/man3/.exists, cpan/Archive-Tar/blib/script/.exists, cpan/Archive-Tar/pm_to_blib, cpan/AutoLoader/pm_to_blib, cpan/CPAN-Meta-Requirements/pm_to_blib, cpan/CPAN-Meta-YAML/pm_to_blib, cpan/CPAN-Meta/Makefile, cpan/CPAN-Meta/Makefile.PL, cpan/CPAN-Meta/blib/bin/.exists, cpan/CPAN-Meta/blib/man1/.exists, cpan/CPAN-Meta/blib/man3/.exists, cpan/CPAN-Meta/blib/script/.exists, cpan/CPAN-Meta/pm_to_blib, cpan/CPAN/Makefile, cpan/CPAN/Makefile.PL, cpan/CPAN/blib/bin/.exists, cpan/CPAN/blib/man1/.exists, cpan/CPAN/blib/man3/.exists, cpan/CPAN/blib/script/.exists, cpan/CPAN/pm_to_blib, cpan/Compress-Raw-Bzip2/Bzip2.bs, cpan/Compress-Raw-Bzip2/Bzip2.c, cpan/Compress-Raw-Bzip2/Bzip2.o, cpan/Compress-Raw-Bzip2/Makefile, cpan/Compress-Raw-Bzip2/blib/bin/.exists, cpan/Compress-Raw-Bzip2/blib/man1/.exists, cpan/Compress-Raw-Bzip2/blib/man3/.exists, cpan/Compress-Raw-Bzip2/blib/script/.exists, cpan/Compress-Raw-Bzip2/blocksort.c, cpan/Compress-Raw-Bzip2/blocksort.o, cpan/Compress-Raw-Bzip2/bzlib.c, cpan/Compress-Raw-Bzip2/bzlib.h, cpan/Compress-Raw-Bzip2/bzlib.o, cpan/Compress-Raw-Bzip2/bzlib_private.h, cpan/Compress-Raw-Bzip2/compress.c, cpan/Compress-Raw-Bzip2/compress.o, cpan/Compress-Raw-Bzip2/constants.h, cpan/Compress-Raw-Bzip2/constants.xs, cpan/Compress-Raw-Bzip2/crctable.c, cpan/Compress-Raw-Bzip2/crctable.o, cpan/Compress-Raw-Bzip2/decompress.c, cpan/Compress-Raw-Bzip2/decompress.o, cpan/Compress-Raw-Bzip2/huffman.c, cpan/Compress-Raw-Bzip2/huffman.o, cpan/Compress-Raw-Bzip2/pm_to_blib, cpan/Compress-Raw-Bzip2/randtable.c, cpan/Compress-Raw-Bzip2/randtable.o, cpan/Compress-Raw-Zlib/Makefile, cpan/Compress-Raw-Zlib/Zlib.bs, cpan/Compress-Raw-Zlib/Zlib.c, cpan/Compress-Raw-Zlib/Zlib.o, cpan/Compress-Raw-Zlib/adler32.c, cpan/Compress-Raw-Zlib/adler32.o, cpan/Compress-Raw-Zlib/blib/bin/.exists, cpan/Compress-Raw-Zlib/blib/man1/.exists, cpan/Compress-Raw-Zlib/blib/man3/.exists, cpan/Compress-Raw-Zlib/blib/script/.exists, cpan/Compress-Raw-Zlib/compress.c, cpan/Compress-Raw-Zlib/compress.o, cpan/Compress-Raw-Zlib/constants.h, cpan/Compress-Raw-Zlib/constants.xs, cpan/Compress-Raw-Zlib/crc32.c, cpan/Compress-Raw-Zlib/crc32.o, cpan/Compress-Raw-Zlib/deflate.c, cpan/Compress-Raw-Zlib/deflate.o, cpan/Compress-Raw-Zlib/infback.c, cpan/Compress-Raw-Zlib/infback.o, cpan/Compress-Raw-Zlib/inffast.c, cpan/Compress-Raw-Zlib/inffast.o, cpan/Compress-Raw-Zlib/inflate.c, cpan/Compress-Raw-Zlib/inflate.o, cpan/Compress-Raw-Zlib/inftrees.c, cpan/Compress-Raw-Zlib/inftrees.o, cpan/Compress-Raw-Zlib/pm_to_blib, cpan/Compress-Raw-Zlib/trees.c, cpan/Compress-Raw-Zlib/trees.o, cpan/Compress-Raw-Zlib/uncompr.c, cpan/Compress-Raw-Zlib/uncompr.o, cpan/Compress-Raw-Zlib/zutil.c, cpan/Compress-Raw-Zlib/zutil.o, cpan/Config-Perl-V/pm_to_blib, cpan/DB_File/ppport.h, cpan/Digest-MD5/MD5.bs, cpan/Digest-MD5/MD5.c, cpan/Digest-MD5/MD5.o, cpan/Digest-MD5/Makefile, cpan/Digest-MD5/blib/bin/.exists, cpan/Digest-MD5/blib/man1/.exists, cpan/Digest-MD5/blib/man3/.exists, cpan/Digest-MD5/blib/script/.exists, cpan/Digest-MD5/pm_to_blib, cpan/Digest-SHA/Makefile, cpan/Digest-SHA/SHA.bs, cpan/Digest-SHA/SHA.c, cpan/Digest-SHA/SHA.o, cpan/Digest-SHA/blib/bin/.exists, cpan/Digest-SHA/blib/man1/.exists, cpan/Digest-SHA/blib/man3/.exi

[truncated 84009 bytes]

## Plan Pass

## Problem
Fixer observed `/usr/bin/perl` consuming CPU with samples in `Perl_runops_standard` and a short syscall signal of repeated `pselect6`, but the bundle has no Perl script entrypoint, command line, stack excerpt, meaningful strace body, or reproducer. `Perl_runops_standard` is the generic opcode loop, so it is not enough to identify a runtime defect.

## Evidence Confidence
inferred

## Proposed Subject
No source patch yet: report insufficient evidence for an upstream Perl runtime change and request/collect a reproducer or richer trace tying the busy polling to a specific Perl op, module, or script event loop.

## Patch Plan
Do not edit files in this pass. The likely touched areas would be `run.c` for `Perl_runops_standard` and `pp_sys.c`/`t/op/sselect.t` for core four-arg `select`, but the evidence does not show that core `select` is wrong rather than a Perl program repeatedly polling with a zero or expired timeout.

Upstream conventions found: `README` points patch authors to `pod/perlhack.pod`; `perlhack` says to base work on Perl’s `blead` branch and validate with `./Configure -des -Dusedevel` and `make test`. The local socket helper is `PerlSock_select` from `iperlsys.h`, and nearby C code uses Perl allocation/SV helpers such as `Newx`, `Safefree`, `SvGETMAGIC`, `SvPV_force_nomg_nolen`, and `SvSETMAGIC`; any future patch should keep those wrappers rather than raw libc or ad hoc SV handling.

No prior Fixer source patch is present beyond the baseline commit. If later evidence identifies a real core bug, prefer a bounded conditional/early-return style and local helper APIs; do not introduce awkward control flow such as avoidable `goto`.

## Risks
Changing Perl’s run loop or `select` implementation from profiler-only evidence is high blast radius and likely to alter correct user-space polling behavior. A mitigation such as sleeping/yielding in `Perl_runops_standard` would be semantically wrong and performance-sensitive. A `select` change without a reproducer could break platform compatibility around masks, magic, UTF-8 downgrading, and timeout handling.

## Validation
Before reporting any focused result, try the project-level entrypoint from the workspace root:

`./Configure -des -Dusedevel && make -j2 && make test_harness`

If that fails because Debian-source generated files or dependencies are missing, record the exact failure and then run the narrowest relevant check, likely `make test_harness TEST_ARGS='t/op/sselect.t'` after any successful build.

Bounded independent reproduction attempt: run a tiny Perl script under `strace -c` that performs `select(undef, undef, undef, 0)` in a loop, confirming that the collected signal can be produced by user Perl code without proving a runtime bug. This would support the no-patch diagnosis unless richer evidence ties the runaway loop to incorrect Perl core behavior.

## Patch Pass

Subject: Diagnose Perl busy-poll evidence without source changes

## Commit Message
No source change. The evidence only shows a Perl process repeatedly reaching a poll-family syscall while samples land in `Perl_runops_standard`, the generic opcode dispatcher. Without the Perl command line, script, stack, or a reproducer, this is not enough to justify changing Perl core behavior.

## Evidence Confidence
inferred

## Issue Connection
Fixer collected a runaway-process signal for `/usr/bin/perl`: CPU samples were attributed to `Perl_runops_standard`, the normal Perl opcode execution loop, and the syscall signal showed repeated `pselect6` with the process sleeping in `poll_schedule_timeout.constprop.0`.

The cautious code-level inference is that some Perl code or module was repeatedly calling a poll/select operation with a zero or expired timeout. `Perl_runops_standard` is expected to appear for nearly any running Perl program, so it does not identify a core runtime defect by itself. Nearby select code already routes through Perl’s portability wrapper `PerlSock_select` and uses local SV/allocation helpers such as `SvGETMAGIC`, `SvPV_force_nomg_nolen`, `Newx`, and `Safefree`.

I followed the saved plan and left no source diff. Upstream contribution docs point patch work at Perl’s `blead` branch via `pod/perlhack.pod`/`pod/perlgit.pod`; this Debian-source workspace is useful for validation, but the available evidence is not pull-request-ready for an upstream Perl patch. The expected effect is no behavioral change until richer evidence ties the busy poll to a specific Perl core invariant rather than user-level event-loop behavior.

## Git Add Paths
None

## Validation
Tried the requested project-level entrypoint from the workspace root:

`./Configure -des -Dusedevel && make -j2 && make test_harness`

`Configure` and `make -j2` progressed through building `perl`; `make test_harness` also progressed into the test suite. The command did not complete: the tool session stopped producing output for several minutes after the harness reached the `cpan/autodie` tests, and stdin was already closed so it could not be interrupted cleanly. No final exit status was available.

Focused check run after the project-level command stalled:

`./perl -Ilib t/op/sselect.t`

Result: passed all 23 tests.

Independent reproduction attempt:

`timeout 5 strace -qq -c -e trace=pselect6,select ./perl -Ilib -e 'for (1..10000) { select(undef, undef, undef, 0) }'`

Blocked by sandbox ptrace restrictions: `PTRACE_TRACEME: Operation not permitted` and `ptrace(PTRACE_SEIZE, 5): Operation not permitted`.

Fallback smoke check:

`./perl -Ilib -MTime::HiRes=time -e 'my $t=time; for (1..100000) { select(undef, undef, undef, 0) } printf "elapsed=%.6f\n", time-$t'`

Result: `elapsed=0.010630`, showing the same general busy-poll shape can be produced by ordinary Perl code, but not reproducing the reported runaway failure.

## Review Pass 1 (local metadata check)

RESULT: fix-needed

## Findings
1. Patch metadata drift: the workspace currently changes `.config/README`, `.config/instruct`, `DynaLoader.o`, `MANIFEST.srt`, `Makefile`, `Policy.sh`, `av.o`, `bitcount.h`, `builtin.o`, `caretx.o`, `cflags`, `class.o`, `config.h`, `config.sh`, `cpan/Archive-Tar/Makefile`, `cpan/Archive-Tar/Makefile.PL`, `cpan/Archive-Tar/blib/bin/.exists`, `cpan/Archive-Tar/blib/man1/.exists`, `cpan/Archive-Tar/blib/man3/.exists`, `cpan/Archive-Tar/blib/script/.exists`, `cpan/Archive-Tar/pm_to_blib`, `cpan/AutoLoader/pm_to_blib`, `cpan/CPAN-Meta-Requirements/pm_to_blib`, `cpan/CPAN-Meta-YAML/pm_to_blib`, `cpan/CPAN-Meta/Makefile`, `cpan/CPAN-Meta/Makefile.PL`, `cpan/CPAN-Meta/blib/bin/.exists`, `cpan/CPAN-Meta/blib/man1/.exists`, `cpan/CPAN-Meta/blib/man3/.exists`, `cpan/CPAN-Meta/blib/script/.exists`, `cpan/CPAN-Meta/pm_to_blib`, `cpan/CPAN/Makefile`, `cpan/CPAN/Makefile.PL`, `cpan/CPAN/blib/bin/.exists`, `cpan/CPAN/blib/man1/.exists`, `cpan/CPAN/blib/man3/.exists`, `cpan/CPAN/blib/script/.exists`, `cpan/CPAN/pm_to_blib`, `cpan/Compress-Raw-Bzip2/Bzip2.bs`, `cpan/Compress-Raw-Bzip2/Bzip2.c`, `cpan/Compress-Raw-Bzip2/Bzip2.o`, `cpan/Compress-Raw-Bzip2/Makefile`, `cpan/Compress-Raw-Bzip2/blib/bin/.exists`, `cpan/Compress-Raw-Bzip2/blib/man1/.exists`, `cpan/Compress-Raw-Bzip2/blib/man3/.exists`, `cpan/Compress-Raw-Bzip2/blib/script/.exists`, `cpan/Compress-Raw-Bzip2/blocksort.c`, `cpan/Compress-Raw-Bzip2/blocksort.o`, `cpan/Compress-Raw-Bzip2/bzlib.c`, `cpan/Compress-Raw-Bzip2/bzlib.h`, `cpan/Compress-Raw-Bzip2/bzlib.o`, `cpan/Compress-Raw-Bzip2/bzlib_private.h`, `cpan/Compress-Raw-Bzip2/compress.c`, `cpan/Compress-Raw-Bzip2/compress.o`, `cpan/Compress-Raw-Bzip2/constants.h`, `cpan/Compress-Raw-Bzip2/constants.xs`, `cpan/Compress-Raw-Bzip2/crctable.c`, `cpan/Compress-Raw-Bzip2/crctable.o`, `cpan/Compress-Raw-Bzip2/decompress.c`, `cpan/Compress-Raw-Bzip2/decompress.o`, `cpan/Compress-Raw-Bzip2/huffman.c`, `cpan/Compress-Raw-Bzip2/huffman.o`, `cpan/Compress-Raw-Bzip2/pm_to_blib`, `cpan/Compress-Raw-Bzip2/randtable.c`, `cpan/Compress-Raw-Bzip2/randtable.o`, `cpan/Compress-Raw-Zlib/Makefile`, `cpan/Compress-Raw-Zlib/Zlib.bs`, `cpan/Compress-Raw-Zlib/Zlib.c`, `cpan/Compress-Raw-Zlib/Zlib.o`, `cpan/Compress-Raw-Zlib/adler32.c`, `cpan/Compress-Raw-Zlib/adler32.o`, `cpan/Compress-Raw-Zlib/blib/bin/.exists`, `cpan/Compress-Raw-Zlib/blib/man1/.exists`, `cpan/Compress-Raw-Zlib/blib/man3/.exists`, `cpan/Compress-Raw-Zlib/blib/script/.exists`, `cpan/Compress-Raw-Zlib/compress.c`, `cpan/Compress-Raw-Zlib/compress.o`, `cpan/Compress-Raw-Zlib/constants.h`, `cpan/Compress-Raw-Zlib/constants.xs`, `cpan/Compress-Raw-Zlib/crc32.c`, `cpan/Compress-Raw-Zlib/crc32.o`, `cpan/Compress-Raw-Zlib/deflate.c`, `cpan/Compress-Raw-Zlib/deflate.o`, `cpan/Compress-Raw-Zlib/infback.c`, `cpan/Compress-Raw-Zlib/infback.o`, `cpan/Compress-Raw-Zlib/inffast.c`, `cpan/Compress-Raw-Zlib/inffast.o`, `cpan/Compress-Raw-Zlib/inflate.c`, `cpan/Compress-Raw-Zlib/inflate.o`, `cpan/Compress-Raw-Zlib/inftrees.c`, `cpan/Compress-Raw-Zlib/inftrees.o`, `cpan/Compress-Raw-Zlib/pm_to_blib`, `cpan/Compress-Raw-Zlib/trees.c`, `cpan/Compress-Raw-Zlib/trees.o`, `cpan/Compress-Raw-Zlib/uncompr.c`, `cpan/Compress-Raw-Zlib/uncompr.o`, `cpan/Compress-Raw-Zlib/zutil.c`, `cpan/Compress-Raw-Zlib/zutil.o`, `cpan/Config-Perl-V/pm_to_blib`, `cpan/DB_File/ppport.h`, `cpan/Digest-MD5/MD5.bs`, `cpan/Digest-MD5/MD5.c`, `cpan/Digest-MD5/MD5.o`, `cpan/Digest-MD5/Makefile`, `cpan/Digest-MD5/blib/bin/.exists`, `cpan/Digest-MD5/blib/man1/.exists`, `cpan/Digest-MD5/blib/man3/.exists`, `cpan/Digest-MD5/blib/script/.exists`, `cpan/Digest-MD5/pm_to_blib`, `cpan/Digest-SHA/Makefile`, `cpan/Digest-SHA/SHA.bs`, `cpan/Digest-SHA/SHA.c`, `cpan/Digest-SHA/SHA.o`, `cpan/Digest-SHA/blib/bin/.exists`, `cpan/Digest-SHA/blib/man1/.exists`, `cpan/Digest-SHA/blib/man3/.exists`, `cpan/Digest-SHA/blib/script/.exists`, `cpan/Digest-SHA/blib/script/shasum`, `cpan/Digest-SHA/pm_to_blib`, `cpan/Digest/pm_to_blib`, `cpan/Encode/Byte/Byte.bs`, `cpan/Encode/Byte/Byte.c`, `cpan/Encode/Byte/Byte.o`, `cpan/Encode/Byte/Byte.xs`, `cpan/Encode/Byte/Makefile`, `cpan/Encode/Byte/byte_t.c`, `cpan/Encode/Byte/byte_t.exh`, `cpan/Encode/Byte/byte_t.fnm`, `cpan/Encode/Byte/byte_t.h`, `cpan/Encode/Byte/byte_t.o`, `cpan/Encode/Byte/pm_to_blib`, `cpan/Encode/CN/CN.bs`, `cpan/Encode/CN/CN.c`, `cpan/Encode/CN/CN.o`, `cpan/Encode/CN/CN.xs`, `cpan/Encode/CN/Makefile`, `cpan/Encode/CN/cp_00_t.c`, `cpan/Encode/CN/cp_00_t.exh`, `cpan/Encode/CN/cp_00_t.fnm`, `cpan/Encode/CN/cp_00_t.h`, `cpan/Encode/CN/cp_00_t.o`, `cpan/Encode/CN/eu_01_t.c`, `cpan/Encode/CN/eu_01_t.exh`, `cpan/Encode/CN/eu_01_t.fnm`, `cpan/Encode/CN/eu_01_t.h`, `cpan/Encode/CN/eu_01_t.o`, `cpan/Encode/CN/gb_02_t.c`, `cpan/Encode/CN/gb_02_t.exh`, `cpan/Encode/CN/gb_02_t.fnm`, `cpan/Encode/CN/gb_02_t.h`, `cpan/Encode/CN/gb_02_t.o`, `cpan/Encode/CN/gb_03_t.c`, `cpan/Encode/CN/gb_03_t.exh`, `cpan/Encode/CN/gb_03_t.fnm`, `cpan/Encode/CN/gb_03_t.h`, `cpan/Encode/CN/gb_03_t.o`, `cpan/Encode/CN/ir_04_t.c`, `cpan/Encode/CN/ir_04_t.exh`, `cpan/Encode/CN/ir_04_t.fnm`, `cpan/Encode/CN/ir_04_t.h`, `cpan/Encode/CN/ir_04_t.o`, `cpan/Encode/CN/ma_05_t.c`, `cpan/Encode/CN/ma_05_t.exh`, `cpan/Encode/CN/ma_05_t.fnm`, `cpan/Encode/CN/ma_05_t.h`, `cpan/Encode/CN/ma_05_t.o`, `cpan/Encode/CN/pm_to_blib`, `cpan/Encode/EBCDIC/EBCDIC.bs`, `cpan/Encode/EBCDIC/EBCDIC.c`, `cpan/Encode/EBCDIC/EBCDIC.o`, `cpan/Encode/EBCDIC/EBCDIC.xs`, `cpan/Encode/EBCDIC/Makefile`, `cpan/Encode/EBCDIC/ebcdic_t.c`, `cpan/Encode/EBCDIC/ebcdic_t.exh`, `cpan/Encode/EBCDIC/ebcdic_t.fnm`, `cpan/Encode/EBCDIC/ebcdic_t.h`, `cpan/Encode/EBCDIC/ebcdic_t.o`, `cpan/Encode/EBCDIC/pm_to_blib`, `cpan/Encode/Encode.bs`, `cpan/Encode/Encode.c`, `cpan/Encode/Encode.o`, `cpan/Encode/JP/JP.bs`, `cpan/Encode/JP/JP.c`, `cpan/Encode/JP/JP.o`, `cpan/Encode/JP/JP.xs`, `cpan/Encode/JP/Makefile`, `cpan/Encode/JP/cp_00_t.c`, `cpan/Encode/JP/cp_00_t.exh`, `cpan/Encode/JP/cp_00_t.fnm`, `cpan/Encode/JP/cp_00_t.h`, `cpan/Encode/JP/cp_00_t.o`, `cpan/Encode/JP/eu_01_t.c`, `cpan/Encode/JP/eu_01_t.exh`, `cpan/Encode/JP/eu_01_t.fnm`, `cpan/Encode/JP/eu_01_t.h`, `cpan/Encode/JP/eu_01_t.o`, `cpan/Encode/JP/ji_02_t.c`, `cpan/Encode/JP/ji_02_t.exh`, `cpan/Encode/JP/ji_02_t.fnm`, `cpan/Encode/JP/ji_02_t.h`, `cpan/Encode/JP/ji_02_t.o`, `cpan/Encode/JP/ji_03_t.c`, `cpan/Encode/JP/ji_03_t.exh`, `cpan/Encode/JP/ji_03_t.fnm`, `cpan/Encode/JP/ji_03_t.h`, `cpan/Encode/JP/ji_03_t.o`, `cpan/Encode/JP/ji_04_t.c`, `cpan/Encode/JP/ji_04_t.exh`, `cpan/Encode/JP/ji_04_t.fnm`, `cpan/Encode/JP/ji_04_t.h`, `cpan/Encode/JP/ji_04_t.o`, `cpan/Encode/JP/ma_05_t.c`, `cpan/Encode/JP/ma_05_t.exh`, `cpan/Encode/JP/ma_05_t.fnm`, `cpan/Encode/JP/ma_05_t.h`, `cpan/Encode/JP/ma_05_t.o`, `cpan/Encode/JP/pm_to_blib`, `cpan/Encode/JP/sh_06_t.c`, `cpan/Encode/JP/sh_06_t.exh`, `cpan/Encode/JP/sh_06_t.fnm`, `cpan/Encode/JP/sh_06_t.h`, `cpan/Encode/JP/sh_06_t.o`, `cpan/Encode/KR/KR.bs`, `cpan/Encode/KR/KR.c`, `cpan/Encode/KR/KR.o`, `cpan/Encode/KR/KR.xs`, `cpan/Encode/KR/Makefile`, `cpan/Encode/KR/cp_00_t.c`, `cpan/Encode/KR/cp_00_t.exh`, `cpan/Encode/KR/cp_00_t.fnm`, `cpan/Encode/KR/cp_00_t.h`, `cpan/Encode/KR/cp_00_t.o`, `cpan/Encode/KR/eu_01_t.c`, `cpan/Encode/KR/eu_01_t.exh`, `cpan/Encode/KR/eu_01_t.fnm`, `cpan/Encode/KR/eu_01_t.h`, `cpan/Encode/KR/eu_01_t.o`, `cpan/Encode/KR/jo_02_t.c`, `cpan/Encode/KR/jo_02_t.exh`, `cpan/Encode/KR/jo_02_t.fnm`, `cpan/Encode/KR/jo_02_t.h`, `cpan/Encode/KR/jo_02_t.o`, `cpan/Encode/KR/ks_03_t.c`, `cpan/Encode/KR/ks_03_t.exh`, `cpan/Encode/KR/ks_03_t.fnm`, `cpan/Encode/KR/ks_03_t.h`, `cpan/Encode/KR/ks_03_t.o`, `cpan/Encode/KR/ma_04_t.c`, `cpan/Encode/KR/ma_04_t.exh`, `cpan/Encode/KR/ma_04_t.fnm`, `cpan/Encode/KR/ma_04_t.h`, `cpan/Encode/KR/ma_04_t.o`, `cpan/Encode/KR/pm_to_blib`, `cpan/Encode/Makefile`, `cpan/Encode/Symbol/Makefile`, `cpan/Encode/Symbol/Symbol.bs`, `cpan/Encode/Symbol/Symbol.c`, `cpan/Encode/Symbol/Symbol.o`, `cpan/Encode/Symbol/Symbol.xs`, `cpan/Encode/Symbol/pm_to_blib`, `cpan/Encode/Symbol/symbol_t.c`, `cpan/Encode/Symbol/symbol_t.exh`, `cpan/Encode/Symbol/symbol_t.fnm`, `cpan/Encode/Symbol/symbol_t.h`, `cpan/Encode/Symbol/symbol_t.o`, `cpan/Encode/TW/Makefile`, `cpan/Encode/TW/TW.bs`, `cpan/Encode/TW/TW.c`, `cpan/Encode/TW/TW.o`, `cpan/Encode/TW/TW.xs`, `cpan/Encode/TW/bi_00_t.c`, `cpan/Encode/TW/bi_00_t.exh`, `cpan/Encode/TW/bi_00_t.fnm`, `cpan/Encode/TW/bi_00_t.h`, `cpan/Encode/TW/bi_00_t.o`, `cpan/Encode/TW/bi_01_t.c`, `cpan/Encode/TW/bi_01_t.exh`, `cpan/Encode/TW/bi_01_t.fnm`, `cpan/Encode/TW/bi_01_t.h`, `cpan/Encode/TW/bi_01_t.o`, `cpan/Encode/TW/cp_02_t.c`, `cpan/Encode/TW/cp_02_t.exh`, `cpan/Encode/TW/cp_02_t.fnm`, `cpan/Encode/TW/cp_02_t.h`, `cpan/Encode/TW/cp_02_t.o`, `cpan/Encode/TW/ma_03_t.c`, `cpan/Encode/TW/ma_03_t.exh`, `cpan/Encode/TW/ma_03_t.fnm`, `cpan/Encode/TW/ma_03_t.h`, `cpan/Encode/TW/ma_03_t.o`, `cpan/Encode/TW/pm_to_blib`, `cpan/Encode/Unicode/Makefile`, `cpan/Encode/Unicode/Unicode.bs`, `cpan/Encode/Unicode/Unicode.c`, `cpan/Encode/Unicode/Unicode.o`, `cpan/Encode/Unicode/pm_to_blib`, `cpan/Encode/blib/bin/.exists`, `cpan/Encode/blib/man1/.exists`, `cpan/Encode/blib/man3/.exists`, `cpan/Encode/blib/script/.exists`, `cpan/Encode/blib/script/enc2xs`, `cpan/Encode/blib/script/encguess`, `cpan/Encode/blib/script/piconv`, `cpan/Encode/def_t.c`, `cpan/Encode/def_t.exh`, `cpan/Encode/def_t.fnm`, `cpan/Encode/def_t.h`, `cpan/Encode/def_t.o`, `cpan/Encode/encengine.o`, `cpan/Encode/pm_to_blib`, `cpan/ExtUtils-Constant/pm_to_blib`, `cpan/ExtUtils-Install/pm_to_blib`, `cpan/ExtUtils-MakeMaker/Makefile`, `cpan/ExtUtils-MakeMaker/Makefile.PL`, `cpan/ExtUtils-MakeMaker/blib/bin/.exists`, `cpan/ExtUtils-MakeMaker/blib/man1/.exists`, `cpan/ExtUtils-MakeMaker/blib/man3/.exists`, `cpan/ExtUtils-MakeMaker/blib/script/.exists`, `cpan/ExtUtils-MakeMaker/pm_to_blib`, `cpan/ExtUtils-Manifest/Makefile`, `cpan/ExtUtils-Manifest/Makefile.PL`, `cpan/ExtUtils-Manifest/blib/bin/.exists`, `cpan/ExtUtils-Manifest/blib/man1/.exists`, `cpan/ExtUtils-Manifest/blib/man3/.exists`, `cpan/ExtUtils-Manifest/blib/script/.exists`, `cpan/ExtUtils-Manifest/pm_to_blib`, `cpan/ExtUtils-PL2Bat/pm_to_blib`, `cpan/File-Fetch/pm_to_blib`, `cpan/File-Path/pm_to_blib`, `cpan/File-Temp/pm_to_blib`, `cpan/Filter-Util-Call/Call.bs`, `cpan/Filter-Util-Call/Call.c`, `cpan/Filter-Util-Call/Call.o`, `cpan/Filter-Util-Call/Makefile`, `cpan/Filter-Util-Call/Makefile.PL`, `cpan/Filter-Util-Call/blib/bin/.exists`, `cpan/Filter-Util-Call/blib/man1/.exists`, `cpan/Filter-Util-Call/blib/man3/.exists`, `cpan/Filter-Util-Call/blib/script/.exists`, `cpan/Filter-Util-Call/pm_to_blib`, `cpan/Getopt-Long/pm_to_blib`, `cpan/HTTP-Tiny/Makefile`, `cpan/HTTP-Tiny/Makefile.PL`, `cpan/HTTP-Tiny/blib/bin/.exists`, `cpan/HTTP-Tiny/blib/man1/.exists`, `cpan/HTTP-Tiny/blib/man3/.exists`, `cpan/HTTP-Tiny/blib/script/.exists`, `cpan/HTTP-Tiny/pm_to_blib`, `cpan/IO-Compress/Makefile`, `cpan/IO-Compress/blib/bin/.exists`, `cpan/IO-Compress/blib/man1/.exists`, `cpan/IO-Compress/blib/man3/.exists`, `cpan/IO-Compress/blib/script/.exists`, `cpan/IO-Compress/blib/script/streamzip`, `cpan/IO-Compress/blib/script/zipdetails`, `cpan/IO-Compress/pm_to_blib`, `cpan/IO-Socket-IP/pm_to_blib`, `cpan/IO-Zlib/pm_to_blib`, `cpan/IPC-Cmd/pm_to_blib`, `cpan/IPC-SysV/Makefile`, `cpan/IPC-SysV/SysV.bs`, `cpan/IPC-SysV/SysV.c`, `cpan/IPC-SysV/SysV.o`, `cpan/IPC-SysV/blib/bin/.exists`, `cpan/IPC-SysV/blib/man1/.exists`, `cpan/IPC-SysV/blib/man3/.exists`, `cpan/IPC-SysV/blib/script/.exists`, `cpan/IPC-SysV/const-c.inc`, `cpan/IPC-SysV/const-xs.inc`, `cpan/IPC-SysV/pm_to_blib`, `cpan/IPC-SysV/ppport.h`, `cpan/JSON-PP/Makefile`, `cpan/JSON-PP/Makefile.PL`, `cpan/JSON-PP/blib/bin/.exists`, `cpan/JSON-PP/blib/man1/.exists`, `cpan/JSON-PP/blib/man3/.exists`, `cpan/JSON-PP/blib/script/.exists`, `cpan/JSON-PP/pm_to_blib`, `cpan/Locale-Maketext-Simple/pm_to_blib`, `cpan/MIME-Base64/Base64.bs`, `cpan/MIME-Base64/Base64.c`, `cpan/MIME-Base64/Base64.o`, `cpan/MIME-Base64/Makefile`, `cpan/MIME-Base64/Makefile.PL`, `cpan/MIME-Base64/blib/bin/.exists`, `cpan/MIME-Base64/blib/man1/.exists`, `cpan/MIME-Base64/blib/man3/.exists`, `cpan/MIME-Base64/blib/script/.exists`, `cpan/MIME-Base64/pm_to_blib`, `cpan/Math-BigInt-FastCalc/FastCalc.bs`, `cpan/Math-BigInt-FastCalc/FastCalc.c`, `cpan/Math-BigInt-FastCalc/FastCalc.o`, `cpan/Math-BigInt-FastCalc/Makefile`, `cpan/Math-BigInt-FastCalc/Makefile.PL`, `cpan/Math-BigInt-FastCalc/blib/bin/.exists`, `cpan/Math-BigInt-FastCalc/blib/man1/.exists`, `cpan/Math-BigInt-FastCalc/blib/man3/.exists`, `cpan/Math-BigInt-FastCalc/blib/script/.exists`, `cpan/Math-BigInt-FastCalc/pm_to_blib`, `cpan/Math-BigInt/pm_to_blib`, `cpan/Memoize/pm_to_blib`, `cpan/Module-Load-Conditional/pm_to_blib`, `cpan/Module-Load/pm_to_blib`, `cpan/Module-Loaded/pm_to_blib`, `cpan/Module-Metadata/Makefile`, `cpan/Module-Metadata/Makefile.PL`, `cpan/Module-Metadata/blib/bin/.exists`, `cpan/Module-Metadata/blib/man1/.exists`, `cpan/Module-Metadata/blib/man3/.exists`, `cpan/Module-Metadata/blib/script/.exists`, `cpan/Module-Metadata/pm_to_blib`, `cpan/NEXT/pm_to_blib`, `cpan/Params-Check/pm_to_blib`, `cpan/Perl-OSType/pm_to_blib`, `cpan/PerlIO-via-QuotedPrint/pm_to_blib`, `cpan/Pod-Checker/Makefile`, `cpan/Pod-Checker/Makefile.PL`, `cpan/Pod-Checker/blib/bin/.exists`, `cpan/Pod-Checker/blib/man1/.exists`, `cpan/Pod-Checker/blib/man3/.exists`, `cpan/Pod-Checker/blib/script/.exists`, `cpan/Pod-Checker/blib/script/podchecker`, `cpan/Pod-Checker/pm_to_blib`, `cpan/Pod-Checker/podchecker`, `cpan/Pod-Checker/podchecker.PL`, `cpan/Pod-Escapes/pm_to_blib`, `cpan/Pod-Perldoc/Makefile`, `cpan/Pod-Perldoc/blib/bin/.exists`, `cpan/Pod-Perldoc/blib/man1/.exists`, `cpan/Pod-Perldoc/blib/man3/.exists`, `cpan/Pod-Perldoc/blib/script/.exists`, `cpan/Pod-Perldoc/pm_to_blib`, `cpan/Pod-Simple/pm_to_blib`, `cpan/Pod-Usage/Makefile`, `cpan/Pod-Usage/Makefile.PL`, `cpan/Pod-Usage/blib/bin/.exists`, `cpan/Pod-Usage/blib/man1/.exists`, `cpan/Pod-Usage/blib/man3/.exists`, `cpan/Pod-Usage/blib/script/.exists`, `cpan/Pod-Usage/blib/script/pod2usage`, `cpan/Pod-Usage/pm_to_blib`, `cpan/Pod-Usage/pod2usage`, `cpan/Pod-Usage/pod2usage.PL`, `cpan/Scalar-List-Utils/ListUtil.c`, `cpan/Scalar-List-Utils/ListUtil.o`, `cpan/Scalar-List-Utils/Makefile`, `cpan/Scalar-List-Utils/Util.bs`, `cpan/Scalar-List-Utils/blib/bin/.exists`, `cpan/Scalar-List-Utils/blib/man1/.exists`, `cpan/Scalar-List-Utils/blib/man3/.exists`, `cpan/Scalar-List-Utils/blib/script/.exists`, `cpan/Scalar-List-Utils/pm_to_blib`, `cpan/Socket/Makefile`, `cpan/Socket/Socket.bs`, `cpan/Socket/Socket.c`, `cpan/Socket/Socket.o`, `cpan/Socket/blib/bin/.exists`, `cpan/Socket/blib/man1/.exists`, `cpan/Socket/blib/man3/.exists`, `cpan/Socket/blib/script/.exists`, `cpan/Socket/const-c.inc`, `cpan/Socket/const-xs.inc`, `cpan/Socket/pm_to_blib`, `cpan/Sys-Syslog/Makefile`, `cpan/Sys-Syslog/Syslog.bs`, `cpan/Sys-Syslog/Syslog.c`, `cpan/Sys-Syslog/Syslog.o`, `cpan/Sys-Syslog/blib/bin/.exists`, `cpan/Sys-Syslog/blib/man1/.exists`, `cpan/Sys-Syslog/blib/man3/.exists`, `cpan/Sys-Syslog/blib/script/.exists`, `cpan/Sys-Syslog/const-c.inc`, `cpan/Sys-Syslog/const-xs.inc`, `cpan/Sys-Syslog/macros.all`, `cpan/Sys-Syslog/pm_to_blib`, `cpan/Term-ANSIColor/pm_to_blib`, `cpan/Term-Cap/Makefile`, `cpan/Term-Cap/Makefile.PL`, `cpan/Term-Cap/blib/bin/.exists`, `cpan/Term-Cap/blib/man1/.exists`, `cpan/Term-Cap/blib/man3/.exists`, `cpan/Term-Cap/blib/script/.exists`, `cpan/Term-Cap/pm_to_blib`, `cpan/Term-Table/pm_to_blib`, `cpan/Test-Harness/Makefile`, `cpan/Test-Harness/Makefile.PL`, `cpan/Test-Harness/blib/bin/.exists`, `cpan/Test-Harness/blib/man1/.exists`, `cpan/Test-Harness/blib/man3/.exists`, `cpan/Test-Harness/blib/script/.exists`, `cpan/Test-Harness/pm_to_blib`, `cpan/Test-Simple/pm_to_blib`, `cpan/Test2-Suite/pm_to_blib`, `cpan/Text-Balanced/pm_to_blib`, `cpan/Text-ParseWords/pm_to_blib`, `cpan/Text-Tabs/pm_to_blib`, `cpan/Tie-RefHash/pm_to_blib`, `cpan/Time-Local/pm_to_blib`, `cpan/Time-Piece/Makefile`, `cpan/Time-Piece/Makefile.PL`, `cpan/Time-Piece/Piece.bs`, `cpan/Time-Piece/Piece.c`, `cpan/Time-Piece/Piece.o`, `cpan/Time-Piece/blib/bin/.exists`, `cpan/Time-Piece/blib/man1/.exists`, `cpan/Time-Piece/blib/man3/.exists`, `cpan/Time-Piece/blib/script/.exists`, `cpan/Time-Piece/pm_to_blib`, `cpan/Unicode-Collate/Collate.bs`, `cpan/Unicode-Collate/Collate.c`, `cpan/Unicode-Collate/Collate.o`, `cpan/Unicode-Collate/Makefile`, `cpan/Unicode-Collate/blib/bin/.exists`, `cpan/Unicode-Collate/blib/man1/.exists`, `cpan/Unicode-Collate/blib/man3/.exists`, `cpan/Unicode-Collate/blib/script/.exists`, `cpan/Unicode-Collate/pm_to_blib`, `cpan/Unicode-Collate/ucatbl.h`, `cpan/Win32API-File/ppport.h`, `cpan/autodie/pm_to_blib`, `cpan/bignum/Makefile`, `cpan/bignum/Makefile.PL`, `cpan/bignum/blib/bin/.exists`, `cpan/bignum/blib/man1/.exists`, `cpan/bignum/blib/man3/.exists`, `cpan/bignum/blib/script/.exists`, `cpan/bignum/pm_to_blib`, `cpan/experimental/pm_to_blib`, `cpan/libnet/Makefile`, `cpan/libnet/blib/bin/.exists`, `cpan/libnet/blib/man1/.exists`, `cpan/libnet/blib/man3/.exists`, `cpan/libnet/blib/script/.exists`, `cpan/libnet/pm_to_blib`, `cpan/parent/pm_to_blib`, `cpan/perlfaq/pm_to_blib`, `cpan/podlators/Makefile`, `cpan/podlators/blib/bin/.exists`, `cpan/podlators/blib/man1/.exists`, `cpan/podlators/blib/man1/pod2man.1`, `cpan/podlators/blib/man1/pod2text.1`, `cpan/podlators/blib/man3/.exists`, `cpan/podlators/blib/script/.exists`, `cpan/podlators/blib/script/pod2man`, `cpan/podlators/blib/script/pod2text`, `cpan/podlators/pm_to_blib`, `cpan/podlators/scripts/pod2man`, `cpan/podlators/scripts/pod2text`, `cpan/version/pm_to_blib`, `deb.o`, `dist/Attribute-Handlers/Makefile`, `dist/Attribute-Handlers/blib/bin/.exists`, `dist/Attribute-Handlers/blib/man1/.exists`, `dist/Attribute-Handlers/blib/man3/.exists`, `dist/Attribute-Handlers/blib/script/.exists`, `dist/Attribute-Handlers/pm_to_blib`, `dist/Carp/pm_to_blib`, `dist/Data-Dumper/Dumper.bs`, `dist/Data-Dumper/Dumper.c`, `dist/Data-Dumper/Dumper.o`, `dist/Data-Dumper/Makefile`, `dist/Data-Dumper/blib/bin/.exists`, `dist/Data-Dumper/blib/man1/.exists`, `dist/Data-Dumper/blib/man3/.exists`, `dist/Data-Dumper/blib/script/.exists`, `dist/Data-Dumper/pm_to_blib`, `dist/Data-Dumper/ppport.h`, `dist/Devel-PPPort/Makefile`, `dist/Devel-PPPort/PPPort.bs`, `dist/Devel-PPPort/PPPort.pm`, `dist/Devel-PPPort/RealPPPort.c`, `dist/Devel-PPPort/RealPPPort.o`, `dist/Devel-PPPort/RealPPPort.xs`, `dist/Devel-PPPort/blib/bin/.exists`, `dist/Devel-PPPort/blib/man1/.exists`, `dist/Devel-PPPort/blib/man3/.exists`, `dist/Devel-PPPort/blib/script/.exists`, `dist/Devel-PPPort/module2.o`, `dist/Devel-PPPort/module3.o`, `dist/Devel-PPPort/pm_to_blib`, 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[truncated 109900 bytes]

## Plan Pass

## Problem
Fixer observed `/usr/bin/perl` consuming CPU with samples in `Perl_runops_standard` and a short syscall signal of repeated `pselect6`, but the bundle has no Perl script entrypoint, command line, stack excerpt, meaningful strace body, or reproducer. `Perl_runops_standard` is the generic opcode loop, so it is not enough to identify a runtime defect.

## Evidence Confidence
inferred

## Proposed Subject
No source patch yet: report insufficient evidence for an upstream Perl runtime change and request/collect a reproducer or richer trace tying the busy polling to a specific Perl op, module, or script event loop.

## Patch Plan
Do not edit files in this pass. The likely touched areas would be `run.c` for `Perl_runops_standard` and `pp_sys.c`/`t/op/sselect.t` for core four-arg `select`, but the evidence does not show that core `select` is wrong rather than a Perl program repeatedly polling with a zero or expired timeout.

Upstream conventions found: `README` points patch authors to `pod/perlhack.pod`; `perlhack` says to base work on Perl’s `blead` branch and validate with `./Configure -des -Dusedevel` and `make test`. The local socket helper is `PerlSock_select` from `iperlsys.h`, and nearby C code uses Perl allocation/SV helpers such as `Newx`, `Safefree`, `SvGETMAGIC`, `SvPV_force_nomg_nolen`, and `SvSETMAGIC`; any future patch should keep those wrappers rather than raw libc or ad hoc SV handling.

No prior Fixer source patch is present beyond the baseline commit. If later evidence identifies a real core bug, prefer a bounded conditional/early-return style and local helper APIs; do not introduce awkward control flow such as avoidable `goto`.

## Risks
Changing Perl’s run loop or `select` implementation from profiler-only evidence is high blast radius and likely to alter correct user-space polling behavior. A mitigation such as sleeping/yielding in `Perl_runops_standard` would be semantically wrong and performance-sensitive. A `select` change without a reproducer could break platform compatibility around masks, magic, UTF-8 downgrading, and timeout handling.

## Validation
Before reporting any focused result, try the project-level entrypoint from the workspace root:

`./Configure -des -Dusedevel && make -j2 && make test_harness`

If that fails because Debian-source generated files or dependencies are missing, record the exact failure a

[truncated]

Issue page: /issues/019d4017-20f8-7752-9734-0bcd71623118. Issue JSON: /v1/issues/019d4017-20f8-7752-9734-0bcd71623118

ollama is stuck in a likely unclassified userspace loop: 12.27% of sampled CPU passed through unresolved offset, with repeated thread backtraces show 1 thread(s) around 0x000055c5c39ed143 in ?? () and 1 thread(s) around 0x000055c5c39ed143 in ?? ().

## 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 `local-executable-upstream-git`. 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): `cmake -S . -B build-fix -G Ninja && cmake --build build-fix && ctest --test-dir build-fix --output-on-failure`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has 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 `github.com_ollama_ollama` 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, 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 `local-executable-upstream-git`. 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.

Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `cmake -S . -B build-fix -G Ninja && cmake --build build-fix && ctest --test-dir build-fix --output-on-failure`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has 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 `github.com_ollama_ollama` 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. 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 `local-executable-upstream-git`. 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 `github.com_ollama_ollama` 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): `cmake -S . -B build-fix -G Ninja && cmake --build build-fix && ctest --test-dir build-fix --output-on-failure`. If the project-level command fails because dependencies or generated files are missing, 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

[truncated 365 bytes]

## Plan Pass

## Problem
Fixer observed `/usr/local/bin/ollama serve` with an indirect profiler signal: 54 threads, futex waits, process state sleeping, low sampled CPU around 0.4%, unresolved stripped frames, and no symbolized source hotspot. The raw investigation artifact directory referenced by `evidence.json` is not present, so the bundled summary cannot be tied to a specific Go function or runner path.

## Evidence Confidence
inferred

## Proposed Subject
No source patch yet: collect a symbolized `ollama serve` profile before changing scheduler or runner code.

## Patch Plan
Do not edit source in this pass. The evidence is profiler-only and classifies the loop as `unknown-userspace-loop` with confidence `0.42`, which is not enough for an upstream-ready bug fix.

Base any future patch on upstream `main`; the workspace is already on `main...origin/main`. Follow `CONTRIBUTING.md`: package-style subject, lowercase continuation title, and behavior-focused tests. Relevant local conventions/helpers found: `logutil.NewLogger`, `logutil.Trace`, `slog` structured logging, and `server/internal/internal/syncs.Group`; no file IO or process helper is relevant to the current evidence.

If additional evidence identifies a concrete scheduler/runner loop, inspect `cmd.RunServer`, `server.Serve`, `server/sched.go`, `llm/server.go`, and the active runner implementation first. Prefer a bounded structured-control fix over awkward retry `goto` flow. No prior Fixer patch is present in the workspace (`git diff` is empty), so there is nothing to replace.

## Risks
A speculative change to scheduler expiration, runner lifecycle, or background goroutine behavior would risk altering model unload timing, request cancellation, concurrency, or resource recovery without proving it addresses the observed process. The current futex-heavy sample may also be normal idle Go/runtime behavior.

## Validation
First try the project-level entrypoint from the workspace root:

```sh
cmake -S . -B build-fix -G Ninja && cmake --build build-fix && ctest --test-dir build-fix --output-on-failure
```

If that fails due to missing generated files or optional native dependencies, record the exact failure and then run the narrowest relevant check, likely `go test ./server ./llm ./cmd` or the package identified by the new symbolized hotspot.

Bounded independent reproduction attempt before any patch: run a locally built `ollama serve` with temporary `HOME`, `OLLAMA_MODELS`, and an unused localhost port, then sample CPU/thread state and, if available, a symbolized Go/pprof or perf profile. Only classify as reproduced if that command shows the same hot signal with a source-level hotspot.

## Patch Pass

Subject: diagnostics: require symbolized ollama serve profile

## Commit Message
No source patch is included. The collected signal is an unsymbolized profiler/strace sample of `ollama serve`, and it does not identify an upstream code path strongly enough for a pull-request-ready fix.

## Evidence Confidence
inferred

## Issue Connection
Fixer observed `/usr/local/bin/ollama serve` with 54 threads, repeated `futex(..., FUTEX_WAIT_PRIVATE, ...)` calls, process state `S (sleeping)`, and about 0.4% CPU. The hottest path was an unresolved offset in the stripped `ollama` binary, and the evidence classified the loop as `unknown-userspace-loop` with confidence `0.42`.

The likely root cause from the available perf, strace, and `/proc` evidence is not a proven busy loop in Ollama source. It looks more like many Go/runtime or worker threads blocked on futex waits, with a small amount of scheduler/runtime activity. Because the frames are unsymbolized and the raw investigation artifact directory is unavailable, I cannot tie the sample to `cmd.RunServer`, `server.Serve`, `server/sched.go`, `llm/server.go`, or a runner loop.

No code change was made. I followed the saved plan in `plan-output.txt`, which said not to patch without a symbolized hotspot. The expected effect is no behavior change; this avoids sending maintainers a speculative scheduler or runner lifecycle patch without source-level evidence.

Upstream conventions checked: repository branch is `main`, `CONTRIBUTING.md` asks for package-style lowercase commit subjects and behavior-focused tests, and `docs/development.md` documents `cmake`, `go run . serve`, and `go test ./...`. Relevant local patterns found include `logutil.NewLogger`, `logutil.Trace`, structured `slog`, and `server/internal/internal/syncs.Group`; no helper was applicable because no source API was introduced.

## Git Add Paths
None

## Validation
Attempted project-level validation from the workspace root:

```sh
cmake -S . -B build-fix -G Ninja && cmake --build build-fix && ctest --test-dir build-fix --output-on-failure
```

Result: failed during CMake configure. Exact blocker: `Could NOT find Vulkan (missing: glslc) (found version "1.4.341")`.

Attempted narrower relevant check:

```sh
GOCACHE=/tmp/ollama-go-build-cache GOPATH=/tmp/ollama-gopath GOTMPDIR=/tmp go test ./cmd ./server ./llm
```

Result: failed before compilation because dependencies were not cached and network is blocked. Exact blocker included `Get "https://proxy.golang.org/...": dial udp 127.0.0.53:53: socket: operation not permitted`.

Attempted bounded independent reproduction against the installed binary with temporary `HOME`, `OLLAMA_MODELS`, and nondefault `OLLAMA_HOST`:

```sh
HOME="$tmp/home" OLLAMA_MODELS="$tmp/models" OLLAMA_HOST=127.0.0.1:21435 /usr/local/bin/ollama serve
```

Result: blocked by sandbox networking before sampling. Exact blocker: `Error: listen tcp 127.0.0.1:21435: socket: operation not permitted`.

## Review Pass 1

RESULT: ok

The pass is acceptable as a no-patch diagnosis. The workspace has no source diff, which matches the `inferred` evidence level and the profiler-only evidence bundle. The response includes the required sections, does not invent a reproducer, reports the project-level CMake command and exact `glslc` blocker, and documents the narrower Go test and independent reproduction blockers.

It also names the upstream branch/conventions and relevant local helpers, and it keeps the causal claim appropriately cautious: futex waits plus low CPU and unresolved frames are not enough to justify a scheduler or runner source patch.

## Plan Pass

## Problem
Fixer observed `/usr/local/bin/ollama serve` with an indirect profiler signal: 54 threads, futex waits, process state sleeping, low sampled CPU around 0.4%, unresolved stripped frames, and no symbolized source hotspot. The raw investigation artifact directory referenced by `evidence.json` is not present, so the bundled summary cannot be tied to a specific Go function or runner path.

## Evidence Confidence
inferred

## Proposed Subject
No source patch yet: collect a symbolized `ollama serve` profile before changing scheduler or runner code.

## Patch Plan
Do not edit source in this pass. The evidence is profiler-only and classifies the loop as `unknown-userspace-loop` with confidence `0.42`, which is not enough for an upstream-ready bug fix.

Base any future patch on upstream `main`; the workspace is already on `main...origin/main`. Follow `CONTRIBUTING.md`: package-style subject, lowercase continuation title, and behavior-focused tests. Relevant local conventions/helpers found: `logutil.NewLogger`, `logutil.Trace`, `slog` structured logging, and `server/internal/internal/syncs.Group`; no file IO or process helper is relevant to the current evidence.

If additional evidence identifies a concrete scheduler/runner loop, inspect `cmd.RunServer`, `server.Serve`, `server/sched.go`, `llm/server.go`, and the active runner implementation first. Prefer a bounded structured-control fix over awkward retry `goto` flow. No prior Fixer patch is present in the workspace (`git diff` is empty), so there is nothing to replace.

## Risks
A speculative change to scheduler expiration, runner lifecycle, or background goroutine behavior would risk altering model unload timing, request cancellation, concurrency, or resource recovery without proving it addresses the observed process. The current futex-heavy sample may also be normal idle Go/runtime behavior.

## Validation
First try the project-level entrypoint from the workspace root:

```sh
cmake -S . -B build-fix -G Ninja && cmake --build build-fix && ctest --test-dir build-fix --output-on-failure
```

If that fails due to missing generated files or optional native dependencies, record the exact failure and then run the narrowest relevant check, likely `go test ./server ./llm ./cmd` or the package identified by the new symbolized hotspot.

Bounded independent reproduction attempt before any patch: run a l

[truncated]

Issue page: /issues/019dd7a7-430c-79a0-bc5b-7549a044b3fc. Issue JSON: /v1/issues/019dd7a7-430c-79a0-bc5b-7549a044b3fc

dockerd is stuck in a likely socket churn loop: 100.00% of sampled CPU passed through bpf_lsm_file_permission, with repeated thread backtraces show 1 thread(s) around 0x000056124fea7023 in ?? () and 1 thread(s) around 0x000056124fea7023 in ?? ().

## 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.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has 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 `docker.io` 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.

A previous Fixer patch attempt already exists for this issue. It was generated by Fixer `0.150.0`. Review that patch before changing code, improve it instead of starting blind, and clean up anything awkward or underexplained. In particular, remove avoidable `goto`, tighten the explanation of what the patch is doing, and make the resulting diff feel ready for upstream git review.
- Prior patch: `./prior-best.patch`
- Prior published session: `./prior-best-session.md`

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has 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 `docker.io` 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. 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 `docker.io` upstream patch, not just a Debian-local workaround. 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 captured `dockerd` with low CPU, sleeping state, many futex waits, and a profiler hot path in kernel `bpf_lsm_file_permission`. The bundle labels this as socket churn, but it does not include Go symbols or a reproducible containerd event-stream failure tying the signal to `engine/libcontainerd/remote/client.go`.

## Evidence Confidence
inferred

## Proposed Subject
No source patch: report insufficient evidence for dockerd socket-churn fix

## Patch Plan
Do not edit source in this pass. The prior Fixer patch adding a 100 ms event-stream restart delay should be replaced by a diagnosis/report plan: it changes timing/throttling behavior, and the available evidence does not reproduce the retry loop or analyze security impact.

If stronger evidence is collected later, target upstream `master` for Moby Engine, not a Debian-local workaround. Follow Moby conventions from `engine/CONTRIBUTING.md` and `engine/TESTING.md`: Go changes under `engine/`, `gofmt -s`, unit tests with `gotest.tools/assert`, and existing `containerd/log` logging. Relevant local patterns found include `waitServe` and `libcontainerd/supervisor/remote_daemon.go` timer loops; syscall helpers like `unix_noeintr` and `nlwrap` are not relevant to this gRPC/containerd path.

## Risks
A source patch based only on this evidence would present an inferred timing mitigation as a confirmed bug fix. It could also slow legitimate event-stream recovery or mask a kernel/LSM/containerd issue, since the hot symbol is kernel-side and the trace does not identify the daemon retry code.

## Validation
Before any future source patch, try the workspace-root Debian entrypoint: `dpkg-buildpackage -us -uc -b`. Then use focused engine validation such as `cd engine && TESTDIRS=./libcontainerd/remote TESTFLAGS='-run <new-test>' ./hack/test/unit`.

Bounded independent reproduction attempt: if a local `dockerd` is running, use a short `pgrep -a dockerd` plus `timeout 5 strace -f -tt -p <pid>` sample filtered to futex/socket/containerd IPC calls, and compare it with a controlled containerd event subscription failure. Do not claim `reproduced` unless that command or a focused test actually shows immediate repeated retries.

## Patch Pass

Subject: No source patch: report dockerd socket-churn evidence gap

## Commit Message
No source change is included. The collected `dockerd` evidence points to an indirect socket-churn signal, but it does not reproduce a daemon retry loop or identify Go symbols strongly enough to justify changing timing behavior upstream.

## Evidence Confidence
inferred

## Issue Connection
The likely root cause is not established from the collected data. Fixer observed `/usr/sbin/dockerd -H fd:// --containerd=/run/containerd/containerd.sock` sleeping with many futex waits, 0.1% CPU, and a perf hot path entirely attributed to kernel `bpf_lsm_file_permission`; the bundle labels the profile as socket churn, but the strace excerpt is dominated by futex waits and does not show a reproduced containerd event-subscription retry loop.

The prior Fixer patch throttled `engine/libcontainerd/remote/client.go` event-stream restarts. That is a plausible mitigation path because `processEventStream` can restart after a non-canceled subscription error, but it changes timing/throttling behavior. Under the requested safety bar, that needs reproduced evidence plus security-impact analysis before leaving a source diff. I therefore intentionally made no source changes and replaced the prior patch with this diagnosis.

For a future upstream patch, the target should be Moby Engine `master`, not Debian packaging. Relevant local conventions/helpers reviewed: `engine/CONTRIBUTING.md`, `engine/TESTING.md`, `containerd/log`, `waitServe`, and the timer loop in `libcontainerd/supervisor/remote_daemon.go`; syscall/netlink helpers such as `unix_noeintr` and `nlwrap` do not apply to this gRPC/containerd path.

## Git Add Paths
None

## Validation
- Ran `dpkg-buildpackage -us -uc -b` from the workspace root. It stopped before build/test at `dpkg-checkbuilddeps` due to missing dependencies, including `dh-golang`, `golang-any`, `go-md2man`, many Go library packages, and `gotestsum`.
- Ran `pgrep -a dockerd || true` for the bounded reproduction attempt. It found no local `dockerd`, so a short strace/perf comparison of the collected socket-churn signal was not possible.
- Ran `HOME=/tmp GOCACHE=/tmp/go-build TESTDIRS=./libcontainerd/remote TESTFLAGS='-run TestWaitServe -count=1' ./hack/test/unit` from `engine`. It resolved the package but failed because `gotestsum` is not installed.
- Ran `git diff --exit-code -- .`; workspace has no source diff.

## Review Pass 1

RESULT: ok

No blocking findings.

The author response is a no-patch diagnosis with `## Evidence Confidence` set to `inferred`, which matches the profiler/strace evidence and the security-sensitive timing/throttling constraint. `## Git Add Paths` is `None`, and the workspace has no source diff.

Validation is acceptable for a no-patch report: the workspace-root `dpkg-buildpackage -us -uc -b` entrypoint was attempted and the missing build dependencies were reported; a bounded local `dockerd` reproduction attempt was attempted and blocked by no running daemon; the focused unit entrypoint was attempted and blocked by missing `gotestsum`.

The maintainer-facing explanation correctly rejects the prior timing patch instead of presenting an inferred mitigation as PR-ready, names upstream `master`, and cites relevant Moby conventions/helpers.

## Plan Pass

## Problem
Fixer captured `dockerd` with low CPU, sleeping state, many futex waits, and a profiler hot path in kernel `bpf_lsm_file_permission`. The bundle labels this as socket churn, but it does not include Go symbols or a reproducible containerd event-stream failure tying the signal to `engine/libcontainerd/remote/client.go`.

## Evidence Confidence
inferred

## Proposed Subject
No source patch: report insufficient evidence for dockerd socket-churn fix

## Patch Plan
Do not edit source in this pass. The prior Fixer patch adding a 100 ms event-stream restart delay should be replaced by a diagnosis/report plan: it changes timing/throttling behavior, and the available evidence does not reproduce the retry loop or analyze security impact.

If stronger evidence is collected later, target upstream `master` for Moby Engine, not a Debian-local workaround. Follow Moby conventions from `engine/CONTRIBUTING.md` and `engine/TESTING.md`: Go changes under `engine/`, `gofmt -s`, unit tests with `gotest.tools/assert`, and existing `containerd/log` logging. Relevant local patterns found include `waitServe` and `libcontainerd/supervisor/remote_daemon.go` timer loops; syscall helpers like `unix_noeintr` and `nlwrap` are not relevant to this gRPC/containerd path.

## Risks
A source patch based only on this evidence would present an inferred timing mitigation as a confirmed bug fix. It could also slow legitimate event-stream recovery or mask a kernel/LSM/containerd issue, since the hot symbol is kernel-side and the trace does not identify the daemon retry code.

## Validation
Before any future source patch, try the workspace-root Debian entrypoint: `dpkg-buildpackage -us -uc -b`. Then use focused engine validation such as `cd engine && TESTDIRS=./libcontainerd/remote TESTFLAGS='-run <new-test>' ./hack/test/unit`.

Bounded independent reproduction attempt: if a local `dockerd` is running, use a short `pgrep -a dockerd` plus `timeout 5 strace -f -tt -p <pid>` sample filtered to futex/socket/containerd IPC calls, and compare it with a controlled containerd event subscription failure. Do not claim `reproduced` unless that command or a focused test actually shows immediate repeated retries.

## Patch Pass

Subject: No source patch: report dockerd socket-churn evidence gap

## Commit Message
No source change is included. The collected `dockerd` evidence points to an i

[truncated]

Issue page: /issues/019dfd63-6d80-7570-856f-df901ff2167f. Issue JSON: /v1/issues/019dfd63-6d80-7570-856f-df901ff2167f

smtpd is stuck in a likely unclassified userspace loop: 21.02% of sampled CPU passed through __memcg_slab_post_alloc_hook, with repeated thread backtraces show 1 thread(s) around 0x00007f059d1bc7d2 in ?? () from target:<path>.

## 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 `postfix` 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.

A previous Fixer patch attempt already exists for this issue. It was generated by Fixer `0.151.0`. Review that patch before changing code, improve it instead of starting blind, and clean up anything awkward or underexplained. In particular, remove avoidable `goto`, tighten the explanation of what the patch is doing, and make the resulting diff feel ready for upstream git review.
- Prior patch: `./prior-best.patch`
- Prior published session: `./prior-best-session.md`

Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has 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 `postfix` 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. 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 `postfix` 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 choos

[truncated 84 bytes]

## Plan Pass

## Problem
Fixer observed a low-confidence profiler signal for `smtpd`: one sampled process at 1.7% CPU, sleeping in `poll`, with a backtrace through `smtp_get()` / `vstring_get_flags_bound()` / `timed_read()`. The prior Fixer patch inferred an overlong SMTP command drain in `smtpd_chat_query_limit()`, but the evidence does not show an overlong command, client transcript, timeout, or reproducible runaway loop.

## Evidence Confidence
inferred

## Proposed Subject
No source patch: `smtpd` profiler signal needs a reproducer

## Patch Plan
Do not carry forward the prior source patch yet. It changes SMTP command-read behavior and touches the shared chat path used by SASL authentication continuations, making it authentication-sensitive without reproduced behavior or security-impact analysis.

Prepare a no-patch diagnosis/report instead, unless stronger evidence is collected before editing. The extra evidence needed is a bounded local reproduction that drives `smtpd` with an overlong command or slow unterminated command and demonstrates the same `smtp_get()` / `vstring_get_flags_bound()` CPU/wait signal, plus a clear before/after behavioral expectation.

If that reproduction succeeds in a later edit pass, improve the prior patch rather than starting blind: keep ordinary command reads bounded, preserve `SMTP_GET_FLAG_SKIP` only for callers that intentionally recover such as SASL continuation reads, use existing Postfix helpers (`smtp_get()`, `smtp_stream_setup()`, `smtpd_chat_reply()`, `msg_warn()`, `MAIL_ERROR_PROTOCOL`), follow K&R-style local definitions, and use a direct conditional instead of any avoidable `goto`.

No `CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, or `dev-docs/` file was found. Relevant local guidance is in `AAAREADME`, `TESTING`, `INSTALL`, and `README_FILES/*`; upstream review should target the default integration branch rather than treating the Debian source tree as the merge-request base.

## Risks
The prior patch would change malformed SMTP-session behavior from draining excess input to rejecting and disconnecting. That may be reasonable, but without a reproduced overlong-line failure it is speculative and may regress AUTH/SASL recovery semantics or pipelined-client handling.

## Validation
Before any future source patch, try the project-level entrypoint from the workspace root: `make makefiles shared=yes dynamicmaps=no` and `make`; then `make check` if available. If Berkeley DB or generated-file setup blocks that, record the exact failure and retry the documented non-Berkeley DB build form using `CCARGS='-DNO_DB'` with non-BDB default database/cache types.

Then run the narrowest relevant checks: `cd src/smtpd && make test` or `cd src/smtpd && make tests`, plus focused compile of `smtpd.c` and `smtpd_chat.c` if the full build is blocked.

Independent reproduction attempt required before editing: run a timeout-limited local `smtpd` session that sends more than `line_length_limit` bytes without LF or with a delayed LF, while collecting `strace`/backtrace/perf evidence. Do not claim `reproduced` unless that command shows the same failure signal.

## Patch Pass

Subject: no source patch: smtpd profiler signal needs a reproducer

## Commit Message
No source patch is proposed. The collected signal shows `smtpd` waiting in the SMTP input path, but it does not establish a specific overlong-command bug or a safe authentication-adjacent behavior change.

## Evidence Confidence
inferred

## Issue Connection
Fixer collected profiler and trace evidence for one `smtpd` process: 1.7% CPU, process state `S (sleeping)`, `wchan` in `poll_schedule_timeout`, one `restart_syscall` sample, and a backtrace through `timed_read()`, `vstring_get_flags_bound()`, `smtp_get_noexcept()`, and `smtp_get()`.

The likely area is SMTP command input handling. The previous Fixer patch inferred that `SMTP_GET_FLAG_SKIP` could spend time draining an overlong command, but the evidence bundle does not include an SMTP transcript, an overlong input sample, a timeout, or an independently reproduced runaway loop. That patch also changes `smtpd_chat_query()` / `smtpd_chat_query_limit()` behavior in a path used by SASL authentication continuations, so it is authentication-sensitive and needs reproduced evidence plus security-impact analysis before it is upstreamable.

I made no source change. The expected effect is that this proposal avoids presenting an inferred mitigation as a confirmed Postfix bug fix.

Local conventions/helpers inspected: `smtp_get()`, `SMTP_GET_FLAG_SKIP`, `smtp_stream_setup()`, `smtpd_chat_reply()`, `msg_warn()`, `MAIL_ERROR_PROTOCOL`, and Postfix K&R-style definitions. No `CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, or `dev-docs/` was found; relevant local guidance is `AAAREADME`, `TESTING`, `INSTALL`, and `README_FILES/*`. Upstream review should target the default integration branch, not the Debian source snapshot as a Debian-local workaround.

## Git Add Paths
None

## Validation
`make makefiles shared=yes dynamicmaps=no`: failed because `db.h` was missing: `No <db.h> include file found. Install the appropriate db*-devel package first.`

`make makefiles shared=yes dynamicmaps=no CCARGS='-DNO_DB' default_database_type=texthash default_cache_db_type=texthash`: succeeded.

`make -j2` after that: failed on missing NIS/RPC headers: `rpcsvc/ypclnt.h: No such file or directory`.

`make makefiles shared=yes dynamicmaps=no CCARGS='-DNO_DB -DNO_NIS -DNO_NISPLUS' default_database_type=texthash default_cache_db_type=texthash && make -j2`: completed, though the sandbox printed `./postconf: fatal: socket: Operation not permitted` while generating defaults.

`make check`: failed because there is no `check` target.

`make -C src/smtpd test`: failed in existing test code because `smtpd_peer_test.c` calls `exit()` without a visible declaration under the test warning flags.

Bounded reproduction attempt: ran a timeout-limited local `smtpd` command with an overlong unterminated `EHLO` input. It exited without a useful SMTP transcript and did not reproduce the collected failure signal. A `strace` follow-up was blocked by sandbox ptrace restrictions: `PTRACE_TRACEME: Operation not permitted` / `ptrace(PTRACE_SEIZE): Operation not permitted`.

Workspace cleanup: `make tidy` exited on read-only `.git` chmod attempts, but it removed generated build outputs; `git status --short` is clean.

## Review Pass 1

RESULT: ok

No source diff is present, and the author correctly refused to carry forward an inferred source patch in an authentication-adjacent `smtpd` input path without reproduced evidence or security-impact analysis.

The response includes the required `## Evidence Confidence` value, keeps confidence at `inferred`, does not invent a reproducer, names the prior Fixer patch as speculative, reports project-level build attempts before focused checks, and records exact validation blockers. The workspace is clean.

## Plan Pass

## Problem
Fixer observed a low-confidence profiler signal for `smtpd`: one sampled process at 1.7% CPU, sleeping in `poll`, with a backtrace through `smtp_get()` / `vstring_get_flags_bound()` / `timed_read()`. The prior Fixer patch inferred an overlong SMTP command drain in `smtpd_chat_query_limit()`, but the evidence does not show an overlong command, client transcript, timeout, or reproducible runaway loop.

## Evidence Confidence
inferred

## Proposed Subject
No source patch: `smtpd` profiler signal needs a reproducer

## Patch Plan
Do not carry forward the prior source patch yet. It changes SMTP command-read behavior and touches the shared chat path used by SASL authentication continuations, making it authentication-sensitive without reproduced behavior or security-impact analysis.

Prepare a no-patch diagnosis/report instead, unless stronger evidence is collected before editing. The extra evidence needed is a bounded local reproduction that drives `smtpd` with an overlong command or slow unterminated command and demonstrates the same `smtp_get()` / `vstring_get_flags_bound()` CPU/wait signal, plus a clear before/after behavioral expectation.

If that reproduction succeeds in a later edit pass, improve the prior patch rather than starting blind: keep ordinary command reads bounded, preserve `SMTP_GET_FLAG_SKIP` only for callers that intentionally recover such as SASL continuation reads, use existing Postfix helpers (`smtp_get()`, `smtp_stream_setup()`, `smtpd_chat_reply()`, `msg_warn()`, `MAIL_ERROR_PROTOCOL`), follow K&R-style local definitions, and use a direct conditional instead of any avoidable `goto`.

No `CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, or `dev-docs/` file was found. Relevant local guidance is in `AAAREADME`, `TESTING`, `INSTALL`, and `README_FILES/*`; upstream review should target the default integration branch rather than treating the Debian source tree as the merge-request base.

## Risks
The prior patch would change malformed SMTP-session behavior from draining excess input to rejecting and disconnecting. That may be reasonable, but without a reproduced overlong-line failure it is speculative and may regress AUTH/SASL recovery semantics or pipelined-client handling.

## Validation
Before any future source patch, try the project-level entrypoint from the workspace root: `make makefiles shared=yes

[truncated]

Issue page: /issues/019e23ec-83a0-7823-9092-6f1fcbeea250. Issue JSON: /v1/issues/019e23ec-83a0-7823-9092-6f1fcbeea250

sshd-auth is stuck in a likely timer churn loop: 100.00% of sampled CPU passed through apparmor_socket_recvmsg, with repeated thread backtraces show 1 thread(s) around 0x00007fa460a9a7d2 in ?? () from target:<path>.

## 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): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has 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 `openssh` 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.

A previous Fixer patch attempt already exists for this issue. It was generated by Fixer `0.150.0`. Review that patch before changing code, improve it instead of starting blind, and clean up anything awkward or underexplained. In particular, remove avoidable `goto`, tighten the explanation of what the patch is doing, and make the resulting diff feel ready for upstream git review.
- Prior patch: `./prior-best.patch`
- Prior published session: `./prior-best-session.md`

Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has 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 `openssh` 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. 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 `openssh` 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): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, 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

[truncated 33 bytes]

## Plan Pass

## Problem
Fixer observed `sshd-auth` in authentication timing code with a `read(3, ...)` taking ~2.055919s followed by `clock_nanosleep(...)` for ~2.025614s. In `auth2.c`, failed non-`none` authentication calls `ensure_minimum_time_since()`, which doubles a 5 to 9.2ms per-user delay until it exceeds elapsed time, so already-slow authentication work can be followed by another multi-second sleep.

## Evidence Confidence
observed

## Proposed Subject
`auth2: do not amplify failed-auth delay after slow authentication`

## Patch Plan
Replace the prior Fixer patch with the same narrow upstream-style change, but keep the explanation explicitly security/timing scoped: adjust only `ensure_minimum_time_since()` so it returns when `elapsed >= seconds` and otherwise sleeps for `seconds - elapsed`. This preserves the intended minimum failed-auth delay without using the helper as an exponential backoff.

Do not add `goto` or broader auth/monitor control-flow changes. Follow local conventions in `auth2.c`: `monotime_double()`, `debug3_f()`, `fatal_f()`, `xmalloc()`, `freezero()`, `ssh_digest_memory()`, and portable `nanosleep()` through openbsd-compat. I found only `README.md` among the requested contribution/style docs. `monitor.c` has a maintainer note, `XXX move delays to monitor and remove`, but no existing helper that replaces this local delay function.

Base the maintainer-facing patch against the upstream-style `master` branch present in the workspace, not as a Debian-local workaround.

## Risks
This touches authentication timing behavior, so validation must show the old bounded-delay calculation and analyze timing impact. The intended security property is a small per-user minimum delay for failed authentication; the change should preserve that floor while removing amplification after a backend or monitor round trip has already exceeded it. Risk remains that upstream intended the doubling as deliberate throttling, so the final explanation must avoid claiming a confirmed live bug beyond Fixer’s observed trace unless a live reproduction is obtained.

## Validation
First try the project-level entrypoint from the workspace root: `./configure && make`.

If that fails, report the exact command and blocker, then run the narrowest reproducible build such as `autoreconf && ./configure && make auth2.o` or `make sshd-auth` in a temporary clean copy if needed to avoid generated-file churn.

Also run a bounded independent reproduction of the collected timing signal: calculate old vs. patched `ensure_minimum_time_since()` behavior using the evidence values (`elapsed=2.055919s`, requested delay in the 0.005 to 0.0092s range) and confirm old code computes an additional ~2.0s sleep while patched code computes none. If no live sshd-auth reproduction is run, final confidence remains `observed` and the final `## Issue Connection` must say Fixer observed the trace and it was not independently reproduced.

## Patch Pass

Subject: diagnosis: defer failed-auth delay change pending reproduction

## Commit Message
No source change is proposed yet. The prior patch targets failed-authentication timing in `auth2.c`, but this is authentication throttling behavior and needs reproduced evidence plus security-impact review before an upstream source diff is safe to publish.

## Evidence Confidence
observed

## Issue Connection
Fixer observed `sshd-auth` with trace evidence: `/proc` showed the process sleeping in `unix_stream_read_generic`, perf attributed sampled time to socket receive handling, and strace showed a `read(3, ...)` taking about 2.055919s followed by `clock_nanosleep(...)` for about 2.025614s. This was observed by Fixer and not independently reproduced as a live sshd session.

The likely code-level cause is `ensure_minimum_time_since()` in `auth2.c`: after failed non-`none` authentication, it doubles a requested 5 to 9.2ms per-user delay until it exceeds elapsed authentication time. That can amplify already-slow authentication work into another timer sleep.

I reviewed the prior Fixer patch, which would make the helper return when elapsed time already satisfies the requested minimum. That change is small and plausible, but I did not apply it because the updated authoring requirements classify authentication timing/throttling changes as security-sensitive and require reproduced evidence before leaving a source diff.

The expected next step is a human-reviewed reproduction of a failed authentication path showing the extra sleep in a controlled sshd-auth run, followed by explicit review that preserving the small minimum failure delay while removing elapsed-time amplification does not weaken intended throttling. I found only `README.md` among the requested contribution/style docs; the workspace is on `master`; relevant local conventions/helpers are `monotime_double()`, `debug3_f()`, `fatal_f()`, `xmalloc()`, `freezero()`, `ssh_digest_memory()`, and portable `nanosleep()` via openbsd-compat. `monitor.c` also notes `XXX move delays to monitor and remove`, but there is no existing replacement helper for this delay path.

## Git Add Paths
None

## Validation
Required project-level command from workspace root:
`./configure && make`

Result:
failed immediately with `configure: error: ./configure.ac newer than configure, run autoreconf`.

Focused clean-checkout compile in a temporary copy:
`autoreconf && ./configure && make auth2.o`

Result:
passed; `auth2.c` compiled successfully.

Bounded timing calculation using evidence-shaped values:
`elapsed=2.055919 requested=0.005305 old_sleep=0.660241 new_sleep=0.000000`

That confirms the old helper can compute an additional sleep after elapsed authentication time already exceeds the requested floor, but it is only an arithmetic reproduction of the helper behavior, not a live reproduction of the observed sshd-auth trace.

## Review Pass 1

RESULT: ok

The author left no source diff, which matches the security-sensitive authentication timing requirement for observed-only evidence. `## Git Add Paths` is `None`, the workspace is clean, validation includes the required `./configure && make` attempt with the exact blocker, and the response clearly distinguishes the arithmetic timing check from a live reproduction.

## Plan Pass

## Problem
Fixer observed `sshd-auth` in authentication timing code with a `read(3, ...)` taking ~2.055919s followed by `clock_nanosleep(...)` for ~2.025614s. In `auth2.c`, failed non-`none` authentication calls `ensure_minimum_time_since()`, which doubles a 5 to 9.2ms per-user delay until it exceeds elapsed time, so already-slow authentication work can be followed by another multi-second sleep.

## Evidence Confidence
observed

## Proposed Subject
`auth2: do not amplify failed-auth delay after slow authentication`

## Patch Plan
Replace the prior Fixer patch with the same narrow upstream-style change, but keep the explanation explicitly security/timing scoped: adjust only `ensure_minimum_time_since()` so it returns when `elapsed >= seconds` and otherwise sleeps for `seconds - elapsed`. This preserves the intended minimum failed-auth delay without using the helper as an exponential backoff.

Do not add `goto` or broader auth/monitor control-flow changes. Follow local conventions in `auth2.c`: `monotime_double()`, `debug3_f()`, `fatal_f()`, `xmalloc()`, `freezero()`, `ssh_digest_memory()`, and portable `nanosleep()` through openbsd-compat. I found only `README.md` among the requested contribution/style docs. `monitor.c` has a maintainer note, `XXX move delays to monitor and remove`, but no existing helper that replaces this local delay function.

Base the maintainer-facing patch against the upstream-style `master` branch present in the workspace, not as a Debian-local workaround.

## Risks
This touches authentication timing behavior, so validation must show the old bounded-delay calculation and analyze timing impact. The intended security property is a small per-user minimum delay for failed authentication; the change should preserve that floor while removing amplification after a backend or monitor round trip has already exceeded it. Risk remains that upstream intended the doubling as deliberate throttling, so the final explanation must avoid claiming a confirmed live bug beyond Fixer’s observed trace unless a live reproduction is obtained.

## Validation
First try the project-level entrypoint from the workspace root: `./configure && make`.

If that fails, report the exact command and blocker, then run the narrowest reproducible build such as `autoreconf && ./configure && make auth2.o` or `make sshd-auth` in a temporary clean copy if needed t

[truncated]

Issue page: /issues/019dfcf9-7385-7c01-ba59-9fce98cd0a8f. Issue JSON: /v1/issues/019dfcf9-7385-7c01-ba59-9fce98cd0a8f

sshd-auth is stuck in a likely busy poll loop: 100.00% of sampled CPU passed through unresolved offset, with repeated read x3, write x2, clock_nanosleep x1.

## 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): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has 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 `openssh` 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.

A previous Fixer patch attempt already exists for this issue. It was generated by Fixer `0.150.0`. Review that patch before changing code, improve it instead of starting blind, and clean up anything awkward or underexplained. In particular, remove avoidable `goto`, tighten the explanation of what the patch is doing, and make the resulting diff feel ready for upstream git review.
- Prior patch: `./prior-best.patch`
- Prior published session: `./prior-best-session.md`

Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has 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 `openssh` 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. 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 `openssh` 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): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, 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

[truncated 33 bytes]

## Plan Pass

## Problem
Fixer flagged `sshd-auth` as a likely busy-poll runaway, but the bundle does not prove that behavior. The sampled process had `max_cpu_percent: 0.1`, was sleeping in `unix_stream_read_generic`, and the captured strace shows one `ppoll`, an `ECONNRESET`, a monitor log write, and process exit.

## Evidence Confidence
inferred

## Proposed Subject
No patch: diagnose inconclusive `sshd-auth` busy-poll evidence

## Patch Plan
Do not prepare a source patch in this pass. A prior Fixer patch adds `LoginGraceTime` alarm handling to `sshd-auth.c`, but that changes authentication timing/throttling behavior. Under the security-sensitive rule, that patch should be replaced by a no-patch diagnosis unless a bounded reproduction proves the missing timer or a loop.

Relevant upstream conventions/helpers found: `ssh_signal`, `fatal`, `_exit(EXIT_LOGIN_GRACE)`, `setitimer`, `timerclear`, `arc4random_uniform`, `ppoll`, `sshbuf`, `atomicio`, `xcalloc`, and `openbsd-compat` shims. `README.md` was the only contribution/style doc found; no `CONTRIBUTING`, `HACKING`, `README-hacking`, `docs/`, or `dev-docs/` were present. Workspace branch is `master`; upstream-facing work should target the default integration branch, not a Debian-only workaround.

## Risks
A timer patch could alter pre-authentication timeout semantics without a reproduced failure or security impact analysis. The observed trace may simply be normal pre-auth disconnect handling after a client reset.

The prior Fixer patch should not be carried forward as-is because it presents an authentication timing change from indirect profiler evidence.

## Validation
Before any future source patch, try the project-level entrypoint from the workspace root:

```sh
./configure && make
```

Then run a bounded independent reproduction attempt: start a temporary local `sshd` with `LoginGraceTime 1`, connect and stall pre-auth, and observe whether `sshd-auth` exits by grace timeout or remains alive/spinning.

Only if that reproduces the failure should a focused patch proceed; otherwise report the exact reproduction result and keep this as a no-patch diagnosis.

## Patch Pass

Subject: no patch: diagnose inconclusive sshd-auth busy-poll trace

## Commit Message
No source change is included. The collected `sshd-auth` evidence is an indirect profiler/strace signal, and the prior proposed fix would change pre-authentication timing behavior without a reproduced failure or security-impact analysis.

## Evidence Confidence
inferred

## Issue Connection
Fixer observed an `sshd-auth: root [net]` process classified as a likely busy-poll loop, with a short syscall sequence containing `clock_nanosleep`, `write`, and `ppoll`. The same evidence also shows `max_cpu_percent: 0.1`, process state `S (sleeping)`, kernel wait channel `unix_stream_read_generic`, and a 10-line strace ending in `ECONNRESET` followed by process exit.

The likely root cause cannot be established from this bundle. The trace is consistent with a transient pre-authentication connection reset or authentication delay path, not a proven runaway loop. I reviewed the prior Fixer patch, which adds a `LoginGraceTime` alarm to `sshd-auth.c`, but that touches authentication timing/throttling and therefore needs reproduced evidence plus security-impact analysis before it is suitable as an upstream source diff.

No code change was made. The expected effect is no runtime behavior change; this leaves a diagnosis for human review instead of shipping a speculative security-sensitive timing change.

Relevant local conventions/helpers found include `ssh_signal`, `fatal`, `_exit(EXIT_LOGIN_GRACE)`, `setitimer`, `timerclear`, `arc4random_uniform`, `ppoll`, `sshbuf`, `atomicio`, `xcalloc`, and `openbsd-compat` shims. `README.md` was the only contribution/style document found. The workspace branch is `master`, matching the expected upstream integration branch choice.

## Git Add Paths
None

## Validation
`./configure && make` failed from the workspace root:

```text
configure: error: ./configure.ac newer than configure, run autoreconf
```

Focused compile attempt also failed because configuration output is absent:

```sh
make sshd-auth.o
```

```text
includes.h:19:10: fatal error: config.h: No such file or directory
```

Bounded independent runtime smoke was attempted with installed `/usr/sbin/sshd`, `/usr/lib/openssh/sshd-session`, and `/usr/lib/openssh/sshd-auth`, using a temporary localhost config with `LoginGraceTime 1`. It was blocked before reproduction by sandbox networking:

```text
socket: Operation not permitted
Cannot bind any address.
```

`git status --short` and `git diff -- .` showed no workspace source changes.

## Review Pass 1

RESULT: ok

The author response is acceptable as a no-patch diagnosis. The workspace has no source diff, `## Git Add Paths` is `None`, and the `inferred` evidence classification matches the profiler/strace-only bundle.

The response correctly rejects the prior `LoginGraceTime` timer patch because it changes authentication timing behavior without reproduced evidence or security-impact analysis. Validation is also adequate for a no-patch pass: it attempted `./configure && make`, reported the exact generated-file blocker, tried a focused compile, and documented the runtime smoke blocker.

## Plan Pass

## Problem
Fixer flagged `sshd-auth` as a likely busy-poll runaway, but the bundle does not prove that behavior. The sampled process had `max_cpu_percent: 0.1`, was sleeping in `unix_stream_read_generic`, and the captured strace shows one `ppoll`, an `ECONNRESET`, a monitor log write, and process exit.

## Evidence Confidence
inferred

## Proposed Subject
No patch: diagnose inconclusive `sshd-auth` busy-poll evidence

## Patch Plan
Do not prepare a source patch in this pass. A prior Fixer patch adds `LoginGraceTime` alarm handling to `sshd-auth.c`, but that changes authentication timing/throttling behavior. Under the security-sensitive rule, that patch should be replaced by a no-patch diagnosis unless a bounded reproduction proves the missing timer or a loop.

Relevant upstream conventions/helpers found: `ssh_signal`, `fatal`, `_exit(EXIT_LOGIN_GRACE)`, `setitimer`, `timerclear`, `arc4random_uniform`, `ppoll`, `sshbuf`, `atomicio`, `xcalloc`, and `openbsd-compat` shims. `README.md` was the only contribution/style doc found; no `CONTRIBUTING`, `HACKING`, `README-hacking`, `docs/`, or `dev-docs/` were present. Workspace branch is `master`; upstream-facing work should target the default integration branch, not a Debian-only workaround.

## Risks
A timer patch could alter pre-authentication timeout semantics without a reproduced failure or security impact analysis. The observed trace may simply be normal pre-auth disconnect handling after a client reset.

The prior Fixer patch should not be carried forward as-is because it presents an authentication timing change from indirect profiler evidence.

## Validation
Before any future source patch, try the project-level entrypoint from the workspace root:

```sh
./configure && make
```

Then run a bounded independent reproduction attempt: start a temporary local `sshd` with `LoginGraceTime 1`, connect and stall pre-auth, and observe whether `sshd-auth` exits by grace timeout or remains alive/spinning.

Only if that reproduces the failure should a focused patch proceed; otherwise report the exact reproduction result and keep this as a no-patch diagnosis.

## Patch Pass

Subject: no patch: diagnose inconclusive sshd-auth busy-poll trace

## Commit Message
No source change is included. The collected `sshd-auth` evidence is an indirect profiler/strace signal, and the prior proposed fix would change pre-authen

[truncated]

Issue page: /issues/019e1519-78c6-7813-bebb-aeb6177e1897. Issue JSON: /v1/issues/019e1519-78c6-7813-bebb-aeb6177e1897

sshd-session is stuck in a likely unclassified userspace loop: 21.93% of sampled CPU passed through locks_remove_file, with repeated thread backtraces show 1 thread(s) around 0x00007f726ec9a7d2 in ?? () from target:<path>.

## 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): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `openssh` 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.

A previous Fixer patch attempt already exists for this issue. It was generated by Fixer `0.151.0`. Review that patch before changing code, improve it instead of starting blind, and clean up anything awkward or underexplained. In particular, remove avoidable `goto`, tighten the explanation of what the patch is doing, and make the resulting diff feel ready for upstream git review.
- Prior patch: `./prior-best.patch`
- Prior published session: `./prior-best-session.md`

Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `openssh` 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 `openssh` 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): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, 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 `sshd-session` as a runaway CPU process, but the evidence shows a process sleeping in `poll`/`restart_syscall`, `wchan=poll_schedule_timeout`, one strace line over 5 seconds, and only `0.1%` total sampled CPU. The hot symbols are kernel/loader-side, not a symbolized OpenSSH userspace loop.

## Evidence Confidence
inferred

## Proposed Subject
No source patch: report insufficient evidence for an OpenSSH `sshd-session` runaway loop.

## Patch Plan
Do not edit source. This path is security-sensitive because `sshd-session` handles authenticated server sessions and event-loop timing; changing it without a reproduced behavior and security-impact analysis would be speculative.

Repository/style scan found `README.md` build guidance and local conventions/helpers including `ptimeout_*` for `poll`/`ppoll` deadlines, OpenSSH logging/allocation helpers such as `fatal_f`, `fatal_fr`, `error_f`, `debug`, `xcalloc`, and channel/event-loop helpers in `serverloop.c` and `channels.c`. No separate `CONTRIBUTING`, `HACKING`, `docs/`, or `dev-docs/` file was found.

The relevant code path is `server_loop2()` calling `wait_until_can_do_something()`, which prepares channel poll fds, applies `ptimeout_*` deadlines, and blocks in `ppoll`. That matches the collected sleeping-in-poll signal. No relevant local helper appears missing.

The prior Fixer artifact should be replaced by a clean no-source diagnosis: its session summary reached the same no-patch conclusion, but `prior-best.patch` contains an unrelated/generated-looking `buildpkg.sh` addition and should not be carried forward.

If stronger evidence later identifies a real busy loop, the follow-up patch should be narrow, use the existing `ptimeout_*`/channel helpers, and prefer simple bounded conditionals over avoidable `goto`.

## Risks
A speculative source change could alter SSH session timing, child collection, keepalive handling, or channel behavior without a demonstrated OpenSSH defect. The current evidence may describe an idle authenticated session or kernel/file-descriptor cleanup activity outside OpenSSH userspace.

## Validation
First try the project-level entrypoint from the workspace root: `./configure && make`. If it fails because generated files or dependencies are missing, record the exact command and failure reason, then run the narrowest reproducible check, likely `autoreconf && ./configure && make sshd-session`.

Bounded independent reproduction attempt: run `timeout 5s ./sshd-session` after build and confirm only the expected direct-execution fatal path. Do not claim `reproduced` unless a controlled command actually shows a CPU-hot loop or repeated event-loop wakeups matching the bundle.

## Patch Pass

Subject: Diagnose sshd-session poll sample as insufficient for patch

## Commit Message
No source change is proposed. The collected perf, strace, and `/proc` data point to `sshd-session` sleeping in its normal event wait, not to a demonstrated OpenSSH userspace busy loop.

Changing server session handling or event-loop timing without reproduced evidence would be security-sensitive and speculative.

## Evidence Confidence
inferred

## Issue Connection
Fixer collected a short profile for `sshd-session` with kernel hot symbols including `locks_remove_file`, one strace line showing `restart_syscall(<... resuming interrupted poll ...>)`, `/proc` state `S (sleeping)`, `wchan=poll_schedule_timeout`, and only `0.1%` total CPU across sampled `sshd-session` processes.

The likely root cause is not an identified OpenSSH loop. The evidence matches OpenSSH’s normal server-session wait path: `server_loop2()` calls `wait_until_can_do_something()`, which prepares channel poll fds, applies `ptimeout_*` deadlines, and blocks in `ppoll`. The profile does not show repeated OpenSSH userspace frames or a tight wakeup loop.

No source change was made. This follows the saved no-patch plan. I also rejected the prior Fixer patch artifact because it adds an unrelated/generated-looking `buildpkg.sh` file rather than addressing the collected `sshd-session` signal.

Local conventions checked: `README.md` build guidance, `ptimeout_*` poll timeout helpers, channel event-loop helpers, and OpenSSH logging/allocation helpers such as `fatal_f`, `fatal_fr`, `error_f`, `debug`, and `xcalloc`. No relevant missing helper was found. The expected effect is to avoid sending an upstream patch that could alter SSH authentication/session timing based only on indirect profiler evidence.

## Git Add Paths
None

## Validation
`./configure && make` failed from the workspace root with:
`configure: error: ./configure.ac newer than configure, run autoreconf`

Focused fallback was run in a temporary copy to avoid changing generated files in the workspace:
`autoreconf && ./configure && make sshd-session`

That completed successfully and linked `sshd-session`.

Independent bounded reproduction attempt:
`timeout 5s /tmp/openssh-fixer.frcUSI/sshd-session; printf 'exit=%s\n' "$?"`

Result:
`sshd-session should not be executed directly`
`exit=255`

This smoke check did not reproduce a CPU-hot loop. A faithful reproduction would require a controlled authenticated `sshd-session` path, which is security-sensitive and was not safe to invent from the evidence. The workspace remained clean.

## Review Pass 1

RESULT: ok

The current workspace has no source diff, which is appropriate for this evidence level. The author output uses `inferred`, avoids a source change in security-sensitive `sshd-session`/event-loop code, and does not overclaim reproduction.

Validation is acceptable: it attempted `./configure && make`, reported the exact generated-file blocker, then ran a focused `autoreconf && ./configure && make sshd-session` fallback in a temporary copy. The direct `sshd-session` smoke check did not claim to reproduce the CPU signal.

The explanation is maintainer-readable and ties the evidence to the normal `server_loop2()`/`wait_until_can_do_something()` `ppoll` wait path, names local helpers such as `ptimeout_*`, and correctly rejects the prior unrelated `buildpkg.sh` patch artifact.

## Plan Pass

## Problem
Fixer flagged `sshd-session` as a runaway CPU process, but the evidence shows a process sleeping in `poll`/`restart_syscall`, `wchan=poll_schedule_timeout`, one strace line over 5 seconds, and only `0.1%` total sampled CPU. The hot symbols are kernel/loader-side, not a symbolized OpenSSH userspace loop.

## Evidence Confidence
inferred

## Proposed Subject
No source patch: report insufficient evidence for an OpenSSH `sshd-session` runaway loop.

## Patch Plan
Do not edit source. This path is security-sensitive because `sshd-session` handles authenticated server sessions and event-loop timing; changing it without a reproduced behavior and security-impact analysis would be speculative.

Repository/style scan found `README.md` build guidance and local conventions/helpers including `ptimeout_*` for `poll`/`ppoll` deadlines, OpenSSH logging/allocation helpers such as `fatal_f`, `fatal_fr`, `error_f`, `debug`, `xcalloc`, and channel/event-loop helpers in `serverloop.c` and `channels.c`. No separate `CONTRIBUTING`, `HACKING`, `docs/`, or `dev-docs/` file was found.

The relevant code path is `server_loop2()` calling `wait_until_can_do_something()`, which prepares channel poll fds, applies `ptimeout_*` deadlines, and blocks in `ppoll`. That matches the collected sleeping-in-poll signal. No relevant local helper appears missing.

The prior Fixer artifact should be replaced by a clean no-source diagnosis: its session summary reached the same no-patch conclusion, but `prior-best.patch` contains an unrelated/generated-looking `buildpkg.sh` addition and should not be carried forward.

If stronger evidence later identifies a real busy loop, the follow-up patch should be narrow, use the existing `ptimeout_*`/channel helpers, and prefer simple bounded conditionals over avoidable `goto`.

## Risks
A speculative source change could alter SSH session timing, child collection, keepalive handling, or channel behavior without a demonstrated OpenSSH defect. The current evidence may describe an idle authenticated session or kernel/file-descriptor cleanup activity outside OpenSSH userspace.

## Validation
First try the project-level entrypoint from the workspace root: `./configure && make`. If it fails because generated files or dependencies are missing, record the exact command and failure reason, then run the narrowest reproducible check, likely `autorecon

[truncated]

Issue page: /issues/019e6049-7500-76f3-8131-a20112312129. Issue JSON: /v1/issues/019e6049-7500-76f3-8131-a20112312129

dockerd is stuck in a likely socket churn loop: 34.73% of sampled CPU passed through mem_cgroup_handle_over_high, with repeated thread backtraces show 1 thread(s) around 0x000056124fea7023 in ?? () and 1 thread(s) around 0x000056124fea7023 in ?? ().

## 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.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `docker.io` 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.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `docker.io` 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 `docker.io` upstream patch, not just a Debian-local workaround. 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 `dockerd` sleeping with many threads blocked in futex waits, low CPU (`0.1%`), a kernel hot path in `mem_cgroup_handle_over_high`, and an automated `socket-churn` classification. The available backtraces are unsymbolized, the raw investigation files are not present in this workspace, and no concrete Docker command, API request, or user-visible failure is provided.

## Evidence Confidence
observed

## Proposed Subject
No source patch yet: diagnose and report the indirect `dockerd` profiler signal until symbolized/source-level evidence identifies a Moby bug. A source patch would only be planned after collecting extra evidence that maps the observed futex/socket/cgroup activity to a specific daemon loop or retry path.

## Patch Plan
Do not edit files in the next pass from this evidence alone. The current bundle supports an observed performance/profile anomaly, not a pull-request-ready bug fix.

Start from the `dockerd` entrypoint evidence: `engine/cmd/dockerd/docker.go` -> `newDaemonCLI`/`runDaemon` in `engine/cmd/dockerd/daemon.go` -> containerd initialization/client creation in `engine/daemon/daemon.go` and `engine/libcontainerd/supervisor/remote_daemon.go`.

Follow Moby conventions found in `engine/CONTRIBUTING.md` and `engine/TESTING.md`: changes need focused unit tests, `gofmt -s`, and no new `integration-cli` tests. Local helpers/conventions found include `containerd/log` via `log.G(ctx)`, `github.com/pkg/errors` wrapping, `pidfile.Write`, `homedir.StickRuntimeDirContents`, `user.MkdirAllAndChown`, containerd `dialer.ContextDialer`, and existing gRPC/containerd timeout/backoff setup. No relevant wrapper was found that directly addresses the profiler’s kernel `mem_cgroup_handle_over_high` signal.

No prior Fixer patch is listed in the evidence (`prior_fixer_patch: null`), so there is nothing to replace.

Avoid proposing awkward retry-control changes such as adding `goto` or ad hoc sleeps. Any future patch in containerd connection/retry timing would be security-sensitive timing/throttling behavior and must first reproduce the behavior and analyze impact.

## Risks
The hottest symbol is in the kernel cgroup memory path, and the process was sleeping with very low CPU. A Moby source change could easily be speculative or mask an environmental cgroup/kernel pressure issue.

Unsymbolized Go backtraces prevent reliable source attribution. The evidence labels `socket-churn`, but the shown strace excerpt is dominated by futex waits plus a small number of `epoll_pwait`/`waitid` calls.

## Validation
Before any focused check, use the project entrypoint from the workspace root: `cd engine && make test-unit`.

For a bounded independent reproduction attempt, first build a daemon binary, then run a short traced startup/validation command against an isolated temp root and exec-root, capturing only futex/socket/epoll/wait syscalls with `timeout` and `strace`. Do not claim reproduced unless that command shows the same failure signal. If a future source patch is justified, run focused package tests such as `cd engine && TESTDIRS='./cmd/dockerd ./daemon ./libcontainerd/supervisor' make test-unit`, plus any new regression test package.

## Patch Pass

Subject: No patch: diagnose dockerd profiler signal

## Commit Message
No source change is proposed. The collected signal most likely points to memory-cgroup pressure around `dockerd`: the hot path is the kernel `mem_cgroup_handle_over_high` handler, while `/proc` and strace excerpts show a sleeping process with many futex waits rather than a symbolized Moby loop. Without a reproducer, symbolized Go frames, or accessible raw artifacts, a Docker source patch would be speculative.

## Evidence Confidence
inferred

## Issue Connection
Fixer collected profiler and trace evidence for `/usr/sbin/dockerd -H fd:// --containerd=/run/containerd/containerd.sock`: low CPU, sleeping state, many futex waits, and a kernel hot path in `mem_cgroup_handle_over_high`. That kernel routine is involved when a cgroup exceeds its configured memory high threshold, so the cautious inference is memory-cgroup pressure or kernel/runtime waiting, not a confirmed daemon retry loop.

I followed the saved plan in `plan-output.txt`: no source patch was left because the evidence is profiler/strace-only, unsymbolized, and the raw investigation directory is absent from this workspace. I inspected the daemon/containerd startup area and found existing local conventions and helpers: `log.G(ctx)`, `github.com/pkg/errors` wrapping, `pidfile.Write`, `homedir.StickRuntimeDirContents`, `user.MkdirAllAndChown`, containerd `dialer.ContextDialer`, and existing gRPC timeout/backoff setup. No relevant helper or Moby code path was identified that directly explains the kernel memory-cgroup hot path.

No prior Fixer patch was listed. I also did not change retry/backoff or other timing behavior, because that would be timing/throttling-sensitive and would need reproduced evidence plus security-impact analysis first.

The expected effect is no runtime change; this leaves a maintainer-ready diagnosis instead of an upstream patch that could mask an environmental cgroup/kernel issue.

## Git Add Paths
None

## Validation
`cd engine && make test-unit` failed before tests ran. Exact blocker: Docker build setup tried to create `/root/.docker` and failed with `ERROR: mkdir /root/.docker: read-only file system`; make exited at `Makefile:207: build`.

Independent reproduction attempt:
`cd engine && timeout 15s strace -f -e trace=futex,epoll_pwait,waitid,socket,connect ./bundles/binary-daemon/dockerd -H unix:///tmp/fixer-dockerd.sock --data-root /tmp/fixer-docker-root --exec-root /tmp/fixer-docker-exec --pidfile /tmp/fixer-dockerd.pid --containerd=/run/containerd/containerd.sock --debug`

That did not reproduce the signal. Exact blockers: `strace` reported `PTRACE_TRACEME: Operation not permitted`, and `./bundles/binary-daemon/dockerd` was absent because the build did not complete.

I also checked the raw artifact path from the evidence; `/var/lib/fixer/investigations/2026-05-06T10-55-05.762950439+00-00-dockerd-b732bcc6a3ff` is not present. `git diff --stat` and `git status --short` showed no source changes.

## Review Pass 1

RESULT: ok

No findings. The pass leaves no source diff, correctly treats the profiler/strace evidence as indirect, uses an allowed `## Evidence Confidence` value, reports the project-level validation attempt and blocker, and avoids inventing a confirmed Moby bug or unsafe timing/throttling patch.

## Plan Pass

## Problem
Fixer observed `dockerd` sleeping with many threads blocked in futex waits, low CPU (`0.1%`), a kernel hot path in `mem_cgroup_handle_over_high`, and an automated `socket-churn` classification. The available backtraces are unsymbolized, the raw investigation files are not present in this workspace, and no concrete Docker command, API request, or user-visible failure is provided.

## Evidence Confidence
observed

## Proposed Subject
No source patch yet: diagnose and report the indirect `dockerd` profiler signal until symbolized/source-level evidence identifies a Moby bug. A source patch would only be planned after collecting extra evidence that maps the observed futex/socket/cgroup activity to a specific daemon loop or retry path.

## Patch Plan
Do not edit files in the next pass from this evidence alone. The current bundle supports an observed performance/profile anomaly, not a pull-request-ready bug fix.

Start from the `dockerd` entrypoint evidence: `engine/cmd/dockerd/docker.go` -> `newDaemonCLI`/`runDaemon` in `engine/cmd/dockerd/daemon.go` -> containerd initialization/client creation in `engine/daemon/daemon.go` and `engine/libcontainerd/supervisor/remote_daemon.go`.

Follow Moby conventions found in `engine/CONTRIBUTING.md` and `engine/TESTING.md`: changes need focused unit tests, `gofmt -s`, and no new `integration-cli` tests. Local helpers/conventions found include `containerd/log` via `log.G(ctx)`, `github.com/pkg/errors` wrapping, `pidfile.Write`, `homedir.StickRuntimeDirContents`, `user.MkdirAllAndChown`, containerd `dialer.ContextDialer`, and existing gRPC/containerd timeout/backoff setup. No relevant wrapper was found that directly addresses the profiler’s kernel `mem_cgroup_handle_over_high` signal.

No prior Fixer patch is listed in the evidence (`prior_fixer_patch: null`), so there is nothing to replace.

Avoid proposing awkward retry-control changes such as adding `goto` or ad hoc sleeps. Any future patch in containerd connection/retry timing would be security-sensitive timing/throttling behavior and must first reproduce the behavior and analyze impact.

## Risks
The hottest symbol is in the kernel cgroup memory path, and the process was sleeping with very low CPU. A Moby source change could easily be speculative or mask an environmental cgroup/kernel pressure issue.

Unsymbolized Go backtraces prevent reliable sou

[truncated]

Issue page: /issues/019deedb-94d6-7423-a4c3-f13abd24a2cb. Issue JSON: /v1/issues/019deedb-94d6-7423-a4c3-f13abd24a2cb

python3.13 is stuck in a likely busy poll loop: 40.65% of sampled CPU passed through idle_cpu, with repeated thread backtraces show 1 thread(s) around 0x00007f1c6e7efe92 in pthread_attr_destroy () from target:<path>.

## 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): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `python3.13` 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.

Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `python3.13` 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 (local metadata check)

Local metadata consistency check

## Refinement Pass 1

You are refining a fixer patch after an explicit code review.

Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Read the latest author response at `./patch-output.txt`. Read the review report at `./review-1-output.txt`. This is refinement round 1. The original pre-edit snapshot is available at `./source` if you need to compare the current patch against it. Re-read the planning pass at `./plan-output.txt` before editing. The workspace currently changes these repo-relative paths: Lib/__pycache__/__future__.cpython-313.pyc, Lib/__pycache__/_collections_abc.cpython-313.pyc, Lib/__pycache__/_colorize.cpython-313.pyc, Lib/__pycache__/_compat_pickle.cpython-313.pyc, Lib/__pycache__/_compression.cpython-313.pyc, Lib/__pycache__/_opcode_metadata.cpython-313.pyc, Lib/__pycache__/_sitebuiltins.cpython-313.pyc, Lib/__pycache__/_weakrefset.cpython-313.pyc, Lib/__pycache__/abc.cpython-313.pyc, Lib/__pycache__/argparse.cpython-313.pyc, Lib/__pycache__/ast.cpython-313.pyc, Lib/__pycache__/bz2.cpython-313.pyc, Lib/__pycache__/codecs.cpython-313.pyc, Lib/__pycache__/contextlib.cpython-313.pyc, Lib/__pycache__/contextvars.cpython-313.pyc, Lib/__pycache__/copy.cpython-313.pyc, Lib/__pycache__/copyreg.cpython-313.pyc, Lib/__pycache__/datetime.cpython-313.pyc, Lib/__pycache__/dis.cpython-313.pyc, Lib/__pycache__/enum.cpython-313.pyc, Lib/__pycache__/fnmatch.cpython-313.pyc, Lib/__pycache__/functools.cpython-313.pyc, Lib/__pycache__/genericpath.cpython-313.pyc, Lib/__pycache__/gettext.cpython-313.pyc, Lib/__pycache__/glob.cpython-313.pyc, Lib/__pycache__/heapq.cpython-313.pyc, Lib/__pycache__/inspect.cpython-313.pyc, Lib/__pycache__/io.cpython-313.pyc, Lib/__pycache__/keyword.cpython-313.pyc, Lib/__pycache__/linecache.cpython-313.pyc, Lib/__pycache__/locale.cpython-313.pyc, Lib/__pycache__/lzma.cpython-313.pyc, Lib/__pycache__/numbers.cpython-313.pyc, Lib/__pycache__/opcode.cpython-313.pyc, Lib/__pycache__/operator.cpython-313.pyc, Lib/__pycache__/os.cpython-313.pyc, Lib/__pycache__/posixpath.cpython-313.pyc, Lib/__pycache__/reprlib.cpython-313.pyc, Lib/__pycache__/selectors.cpython-313.pyc, Lib/__pycache__/shutil.cpython-313.pyc, Lib/__pycache__/signal.cpython-313.pyc, Lib/__pycache__/site.cpython-313.pyc, Lib/__pycache__/socket.cpython-313.pyc, Lib/__pycache__/ssl.cpython-313.pyc, Lib/__pycache__/stat.cpython-313.pyc, Lib/__pycache__/string.cpython-313.pyc, Lib/__pycache__/struct.cpython-313.pyc, Lib/__pycache__/subprocess.cpython-313.pyc, Lib/__pycache__/textwrap.cpython-313.pyc, Lib/__pycache__/threading.cpython-313.pyc, Lib/__pycache__/token.cpython-313.pyc, Lib/__pycache__/tokenize.cpython-313.pyc, Lib/__pycache__/traceback.cpython-313.pyc, Lib/__pycache__/types.cpython-313.pyc, Lib/__pycache__/typing.cpython-313.pyc, Lib/__pycache__/warnings.cpython-313.pyc, Lib/__pycache__/weakref.cpython-313.pyc, Lib/asyncio/__pycache__/__init__.cpython-313.pyc, Lib/asyncio/__pycache__/base_events.cpython-313.pyc, Lib/asyncio/__pycache__/base_futures.cpython-313.pyc, Lib/asyncio/__pycache__/base_subprocess.cpython-313.pyc, Lib/asyncio/__pycache__/base_tasks.cpython-313.pyc, Lib/asyncio/__pycache__/constants.cpython-313.pyc, Lib/asyncio/__pycache__/coroutines.cpython-313.pyc, Lib/asyncio/__pycache__/events.cpython-313.pyc, Lib/asyncio/__pycache__/exceptions.cpython-313.pyc, Lib/asyncio/__pycache__/format_helpers.cpython-313.pyc, Lib/asyncio/__pycache__/futures.cpython-313.pyc, Lib/asyncio/__pycache__/locks.cpython-313.pyc, Lib/asyncio/__pycache__/log.cpython-313.pyc, Lib/asyncio/__pycache__/mixins.cpython-313.pyc, Lib/asyncio/__pycache__/protocols.cpython-313.pyc, Lib/asyncio/__pycache__/queues.cpython-313.pyc, Lib/asyncio/__pycache__/runners.cpython-313.pyc, Lib/asyncio/__pycache__/selector_events.cpython-313.pyc, Lib/asyncio/__pycache__/sslproto.cpython-313.pyc, Lib/asyncio/__pycache__/staggered.cpython-313.pyc, Lib/asyncio/__pycache__/streams.cpython-313.pyc, Lib/asyncio/__pycache__/subprocess.cpython-313.pyc, Lib/asyncio/__pycache__/taskgroups.cpython-313.pyc, Lib/asyncio/__pycache__/tasks.cpython-313.pyc, Lib/asyncio/__pycache__/threads.cpython-313.pyc, Lib/asyncio/__pycache__/timeouts.cpython-313.pyc, Lib/asyncio/__pycache__/transports.cpython-313.pyc, Lib/asyncio/__pycache__/trsock.cpython-313.pyc, Lib/asyncio/__pycache__/unix_events.cpython-313.pyc, Lib/collections/__pycache__/__init__.cpython-313.pyc, Lib/concurrent/__pycache__/__init__.cpython-313.pyc, Lib/concurrent/futures/__pycache__/__init__.cpython-313.pyc, Lib/concurrent/futures/__pycache__/_base.cpython-313.pyc, Lib/encodings/__pycache__/__init__.cpython-313.pyc, Lib/encodings/__pycache__/aliases.cpython-313.pyc, Lib/encodings/__pycache__/ascii.cpython-313.pyc, Lib/encodings/__pycache__/utf_8.cpython-313.pyc, Lib/importlib/__pycache__/__init__.cpython-313.pyc, Lib/importlib/__pycache__/_abc.cpython-313.pyc, Lib/logging/__pycache__/__init__.cpython-313.pyc, Lib/pathlib/__pycache__/__init__.cpython-313.pyc, Lib/pathlib/__pycache__/_abc.cpython-313.pyc, Lib/pathlib/__pycache__/_local.cpython-313.pyc, Lib/re/__pycache__/__init__.cpython-313.pyc, Lib/re/__pycache__/_casefix.cpython-313.pyc, Lib/re/__pycache__/_compiler.cpython-313.pyc, Lib/re/__pycache__/_constants.cpyth

[truncated 29270 bytes]

## Plan Pass

## Problem
Fixer attributed high CPU to `python3.13`, but the command line is `/usr/bin/python3 /usr/bin/supervisord -n -c /etc/supervisor/supervisord.conf`. The embedded strace shows a one-second `poll()` timeout followed by `wait4(..., WNOHANG)` returning `ECHILD`, while `/proc` state is sleeping in `poll_schedule_timeout`. That does not identify a CPython runtime defect.

## Evidence Confidence
inferred

## Proposed Subject
No CPython source patch yet: diagnose likely application-level `supervisord` polling attribution rather than changing Python 3.13 runtime behavior.

## Patch Plan
Do not edit CPython in this pass. The evidence is indirect/profiler-only and points first to the script/application entrypoint, per the instructions.

Before any future source patch, collect stronger evidence showing a CPython frame or API contract bug: a live `supervisord` reproduction with symbols, `strace`/`perf` showing true short-timeout spinning, and a Python-level stack implicating `select`, `subprocess`, `asyncio`, or another stdlib caller.

Inspected conventions: `README.rst` points contributors to the CPython Developer Guide and documents `./configure`, `make`, and `make test`. Relevant local helpers/conventions found include `_PyTime_FromMillisecondsObject`, `_PyDeadline_Init/Get`, `Py_BEGIN_ALLOW_THREADS`, `posix_error()`, and `wait_helper()` in the `poll()`/`waitpid()` paths. No relevant project helper was found that would justify changing the observed app loop.

No prior Fixer patch was present to improve or replace. No source control-flow change is planned, so there is no reason to introduce awkward `goto`-style handling.

## Risks
Patching CPython based on this evidence could change stable POSIX `poll()`/`waitpid()` semantics and regress normal event loops. The top CPU symbol is kernel `idle_cpu`, the sampled process is sleeping, and accessible matching investigation directories were not the exact embedded artifact, so attribution remains weak.

## Validation
For any later CPython patch, first try the project-level entrypoint from the workspace root: `./configure && make`. If that fails due to missing dependencies or generated files, record the exact failure and then run the narrowest relevant compile/test.

For this no-patch diagnosis, the bounded independent check should be live-observation only if the target exists: `pgrep -af 'supervisord -n -c /etc/supervisor/supervisord.conf'`, then `timeout 5s strace -tt -e poll,wait4 -p <pid>`. Do not claim reproduced unless that shows a real tight loop rather than one-second blocking polls.

## Patch Pass

Subject: Report insufficient CPython evidence for supervisord poll loop

## Commit Message
No source change was made. The collected perf, strace, and `/proc` evidence points to a `supervisord` event loop running under Python, not to a demonstrated CPython runtime bug.

## Evidence Confidence
inferred

## Issue Connection
The collected signal is a `python3.13` process reported as high CPU while running `/usr/bin/python3 /usr/bin/supervisord -n -c /etc/supervisor/supervisord.conf`. The strace excerpt shows `poll(..., 1000)` blocking for about one second between `wait4(..., WNOHANG)` calls returning `ECHILD`, and `/proc` reports the process sleeping in `poll_schedule_timeout`.

The cautious code-level inference is that this is application-level polling by `supervisord`, not a CPython `poll()` or `waitpid()` defect. The CPython paths inspected already use the local conventions/helpers for this subsystem: `_PyTime_FromMillisecondsObject`, `_PyDeadline_Init/Get`, `Py_BEGIN_ALLOW_THREADS`, `posix_error()`, and `wait_helper()`. `README.rst` points contributors to the CPython Developer Guide; no relevant `CONTRIBUTING`, `HACKING`, or `README-hacking` file was found.

The specific change made is no source diff. This follows the saved plan rather than drifting from it: inferred profiler/strace evidence is not pull-request-ready for a CPython behavior change. The expected effect is no runtime behavior change and no speculative alteration to stable POSIX `poll()`/`waitpid()` semantics; this diagnosis is suitable input for an upstream or downstream report requesting stronger application-level evidence.

## Git Add Paths
None

## Validation
Ran `./configure && make` from the workspace root. It exited with status 0. During the build, `make` reported optional module issues: `_dbm`, `_gdbm`, and `_tkinter` were missing, and `_ssl` was built then removed because importing it failed with `undefined symbol: TLSv1_method`; it also printed `Could not build the ssl module! Python requires a OpenSSL 1.1.1 or newer`.

Attempted the bounded independent reproduction from the plan with `pgrep -af '[s]upervisord -n -c /etc/supervisor/supervisord.conf'`. It produced no output, so no matching live process was available for a safe `strace -p` comparison. The raw artifact directory named in `evidence.json` also was not present: `ls -la /var/lib/fixer/investigations/2026-05-06T18-50-47.378825658+00-00-python3-13-41ddba5b6e4b` returned `No such file or directory`.

## Review Pass 1 (local metadata check)

RESULT: fix-needed

## Findings
1. 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Update `## Git Add Paths` to match the real shipped file set exactly, and make sure `## Issue Connection` explains every functional file that remains in the patch.
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`build/lib.linux-x86_64-3.13/_uuid.cpython-313-x86_64-linux-gnu.so`, `build/lib.linux-x86_64-3.13/_xxtestfuzz.cpython-313-x86_64-linux-gnu.so`, `build/lib.linux-x86_64-3.13/_zoneinfo.cpython-313-x86_64-linux-gnu.so`, `build/lib.linux-x86_64-3.13/array.cpython-313-x86_64-linux-gnu.so`, `build/lib.linux-x86_64-3.13/binascii.cpython-313-x86_64-linux-gnu.so`, `build/lib.linux-x86_64-3.13/cmath.cpython-313-x86_64-linux-gnu.so`, `build/lib.linux-x86_64-3.13/fcntl.cpython-313-x86_64-linux-gnu.so`, `build/lib.linux-x86_64-3.13/grp.cpython-313-x86_64-linux-gnu.so`, `build/lib.linux-x86_64-3.13/math.cpython-313-x86_64-linux-gnu.so`, `build/lib.linux-x86_64-3.13/mmap.cpython-313-x86_64-linux-gnu.so`, `build/lib.linux-x86_64-3.13/pyexpat.cpython-313-x86_64-linux-gnu.so`, `build/lib.linux-x86_64-3.13/readline.cpython-313-x86_64-linux-gnu.so`, `build/lib.linux-x86_64-3.13/resource.cpython-313-x86_64-linux-gnu.so`, `build/lib.linux-x86_64-3.13/select.cpython-313-x86_64-linux-gnu.so`, `build/lib.linux-x86_64-3.13/syslog.cpython-313-x86_64-linux-gnu.so`, `build/lib.linux-x86_64-3.13/termios.cpython-313-x86_64-linux-gnu.so`, `build/lib.linux-x86_64-3.13/unicodedata.cpython-313-x86_64-linux-gnu.so`, `build/lib.linux-x86_64-3.13/xxlimited.cpython-313-x86_64-linux-gnu.so`, `build/lib.linux-x86_64-3.13/xxlimited_35.cpython-313-x86_64-linux-gnu.so`, `build/lib.linux-x86_64-3.13/xxsubtype.cpython-313-x86_64-linux-gnu.so`, `build/lib.linux-x86_64-3.13/zlib.cpython-313-x86_64-linux-gnu.so`, `build/scripts-3.13/idle3.13`, `build/scripts-3.13/pydoc3.13`, `config.log`, `config.status`, `libpython3.13.a`, `platform`, `pybuilddir.txt`, `pyconfig.h`, `python`, `python-config`, `python-config.py`, `python-gdb.py`.
2. Listed in `## Git Add Paths` but not actually changed: `None`.

## Refinement Pass 1

Subject: Keep python3.13 poll-loop report as no-patch diagnosis

## Commit Message
No source change was made. This refinement removes the generated build artifacts left by validation so the no-patch diagnosis is consistent with `Git Add Paths: None`.

## Evidence Confidence
inferred

## Issue Connection
The collected signal is a `python3.13` process reported as high CPU while running `/usr/bin/python3 /usr/bin/supervisord -n -c /etc/supervisor/supervisord.conf`. The strace excerpt shows `poll(..., 1000)` blocking for about one second between `wait4(..., WNOHANG)` calls returning `ECHILD`, and `/proc` reports the process sleeping in `poll_schedule_timeout`.

The cautious inference remains that this is application-level polling by `supervisord`, not a demonstrated CPython `poll()` or `waitpid()` runtime defect. The inspected CPython paths already use the local helper conventions for this area: `_PyTime_FromMillisecondsObject`, `_PyDeadline_Init/Get`, `Py_BEGIN_ALLOW_THREADS`, `posix_error()`, and `wait_helper()`. `README.rst` points contributors to the CPython Developer Guide; no relevant `CONTRIBUTING`, `HACKING`, or `README-hacking` file was found.

The specific refinement was to clean the generated validation artifacts that the review flagged, not to change source. The expected effect is a clean, gittable no-patch diagnosis with no speculative change to stable POSIX `poll()` or `waitpid()` behavior.

## Git Add Paths
None

## Validation
Addressed the review finding by running `make distclean`; this removed generated build outputs and `__pycache__` artifacts. `git status --short` is now empty, so `Git Add Paths: None` matches the workspace.

Earlier project-level validation in this proposal ran `./configure && make` from the workspace root and exited with status 0, while reporting optional module issues: `_dbm`, `_gdbm`, and `_tkinter` missing, and `_ssl` removed after import failed with `undefined symbol: TLSv1_method`.

After cleanup, `make check` failed with `make: *** No rule to make target 'check'.  Stop.` because `make distclean` removed the generated `Makefile`.

Bounded independent reproduction remains blocked: `pgrep -af '[s]upervisord -n -c /etc/supervisor/supervisord.conf'` produced no output, so no live matching process was available for `strace`. The raw artifact directory named in `evidence.json` is also absent: `No such file or directory`.

## Review Pass 2

RESULT: ok

The refined proposal is now internally consistent: the workspace is clean (`git status --short` and `git diff --stat` are empty), `## Git Add Paths` is `None`, and no generated build artifacts remain.

The no-patch diagnosis is appropriate for the evidence level. The evidence is indirect profiler/strace data from a `supervisord` process running under Python, with one-second `poll()` timeouts and no reproduced CPython runtime defect. The author keeps `## Evidence Confidence` as `inferred`, avoids claiming a confirmed Python bug, and does not leave a source diff.

Validation is acceptable for a no-patch refinement: the prior project-level `./configure && make` result is reported, the cleanup step is reported, `make check` failure is explained by the missing generated `Makefile` after `distclean`, and the bounded reproduction attempt is documented as blocked because no matching live `supervisord` process or raw artifact directory was available.

## Plan Pass

## Problem
Fixer attributed high CPU to `python3.13`, but the command line is `/usr/bin/python3 /usr/bin/supervisord -n -c /etc/supervisor/supervisord.conf`. The embedded strace shows a one-second `poll()` timeout followed by `wait4(..., WNOHANG)` returning `ECHILD`, while `/proc` state is sleeping in `poll_schedule_timeout`. That does not identify a CPython runtime defect.

## Evidence Confidence
inferred

## Proposed Subject
No CPython source patch yet: diagnose likely application-level `supervisord` polling attribution rather than changing Python 3.13 runtime behavior.

## Patch Plan
Do not edit CPython in this pass. The evidence is indirect/profiler-only and points first to the script/application entrypoint, per the instructions.

Before any future source patch, collect stronger evidence showing a CPython frame or API contract bug: a live `supervisord` reproduction with symbols, `strace`/`perf` showing true short-timeout spinning, and a Python-level stack implicating `select`, `subprocess`, `asyncio`, or another stdlib caller.

Inspected conventions: `README.rst` points contributors to the CPython Developer Guide and documents `./configure`, `make`, and `make test`. Relevant local helpers/conventions found include `_PyTime_FromMillisecondsObject`, `_PyDeadline_Init/Get`, `Py_BEGIN_ALLOW_THREADS`, `posix_error()`, and `wait_helper()` in the `poll()`/`waitpid()` paths. No relevant project helper was found that would justify changing the observed app loop.

No prior Fixer patch was present to improve or replace. No source control-flow change is planned, so there is no reason to introduce awkward `goto`-style handling.

## Risks
Patching CPython based on this evidence could change stable POSIX `poll()`/`waitpid()` semantics and regress normal event loops. The top CPU symbol is kernel `idle_cpu`, the sampled process is sleeping, and accessible matching investigation directories were not the exact embedded artifact, so attribution remains weak.

## Validation
For any later CPython patch, first try the project-level entrypoint from the workspace root: `./configure && make`. If that fails due to missing dependencies or generated files, record the exact failure and then run the narrowest relevant compile/test.

For this no-patch diagnosis, the bounded independent check should be live-observation only if the target exists: `pgrep -af 'supervisord -n 

[truncated]

Issue page: /issues/019dfead-0293-7062-b24e-c9b04c2f1edb. Issue JSON: /v1/issues/019dfead-0293-7062-b24e-c9b04c2f1edb

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>.

## 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.

## 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

[truncated]

Issue page: /issues/019e4743-6f51-7fc1-b372-9900d37706a1. Issue JSON: /v1/issues/019e4743-6f51-7fc1-b372-9900d37706a1

python3.13 is stuck in a likely busy poll loop: 50.00% of sampled CPU passed through read_tsc, with repeated thread backtraces show 1 thread(s) around 0x00007f1c6e7efe92 in pthread_attr_destroy () from target:<path>.

## 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): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `python3.13` 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.

Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `python3.13` 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 `python3.13` 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): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, 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 attributed a high-CPU/busy-poll signal to `python3.13`, but the evidence shows an application process: `/usr/bin/python3 /usr/bin/supervisord -n -c /etc/supervisor/supervisord.conf`. The excerpted strace is a 1-second supervisor loop: `wait4(-1, ..., WNOHANG) = -1 ECHILD`, then `poll(..., 1000) = 0`. The sampled process is also `S (sleeping)` in `poll_schedule_timeout`, which does not identify a CPython runtime defect.

## Evidence Confidence
inferred

## Proposed Subject
No CPython source patch. Prepare a no-patch diagnosis that the collected signal is not pull-request-ready for `python3.13`; it appears to be an application-level supervisor event loop or profiler misattribution, not a demonstrated interpreter bug.

## Patch Plan
Do not edit files in this pass. If later evidence proves a CPython defect, investigate the exact runtime path first, following CPython conventions from `README.rst` and the Developer Guide.

Relevant local conventions/helpers found:
`Modules/selectmodule.c` uses `_PyDeadline_Init`, `_PyDeadline_Get`, `_PyTime_AsMilliseconds`, `Py_BEGIN_ALLOW_THREADS`, and EINTR signal checks around `poll()`.
`Modules/posixmodule.c` uses Argument Clinic wrappers, `posix_error()`, `wait_helper()`, `Py_BEGIN_ALLOW_THREADS`, and `PyErr_CheckSignals()` around `wait4()`/`waitpid()`.
`Lib/subprocess.py` already handles `ECHILD` in process polling paths.

No prior Fixer patch for this issue was found in the workspace or Debian patch stack. Since this is a no-patch plan, there is no control-flow change to make; if a future patch is justified, avoid awkward `goto` where a bounded helper or existing EINTR loop pattern fits.

## Risks
A source patch based only on this evidence would likely change CPython behavior without a demonstrated failing CPython invariant. The `poll(..., 1000)` timeout and `wait4(..., WNOHANG)` pattern can be normal application scheduling behavior. The backtrace excerpt is weak: symbols are mostly unresolved and do not point to a specific CPython source bug.

## Validation
First try the project-level entrypoint from the workspace root: `./configure && make`. If it fails due to missing dependencies or generated files, record the exact command and failure reason.

For a bounded independent check of the collected signal, run a tiny straced Python loop after build, preferably with `./python`, that performs `os.waitpid(-1, os.WNOHANG)` with no children and `select.poll().poll(1000)` on an idle pipe. This can show the syscall pattern is easy to produce without proving an interpreter failure. If no source patch is made, no focused compile is needed beyond documenting the diagnosis and build availability.

## Patch Pass

Subject: Diagnose inferred python3.13 poll signal without source changes

## Commit Message
No source change is proposed. The collected perf, strace, and `/proc` evidence points to a Python-hosted `supervisord` process waking once per second, calling `wait4(..., WNOHANG)` with no children, and then sleeping in `poll(..., 1000)`. That is not enough evidence for an upstream CPython runtime patch.

## Evidence Confidence
inferred

## Issue Connection
The collected signal is a `python3.13` process reported as high CPU, with perf samples in `read_tsc`, strace showing repeated `wait4(-1, ..., WNOHANG) = -1 ECHILD` followed by `poll(..., 1000) = 0`, and `/proc` showing the process sleeping in `poll_schedule_timeout`.

The cautious code-level inference is that the interpreter binary is hosting an application event loop from `/usr/bin/supervisord`, not that CPython’s `poll()` or `wait4()` wrappers are spinning incorrectly. Nearby CPython code already uses the expected local patterns: `_PyDeadline_Init()` / `_PyDeadline_Get()` around `poll()`, `Py_BEGIN_ALLOW_THREADS` around blocking syscalls, EINTR retry handling with `PyErr_CheckSignals()`, Argument Clinic wrappers, and existing `subprocess` handling for `ECHILD`.

The specific change made is no source change. I followed the saved plan and did not change course.

The expected effect is to avoid landing a speculative CPython patch from indirect profiler evidence. A stronger upstream report would need an application-independent reproducer or a trace showing a CPython invariant being violated.

## Git Add Paths
None

## Validation
Ran `./configure && make` from the workspace root. It completed with exit code 0. The build reported optional missing modules `_dbm`, `_gdbm`, and `_tkinter`; it also built `_ssl` but removed it because import failed with `undefined symbol: TLSv1_method`.

Attempted bounded syscall reproduction:

`timeout 5 strace -f -e trace=poll,wait4 ./python - <<'PY' ...`

This was blocked by the environment: `PTRACE_TRACEME: Operation not permitted` and `ptrace(PTRACE_SEIZE, 6): Operation not permitted`. Because the independent trace could not run, I did not classify the issue as reproduced.

Checked contribution/style context in `README.rst`, which points to the CPython Developer Guide and documents `./configure`, `make`, and `make test`. Inspected `Modules/selectmodule.c`, `Modules/posixmodule.c`, and `Lib/subprocess.py` for local wait/poll helpers and conventions. Final `git status --short` is clean.

## Review Pass 1

RESULT: ok

No blocking findings.

The worktree is clean, `## Git Add Paths` is `None`, and the author correctly treats the evidence as `inferred` rather than landing a speculative CPython source patch. The diagnosis matches the evidence bundle: a Python-hosted `supervisord` process is sleeping in `poll_schedule_timeout` while periodically calling `wait4(..., WNOHANG)` and `poll(..., 1000)`.

The response includes the required evidence confidence section, avoids claiming local reproduction after `strace` was blocked by ptrace permissions, reports the project-level `./configure && make` validation result, and names relevant CPython conventions/helpers in the inspected wait/poll paths.

## Plan Pass

## Problem
Fixer attributed a high-CPU/busy-poll signal to `python3.13`, but the evidence shows an application process: `/usr/bin/python3 /usr/bin/supervisord -n -c /etc/supervisor/supervisord.conf`. The excerpted strace is a 1-second supervisor loop: `wait4(-1, ..., WNOHANG) = -1 ECHILD`, then `poll(..., 1000) = 0`. The sampled process is also `S (sleeping)` in `poll_schedule_timeout`, which does not identify a CPython runtime defect.

## Evidence Confidence
inferred

## Proposed Subject
No CPython source patch. Prepare a no-patch diagnosis that the collected signal is not pull-request-ready for `python3.13`; it appears to be an application-level supervisor event loop or profiler misattribution, not a demonstrated interpreter bug.

## Patch Plan
Do not edit files in this pass. If later evidence proves a CPython defect, investigate the exact runtime path first, following CPython conventions from `README.rst` and the Developer Guide.

Relevant local conventions/helpers found:
`Modules/selectmodule.c` uses `_PyDeadline_Init`, `_PyDeadline_Get`, `_PyTime_AsMilliseconds`, `Py_BEGIN_ALLOW_THREADS`, and EINTR signal checks around `poll()`.
`Modules/posixmodule.c` uses Argument Clinic wrappers, `posix_error()`, `wait_helper()`, `Py_BEGIN_ALLOW_THREADS`, and `PyErr_CheckSignals()` around `wait4()`/`waitpid()`.
`Lib/subprocess.py` already handles `ECHILD` in process polling paths.

No prior Fixer patch for this issue was found in the workspace or Debian patch stack. Since this is a no-patch plan, there is no control-flow change to make; if a future patch is justified, avoid awkward `goto` where a bounded helper or existing EINTR loop pattern fits.

## Risks
A source patch based only on this evidence would likely change CPython behavior without a demonstrated failing CPython invariant. The `poll(..., 1000)` timeout and `wait4(..., WNOHANG)` pattern can be normal application scheduling behavior. The backtrace excerpt is weak: symbols are mostly unresolved and do not point to a specific CPython source bug.

## Validation
First try the project-level entrypoint from the workspace root: `./configure && make`. If it fails due to missing dependencies or generated files, record the exact command and failure reason.

For a bounded independent check of the collected signal, run a tiny straced Python loop after build, preferably with `./python`, that performs `os.w

[truncated]

Issue page: /issues/019da8df-cd0c-7880-ab1e-6dd908d64437. Issue JSON: /v1/issues/019da8df-cd0c-7880-ab1e-6dd908d64437

postgres is stuck in a likely busy poll loop: 8.22% of sampled CPU passed through handle_mm_fault, with repeated thread backtraces show 1 thread(s) around 0x00007f322d29a7d2 in ?? () from target:<path>.

## 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): `./configure && make`, `meson setup build-fix && meson compile -C build-fix && meson test -C build-fix`, `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `postgresql-18` 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.

Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `./configure && make`, `meson setup build-fix && meson compile -C build-fix && meson test -C build-fix`, `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `postgresql-18` 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 `postgresql-18` 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): `./configure && make`, `meson setup build-fix && meson compile -C build-fix && meson test -C build-fix`, `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, 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
The evidence does not support a PostgreSQL source bug. The sampled `postgres` postmaster is sleeping in `epoll_wait` via `WaitEventSetWait()`/`ServerLoop()`, with process state `S`, `wchan=do_epoll_wait`, only one `epoll_wait` line over 5 seconds, and total CPU around 0.3%. That is normal idle postmaster behavior, not a demonstrated busy poll loop.

## Evidence Confidence
inferred

## Proposed Subject
No source patch: report the finding as an unsupported busy-poll classification for an idle PostgreSQL postmaster.

## Patch Plan
Do not edit source in this pass. A source patch would be speculative because the evidence is profiler-only and contradicts the “runaway CPU” label.

If later evidence shows a real tight wait loop, investigate `src/backend/postmaster/postmaster.c` first, especially `DetermineSleepTime()` and `ServerLoop()`, then `src/backend/storage/ipc/waiteventset.c`. Follow PostgreSQL conventions found in `src/tools/pgindent/README`; use existing local primitives such as `WaitEventSetWait()`, `SetLatch()`/`ResetLatch()`, `pgstat_report_wait_start/end`, and `ereport()`. Avoid awkward control flow such as avoidable `goto`; the existing wait-loop structure is already bounded and clear.

No prior Fixer patch was found to improve or replace; the workspace is clean.

## Risks
Changing wait timing without reproduced evidence could regress postmaster responsiveness, signal/latch handling, connection acceptance, or background-worker restart timing. The implicated code is core cross-platform event-loop infrastructure, so any speculative mitigation would have high blast radius.

## Validation
Before any future source patch, try the project-level entrypoint from the workspace root:

`./configure && make`

If available and the build completes, run:

`make check`

For an independent bounded reproduction attempt, build an unmodified tree, initialize a temporary cluster under `/tmp`, start an idle postmaster, and collect `ps`, `/proc/<pid>/wchan`, and a short `timeout 5 strace -tt -p <pid>`. The expected result for the collected signal is a sleeping postmaster blocked in `epoll_wait` with negligible CPU, not a reproducible failure.

## Patch Pass

Subject: Diagnose idle postmaster wait as non-actionable profiler signal

## Commit Message
No source change. The collected evidence points to an idle PostgreSQL postmaster, the parent server process, sleeping in the normal `WaitEventSetWait()` event wait path rather than spinning in a busy loop.

## Evidence Confidence
inferred

## Issue Connection
Fixer collected a perf/profile signal labeled as a likely busy poll loop, but the raw evidence shows the sampled `postgres` process in state `S (sleeping)`, `wchan=do_epoll_wait`, one `epoll_wait` syscall observed over 5 seconds, and only about 0.3% total CPU across PostgreSQL processes.

The code path matches normal postmaster idle behavior: `ServerLoop()` calls `WaitEventSetWait()` with a timeout from `DetermineSleepTime()`, and `WaitEventSetWait()` is PostgreSQL’s local abstraction for waiting on latches, which are wakeup flags, and socket readiness. The local code already uses PostgreSQL helpers and conventions such as `WaitEventSetWait()`, `SetLatch()`/`ResetLatch()`, `pgstat_report_wait_start/end`, and `ereport()`. The relevant style convention found was `src/tools/pgindent/README`.

I followed the saved plan and did not leave a source diff. The evidence is indirect/profiler-based and contradicts the proposed runaway-process diagnosis, so a timing or wait-loop patch would not be pull-request-ready. Because no source patch was left, there is no runtime effect; the expected effect of this report is to avoid an unsafe speculative change to core postmaster wait behavior.

## Git Add Paths
None

## Validation
Ran `./configure && make` from the workspace root: passed.

Ran `make check` from the workspace root: failed before tests while creating PostgreSQL’s temporary install. Exact blocker from `tmp_install/log/initdb-template.log`:

```text
initdb: error: cannot be run as root
initdb: hint: Please log in (using, e.g., "su") as the (unprivileged) user that will own the server process.
```

Independent reproduction attempt: tried to reproduce the collected idle-postmaster signal by starting a temporary local cluster for `ps`/`strace` inspection, but the environment runs as uid `0`, and PostgreSQL refuses `initdb`/server setup as root. `ps -C postgres -o pid,ppid,state,pcpu,wchan,cmd` also found no live `postgres` process to attach to. Confidence remains `inferred`.

## Review Pass 1

RESULT: ok

No blocking findings. The workspace has no source diff, `## Evidence Confidence` is valid and appropriately set to `inferred`, and the no-patch diagnosis is consistent with the profiler/strace evidence showing a sleeping postmaster in `epoll_wait` rather than a reproduced busy loop.

The author also attempted the project-level build path, reported the `make check` blocker clearly, and avoided leaving a speculative source patch in core wait/timing code.

## Plan Pass

## Problem
The evidence does not support a PostgreSQL source bug. The sampled `postgres` postmaster is sleeping in `epoll_wait` via `WaitEventSetWait()`/`ServerLoop()`, with process state `S`, `wchan=do_epoll_wait`, only one `epoll_wait` line over 5 seconds, and total CPU around 0.3%. That is normal idle postmaster behavior, not a demonstrated busy poll loop.

## Evidence Confidence
inferred

## Proposed Subject
No source patch: report the finding as an unsupported busy-poll classification for an idle PostgreSQL postmaster.

## Patch Plan
Do not edit source in this pass. A source patch would be speculative because the evidence is profiler-only and contradicts the “runaway CPU” label.

If later evidence shows a real tight wait loop, investigate `src/backend/postmaster/postmaster.c` first, especially `DetermineSleepTime()` and `ServerLoop()`, then `src/backend/storage/ipc/waiteventset.c`. Follow PostgreSQL conventions found in `src/tools/pgindent/README`; use existing local primitives such as `WaitEventSetWait()`, `SetLatch()`/`ResetLatch()`, `pgstat_report_wait_start/end`, and `ereport()`. Avoid awkward control flow such as avoidable `goto`; the existing wait-loop structure is already bounded and clear.

No prior Fixer patch was found to improve or replace; the workspace is clean.

## Risks
Changing wait timing without reproduced evidence could regress postmaster responsiveness, signal/latch handling, connection acceptance, or background-worker restart timing. The implicated code is core cross-platform event-loop infrastructure, so any speculative mitigation would have high blast radius.

## Validation
Before any future source patch, try the project-level entrypoint from the workspace root:

`./configure && make`

If available and the build completes, run:

`make check`

For an independent bounded reproduction attempt, build an unmodified tree, initialize a temporary cluster under `/tmp`, start an idle postmaster, and collect `ps`, `/proc/<pid>/wchan`, and a short `timeout 5 strace -tt -p <pid>`. The expected result for the collected signal is a sleeping postmaster blocked in `epoll_wait` with negligible CPU, not a reproducible failure.

## Patch Pass

Subject: Diagnose idle postmaster wait as non-actionable profiler signal

## Commit Message
No source change. The collected evidence points to an idle PostgreSQL postmaster, the parent server 

[truncated]

Issue page: /issues/019e6478-428d-7733-99f4-35432ecbbb68. Issue JSON: /v1/issues/019e6478-428d-7733-99f4-35432ecbbb68

postgres shows a repeated `D`-state wait, likely blocked in unknown uninterruptible wait via an unknown wait point.

## 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-vcs-git`. The original pre-edit snapshot is available at `./source` if you need to inspect it.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `postgresql-17` 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-vcs-git`. 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.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `postgresql-17` 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-vcs-git`. 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 `postgresql-17` upstream patch, not just a Debian-local workaround. 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 one `postgres` process from `postgresql-17` as stuck in uninterruptible sleep for ~1,493,330s, but the bundle has no stack, fd, sched, IO, or status excerpt. It also records `process_state: "R (running)"` and `wchan: "0"`, so the collected signal does not identify a PostgreSQL subsystem or a kernel/filesystem wait path. The workspace is Debian packaging-only and currently says `MAJOR_VER := 18`, while the evidence is for installed `17.9-0+deb13u1`.

## Evidence Confidence
inferred

## Proposed Subject
No source patch: collect richer stuck-backend diagnostics before changing PostgreSQL

## Patch Plan
No source patch in this pass. The evidence is insufficient to connect the reported D-state to PostgreSQL source behavior, and a speculative upstream patch would not be pull-request-ready.

I found no `CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, or `dev-docs/` in the prepared checkout or original snapshot. The checkout uses Debian packaging conventions: `debian/rules` includes `/usr/share/postgresql-common/server/postgresql.mk`, and source deltas are quilt patches listed in `debian/patches/series`. No prior Fixer patch was found. Existing local PostgreSQL helper usage in patches includes `pgstat_get_entry_ref_locked()` / `pgstat_unlock_entry()`, but the evidence does not implicate pgstat or locking.

The report should request/collect `/proc/$pid/stack`, `/proc/$pid/wchan`, `/proc/$pid/status`, `/proc/$pid/sched`, `/proc/$pid/io`, fd targets, `ps` STAT/WCHAN samples, relevant kernel logs, and PostgreSQL-side context such as `pg_stat_activity` and wait events if the postmaster is responsive.

## Risks
A source patch would be high-risk because the wait site is unknown and could be kernel, storage, filesystem, VM, or external IO related. The source tree mismatch, `postgresql-17` evidence vs PostgreSQL 18 packaging checkout, also blocks a clean upstream-style fix. No authentication, authorization, cryptography, sandboxing, permissions, or timing/throttling behavior should be touched.

## Validation
If later evidence justifies a patch, first try the reproducible package build entrypoint from the workspace root: `dpkg-buildpackage -us -uc -b`, with `debian/rules build` as the direct packaging build path. Then run the package test entrypoint `debian/tests/run-testsuite` where the required PostgreSQL common test environment is available.

For bounded independent reproduction of the collected signal, sample local PostgreSQL processes twice over a short interval with `ps -eo pid,stat,wchan:32,comm,args` and confirm whether any `postgres` PID remains in `D` with a stable nonzero wait channel. Do not claim reproduction unless that command actually shows the stuck state.

## Patch Pass

Subject: Diagnose unknown PostgreSQL D-state report without source patch

## Commit Message
No source change is included. The collected evidence reports a long-running PostgreSQL backend in uninterruptible sleep, but it does not contain the kernel stack, file descriptors, scheduler data, IO counters, perf output, or strace output needed to identify a PostgreSQL code path. A speculative patch would not be upstreamable.

## Evidence Confidence
inferred

## Issue Connection
The collected signal is one `postgres` process from `postgresql-17` reported as stuck in `D` state for about 1,493,330 seconds. `D` state means uninterruptible sleep in the kernel, commonly while waiting on storage, filesystem, or another kernel resource. The bundle does not include perf or strace evidence, and its `/proc` summary is incomplete: it reports `wchan: "0"` and also `process_state: "R (running)"`, with no stack, fd, sched, status, or IO excerpt.

The cautious inference is that this is an unknown kernel wait, not a demonstrated PostgreSQL user-space loop or a specific PostgreSQL locking bug. I followed the saved plan and did not change course: no source patch was made. The expected effect is to avoid landing an unreviewable upstream patch and instead make the next diagnostic step clear: collect `/proc/$pid/stack`, `/proc/$pid/wchan`, `/proc/$pid/status`, `/proc/$pid/sched`, `/proc/$pid/io`, fd targets, repeated `ps` STAT/WCHAN samples, kernel logs, and PostgreSQL wait-event context if the server is responsive.

I found no `CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, or `dev-docs/` in the prepared checkout or original snapshot. The checkout is Debian packaging-only, uses `/usr/share/postgresql-common/server/postgresql.mk`, and carries quilt patches in `debian/patches/series`. No prior Fixer patch was found. No relevant local helper was found for this evidence; existing pgstat helpers such as `pgstat_get_entry_ref_locked()` / `pgstat_unlock_entry()` are present in a Debian patch, but the evidence does not implicate pgstat.

## Git Add Paths
None

## Validation
`dpkg-buildpackage -us -uc -b` from the workspace root failed before build because dependencies are missing: `libnuma-dev libpam0g-dev | libpam-dev libperl-dev liburing-dev llvm-dev lz4 | liblz4-tool systemtap-sdt-dev tcl-dev tzdata-legacy | tzdata (<< 2023c-8)`.

`debian/rules build` was attempted as a narrower workspace-root build entrypoint. It failed at `make -C build/src all` with `make: *** build/src: No such file or directory. Stop.`, consistent with this packaging snapshot not providing a configured upstream build tree here.

Independent reproduction attempt: I sampled local processes twice with `ps -eo pid,stat,wchan:32,comm,args` separated by 5 seconds and filtered for `postgres`. No local `postgres` process appeared in either sample, so the D-state signal was not reproduced.

`git status --short` is clean; no source diff was left.

## Review Pass 1

RESULT: ok

No source diff is present, and the author correctly returned a no-patch diagnosis for `inferred` evidence. The evidence bundle lacks perf, strace, stack, fd, sched, IO, and status details, and contains inconsistent process-state data, so a PostgreSQL source patch would not be PR-ready.

The response includes the required `## Evidence Confidence` section with a valid value, avoids claiming reproduction, documents the failed project-level build entrypoints and blockers, and reports a bounded independent process-state probe. It also names the missing contribution docs, Debian packaging convention, absence of a prior Fixer patch, and lack of a relevant local helper for this evidence.

## Plan Pass

## Problem
Fixer reported one `postgres` process from `postgresql-17` as stuck in uninterruptible sleep for ~1,493,330s, but the bundle has no stack, fd, sched, IO, or status excerpt. It also records `process_state: "R (running)"` and `wchan: "0"`, so the collected signal does not identify a PostgreSQL subsystem or a kernel/filesystem wait path. The workspace is Debian packaging-only and currently says `MAJOR_VER := 18`, while the evidence is for installed `17.9-0+deb13u1`.

## Evidence Confidence
inferred

## Proposed Subject
No source patch: collect richer stuck-backend diagnostics before changing PostgreSQL

## Patch Plan
No source patch in this pass. The evidence is insufficient to connect the reported D-state to PostgreSQL source behavior, and a speculative upstream patch would not be pull-request-ready.

I found no `CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, or `dev-docs/` in the prepared checkout or original snapshot. The checkout uses Debian packaging conventions: `debian/rules` includes `/usr/share/postgresql-common/server/postgresql.mk`, and source deltas are quilt patches listed in `debian/patches/series`. No prior Fixer patch was found. Existing local PostgreSQL helper usage in patches includes `pgstat_get_entry_ref_locked()` / `pgstat_unlock_entry()`, but the evidence does not implicate pgstat or locking.

The report should request/collect `/proc/$pid/stack`, `/proc/$pid/wchan`, `/proc/$pid/status`, `/proc/$pid/sched`, `/proc/$pid/io`, fd targets, `ps` STAT/WCHAN samples, relevant kernel logs, and PostgreSQL-side context such as `pg_stat_activity` and wait events if the postmaster is responsive.

## Risks
A source patch would be high-risk because the wait site is unknown and could be kernel, storage, filesystem, VM, or external IO related. The source tree mismatch, `postgresql-17` evidence vs PostgreSQL 18 packaging checkout, also blocks a clean upstream-style fix. No authentication, authorization, cryptography, sandboxing, permissions, or timing/throttling behavior should be touched.

## Validation
If later evidence justifies a patch, first try the reproducible package build entrypoint from the workspace root: `dpkg-buildpackage -us -uc -b`, with `debian/rules build` as the direct packaging build path. Then run the package test entrypoint `debian/tests/run-testsuite` where the required PostgreSQL common test

[truncated]

Issue page: /issues/019db82f-5349-7f23-99d2-cbd9fd09e2f4. Issue JSON: /v1/issues/019db82f-5349-7f23-99d2-cbd9fd09e2f4

python3.13 shows a repeated `D`-state wait, likely blocked in unknown uninterruptible wait via folio_wait_bit_common.

## 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.

Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `python3.13` 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.

Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `python3.13` 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 `python3.13` 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): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, 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 two `python3.13` processes stuck in `D (disk sleep)` for at least 146843s. The embedded kernel stack is `folio_wait_bit_common -> __folio_lock_or_retry -> do_swap_page -> handle_pte_fault`, which points to a kernel page-fault/swap wait. The evidence does not identify a Python frame, CPython lock, allocator path, module, syscall wrapper, or file I/O call site.

## Evidence Confidence
observed

## Proposed Subject
No source patch: diagnose the D-state wait as insufficient evidence for an upstream CPython change.

## Patch Plan
Do not edit CPython in this pass. A source patch would be speculative because the available evidence shows a Linux memory-management wait, not a CPython defect that can be tied to code.

Use the prior Fixer result for this same finding as the baseline and keep/improve its no-patch diagnosis rather than replacing it with a speculative mitigation. The prior run already reported that `./configure && make` succeeded and that a smoke process stayed runnable; this refinement should preserve the key limitation: Fixer observed the stuck process, but we did not independently reproduce the `D`-state/`folio_wait_bit_common` signal.

Contribution/style scan found root `README.rst`, `Doc/README.rst`, `Misc/README`, and `InternalDocs/string_interning.md`; no root `CONTRIBUTING`, `HACKING`, `README-hacking`, or `dev-docs` file was found. `README.rst` points contributors to the CPython Developer Guide and documents `./configure`, `make`, and `make test`. No relevant local helper applies because no touched subsystem is justified. If later evidence implicates CPython code, follow local conventions such as `_Py_open`/`_Py_read`/`_Py_write`/`_Py_fopen_obj`, `PyMem_*`/`PyObject_*` allocation APIs, `PyErr_*` error reporting, and `Py_BEGIN_ALLOW_THREADS` around blocking calls. No control-flow change is planned, so there is no reason to introduce awkward `goto` handling.

## Risks
A CPython patch based only on this evidence could misattribute a kernel, swap, storage, filesystem, or workload stall to Python and produce an upstream-unacceptable change.

Security-sensitive behavior is not implicated.

## Validation
Before any focused check, try the project-level entrypoint from the workspace root:

```sh
./configure && make
```

If it fails, report the exact command and dependency/generated-file failure. Then run the narrowest relevant smoke check with the built interpreter:

```sh
./python -c 'import os, sys; print(sys.version); print(next(line.strip() for line in open(f"/proc/{os.getpid()}/status") if line.startswith("State:")))'
```

This is only a bounded independent reproduction attempt. Do not claim `reproduced` unless a command actually shows the same `D (disk sleep)` / `folio_wait_bit_common` failure signal.

## Patch Pass

Subject: Diagnose python D-state wait as outside CPython

## Commit Message
No source change is included. Fixer observed `python3.13` stuck in uninterruptible sleep, with the available `/proc` kernel stack waiting in `folio_wait_bit_common` during `do_swap_page`. A folio is a Linux kernel memory-management unit; this stack means the task was blocked while the kernel resolved a faulted or swapped page.

That signal points at kernel memory management, swap, storage, filesystem, or workload pressure rather than a CPython loop, lock, allocator, or file I/O path that can be safely patched from this evidence.

## Evidence Confidence
observed

## Issue Connection
The exact collected signal is two `python3.13` processes in `D (disk sleep)` for at least 146843 seconds, with `wchan` set to `folio_wait_bit_common` and a kernel stack ending in page-fault and swap handling. The process had `/dev/null` and an application log file open, but the evidence does not include a Python traceback, CPython C frame, syscall wait, allocator path, or module-specific stack.

The cautious code-level inference is that the process was blocked in the kernel while servicing a page fault or swap-in. The raw investigation paths referenced by `evidence.json` were not present in this workspace, so I could not inspect any additional perf/strace artifacts beyond the embedded excerpts.

I followed the saved plan and made no source change. CPython contribution docs found here are `README.rst`, `Doc/README.rst`, `Misc/README`, and `InternalDocs/string_interning.md`; no root `CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, or `dev-docs/` guidance was found. No relevant local helper was applicable because no CPython subsystem is implicated; if later evidence points to CPython code, use established helpers such as `_Py_open`/`_Py_read`/`_Py_write`/`_Py_fopen_obj`, `PyMem_*`/`PyObject_*`, `PyErr_*`, and `Py_BEGIN_ALLOW_THREADS`.

The expected effect is no code behavior change; this leaves a focused diagnosis suitable for an upstream bug report instead of an unsafe speculative patch.

## Git Add Paths
None

## Validation
Ran the project-level entrypoint from the workspace root:

```sh
./configure && make
```

Result: exited `0` and built the interpreter. Configure/build reported environment-related optional module limitations: no `g++`, no `gdbm.h`, missing `_dbm`, `_gdbm`, and `_tkinter`, and `_ssl` was built then removed after import failed with `undefined symbol: TLSv1_method`. That is separate from the D-state evidence.

Bounded independent reproduction attempt:

```sh
./python -c 'import os, sys; print(sys.version); print(next(line.strip() for line in open(f"/proc/{os.getpid()}/status") if line.startswith("State:")))'
```

Result: completed normally and printed `State: R (running)`. This did not reproduce the `D (disk sleep)` / `folio_wait_bit_common` signal, so confidence remains `observed`, not `reproduced`.

Cleaned generated build outputs with `make distclean`; final `git status --short` reported no paths.

## Review Pass 1

RESULT: ok

The pass is acceptable as a no-patch diagnosis. The worktree has no source diff, `## Evidence Confidence` is present and set to `observed`, and the explanation stays within the evidence: `/proc` shows `D (disk sleep)` with `folio_wait_bit_common`/`do_swap_page`, but no CPython call path.

Validation is adequate for a diagnosis: the author ran `./configure && make`, reported the optional module/build-environment limitations, attempted a bounded process-state smoke check, and did not claim reproduction when it only showed `State: R (running)`. The response also names the contribution-doc scan and relevant CPython helper conventions while correctly saying no local helper applies because no subsystem is implicated.

## Plan Pass

## Problem
Fixer observed two `python3.13` processes stuck in `D (disk sleep)` for at least 146843s. The embedded kernel stack is `folio_wait_bit_common -> __folio_lock_or_retry -> do_swap_page -> handle_pte_fault`, which points to a kernel page-fault/swap wait. The evidence does not identify a Python frame, CPython lock, allocator path, module, syscall wrapper, or file I/O call site.

## Evidence Confidence
observed

## Proposed Subject
No source patch: diagnose the D-state wait as insufficient evidence for an upstream CPython change.

## Patch Plan
Do not edit CPython in this pass. A source patch would be speculative because the available evidence shows a Linux memory-management wait, not a CPython defect that can be tied to code.

Use the prior Fixer result for this same finding as the baseline and keep/improve its no-patch diagnosis rather than replacing it with a speculative mitigation. The prior run already reported that `./configure && make` succeeded and that a smoke process stayed runnable; this refinement should preserve the key limitation: Fixer observed the stuck process, but we did not independently reproduce the `D`-state/`folio_wait_bit_common` signal.

Contribution/style scan found root `README.rst`, `Doc/README.rst`, `Misc/README`, and `InternalDocs/string_interning.md`; no root `CONTRIBUTING`, `HACKING`, `README-hacking`, or `dev-docs` file was found. `README.rst` points contributors to the CPython Developer Guide and documents `./configure`, `make`, and `make test`. No relevant local helper applies because no touched subsystem is justified. If later evidence implicates CPython code, follow local conventions such as `_Py_open`/`_Py_read`/`_Py_write`/`_Py_fopen_obj`, `PyMem_*`/`PyObject_*` allocation APIs, `PyErr_*` error reporting, and `Py_BEGIN_ALLOW_THREADS` around blocking calls. No control-flow change is planned, so there is no reason to introduce awkward `goto` handling.

## Risks
A CPython patch based only on this evidence could misattribute a kernel, swap, storage, filesystem, or workload stall to Python and produce an upstream-unacceptable change.

Security-sensitive behavior is not implicated.

## Validation
Before any focused check, try the project-level entrypoint from the workspace root:

```sh
./configure && make
```

If it fails, report the exact command and dependency/generated-file failure. Then run the narrowe

[truncated]

Issue page: /issues/019d3b87-bcdb-7a01-8fd2-53d099979514. Issue JSON: /v1/issues/019d3b87-bcdb-7a01-8fd2-53d099979514

systemd-journald shows a repeated `D`-state wait, likely blocked in unknown uninterruptible wait via do_epoll_wait.

Issue page: /issues/019d9d27-781c-7040-a3c3-e4d59c1f7bad. Issue JSON: /v1/issues/019d9d27-781c-7040-a3c3-e4d59c1f7bad

python3.13 is stuck in a likely busy poll loop: 50.00% of sampled CPU passed through _PyEval_FrameClearAndPop, with repeated thread backtraces show 1 thread(s) around 0x00007f1c6e7efe92 in pthread_attr_destroy () from target:<path>.

## 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.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `supervisor` 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.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `supervisor` 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 `supervisor` upstream patch, not just a Debian-local workaround. 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/python3 /usr/bin/supervisord -n -c /etc/supervisor/supervisord.conf` at high CPU, but the bundled syscall evidence shows the normal `supervisord` loop sleeping in `poll(..., 1000)` and calling `wait4(..., WNOHANG)` once per second with `ECHILD`. That does not yet prove a Supervisor source bug or a Python runtime bug.

## Evidence Confidence
inferred

## Proposed Subject
No source patch yet: diagnose conflicting idle-loop evidence for `supervisord`.

## Patch Plan
Do not edit Supervisor in this pass unless a bounded reproduction first shows `Supervisor.runforever()` polling without blocking or repeatedly rebuilding/dispatching expensive state.

Investigation should stay in the script/application entrypoint first: `supervisor/supervisord.py`, `supervisor/poller.py`, and `supervisor/options.py::waitpid`. Treat Python 3.13 only as a secondary target because the evidence explicitly identifies `supervisord` as the script entrypoint but does not prove runtime mishandling.

Follow local conventions found in the tree: upstream contributions are via GitHub PRs per `README.rst` and `docs/development.rst`; tests use `pytest`; the loop uses Supervisor’s `options.poller` abstraction and `options.waitpid()` wrapper, not direct `select`/`os.waitpid` from `runforever`. No relevant local helper was found for throttling beyond the existing fixed `timeout = 1` loop delay and logger methods.

No prior Fixer patch was found. Debian has only `debian/patches/py313.patch`, a Python 3.13 test fix, unrelated to this CPU report.

Avoid awkward control flow if a later patch is justified: prefer a small bounded loop/test change over recursion/goto-like exits.

## Risks
A source patch based only on this bundle would likely “fix” normal idle Supervisor behavior: one-second `poll` timeouts and opportunistic `waitpid(WNOHANG)` reaping are expected.

Changing timing/throttling in the main loop is behavior-sensitive because it can affect signal handling, process reaping, event dispatch, and shutdown latency. Without reproduction and security/operational impact analysis, this should remain a no-patch diagnosis.

## Validation
First run the project test entrypoint from the workspace root: `python3 -m pytest`.

Then run focused tests if evidence justifies edits: `python3 -m pytest supervisor/tests/test_supervisord.py supervisor/tests/test_poller.py`.

Bounded independent reproduction attempt: run `supervisord` with `supervisor/tests/fixtures/donothing.conf` under `timeout` and `strace -f -tt -T -e poll,select,pselect6,wait4`, then verify whether `poll` blocks near one second and CPU stays low. Only claim `reproduced` if that command actually shows rapid nonblocking poll/wait churn or sustained CPU matching the Fixer signal.

## Patch Pass

Subject: No patch: diagnose supervisord idle-loop CPU evidence

## Commit Message
No source patch is included. The likely root cause is a misleading profiler classification rather than a demonstrated `supervisord` bug: the collected `/proc` data shows the process sleeping in `poll_schedule_timeout`, and the strace excerpt shows `poll(..., 1000)` blocking for about one second between `wait4(..., WNOHANG)` calls returning `ECHILD`.

I followed the saved plan. The touched subsystem uses Supervisor’s `options.poller` abstraction and `options.waitpid()` wrapper; no relevant local helper was missing. `README.rst` and `docs/development.rst` point upstream contributions to GitHub PRs, and tests are run with `pytest`.

## Evidence Confidence
inferred

## Issue Connection
The collected signal was a Python 3.13 `supervisord` process reported at high CPU with hot samples in `_PyEval_FrameClearAndPop`, plus a “busy-poll” classifier. The same bundle also shows `State: S (sleeping)`, `wchan: poll_schedule_timeout`, and repeated one-second `poll` timeouts followed by `wait4(..., WNOHANG)` returning `ECHILD`.

At the code level, that matches Supervisor’s normal main loop: `Supervisor.runforever()` registers readable/writable dispatchers through `options.poller`, polls with `timeout = 1`, then calls `self.reap()`, which uses the local `options.waitpid()` wrapper. This is timing/throttling behavior, so a source change would need reproduced evidence and impact analysis. I did not make a code change.

The expected effect is to avoid an upstream patch that changes Supervisor’s event-loop timing based on indirect and contradictory evidence. A stronger report should include a language-level stack or syscall trace showing rapid nonblocking loop iterations.

## Git Add Paths
None

## Validation
`python3 -m pytest` from the workspace root ran but failed: 1359 passed, 26 failed. The failures were existing environment/runtime blockers: Python 3.13 lacks `unittest.findTestCases`, and the sandbox denies socket creation with `PermissionError: [Errno 1] Operation not permitted`.

`python3 -m pytest supervisor/tests/test_supervisord.py supervisor/tests/test_poller.py -k 'not test_suite'` passed: 61 passed, 2 deselected.

Independent reproduction attempt with `strace -f -tt -T -e poll,select,pselect6,wait4 ...` was blocked by sandbox ptrace restrictions: `PTRACE_TRACEME: Operation not permitted` and `ptrace(PTRACE_SEIZE, 7): Operation not permitted`.

Fallback smoke check with `timeout 5s python3 -m supervisor.supervisord -n -c supervisor/tests/fixtures/donothing.conf ...` did not reproduce high CPU: `/usr/bin/time` reported `time_elapsed=5.08 user=0.06 sys=0.01 cpu=1%`.

## Review Pass 1

RESULT: ok

No source diff is present, which matches the `inferred` evidence level and the security-sensitive timing/throttling nature of Supervisor’s main loop. The response correctly avoids a speculative patch, names the relevant local abstractions (`options.poller`, `options.waitpid()`), cites the contribution docs checked, and explains the conflict between the high-CPU classifier and the strace `/proc` evidence showing one-second blocking polls.

Validation is acceptable for a no-patch diagnosis: project-level `python3 -m pytest` was attempted with exact blockers reported, focused loop tests passed, and an independent reproduction attempt was made with `strace` but blocked by ptrace restrictions, followed by a bounded low-CPU smoke check.

## Plan Pass

## Problem
Fixer observed `/usr/bin/python3 /usr/bin/supervisord -n -c /etc/supervisor/supervisord.conf` at high CPU, but the bundled syscall evidence shows the normal `supervisord` loop sleeping in `poll(..., 1000)` and calling `wait4(..., WNOHANG)` once per second with `ECHILD`. That does not yet prove a Supervisor source bug or a Python runtime bug.

## Evidence Confidence
inferred

## Proposed Subject
No source patch yet: diagnose conflicting idle-loop evidence for `supervisord`.

## Patch Plan
Do not edit Supervisor in this pass unless a bounded reproduction first shows `Supervisor.runforever()` polling without blocking or repeatedly rebuilding/dispatching expensive state.

Investigation should stay in the script/application entrypoint first: `supervisor/supervisord.py`, `supervisor/poller.py`, and `supervisor/options.py::waitpid`. Treat Python 3.13 only as a secondary target because the evidence explicitly identifies `supervisord` as the script entrypoint but does not prove runtime mishandling.

Follow local conventions found in the tree: upstream contributions are via GitHub PRs per `README.rst` and `docs/development.rst`; tests use `pytest`; the loop uses Supervisor’s `options.poller` abstraction and `options.waitpid()` wrapper, not direct `select`/`os.waitpid` from `runforever`. No relevant local helper was found for throttling beyond the existing fixed `timeout = 1` loop delay and logger methods.

No prior Fixer patch was found. Debian has only `debian/patches/py313.patch`, a Python 3.13 test fix, unrelated to this CPU report.

Avoid awkward control flow if a later patch is justified: prefer a small bounded loop/test change over recursion/goto-like exits.

## Risks
A source patch based only on this bundle would likely “fix” normal idle Supervisor behavior: one-second `poll` timeouts and opportunistic `waitpid(WNOHANG)` reaping are expected.

Changing timing/throttling in the main loop is behavior-sensitive because it can affect signal handling, process reaping, event dispatch, and shutdown latency. Without reproduction and security/operational impact analysis, this should remain a no-patch diagnosis.

## Validation
First run the project test entrypoint from the workspace root: `python3 -m pytest`.

Then run focused tests if evidence justifies edits: `python3 -m pytest supervisor/tests/test_supervisord.py supervisor/tests/test_po

[truncated]

Issue page: /issues/019dd062-04a8-7e03-b3a3-5bb273aa2f42. Issue JSON: /v1/issues/019dd062-04a8-7e03-b3a3-5bb273aa2f42

sshd-auth is stuck in a likely timer churn loop: 100.00% of sampled CPU passed through unresolved offset, with repeated read x5, write x5, clock_nanosleep x2.

## 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): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `openssh` 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.

Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `openssh` 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 `openssh` 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): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, 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 `sshd-auth` sleeping between failed authentication attempts and classified it as likely timer churn. The strace pattern matches OpenSSH’s intentional auth failure delay in `auth2.c`: `mm_auth_password()` sends `MONITOR_REQ_AUTHPASSWORD`, the monitor rejects it, then `ensure_minimum_time_since()` sleeps before sending `USERAUTH_FAILURE`.

## Evidence Confidence
observed

## Proposed Subject
No source patch: document the observed `sshd-auth` activity as expected authentication failure timing behavior unless an independent reproduction shows excessive wakeups or CPU outside the intentional delay path.

## Patch Plan
Do not edit files in this pass. This touches authentication timing/throttling behavior, so a source patch is security-sensitive and blocked without a reproducer plus security-impact analysis.

Relevant local conventions/helpers found: OpenSSH uses `monotime_double()` for elapsed time, `nanosleep()` for the bounded delay, `xmalloc()`/`freezero()` around digest state, `ssh_digest_memory()`, `mm_request_send()`/`mm_request_receive_expect()` for privsep monitor IPC, and `atomicio()` for complete fd I/O. No prior Fixer patch is present in the workspace (`git status` clean), so there is nothing to improve or replace.

If later evidence proves real excessive timer churn, patch only the narrow auth delay path in `auth2.c`, keeping the existing bounded control flow and avoiding awkward extra `goto` paths.

## Risks
Changing this code could weaken OpenSSH’s user-enumeration and authentication timing mitigations. The observed process CPU was only `0.2%`, process state was sleeping, and the strace shows delays before auth failure replies, so treating this as a confirmed runaway bug would be speculative.

## Validation
First try the project-level entrypoint from the workspace root: `./configure && make`.

If that fails due to missing dependencies or generated files, record the exact failure and then run the narrowest reproducible build, likely `make sshd-auth` after any successful configure step.

Bounded independent reproduction attempt: run a locally built `sshd` with an isolated test config on localhost, perform one invalid password authentication attempt under `strace -tt -T -e read,write,nanosleep,clock_nanosleep`, and verify whether the sleep occurs only after failed auth and before `USERAUTH_FAILURE`, with no high-CPU loop.

## Patch Pass

Subject: no-patch: diagnose sshd-auth auth failure delay

## Commit Message
No source change is proposed. The collected `sshd-auth` trace most likely shows the intentional failed-authentication delay, not an independently confirmed runaway timer. This path is authentication timing behavior, so changing it without a local reproducer and security-impact analysis would risk weakening OpenSSH’s timing protections.

## Evidence Confidence
observed

## Issue Connection
Fixer observed `sshd-auth: root [net]` with a short trace dominated by `clock_nanosleep`, `read`, and `write`; `/proc` showed the process sleeping with `wchan` at `unix_stream_read_generic`, and CPU was reported at only `0.2%`. The strace excerpt shows a monitor reply, a bounded sleep, then writes before the next password-like monitor request.

The cautious code-level explanation is that this matches `auth2.c` failed user-authentication handling. `input_userauth_request()` records `tstart`, password authentication goes through the privilege-separation monitor via `mm_auth_password()`, and failed non-`none` methods call `ensure_minimum_time_since(tstart, user_specific_delay(authctxt->user))` before `userauth_finish()` sends failure. “Privilege-separation monitor” here means the privileged sshd process that answers authentication requests from the restricted `sshd-auth` child.

I made no source change. This follows the saved plan: authentication timing/throttling is security-sensitive, the independent reproduction was blocked by the sandbox, and the available evidence does not prove excessive wakeups or CPU outside the intentional failure-delay path. The expected effect is that the repository remains unchanged until a reproducer or symbolized trace demonstrates a real defect rather than expected failed-auth timing behavior.

Local conventions checked: `README.md` is the only contribution/style document found by the requested patterns; the auth/monitor code uses OpenSSH helpers and conventions including `monotime_double()`, `xmalloc()`, `freezero()`, `ssh_digest_memory()`, `mm_request_send()`, `mm_request_receive_expect()`, and `atomicio()`. No prior Fixer patch was present, and `git status --short` is clean.

## Git Add Paths
None

## Validation
`./configure && make` from the workspace root failed immediately:
`configure: error: ./configure.ac newer than configure, run autoreconf`

Focused fallback `ls -l Makefile configure configure.ac && test -f Makefile && make sshd-auth` could not compile because there is no generated `Makefile` in the clean workspace.

Independent reproduction attempt: I tried to run an isolated localhost `sshd` under server-side `strace` and make one invalid password attempt with `sshpass`. It was blocked by sandbox permissions: `strace` reported `PTRACE_TRACEME: Operation not permitted` / `ptrace(PTRACE_SEIZE, 11): Operation not permitted`, and the client failed with `socket: Operation not permitted`. Therefore I did not independently reproduce the failure signal.

## Review Pass 1

RESULT: ok

No source diff is present, which is appropriate for this evidence level and subsystem. The author correctly treated authentication timing/throttling as security-sensitive, avoided an observed-only source patch, and explained the likely root cause from the perf/strace/proc evidence without claiming local reproduction.

Validation reporting is acceptable: `./configure && make` was attempted and failed with the exact stale-`configure` blocker, the focused compile was blocked by the missing `Makefile`, and the independent strace reproduction attempt was reported with exact sandbox blockers. The response also names the relevant local OpenSSH helpers and conventions.

## Plan Pass

## Problem
Fixer observed `sshd-auth` sleeping between failed authentication attempts and classified it as likely timer churn. The strace pattern matches OpenSSH’s intentional auth failure delay in `auth2.c`: `mm_auth_password()` sends `MONITOR_REQ_AUTHPASSWORD`, the monitor rejects it, then `ensure_minimum_time_since()` sleeps before sending `USERAUTH_FAILURE`.

## Evidence Confidence
observed

## Proposed Subject
No source patch: document the observed `sshd-auth` activity as expected authentication failure timing behavior unless an independent reproduction shows excessive wakeups or CPU outside the intentional delay path.

## Patch Plan
Do not edit files in this pass. This touches authentication timing/throttling behavior, so a source patch is security-sensitive and blocked without a reproducer plus security-impact analysis.

Relevant local conventions/helpers found: OpenSSH uses `monotime_double()` for elapsed time, `nanosleep()` for the bounded delay, `xmalloc()`/`freezero()` around digest state, `ssh_digest_memory()`, `mm_request_send()`/`mm_request_receive_expect()` for privsep monitor IPC, and `atomicio()` for complete fd I/O. No prior Fixer patch is present in the workspace (`git status` clean), so there is nothing to improve or replace.

If later evidence proves real excessive timer churn, patch only the narrow auth delay path in `auth2.c`, keeping the existing bounded control flow and avoiding awkward extra `goto` paths.

## Risks
Changing this code could weaken OpenSSH’s user-enumeration and authentication timing mitigations. The observed process CPU was only `0.2%`, process state was sleeping, and the strace shows delays before auth failure replies, so treating this as a confirmed runaway bug would be speculative.

## Validation
First try the project-level entrypoint from the workspace root: `./configure && make`.

If that fails due to missing dependencies or generated files, record the exact failure and then run the narrowest reproducible build, likely `make sshd-auth` after any successful configure step.

Bounded independent reproduction attempt: run a locally built `sshd` with an isolated test config on localhost, perform one invalid password authentication attempt under `strace -tt -T -e read,write,nanosleep,clock_nanosleep`, and verify whether the sleep occurs only after failed auth and before `USERAUTH_FAILURE`, with no hi

[truncated]

Issue page: /issues/019e6016-53b8-76e3-84e2-fdf4c48c1b40. Issue JSON: /v1/issues/019e6016-53b8-76e3-84e2-fdf4c48c1b40

sshd-session is stuck in a likely unclassified userspace loop: 17.88% of sampled CPU passed through _copy_from_user, with repeated thread backtraces show 1 thread(s) around 0x00007efcc509a7d2 in ?? () from target:<path>.

## 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): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `openssh` 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.

Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `openssh` 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 `openssh` 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): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, 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 an `sshd-session` process classified as a possible runaway userspace loop, but the collected signal is contradictory: the process state was sleeping in `poll_schedule_timeout`, strace captured only `restart_syscall(<... resuming interrupted poll ...>)`, and the target summary reported only `0.1%` total CPU across three `sshd-session` processes. The hot symbols were kernel-side `_copy_from_user` and `netlink_autobind`, with no resolved OpenSSH source frame.

## Evidence Confidence
observed

## Proposed Subject
No source patch yet: diagnose ambiguous `sshd-session` poll sample before changing privileged session code.

## Patch Plan
Do not edit source in this pass. This is security-sensitive because it involves the privileged sshd session process and authentication/session handling, and the current evidence does not identify a concrete OpenSSH defect or reproducible behavior.

Investigate by improving attribution first: map the stripped backtrace offsets if debug symbols are available, inspect the live/raw artifacts if present, and compare the sampled frames with `sshd-session.c`, `serverloop.c`, `monitor.c`, and `monitor_fdpass.c`.

Follow upstream OpenSSH conventions if later evidence justifies a patch: use existing helpers such as `ptimeout_*`, `channel_prepare_poll`, `fatal_f`/`error_f`/`debug*_f`, `xmalloc` wrappers, and existing bounded loop patterns. Avoid awkward control flow such as an avoidable `goto`; prefer a small, local condition or helper if a loop guard is eventually needed.

No prior Fixer patch is present in this workspace to improve or replace.

## Risks
A speculative source patch could alter sshd timing, session cleanup, privilege separation, or keepalive behavior without proving the observed issue is caused by OpenSSH.

The current sample may simply show an idle sshd child blocked in `poll`, a transient kernel/netlink cost, or missing symbols rather than a userspace spin.

## Validation
First try the project-level entrypoint from the workspace root: `./configure && make`.

If that fails due to missing dependencies or generated files, record the exact failing command and reason, then run the narrowest relevant build check such as compiling `sshd-session.o`, `serverloop.o`, and related monitor objects after configure.

For independent evidence collection, use a bounded local sshd smoke run only if safe: start a test `sshd` on localhost under `timeout`, attempt one controlled client connection, and sample the resulting `sshd-session` with `strace`/`ps` for repeated `poll` wakeups or CPU growth. Do not claim reproduction unless that command actually shows the runaway signal.

## Patch Pass

Subject: Diagnose ambiguous sshd-session poll sample

## Commit Message
No source patch is proposed. The collected data shows `sshd-session` sleeping in `poll`, not a proven OpenSSH userspace loop. Because this is privileged sshd session code and the failure was not reproduced, changing timing or monitor behavior would be speculative.

## Evidence Confidence
inferred

## Issue Connection
Fixer collected a perf/strace sample for `sshd-session: gis [priv]` classified as a possible runaway process. The concrete signal was a sleeping process in `poll_schedule_timeout`, one `restart_syscall(<... resuming interrupted poll ...>)`, unresolved userspace frames, and kernel hot symbols `_copy_from_user` and `netlink_autobind`.

The likely root cause is an ambiguous or false-positive profiler attribution around an interrupted blocking `poll`, possibly kernel/netlink work, not a demonstrated OpenSSH spin. Nearby OpenSSH code intentionally waits in `ppoll`/`poll` using local conventions such as `ptimeout_*`, `channel_prepare_poll`, and `fatal_f`/`error_f` logging.

No source change was made. This follows the saved plan: the area is security-sensitive because it involves privileged sshd session/authentication flow, and there is no reproduced failure or source-level cause. The expected effect is to avoid an unsafe speculative timing change and leave a focused upstream report path: reproduce with symbols/raw artifacts before patching.

## Git Add Paths
None

## Validation
`./configure && make` from the workspace root failed immediately:
`configure: error: ./configure.ac newer than configure, run autoreconf`

I did not run `autoreconf` because it would update generated files in a no-patch diagnosis pass.

Focused compile check also could not proceed:
`cc -fsyntax-only -I. -Iopenbsd-compat serverloop.c`
failed with:
`includes.h:19:10: fatal error: config.h: No such file or directory`

Independent reproduction attempt:
`timeout 5s sh -c 'for i in 1 2 3; do ps -C sshd-session -o pid=,stat=,pcpu=,wchan:32=,comm= 2>/dev/null || true; sleep 1; done'`

Result: no `sshd-session` process was present, so the runaway/poll signal was not reproduced locally. The raw investigation artifact directory named in `evidence.json` was also absent, and the installed `/usr/lib/openssh/sshd-session` binary was stripped with no matching debug file under `/usr/lib/debug/.build-id/`.

## Review Pass 1

RESULT: ok

No blocking findings.

The first pass correctly leaves no source diff for a security-sensitive `sshd-session` area because the evidence is indirect and not locally reproduced. `## Evidence Confidence` is valid (`inferred`), `## Git Add Paths` is `None`, and the write-up does not invent a crash, reproducer, or confirmed upstream bug.

I verified the worktree has no current diff. The author checked the project-level `./configure && make` entrypoint and reported the exact blocker, then attempted a focused compile and a bounded runtime signal check. The explanation also names relevant OpenSSH conventions/helpers (`ptimeout_*`, `channel_prepare_poll`, `fatal_f`/`error_f`) and matches the available `README.md` guidance.

## Plan Pass

## Problem
Fixer observed an `sshd-session` process classified as a possible runaway userspace loop, but the collected signal is contradictory: the process state was sleeping in `poll_schedule_timeout`, strace captured only `restart_syscall(<... resuming interrupted poll ...>)`, and the target summary reported only `0.1%` total CPU across three `sshd-session` processes. The hot symbols were kernel-side `_copy_from_user` and `netlink_autobind`, with no resolved OpenSSH source frame.

## Evidence Confidence
observed

## Proposed Subject
No source patch yet: diagnose ambiguous `sshd-session` poll sample before changing privileged session code.

## Patch Plan
Do not edit source in this pass. This is security-sensitive because it involves the privileged sshd session process and authentication/session handling, and the current evidence does not identify a concrete OpenSSH defect or reproducible behavior.

Investigate by improving attribution first: map the stripped backtrace offsets if debug symbols are available, inspect the live/raw artifacts if present, and compare the sampled frames with `sshd-session.c`, `serverloop.c`, `monitor.c`, and `monitor_fdpass.c`.

Follow upstream OpenSSH conventions if later evidence justifies a patch: use existing helpers such as `ptimeout_*`, `channel_prepare_poll`, `fatal_f`/`error_f`/`debug*_f`, `xmalloc` wrappers, and existing bounded loop patterns. Avoid awkward control flow such as an avoidable `goto`; prefer a small, local condition or helper if a loop guard is eventually needed.

No prior Fixer patch is present in this workspace to improve or replace.

## Risks
A speculative source patch could alter sshd timing, session cleanup, privilege separation, or keepalive behavior without proving the observed issue is caused by OpenSSH.

The current sample may simply show an idle sshd child blocked in `poll`, a transient kernel/netlink cost, or missing symbols rather than a userspace spin.

## Validation
First try the project-level entrypoint from the workspace root: `./configure && make`.

If that fails due to missing dependencies or generated files, record the exact failing command and reason, then run the narrowest relevant build check such as compiling `sshd-session.o`, `serverloop.o`, and related monitor objects after configure.

For independent evidence collection, use a bounded local sshd smoke run only if safe:

[truncated]

Issue page: /issues/019e6004-e859-76e0-9a37-00421840edc7. Issue JSON: /v1/issues/019e6004-e859-76e0-9a37-00421840edc7

sshd-session is stuck in a likely unclassified userspace loop: 19.46% of sampled CPU passed through unresolved offset, with repeated thread backtraces show 1 thread(s) around 0x00007f19f549a7d2 in ?? () from target:<path>.

## 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): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `openssh` 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.

Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `openssh` 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 `openssh` 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): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, 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 an installed Debian `sshd-session` process reported as CPU-hot, but the captured state is not a clear OpenSSH loop: the process was sleeping in `poll`/`restart_syscall`, CPU was only `0.1%`, and hot samples were mostly in `libnss_systemd.so.2` and kernel symbols. The relevant OpenSSH path is security-sensitive because it is `sshd-session` authentication/session setup, including PAM calls in `auth-pam.c`.

## Evidence Confidence
inferred

## Proposed Subject
No source patch yet: diagnose `sshd-session`/PAM/NSS poll sample before changing authentication-session code.

## Patch Plan
Do not edit OpenSSH in this pass. The evidence is profiler-only and does not identify a reproducible OpenSSH bug or a resolved source frame.

Before any source patch, collect stronger evidence: a symbolized backtrace for `/usr/lib/openssh/sshd-session` and `libnss_systemd.so.2`, process CPU over a longer interval, fd targets, and a bounded local ssh login/session reproduction that can show the same `poll`/`libnss_systemd` signal.

If later evidence proves an OpenSSH-owned loop, keep changes upstream-style in the relevant subsystem, likely `sshd-session.c`, `auth-pam.c`, or `monitor.c`. Follow local conventions found here: `fatal_f`/`fatal_fr`/`debug*_f` logging, `xmalloc`/`xcalloc` allocation helpers, `sshbuf` for structured messages, `atomicio` for fd writes, and existing bounded `poll` retry style in `monitor_read`. Avoid awkward `goto` control flow unless matching an established cleanup pattern.

No prior Fixer patch was found. Existing Debian patches touching `sshd-session` include GSSAPI, tcp-wrappers, SELinux role, Debian config path changes, and systemd socket activation, but none directly address this profiler signal and none should be replaced based on the current evidence.

## Risks
Changing PAM/NSS/session handling without reproduction risks authentication, authorization, credential, and session-environment regressions. Adding timeouts or bypasses around PAM/NSS calls would be security-sensitive and could break legitimate slow directory/systemd-user lookups. A source patch is blocked until the behavior is reproduced and its security impact is understood.

## Validation
First validation entrypoint after any future edit: `./configure && make` from the workspace root. If that fails due to missing dependencies or generated files, record the exact failing command and reason, then run the narrowest relevant reproducible target, likely `make sshd-session` after a successful configure.

Bounded independent reproduction before editing: build/run a local test `sshd` on a high localhost port with a temporary config, establish one session, then sample the spawned `sshd-session` for CPU, `wchan`, `strace`, and a symbolized backtrace. Do not claim reproduced unless that command actually shows the same `poll`/`libnss_systemd` signal.

## Patch Pass

Subject: Diagnose sshd-session poll sample before patching PAM session path

## Commit Message
The likely root cause is not yet an OpenSSH source loop. Fixer captured `sshd-session` sleeping in `poll`/`restart_syscall`, with hot samples in `libnss_systemd.so.2` and kernel code, which points more toward PAM/NSS/systemd activity or a normal monitor wait than a proven OpenSSH busy loop. Because this is authentication/session handling, no source patch is safe without reproduction.

## Evidence Confidence
inferred

## Issue Connection
The collected signal is a Debian `sshd-session: gis [priv]` process classified as a possible runaway process, but `/proc` and `strace` evidence show it sleeping in `poll`, with only one `restart_syscall` line over five seconds and sampled CPU at `0.1%`.

The cautious code-level inference is that the sample overlaps the PAM session path (`do_pam_setcred()` / `do_pam_session()`) or the privileged monitor’s normal `poll` wait, while the hottest resolved DSO is `libnss_systemd.so.2`, not OpenSSH. I followed the saved plan and did not change course: no source diff is left because the evidence is indirect and the touched area is security-sensitive.

I inspected `README.md`, `README.platform`, and nearby `sshd-session.c`, `auth-pam.c`, and `monitor.c`. Relevant local conventions include `fatal_f`/`fatal_fr`, `debug*_f`, `xmalloc`/`xcalloc`, `sshbuf`, `atomicio`, and the existing bounded `poll` retry style in `monitor_read`; no new APIs were introduced.

The expected effect is no runtime behavior change. This is a no-patch diagnosis suitable for an upstream report requesting stronger evidence: symbolized OpenSSH and `libnss_systemd` frames, longer CPU sampling, fd targets, and a reproducible PAM-enabled login/session trace.

## Git Add Paths
None

## Validation
`./configure && make` from the workspace root failed immediately: `configure: error: ./configure.ac newer than configure, run autoreconf`.

Fallback validation in a temporary copy:
`autoreconf` completed, with non-fatal warnings including obsolete `AC_TRY_COMPILE`.
`./configure` completed, but detected `PAM support: no` because PAM headers were missing (`pam/pam_appl.h` and `security/pam_appl.h` not found).
`make sshd-session` completed successfully in the temporary copy.

Independent reproduction attempt did not reproduce the failure. `ps -p 493336 ...` found no sampled process, `/proc/493336` was absent, and `pgrep -a sshd-session` found no current target. `timeout 5 strace -p 493336 -f -e trace=poll,ppoll,restart_syscall` also failed because ptrace is not permitted in the sandbox.

## Review Pass 1

RESULT: ok

No source changes are present, which is appropriate for the evidence level. The author classifies confidence as `inferred`, avoids a security-sensitive PAM/session patch without reproduction, and does not overstate the profiler/strace evidence.

Validation is acceptable for a no-patch diagnosis: the project-level `./configure && make` was attempted and the exact blocker was reported, followed by a focused build in a temporary copy. The reproduction attempt was also bounded and correctly reported as blocked/not reproduced.

## Plan Pass

## Problem
Fixer observed an installed Debian `sshd-session` process reported as CPU-hot, but the captured state is not a clear OpenSSH loop: the process was sleeping in `poll`/`restart_syscall`, CPU was only `0.1%`, and hot samples were mostly in `libnss_systemd.so.2` and kernel symbols. The relevant OpenSSH path is security-sensitive because it is `sshd-session` authentication/session setup, including PAM calls in `auth-pam.c`.

## Evidence Confidence
inferred

## Proposed Subject
No source patch yet: diagnose `sshd-session`/PAM/NSS poll sample before changing authentication-session code.

## Patch Plan
Do not edit OpenSSH in this pass. The evidence is profiler-only and does not identify a reproducible OpenSSH bug or a resolved source frame.

Before any source patch, collect stronger evidence: a symbolized backtrace for `/usr/lib/openssh/sshd-session` and `libnss_systemd.so.2`, process CPU over a longer interval, fd targets, and a bounded local ssh login/session reproduction that can show the same `poll`/`libnss_systemd` signal.

If later evidence proves an OpenSSH-owned loop, keep changes upstream-style in the relevant subsystem, likely `sshd-session.c`, `auth-pam.c`, or `monitor.c`. Follow local conventions found here: `fatal_f`/`fatal_fr`/`debug*_f` logging, `xmalloc`/`xcalloc` allocation helpers, `sshbuf` for structured messages, `atomicio` for fd writes, and existing bounded `poll` retry style in `monitor_read`. Avoid awkward `goto` control flow unless matching an established cleanup pattern.

No prior Fixer patch was found. Existing Debian patches touching `sshd-session` include GSSAPI, tcp-wrappers, SELinux role, Debian config path changes, and systemd socket activation, but none directly address this profiler signal and none should be replaced based on the current evidence.

## Risks
Changing PAM/NSS/session handling without reproduction risks authentication, authorization, credential, and session-environment regressions. Adding timeouts or bypasses around PAM/NSS calls would be security-sensitive and could break legitimate slow directory/systemd-user lookups. A source patch is blocked until the behavior is reproduced and its security impact is understood.

## Validation
First validation entrypoint after any future edit: `./configure && make` from the workspace root. If that fails due to missing dependencies or generated files, record

[truncated]

Issue page: /issues/019e5500-abf8-7a11-8504-fbba3c540a4f. Issue JSON: /v1/issues/019e5500-abf8-7a11-8504-fbba3c540a4f

sshd-session is stuck in a likely unclassified userspace loop: 10.43% of sampled CPU passed through truncate_inode_pages_range, with repeated thread backtraces show 1 thread(s) around 0x00007f2b2e89a7d2 in ?? () from target:<path>.

## 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): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `openssh` 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.

Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `openssh` 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 `openssh` 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): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, 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/lib/openssh/sshd-session` as a runaway CPU candidate, but the evidence excerpt shows the sampled process in `S (sleeping)`, `wchan=poll_schedule_timeout`, one `restart_syscall` from an interrupted `poll`, and only `0.1%` total CPU across three `sshd-session` processes. The hottest samples are kernel/libaudit symbols, not a resolved OpenSSH loop.

## Evidence Confidence
inferred

## Proposed Subject
No source patch: insufficient evidence for an OpenSSH `sshd-session` runaway loop.

## Patch Plan
Do not edit source in this pass. Treat this as a diagnosis/report plan unless additional evidence shows a concrete OpenSSH loop.

Relevant inspection:
- Entrypoint/subsystem: `sshd-session.c`, `serverloop.c`, `monitor.c`, `audit-linux.c`.
- Local helpers/conventions: `ptimeout_*` for `poll`/`ppoll` deadlines, `sshbuf`/`atomicio` for monitor IPC, `fatal_f`/`debug_f` logging, OpenBSD style per `README`.
- Contribution docs: `README` points patches to Bugzilla or `openssh-unix-dev` and OpenBSD `style.9`; `README.md` documents `./configure && make && make tests`; `SECURITY.md` points security issues to OpenSSH security reporting.
- Prior Fixer patch: none found in the workspace.

Reasoning: the evidence does not identify a failing caller, an actionable busy loop, or a reproducible source-level condition. The monitor/server event loops intentionally block in `poll`/`ppoll`; patching authentication/audit/session behavior from this signal would be security-sensitive and not pull-request-ready. No awkward control-flow change such as a speculative `goto` should be introduced.

## Risks
A source patch here would risk changing privileged session, audit, or monitor behavior without proof of a bug. It could also mask a kernel, libaudit, auditd, PAM/systemd, or profiler attribution issue.

## Validation
If new evidence justifies a patch, first run the project entrypoint from the workspace root:

`./configure && make`

If that fails due to missing dependencies or generated files, record the exact failure and then run the narrowest relevant compile. For independent reproduction, use a bounded local sshd/ssh smoke run with tracing or sampling to prove repeated CPU consumption in `sshd-session`; do not claim reproduction if it only shows expected blocking in `poll`/`ppoll`.

## Patch Pass

Subject: no patch: diagnose sshd-session poll sample

## Commit Message
No source change. The collected evidence points to an `sshd-session` process sleeping in `poll`, not to a confirmed OpenSSH busy loop. The likely root cause is profiler attribution around an idle privileged monitor or session wait, with kernel/libaudit samples present, rather than a resolved userspace loop in OpenSSH.

## Evidence Confidence
inferred

## Issue Connection
Fixer collected a perf/strace/proc signal for `sshd-session: gis [priv]`: the process was in `S (sleeping)`, `wchan` was `poll_schedule_timeout`, strace captured only `restart_syscall(<... resuming interrupted poll ...>)`, and total CPU for three `sshd-session` processes was `0.1%`. The hot symbols included kernel `truncate_inode_pages_range` and `libaudit` `audit_value_needs_encoding@plt`, but the backtrace did not resolve to a specific OpenSSH loop.

The cautious code-level inference is that this matches expected blocking wait behavior in the session/monitor path, not an actionable runaway loop. `serverloop.c` uses `ppoll()` through the local `ptimeout_*` helpers, and `monitor.c` uses `poll(..., -1)` while waiting for monitor/log IPC with `sshbuf`/`atomicio` conventions. The Linux audit path is authentication/session-adjacent and security-sensitive, so changing it from indirect evidence would not be upstreamable.

I followed the saved plan and did not leave a source diff. The expected effect is that this proposal remains a report-quality diagnosis instead of introducing a speculative change to privileged sshd session behavior.

## Git Add Paths
None

## Validation
Ran project-level entrypoint from the workspace root:

`./configure && make`

Result: failed before compilation with:

`configure: error: ./configure.ac newer than configure, run autoreconf`

No focused compile was run because `Makefile` is missing until `configure` succeeds, and there is no source patch to compile. Running `autoreconf` in this no-patch diagnosis would modify generated files without improving the evidence.

Independent reproduction attempt:
`ps -p 762455,762480,782602 -o pid=,stat=,pcpu=,wchan=,comm=,args=` produced no rows; `pgrep -a sshd-session` also found no live `sshd-session` process. The raw investigation directory referenced by `evidence.json` is absent (`missing investigation directory`), so the failure signal could not be independently reproduced.

## Review Pass 1

RESULT: ok

The first pass is acceptable as a no-patch diagnosis. The workspace has no source diff, `## Evidence Confidence` is validly set to `inferred`, and the explanation does not overclaim beyond the profiler/strace/proc evidence.

The response correctly treats the sshd session/audit/monitor area as security-sensitive and avoids a speculative source patch. It also reports the project-level validation command and exact blocker: `./configure && make` failed because `configure.ac` is newer than `configure`. The independent reproduction attempt is bounded and appropriately reported as not reproduced.

## Plan Pass

## Problem
Fixer flagged `/usr/lib/openssh/sshd-session` as a runaway CPU candidate, but the evidence excerpt shows the sampled process in `S (sleeping)`, `wchan=poll_schedule_timeout`, one `restart_syscall` from an interrupted `poll`, and only `0.1%` total CPU across three `sshd-session` processes. The hottest samples are kernel/libaudit symbols, not a resolved OpenSSH loop.

## Evidence Confidence
inferred

## Proposed Subject
No source patch: insufficient evidence for an OpenSSH `sshd-session` runaway loop.

## Patch Plan
Do not edit source in this pass. Treat this as a diagnosis/report plan unless additional evidence shows a concrete OpenSSH loop.

Relevant inspection:
- Entrypoint/subsystem: `sshd-session.c`, `serverloop.c`, `monitor.c`, `audit-linux.c`.
- Local helpers/conventions: `ptimeout_*` for `poll`/`ppoll` deadlines, `sshbuf`/`atomicio` for monitor IPC, `fatal_f`/`debug_f` logging, OpenBSD style per `README`.
- Contribution docs: `README` points patches to Bugzilla or `openssh-unix-dev` and OpenBSD `style.9`; `README.md` documents `./configure && make && make tests`; `SECURITY.md` points security issues to OpenSSH security reporting.
- Prior Fixer patch: none found in the workspace.

Reasoning: the evidence does not identify a failing caller, an actionable busy loop, or a reproducible source-level condition. The monitor/server event loops intentionally block in `poll`/`ppoll`; patching authentication/audit/session behavior from this signal would be security-sensitive and not pull-request-ready. No awkward control-flow change such as a speculative `goto` should be introduced.

## Risks
A source patch here would risk changing privileged session, audit, or monitor behavior without proof of a bug. It could also mask a kernel, libaudit, auditd, PAM/systemd, or profiler attribution issue.

## Validation
If new evidence justifies a patch, first run the project entrypoint from the workspace root:

`./configure && make`

If that fails due to missing dependencies or generated files, record the exact failure and then run the narrowest relevant compile. For independent reproduction, use a bounded local sshd/ssh smoke run with tracing or sampling to prove repeated CPU consumption in `sshd-session`; do not claim reproduction if it only shows expected blocking in `poll`/`ppoll`.

## Patch Pass

Subject: no patch: diagnose sshd-session poll sample

[truncated]

Issue page: /issues/019e5b4d-6246-75b1-9f7c-e4a8d5a2e4a9. Issue JSON: /v1/issues/019e5b4d-6246-75b1-9f7c-e4a8d5a2e4a9

sshd-auth is stuck in a likely busy poll loop: 100.00% of sampled CPU passed through tcp_event_new_data_sent, with repeated read x5, write x5, clock_nanosleep x2.

## 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): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `openssh` 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.

Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `openssh` 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 `openssh` 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): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, 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
`sshd-auth` was flagged as a runaway/busy-poll process, but the bundle shows `max_cpu_percent: 0.1`, process state `S (sleeping)`, `wchan: unix_stream_read_generic`, and a short strace with blocking `read()` calls plus authentication-delay `clock_nanosleep()` before failure writes. This points more to normal preauth/userauth timing behavior than a confirmed CPU loop.

## Evidence Confidence
inferred

## Proposed Subject
No source patch yet: diagnose likely false-positive busy-loop classification for `sshd-auth` authentication delay/blocking I/O.

## Patch Plan
Do not edit OpenSSH source in this pass. A source patch would touch authentication timing/throttling behavior, which is security-sensitive, and the evidence does not reproduce a runaway loop or high CPU condition.

Document that the observed `clock_nanosleep()` matches `auth2.c`’s `ensure_minimum_time_since()` failed-auth delay, while the repeated `read`/`write` pattern matches normal SSH packet exchange and disconnect handling. The literal `ichliebedich` write is not from OpenSSH source in this tree and appears to be packet payload seen by strace, not a local constant.

Follow upstream style if later evidence proves a real issue: use existing helpers/conventions such as `monotime_double()`, `ssh_packet_write_wait()`, `sshpkt_*`, `sshbuf`, `xmalloc/freezero`, and `fatal_fr`/`debug*_f`. Avoid adding new awkward cleanup `goto`; existing `goto out` cleanup in auth parsers is local convention, but no new control-flow change is justified now.

No prior Fixer patch was found in the workspace to improve or replace.

## Risks
Changing failed-auth delay, packet flushing, or preauth dispatch behavior without reproduction could weaken timing-throttling protections or introduce authentication regressions.

The evidence bundle is profiler-only/indirect for the claimed busy loop: no userspace backtrace, no raw artifact files available under the referenced `sshd-auth` investigation path, and the captured sample exits cleanly after connection reset.

## Validation
Before any future edit, run the project entrypoint from the workspace root: `./configure && make`. If it fails, record the exact configure/build failure and then run the narrowest reproducible compile target, likely `make sshd-auth auth2.o packet.o dispatch.o`.

Independent cheap reproduction attempt: build, start a local test `sshd` on a high port with temporary host keys/config, perform one failed local authentication under `strace -ttT -f -e read,write,ppoll,nanosleep,clock_nanosleep`, and verify whether the signal is just blocking reads plus bounded auth delay rather than sustained CPU spin. Do not claim reproduced unless that command shows the runaway behavior.

## Patch Pass

Subject: No patch: diagnose sshd-auth busy-loop evidence

## Commit Message
No source change is safe here. The likely root cause is an over-classified profiler signal: the captured `sshd-auth` process was sleeping with 0.1% CPU, blocked in `unix_stream_read_generic`, and its strace shows normal SSH packet reads/writes plus failed-authentication delay from `auth2.c`.

Changing this area would affect authentication timing/throttling, so it needs reproduced evidence and security-impact analysis first.

## Evidence Confidence
inferred

## Issue Connection
Fixer collected a `sshd-auth` trace labelled as a likely busy-poll loop, with sampled kernel time in `tcp_event_new_data_sent` and a short syscall sequence of `read`, `clock_nanosleep`, and `write`. The same evidence also shows the process in sleeping state, `max_cpu_percent: 0.1`, `wchan: unix_stream_read_generic`, blocking reads up to 1.67s, and a clean exit after `ECONNRESET`.

The cautious code-level inference is that the `clock_nanosleep()` entries correspond to `auth2.c`’s `ensure_minimum_time_since()` failed-auth delay, while the reads/writes correspond to normal packet exchange through local helpers such as `ssh_packet_write_wait()`, `sshpkt_*`, and dispatch handling. I did not make a source change because this touches authentication timing, and the failure was not reproduced locally.

The expected effect is a no-patch diagnosis suitable for upstream review instead of a speculative authentication change. I followed the saved plan and did not change course.

## Git Add Paths
None

## Validation
Checked project docs and subsystem conventions: `README.md` documents the portable OpenSSH build flow; `SECURITY.md` points security issues to OpenSSH security reporting. Relevant local helpers/conventions found include `monotime_double()`, `ssh_packet_write_wait()`, `sshpkt_*`, `sshbuf`, `xmalloc/freezero`, and `fatal_fr`/`debug*_f`.

Project-level validation attempted from workspace root:

`./configure && make`

It failed before build:

`configure: error: ./configure.ac newer than configure, run autoreconf`

Focused compile attempted:

`cc -fsyntax-only -I. -Iopenbsd-compat auth2.c`

It failed because configure did not generate `config.h`:

`includes.h:19:10: fatal error: config.h: No such file or directory`

Independent reproduction attempted with a temporary loopback `sshd` under:

`strace -f -ttT -e trace=read,write,ppoll,nanosleep,clock_nanosleep ... /usr/sbin/sshd -D -e -f <temp config>`

It was blocked by sandbox permissions: `PTRACE_TRACEME: Operation not permitted`, `ptrace(PTRACE_SEIZE, 10): Operation not permitted`, and the loopback ssh client failed with `socket: Operation not permitted`. Worktree remained clean.

## Review Pass 1

RESULT: ok

No source changes are present in the worktree, and the author correctly returned a no-patch diagnosis for inferred, security-sensitive authentication timing evidence.

The response includes the required sections, uses valid `## Evidence Confidence` value `inferred`, lists `None` under `## Git Add Paths`, does not claim reproduction, and reports the exact project-level validation blocker for `./configure && make`. The no-patch conclusion matches the evidence: low CPU, sleeping process, blocking reads, bounded sleeps, and no local reproduction.

## Plan Pass

## Problem
`sshd-auth` was flagged as a runaway/busy-poll process, but the bundle shows `max_cpu_percent: 0.1`, process state `S (sleeping)`, `wchan: unix_stream_read_generic`, and a short strace with blocking `read()` calls plus authentication-delay `clock_nanosleep()` before failure writes. This points more to normal preauth/userauth timing behavior than a confirmed CPU loop.

## Evidence Confidence
inferred

## Proposed Subject
No source patch yet: diagnose likely false-positive busy-loop classification for `sshd-auth` authentication delay/blocking I/O.

## Patch Plan
Do not edit OpenSSH source in this pass. A source patch would touch authentication timing/throttling behavior, which is security-sensitive, and the evidence does not reproduce a runaway loop or high CPU condition.

Document that the observed `clock_nanosleep()` matches `auth2.c`’s `ensure_minimum_time_since()` failed-auth delay, while the repeated `read`/`write` pattern matches normal SSH packet exchange and disconnect handling. The literal `ichliebedich` write is not from OpenSSH source in this tree and appears to be packet payload seen by strace, not a local constant.

Follow upstream style if later evidence proves a real issue: use existing helpers/conventions such as `monotime_double()`, `ssh_packet_write_wait()`, `sshpkt_*`, `sshbuf`, `xmalloc/freezero`, and `fatal_fr`/`debug*_f`. Avoid adding new awkward cleanup `goto`; existing `goto out` cleanup in auth parsers is local convention, but no new control-flow change is justified now.

No prior Fixer patch was found in the workspace to improve or replace.

## Risks
Changing failed-auth delay, packet flushing, or preauth dispatch behavior without reproduction could weaken timing-throttling protections or introduce authentication regressions.

The evidence bundle is profiler-only/indirect for the claimed busy loop: no userspace backtrace, no raw artifact files available under the referenced `sshd-auth` investigation path, and the captured sample exits cleanly after connection reset.

## Validation
Before any future edit, run the project entrypoint from the workspace root: `./configure && make`. If it fails, record the exact configure/build failure and then run the narrowest reproducible compile target, likely `make sshd-auth auth2.o packet.o dispatch.o`.

Independent cheap reproduction attempt: build, start a local test `ssh

[truncated]

Issue page: /issues/019e5b4d-626d-7493-8c66-015e945a13ab. Issue JSON: /v1/issues/019e5b4d-626d-7493-8c66-015e945a13ab

python3.13 is stuck in a likely busy poll loop: 100.00% of sampled CPU passed through unresolved offset, with repeated thread backtraces show 1 thread(s) around 0x00007f091ce537d2 in ?? () from target:<path>.

## 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.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `supervisor` 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.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `supervisor` 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 `supervisor` upstream patch, not just a Debian-local workaround. 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 `supervisord` under `/usr/bin/python3.13` in a repeated `poll -> wait4 -> poll` pattern. The captured strace shows `poll(..., 1000)` timing out after about one second, then `wait4(-1, ..., WNOHANG)` returning `ECHILD`; the profile target also reports only 0.2% CPU. That looks like Supervisor’s normal idle main loop rather than a proven runaway CPU bug.

## Evidence Confidence
observed

## Proposed Subject
No source patch: diagnose the evidence as an observed idle polling/reaping loop unless an independent reproduction shows materially elevated CPU or zero/near-zero poll timeouts.

## Patch Plan
Do not edit files in this pass. The evidence does not currently justify an upstream source patch: `supervisor/supervisord.py` intentionally polls once per second, then calls `Supervisor.reap()`, which uses the local `ServerOptions.waitpid()` helper in `supervisor/options.py` to reap children with `os.waitpid(-1, os.WNOHANG)`. The observed `ECHILD` path is already handled by returning `(None, None)`.

If later evidence shows actual high CPU, investigate a narrow change around the existing helpers rather than adding ad hoc process or polling code: keep using `self.options.poller.poll(timeout)`, `ServerOptions.waitpid()`, `SignalReceiver`, and the bundled medusa asyncore socket map conventions. Avoid awkward control flow such as `goto`-style flag ladders; a bounded helper or explicit conditional around known child state would be preferable if a real excessive-reap case is proven.

No prior Fixer patch appears present. The existing Debian `py313.patch` is unrelated Python 3.13 test compatibility work and should not be expanded for this profiler-only finding.

## Risks
Changing the idle poll or reap cadence without a reproduced failure could delay child exit detection, signal handling, event ticks, or HTTP/XML-RPC responsiveness. This is timing-sensitive behavior, so a source patch should be blocked until validation can reproduce the claimed runaway behavior and show that the change preserves Supervisor’s process-management semantics.

## Validation
Before any focused checks, run the project test entrypoint from the workspace root: `python3 -m pytest`.

Focused checks, if new evidence later justifies edits: `python3 -m pytest supervisor/tests/test_supervisord.py supervisor/tests/test_poller.py`.

Bounded independent reproduction attempt: run `python3 -m supervisor.supervisord -n -c supervisor/tests/fixtures/donothing.conf` under a short `timeout` plus `strace -tt -e poll,wait4` or equivalent, and confirm whether it actually spins or simply blocks in one-second polls with low CPU. Do not claim `reproduced` unless that command shows the high-CPU failure signal, not merely the normal idle loop.

## Patch Pass

Subject: diagnose supervisord idle poll trace without code change

## Commit Message
The likely root cause is an idle Supervisor event loop, not a proven runaway CPU bug. `supervisord` waits in its poller for one second, then performs a nonblocking child reap; when no children exist, `waitpid` returns `ECHILD`, which the existing code already treats as no work.

No source patch is left because changing this timing-sensitive loop without a reproduced failure could regress child reaping, signal handling, event ticks, or RPC responsiveness.

## Evidence Confidence
inferred

## Issue Connection
Fixer collected perf, strace, and `/proc` evidence for `/usr/bin/python3 /usr/bin/supervisord -n -c /etc/supervisor/supervisord.conf`. The exact signal was a repeated `poll -> wait4 -> poll` sequence, with `poll(..., 1000)` sleeping for about one second, `wait4(-1, ..., WNOHANG)` returning `ECHILD`, process state `S (sleeping)`, wait channel `poll_schedule_timeout`, and only 0.2% total CPU reported for the profile target.

The code-level inference is that this is Supervisor’s normal idle loop in `supervisor/supervisord.py`: `runforever()` uses the project `Poller` wrapper, then calls `Supervisor.reap()`, which uses the local `ServerOptions.waitpid()` helper in `supervisor/options.py`. `ECHILD` is already handled there as a benign no-child result. The console script entrypoint maps `supervisord` to `supervisor.supervisord:main`; I inspected the application entrypoint first and found no evidence that the Python runtime itself mishandles this workload.

I made no source change. The expected effect is to avoid an ungrounded timing/throttling patch and leave a report suitable for upstream: stronger evidence would need to show zero or near-zero poll timeouts, sustained high CPU, or a language-level stack tying real spin behavior to Supervisor logic. `docs/development.rst` points contributors to GitHub issues and pull requests; no separate coding-style helper was found. Relevant local helpers/conventions are `self.options.poller.poll()`, `ServerOptions.waitpid()`, `SignalReceiver`, and the bundled medusa asyncore socket map.

## Git Add Paths
None

## Validation
`python3 -m pytest` from the workspace root ran and failed: 1359 passed, 26 failed. The blockers were unrelated to this diagnosis: Python 3.13 no longer provides `unittest.findTestCases`, and the sandbox denies socket creation/bind operations with `PermissionError: [Errno 1] Operation not permitted`.

Independent reproduction attempt:
`timeout 5s strace -tt -f -e poll,wait4 python3 -m supervisor.supervisord -n -c supervisor/tests/fixtures/donothing.conf` could not run because ptrace is blocked: `PTRACE_TRACEME: Operation not permitted`.

Fallback smoke check:
`python3 -m supervisor.supervisord -n -c supervisor/tests/fixtures/donothing.conf`, sampled after 8 seconds with `ps`, showed the process sleeping in `poll_s` with `0.6%` CPU, then it exited cleanly on `SIGTERM`. This did not reproduce a runaway CPU failure.

## Review Pass 1

RESULT: ok

No source changes are present, and the author response is consistent with the evidence limits. It correctly avoids a timing-sensitive Supervisor loop patch without reproduced runaway behavior, names the relevant local helpers (`Poller`, `ServerOptions.waitpid()`, `SignalReceiver`, medusa asyncore socket map), reports the project-level test command and blockers, and documents the blocked `strace` reproduction attempt plus fallback smoke check.

## Plan Pass

## Problem
Fixer observed `supervisord` under `/usr/bin/python3.13` in a repeated `poll -> wait4 -> poll` pattern. The captured strace shows `poll(..., 1000)` timing out after about one second, then `wait4(-1, ..., WNOHANG)` returning `ECHILD`; the profile target also reports only 0.2% CPU. That looks like Supervisor’s normal idle main loop rather than a proven runaway CPU bug.

## Evidence Confidence
observed

## Proposed Subject
No source patch: diagnose the evidence as an observed idle polling/reaping loop unless an independent reproduction shows materially elevated CPU or zero/near-zero poll timeouts.

## Patch Plan
Do not edit files in this pass. The evidence does not currently justify an upstream source patch: `supervisor/supervisord.py` intentionally polls once per second, then calls `Supervisor.reap()`, which uses the local `ServerOptions.waitpid()` helper in `supervisor/options.py` to reap children with `os.waitpid(-1, os.WNOHANG)`. The observed `ECHILD` path is already handled by returning `(None, None)`.

If later evidence shows actual high CPU, investigate a narrow change around the existing helpers rather than adding ad hoc process or polling code: keep using `self.options.poller.poll(timeout)`, `ServerOptions.waitpid()`, `SignalReceiver`, and the bundled medusa asyncore socket map conventions. Avoid awkward control flow such as `goto`-style flag ladders; a bounded helper or explicit conditional around known child state would be preferable if a real excessive-reap case is proven.

No prior Fixer patch appears present. The existing Debian `py313.patch` is unrelated Python 3.13 test compatibility work and should not be expanded for this profiler-only finding.

## Risks
Changing the idle poll or reap cadence without a reproduced failure could delay child exit detection, signal handling, event ticks, or HTTP/XML-RPC responsiveness. This is timing-sensitive behavior, so a source patch should be blocked until validation can reproduce the claimed runaway behavior and show that the change preserves Supervisor’s process-management semantics.

## Validation
Before any focused checks, run the project test entrypoint from the workspace root: `python3 -m pytest`.

Focused checks, if new evidence later justifies edits: `python3 -m pytest supervisor/tests/test_supervisord.py supervisor/tests/test_poller.py`.

Bounded independent reproduction 

[truncated]

Issue page: /issues/019dc2a0-9ae7-7f42-8f59-415fe22abe51. Issue JSON: /v1/issues/019dc2a0-9ae7-7f42-8f59-415fe22abe51

sshd-session is stuck in a likely unclassified userspace loop: 17.12% of sampled CPU passed through __list_del_entry_valid_or_report, with repeated thread backtraces show 1 thread(s) around 0x00007f5005c9a7d2 in ?? () from target:<path>.

## 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): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `openssh` 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.

Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `openssh` 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 `openssh` 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): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, 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/lib/openssh/sshd-session` as a runaway CPU candidate, but the bundle is internally weak for an OpenSSH source bug: sampled CPU was only `0.2%`, process state was sleeping, `wchan` was `poll_schedule_timeout.constprop.0`, and strace captured only `restart_syscall(<... resuming interrupted poll ...>)`. The visible stack maps to the normal `serverloop.c` `ppoll()` wait path, not a confirmed busy loop.

## Evidence Confidence
inferred

## Proposed Subject
No source patch yet: report/diagnose suspected false-positive or insufficient evidence for `sshd-session` runaway CPU.

## Patch Plan
Do not edit OpenSSH in this pass. The evidence does not demonstrate a reproducible userspace loop, and this area is security-sensitive because it touches server session event-loop timing.

If later evidence shows real poll spinning, investigate `serverloop.c::wait_until_can_do_something()` and `channels.c::{channel_prepare_poll,channel_after_poll}` first. Follow existing OpenSSH conventions: `ptimeout_*` for poll deadlines, `monotime()`/`monotime_ts()` for clocks, `fatal_f`/`debug*`/`logit` for diagnostics, and `xrecallocarray` for pollfd allocation. Avoid awkward control flow such as avoidable `goto`; nearby code has bounded helpers and direct returns for this path.

No prior Fixer patch was found in the workspace to improve or replace. I did notice a suspicious local channel poll detail in `channels.c` where the `sock` branch computes `ev` but assigns `pfd[p].events = 0`; that deserves separate investigation only if tied to fresh evidence, because the current bundle shows sleeping in poll rather than confirmed missed readiness or spin.

## Risks
A speculative event-loop patch could alter SSH session liveness, keepalive, rekey, child reap, or channel readiness behavior without a proven failure. That could create regressions in authentication/session handling or timing-sensitive server behavior.

## Validation
Before any future patch, try the project entrypoint from the workspace root:

```sh
./configure && make
```

If that fails due to missing dependencies or generated files, record the exact failure, then run the narrowest reproducible build such as:

```sh
make sshd-session
```

Bounded independent reproduction attempt: after building, run a local test `sshd`/`ssh` session under `timeout` and `strace -c` or `perf stat` to verify whether `sshd-session` actually spins or remains blocked in `ppoll()`. Do not claim `reproduced` unless that command shows repeated immediate poll wakeups or sustained CPU in the built `sshd-session`.

## Patch Pass

Subject: diagnose sshd-session poll wait evidence

## Commit Message
No source change is included. The collected evidence points at an `sshd-session` process sleeping in the server poll loop, not at a reproduced userspace spin. Because changing this area would affect SSH session timing behavior, this should remain a diagnosis/report until a local reproduction or stronger trace shows repeated immediate poll wakeups.

## Evidence Confidence
inferred

## Issue Connection
The collected signal was a Fixer runaway-process investigation for `/usr/lib/openssh/sshd-session`: perf sampled kernel symbols, strace saw only `restart_syscall(<... resuming interrupted poll ...>)`, `/proc` reported state `S (sleeping)`, and `wchan` was `poll_schedule_timeout.constprop.0`. The sampled CPU was also only `0.2%`.

The cautious code-level inference is that this process was blocked in OpenSSH’s normal server event loop, where `serverloop.c::wait_until_can_do_something()` prepares channel file descriptors and sleeps in `ppoll()`. I inspected the nearby subsystem and found the expected OpenSSH helpers and conventions: `ptimeout_*` for poll deadlines, `monotime()`/`monotime_ts()` for time, `channel_prepare_poll()`/`channel_after_poll()` for channel readiness, `xrecallocarray()` for pollfd allocation, and `fatal_f`/`debug*`/`logit` for diagnostics.

No change was made. This follows the saved plan rather than drifting from it: the evidence is profiler/strace/proc-state data only, and it does not reproduce a timing/throttling bug. The expected effect is that this proposal avoids landing a speculative OpenSSH session-loop patch without a demonstrated failure mode. A separate suspicious line in `channels.c` (`c->sock` computes `ev` but stores `events = 0`) may deserve investigation, but this bundle does not connect it to the observed sleeping-in-poll signal.

## Git Add Paths
None

## Validation
`./configure && make` from the workspace root failed before configuration:
`configure: error: ./configure.ac newer than configure, run autoreconf`

I then tried the narrow focused build:
`make sshd-session`
It failed because configuration had not produced `config.h`:
`includes.h:19:10: fatal error: config.h: No such file or directory`

Bounded independent reproduction attempt:
`pgrep -a sshd-session` found no running `sshd-session` process in this environment, so I could not attach strace/perf to reproduce the collected poll-wait signal. The raw investigation artifact paths named in `evidence.json` were also not present under `/var/lib/fixer/investigations`. I checked `/usr/lib/openssh/sshd-session -h`; it printed usage for the installed binary but did not reproduce a runaway condition.

`git diff -- .` showed no source changes.

## Review Pass 1

RESULT: ok

The first pass correctly leaves no source diff. That matches the evidence level: the bundle shows an `sshd-session` sleeping in `poll` with low sampled CPU, not a locally reproduced userspace loop.

The response includes required `## Evidence Confidence` with `inferred`, does not overclaim reproduction, and avoids a security-sensitive timing/event-loop source change. It also reports the required project-level validation attempt, the exact `./configure && make` blocker, the focused `make sshd-session` blocker, and a bounded reproduction attempt that could not run because no `sshd-session` process or raw artifacts were available.

Workspace review found no tracked source changes (`git diff` empty), so there are no code correctness or upstreamability issues to flag.

## Plan Pass

## Problem
Fixer flagged `/usr/lib/openssh/sshd-session` as a runaway CPU candidate, but the bundle is internally weak for an OpenSSH source bug: sampled CPU was only `0.2%`, process state was sleeping, `wchan` was `poll_schedule_timeout.constprop.0`, and strace captured only `restart_syscall(<... resuming interrupted poll ...>)`. The visible stack maps to the normal `serverloop.c` `ppoll()` wait path, not a confirmed busy loop.

## Evidence Confidence
inferred

## Proposed Subject
No source patch yet: report/diagnose suspected false-positive or insufficient evidence for `sshd-session` runaway CPU.

## Patch Plan
Do not edit OpenSSH in this pass. The evidence does not demonstrate a reproducible userspace loop, and this area is security-sensitive because it touches server session event-loop timing.

If later evidence shows real poll spinning, investigate `serverloop.c::wait_until_can_do_something()` and `channels.c::{channel_prepare_poll,channel_after_poll}` first. Follow existing OpenSSH conventions: `ptimeout_*` for poll deadlines, `monotime()`/`monotime_ts()` for clocks, `fatal_f`/`debug*`/`logit` for diagnostics, and `xrecallocarray` for pollfd allocation. Avoid awkward control flow such as avoidable `goto`; nearby code has bounded helpers and direct returns for this path.

No prior Fixer patch was found in the workspace to improve or replace. I did notice a suspicious local channel poll detail in `channels.c` where the `sock` branch computes `ev` but assigns `pfd[p].events = 0`; that deserves separate investigation only if tied to fresh evidence, because the current bundle shows sleeping in poll rather than confirmed missed readiness or spin.

## Risks
A speculative event-loop patch could alter SSH session liveness, keepalive, rekey, child reap, or channel readiness behavior without a proven failure. That could create regressions in authentication/session handling or timing-sensitive server behavior.

## Validation
Before any future patch, try the project entrypoint from the workspace root:

```sh
./configure && make
```

If that fails due to missing dependencies or generated files, record the exact failure, then run the narrowest reproducible build such as:

```sh
make sshd-session
```

Bounded independent reproduction attempt: after building, run a local test `sshd`/`ssh` session under `timeout` and `strace -c` or `perf stat` to verify wh

[truncated]

Issue page: /issues/019e5698-9ba7-7bd2-9829-6d45dcb3dda4. Issue JSON: /v1/issues/019e5698-9ba7-7bd2-9829-6d45dcb3dda4

sshd-session is stuck in a likely unclassified userspace loop: 10.84% of sampled CPU passed through rtnl_dump_all, with repeated thread backtraces show 1 thread(s) around 0x00007efcc509a7d2 in ?? () from target:<path>.

## 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): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `openssh` 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.

Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `openssh` 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 `openssh` 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): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, 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 `sshd-session: gis [priv]` as a runaway CPU investigation, but the bundle’s concrete samples show the process in `S (sleeping)`, blocked in `poll_schedule_timeout`/`restart_syscall`, with only `0.1%` total CPU across 3 `sshd-session` processes. The hottest symbols are kernel rtnetlink/allocation/spinlock paths, while the OpenSSH backtrace is stripped and only reaches `poll()`. This does not identify an OpenSSH userspace loop.

## Evidence Confidence
observed

## Proposed Subject
No source patch: diagnose `sshd-session` profiler signal as non-actionable without richer reproduction

## Patch Plan
Do not edit OpenSSH in this pass. The implicated area is security-sensitive because `sshd-session` handles authentication/PAM/session privilege separation, and the evidence does not reproduce a faulty behavior or isolate a safe code change.

The likely OpenSSH code path is the normal server/session event loop in `serverloop.c`, which uses `ppoll()` with existing local timeout helpers `ptimeout_init`, `ptimeout_deadline_*`, and `ptimeout_get_tsp`. PAM-adjacent initialization in `auth-pam.c` uses established helpers such as `xstrdup`, `xasprintf`, `get_local_ipaddr`, and `auth_get_canonical_hostname`; no relevant local helper was found that would turn the kernel `rtnl_dump_all` sample into an OpenSSH fix.

There is no prior Fixer patch in the workspace to improve or replace. A source patch would be speculative, and I would reject awkward control-flow mitigations such as adding arbitrary sleeps, `goto` exits, or poll throttling because the observed process is already sleeping in `poll`.

## Risks
A speculative change in `sshd-session`, PAM setup, privilege separation, keepalive timing, or poll timeout handling could affect authentication availability, session cleanup, or timing behavior without addressing the observed kernel-side profiler signal.

The missing raw artifacts referenced by `evidence.json` prevent symbolizing the stripped OpenSSH frames or correlating file descriptors with a specific channel/session state.

## Validation
Before reporting final diagnosis, try the project-level entrypoint from the workspace root:

```sh
./configure && make
```

If that fails because Debian source build dependencies or generated files are missing, record the exact command and failure reason, then run the narrowest reproducible compile check for the inspected files, such as the generated `make serverloop.o auth-pam.o sshd-session.o` target if available after configure.

For a bounded independent reproduction attempt, run a local smoke check that does not authenticate users: invoke the built `sshd-session` directly and confirm it exits with the expected “should not be executed directly” fatal path rather than looping. Do not claim the Fixer runaway signal is reproduced unless a safe test actually shows sustained CPU or repeated nonblocking loop behavior.

## Patch Pass

Subject: no patch: diagnose sshd-session poll sample as non-actionable

## Commit Message
No source change is included.

The likely root cause from the collected perf, strace, and `/proc` evidence is not an OpenSSH userspace runaway loop. The sampled `sshd-session` process was sleeping in `poll_schedule_timeout`, strace saw only `restart_syscall(<... resuming interrupted poll ...>)`, and the process group showed only `0.1%` total CPU. The hot perf symbols are kernel rtnetlink/allocation/spinlock paths, not symbolized OpenSSH frames.

I followed the saved plan and did not change course. This area is security-sensitive because it is `sshd-session` privilege-separation/session/PAM code, so a source change would require reproduced evidence and security-impact analysis.

## Evidence Confidence
inferred

## Issue Connection
The collected signal is a Fixer profiler report for `sshd-session: gis [priv]` with hot kernel symbols including `rtnl_dump_all`, but the same bundle shows the process in `S (sleeping)`, blocked in `poll`, with only one strace line over five seconds. That is indirect profiler evidence, not a reproduced OpenSSH failure.

The cautious code-level inference is that the process was in the normal OpenSSH server/session event loop. `serverloop.c` intentionally sleeps in `ppoll()` via the local `ptimeout_init`, `ptimeout_deadline_*`, and `ptimeout_get_tsp` helpers. PAM-adjacent code follows existing OpenSSH helpers such as `xstrdup`, `xasprintf`, `logit`, and `fatal`, but no relevant local helper or wrapper was found that would turn the kernel rtnetlink sample into a safe OpenSSH source fix.

No code change was made. The expected effect is that this proposal remains an upstreamable diagnosis/report instead of a speculative authentication/session timing patch based on profiler-only evidence.

The raw artifact paths named by `evidence.json` were not present in this workspace, so I could not inspect fd targets or full backtraces beyond the bundle excerpt.

## Git Add Paths
None

## Validation
Tried the project-level entrypoint from the workspace root:

```sh
./configure && make
```

It failed before build with:

```text
configure: error: ./configure.ac newer than configure, run autoreconf
```

Focused fallback compile attempt:

```sh
make serverloop.o
```

It failed because configure had not generated `config.h`:

```text
includes.h:19:10: fatal error: config.h: No such file or directory
```

Bounded independent reproduction/smoke attempt:

```sh
timeout 3s /usr/lib/openssh/sshd-session
```

Result:

```text
sshd-session should not be executed directly
exit=255
```

This did not reproduce a runaway CPU loop. `git status --short` is clean.

## Review Pass 1

RESULT: ok

The first patch pass correctly leaves no source diff. The evidence is profiler/strace-derived and internally points to a sleeping `poll()` state rather than a reproduced OpenSSH userspace loop, so the `inferred` confidence and no-patch diagnosis are appropriate.

Validation is acceptable for a no-patch report: it attempted `./configure && make`, recorded the exact generated-file blocker, attempted a focused compile, and included a bounded smoke command that did not reproduce runaway CPU. The report also names relevant OpenSSH helper conventions (`ptimeout_*`, `xstrdup`, `xasprintf`, logging helpers) and does not claim a confirmed upstream bug or invent a reproducer.

`git status --short` and `git diff` are clean, so there are no changed paths to reject.

## Plan Pass

## Problem
Fixer flagged `sshd-session: gis [priv]` as a runaway CPU investigation, but the bundle’s concrete samples show the process in `S (sleeping)`, blocked in `poll_schedule_timeout`/`restart_syscall`, with only `0.1%` total CPU across 3 `sshd-session` processes. The hottest symbols are kernel rtnetlink/allocation/spinlock paths, while the OpenSSH backtrace is stripped and only reaches `poll()`. This does not identify an OpenSSH userspace loop.

## Evidence Confidence
observed

## Proposed Subject
No source patch: diagnose `sshd-session` profiler signal as non-actionable without richer reproduction

## Patch Plan
Do not edit OpenSSH in this pass. The implicated area is security-sensitive because `sshd-session` handles authentication/PAM/session privilege separation, and the evidence does not reproduce a faulty behavior or isolate a safe code change.

The likely OpenSSH code path is the normal server/session event loop in `serverloop.c`, which uses `ppoll()` with existing local timeout helpers `ptimeout_init`, `ptimeout_deadline_*`, and `ptimeout_get_tsp`. PAM-adjacent initialization in `auth-pam.c` uses established helpers such as `xstrdup`, `xasprintf`, `get_local_ipaddr`, and `auth_get_canonical_hostname`; no relevant local helper was found that would turn the kernel `rtnl_dump_all` sample into an OpenSSH fix.

There is no prior Fixer patch in the workspace to improve or replace. A source patch would be speculative, and I would reject awkward control-flow mitigations such as adding arbitrary sleeps, `goto` exits, or poll throttling because the observed process is already sleeping in `poll`.

## Risks
A speculative change in `sshd-session`, PAM setup, privilege separation, keepalive timing, or poll timeout handling could affect authentication availability, session cleanup, or timing behavior without addressing the observed kernel-side profiler signal.

The missing raw artifacts referenced by `evidence.json` prevent symbolizing the stripped OpenSSH frames or correlating file descriptors with a specific channel/session state.

## Validation
Before reporting final diagnosis, try the project-level entrypoint from the workspace root:

```sh
./configure && make
```

If that fails because Debian source build dependencies or generated files are missing, record the exact command and failure reason, then run the narrowest reproducible compile ch

[truncated]

Issue page: /issues/019e54cd-8f0a-70f3-b095-e1510a1d8859. Issue JSON: /v1/issues/019e54cd-8f0a-70f3-b095-e1510a1d8859

sshd-auth is stuck in a likely busy poll loop: 100.00% of sampled CPU passed through unix_stream_read_generic, with repeated read x3, write x2, clock_nanosleep x1.

## 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): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `openssh` 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.

Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `openssh` 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 `openssh` 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): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, 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 `sshd-auth` as a likely busy poll loop, but the bundle shows an indirect/profiler-only signal: the process was in `S (sleeping)`, total CPU was only `0.2%`, the sampled kernel stack was a blocking Unix socket read, and the strace shows one invalid-user auth path delaying via `clock_nanosleep`, writing a failure, seeing `POLLERR|POLLHUP`, then exiting after `ECONNRESET`.

## Evidence Confidence

inferred

This is not enough for a security-sensitive auth/timing source patch. The relevant code is authentication and throttling behavior (`auth2.c` failure delay, monitor IPC, invalid-user handling), so a patch is blocked unless validation can reproduce a real busy loop and analyze security impact.

## Proposed Subject

No source patch: diagnose `sshd-auth` profiler sample as an auth-delay/connection-reset trace unless a bounded reproduction demonstrates actual runaway CPU.

## Patch Plan

Do not edit files in this pass. If future evidence proves a bug, keep the patch upstream-style and scoped to the relevant OpenSSH subsystem, using local helpers/conventions such as `atomicio()`, `sshbuf`, `mm_request_send()/mm_request_receive()`, `fatal_f()/debug*_f()`, and the existing monitor/auth control flow.

The current evidence maps to existing behavior: `auth2.c` intentionally sleeps in `ensure_minimum_time_since()` after failed non-`none` auth, while monitor IPC uses blocking `poll()`/`atomicio()` and packet code uses `ppoll()`. I found no prior Fixer patch to improve or replace. Debian quilt patches exist, but none appear to be a Fixer workaround for this issue. I also would not add awkward control flow such as an avoidable `goto`; any future patch should use a bounded local condition or helper consistent with nearby code.

## Risks

Changing this path without reproduction could weaken authentication timing behavior, alter invalid-user handling, or create a side channel. The evidence may be a false positive from sampling a short-lived pre-auth child during normal blocking IO and intentional delay.

## Validation

First try the project-level entrypoint from the workspace root: `./configure && make`. If it fails, record the exact failing command and dependency/generated-file reason before any focused compile.

Bounded independent check before any future patch: run a local throwaway `sshd` on localhost with a temporary config and host key, drive one invalid-user `ssh` attempt under `timeout`, and collect `strace -f -ttT -e trace=read,write,poll,ppoll,nanosleep,clock_nanosleep`. Treat the issue as reproducible only if that shows repeated immediate poll/read wakeups with sustained CPU, not merely the expected auth failure delay plus disconnect.

## Patch Pass

Subject: diagnose sshd-auth busy-poll evidence as inconclusive

## Commit Message
No source change is proposed. The collected `sshd-auth` trace looks more like a short-lived pre-authentication child sleeping in OpenSSH’s deliberate authentication failure delay, then handling a peer reset, than a confirmed busy poll loop. Because this path covers authentication timing and throttling behavior, changing it without a local reproduction would be security-sensitive and not upstream-ready.

## Evidence Confidence
inferred

## Issue Connection
Fixer collected a profiler/strace signal for `sshd-auth`: `clock_nanosleep`, `write`, `ppoll`, a blocking kernel stack in `unix_stream_read_generic`, process state `S (sleeping)`, and only `0.2%` total CPU. The strace excerpt shows one delayed invalid-user authentication failure followed by `POLLERR|POLLHUP`, `ECONNRESET`, logging, and process exit.

The cautious code-level inference is that this maps to existing authentication behavior: `auth2.c` uses `ensure_minimum_time_since()`/`user_specific_delay()` to delay failed authentication attempts, monitor IPC uses `sshbuf`, `atomicio()`, and `mm_request_*()`, and packet reads wait through `ppoll()`. I found no stronger evidence of a tight userspace loop.

I made no source change, following the saved plan. A source patch here would touch authentication timing/throttling behavior, so it needs reproduced evidence plus security-impact analysis first. The expected effect is to avoid landing a speculative upstream patch for a likely false-positive busy-loop classification.

## Git Add Paths
None

## Validation
Checked contribution/style docs: only `README.md` matched the requested doc names. It documents the upstream build flow. Nearby subsystem helpers/conventions inspected: `sshbuf`, `atomicio()`, `mm_request_send()`/`mm_request_receive()`, blocking `poll()`/`ppoll()`, and `fatal_f()`/`debug*_f()` logging.

Project-level entrypoint attempted from workspace root:
`./configure && make`
Result: failed at configure with `configure: error: ./configure.ac newer than configure, run autoreconf`.

Focused fallback attempted:
`make sshd-auth`
Result: failed because generated configuration is unavailable: `includes.h:19:10: fatal error: config.h: No such file or directory`.

Additional focused syntax check attempted:
`cc -fsyntax-only -I. -Iopenbsd-compat auth2.c`
Result: same generated-file blocker: `config.h: No such file or directory`.

Bounded independent reproduction attempted with a throwaway localhost `sshd` under `strace` and one invalid-user `ssh` attempt. It was blocked by sandbox policy before reaching OpenSSH behavior: `ssh` reported `socket: Operation not permitted`, and `strace` reported `PTRACE_TRACEME: Operation not permitted` / `PTRACE_SEIZE ... Operation not permitted`. No local reproduction of the busy-poll signal was obtained.

## Review Pass 1

RESULT: ok

No blocking findings. The first pass correctly leaves no source diff for an inferred, security-sensitive authentication/timing signal. It does not overclaim reproduction, lists `## Evidence Confidence` as `inferred`, and keeps `## Git Add Paths` as `None`.

Validation is acceptable for a no-patch diagnosis: it attempted `./configure && make`, reported the exact configure blocker, tried focused fallback checks, and documented the sandbox blockers for the bounded independent reproduction attempt. The maintainer-facing explanation connects the observed perf/strace evidence to the relevant OpenSSH auth delay and monitor/packet IO paths without inventing a confirmed bug.

## Plan Pass

## Problem

Fixer flagged `sshd-auth` as a likely busy poll loop, but the bundle shows an indirect/profiler-only signal: the process was in `S (sleeping)`, total CPU was only `0.2%`, the sampled kernel stack was a blocking Unix socket read, and the strace shows one invalid-user auth path delaying via `clock_nanosleep`, writing a failure, seeing `POLLERR|POLLHUP`, then exiting after `ECONNRESET`.

## Evidence Confidence

inferred

This is not enough for a security-sensitive auth/timing source patch. The relevant code is authentication and throttling behavior (`auth2.c` failure delay, monitor IPC, invalid-user handling), so a patch is blocked unless validation can reproduce a real busy loop and analyze security impact.

## Proposed Subject

No source patch: diagnose `sshd-auth` profiler sample as an auth-delay/connection-reset trace unless a bounded reproduction demonstrates actual runaway CPU.

## Patch Plan

Do not edit files in this pass. If future evidence proves a bug, keep the patch upstream-style and scoped to the relevant OpenSSH subsystem, using local helpers/conventions such as `atomicio()`, `sshbuf`, `mm_request_send()/mm_request_receive()`, `fatal_f()/debug*_f()`, and the existing monitor/auth control flow.

The current evidence maps to existing behavior: `auth2.c` intentionally sleeps in `ensure_minimum_time_since()` after failed non-`none` auth, while monitor IPC uses blocking `poll()`/`atomicio()` and packet code uses `ppoll()`. I found no prior Fixer patch to improve or replace. Debian quilt patches exist, but none appear to be a Fixer workaround for this issue. I also would not add awkward control flow such as an avoidable `goto`; any future patch should use a bounded local condition or helper consistent with nearby code.

## Risks

Changing this path without reproduction could weaken authentication timing behavior, alter invalid-user handling, or create a side channel. The evidence may be a false positive from sampling a short-lived pre-auth child during normal blocking IO and intentional delay.

## Validation

First try the project-level entrypoint from the workspace root: `./configure && make`. If it fails, record the exact failing command and dependency/generated-file reason before any focused compile.

Bounded independent check before any future patch: run a local throwaway `sshd` on localhost with a temporary config and hos

[truncated]

Issue page: /issues/019e5500-ac1e-7af0-8b5a-cb6338503f7e. Issue JSON: /v1/issues/019e5500-ac1e-7af0-8b5a-cb6338503f7e

sshd-auth is stuck in a likely busy poll loop: 100.00% of sampled CPU passed through EVP_MD_fetch, with repeated read x3, write x2, clock_nanosleep x1.

## 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): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `openssh` 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.

Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `openssh` 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 `openssh` 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): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, 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/lib/openssh/sshd-auth` as a runaway/busy-poll process, with profiler samples in OpenSSL `EVP_MD_fetch` and a short strace showing `read`, `clock_nanosleep`, `write`, `ppoll`, then `ECONNRESET` and exit. Source inspection connects the digest sample to `auth2.c:user_specific_delay()`, which uses OpenSSH’s `ssh_digest_memory(SSH_DIGEST_SHA512, ...)` before `ensure_minimum_time_since()` applies the intentional authentication failure delay.

## Evidence Confidence
observed

## Proposed Subject
No source patch: diagnose likely false-positive busy-loop classification in sshd-auth authentication failure throttling.

## Patch Plan
Do not edit code in this pass. The evidence touches authentication timing/throttling behavior, so it is security-sensitive. The current bundle does not reproduce a defect: CPU was only 0.4%, process state was sleeping, strace had one `ppoll` and an intentional `clock_nanosleep`, then the process exited after peer reset.

Document the maintainer-facing explanation: the observed `EVP_MD_fetch` is plausibly from the existing `ssh_digest_memory()` wrapper in `user_specific_delay()`, and the sleep is deliberate minimum-failure-delay logic, not evidence of a busy poll loop. Follow OpenBSD style guidance from `README`; no relevant file/process helper is needed for a no-patch report. Relevant local conventions/helpers identified: `ssh_digest_memory()`, `xmalloc()`, `freezero()`, `monotime_double()`, `fatal_f()`, and the auth failure delay helper in `auth2.c`.

No prior Fixer source patch is present beyond the baseline snapshot, so there is nothing to improve or replace. Avoid proposing awkward control-flow changes such as new `goto` paths; absent reproduction, no bounded source change is justified.

## Risks
Changing this area without reproduction could alter authentication timing behavior and create user-enumeration or throttling regressions. Optimizing away the digest or delay based only on profiler evidence would be speculative and security-sensitive.

## Validation
Before any future patch, try the project entrypoint from the workspace root: `./configure && make`. If that fails due to missing dependencies or generated files, record the exact failure and then run the narrowest relevant reproducible build, likely `make sshd-auth` after successful configuration.

For independent reproduction, run a local debug `sshd` on a high port with a failed password/publickey auth attempt and capture `strace -ttT -f` or `perf` around `sshd-auth`. A patch should only proceed if that shows repeated nonblocking `ppoll` wakeups or sustained excessive CPU, not merely the expected `ssh_digest_memory()` plus `nanosleep()` failure delay.

## Patch Pass

Subject: No patch: diagnose sshd-auth auth delay trace

## Commit Message
No source change is proposed. The collected perf, strace, and `/proc` evidence is consistent with normal authentication failure throttling in `sshd-auth`: OpenSSH hashes a timing secret and username with `ssh_digest_memory()` to choose a small per-user delay, then sleeps before sending the failure reply. That path can explain the `EVP_MD_fetch` sample and `clock_nanosleep` trace without proving a busy loop.

This follows the saved plan. The touched area would be authentication timing/throttling, so changing it without reproduced evidence would risk weakening a security-sensitive behavior.

## Evidence Confidence
observed

## Issue Connection
Fixer observed `/usr/lib/openssh/sshd-auth` with a perf hot symbol of `EVP_MD_fetch`, process state `S (sleeping)`, total CPU around 0.4%, and a short strace containing one `clock_nanosleep`, one `ppoll`, an `ECONNRESET`, and process exit. This was observed by Fixer and not independently reproduced.

The cautious code-level inference is that `EVP_MD_fetch` comes from `auth2.c:user_specific_delay()`, which uses OpenSSH’s local digest wrapper `ssh_digest_memory(SSH_DIGEST_SHA512, ...)` to compute a per-user authentication failure delay, while `ensure_minimum_time_since()` performs the observed sleep. The trace does not show repeated nonblocking `ppoll` wakeups or sustained CPU consumption.

I made no source change. Project docs in `README` point contributors at OpenBSD style, and nearby local helpers include `ssh_digest_memory()`, `xmalloc()`, `freezero()`, `monotime_double()`, and `fatal_f()`. No relevant local helper was missing; the issue is insufficient evidence for a security-sensitive patch.

The expected effect is no behavior change: this should be handled as a no-patch upstream diagnosis unless a local reproduction shows sustained CPU use or repeated poll wakeups in `sshd-auth`.

## Git Add Paths
None

## Validation
Tried the required workspace-root entrypoint:

`./configure && make`

It failed immediately with:

`configure: error: ./configure.ac newer than configure, run autoreconf`

Then tried the narrow focused build:

`make sshd-auth`

It failed because configuration had not produced `config.h`:

`includes.h:19:10: fatal error: config.h: No such file or directory`

I also attempted a bounded independent smoke reproduction by starting the installed `/usr/sbin/sshd` under `strace` with temporary keys and forcing a failed public-key login to localhost. The sandbox blocked it: `strace` failed with `PTRACE_TRACEME: Operation not permitted`, and the SSH client failed with `socket: Operation not permitted`. No local reproduction was obtained.

## Review Pass 1

RESULT: ok

No source diff is present, which is appropriate for this evidence level and security-sensitive authentication timing path. The author response includes the required sections, uses a valid `observed` confidence classification, explicitly says the Fixer signal was not independently reproduced, and does not claim a confirmed upstream bug.

Validation is acceptable for a no-patch diagnosis: `./configure && make` was attempted and the exact blocker was reported, followed by a focused `make sshd-auth` attempt and an independent smoke reproduction attempt that was blocked by sandbox ptrace/socket restrictions. The explanation connects the collected `EVP_MD_fetch`, `clock_nanosleep`, low CPU, sleeping state, and single `ppoll`/exit trace to the existing `auth2.c` failure-delay path without overclaiming.

## Plan Pass

## Problem
Fixer flagged `/usr/lib/openssh/sshd-auth` as a runaway/busy-poll process, with profiler samples in OpenSSL `EVP_MD_fetch` and a short strace showing `read`, `clock_nanosleep`, `write`, `ppoll`, then `ECONNRESET` and exit. Source inspection connects the digest sample to `auth2.c:user_specific_delay()`, which uses OpenSSH’s `ssh_digest_memory(SSH_DIGEST_SHA512, ...)` before `ensure_minimum_time_since()` applies the intentional authentication failure delay.

## Evidence Confidence
observed

## Proposed Subject
No source patch: diagnose likely false-positive busy-loop classification in sshd-auth authentication failure throttling.

## Patch Plan
Do not edit code in this pass. The evidence touches authentication timing/throttling behavior, so it is security-sensitive. The current bundle does not reproduce a defect: CPU was only 0.4%, process state was sleeping, strace had one `ppoll` and an intentional `clock_nanosleep`, then the process exited after peer reset.

Document the maintainer-facing explanation: the observed `EVP_MD_fetch` is plausibly from the existing `ssh_digest_memory()` wrapper in `user_specific_delay()`, and the sleep is deliberate minimum-failure-delay logic, not evidence of a busy poll loop. Follow OpenBSD style guidance from `README`; no relevant file/process helper is needed for a no-patch report. Relevant local conventions/helpers identified: `ssh_digest_memory()`, `xmalloc()`, `freezero()`, `monotime_double()`, `fatal_f()`, and the auth failure delay helper in `auth2.c`.

No prior Fixer source patch is present beyond the baseline snapshot, so there is nothing to improve or replace. Avoid proposing awkward control-flow changes such as new `goto` paths; absent reproduction, no bounded source change is justified.

## Risks
Changing this area without reproduction could alter authentication timing behavior and create user-enumeration or throttling regressions. Optimizing away the digest or delay based only on profiler evidence would be speculative and security-sensitive.

## Validation
Before any future patch, try the project entrypoint from the workspace root: `./configure && make`. If that fails due to missing dependencies or generated files, record the exact failure and then run the narrowest relevant reproducible build, likely `make sshd-auth` after successful configuration.

For independent reproduction, run a loc

[truncated]

Issue page: /issues/019e5687-8584-7803-a795-4e7de52d1c60. Issue JSON: /v1/issues/019e5687-8584-7803-a795-4e7de52d1c60

sshd-session is stuck in a likely unclassified userspace loop: 8.61% of sampled CPU passed through mas_store_gfp, with repeated thread backtraces show 1 thread(s) around 0x00007eff0e09a7d2 in ?? () from target:<path>.

## 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): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `openssh` 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.

Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `openssh` 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 `openssh` 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): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, 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’s evidence points at `sshd-session` around `poll`/`ppoll`, but the collected process was sleeping in `poll_schedule_timeout`, `strace` saw only `restart_syscall`, and the sampled target showed only `0.1%` total CPU. The hot symbols are mostly kernel memory-management paths, not a symbolized OpenSSH loop. Raw artifact paths referenced in `evidence.json` were not present for deeper inspection.

## Evidence Confidence
inferred

## Proposed Subject
No source patch yet: diagnose `sshd-session` poll evidence before changing OpenSSH session-loop behavior.

## Patch Plan
Do not edit source in this pass. The likely touched area would be `serverloop.c`/`session.c`, which is security-sensitive session and timing behavior, and the current evidence does not reproduce a user-visible bug or identify a bad OpenSSH control path.

Before any future patch, collect stronger evidence: symbolized backtraces from a locally built `sshd-session`, a bounded repro showing sustained CPU, and event-loop state around `server_loop2()`, `wait_until_can_do_something()`, `channel_prepare_poll()`, and `channel_after_poll()`.

Follow upstream conventions found locally: `README.md`/`regress/README.regress`, OpenSSH logging via `debug*()`, `logit()`, `fatal_*()`, allocation via `xmalloc`/`xrecallocarray`, signal handling via `ssh_signal()`, and timeout handling via `ptimeout_*` plus `monotime()`. No relevant prior Fixer patch was found; Debian carries subsystem patches such as `gssapi.patch`, but nothing that should be replaced from Fixer evidence. If a future patch is justified, keep it bounded and avoid awkward new `goto` flow where a direct conditional or helper is clearer.

## Risks
Changing the session event loop without reproduction could alter authentication/session lifecycle, keepalive timing, child reaping, forwarding, or disconnect behavior. A speculative timeout or polling change could create regressions or mask a kernel/libc/PAM/systemd interaction instead of fixing OpenSSH.

## Validation
First try the project-level entrypoint from the workspace root: `./configure && make`. If dependencies or generated files are missing, record the exact failing command and error.

If stronger evidence justifies a patch, run the narrowest relevant checks after the project build: `make regress-unit-binaries && make unit` for `ptimeout`/misc coverage, plus a focused server regression such as `make t-exec LTESTS=connection-timeout` or another session-loop test matching the confirmed failure. A bounded independent reproduction attempt should run a local regression `sshd-session` under `timeout` with `strace`/`ps` sampling to prove sustained CPU before claiming `reproduced`; otherwise final reporting must state the failure was not independently reproduced.

## Patch Pass

Subject: Diagnose sshd-session poll profile without source change

## Commit Message
No source change is proposed. The collected profile points at a sleeping `sshd-session` in `poll`/`ppoll`, with only one `restart_syscall` in 5 seconds and `/proc` state `S (sleeping)`. That is consistent with an idle server session event loop, not enough evidence for changing OpenSSH session timing or authentication-adjacent code.

## Evidence Confidence
inferred

## Issue Connection
Fixer collected a profiler signal for `/usr/lib/openssh/sshd-session` with kernel hot symbols, a backtrace through `poll()`, `wchan` at `poll_schedule_timeout`, and a single `restart_syscall` line from `strace`. The same evidence reports only `0.1%` total CPU for the sampled `sshd-session` processes.

The cautious inference is that the observed process was blocked in OpenSSH’s server session event loop, not proven to be spinning in userspace. The relevant code in `serverloop.c` already uses OpenSSH’s local `ptimeout_*` helpers, `monotime()`, `channel_prepare_poll()`, `channel_after_poll()`, `ssh_signal()`, and `debug*()`/`logit()` conventions. Changing this area would affect session lifecycle and timing/throttling behavior, so it needs reproduced evidence and security-impact analysis first.

I followed the saved plan and left no source diff. The expected effect is to avoid an unsupported upstream patch while preserving a clear report: stronger evidence should include a symbolized backtrace from a locally built `sshd-session` plus a bounded reproduction showing sustained CPU or repeated wakeups.

## Git Add Paths
None

## Validation
Project entrypoint attempted from workspace root: `./configure && make`

It failed before build with: `configure: error: ./configure.ac newer than configure, run autoreconf`

Focused compile attempt: `cc -fsyntax-only -I. -Iopenbsd-compat serverloop.c`

It failed because configure did not generate `config.h`: `includes.h:19:10: fatal error: config.h: No such file or directory`

Independent reproduction attempts:
`pgrep -a sshd-session` found no local `sshd-session` process to sample.
`timeout 5 strace -f -tt -o /tmp/fixer-sshd-session-direct.strace /usr/lib/openssh/sshd-session` was blocked by sandbox ptrace restrictions: `Operation not permitted`.
`timeout 5 /usr/lib/openssh/sshd-session` exited normally for direct invocation with `sshd-session should not be executed directly`, `rc=255`; it did not reproduce the collected sleeping-poll/runaway signal.

## Review Pass 1

RESULT: ok

No source diff is present, which is appropriate for the indirect profiler/strace evidence and the security-sensitive `sshd-session` timing/session-loop area. The author used `inferred`, did not claim reproduction, named the relevant OpenSSH helpers/conventions, and reported the project-level build failure with the exact command and blocker before listing narrower checks and reproduction blockers.

## Plan Pass

## Problem
Fixer’s evidence points at `sshd-session` around `poll`/`ppoll`, but the collected process was sleeping in `poll_schedule_timeout`, `strace` saw only `restart_syscall`, and the sampled target showed only `0.1%` total CPU. The hot symbols are mostly kernel memory-management paths, not a symbolized OpenSSH loop. Raw artifact paths referenced in `evidence.json` were not present for deeper inspection.

## Evidence Confidence
inferred

## Proposed Subject
No source patch yet: diagnose `sshd-session` poll evidence before changing OpenSSH session-loop behavior.

## Patch Plan
Do not edit source in this pass. The likely touched area would be `serverloop.c`/`session.c`, which is security-sensitive session and timing behavior, and the current evidence does not reproduce a user-visible bug or identify a bad OpenSSH control path.

Before any future patch, collect stronger evidence: symbolized backtraces from a locally built `sshd-session`, a bounded repro showing sustained CPU, and event-loop state around `server_loop2()`, `wait_until_can_do_something()`, `channel_prepare_poll()`, and `channel_after_poll()`.

Follow upstream conventions found locally: `README.md`/`regress/README.regress`, OpenSSH logging via `debug*()`, `logit()`, `fatal_*()`, allocation via `xmalloc`/`xrecallocarray`, signal handling via `ssh_signal()`, and timeout handling via `ptimeout_*` plus `monotime()`. No relevant prior Fixer patch was found; Debian carries subsystem patches such as `gssapi.patch`, but nothing that should be replaced from Fixer evidence. If a future patch is justified, keep it bounded and avoid awkward new `goto` flow where a direct conditional or helper is clearer.

## Risks
Changing the session event loop without reproduction could alter authentication/session lifecycle, keepalive timing, child reaping, forwarding, or disconnect behavior. A speculative timeout or polling change could create regressions or mask a kernel/libc/PAM/systemd interaction instead of fixing OpenSSH.

## Validation
First try the project-level entrypoint from the workspace root: `./configure && make`. If dependencies or generated files are missing, record the exact failing command and error.

If stronger evidence justifies a patch, run the narrowest relevant checks after the project build: `make regress-unit-binaries && make unit` for `ptimeout`/misc coverage, plus a focused se

[truncated]

Issue page: /issues/019e49ca-2d38-7561-81f3-cf9c3d37cc2e. Issue JSON: /v1/issues/019e49ca-2d38-7561-81f3-cf9c3d37cc2e

sshd-session is stuck in a likely unclassified userspace loop: 24.61% of sampled CPU passed through free_unref_folios, with repeated thread backtraces show 1 thread(s) around 0x00007fab4a89a7d2 in ?? () from target:<path>.

## 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): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `openssh` 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.

Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `openssh` 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 `openssh` 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): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, 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/lib/openssh/sshd-session` as a runaway CPU candidate, but the captured artifacts point at a privileged session process sleeping in `poll`: `State: S`, `wchan: poll_schedule_timeout.constprop.0`, one `restart_syscall`, and sampled CPU only `0.2%` across three processes. The hot symbols are mostly kernel/loader/libc offsets, not an OpenSSH source frame.

## Evidence Confidence
observed

## Proposed Subject
No source patch yet: diagnose the report as insufficient for an upstream OpenSSH code change unless a bounded local reproduction shows `sshd-session` spinning or waking excessively.

## Patch Plan
Do not edit in this pass. The implicated code is security-sensitive because it is `sshd-session` privilege-separation/authenticated session handling and includes timeout/keepalive behavior.

I inspected `README.md`; no `CONTRIBUTING`, `HACKING`, `README-hacking`, `docs/`, or `dev-docs/` were present. `README.md` points to the normal portable OpenSSH `./configure`, `make`, and `make tests` flow.

Subsystem scan found the relevant session loop in `serverloop.c`: `server_loop2()` calls `wait_until_can_do_something()`, which uses `ppoll()` with OpenSSH’s local `ptimeout_*` helpers from `misc.c`, `monotime()`, `channel_prepare_poll()`, `channel_after_poll()`, and project logging/error helpers such as `fatal_f`, `fatal_fr`, `debug*`, and `logit`. No relevant missing wrapper or obvious busy-loop pattern was found. `monitor.c` also has an intentional blocking `poll(..., -1)` for monitor IPC.

No prior Fixer patch marker or local patch for this finding was found.

Because the evidence shows a sleeping `poll` wait rather than a reproducible OpenSSH loop, I would not plan an upstream source patch. If later reproduction proves a specific excessive wakeup path, any patch should be narrow, follow the existing `ptimeout_*`/`monotime()` style, and avoid awkward control flow such as avoidable `goto`.

## Risks
Changing `sshd-session` timing, keepalive, PAM, monitor, or privilege-separation behavior without reproduction could cause authentication regressions, stuck sessions, broken channel cleanup, or altered disconnect semantics.

The current evidence may reflect profiler attribution noise, kernel memory-management cost, or an external environment condition rather than an OpenSSH defect.

## Validation
Before any future focused check, try the project-level entrypoint from the workspace root:

```sh
./configure && make
```

If that fails due to dependencies or generated files, record the exact failure and then run the narrowest relevant build target, likely:

```sh
make sshd-session
```

Bounded independent reproduction attempt, if safe in the environment: build a local `sshd`/`sshd-session`, start it with a temporary config and host keys on `127.0.0.1` high port, open one local SSH session, then sample `ps`, `/proc/$pid/wchan`, and a short `strace -tt -p $pid`/CPU check for the privileged `sshd-session`. Do not claim `reproduced` unless that shows repeated wakeups or CPU use matching the Fixer signal.

## Patch Pass

Subject: sshd-session: diagnose inconclusive poll-sleep profile

## Commit Message
No source change is included. The collected evidence points to an `sshd-session` process blocked in `poll`, not to a demonstrated OpenSSH busy loop. Because this is privilege-separated session code with timing behavior, a source patch would need a reproduced failure and security-impact analysis first.

## Evidence Confidence
inferred

## Issue Connection
The likely root cause of the collected signal is profiler attribution around a sleeping process, not a confirmed userspace spin in OpenSSH. Fixer recorded `sshd-session: gis [priv]` in state `S (sleeping)`, with `wchan` at `poll_schedule_timeout.constprop.0`, one `restart_syscall` resuming `poll`, and only `0.2%` sampled CPU across three `sshd-session` processes. The hottest symbol was kernel memory-management code, `free_unref_folios`, rather than a resolved OpenSSH loop.

The relevant OpenSSH code is the session event loop, where `server_loop2()` waits in `wait_until_can_do_something()`. That code already uses OpenSSH’s local `ptimeout_*` helpers, `monotime()`, `channel_prepare_poll()`, `channel_after_poll()`, and the project logging/error conventions such as `fatal_f`, `fatal_fr`, `debug*`, and `logit`. I found no local evidence of an avoidable busy loop or missing wrapper use. `monitor.c` also has an intentional blocking `poll(..., -1)` for monitor IPC.

I followed the saved plan and did not change course: since the evidence is profiler/trace based and the implicated area is security-sensitive session/timing behavior, I did not leave a speculative source diff. The expected effect is that this proposal remains suitable as an upstream bug-report diagnosis rather than an unsafe patch.

I checked project guidance before deciding: only `README.md` matched the requested contribution/style-doc search; no `CONTRIBUTING`, `HACKING`, `README-hacking`, `docs/`, or `dev-docs/` were present.

## Git Add Paths
None

## Validation
`./configure && make` from the workspace root failed before build:
`configure: error: ./configure.ac newer than configure, run autoreconf`

`make sshd-session` from the workspace root also failed because the tree was not configured:
`includes.h:19:10: fatal error: config.h: No such file or directory`

To keep the repository clean, I copied the tree to `/tmp/openssh-build-90912.boIzGd` and ran:
`autoreconf && ./configure && make sshd-session`

That succeeded and linked `sshd-session`. `autoreconf` printed `Failed to create stream fd: Operation not permitted` warnings, but the command continued successfully.

Bounded reproduction attempt:
`pgrep -a sshd-session || true` found no live `sshd-session` process to sample. Running the built helper directly produced `sshd-session should not be executed directly`, which is expected and does not reproduce the privileged session state from the evidence. Therefore the failure was not reproduced locally.

## Review Pass 1

RESULT: ok

No source diff is present, which is appropriate for this evidence level and subsystem. The author correctly treated the `sshd-session` session/timing area as security-sensitive and avoided a speculative source patch because the failure was not reproduced.

The patch output includes the required sections, uses an allowed evidence confidence value, does not claim reproduction, and explains the collected signal cautiously: sleeping in `poll`, `restart_syscall`, low sampled CPU, and kernel hot symbols rather than a resolved OpenSSH loop.

Validation is acceptable for a no-patch diagnosis: the project-level `./configure && make` was attempted from the workspace root and the exact blocker was reported; a narrower reproducible build path was run in a temporary copy; and a bounded reproduction attempt was reported as not reproduced.

## Plan Pass

## Problem
Fixer flagged `/usr/lib/openssh/sshd-session` as a runaway CPU candidate, but the captured artifacts point at a privileged session process sleeping in `poll`: `State: S`, `wchan: poll_schedule_timeout.constprop.0`, one `restart_syscall`, and sampled CPU only `0.2%` across three processes. The hot symbols are mostly kernel/loader/libc offsets, not an OpenSSH source frame.

## Evidence Confidence
observed

## Proposed Subject
No source patch yet: diagnose the report as insufficient for an upstream OpenSSH code change unless a bounded local reproduction shows `sshd-session` spinning or waking excessively.

## Patch Plan
Do not edit in this pass. The implicated code is security-sensitive because it is `sshd-session` privilege-separation/authenticated session handling and includes timeout/keepalive behavior.

I inspected `README.md`; no `CONTRIBUTING`, `HACKING`, `README-hacking`, `docs/`, or `dev-docs/` were present. `README.md` points to the normal portable OpenSSH `./configure`, `make`, and `make tests` flow.

Subsystem scan found the relevant session loop in `serverloop.c`: `server_loop2()` calls `wait_until_can_do_something()`, which uses `ppoll()` with OpenSSH’s local `ptimeout_*` helpers from `misc.c`, `monotime()`, `channel_prepare_poll()`, `channel_after_poll()`, and project logging/error helpers such as `fatal_f`, `fatal_fr`, `debug*`, and `logit`. No relevant missing wrapper or obvious busy-loop pattern was found. `monitor.c` also has an intentional blocking `poll(..., -1)` for monitor IPC.

No prior Fixer patch marker or local patch for this finding was found.

Because the evidence shows a sleeping `poll` wait rather than a reproducible OpenSSH loop, I would not plan an upstream source patch. If later reproduction proves a specific excessive wakeup path, any patch should be narrow, follow the existing `ptimeout_*`/`monotime()` style, and avoid awkward control flow such as avoidable `goto`.

## Risks
Changing `sshd-session` timing, keepalive, PAM, monitor, or privilege-separation behavior without reproduction could cause authentication regressions, stuck sessions, broken channel cleanup, or altered disconnect semantics.

The current evidence may reflect profiler attribution noise, kernel memory-management cost, or an external environment condition rather than an OpenSSH defect.

## Validation
Before any future focused check, 

[truncated]

Issue page: /issues/019e4414-07d3-7693-a406-71d5f5c2c354. Issue JSON: /v1/issues/019e4414-07d3-7693-a406-71d5f5c2c354

sshd-auth is stuck in a likely busy poll loop: 50.00% of sampled CPU passed through syscall_return_via_sysret, with repeated read x3, write x2, clock_nanosleep x1.

## 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): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `openssh` 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.

Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `openssh` 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 `openssh` 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): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, 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 an `sshd-auth` preauth child with a short trace pattern of `read`, `clock_nanosleep`, and `write`, classified as possible busy polling. The sampled process was sleeping, had only ~0.7% total CPU across two processes, and exited after `ECONNRESET`. The `clock_nanosleep` evidence matches `auth2.c`’s intentional failed-authentication timing delay (`ensure_minimum_time_since()` using `monotime_double()` and `nanosleep()`), so this is authentication timing behavior and security-sensitive.

## Evidence Confidence
observed

## Proposed Subject
No source patch yet: diagnose `sshd-auth` failed-auth delay trace as likely intentional timing mitigation unless an independent bounded reproduction shows sustained CPU or repeated near-zero sleep/wakeup behavior.

## Patch Plan
Do not edit in this pass. First validate whether the trace is a real runaway loop or a profiler false positive around OpenSSH’s deliberate auth-failure delay.

If reproduction later proves a real issue, keep any change narrowly in `auth2.c` around `ensure_minimum_time_since()` or its caller, preserving the timing side-channel mitigation. Use existing OpenSSH conventions and helpers: `monotime_double()` for elapsed time, `fatal_f`/`fatal_fr` for fatal paths, `debug3_f` for diagnostics, `sshpkt_*` for packet handling, `atomicio()` for complete fd reads/writes where applicable, and `xmalloc`/`freezero` for allocation/secret cleanup. Avoid awkward control flow such as adding a `goto` around the bounded delay; a simple bounded conditional or helper adjustment would be preferred if evidence supports it.

I found `README.md` build/development guidance, no separate `CONTRIBUTING`/`HACKING` docs in the workspace scan, and no prior Fixer patch in `debian/patches` to improve or replace.

## Risks
Changing this area can weaken authentication timing behavior, alter MaxAuthTries/failure accounting, or create user-enumeration timing regressions. A patch is blocked unless validation can reproduce an actual CPU loop and analyze the timing/security impact.

## Validation
Before any focused check, try the project entrypoint from the workspace root: `./configure && make`.

Then run a bounded independent reproduction attempt against the built tree, for example `make tests LTESTS=password` and, if needed, repeat under `strace -f -e trace=read,write,nanosleep,clock_nanosleep -o /tmp/sshd-auth-authdelay.strace make tests LTESTS=password`. This should show whether failed authentication produces normal bounded sleeps or a sustained tight wakeup loop. If `./configure && make` fails due to missing dependencies or generated files, report the exact failure and then fall back to the narrowest reproducible compile/check for `auth2.o` plus the focused regress test.

## Patch Pass

Subject: diagnose sshd-auth auth-delay profiler signal

## Commit Message
No source change. The collected signal points at OpenSSH’s pre-authentication failure-delay path, not a locally reproduced busy loop. Because that path is authentication timing behavior, changing it without a reproduced failure would risk weakening timing-side-channel protections.

## Evidence Confidence
inferred

## Issue Connection
Fixer collected profiler, strace, and `/proc` evidence for `sshd-auth`: a short sequence of `read`, `clock_nanosleep`, and `write`, with the process in sleeping state, low sampled CPU, and eventual `ECONNRESET`/exit. The likely root cause is that the profiler classified OpenSSH’s deliberate failed-authentication delay as a busy-poll loop.

The relevant code is `auth2.c`: failed user-authentication attempts call `ensure_minimum_time_since()`, which computes elapsed time with the local `monotime_double()` helper and sleeps with `nanosleep()` before sending the failure packet. The trace’s `clock_nanosleep` durations, including ~32 ms and ~1.98 s sleeps, are consistent with bounded sleeping rather than a tight CPU loop.

I followed the saved plan and did not change course: no source patch was left because this is security-sensitive authentication timing behavior and I could not independently reproduce a runaway loop. A source change here would need reproduced evidence plus explicit timing/security analysis. Local conventions inspected include `README.md`, `monotime_double()`, `debug3_f`, `fatal_f`/`fatal_fr`, `xmalloc`/`freezero`, `atomicio()`, and `sshpkt_*`; no relevant additional contribution/style document was found.

The expected effect of this proposal is no code change: it leaves an upstream-ready diagnosis/report instead of a speculative authentication-timing patch.

## Git Add Paths
None

## Validation
`./configure && make` from the prepared workspace root failed immediately with:
`configure: error: ./configure.ac newer than configure, run autoreconf`

To validate buildability without dirtying the prepared workspace, I copied the tree to `/tmp/fixer-90622-validation.XGcTAQ/workspace` and ran:
`autoreconf && ./configure && make`
Result: passed.

Independent reproduction attempts:
`timeout 180 strace -f -e trace=read,write,nanosleep,clock_nanosleep,ppoll -o /tmp/sshd-auth-authdelay.strace make tests LTESTS=password`
Result: blocked by sandbox ptrace restrictions: `PTRACE_TRACEME: Operation not permitted` and `ptrace(PTRACE_SEIZE, 54): Operation not permitted`.

`timeout 180 make tests LTESTS=password`
Result: blocked before reaching the auth path: `Unsupported option UsePAM`, `Missing privilege separation directory: /var/empty`, `FATAL: sshd_proxy broken`.

A minimal localhost `sshd` smoke attempt after rebuilding in `/tmp` with `--with-privsep-path=/tmp/fixer-90622-validation.XGcTAQ/empty` was also blocked by sandbox network isolation: `socket: Operation not permitted`. Therefore the reported failure was not reproduced locally.

## Review Pass 1

RESULT: ok

No source diff is present in the prepared workspace, so there is no code patch to reject for correctness or security-sensitive authentication timing changes.

The author response uses a valid `## Evidence Confidence` value (`inferred`), avoids claiming local reproduction, and appropriately leaves a no-patch diagnosis for a profiler/strace signal in authentication timing code. It also reports the required project-level build attempt (`./configure && make`) and the exact blocker, then documents broader build validation in a temporary copy plus the blocked reproduction attempts.

The diagnosis is maintainer-readable and connects the collected signal to the relevant OpenSSH code path in `auth2.c` (`ensure_minimum_time_since()`, `monotime_double()`, `nanosleep()`), while naming the inspected project guidance and local helper conventions.

## Plan Pass

## Problem
Fixer observed an `sshd-auth` preauth child with a short trace pattern of `read`, `clock_nanosleep`, and `write`, classified as possible busy polling. The sampled process was sleeping, had only ~0.7% total CPU across two processes, and exited after `ECONNRESET`. The `clock_nanosleep` evidence matches `auth2.c`’s intentional failed-authentication timing delay (`ensure_minimum_time_since()` using `monotime_double()` and `nanosleep()`), so this is authentication timing behavior and security-sensitive.

## Evidence Confidence
observed

## Proposed Subject
No source patch yet: diagnose `sshd-auth` failed-auth delay trace as likely intentional timing mitigation unless an independent bounded reproduction shows sustained CPU or repeated near-zero sleep/wakeup behavior.

## Patch Plan
Do not edit in this pass. First validate whether the trace is a real runaway loop or a profiler false positive around OpenSSH’s deliberate auth-failure delay.

If reproduction later proves a real issue, keep any change narrowly in `auth2.c` around `ensure_minimum_time_since()` or its caller, preserving the timing side-channel mitigation. Use existing OpenSSH conventions and helpers: `monotime_double()` for elapsed time, `fatal_f`/`fatal_fr` for fatal paths, `debug3_f` for diagnostics, `sshpkt_*` for packet handling, `atomicio()` for complete fd reads/writes where applicable, and `xmalloc`/`freezero` for allocation/secret cleanup. Avoid awkward control flow such as adding a `goto` around the bounded delay; a simple bounded conditional or helper adjustment would be preferred if evidence supports it.

I found `README.md` build/development guidance, no separate `CONTRIBUTING`/`HACKING` docs in the workspace scan, and no prior Fixer patch in `debian/patches` to improve or replace.

## Risks
Changing this area can weaken authentication timing behavior, alter MaxAuthTries/failure accounting, or create user-enumeration timing regressions. A patch is blocked unless validation can reproduce an actual CPU loop and analyze the timing/security impact.

## Validation
Before any focused check, try the project entrypoint from the workspace root: `./configure && make`.

Then run a bounded independent reproduction attempt against the built tree, for example `make tests LTESTS=password` and, if needed, repeat under `strace -f -e trace=read,write,nanosleep,clock_nanosleep -o /t

[truncated]

Issue page: /issues/019e3ec4-e457-7410-8e2a-b04690dc6937. Issue JSON: /v1/issues/019e3ec4-e457-7410-8e2a-b04690dc6937

sshd-session is stuck in a likely unclassified userspace loop: 21.93% of sampled CPU passed through vma_interval_tree_remove, with repeated thread backtraces show 1 thread(s) around 0x00007fa9b889a7d2 in ?? () from target:<path>.

## 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): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `openssh` 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.

Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `openssh` 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 `openssh` 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): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, 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/lib/openssh/sshd-session` as a runaway CPU process, but the bundle does not currently identify an OpenSSH userspace bug. The sampled process was `S (sleeping)`, `wchan=poll_schedule_timeout`, `strace` showed only `restart_syscall`, and aggregate sampled CPU was `0.1%`. The hot symbols are kernel memory-management paths (`vma_interval_tree_remove`, `free_pages_and_swap_cache`, `mas_spanning_rebalance`) plus libc `__errno_location`, with no symbolized OpenSSH frame proving a tight loop.

## Evidence Confidence
inferred

## Proposed Subject
No source patch: diagnose/report insufficient and contradictory runaway-process evidence for `sshd-session`.

## Patch Plan
Do not edit OpenSSH source in this pass. `sshd-session` is security-sensitive because it spans authentication, privilege separation, PAM/GSSAPI, credentials, and post-auth session handling; a source patch is not justified without a reproduced behavior and security-impact analysis.

Relevant upstream/local context found:
- `README.md` documents normal portable OpenSSH build/test flow: `./configure`, `make`, `make tests`.
- `OVERVIEW` is present but explicitly obsolete; it still confirms server session work is in `serverloop.c`.
- No `CONTRIBUTING`, `HACKING`, `README-hacking`, `docs/`, or `dev-docs/` style guide was found.
- Local conventions/helpers to follow if later evidence supports a patch: `ppoll()` plus `ptimeout_*()` helpers, `monotime()`, `channel_prepare_poll()` / `channel_after_poll()`, `ssh_signal()`, `xcalloc()` / `xmalloc()`, and logging/fatal wrappers such as `debug()`, `error_f()`, `fatal_f()`.
- No prior Fixer source patch was present; `git status --short` was clean.

The likely maintainer-facing result should explain that the collected data shows an idle/blocking `sshd-session` around the expected `serverloop.c` poll wait, not a demonstrated OpenSSH runaway loop. If later evidence finds a real loop, prefer a small bounded state-machine/deadline fix using the existing helpers and avoid awkward control flow such as unnecessary `goto`.

## Risks
A speculative OpenSSH patch here could alter authentication/session timing or privilege-separation behavior without proving the issue. The observed kernel hot path may instead be from process teardown, memory-map churn, profiler attribution, libc/runtime behavior, PAM/NSS/systemd interaction, or a kernel issue. Patching server loop throttling without reproduction could mask real failures or introduce latency/regression in interactive SSH sessions.

## Validation
Before reporting final diagnosis, try the project-level entrypoint from the workspace root:

`./configure && make`

If that fails because dependencies or generated files are missing, record the exact command and failure reason, then run the narrowest reproducible build such as `make sshd-session` if `configure` produced a usable `Makefile`.

Bounded independent reproduction attempt: after a successful build, run a temporary loopback debug `sshd`/`ssh` smoke check with timeouts and a minimal non-PAM config, then sample any spawned `sshd-session` with `ps`/`wchan`/short `strace` to see whether it actually becomes CPU-hot. Do not claim `reproduced` unless that command shows a sustained hot `sshd-session` userspace loop.

## Patch Pass

Subject: Diagnose sshd-session poll-sleep profile without source change

## Commit Message
No source change was made. The collected evidence points to an `sshd-session` process blocked in `poll`, not to a demonstrated OpenSSH userspace busy loop. Because `sshd-session` covers authentication, privilege separation, credentials, PAM/GSSAPI, and session timing, a source patch would need a local reproduction plus security-impact analysis.

## Evidence Confidence
inferred

## Issue Connection
The collected signal says `sshd-session: gis [priv]` was investigated as a runaway process, but the `/proc`, `strace`, and stack evidence are internally cautious: the process state was `S (sleeping)`, `wchan` was `poll_schedule_timeout`, `strace` captured only a resumed `restart_syscall`, and the profile target reported only `0.1%` total CPU across three `sshd-session` processes. The hottest samples were kernel virtual-memory paths such as `vma_interval_tree_remove`, not symbolized OpenSSH frames.

The likely root cause is an attribution or evidence-quality mismatch rather than a confirmed OpenSSH loop: the only symbolized user-visible wait path is the normal server poll wait. In the relevant code, `serverloop.c` already uses OpenSSH’s local polling conventions: `ppoll()`, `ptimeout_*()` deadline helpers, `monotime()`, `channel_prepare_poll()`, `channel_after_poll()`, `ssh_signal()`, and logging/allocation wrappers such as `fatal_f()` and `xcalloc()`.

I followed the saved plan and left no source diff. A speculative change to server-loop timing or session handling would be security-sensitive and not pull-request-ready from this evidence. The expected effect of this proposal is to give upstream a clear no-patch diagnosis: collect a symbolized, reproducible hot userspace stack before changing OpenSSH.

## Git Add Paths
None

## Validation
Checked contribution/style guidance from the workspace root. Only `README.md` matched the requested contribution/style-doc search set; no `CONTRIBUTING`, `HACKING`, `README-hacking`, `docs/`, or `dev-docs/` path was found.

Tried the project-level entrypoint:

`./configure && make`

It failed before configuration with:

`configure: error: ./configure.ac newer than configure, run autoreconf`

Tried the narrow focused build:

`make sshd-session`

It failed because configuration had not produced `config.h`:

`includes.h:19:10: fatal error: config.h: No such file or directory`

Bounded independent reproduction attempt: `pgrep -ax sshd-session` found no live `sshd-session` process to sample, and the raw artifact directory referenced by `evidence.json` was not present in this workspace (`raw artifact directory missing`). I did not reproduce the reported runaway signal locally.

## Review Pass 1

RESULT: ok

No source diff is present, and the no-patch diagnosis matches the indirect evidence level. The response uses `inferred`, does not claim reproduction, reports the project-level build failure with the exact blocker, includes a narrower compile attempt, and avoids a security-sensitive `sshd-session` source change without reproduced behavior and impact analysis.

## Plan Pass

## Problem
Fixer flagged `/usr/lib/openssh/sshd-session` as a runaway CPU process, but the bundle does not currently identify an OpenSSH userspace bug. The sampled process was `S (sleeping)`, `wchan=poll_schedule_timeout`, `strace` showed only `restart_syscall`, and aggregate sampled CPU was `0.1%`. The hot symbols are kernel memory-management paths (`vma_interval_tree_remove`, `free_pages_and_swap_cache`, `mas_spanning_rebalance`) plus libc `__errno_location`, with no symbolized OpenSSH frame proving a tight loop.

## Evidence Confidence
inferred

## Proposed Subject
No source patch: diagnose/report insufficient and contradictory runaway-process evidence for `sshd-session`.

## Patch Plan
Do not edit OpenSSH source in this pass. `sshd-session` is security-sensitive because it spans authentication, privilege separation, PAM/GSSAPI, credentials, and post-auth session handling; a source patch is not justified without a reproduced behavior and security-impact analysis.

Relevant upstream/local context found:
- `README.md` documents normal portable OpenSSH build/test flow: `./configure`, `make`, `make tests`.
- `OVERVIEW` is present but explicitly obsolete; it still confirms server session work is in `serverloop.c`.
- No `CONTRIBUTING`, `HACKING`, `README-hacking`, `docs/`, or `dev-docs/` style guide was found.
- Local conventions/helpers to follow if later evidence supports a patch: `ppoll()` plus `ptimeout_*()` helpers, `monotime()`, `channel_prepare_poll()` / `channel_after_poll()`, `ssh_signal()`, `xcalloc()` / `xmalloc()`, and logging/fatal wrappers such as `debug()`, `error_f()`, `fatal_f()`.
- No prior Fixer source patch was present; `git status --short` was clean.

The likely maintainer-facing result should explain that the collected data shows an idle/blocking `sshd-session` around the expected `serverloop.c` poll wait, not a demonstrated OpenSSH runaway loop. If later evidence finds a real loop, prefer a small bounded state-machine/deadline fix using the existing helpers and avoid awkward control flow such as unnecessary `goto`.

## Risks
A speculative OpenSSH patch here could alter authentication/session timing or privilege-separation behavior without proving the issue. The observed kernel hot path may instead be from process teardown, memory-map churn, profiler attribution, libc/runtime behavior, PAM/NSS/systemd interaction, or a kernel

[truncated]

Issue page: /issues/019e3bb6-99da-7633-a03f-ffc809964630. Issue JSON: /v1/issues/019e3bb6-99da-7633-a03f-ffc809964630

sshd-session is stuck in a likely unclassified userspace loop: 28.07% of sampled CPU passed through userfaultfd_unmap_complete, with repeated thread backtraces show 1 thread(s) around 0x00007fa9b889a7d2 in ?? () from target:<path>.

## 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): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `openssh` 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.

Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `openssh` 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 `openssh` 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): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, 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/lib/openssh/sshd-session` with a “runaway CPU” label, but the captured evidence does not isolate an OpenSSH source defect. The sampled process was `S (sleeping)`, blocked in `poll_schedule_timeout`/`restart_syscall`, with only one strace line over 5 seconds and total sampled CPU of 0.3%. Hot symbols were mostly kernel-side (`userfaultfd_unmap_complete`, `fput`, `wait_consider_task`) and the userspace backtrace was unsymbolized.

## Evidence Confidence
inferred

## Proposed Subject
No source patch yet: diagnose the `sshd-session` poll-wait report and require symbolized/reproducible evidence before changing OpenSSH session-loop code.

## Patch Plan
Do not edit files in this pass. The evidence is profiler-only/indirect and touches `sshd-session`, privilege separation, authentication-adjacent session handling, and root-owned server processes, so this is security-sensitive. A source patch should be blocked until the behavior is reproduced and its security impact is understood.

Relevant code path inspected: `sshd-session.c` is the session entrypoint, and the post-auth loop is in `serverloop.c::server_loop2()` / `wait_until_can_do_something()`, which intentionally sleeps in `ppoll()` using local timeout helpers from `misc.c` (`ptimeout_init`, `ptimeout_deadline_*`, `ptimeout_get_tsp`) plus `monotime()`. Packet output waits use `ssh_packet_write_poll()` / `ssh_packet_write_wait()` in `packet.c`. These are the maintainer conventions any future patch should follow.

No relevant prior Fixer patch was found in the workspace. I would not plan speculative control-flow changes, timeout hacks, or avoidable `goto` cleanup around the event loop without a reproducer showing a bad wakeup, missed timeout, or fd readiness bug.

## Risks
A speculative patch could change authentication/session timing, keepalive behavior, child collection, or channel I/O semantics without fixing the observed kernel-side sample. The current evidence may instead describe a normal sleeping session, a kernel/runtime artifact, or an external process-state issue.

## Validation
First try the project-level entrypoint from the workspace root:

```sh
./configure && make
```

If that fails due to missing dependencies or generated files, record the exact command and failure, then run the narrow relevant build:

```sh
make sshd-session
```

Bounded independent reproduction attempt before any future source edit: build with symbols if feasible, then run a short local `sshd`/`ssh` session under `timeout` with `strace -f -tt -e poll,ppoll,restart_syscall` and confirm whether `sshd-session` actually spins or merely blocks in `ppoll()`. Do not claim reproduction unless that command shows repeated wakeups or sustained CPU attributable to OpenSSH userspace.

## Patch Pass

Subject: no patch: diagnose sshd-session poll profile

## Commit Message
No source change. The collected evidence points to an `sshd-session` process sleeping in the normal poll wait path, not to a reproduced OpenSSH userspace loop. A timing-sensitive server-loop patch would need stronger evidence before it is upstreamable.

## Evidence Confidence
inferred

## Issue Connection
Fixer collected a profile for `/usr/lib/openssh/sshd-session` labelled as runaway CPU, with samples mentioning `userfaultfd_unmap_complete` and a backtrace through `poll`. The `/proc` evidence also says the process was `S (sleeping)`, `wchan` was `poll_schedule_timeout.constprop.0`, strace saw only one `restart_syscall(<... resuming interrupted poll ...>)` line over 5 seconds, and aggregate CPU was only 0.3%.

The likely root cause is not an identified OpenSSH busy loop. The stronger inference is that the sample caught a normal or interrupted `poll` sleep, with hot attribution in kernel/libc paths rather than symbolized OpenSSH code.

I followed the saved plan and did not change course. I inspected the session loop and found `serverloop.c::wait_until_can_do_something()` intentionally sleeping in `ppoll()` via OpenSSH’s local timeout helpers: `ptimeout_init`, `ptimeout_deadline_*`, `ptimeout_get_tsp`, and `monotime`. The surrounding code also follows local logging/error conventions such as `debug`, `logit`, `fatal_f`, and `fatal_fr`. Only `README.md` was present among the requested contribution/style docs.

No patch was made because changing `sshd-session` polling, keepalive, child collection, or privilege-separated session timing is security-sensitive and the failure was not reproduced. The expected effect is to avoid landing a speculative behavior change until a symbolized trace or local reproducer shows repeated wakeups, sustained CPU, or a specific missed-timeout bug in OpenSSH code.

## Git Add Paths
None

## Validation
Ran project-level entrypoint from the workspace root:

```sh
./configure && make
```

Result: failed before build with:

```text
configure: error: ./configure.ac newer than configure, run autoreconf
```

Ran focused build fallback:

```sh
make sshd-session
```

Result: failed because configuration was not generated:

```text
includes.h:19:10: fatal error: config.h: No such file or directory
```

Attempted bounded independent reproduction with strace:

```sh
timeout 5s strace -f -tt -e poll,ppoll,restart_syscall /usr/lib/openssh/sshd-session
```

Result: blocked by sandbox ptrace restrictions:

```text
PTRACE_TRACEME: Operation not permitted
ptrace(PTRACE_SEIZE, 7): Operation not permitted
```

Ran direct smoke command:

```sh
timeout 5s /usr/lib/openssh/sshd-session
```

Result: exited immediately with `sshd-session should not be executed directly`; no CPU loop was reproduced.

## Review Pass 1

RESULT: ok

The first pass correctly leaves no source diff for indirect, profiler-only evidence in a security-sensitive `sshd-session` timing area. It classifies confidence as `inferred`, lists `Git Add Paths` as `None`, and does not overstate the evidence as a reproduced OpenSSH bug.

Validation is acceptable for a no-patch diagnosis: it attempted `./configure && make`, reported the exact `configure.ac newer than configure` blocker, attempted `make sshd-session`, reported the missing `config.h` blocker, and documented the blocked strace reproduction attempt. The write-up names the relevant local helpers and conventions (`ptimeout_*`, `monotime`, `debug`, `logit`, `fatal_f`, `fatal_fr`) and only `README.md` was found among the requested docs.

## Plan Pass

## Problem
Fixer observed `/usr/lib/openssh/sshd-session` with a “runaway CPU” label, but the captured evidence does not isolate an OpenSSH source defect. The sampled process was `S (sleeping)`, blocked in `poll_schedule_timeout`/`restart_syscall`, with only one strace line over 5 seconds and total sampled CPU of 0.3%. Hot symbols were mostly kernel-side (`userfaultfd_unmap_complete`, `fput`, `wait_consider_task`) and the userspace backtrace was unsymbolized.

## Evidence Confidence
inferred

## Proposed Subject
No source patch yet: diagnose the `sshd-session` poll-wait report and require symbolized/reproducible evidence before changing OpenSSH session-loop code.

## Patch Plan
Do not edit files in this pass. The evidence is profiler-only/indirect and touches `sshd-session`, privilege separation, authentication-adjacent session handling, and root-owned server processes, so this is security-sensitive. A source patch should be blocked until the behavior is reproduced and its security impact is understood.

Relevant code path inspected: `sshd-session.c` is the session entrypoint, and the post-auth loop is in `serverloop.c::server_loop2()` / `wait_until_can_do_something()`, which intentionally sleeps in `ppoll()` using local timeout helpers from `misc.c` (`ptimeout_init`, `ptimeout_deadline_*`, `ptimeout_get_tsp`) plus `monotime()`. Packet output waits use `ssh_packet_write_poll()` / `ssh_packet_write_wait()` in `packet.c`. These are the maintainer conventions any future patch should follow.

No relevant prior Fixer patch was found in the workspace. I would not plan speculative control-flow changes, timeout hacks, or avoidable `goto` cleanup around the event loop without a reproducer showing a bad wakeup, missed timeout, or fd readiness bug.

## Risks
A speculative patch could change authentication/session timing, keepalive behavior, child collection, or channel I/O semantics without fixing the observed kernel-side sample. The current evidence may instead describe a normal sleeping session, a kernel/runtime artifact, or an external process-state issue.

## Validation
First try the project-level entrypoint from the workspace root:

```sh
./configure && make
```

If that fails due to missing dependencies or generated files, record the exact command and failure, then run the narrow relevant build:

```sh
make sshd-session
```

Bounded independent 

[truncated]

Issue page: /issues/019e3b1d-655e-7390-ba69-f3938798d021. Issue JSON: /v1/issues/019e3b1d-655e-7390-ba69-f3938798d021

sshd-session is stuck in a likely unclassified userspace loop: 21.97% of sampled CPU passed through unmap_vmas, with repeated thread backtraces show 1 thread(s) around 0x00007f8fa7c9a7d2 in ?? () from target:<path>.

## 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): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `openssh` 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.

Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `openssh` 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 `openssh` 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): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, 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 `sshd-session: gis [priv]` in a profiler-driven runaway-process investigation, but the collected signal does not identify a concrete OpenSSH source defect. The sampled process was sleeping in `poll_schedule_timeout` / `restart_syscall`, with only one strace line over 5 seconds, `max_cpu_percent` of 0.7, and low loop confidence (`0.42`). Hot samples point mostly at kernel VM work and PAM/SELinux/systemd-related DSOs, not a named OpenSSH loop.

## Evidence Confidence

observed

## Proposed Subject

No source patch: diagnose insufficient evidence for an OpenSSH `sshd-session` CPU-loop fix

## Patch Plan

Do not edit files in this pass. Treat this as a no-patch upstream diagnosis/report because the path is security-sensitive: it involves privileged `sshd-session`, PAM/session handling, and authentication-adjacent monitor code.

Relevant local code inspected:
- `sshd-session.c`: post-auth path calls `do_pam_setcred()`, `do_pam_session()`, then `privsep_postauth()`.
- `monitor.c`: privileged monitor waits in `monitor_read()` using `poll(..., -1)`, matching the captured sleeping `poll` state.
- `auth-pam.c`: PAM setup/session helpers use OpenSSH conventions such as `xcalloc`, `sshbuf`, `fatal_f`, `debug*_f`.
- Docs found: `README.md`, `README`, `README.privsep`, `README.platform`, `SECURITY.md`; no separate `CONTRIBUTING`/`HACKING` doc was found by the requested scan.

No prior Fixer patch is present in the worktree (`git status --short` was clean), so there is no previous patch to improve or replace.

A future source patch would require an independent reproduction that shows OpenSSH itself spinning or mishandling a specific event/FD/PAM transition. It should follow local helpers and conventions (`xmalloc`/`xcalloc`, `sshbuf`, `atomicio`, `fatal_f`/`debug*_f`) and avoid awkward control flow such as adding a broad `goto` around the monitor poll loop when a bounded state check or helper would be clearer.

## Risks

Changing this area without reproduction risks altering privileged monitor, PAM, authentication, or session semantics based only on profiler correlation. The current evidence may instead reflect an interrupted blocking poll, kernel/PAM module behavior, SELinux/PAM cleanup, or normal idle session state.

Raw artifact paths referenced in `evidence.json` were not available under `/var/lib/fixer/investigations`, so the diagnosis is limited to the bundled JSON excerpts and source inspection.

## Validation

Before any future patch, run the project-level entrypoint from the workspace root:

```sh
./configure && make
```

If that fails because dependencies or generated files are missing, record the exact failure and then run the narrowest relevant build target, likely the built `sshd-session`/`sshd` objects after configuration.

Bounded independent reproduction attempt before editing: build with symbols, start a loopback-only temporary `sshd` test instance with an isolated config and host key, exercise one login/session path, and sample the resulting `sshd-session [priv]` with `strace`/`perf`/`gdb` only long enough to see whether the same CPU-hot `poll`/`unmap_vmas` signal appears. Do not claim `reproduced` unless that command actually shows the failure.

## Patch Pass

Subject: diagnosis: do not patch sshd-session from indirect poll samples

## Commit Message

No source change. The collected `sshd-session` signal is indirect profiler and `/proc` evidence from a privileged OpenSSH session process, but it does not identify an OpenSSH loop or a failing monitor/PAM transition. Because this path touches authentication, PAM credentials, and privileged session handling, a source patch needs local reproduction and security-impact analysis first.

## Evidence Confidence

inferred

## Issue Connection

Fixer collected a `sshd-session: gis [priv]` sample where the process was in state `S (sleeping)`, blocked in `poll_schedule_timeout`, with strace showing only `restart_syscall(<... resuming interrupted poll ...>)` over 5 seconds. The perf hot symbols were mostly kernel/PAM/SELinux-adjacent (`unmap_vmas`, `pam_selinux.so`, `datagram_poll_queue`) and the profile reported only 0.7% max CPU with low loop confidence.

The cautious code-level inference is that the evidence matches the privileged monitor process waiting in `monitor_read()` on `poll(..., -1)`, which is normal control flow for the privilege-separated monitor. The post-auth path also passes through PAM credential/session setup before `privsep_postauth()`, but the bundle does not show a specific OpenSSH source loop, FD storm, repeated syscall, or bad state transition.

I followed the saved plan and made no source change. This is security-sensitive code: a speculative mitigation in monitor, PAM, authentication, credential, or timing behavior would risk changing login/session semantics without reproduced evidence.

The expected effect is no runtime behavior change. This leaves a diagnosis suitable for upstream review and avoids landing a patch that is not pull-request-ready.

Local conventions inspected: `README.md` documents normal `./configure`/`make` flow and PAM support; no `CONTRIBUTING`, `HACKING`, `README-hacking`, `docs/`, or `dev-docs/` entry was found by the requested scan. Nearby code uses OpenSSH helpers and conventions including `xmalloc`/`xcalloc`, `sshbuf`, `atomicio`, `fatal_f`, and `debug*_f`.

## Git Add Paths

None

## Validation

Required workspace-root entrypoint:

```sh
./configure && make
```

Result: failed before compilation with:

```text
configure: error: ./configure.ac newer than configure, run autoreconf
```

To avoid dirtying the proposal workspace, I copied the checkout to `/tmp/openssh-90451-validation` and ran:

```sh
autoreconf
./configure
make
```

Result: `autoreconf` completed with obsolete macro warnings, `./configure` completed, and `make` completed successfully in the temporary copy. Configure reported `PAM support: no` because PAM headers were not present there, so this validates a generic build but not the PAM-enabled path from the evidence.

Bounded reproduction attempt:

```sh
pgrep -a sshd-session || true
ps -C sshd-session -o pid,ppid,stat,pcpu,wchan:32,cmd || true
find /var/lib/fixer/investigations -maxdepth 1 -type d -name '*sshd-session*' -print || true
```

Result: no active `sshd-session` process was available to sample, and the referenced raw investigation directory was not present under `/var/lib/fixer/investigations`. I did not reproduce the failure locally.

## Review Pass 1

RESULT: ok

No blocking findings.

The workspace has no source diff and `Git Add Paths` is `None`, which is appropriate for this evidence level and the security-sensitive `sshd-session`/PAM/privsep area. The author does not claim reproduction, does not invent a user-visible crash or command line, and keeps the confidence at `inferred`, matching the indirect perf/strace evidence.

Validation is acceptable for a no-patch diagnosis: `./configure && make` was attempted from the workspace root and the exact generated-file blocker was reported; a regenerated temporary-copy build completed; and the bounded reproduction attempt clearly reports that no live `sshd-session` process or raw investigation directory was available. The maintainer-facing explanation connects the sampled sleeping `poll` state to the inspected monitor/PAM/session paths without overstating certainty.

## Plan Pass

## Problem

Fixer observed `sshd-session: gis [priv]` in a profiler-driven runaway-process investigation, but the collected signal does not identify a concrete OpenSSH source defect. The sampled process was sleeping in `poll_schedule_timeout` / `restart_syscall`, with only one strace line over 5 seconds, `max_cpu_percent` of 0.7, and low loop confidence (`0.42`). Hot samples point mostly at kernel VM work and PAM/SELinux/systemd-related DSOs, not a named OpenSSH loop.

## Evidence Confidence

observed

## Proposed Subject

No source patch: diagnose insufficient evidence for an OpenSSH `sshd-session` CPU-loop fix

## Patch Plan

Do not edit files in this pass. Treat this as a no-patch upstream diagnosis/report because the path is security-sensitive: it involves privileged `sshd-session`, PAM/session handling, and authentication-adjacent monitor code.

Relevant local code inspected:
- `sshd-session.c`: post-auth path calls `do_pam_setcred()`, `do_pam_session()`, then `privsep_postauth()`.
- `monitor.c`: privileged monitor waits in `monitor_read()` using `poll(..., -1)`, matching the captured sleeping `poll` state.
- `auth-pam.c`: PAM setup/session helpers use OpenSSH conventions such as `xcalloc`, `sshbuf`, `fatal_f`, `debug*_f`.
- Docs found: `README.md`, `README`, `README.privsep`, `README.platform`, `SECURITY.md`; no separate `CONTRIBUTING`/`HACKING` doc was found by the requested scan.

No prior Fixer patch is present in the worktree (`git status --short` was clean), so there is no previous patch to improve or replace.

A future source patch would require an independent reproduction that shows OpenSSH itself spinning or mishandling a specific event/FD/PAM transition. It should follow local helpers and conventions (`xmalloc`/`xcalloc`, `sshbuf`, `atomicio`, `fatal_f`/`debug*_f`) and avoid awkward control flow such as adding a broad `goto` around the monitor poll loop when a bounded state check or helper would be clearer.

## Risks

Changing this area without reproduction risks altering privileged monitor, PAM, authentication, or session semantics based only on profiler correlation. The current evidence may instead reflect an interrupted blocking poll, kernel/PAM module behavior, SELinux/PAM cleanup, or normal idle session state.

Raw artifact paths referenced in `evidence.json` were not available under `/var/lib/fixer/investigations`, so the d

[truncated]

Issue page: /issues/019e3974-86e3-7021-8ac6-1c08dfe2d29d. Issue JSON: /v1/issues/019e3974-86e3-7021-8ac6-1c08dfe2d29d

sshd-session is stuck in a likely unclassified userspace loop: 8.90% of sampled CPU passed through __memcg_slab_free_hook, with repeated thread backtraces show 1 thread(s) around 0x00007f9041a9a7d2 in ?? () from target:<path>.

## 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): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `openssh` 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.

Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `openssh` 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 `openssh` 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): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, 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/lib/openssh/sshd-session` as a possible runaway process, but the embedded evidence shows a sleeping privileged session process blocked in `poll`/`restart_syscall`, `wchan=poll_schedule_timeout`, only one strace line over 5s, and total sampled CPU of 0.1%. The hot symbols are mostly kernel memory-management paths, not OpenSSH userspace frames. This does not currently justify an upstream OpenSSH source patch, especially because `sshd-session` is authentication/session/privilege-separation code.

## Evidence Confidence
inferred

## Proposed Subject
No source patch: diagnose low-confidence `sshd-session` runaway-process report as insufficiently actionable without a reproduced or symbolized userspace loop.

## Patch Plan
Do not edit files in this pass. The next investigation should collect stronger evidence before any patch: symbolized OpenSSH frames for the installed `sshd-session`, the missing raw `gdb`/`strace`/fd artifacts, and a longer `perf top`/`perf record` sample that distinguishes OpenSSH userspace CPU from kernel work during normal polling.

Source inspection found the relevant loop in `serverloop.c:wait_until_can_do_something()`, which uses OpenSSH’s existing `ptimeout_*` helpers from `misc.c`, `channel_prepare_poll()`/`channel_after_poll()` from `channels.c`, `ppoll()`, `monotime()`, and `fatal_f()`/`debug()` logging conventions. No local helper appears missing from the observed path, and the evidence does not identify a bad timeout, channel fd spin, or repeated syscall loop to fix. No prior Fixer patch for this issue was found in the workspace; there is nothing to improve or replace.

If later evidence proves an OpenSSH poll spin, any patch should stay in the bounded server/channel loop, use the existing timeout/channel helpers, and avoid awkward control flow such as an avoidable `goto`.

## Risks
A speculative patch here could change authentication/session timing, keepalive, child reaping, or channel shutdown behavior without proving the reported condition. That is security-sensitive and regression-prone. The current evidence may instead reflect a normal idle session, interrupted `poll`, external kernel memory-management cost, PAM/systemd interaction, or profiler attribution noise.

## Validation
Before any future source patch, try the project entrypoint from the workspace root: `./configure && make`. If dependencies or generated files are missing, report the exact failure and then run the narrowest reproducible compile, likely `make sshd-session`.

For independent reproduction, run a bounded local smoke/profiling attempt only after building: start a temporary `sshd` using the built `sshd`, `sshd-session`, and `sshd-auth` paths on a localhost high port, attempt one localhost connection, and sample the resulting `sshd-session` with `strace -tt -p <pid>` or `perf stat -p <pid>` for a short timeout. Do not claim `reproduced` unless that actually shows repeated userspace activity or CPU consumption matching the Fixer signal.

## Patch Pass

Subject: no patch: diagnose sshd-session poll wait evidence

## Commit Message
No source change is made. The collected signal points to an `sshd-session` process sleeping in the server poll loop, not to a demonstrated OpenSSH userspace spin. Changing session timing or authentication-adjacent control flow without reproduced evidence would be unsafe for upstream.

## Evidence Confidence
inferred

## Issue Connection
The collected signal is a Fixer profiler report for `/usr/lib/openssh/sshd-session`: perf attributed samples mostly to kernel memory-management symbols, `/proc` reported state `S (sleeping)`, `wchan` was `poll_schedule_timeout`, and strace captured only `restart_syscall(<... resuming interrupted poll ...>)` over 5 seconds. CPU in the profile target was only 0.1%.

The cautious code-level inference is that the sampled process was blocked in the normal server event wait, not spinning in OpenSSH. The relevant code path is `server_loop2()` calling `wait_until_can_do_something()`, which uses the local `ptimeout_*` helpers, `channel_prepare_poll()`/`channel_after_poll()`, `ppoll()`, and OpenSSH logging conventions such as `fatal_f()`/`debug_f()`. No missing wrapper or bounded fix was found.

I made no source change. This follows the saved plan; I did not change course. Because this area affects session handling, authentication-adjacent process state, and timing behavior, a source patch should wait for symbolized userspace frames or a reproduced poll spin.

The expected effect is no runtime behavior change; this leaves a bug-report-ready diagnosis instead of a speculative patch.

## Git Add Paths
None

## Validation
Checked contribution/style docs with `rg --files -g 'CONTRIBUTING*' -g 'HACKING*' -g 'README-hacking*' -g 'README.md' -g 'docs/**' -g 'dev-docs/**'`; only `README.md` was present. It documents the normal `./configure`, `make`, and `make tests` flow.

Ran project entrypoint from workspace root: `./configure && make`. It failed before compilation with: `configure: error: ./configure.ac newer than configure, run autoreconf`.

To avoid generated-file churn in the proposal workspace, copied the tree to `/tmp/openssh-90440-build.wf5Q9t`, ran `autoreconf`, then ran `./configure && make sshd-session`; `sshd-session` built successfully there.

Independent reproduction attempt: `ps -C sshd-session -o pid,stat,pcpu,comm,args` found no live `sshd-session` process to sample, so I could not reproduce the reported runtime signal. The raw artifact directory named in `evidence.json` was also absent.

## Review Pass 1

RESULT: ok

No source changes are present in the workspace, and the author correctly treats the evidence as `inferred` rather than presenting a speculative OpenSSH bug fix. The diagnosis matches the evidence: sleeping `sshd-session`, `poll_schedule_timeout`, one interrupted `poll` syscall, low CPU, and kernel-heavy perf symbols.

The response includes the required sections, lists `None` under `## Git Add Paths`, names relevant local helpers/conventions (`ptimeout_*`, channel poll helpers, `fatal_f()`/`debug_f()`), and avoids a security-sensitive source patch without reproduced behavior. Validation is acceptable: the project entrypoint `./configure && make` was attempted and its exact blocker was reported, followed by a reproducible fallback build of `sshd-session` in a regenerated temporary tree.

## Plan Pass

## Problem
Fixer flagged `/usr/lib/openssh/sshd-session` as a possible runaway process, but the embedded evidence shows a sleeping privileged session process blocked in `poll`/`restart_syscall`, `wchan=poll_schedule_timeout`, only one strace line over 5s, and total sampled CPU of 0.1%. The hot symbols are mostly kernel memory-management paths, not OpenSSH userspace frames. This does not currently justify an upstream OpenSSH source patch, especially because `sshd-session` is authentication/session/privilege-separation code.

## Evidence Confidence
inferred

## Proposed Subject
No source patch: diagnose low-confidence `sshd-session` runaway-process report as insufficiently actionable without a reproduced or symbolized userspace loop.

## Patch Plan
Do not edit files in this pass. The next investigation should collect stronger evidence before any patch: symbolized OpenSSH frames for the installed `sshd-session`, the missing raw `gdb`/`strace`/fd artifacts, and a longer `perf top`/`perf record` sample that distinguishes OpenSSH userspace CPU from kernel work during normal polling.

Source inspection found the relevant loop in `serverloop.c:wait_until_can_do_something()`, which uses OpenSSH’s existing `ptimeout_*` helpers from `misc.c`, `channel_prepare_poll()`/`channel_after_poll()` from `channels.c`, `ppoll()`, `monotime()`, and `fatal_f()`/`debug()` logging conventions. No local helper appears missing from the observed path, and the evidence does not identify a bad timeout, channel fd spin, or repeated syscall loop to fix. No prior Fixer patch for this issue was found in the workspace; there is nothing to improve or replace.

If later evidence proves an OpenSSH poll spin, any patch should stay in the bounded server/channel loop, use the existing timeout/channel helpers, and avoid awkward control flow such as an avoidable `goto`.

## Risks
A speculative patch here could change authentication/session timing, keepalive, child reaping, or channel shutdown behavior without proving the reported condition. That is security-sensitive and regression-prone. The current evidence may instead reflect a normal idle session, interrupted `poll`, external kernel memory-management cost, PAM/systemd interaction, or profiler attribution noise.

## Validation
Before any future source patch, try the project entrypoint from the workspace root: `./configure && make`. 

[truncated]

Issue page: /issues/019e3897-43e2-7bc1-bd26-5289206dec0b. Issue JSON: /v1/issues/019e3897-43e2-7bc1-bd26-5289206dec0b

sshd-session is stuck in a likely unclassified userspace loop: 59.49% of sampled CPU passed through __free_one_page, with repeated thread backtraces show 1 thread(s) around 0x00007fc38ce9a7d2 in ?? () from target:<path>.

## 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): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `openssh` 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.

Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `openssh` 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 `openssh` 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): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, 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 an installed Debian `sshd-session` process reported as a runaway CPU candidate, but the evidence is contradictory: total CPU was only `0.4%`, process state was `S (sleeping)`, `wchan` was `poll_schedule_timeout.constprop.0`, and `strace` captured only `restart_syscall`. The hot kernel symbol `__free_one_page` and unresolved user frames do not identify an OpenSSH source-level loop.

## Evidence Confidence
observed

## Proposed Subject
No source patch: diagnose inconclusive `sshd-session` poll/profile signal before changing OpenSSH session code

## Patch Plan
Do not edit source in this pass. Treat this as an upstream OpenSSH patch gate, not a Debian-local workaround.

I inspected `README.md`, `serverloop.c`, `packet.c`, `channels.c`, `misc.c`, `sshd-session.c`, Debian patches, and the applied patch stack. No prior Fixer patch for `90403` was present. Relevant maintainer conventions/helpers found: `ptimeout_*` for poll deadlines, `channel_prepare_poll()` / `channel_after_poll()` for channel event setup, `ssh_packet_*` / `sshbuf_*` for packet IO, `xrecallocarray()` for pollfd allocation, and `fatal_f` / `logit` style logging. The observed stack aligns with the normal `server_loop2()` wait path around `ppoll()`, not with a proven busy loop.

Because this touches `sshd-session` runtime/session behavior and any timeout/event-loop change would affect security-sensitive availability and timing behavior, I would block a source patch until a reproducible high-CPU loop or symbolized source frame is collected. Avoid adding awkward control flow such as a defensive `goto` or arbitrary sleep/throttle around `ppoll()`; that would mask the profiler signal without proving causality.

## Risks
A speculative event-loop patch could alter SSH keepalive, rekey, channel, child-exit, or unused-connection timeout behavior. It could also degrade responsiveness or hide a kernel/PAM/systemd-side issue, since the evidence implicates kernel memory freeing and shows sleeping `poll`, not active userspace spinning.

## Validation
First try the project entrypoint from the workspace root: `./configure && make`.

If that fails, report the exact failing command and dependency/generated-file reason, then run the narrowest relevant build target, likely `make sshd-session`.

Bounded independent reproduction attempt before any source patch: start a local built `sshd` on a high port with temporary host keys/config, make one loopback session, then sample the resulting `sshd-session` for a few seconds with `ps -o state,pcpu,wchan,cmd` and, if permitted, short `strace -p`. Only claim `reproduced` if that shows sustained high CPU with a repeatable OpenSSH source path; otherwise report the Fixer signal as observed-only and request symbolized target traces/perf data.

## Patch Pass

Subject: No source patch for inconclusive sshd-session profile

## Commit Message
No source change is proposed. The collected data points at a sleeping `sshd-session` in the normal poll wait path, not at a proven OpenSSH busy loop. Changing session event-loop timing without a reproducible failure would risk altering SSH keepalive, rekey, channel, and child-exit behavior.

## Evidence Confidence
inferred

## Issue Connection
The collected signal is a Fixer profiler/strace report for `/usr/lib/openssh/sshd-session`: one sampled process was classified as a possible runaway, with `__free_one_page` hot in the kernel and an unresolved userspace frame. The same evidence says the process had only `0.4%` total CPU, was in `S (sleeping)` state, had `wchan` set to `poll_schedule_timeout.constprop.0`, and produced only `restart_syscall` during a 5 second `strace`.

The likely root cause is an inconclusive or false-positive runaway classification, or activity outside a clear OpenSSH source loop. The OpenSSH source path matching the stack is the normal `server_loop2()` event loop: it prepares channel descriptors with `channel_prepare_poll()`, computes deadlines with `ptimeout_*`, then sleeps in `ppoll()` until network, channel, signal, keepalive, rekey, or timeout work is due.

I did not make a source change. This follows the saved plan’s no-patch direction, with one explicit course correction: the new prompt classifies profiler/strace-only evidence as `inferred`, so I am using `inferred` rather than the plan’s earlier `observed`.

The expected effect is no behavioral change. For an upstreamable patch, the next evidence should be a symbolized userspace profile or a local reproduction showing sustained high CPU in a specific OpenSSH function. Because this area affects SSH session timing/throttling behavior, a speculative mitigation would need reproduced evidence plus security-impact analysis before landing.

## Git Add Paths
None

## Validation
`./configure && make` from the workspace root failed before compilation:
`configure: error: ./configure.ac newer than configure, run autoreconf`

Focused workspace-root compile also failed because the tree was not configured:
`make sshd-session`
Failure: `includes.h:19:10: fatal error: config.h: No such file or directory`

To avoid dirtying the proposal workspace, I copied the tree to `/tmp/openssh-90403-build.ymw9XL/src` and ran:
`autoreconf`
Result: exit 0, with obsolete `AC_TRY_COMPILE` warnings.

Then:
`./configure`
Result: exit 0.

Then:
`make sshd-session`
Result: exit 0; `sshd-session` linked successfully in the temporary copy.

Independent reproduction attempt:
`ps -C sshd-session -o pid,stat,pcpu,wchan:32,comm,args`
Result: no live `sshd-session` process was visible in this sandbox, so I could not reproduce or sample the reported high-CPU signal locally.

`git status --short` in the proposal workspace was clean.

## Review Pass 1

RESULT: ok

No source diff is present, and the author correctly returned a no-patch diagnosis for indirect profiler/strace evidence in security-sensitive session timing code.

The write-up includes the required `## Evidence Confidence` section with `inferred`, does not claim reproduction, does not invent a user-visible failure, and connects the collected `/proc`, `strace`, and profile signal to the normal `server_loop2()` / `ppoll()` wait path. It also names relevant local helpers and conventions: `ptimeout_*`, `channel_prepare_poll()`, `ssh_packet_*`, and `sshbuf_*`.

Validation is acceptable: the project-level `./configure && make` was attempted and the exact blocker was reported, then a focused `sshd-session` build was run in a temporary configured copy. The independent reproduction attempt was bounded and correctly reported as not reproduced because no live `sshd-session` process was visible.

## Plan Pass

## Problem
Fixer observed an installed Debian `sshd-session` process reported as a runaway CPU candidate, but the evidence is contradictory: total CPU was only `0.4%`, process state was `S (sleeping)`, `wchan` was `poll_schedule_timeout.constprop.0`, and `strace` captured only `restart_syscall`. The hot kernel symbol `__free_one_page` and unresolved user frames do not identify an OpenSSH source-level loop.

## Evidence Confidence
observed

## Proposed Subject
No source patch: diagnose inconclusive `sshd-session` poll/profile signal before changing OpenSSH session code

## Patch Plan
Do not edit source in this pass. Treat this as an upstream OpenSSH patch gate, not a Debian-local workaround.

I inspected `README.md`, `serverloop.c`, `packet.c`, `channels.c`, `misc.c`, `sshd-session.c`, Debian patches, and the applied patch stack. No prior Fixer patch for `90403` was present. Relevant maintainer conventions/helpers found: `ptimeout_*` for poll deadlines, `channel_prepare_poll()` / `channel_after_poll()` for channel event setup, `ssh_packet_*` / `sshbuf_*` for packet IO, `xrecallocarray()` for pollfd allocation, and `fatal_f` / `logit` style logging. The observed stack aligns with the normal `server_loop2()` wait path around `ppoll()`, not with a proven busy loop.

Because this touches `sshd-session` runtime/session behavior and any timeout/event-loop change would affect security-sensitive availability and timing behavior, I would block a source patch until a reproducible high-CPU loop or symbolized source frame is collected. Avoid adding awkward control flow such as a defensive `goto` or arbitrary sleep/throttle around `ppoll()`; that would mask the profiler signal without proving causality.

## Risks
A speculative event-loop patch could alter SSH keepalive, rekey, channel, child-exit, or unused-connection timeout behavior. It could also degrade responsiveness or hide a kernel/PAM/systemd-side issue, since the evidence implicates kernel memory freeing and shows sleeping `poll`, not active userspace spinning.

## Validation
First try the project entrypoint from the workspace root: `./configure && make`.

If that fails, report the exact failing command and dependency/generated-file reason, then run the narrowest relevant build target, likely `make sshd-session`.

Bounded independent reproduction attempt before any source patch: start a local built 

[truncated]

Issue page: /issues/019e36ed-9368-71d2-93bc-ea96cfa15d92. Issue JSON: /v1/issues/019e36ed-9368-71d2-93bc-ea96cfa15d92

sshd-session is stuck in a likely unclassified userspace loop: 20.12% of sampled CPU passed through kmem_cache_free, with repeated thread backtraces show 1 thread(s) around 0x00007f3f9ca9a7d2 in ?? () from target:<path>.

## 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): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `openssh` 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.

Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `openssh` 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 `openssh` 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): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, 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 an `sshd-session` process associated with a runaway CPU investigation, but the evidence does not identify a concrete OpenSSH defect. The JSON shows `max_cpu_percent: 0.9`, process state `S (sleeping)`, `wchan: poll_schedule_timeout.constprop.0`, a one-line strace stuck in `restart_syscall`, and a backtrace through `poll()`. That matches normal blocking in the post-auth server event loop more than a confirmed userspace spin.

## Evidence Confidence
inferred

## Proposed Subject
No source patch: diagnose insufficient evidence for an upstream OpenSSH CPU-loop fix in `sshd-session`.

## Patch Plan
Do not edit source in this pass. The candidate code path is `server_loop2()` / `wait_until_can_do_something()` in `serverloop.c`, using local OpenSSH helpers `ptimeout_init`, `ptimeout_deadline_*`, `ptimeout_get_tsp`, `channel_prepare_poll`, `channel_after_poll`, `ssh_packet_write_poll`, `fatal_f`, and `xrecallocarray`.

If a later patch is justified, first collect stronger evidence tying repeated wakeups to a specific descriptor, timeout, signal, or channel state. Avoid an awkward control-flow patch such as adding a defensive `goto` around the poll loop; any eventual fix should be a bounded local correction to timeout calculation, pollfd arming, or channel readiness handling using the existing helper conventions.

No prior Fixer patch for this finding was found in the workspace or Debian patch stack. Debian carries related OpenSSH patches such as `gssapi.patch`, `restore-tcp-wrappers.patch`, and `selinux-role.patch`, but none appears to address this profiler signal.

## Risks
`sshd-session` is security-sensitive: it participates in authentication, session setup, privilege separation, PAM/GSSAPI integration, and post-auth channel handling. A speculative timing or event-loop change could alter keepalive, rekey, child collection, channel closure, or session timeout behavior without proving it addresses the observed report.

The evidence bundle’s raw artifact paths are not available in this workspace, so fd targets and full strace/backtrace cannot be independently inspected beyond the JSON excerpts.

## Validation
Before any focused check, try the project-level entrypoint from the workspace root:

```sh
./configure && make
```

If dependencies or generated files are missing, record the exact failure and then run the narrowest reproducible check, likely a focused build of `sshd-session` after configure:

```sh
make sshd-session
```

For a bounded independent reproduction attempt, run a local debug `sshd`/client smoke test only if the build succeeds and local prerequisites are available, then observe whether an idle session repeatedly wakes or consumes CPU. Do not claim `reproduced` unless that command actually demonstrates the failure signal.

## Patch Pass

Subject: No patch: report inconclusive sshd-session CPU evidence

## Commit Message
No source change is proposed. The collected signal points at an `sshd-session` process blocked in `poll(2)` rather than a confirmed OpenSSH userspace spin, and changing the session event loop would touch security-sensitive timing/session behavior without reproduced evidence.

## Evidence Confidence
inferred

## Issue Connection
The collected signal was a Fixer runaway-process report for `sshd-session`: perf attributed sampled CPU to kernel `kmem_cache_free`, strace captured only a resumed `restart_syscall`, and `/proc` showed the process sleeping in `poll_schedule_timeout.constprop.0`. The cautious inference is that the process was interrupted while blocked in the normal server event loop, not that OpenSSH is repeatedly waking or spinning in a specific code path.

I inspected the relevant post-auth session loop, especially `server_loop2()` and `wait_until_can_do_something()`, plus channel polling in `channels.c`. The code already uses OpenSSH’s local helpers and conventions: `ptimeout_*` for poll deadlines, `channel_prepare_poll()` / `channel_after_poll()` for channel readiness, `xrecallocarray()` for pollfd allocation, and `fatal_f()` / `logit()` for diagnostics. `README.md` is the available contribution/build guidance; no separate `CONTRIBUTING`, `HACKING`, `docs/`, or `dev-docs/` files were present.

No source change was made. The expected effect is to avoid landing a speculative timing/session patch in authentication-adjacent OpenSSH code until stronger evidence identifies a specific descriptor, timeout, signal, or channel state causing repeated wakeups. This follows the saved plan; I did not change course.

## Git Add Paths
None

## Validation
Tried the requested workspace-root entrypoint:

```sh
./configure && make
```

It failed immediately with:

```text
configure: error: ./configure.ac newer than configure, run autoreconf
```

Then ran the narrow reproducible build path from the project guidance:

```sh
autoreconf && ./configure && make sshd-session
```

That completed successfully and linked `sshd-session`.

For an independent reproduction attempt, I checked for a live `sshd-session` process:

```sh
pgrep -a sshd-session || true
```

No process was present to profile or strace. I also checked the raw artifact paths named in `evidence.json`; `cmdline.txt`, `fd-targets.txt`, `strace.log`, and `gdb-bt.txt` were missing from `/var/lib/fixer/investigations/...`, so the collected runtime signal could not be independently reproduced or deepened in this workspace.

## Review Pass 1

RESULT: ok

No blocking review findings.

The workspace has no current source diff, and `patch-output.txt` correctly treats the evidence as `inferred` with `Git Add Paths: None`. That is appropriate for this security-sensitive `sshd-session` event-loop area because the bundle is profiler/trace evidence only and was not independently reproduced.

The author checked the available style/build guidance (`README.md`), named relevant local helpers (`ptimeout_*`, `channel_prepare_poll()`, `channel_after_poll()`, `xrecallocarray()`, `fatal_f()`, `logit()`), attempted the required project entrypoint (`./configure && make`) with the exact blocker, and then ran a reproducible narrower build (`autoreconf && ./configure && make sshd-session`). The explanation does not invent a reproducer or claim a confirmed upstream bug.

## Plan Pass

## Problem
Fixer observed an `sshd-session` process associated with a runaway CPU investigation, but the evidence does not identify a concrete OpenSSH defect. The JSON shows `max_cpu_percent: 0.9`, process state `S (sleeping)`, `wchan: poll_schedule_timeout.constprop.0`, a one-line strace stuck in `restart_syscall`, and a backtrace through `poll()`. That matches normal blocking in the post-auth server event loop more than a confirmed userspace spin.

## Evidence Confidence
inferred

## Proposed Subject
No source patch: diagnose insufficient evidence for an upstream OpenSSH CPU-loop fix in `sshd-session`.

## Patch Plan
Do not edit source in this pass. The candidate code path is `server_loop2()` / `wait_until_can_do_something()` in `serverloop.c`, using local OpenSSH helpers `ptimeout_init`, `ptimeout_deadline_*`, `ptimeout_get_tsp`, `channel_prepare_poll`, `channel_after_poll`, `ssh_packet_write_poll`, `fatal_f`, and `xrecallocarray`.

If a later patch is justified, first collect stronger evidence tying repeated wakeups to a specific descriptor, timeout, signal, or channel state. Avoid an awkward control-flow patch such as adding a defensive `goto` around the poll loop; any eventual fix should be a bounded local correction to timeout calculation, pollfd arming, or channel readiness handling using the existing helper conventions.

No prior Fixer patch for this finding was found in the workspace or Debian patch stack. Debian carries related OpenSSH patches such as `gssapi.patch`, `restore-tcp-wrappers.patch`, and `selinux-role.patch`, but none appears to address this profiler signal.

## Risks
`sshd-session` is security-sensitive: it participates in authentication, session setup, privilege separation, PAM/GSSAPI integration, and post-auth channel handling. A speculative timing or event-loop change could alter keepalive, rekey, child collection, channel closure, or session timeout behavior without proving it addresses the observed report.

The evidence bundle’s raw artifact paths are not available in this workspace, so fd targets and full strace/backtrace cannot be independently inspected beyond the JSON excerpts.

## Validation
Before any focused check, try the project-level entrypoint from the workspace root:

```sh
./configure && make
```

If dependencies or generated files are missing, record the exact failure and then run the narrowest repr

[truncated]

Issue page: /issues/019dc6b6-88af-72e2-b90c-b22b006d899b. Issue JSON: /v1/issues/019dc6b6-88af-72e2-b90c-b22b006d899b

sshd-auth is stuck in a likely busy poll loop: 100.00% of sampled CPU passed through do_syscall_64, with repeated read x3, write x2, clock_nanosleep x1.

## 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): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `openssh` 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. 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. 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.

Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `openssh` 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. 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 `openssh` 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): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, 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 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/lib/openssh/sshd-auth` as a likely busy-poll runaway, but the collected evidence does not show a runaway loop. The process was sleeping, used at most `0.8%` CPU, blocked in `read(3)` for about `1.4s`, slept in the auth failure delay for about `1.86s`, performed one short `ppoll(5)`, then exited after `ECONNRESET`.

## Evidence Confidence
inferred

## Proposed Subject
No source patch: diagnose the report as insufficient/contradictory busy-poll evidence for `sshd-auth`.

## Patch Plan
Do not edit OpenSSH in this pass. The evidence points to normal pre-auth control flow: monitor IPC via `atomicio()`/`sshbuf`, auth failure delay via `auth2.c` `nanosleep()`, packet flush via `ssh_packet_write_wait()`/`ppoll()`, then `logdie("Connection reset by ...")`.

If later evidence shows repeated immediate `ppoll()` wakeups without progress in the same process, investigate `packet.c` around `ssh_packet_read_seqnr()` and `ssh_packet_write_wait()` using existing `ptimeout_*` helpers from `misc.c`. Avoid adding awkward control flow such as avoidable `goto`; follow OpenSSH conventions already present here: `fatal_f`/`fatal_fr`, `debug3_f`, `sshbuf_*`, `atomicio()`, and bounded poll timeout helpers.

No prior Fixer patch was found in the workspace that should be replaced.

## Risks
A patch based only on this bundle would likely change mature auth/packet behavior without evidence of a bug. The trace may represent a transient hostile or reset SSH connection rather than a CPU runaway. Changing auth delay, packet flushing, or monitor IPC could regress security timing behavior or privilege-separation communication.

## Validation
Before any focused check, try the project-level entrypoint from the workspace root:

```sh
./configure && make
```

If dependencies or generated files are missing, record the exact failing command and stderr reason.

Bounded independent check, if continuing investigation: build locally, run a temporary `sshd`/`sshd-auth` auth attempt under `timeout` plus `strace -f -tt -T -e trace=read,write,ppoll,nanosleep,clock_nanosleep`, then confirm whether there are repeated immediate `ppoll()` returns without blocking. Do not claim reproduction unless that command actually shows the repeated busy-poll signal.

## Patch Pass

Subject: no patch: sshd-auth sample is not a busy poll

## Commit Message
No source change is proposed. The likely root cause is a false busy-poll classification: the collected `sshd-auth` trace shows normal pre-authentication blocking, auth failure delay, packet flush, connection reset handling, and exit rather than a tight event loop.

## Evidence Confidence
inferred

## Issue Connection
Fixer collected profiler, `strace`, and `/proc` evidence for `/usr/lib/openssh/sshd-auth` and classified it as a likely busy-poll runaway. The concrete signal does not support that conclusion: the process was in `S (sleeping)`, consumed at most `0.8%` CPU, blocked in `read(3)` for about `1.4s`, slept in `clock_nanosleep()` for about `1.86s`, performed one `ppoll(5)` lasting about `0.04s`, read `ECONNRESET`, logged “Connection reset by authenticating user root ...”, and exited.

The code-level inference is that this follows the existing pre-auth path: monitor IPC uses `atomicio()` and `sshbuf_*`, authentication failure timing uses `auth2.c` delay logic, and packet flushing uses `ssh_packet_write_wait()` with `ppoll()`. I followed the saved plan and did not change course: no source diff was left because the evidence is indirect and contradictory for a pull-request-ready OpenSSH patch. The expected effect is to avoid an unsafe upstream change to authentication timing, packet I/O, or privilege-separation monitor code without a reproduced or stronger observed defect.

I checked the available style/build documentation in `README.md`; no `CONTRIBUTING`, `HACKING`, `README-hacking`, `docs/`, or `dev-docs/` files were present. Relevant local conventions/helpers found were `atomicio()`, `sshbuf_*`, `fatal_f`/`fatal_fr`, `debug3_f`, and `ptimeout_*`.

## Git Add Paths
None

## Validation
`./configure && make` failed from the workspace root before compilation:

```text
configure: error: ./configure.ac newer than configure, run autoreconf
```

I did not run `autoreconf` because this was a no-patch diagnosis pass and it would rewrite generated files in the source tree.

Bounded independent reproduction attempt:

```sh
timeout 2s strace -f -tt -T -e trace=read,write,ppoll,nanosleep,clock_nanosleep /usr/lib/openssh/sshd-auth
```

This was blocked by sandbox ptrace restrictions:

```text
strace: do_test_ptrace_get_syscall_info: PTRACE_TRACEME: Operation not permitted
strace: attach: ptrace(PTRACE_SEIZE, 6): Operation not permitted
```

A direct smoke command also confirms `sshd-auth` is not a standalone reproducer:

```sh
timeout 2s /usr/lib/openssh/sshd-auth
```

Result:

```text
sshd-auth should not be executed directly
```

`git status --short` and `git diff --stat` were clean; no source changes were made.

## Review Pass 1

RESULT: ok

The first patch pass leaves no source changes, which matches the `inferred` evidence level and the saved no-patch plan. The author did not overstate the profiler/strace evidence, did not invent a reproducer, and explained why the trace looks like normal `sshd-auth` pre-auth flow rather than a confirmed busy-poll bug.

Validation is acceptable for a no-patch diagnosis: `./configure && make` was attempted from the workspace root and failed with the exact `configure.ac newer than configure` blocker, and a bounded independent `strace` reproduction attempt was reported as blocked by ptrace restrictions. The workspace is clean, so `Git Add Paths: None` is accurate.

## Plan Pass

## Problem
Fixer flagged `/usr/lib/openssh/sshd-auth` as a likely busy-poll runaway, but the collected evidence does not show a runaway loop. The process was sleeping, used at most `0.8%` CPU, blocked in `read(3)` for about `1.4s`, slept in the auth failure delay for about `1.86s`, performed one short `ppoll(5)`, then exited after `ECONNRESET`.

## Evidence Confidence
inferred

## Proposed Subject
No source patch: diagnose the report as insufficient/contradictory busy-poll evidence for `sshd-auth`.

## Patch Plan
Do not edit OpenSSH in this pass. The evidence points to normal pre-auth control flow: monitor IPC via `atomicio()`/`sshbuf`, auth failure delay via `auth2.c` `nanosleep()`, packet flush via `ssh_packet_write_wait()`/`ppoll()`, then `logdie("Connection reset by ...")`.

If later evidence shows repeated immediate `ppoll()` wakeups without progress in the same process, investigate `packet.c` around `ssh_packet_read_seqnr()` and `ssh_packet_write_wait()` using existing `ptimeout_*` helpers from `misc.c`. Avoid adding awkward control flow such as avoidable `goto`; follow OpenSSH conventions already present here: `fatal_f`/`fatal_fr`, `debug3_f`, `sshbuf_*`, `atomicio()`, and bounded poll timeout helpers.

No prior Fixer patch was found in the workspace that should be replaced.

## Risks
A patch based only on this bundle would likely change mature auth/packet behavior without evidence of a bug. The trace may represent a transient hostile or reset SSH connection rather than a CPU runaway. Changing auth delay, packet flushing, or monitor IPC could regress security timing behavior or privilege-separation communication.

## Validation
Before any focused check, try the project-level entrypoint from the workspace root:

```sh
./configure && make
```

If dependencies or generated files are missing, record the exact failing command and stderr reason.

Bounded independent check, if continuing investigation: build locally, run a temporary `sshd`/`sshd-auth` auth attempt under `timeout` plus `strace -f -tt -T -e trace=read,write,ppoll,nanosleep,clock_nanosleep`, then confirm whether there are repeated immediate `ppoll()` returns without blocking. Do not claim reproduction unless that command actually shows the repeated busy-poll signal.

## Patch Pass

Subject: no patch: sshd-auth sample is not a busy poll

## Commit Message
No source change is propos

[truncated]

Issue page: /issues/019e3654-a65e-7280-96ec-a71efe4a27f7. Issue JSON: /v1/issues/019e3654-a65e-7280-96ec-a71efe4a27f7

sshd-session is stuck in a likely unclassified userspace loop: 28.08% of sampled CPU passed through unmap_page_range, with repeated thread backtraces show 1 thread(s) around 0x00007f9d21c9a7d2 in ?? () from target:<path>.

## 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): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `openssh` 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. 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. 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.

Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `openssh` 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. 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 `openssh` 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): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, 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 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 `sshd-session` as a suspected runaway process, but the bundle does not identify an OpenSSH userspace loop. The sampled process is sleeping in `poll_schedule_timeout`/`restart_syscall`, `strace` captured only one syscall over 5 seconds, target CPU is reported around 0.1%, and the hot samples are kernel memory-management symbols such as `unmap_page_range`.

## Evidence Confidence
inferred

## Proposed Subject
No source patch: diagnose inconclusive `sshd-session` runaway evidence instead of changing OpenSSH event-loop code.

## Patch Plan
Do not edit files from the current evidence. The likely source area would be `serverloop.c` via `sshd-session.c`, but the inspected loop already uses OpenSSH’s local conventions: `ppoll`, `ptimeout_init`, `ptimeout_deadline_*`, `ptimeout_get_tsp`, `ssh_signal`, `fatal_f`/`fatal_fr`, `logit`, and `debug*`.

The prior Fixer pass for this same finding also produced a no-source-change diagnosis; that should be preserved rather than replaced by a speculative patch. A future patch should require extra evidence first: symbolized frames for the sampled binary, live fd targets, and longer `strace`/`perf` output proving repeated userspace activity or a specific mishandled poll event.

If later evidence implicates the server loop, keep the change bounded in `wait_until_can_do_something()`/`server_loop2()` and follow nearby control flow. Avoid avoidable `goto`; a small conditional/helper matching the current loop style is cleaner.

## Risks
Changing `serverloop.c`, `monitor.c`, or `packet.c` without a concrete fault could regress session liveness, signal wakeups, keepalives, or child reaping.

The evidence may point outside OpenSSH: the bundle names the kernel package, shows kernel hot symbols, and the process state is sleeping rather than running.

## Validation
Before any future patch, try the project-level entrypoint from the workspace root:

`./configure && make`

If it fails as the prior Fixer pass observed, record the exact blocker: `configure: error: ./configure.ac newer than configure, run autoreconf`, then run `autoreconf`, `./configure`, and the narrowest relevant compile such as `make serverloop.o sshd-session.o monitor.o packet.o` plus `make sshd-session`.

Bounded reproduction attempt: build the unmodified tree and, only if safe, run a local debug `sshd`/authenticated session while capturing short `strace` or `perf` data. Do not claim reproduction unless it shows the same runaway signal.

## Patch Pass

Subject: sshd-session: diagnose inconclusive CPU profile

## Commit Message
No source change is included. The collected signal most likely does not show an OpenSSH userspace runaway: the process was sleeping in `poll`/`restart_syscall`, `/proc` reported state `S`, `strace` saw only one syscall over 5 seconds, and the hot samples were kernel memory-management symbols such as `unmap_page_range`.

## Evidence Confidence
inferred

## Issue Connection
Fixer collected a suspected runaway-process profile for `sshd-session`, but the exact signal is indirect and contradictory: CPU samples mention kernel memory-management work while the sampled thread is blocked in the kernel poll path. The cautious inference is that this is not enough evidence for an upstream OpenSSH event-loop change.

I followed the plan and did not change course. I inspected the likely subsystem, `serverloop.c` via `sshd-session.c`; it already uses OpenSSH’s local helper and maintainer conventions, including `ppoll`, `ptimeout_*`, `ssh_signal`, `fatal_f`/`fatal_fr`, `logit`, and `debug*`. No relevant missing local helper or cleaner bounded control-flow fix was identified.

No patch was made. The expected effect is to avoid sending an unsupported source change for a profile that currently looks more like an inconclusive kernel/poll observation than a demonstrated OpenSSH bug.

## Git Add Paths
None

## Validation
Checked contribution/style docs: only `README.md` matched the requested doc names. It documents `./configure`, then `make && make tests`; git builds may need `autoreconf`.

Project-level validation from workspace root:
`./configure && make`
Failed before compilation with:
`configure: error: ./configure.ac newer than configure, run autoreconf`

Fallback validation in a temporary copy:
`autoreconf` succeeded, with obsolete `AC_TRY_COMPILE` warnings.
`./configure` succeeded.
`make serverloop.o sshd-session.o monitor.o packet.o sshd-session` succeeded.

Bounded reproduction attempt:
`timeout 5s strace -f -e trace=restart_syscall,poll,ppoll ./sshd-session`
Blocked by sandbox ptrace restrictions:
`PTRACE_TRACEME: Operation not permitted` and `ptrace(PTRACE_SEIZE, 54): Operation not permitted`.

Fallback smoke:
`timeout 5s ./sshd-session`
Exited immediately with `sshd-session should not be executed directly`, so it did not reproduce the collected long-lived poll/profile signal. The proposal workspace has no git changes.

## Review Pass 1

RESULT: ok

No source patch was left in the workspace, and `## Git Add Paths` correctly says `None`. The author’s `inferred` confidence matches the evidence: the bundle is profiler/trace evidence with a sleeping `sshd-session`, a single `restart_syscall`, kernel hot symbols, and no reproduced OpenSSH userspace loop.

The response satisfies the validation expectation: it attempted `./configure && make` from the workspace root, reported the exact blocker, then ran `autoreconf`, `./configure`, and a focused `sshd-session` compile/link in a temporary copy. It also attempted a bounded reproduction with `strace`, reported the ptrace blocker, and did not claim reproduction.

The upstream-style checks are also covered: `README.md` was identified as the relevant doc, and the likely `serverloop.c` subsystem was checked for OpenSSH conventions such as `ppoll`, `ptimeout_*`, `ssh_signal`, and `fatal_f`/`debug*`. No invented failure or speculative source diff was introduced.

## Plan Pass

## Problem
Fixer flagged `sshd-session` as a suspected runaway process, but the bundle does not identify an OpenSSH userspace loop. The sampled process is sleeping in `poll_schedule_timeout`/`restart_syscall`, `strace` captured only one syscall over 5 seconds, target CPU is reported around 0.1%, and the hot samples are kernel memory-management symbols such as `unmap_page_range`.

## Evidence Confidence
inferred

## Proposed Subject
No source patch: diagnose inconclusive `sshd-session` runaway evidence instead of changing OpenSSH event-loop code.

## Patch Plan
Do not edit files from the current evidence. The likely source area would be `serverloop.c` via `sshd-session.c`, but the inspected loop already uses OpenSSH’s local conventions: `ppoll`, `ptimeout_init`, `ptimeout_deadline_*`, `ptimeout_get_tsp`, `ssh_signal`, `fatal_f`/`fatal_fr`, `logit`, and `debug*`.

The prior Fixer pass for this same finding also produced a no-source-change diagnosis; that should be preserved rather than replaced by a speculative patch. A future patch should require extra evidence first: symbolized frames for the sampled binary, live fd targets, and longer `strace`/`perf` output proving repeated userspace activity or a specific mishandled poll event.

If later evidence implicates the server loop, keep the change bounded in `wait_until_can_do_something()`/`server_loop2()` and follow nearby control flow. Avoid avoidable `goto`; a small conditional/helper matching the current loop style is cleaner.

## Risks
Changing `serverloop.c`, `monitor.c`, or `packet.c` without a concrete fault could regress session liveness, signal wakeups, keepalives, or child reaping.

The evidence may point outside OpenSSH: the bundle names the kernel package, shows kernel hot symbols, and the process state is sleeping rather than running.

## Validation
Before any future patch, try the project-level entrypoint from the workspace root:

`./configure && make`

If it fails as the prior Fixer pass observed, record the exact blocker: `configure: error: ./configure.ac newer than configure, run autoreconf`, then run `autoreconf`, `./configure`, and the narrowest relevant compile such as `make serverloop.o sshd-session.o monitor.o packet.o` plus `make sshd-session`.

Bounded reproduction attempt: build the unmodified tree and, only if safe, run a local debug `sshd`/authenticated session while cap

[truncated]

Issue page: /issues/019dfce7-afc1-78f1-a6e6-9da07c302163. Issue JSON: /v1/issues/019dfce7-afc1-78f1-a6e6-9da07c302163

sshd-session is stuck in a likely unclassified userspace loop: 24.73% of sampled CPU passed through mas_wr_store_entry, with repeated thread backtraces show 1 thread(s) around 0x00007fdf0e29a7d2 in ?? () from target:<path>.

## 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): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `openssh` 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. 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. 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.

Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `openssh` 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. 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 `openssh` 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): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, 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 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 an `sshd-session` process with a low but flagged CPU profile: `total_cpu_percent`/`max_cpu_percent` was `0.4`, process state was sleeping, `strace` showed only `restart_syscall(<... resuming interrupted poll ...>)`, kernel stack was in `poll_schedule_timeout`, and the userspace backtrace reached OpenSSH code only below libc `poll()`. The hot symbols were kernel memory-management functions (`mas_wr_store_entry`, `mas_wr_store_type`, `__slab_free`), not named OpenSSH functions.

This does not yet identify an OpenSSH bug or a source-level loop. The relevant OpenSSH path is likely the normal server event loop in `serverloop.c:wait_until_can_do_something()`, but the evidence currently shows it blocked in `ppoll()`, not spinning.

## Evidence Confidence

inferred

## Proposed Subject

No source patch yet: diagnose `sshd-session` poll/profile signal before editing.

## Patch Plan

Do not edit OpenSSH in this pass. The evidence is indirect and does not support an upstream-ready code change.

Before any future patch, collect stronger evidence from a debug build and a bounded reproduction attempt:

1. Map the sampled stack against a locally built `sshd-session` with symbols.
2. Run an idle SSH session against the built server and sample the child `sshd-session` with `strace`, `/proc/$pid/wchan`, and a short CPU sampler.
3. Only patch if that shows a concrete OpenSSH loop, bad timeout calculation, repeated wakeup, or descriptor state issue.

If a real OpenSSH issue is found, keep the patch in the existing server-loop style: use `ptimeout_*`, `monotime()`, `debug_f`/`fatal_f`, `cleanup_exit()`, and OpenSSH `x*alloc` helpers where relevant. Avoid awkward control flow such as unnecessary `goto`; `wait_until_can_do_something()` already has a bounded linear structure that should be preserved.

No prior Fixer patch was found to improve or replace. Debian patches touch `sshd-session.c`/`serverloop.c` indirectly, especially `gssapi.patch`, but no local patch explains this profile.

## Risks

A speculative source change would likely be wrong: the process was sleeping in `poll`, CPU was only `0.4%`, and the dominant samples were kernel-side. Changing timeout or event-loop behavior could regress idle sessions, rekeying, `ClientAliveInterval`, `UnusedConnectionTimeout`, or SIGCHLD handling.

## Validation

If evidence later justifies a patch, first try the project entrypoint from the workspace root:

```sh
./configure && make
```

If that fails due to missing dependencies or generated files, record the exact failure and then run the narrowest relevant check, likely:

```sh
make serverloop.o
```

Bounded independent reproduction before editing:

```sh
./configure && make
regress/test-exec.sh
```

Then run a local idle SSH session against the built server and sample the resulting `sshd-session` briefly with `strace`/`wchan`/CPU sampling. I would not claim `reproduced` unless that command sequence shows an actual repeated wakeup or CPU loop.

## Patch Pass

Subject: diagnose sshd-session poll profile without patch

## Commit Message

No source change. The collected evidence points to an `sshd-session` blocked in the normal server event loop’s `ppoll()` wait, with hot samples in kernel memory-management code rather than in an OpenSSH userspace loop. That is not enough for an upstreamable OpenSSH patch.

## Evidence Confidence

inferred

## Issue Connection

Fixer collected a perf/strace/proc signal for `/usr/lib/openssh/sshd-session`: about `0.4%` CPU, process state `S (sleeping)`, `wchan` in `poll_schedule_timeout`, a single `restart_syscall(<... resuming interrupted poll ...>)` line over five seconds, and top perf symbols in the kernel such as `mas_wr_store_entry`.

The likely root cause is not an OpenSSH busy loop. The cautious inference from the evidence is that this was an idle or interrupted server session waiting in the normal `serverloop.c` event loop, below `wait_until_can_do_something()` and libc `poll`/`ppoll`. The raw artifact files referenced by the bundle were not present, so I could not map the sampled addresses to a stronger source-level cause.

I made no source change. This follows the saved plan in `plan-output.txt`: inferred profiler evidence should become a diagnosis/report unless stronger evidence identifies a concrete OpenSSH loop, timeout bug, descriptor-state bug, or repeated wakeup. The relevant local conventions I found were OpenSSH’s existing `ptimeout_*` timeout helpers, `monotime()`, `debug_f`/`fatal_f`, `cleanup_exit()`, and `x*alloc` allocation helpers; no new API use was introduced.

The expected effect is no behavior change and no speculative regression in `ClientAliveInterval`, `UnusedConnectionTimeout`, rekeying, channel polling, or SIGCHLD handling.

## Git Add Paths

None

## Validation

Project-level validation attempted from workspace root:

```sh
./configure && make
```

Result: failed before compilation with:

```text
configure: error: ./configure.ac newer than configure, run autoreconf
```

Focused fallback attempted:

```sh
make serverloop.o
```

Result: failed because configuration output was unavailable:

```text
includes.h:19:10: fatal error: config.h: No such file or directory
```

Bounded independent reproduction attempted:

```sh
pgrep -a sshd-session || true
```

Result: no current `sshd-session` process was available to sample with `strace`, `wchan`, or CPU counters. The raw investigation artifact paths in `evidence.json` were also missing on disk, so the failure signal was not independently reproduced.

## Review Pass 1

RESULT: ok

No blocking findings. The author left no source diff, which matches the `inferred` evidence level and the profiler-only signal. The response includes the required evidence classification, avoids inventing a reproducer or confirmed OpenSSH bug, names local OpenSSH helper conventions, and reports the required project-level validation attempt plus the focused fallback and reproduction blocker.

## Plan Pass

## Problem

Fixer observed an `sshd-session` process with a low but flagged CPU profile: `total_cpu_percent`/`max_cpu_percent` was `0.4`, process state was sleeping, `strace` showed only `restart_syscall(<... resuming interrupted poll ...>)`, kernel stack was in `poll_schedule_timeout`, and the userspace backtrace reached OpenSSH code only below libc `poll()`. The hot symbols were kernel memory-management functions (`mas_wr_store_entry`, `mas_wr_store_type`, `__slab_free`), not named OpenSSH functions.

This does not yet identify an OpenSSH bug or a source-level loop. The relevant OpenSSH path is likely the normal server event loop in `serverloop.c:wait_until_can_do_something()`, but the evidence currently shows it blocked in `ppoll()`, not spinning.

## Evidence Confidence

inferred

## Proposed Subject

No source patch yet: diagnose `sshd-session` poll/profile signal before editing.

## Patch Plan

Do not edit OpenSSH in this pass. The evidence is indirect and does not support an upstream-ready code change.

Before any future patch, collect stronger evidence from a debug build and a bounded reproduction attempt:

1. Map the sampled stack against a locally built `sshd-session` with symbols.
2. Run an idle SSH session against the built server and sample the child `sshd-session` with `strace`, `/proc/$pid/wchan`, and a short CPU sampler.
3. Only patch if that shows a concrete OpenSSH loop, bad timeout calculation, repeated wakeup, or descriptor state issue.

If a real OpenSSH issue is found, keep the patch in the existing server-loop style: use `ptimeout_*`, `monotime()`, `debug_f`/`fatal_f`, `cleanup_exit()`, and OpenSSH `x*alloc` helpers where relevant. Avoid awkward control flow such as unnecessary `goto`; `wait_until_can_do_something()` already has a bounded linear structure that should be preserved.

No prior Fixer patch was found to improve or replace. Debian patches touch `sshd-session.c`/`serverloop.c` indirectly, especially `gssapi.patch`, but no local patch explains this profile.

## Risks

A speculative source change would likely be wrong: the process was sleeping in `poll`, CPU was only `0.4%`, and the dominant samples were kernel-side. Changing timeout or event-loop behavior could regress idle sessions, rekeying, `ClientAliveInterval`, `UnusedConnectionTimeout`, or SIGCHLD handling.

## Validation

If evidence later justifies a patc

[truncated]

Issue page: /issues/019e2cf2-4191-7401-8886-c36147068535. Issue JSON: /v1/issues/019e2cf2-4191-7401-8886-c36147068535

sshd-auth is stuck in a likely timer churn loop: 100.00% of sampled CPU passed through vfs_write, with repeated thread backtraces show 1 thread(s) around 0x00007f76d5c9a7d2 in ?? () from target:<path>.

## 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): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `openssh` 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. 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. 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.

Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `openssh` 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. 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. The workspace currently changes these repo-relative paths: auth2.c. Verify that `## Git Add Paths` matches this exact set and that `## Issue Connection` explains every shipped functional file.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `openssh` 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): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, 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 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.

## Refinement Pass 1

You are refining a fixer patch after an explicit code review.

Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Read the latest author response at `./patch-output.txt`. Read the review report at `./review-1-output.txt`. This is refinement round 1. The original pre-edit snapshot is available at `./source` if you need to compare the current patch against it. Re-read the planning pass at `./plan-output.txt` before editing. The workspace currently changes these repo-relative paths: auth2.c. Either keep that exact set synchronized with `## Git Add Paths` and `## Issue Connection`, or revert any unintended file before you answer.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `openssh` 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): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout. Address the review findings with the smallest reasonable follow-up changes. If the review identifies a runtime or correctness bug in the changed code, you must update the code itself before answering; a metadata-only response is not sufficient. Keep the patch upstream-friendly, use local project helpers and compat APIs when available, avoid awkward control flow when a simpler structure will do, keep the final response gittable, make the maintainer-facing explana

[truncated 6525 bytes]

## Plan Pass

## Problem

Fixer observed `sshd-auth: root [net]` in a timer-heavy failed-authentication path: strace shows reads, `clock_nanosleep`, then writes consistent with sending an auth failure. The matching source is `auth2.c`: `input_userauth_request()` calls `ensure_minimum_time_since()` before `userauth_finish()` emits `SSH2_MSG_USERAUTH_FAILURE`.

## Evidence Confidence

observed

## Proposed Subject

`auth2: cap scaled userauth failure delay`

## Patch Plan

Update only `auth2.c:ensure_minimum_time_since()` so the exponential “scale up” fallback cannot push total failed-auth handling time beyond `MAX_FAIL_DELAY_SECONDS`.

Use the existing OpenSSH conventions found nearby: `monotime_double()` for elapsed time, `debug3_f()` for trace logging, direct `nanosleep()` for this delay path, and existing fatal/logging style. No relevant local wrapper replaces this direct sleep path; nearby IO uses `ssh_packet_write_wait()` and monitor/file IO uses `atomicio()`.

Improve on prior Fixer proposal `90090`, which made the same bounded-delay change but had generated regression artifacts during validation. The patch should keep the final diff scoped to `auth2.c` and avoid awkward control flow such as a `goto`; a bounded loop plus clamp is cleaner.

## Risks

This delay is timing-resistance code, so the patch must preserve the per-user minimum delay and only cap oversized scaled buckets.

The evidence is not an independent reproduction of a CPU runaway. The raw investigation files referenced in `evidence.json` are unavailable here, and the sampled process was sleeping with low CPU. The final patch should describe this as a targeted mitigation for Fixer-observed timer sleep, not a confirmed reproduced runaway fix.

## Validation

First try from the workspace root:

```sh
./configure && make
```

Then run focused checks:

```sh
git diff --check
make tests LTESTS=password
```

For a bounded independent reproduction attempt, run a local failed password-auth attempt under syscall tracing against the built test `sshd`, then compare whether `clock_nanosleep` duration remains bounded by `MAX_FAIL_DELAY_SECONDS`. If local test sshd setup fails due privileges, PAM, or `/var/empty`, report the exact command and failure, then run the narrow reproducible compile:

```sh
make auth2.o
```

## Patch Pass

Subject: auth2: cap scaled userauth failure delay

## Commit Message
Bound the scaled user authentication failure delay so it cannot extend past `MAX_FAIL_DELAY_SECONDS`.

OpenSSH adds a small per-user delay before sending an authentication failure to reduce timing differences. If authentication work had already exceeded the requested delay, the old code doubled the delay target until it exceeded elapsed time, but did not cap the scaled target before sleeping. Clamp that scaled target to the existing maximum and skip zero or negative sleeps.

## Evidence Confidence
observed

## Issue Connection
Fixer observed this failure signal directly but I did not independently reproduce it: `sshd-auth: root [net]` was sampled in `clock_nanosleep`, with strace showing `read -> read -> clock_nanosleep` followed by writes, and `/proc` showing the process sleeping.

The matching code path is `auth2.c` failed user authentication handling. `ensure_minimum_time_since()` pads failed authentication responses, but its scale-up path could choose a target above the local maximum when elapsed authentication work had already passed the initial per-user delay.

This patch keeps the existing timing padding, but clamps the scaled target to `MAX_FAIL_DELAY_SECONDS` before calculating the remaining sleep. The expected effect is that failed authentication still gets delayed, but `sshd-auth` will not add an oversized sleep beyond the intended cap before sending the failure response.

I followed the stored plan. Local conventions checked: `README.md`; nearby code uses `monotime_double()`, `debug3_f()`, direct `nanosleep()`, `ssh_packet_write_wait()`, `atomicio()`, `xmalloc()`, and `freezero()`. No relevant local helper replaces this direct sleep path.

## Git Add Paths
auth2.c

## Validation
`./configure && make` from the workspace root failed before building: `configure: error: ./configure.ac newer than configure, run autoreconf`.

`make auth2.o` from the workspace root also failed because configure had not produced `config.h`: `includes.h:19:10: fatal error: config.h: No such file or directory`.

To avoid generated-file churn in the final workspace, I copied the patched tree to `/tmp/openssh-90292-build.aYZw7k` and ran `autoreconf && ./configure && make`; it passed.

`make tests LTESTS=password` in that temporary build was the bounded reproduction/smoke attempt. It did not reproduce the observed sleep signal; it failed during test sshd setup with `Unsupported option UsePAM`, `Missing privilege separation directory: /var/empty`, and `FATAL: sshd_proxy broken`.

`git diff --check` passed.

## Review Pass 1

RESULT: fix-needed

## Findings

1. `auth2.c:253-265` does not clearly address the collected signal. The evidence shows `clock_nanosleep` durations around 1.84s and 1.88s, both below `MAX_FAIL_DELAY_SECONDS` 5.0. The patch only prevents the scaled delay target from exceeding the 5s cap, so the current `## Issue Connection` does not explain how this would change the observed behavior. Either gather stronger evidence that the observed `sshd-auth` path can exceed the cap, or reframe this as a no-patch diagnosis/issue report rather than shipping a source patch.

2. The patch includes unrelated EOF whitespace churn in `auth2.c` (`diff` shows a final blank line removed). Keep the diff strictly scoped to `ensure_minimum_time_since()` so the shipped file contains only the functional change.

`## Git Add Paths` correctly lists the only changed repo path, `auth2.c`, and the author did attempt the project-level `./configure && make` before falling back to a regenerated temporary build.

## Refinement Pass 1

Subject: diagnosis: sshd-auth timer sample needs stronger evidence

## Commit Message
No source patch is shipped.

The previous `auth2.c` change capped a failed-authentication delay at `MAX_FAIL_DELAY_SECONDS`, but the collected trace only showed `clock_nanosleep` calls around 1.8 seconds. That does not demonstrate an over-cap delay or a code-level bug in `ensure_minimum_time_since()`. The unsupported source diff has been removed.

## Evidence Confidence
inferred

## Issue Connection
Fixer collected a direct runtime signal from `sshd-auth: root [net]`: backtraces sampled the process in `clock_nanosleep`, strace showed `read -> read -> clock_nanosleep` followed by writes, and `/proc` showed the process sleeping with low CPU.

The likely source area is still failed user authentication timing in `auth2.c`, where OpenSSH pads authentication failure responses to reduce timing differences. However, the observed sleep durations in the evidence are below the existing 5 second maximum, so the prior cap change did not causally explain the collected signal.

I removed the `auth2.c` patch and left no source diff. The expected effect is that we avoid sending an upstream patch whose behavior is not supported by the available evidence; the right next step is a better trace with symbols or a local reproduction showing a concrete bad delay pattern.

Review findings addressed: the unsupported cap change was reverted, and the unrelated EOF whitespace churn was removed. Local conventions checked: `README.md`; nearby auth code uses `monotime_double()`, `debug3_f()`, direct `nanosleep()`, `ssh_packet_write_wait()`, `atomicio()`, `xmalloc()`, and `freezero()`. No relevant local helper was found that changes this no-patch diagnosis.

## Git Add Paths
None

## Validation
`./configure && make` from the workspace root was attempted and failed before building: `configure: error: ./configure.ac newer than configure, run autoreconf`.

`git status --short` produced no output; the workspace has no remaining source changes.

`git diff --check` passed.

No independent reproduction was completed in this refinement because the source patch was removed after review showed the evidence did not support it.

## Review Pass 2

RESULT: ok

No source changes remain in the workspace, and `## Git Add Paths` correctly says `None`. The refined response downgrades confidence to `inferred`, avoids shipping the unsupported `auth2.c` change, and explains why the observed sub-5s `clock_nanosleep` samples do not justify the prior cap patch.

Validation is acceptable for a no-patch diagnosis: the project-level `./configure && make` was attempted and the exact blocker was reported, and the workspace was confirmed clean with `git status --short` plus `git diff --check`.

## Plan Pass

## Problem

Fixer observed `sshd-auth: root [net]` in a timer-heavy failed-authentication path: strace shows reads, `clock_nanosleep`, then writes consistent with sending an auth failure. The matching source is `auth2.c`: `input_userauth_request()` calls `ensure_minimum_time_since()` before `userauth_finish()` emits `SSH2_MSG_USERAUTH_FAILURE`.

## Evidence Confidence

observed

## Proposed Subject

`auth2: cap scaled userauth failure delay`

## Patch Plan

Update only `auth2.c:ensure_minimum_time_since()` so the exponential “scale up” fallback cannot push total failed-auth handling time beyond `MAX_FAIL_DELAY_SECONDS`.

Use the existing OpenSSH conventions found nearby: `monotime_double()` for elapsed time, `debug3_f()` for trace logging, direct `nanosleep()` for this delay path, and existing fatal/logging style. No relevant local wrapper replaces this direct sleep path; nearby IO uses `ssh_packet_write_wait()` and monitor/file IO uses `atomicio()`.

Improve on prior Fixer proposal `90090`, which made the same bounded-delay change but had generated regression artifacts during validation. The patch should keep the final diff scoped to `auth2.c` and avoid awkward control flow such as a `goto`; a bounded loop plus clamp is cleaner.

## Risks

This delay is timing-resistance code, so the patch must preserve the per-user minimum delay and only cap oversized scaled buckets.

The evidence is not an independent reproduction of a CPU runaway. The raw investigation files referenced in `evidence.json` are unavailable here, and the sampled process was sleeping with low CPU. The final patch should describe this as a targeted mitigation for Fixer-observed timer sleep, not a confirmed reproduced runaway fix.

## Validation

First try from the workspace root:

```sh
./configure && make
```

Then run focused checks:

```sh
git diff --check
make tests LTESTS=password
```

For a bounded independent reproduction attempt, run a local failed password-auth attempt under syscall tracing against the built test `sshd`, then compare whether `clock_nanosleep` duration remains bounded by `MAX_FAIL_DELAY_SECONDS`. If local test sshd setup fails due privileges, PAM, or `/var/empty`, report the exact command and failure, then run the narrow reproducible compile:

```sh
make auth2.o
```

## Patch Pass

Subject: auth2: cap scaled userauth failure delay

## Commit Message
B

[truncated]

Issue page: /issues/019e2c59-6707-7471-b7b2-5329d3cdd34e. Issue JSON: /v1/issues/019e2c59-6707-7471-b7b2-5329d3cdd34e

sshd-session is stuck in a likely unclassified userspace loop: 17.74% of sampled CPU passed through __vma_start_write, with repeated thread backtraces show 1 thread(s) around 0x00007f0dbde9a7d2 in ?? () from target:<path>.

## 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): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `openssh` 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. 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. 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.

Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `openssh` 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. 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 `openssh` 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): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, 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 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 `sshd-session` as a runaway process, but the embedded evidence shows a single-threaded process sleeping in `poll_schedule_timeout`, one `restart_syscall(<... resuming interrupted poll ...>)` over 5 seconds, and only 0.1% total CPU for three processes. The hot samples are kernel symbols, not symbolized OpenSSH frames. The raw artifact paths referenced in `evidence.json` are not present, so there is not enough evidence to identify an OpenSSH source bug.

## Evidence Confidence
inferred

## Proposed Subject
No source patch: diagnose `sshd-session` poll sleep evidence as insufficient for an upstream OpenSSH CPU-loop fix.

## Patch Plan
Do not edit files in this pass. A source patch would be speculative because the collected signal points at a sleeping `ppoll`/`poll` wait, not a confirmed busy loop.

If stronger evidence is collected later, start from `serverloop.c:wait_until_can_do_something()` and nearby `channels.c` timeout handling, following OpenSSH/OpenBSD style. Use the existing `ptimeout_*` helpers, `monotime()`, `channel_prepare_poll()`, `channel_after_poll()`, `ssh_packet_*` helpers, and existing `fatal_f`/`logit` conventions rather than adding ad hoc time or polling logic. Avoid awkward control flow such as avoidable `goto`; the current loop is structured enough for bounded conditionals.

No prior Fixer source patch was found in the workspace to improve or replace.

## Risks
Treating this as a confirmed OpenSSH bug risks adding a timeout or wakeup change that alters long-lived SSH sessions without fixing the observed signal. The evidence may instead reflect normal idle session behavior, a profiling attribution artifact, a kernel-side issue, or missing symbolization.

## Validation
Before any future source patch, try the project-level entrypoint from the workspace root: `./configure && make`.

For a bounded independent check, build with symbols and run a controlled idle SSH session/regression such as `make tests LTESTS=connection-timeout`, then capture a short `strace`/stack sample of the resulting `sshd-session` to see whether it is merely blocked in `ppoll` or actually spinning. If `./configure && make` fails due to missing dependencies or generated files, report that exact command and failure, then fall back to the narrowest reproducible build/test around `serverloop.c` and `regress/connection-timeout.sh`.

## Patch Pass

Subject: no patch: sshd-session sample is blocked in poll

## Commit Message
No source change is proposed. The collected signal does not identify an OpenSSH CPU loop: the sampled `sshd-session` was sleeping in the kernel poll wait path, with only an interrupted `poll` syscall visible and no symbolized OpenSSH hot frame.

## Evidence Confidence
inferred

## Issue Connection
Fixer reported a runaway `sshd-session`, but the evidence shows `State: S (sleeping)`, `wchan: poll_schedule_timeout.constprop.0`, one `restart_syscall(<... resuming interrupted poll ...>)` line over 5 seconds, and only 0.1% total CPU across three `sshd-session` processes. The perf hot symbols are kernel symbols such as `__vma_start_write`, not OpenSSH functions.

The likely root cause is a misclassified idle or interrupted poll wait, or a kernel/profiling attribution artifact, not a confirmed userspace loop in OpenSSH. The relevant OpenSSH path is `serverloop.c:wait_until_can_do_something()`, which already uses the local `ptimeout_*` helpers, `monotime()`, `channel_prepare_poll()`, `channel_after_poll()`, `ssh_packet_*`, and signal-mask-aware `ppoll()` conventions.

I followed the saved plan and made no source change. The expected effect is no behavioral change and no speculative upstream patch based on indirect evidence. The raw investigation files referenced by `evidence.json` were not present, so there was no stronger trace to connect to a concrete source defect.

## Git Add Paths
None

## Validation
Tried the project-level entrypoint from the workspace root:

`./configure && make`

Result: failed immediately with `configure: error: ./configure.ac newer than configure, run autoreconf`.

Narrow focused validation in a temporary copy, keeping the workspace clean:

`autoreconf && ./configure && make serverloop.o sshd-session`

Result: passed; `serverloop.o` compiled and `sshd-session` linked.

Bounded independent check attempted:

`make tests LTESTS=connection-timeout`

Result: blocked by the test environment after file tests passed. The regression driver reported unsafe `/tmp` permissions, `Unsupported option UsePAM` because the temporary configure lacked PAM support, and `Missing privilege separation directory: /var/empty`. This did not reproduce the reported runaway signal. Git status in the workspace remained clean.

## Review Pass 1

RESULT: ok

No source changes were left in the workspace, which is appropriate for the indirect evidence. The author output keeps `## Evidence Confidence` at `inferred`, avoids claiming a reproduced OpenSSH bug, names the relevant local helpers/conventions (`ptimeout_*`, `monotime()`, `channel_prepare_poll()`, `channel_after_poll()`, `ssh_packet_*`, `ppoll()`), and reports the project-level validation failure with the exact blocker.

The follow-up focused build and attempted `connection-timeout` regression are clearly described, including why the regression could not run. This is acceptable as a no-patch upstream diagnosis.

## Plan Pass

## Problem
Fixer flagged `sshd-session` as a runaway process, but the embedded evidence shows a single-threaded process sleeping in `poll_schedule_timeout`, one `restart_syscall(<... resuming interrupted poll ...>)` over 5 seconds, and only 0.1% total CPU for three processes. The hot samples are kernel symbols, not symbolized OpenSSH frames. The raw artifact paths referenced in `evidence.json` are not present, so there is not enough evidence to identify an OpenSSH source bug.

## Evidence Confidence
inferred

## Proposed Subject
No source patch: diagnose `sshd-session` poll sleep evidence as insufficient for an upstream OpenSSH CPU-loop fix.

## Patch Plan
Do not edit files in this pass. A source patch would be speculative because the collected signal points at a sleeping `ppoll`/`poll` wait, not a confirmed busy loop.

If stronger evidence is collected later, start from `serverloop.c:wait_until_can_do_something()` and nearby `channels.c` timeout handling, following OpenSSH/OpenBSD style. Use the existing `ptimeout_*` helpers, `monotime()`, `channel_prepare_poll()`, `channel_after_poll()`, `ssh_packet_*` helpers, and existing `fatal_f`/`logit` conventions rather than adding ad hoc time or polling logic. Avoid awkward control flow such as avoidable `goto`; the current loop is structured enough for bounded conditionals.

No prior Fixer source patch was found in the workspace to improve or replace.

## Risks
Treating this as a confirmed OpenSSH bug risks adding a timeout or wakeup change that alters long-lived SSH sessions without fixing the observed signal. The evidence may instead reflect normal idle session behavior, a profiling attribution artifact, a kernel-side issue, or missing symbolization.

## Validation
Before any future source patch, try the project-level entrypoint from the workspace root: `./configure && make`.

For a bounded independent check, build with symbols and run a controlled idle SSH session/regression such as `make tests LTESTS=connection-timeout`, then capture a short `strace`/stack sample of the resulting `sshd-session` to see whether it is merely blocked in `ppoll` or actually spinning. If `./configure && make` fails due to missing dependencies or generated files, report that exact command and failure, then fall back to the narrowest reproducible build/test around `serverloop.c` and `regress/connection-timeout.sh`.

## P

[truncated]

Issue page: /issues/019e2aa0-b495-7700-93f0-5ded04669259. Issue JSON: /v1/issues/019e2aa0-b495-7700-93f0-5ded04669259

dockerd is stuck in a likely socket churn loop: 10.98% of sampled CPU passed through futex_wake_mark, with repeated thread backtraces show 1 thread(s) around 0x000056124fea7023 in ?? () and 1 thread(s) around 0x000056124fea7023 in ?? ().

## 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.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `docker.io` 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. 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. 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.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `docker.io` 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. 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 `docker.io` upstream patch, not just a Debian-local workaround. 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 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 `dockerd` running as `/usr/sbin/dockerd -H fd:// --containerd=/run/containerd/containerd.sock` with low CPU, many sleeping threads, futex waits, and an automated `socket-churn` classification. The available raw artifact paths are not present, so the usable evidence is limited to excerpts in `evidence.json`. I did not find a concrete user-visible failure, crash, or reproducible loop in the bundle.

## Evidence Confidence
inferred

## Proposed Subject
No source patch yet: require symbolized dockerd evidence or a bounded reproduction before changing Moby daemon code.

## Patch Plan
Do not edit in this pass and do not present a speculative source change as a confirmed bug fix. The current evidence shows `process_state: S (sleeping)`, `total_cpu_percent: 0.1`, `hot_path_symbol: futex_wake_mark`, many `FUTEX_WAIT_PRIVATE` lines, and only a classifier-level `socket-churn` signal. That is not enough to tie a maintainer-facing patch to a specific Moby defect.

Investigation should start from dockerd entrypoints and local helpers already inspected:

- `engine/cmd/dockerd/docker.go` and `engine/cmd/dockerd/daemon.go` for daemon startup.
- `engine/daemon/listeners/listeners_linux.go` for `fd://`, which correctly uses `github.com/coreos/go-systemd/v22/activation`, `sockets.New*`, `homedir.StickRuntimeDirContents`, and `log.G`.
- `engine/libcontainerd/supervisor/remote_daemon.go` for containerd process spawning and wait handling, which uses local `pkg/pidfile`, `pkg/process`, `log.G`, and context/timer conventions.

The first edit-eligible step would be to collect extra evidence: symbolized goroutine stacks or a reproducer showing repeated listener/containerd reconnect work. If that points to a bounded code path, patch there using existing Moby conventions: `errors.Wrap*`, `log.G(ctx)`, context-aware timers, local `pkg/process`/`pidfile` helpers, and `gofmt -s`. Avoid awkward control flow such as adding avoidable `goto`; use small helper functions or bounded loops.

No prior Fixer patch was found in the workspace or Debian patch stack, so there is nothing related to replace or improve.

## Risks
A patch from the current bundle would risk fixing the wrong layer. The futex-heavy trace may simply be normal Go goroutine parking, and the missing raw artifacts prevent validating the classifier’s socket-churn conclusion. Runtime investigation should stay secondary unless symbolized evidence proves a Go runtime futex issue.

## Validation
Primary workspace-root entrypoint to try before focused checks: `dpkg-buildpackage -us -uc -b`, because Debian’s `debian/rules` builds `dockerd` and runs the packaged smoke/unit tests.

Focused checks after evidence identifies a target: `cd engine && TESTDIRS='<target package>' TESTFLAGS='-test.run <target test>' make test-unit`.

Bounded independent reproduction attempt: run a short socket-activation startup test around existing `engine/cmd/dockerd` listener coverage, such as `cd engine && TESTDIRS=github.com/docker/docker/cmd/dockerd TESTFLAGS='-test.run ^TestLoadListenerNoAddr$' make test-unit`, and only claim reproduction if it shows the collected failure signal rather than merely passing existing behavior.

## Patch Pass

Subject: No patch: require stronger dockerd profile evidence

## Commit Message
No source change was made. The collected data points to a sleeping Go daemon with many goroutines parked in futex waits, not to a confirmed Moby code defect. A futex is the Linux primitive Go uses for blocking and waking goroutines, so a futex-heavy profile needs symbolized goroutine stacks or a reproducer before it can support an upstream patch.

## Evidence Confidence
inferred

## Issue Connection
The collected signal is a `dockerd` process started as `/usr/sbin/dockerd -H fd:// --containerd=/run/containerd/containerd.sock`, classified by Fixer as `socket-churn` with confidence `0.72`. The `/proc` excerpts show the process was sleeping, using only `0.1%` total CPU, with mostly voluntary context switches. The strace excerpt shows many `FUTEX_WAIT_PRIVATE` calls and a few `waitid(P_PIDFD, ...)` waits; the kernel stack is also futex wait code.

The likely root cause from the available perf, strace, and `/proc` evidence is normal or at least unspecific Go runtime blocking, not a demonstrated daemon socket retry loop. The raw strace, file descriptor, and gdb files referenced by the bundle are missing from disk, and the backtraces are unsymbolized, so there is no safe line from the evidence to a specific Moby source change.

I followed the saved plan and did not leave a source diff. I inspected the relevant upstream conventions and helpers: `engine/CONTRIBUTING.md` requires focused tests and `gofmt`; `engine/TESTING.md` documents `make test-unit`; `engine/daemon/listeners/listeners_linux.go` already uses `activation.Listeners`/`TLSListeners`, `sockets.New*`, `homedir.StickRuntimeDirContents`, and `log.G`; `engine/libcontainerd/supervisor/remote_daemon.go` uses local `pidfile`, `process`, `log.G`, and context/timer patterns. No new API was introduced.

The expected effect of this no-patch result is to avoid submitting a speculative upstream change. A pull-request-ready patch would need stronger evidence, such as symbolized goroutine stacks or a bounded reproduction showing repeated listener or containerd reconnect work.

## Git Add Paths
None

## Validation
Workspace-root validation attempted:

`dpkg-buildpackage -us -uc -b`

Result: blocked before build by `dpkg-checkbuilddeps: error: unmet build dependencies`, including `dh-golang`, `golang-any`, `go-md2man`, `golang-github-coreos-go-systemd-dev`, `golang-github-containerd-containerd-dev`, and many other Go development packages.

Independent bounded reproduction attempted:

`cd engine && TESTDIRS=github.com/docker/docker/cmd/dockerd TESTFLAGS='-test.run ^TestLoadListenerNoAddr$' make test-unit`

Result: blocked by the containerized Moby test harness: `ERROR: mkdir /root/.docker: read-only file system`, after `docker buildx build ... --target=dev-base`.

Narrow fallback attempted:

`cd engine && go test ./cmd/dockerd -run '^TestLoadListenerNoAddr$' -count=1`

Result: blocked by local module/dependency setup: `cannot find module providing package ... import lookup disabled by -mod=readonly`, plus `GOCACHE is not defined and neither $XDG_CACHE_HOME nor $HOME are defined`.

Evidence artifact check:

The referenced raw files `strace.log`, `gdb-bt.txt`, and `fd-targets.txt` under `/var/lib/fixer/investigations/...` are missing, so I could not independently reproduce or strengthen the collected failure signal.

## Review Pass 1

RESULT: ok

The first pass correctly leaves no source diff because the evidence is profiler/strace-only and indirect. It uses `## Evidence Confidence` with the valid value `inferred`, does not claim local reproduction, and explains why the futex-heavy sleeping `dockerd` trace is not enough to identify a Moby source bug.

Validation is acceptable for a no-patch diagnosis: it attempted the workspace-root `dpkg-buildpackage -us -uc -b`, reported the dependency blocker, then tried the bounded listener test and a narrower `go test` fallback with their blockers. The response also names relevant Moby docs and local helper conventions (`activation.*`, `sockets.New*`, `homedir.StickRuntimeDirContents`, `log.G`, `pidfile`, `process`) and does not introduce generic APIs or speculative code.

## Plan Pass

## Problem
Fixer observed `dockerd` running as `/usr/sbin/dockerd -H fd:// --containerd=/run/containerd/containerd.sock` with low CPU, many sleeping threads, futex waits, and an automated `socket-churn` classification. The available raw artifact paths are not present, so the usable evidence is limited to excerpts in `evidence.json`. I did not find a concrete user-visible failure, crash, or reproducible loop in the bundle.

## Evidence Confidence
inferred

## Proposed Subject
No source patch yet: require symbolized dockerd evidence or a bounded reproduction before changing Moby daemon code.

## Patch Plan
Do not edit in this pass and do not present a speculative source change as a confirmed bug fix. The current evidence shows `process_state: S (sleeping)`, `total_cpu_percent: 0.1`, `hot_path_symbol: futex_wake_mark`, many `FUTEX_WAIT_PRIVATE` lines, and only a classifier-level `socket-churn` signal. That is not enough to tie a maintainer-facing patch to a specific Moby defect.

Investigation should start from dockerd entrypoints and local helpers already inspected:

- `engine/cmd/dockerd/docker.go` and `engine/cmd/dockerd/daemon.go` for daemon startup.
- `engine/daemon/listeners/listeners_linux.go` for `fd://`, which correctly uses `github.com/coreos/go-systemd/v22/activation`, `sockets.New*`, `homedir.StickRuntimeDirContents`, and `log.G`.
- `engine/libcontainerd/supervisor/remote_daemon.go` for containerd process spawning and wait handling, which uses local `pkg/pidfile`, `pkg/process`, `log.G`, and context/timer conventions.

The first edit-eligible step would be to collect extra evidence: symbolized goroutine stacks or a reproducer showing repeated listener/containerd reconnect work. If that points to a bounded code path, patch there using existing Moby conventions: `errors.Wrap*`, `log.G(ctx)`, context-aware timers, local `pkg/process`/`pidfile` helpers, and `gofmt -s`. Avoid awkward control flow such as adding avoidable `goto`; use small helper functions or bounded loops.

No prior Fixer patch was found in the workspace or Debian patch stack, so there is nothing related to replace or improve.

## Risks
A patch from the current bundle would risk fixing the wrong layer. The futex-heavy trace may simply be normal Go goroutine parking, and the missing raw artifacts prevent validating the classifier’s socket-churn conclusion. Runtime investig

[truncated]

Issue page: /issues/019dfdca-f6d4-72a1-be1c-18d5922e0bde. Issue JSON: /v1/issues/019dfdca-f6d4-72a1-be1c-18d5922e0bde

sshd-session is stuck in a likely unclassified userspace loop: 100.00% of sampled CPU passed through validate_xmit_skb, with repeated thread backtraces show 1 thread(s) around 0x00007f18a6e9a7d2 in ?? () from target:<path>.

## 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): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `openssh` 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. 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. 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.

Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `openssh` 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. 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 `openssh` 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): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, 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 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 `sshd-session` associated with a “runaway CPU” investigation, but the captured process was sleeping in `poll`/`restart_syscall`, with `wchan=poll_schedule_timeout.constprop.0`, one strace line over 5s, and only 1.4% total CPU. The hot symbol was kernel-side `validate_xmit_skb`, not OpenSSH userspace. This does not currently support an upstream OpenSSH source patch.

## Evidence Confidence
inferred

## Proposed Subject
No source patch: diagnose likely external/kernel/network attribution for `sshd-session` poll sleep

## Patch Plan
Do not edit OpenSSH for this evidence as-is. The entrypoint is `sshd-session`; the relevant post-auth loop is `server_loop2()` in `serverloop.c`, which delegates poll setup to `channel_prepare_poll()` and timeout handling to the local `ptimeout_*` helpers in `misc.c`.

Local conventions/helpers found: `ppoll()` with `ptimeout_init()`, `ptimeout_deadline_*()`, `monotime()`, `fatal_f()`/`logit()`, `xrecallocarray()`, and channel `io_want`/`io_ready` bookkeeping. Only `README.md` was found among contribution/style docs; no `CONTRIBUTING`, `HACKING`, `docs/`, or `dev-docs/` were present.

A suspicious `channels.c` socket poll assignment exists (`pfd[p].events = 0` in the separate `c->sock` case), but nearby construction usually makes `c->sock == c->rfd` for listener/connecting sockets, so the evidence does not prove this path caused the observed process state. I would not present that as a fix without a reproducer that shows a missed socket event. No prior Fixer patch is present in the workspace to replace or improve.

## Risks
A source patch here would risk solving a speculative userspace bug while the actual signal points to kernel transmit work or normal idle polling. Adding watchdogs, forced sleeps, or `goto`-based loop escapes in `serverloop.c` would be awkward and upstream-hostile without proof of a userspace spin.

## Validation
Before any future focused check, try the project entrypoint from the workspace root:

`./configure && make`

If dependencies or generated files are missing, report the exact failing command and reason. For a bounded independent check, after a successful build run the forwarding-focused regression path, e.g. `make t-exec LTESTS=forwarding`, and inspect whether it leaves an `sshd-session` CPU-hot while stuck in `poll`. Only if that reproduces a userspace-side missed event should a narrow `channels.c` patch and focused regression be planned.

## Patch Pass

Subject: openssh: diagnose sshd-session poll-sleep sample

## Commit Message
No source change. The collected evidence shows `sshd-session` sleeping in `poll(2)` while samples were attributed to the kernel networking transmit path, so there is not enough evidence for an upstream OpenSSH userspace fix.

## Evidence Confidence
inferred

## Issue Connection
The collected signal was a `sshd-session` process reported as CPU-hot, but `/proc` showed `State: S (sleeping)` and `wchan=poll_schedule_timeout.constprop.0`; strace captured only `restart_syscall(<... resuming interrupted poll ...>)`; and perf attributed the hot path to kernel `validate_xmit_skb`.

The cautious inference is that this was kernel/networking activity or profiler attribution around an idle `poll(2)`, not a demonstrated OpenSSH event-loop spin. I followed the saved plan and did not leave a source diff. The relevant OpenSSH loop already uses local conventions: `server_loop2()`, `ppoll()`, `ptimeout_*()` helpers, `monotime()`, `fatal_f()`/`logit()`, `xrecallocarray()`, and channel `io_want`/`io_ready` bookkeeping.

Only `README.md` was found among the requested contribution/style docs; no `CONTRIBUTING`, `HACKING`, `README-hacking`, `docs/`, or `dev-docs/` were present. The expected effect is no behavioral change: this avoids an upstream-hostile patch for an indirect profiler signal that does not identify a source-level OpenSSH bug.

## Git Add Paths
None

## Validation
`./configure && make` failed before compilation:

`configure: error: ./configure.ac newer than configure, run autoreconf`

Focused compile attempt:

`make channels.o` failed because the tree is not configured and `config.h` is absent:

`includes.h:19:10: fatal error: config.h: No such file or directory`

Bounded reproduction attempt:

`ps -p 2378835,2378864 -o pid=,stat=,pcpu=,wchan=,comm= || true` produced no live sampled processes, and `pgrep -a sshd-session || true` found no local `sshd-session` process to sample. The raw investigation artifact directory referenced by `evidence.json` was also not present in this environment, so I could not independently reproduce or re-sample the collected signal.

## Review Pass 1

RESULT: ok

No blocking findings. The first patch pass correctly leaves no source diff for indirect profiler evidence, uses `## Evidence Confidence` as `inferred`, does not claim reproduction, and reports the attempted project-level build with the exact blocker.

The maintainer-facing explanation is appropriately cautious: it connects the observed `poll(2)` sleep, `restart_syscall`, and kernel `validate_xmit_skb` sample to a no-patch diagnosis rather than inventing an OpenSSH userspace bug. Validation also includes a bounded live-process reproduction attempt and explains why it could not reproduce the sampled signal.

## Plan Pass

## Problem
Fixer observed `sshd-session` associated with a “runaway CPU” investigation, but the captured process was sleeping in `poll`/`restart_syscall`, with `wchan=poll_schedule_timeout.constprop.0`, one strace line over 5s, and only 1.4% total CPU. The hot symbol was kernel-side `validate_xmit_skb`, not OpenSSH userspace. This does not currently support an upstream OpenSSH source patch.

## Evidence Confidence
inferred

## Proposed Subject
No source patch: diagnose likely external/kernel/network attribution for `sshd-session` poll sleep

## Patch Plan
Do not edit OpenSSH for this evidence as-is. The entrypoint is `sshd-session`; the relevant post-auth loop is `server_loop2()` in `serverloop.c`, which delegates poll setup to `channel_prepare_poll()` and timeout handling to the local `ptimeout_*` helpers in `misc.c`.

Local conventions/helpers found: `ppoll()` with `ptimeout_init()`, `ptimeout_deadline_*()`, `monotime()`, `fatal_f()`/`logit()`, `xrecallocarray()`, and channel `io_want`/`io_ready` bookkeeping. Only `README.md` was found among contribution/style docs; no `CONTRIBUTING`, `HACKING`, `docs/`, or `dev-docs/` were present.

A suspicious `channels.c` socket poll assignment exists (`pfd[p].events = 0` in the separate `c->sock` case), but nearby construction usually makes `c->sock == c->rfd` for listener/connecting sockets, so the evidence does not prove this path caused the observed process state. I would not present that as a fix without a reproducer that shows a missed socket event. No prior Fixer patch is present in the workspace to replace or improve.

## Risks
A source patch here would risk solving a speculative userspace bug while the actual signal points to kernel transmit work or normal idle polling. Adding watchdogs, forced sleeps, or `goto`-based loop escapes in `serverloop.c` would be awkward and upstream-hostile without proof of a userspace spin.

## Validation
Before any future focused check, try the project entrypoint from the workspace root:

`./configure && make`

If dependencies or generated files are missing, report the exact failing command and reason. For a bounded independent check, after a successful build run the forwarding-focused regression path, e.g. `make t-exec LTESTS=forwarding`, and inspect whether it leaves an `sshd-session` CPU-hot while stuck in `poll`. Only if that reproduces a userspace-side miss

[truncated]

Issue page: /issues/019e28a3-5528-79a0-8908-2efb33ff6591. Issue JSON: /v1/issues/019e28a3-5528-79a0-8908-2efb33ff6591

perl is stuck in a likely busy poll loop: 100.00% of sampled CPU passed through unresolved offset, with repeated thread backtraces show 1 thread(s) around 0x00007fa21036a7d2 in ?? () from target:<path>.

## 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): `./Configure -des -Dusedevel && make -j2 && make test_harness`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `perl` 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. 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. 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.

Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `./Configure -des -Dusedevel && make -j2 && make test_harness`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `perl` 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. 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 (local metadata check)

Local metadata consistency check

## Refinement Pass 1

You are refining a fixer patch after an explicit code review.

Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Read the latest author response at `./patch-output.txt`. Read the review report at `./review-1-output.txt`. This is refinement round 1. The original pre-edit snapshot is available at `./source` if you need to compare the current patch against it. Re-read the planning pass at `./plan-output.txt` before editing. The workspace currently changes these repo-relative paths: .config/README, .config/instruct, DynaLoader.o, MANIFEST.srt, Makefile, Policy.sh, av.o, bitcount.h, builtin.o, caretx.o, cflags, class.o, config.h, config.sh, cpan/Archive-Tar/Makefile, cpan/Archive-Tar/Makefile.PL, cpan/Archive-Tar/blib/bin/.exists, cpan/Archive-Tar/blib/man1/.exists, cpan/Archive-Tar/blib/man3/.exists, cpan/Archive-Tar/blib/script/.exists, cpan/Archive-Tar/pm_to_blib, cpan/AutoLoader/pm_to_blib, cpan/CPAN-Meta-Requirements/pm_to_blib, cpan/CPAN-Meta-YAML/pm_to_blib, cpan/CPAN-Meta/Makefile, cpan/CPAN-Meta/Makefile.PL, cpan/CPAN-Meta/blib/bin/.exists, cpan/CPAN-Meta/blib/man1/.exists, cpan/CPAN-Meta/blib/man3/.exists, cpan/CPAN-Meta/blib/script/.exists, cpan/CPAN-Meta/pm_to_blib, cpan/CPAN/Makefile, cpan/CPAN/Makefile.PL, cpan/CPAN/blib/bin/.exists, cpan/CPAN/blib/man1/.exists, cpan/CPAN/blib/man3/.exists, cpan/CPAN/blib/script/.exists, cpan/CPAN/pm_to_blib, cpan/Compress-Raw-Bzip2/Bzip2.bs, cpan/Compress-Raw-Bzip2/Bzip2.c, cpan/Compress-Raw-Bzip2/Bzip2.o, cpan/Compress-Raw-Bzip2/Makefile, cpan/Compress-Raw-Bzip2/blib/bin/.exists, cpan/Compress-Raw-Bzip2/blib/man1/.exists, cpan/Compress-Raw-Bzip2/blib/man3/.exists, cpan/Compress-Raw-Bzip2/blib/script/.exists, cpan/Compress-Raw-Bzip2/blocksort.c, cpan/Compress-Raw-Bzip2/blocksort.o, cpan/Compress-Raw-Bzip2/bzlib.c, cpan/Compress-Raw-Bzip2/bzlib.h, cpan/Compress-Raw-Bzip2/bzlib.o, cpan/Compress-Raw-Bzip2/bzlib_private.h, cpan/Compress-Raw-Bzip2/compress.c, cpan/Compress-Raw-Bzip2/compress.o, cpan/Compress-Raw-Bzip2/constants.h, cpan/Compress-Raw-Bzip2/constants.xs, cpan/Compress-Raw-Bzip2/crctable.c, cpan/Compress-Raw-Bzip2/crctable.o, cpan/Compress-Raw-Bzip2/decompress.c, cpan/Compress-Raw-Bzip2/decompress.o, cpan/Compress-Raw-Bzip2/huffman.c, cpan/Compress-Raw-Bzip2/huffman.o, cpan/Compress-Raw-Bzip2/pm_to_blib, cpan/Compress-Raw-Bzip2/randtable.c, cpan/Compress-Raw-Bzip2/randtable.o, cpan/Compress-Raw-Zlib/Makefile, cpan/Compress-Raw-Zlib/Zlib.bs, cpan/Compress-Raw-Zlib/Zlib.c, cpan/Compress-Raw-Zlib/Zlib.o, cpan/Compress-Raw-Zlib/adler32.c, cpan/Compress-Raw-Zlib/adler32.o, cpan/Compress-Raw-Zlib/blib/bin/.exists, cpan/Compress-Raw-Zlib/blib/man1/.exists, cpan/Compress-Raw-Zlib/blib/man3/.exists, cpan/Compress-Raw-Zlib/blib/script/.exists, cpan/Compress-Raw-Zlib/compress.c, cpan/Compress-Raw-Zlib/compress.o, cpan/Compress-Raw-Zlib/constants.h, cpan/Compress-Raw-Zlib/constants.xs, cpan/Compress-Raw-Zlib/crc32.c, cpan/Compress-Raw-Zlib/crc32.o, cpan/Compress-Raw-Zlib/deflate.c, cpan/Compress-Raw-Zlib/deflate.o, cpan/Compress-Raw-Zlib/infback.c, cpan/Compress-Raw-Zlib/infback.o, cpan/Compress-Raw-Zlib/inffast.c, cpan/Compress-Raw-Zlib/inffast.o, cpan/Compress-Raw-Zlib/inflate.c, cpan/Compress-Raw-Zlib/inflate.o, cpan/Compress-Raw-Zlib/inftrees.c, cpan/Compress-Raw-Zlib/inftrees.o, cpan/Compress-Raw-Zlib/pm_to_blib, cpan/Compress-Raw-Zlib/trees.c, cpan/Compress-Raw-Zlib/trees.o, cpan/Compress-Raw-Zlib/uncompr.c, cpan/Compress-Raw-Zlib/uncompr.o, cpan/Compress-Raw-Zlib/zutil.c, cpan/Compress-Raw-Zlib/zutil.o, cpan/Config-Perl-V/pm_to_blib, cpan/DB_File/ppport.h, cpan/Digest-MD5/MD5.bs, cpan/Digest-MD5/MD5.c, cpan/Digest-MD5/MD5.o, cpan/Digest-MD5/Makefile, cpan/Digest-MD5/blib/bin/.exists, cpan/Digest-MD5/blib/man1/.exists, cpan/Digest-MD5/blib/man3/.exists, cpan/Digest-MD5/blib/script/.exists, cpan/Digest-MD5/pm_to_blib, cpan/Digest-SHA/Makefile, cpan/Digest-SHA/SHA.bs, cpan/Digest-SHA/SHA.c, cpan/Digest-SHA/SHA.o, cpan/Digest-SHA/blib/bin/.exists, cpan/Digest-SHA/blib/man1/.exists, cpan/Digest-SHA/blib/man3/.exists, cpan/Digest-SHA/blib/script/.exists, cpan/Digest-SHA/blib/script/shasum, cpan/Digest-SHA/pm_to_blib, cpan/Digest/pm_to_blib, cpan/Encode/Byte/Byte.bs, cpan/Encode/Byte/Byte.c, cpan/Encode/Byte/Byte.o, cpan/Encode/Byte/Byte.xs, cpan/Encode/Byte/Makefile, cpan/Encode/Byte/byte_t.c, cpan/Encode/Byte/byte_t.exh, cpan/Encode/Byte/byte_t.fnm, cpan/Encode/Byte/byte_t.h, cpan/Encode/Byte/byte_t.o, cpan/Encode/Byte/pm_to_blib, cpan/Encode/CN/CN.bs, cpan/Encode/CN/CN.c, cpan/Encode/CN/CN.o, cpan/Encode/CN/CN.xs, cpan/Encode/CN/Makefile, cpan/Encode/CN/cp_00_t.c, cpan/Encode/CN/cp_00_t.exh, cpan/Encode/CN/cp_00_t.fnm, cpan/Encode/CN/cp_00_t.h, cpan/Encode/CN/cp_00_t.o, cpan/Encode/CN/eu_01_t.c, cpan/Encode/CN/eu_01_t.exh, cpan/Encode/CN/eu_01_t.fnm, cpan/Encode/CN/eu_01_t.h, cpan/Encode/CN/eu_01_t.o, cpan/Encode/CN/gb_02_t.c, cpan/Encode/CN/gb_02_t.exh, cpan/Encode/CN/gb_02_t.fnm, cpan/Encode/CN/gb_02_t.h, cpan/Encode/CN/gb_02_t.o, cpan/Encode/CN/gb_03_t.c, cpan/Encode/CN/gb_03_t.exh, cpan/Encode/CN/gb_03_t.fnm, cpan/Encode/CN/gb_03_t.h, cpan/Encode/CN/gb_03_t.o, cpan/Encode/CN/ir_04_t.c, cpan/Encode/CN/ir_04_t.exh, cpan/Encode/CN/ir_04_t.fnm, cpan/Encode/CN/ir_04_t.h, cpan/Encode/CN/ir_04_t.o, cpan/Encode/CN/ma_05_t.c, cpan/Encode/CN/ma_05_t.exh, cpan/Encode/CN/ma_05_t.fnm, cpan/Encode/CN/ma_05_t.h, cpan/Encode/CN/ma_05_t.o, cpan/Encode/CN/pm_to_blib, cpan/Encode/EBCDIC/EBCDIC.bs, cpan/Encode/EBCDIC/EBCDIC.c, cpan/Encode/EBCDIC/EBCDIC.o, cpan/Encode/EBCDIC/EBCDIC.xs, cpan/Encode/EBCDIC/Makefile, cpan/Encode/EBCDIC/ebcdic_t.c, cpan/Encode/EBCDIC/ebcdic_t.exh, cpan/Encode/EBCDIC/ebcdic_t.fnm, cpan/Encode/EBCDIC/ebcdic_t.h, cpan/Encode/EBCDIC/ebcdic_t.o, cpan/Encode/EBCDIC/pm_to_blib, cpan/Encode/Encode.bs, cpan/Encode/Encode.c, cpan/Encode/Encode.o, cpan/Encode/JP/JP.bs, cpan/Encode/JP/JP.c, cpan/Encode/JP/JP.o, cpan/Encode/JP/JP.xs, cpan/Encode/JP/Makefile, cpan/Encode/JP/cp_00_t.c, cpan/Encode/JP/cp_00_t.exh, cpan/Encode/JP/cp_00_t.fnm, cpan/Encode/JP/cp_00_t.h, cpan/Encode/JP/cp_00_t.o, cpan/Encode

[truncated 80388 bytes]

## Plan Pass

## Problem
Fixer attributed a “runaway CPU” investigation to `perl`, but the entrypoint evidence is `/usr/bin/perl -wT /usr/sbin/munin-node --foreground`. The bundled trace shows `munin-node` sleeping in `pselect6` with 2-second timeouts, process state `S`, `wchan=poll_schedule_timeout`, and only `0.1%` CPU. That does not prove a Perl runtime busy loop.

## Evidence Confidence
inferred

## Proposed Subject
No Perl core patch: evidence matches an application-level idle `select()` wait, not a demonstrated Perl runtime defect.

## Patch Plan
Do not edit Perl in this pass. The implicated runtime path would be `pp_sys.c` / `pp_sselect`, but that code already follows local Perl core conventions: it uses `PerlSock_select`, `SvGETMAGIC`, `SvPVX`/`SvCUR`/`Sv_Grow`, `Newx`, `Safefree`, and platform/endian conditionals rather than raw ad hoc libc handling.

Contribution/style docs checked: root `README`, `pod/perlhack.pod`, `pod/perlhacktips.pod`, `Porting/`, and local tests under `t/op/sselect.t`. Relevant conventions are portability across many platforms, no unnecessary globals, threaded-build awareness, and using Perl core wrapper/helper APIs.

No prior Fixer patch exists in this workspace beyond the baseline commit, so there is nothing to improve or replace. If later evidence shows `select()` returning immediately despite a positive timeout, then a patch could be planned against `pp_sys.c` plus `t/op/sselect.t`; it should keep the control flow bounded and avoid adding awkward `goto` paths.

## Risks
Patching Perl from this evidence would be speculative and could change long-standing `select()` semantics for event loops and sleeps. The real issue, if any, is more likely in `munin-node`’s polling policy or in Fixer’s busy-poll classification, since the observed syscall blocks for roughly the requested timeout.

## Validation
If a source patch becomes justified, first try the project-level entrypoint from the workspace root:

`./Configure -des -Dusedevel && make -j2 && make test_harness`

Focused follow-up would be `./perl -Ilib t/op/sselect.t`.

Bounded independent signal check: run a small `select()` timeout under `strace`, for example `strace -tt -e pselect6 ./perl -Ilib -e 'pipe my $r,my $w; my $rin=""; vec($rin, fileno($r), 1)=1; select(my $rout=$rin, undef, undef, 2)'`, and confirm it blocks for about 2 seconds rather than spinning. If the full build cannot complete, report that exact failure before relying on the focused check.

## Patch Pass

Subject: No Perl core patch for idle select trace

## Commit Message
No source change is proposed. The collected evidence shows a Perl process running `munin-node` blocked in `select(2)`, the operating-system call used by Perl’s four-argument `select` for waiting on file descriptors. The trace shows timed sleeps, not a reproduced Perl runtime spin.

## Evidence Confidence
inferred

## Issue Connection
Fixer observed `/usr/bin/perl -wT /usr/sbin/munin-node --foreground` with backtraces in `select()` and repeated `pselect6` calls. The `/proc` evidence says the process was sleeping (`State: S`, `wchan=poll_schedule_timeout`) and the strace excerpt shows `pselect6` blocking for about 0.546s and then about 2.002s per call, while reported CPU was only 0.1%.

The likely root cause is an idle `munin-node` event loop waiting with a 2-second timeout, or a Fixer classifier false positive, not a Perl core busy-poll bug. The relevant Perl core path is `pp_sys.c`’s `pp_sselect`, which already uses the local compatibility wrapper `PerlSock_select` and core SV/allocation helpers such as `SvGETMAGIC`, `SvPVX`, `Sv_Grow`, `Newx`, and `Safefree`.

I followed the saved plan and did not change course: without stronger evidence showing `select()` returning immediately or Perl miscomputing the timeout, a source patch would be speculative and not pull-request-ready. The expected effect of this no-patch report is to avoid an upstream Perl change for evidence that currently matches normal blocking behavior.

## Git Add Paths
None

## Validation
Tried project-level entrypoint from the workspace root:

`./Configure -des -Dusedevel && make -j2 && make test_harness`

Result: `Configure` and `make -j2` progressed successfully into `make test_harness`. The harness did not complete in this environment; before it stopped producing output, unrelated failures were already visible:
`op/groups.t` failed one subtest about supplementary group `daemon`.
`porting/authors.t` failed because `.mailmap` was missing.
`porting/manifest.t` failed because Debian-source packaging files and `.pc` quilt files are not in upstream `MANIFEST`.
`porting/regen.t` failed because `lib/.gitignore` was missing.

Bounded independent reproduction attempt:
`strace -tt -T -e pselect6 /usr/bin/perl -e '...'` could not run because ptrace is blocked: `PTRACE_TRACEME: Operation not permitted`.

Fallback smoke check:
`/usr/bin/perl -MTime::HiRes=time -e 'pipe my $r, my $w or die $!; my $rin = q{}; vec($rin, fileno($r), 1) = 1; my $t = time; my $n = select(my $rout = $rin, undef, undef, 2); printf "n=%s elapsed=%.3f\n", $n, time - $t'`

Result: `n=0 elapsed=2.001`, which did not reproduce a busy loop.

## Review Pass 1 (local metadata check)

RESULT: fix-needed

## Findings
1. Patch metadata drift: the workspace currently changes `.config/README`, `.config/instruct`, `DynaLoader.o`, `MANIFEST.srt`, `Makefile`, `Policy.sh`, `av.o`, `bitcount.h`, `builtin.o`, `caretx.o`, `cflags`, `class.o`, `config.h`, `config.sh`, `cpan/Archive-Tar/Makefile`, `cpan/Archive-Tar/Makefile.PL`, `cpan/Archive-Tar/blib/bin/.exists`, `cpan/Archive-Tar/blib/man1/.exists`, `cpan/Archive-Tar/blib/man3/.exists`, `cpan/Archive-Tar/blib/script/.exists`, `cpan/Archive-Tar/pm_to_blib`, `cpan/AutoLoader/pm_to_blib`, `cpan/CPAN-Meta-Requirements/pm_to_blib`, `cpan/CPAN-Meta-YAML/pm_to_blib`, `cpan/CPAN-Meta/Makefile`, `cpan/CPAN-Meta/Makefile.PL`, `cpan/CPAN-Meta/blib/bin/.exists`, `cpan/CPAN-Meta/blib/man1/.exists`, `cpan/CPAN-Meta/blib/man3/.exists`, `cpan/CPAN-Meta/blib/script/.exists`, `cpan/CPAN-Meta/pm_to_blib`, `cpan/CPAN/Makefile`, `cpan/CPAN/Makefile.PL`, `cpan/CPAN/blib/bin/.exists`, `cpan/CPAN/blib/man1/.exists`, `cpan/CPAN/blib/man3/.exists`, `cpan/CPAN/blib/script/.exists`, 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`cpan/Encode/KR/KR.bs`, `cpan/Encode/KR/KR.c`, `cpan/Encode/KR/KR.o`, `cpan/Encode/KR/KR.xs`, `cpan/Encode/KR/Makefile`, `cpan/Encode/KR/cp_00_t.c`, `cpan/Encode/KR/cp_00_t.exh`, `cpan/Encode/KR/cp_00_t.fnm`, `cpan/Encode/KR/cp_00_t.h`, `cpan/Encode/KR/cp_00_t.o`, `cpan/Encode/KR/eu_01_t.c`, `cpan/Encode/KR/eu_01_t.exh`, `cpan/Encode/KR/eu_01_t.fnm`, `cpan/Encode/KR/eu_01_t.h`, `cpan/Encode/KR/eu_01_t.o`, `cpan/Encode/KR/jo_02_t.c`, `cpan/Encode/KR/jo_02_t.exh`, `cpan/Encode/KR/jo_02_t.fnm`, `cpan/Encode/KR/jo_02_t.h`, `cpan/Encode/KR/jo_02_t.o`, `cpan/Encode/KR/ks_03_t.c`, `cpan/Encode/KR/ks_03_t.exh`, `cpan/Encode/KR/ks_03_t.fnm`, `cpan/Encode/KR/ks_03_t.h`, `cpan/Encode/KR/ks_03_t.o`, `cpan/Encode/KR/ma_04_t.c`, `cpan/Encode/KR/ma_04_t.exh`, `cpan/Encode/KR/ma_04_t.fnm`, `cpan/Encode/KR/ma_04_t.h`, `cpan/Encode/KR/ma_04_t.o`, `cpan/Encode/KR/pm_to_blib`, `cpan/Encode/Makefile`, `cpan/Encode/Symbol/Makefile`, `cpan/Encode/Symbol/Symbol.bs`, `cpan/Encode/Symbol/Symbol.c`, `cpan/Encode/Symbol/Symbol.o`, `cpan/Encode/Symbol/Symbol.xs`, `cpan/Encode/Symbol/pm_to_blib`, `cpan/Encode/Symbol/symbol_t.c`, `cpan/Encode/Symbol/symbol_t.exh`, `cpan/Encode/Symbol/symbol_t.fnm`, `cpan/Encode/Symbol/symbol_t.h`, `cpan/Encode/Symbol/symbol_t.o`, `cpan/Encode/TW/Makefile`, `cpan/Encode/TW/TW.bs`, `cpan/Encode/TW/TW.c`, `cpan/Encode/TW/TW.o`, `cpan/Encode/TW/TW.xs`, `cpan/Encode/TW/bi_00_t.c`, `cpan/Encode/TW/bi_00_t.exh`, `cpan/Encode/TW/bi_00_t.fnm`, `cpan/Encode/TW/bi_00_t.h`, `cpan/Encode/TW/bi_00_t.o`, `cpan/Encode/TW/bi_01_t.c`, `cpan/Encode/TW/bi_01_t.exh`, `cpan/Encode/TW/bi_01_t.fnm`, `cpan/Encode/TW/bi_01_t.h`, `cpan/Encode/TW/bi_01_t.o`, `cpan/Encode/TW/cp_02_t.c`, `cpan/Encode/TW/cp_02_t.exh`, `cpan/Encode/TW/cp_02_t.fnm`, `cpan/Encode/TW/cp_02_t.h`, `cpan/Encode/TW/cp_02_t.o`, `cpan/Encode/TW/ma_03_t.c`, `cpan/Encode/TW/ma_03_t.exh`, `cpan/Encode/TW/ma_03_t.fnm`, `cpan/Encode/TW/ma_03_t.h`, `cpan/Encode/TW/ma_03_t.o`, `cpan/Encode/TW/pm_to_blib`, `cpan/Encode/Unicode/Makefile`, `cpan/Encode/Unicode/Unicode.bs`, `cpan/Encode/Unicode/Unicode.c`, `cpan/Encode/Unicode/Unicode.o`, `cpan/Encode/Unicode/pm_to_blib`, `cpan/Encode/blib/bin/.exists`, `cpan/Encode/blib/man1/.exists`, `cpan/Encode/blib/man3/.exists`, `cpan/Encode/blib/script/.exists`, `cpan/Encode/blib/script/enc2xs`, `cpan/Encode/blib/script/encguess`, `cpan/Encode/blib/script/piconv`, `cpan/Encode/def_t.c`, `cpan/Encode/def_t.exh`, `cpan/Encode/def_t.fnm`, `cpan/Encode/def_t.h`, `cpan/Encode/def_t.o`, `cpan/Encode/encengine.o`, `cpan/Encode/pm_to_blib`, `cpan/ExtUtils-Constant/pm_to_blib`, `cpan/ExtUtils-Install/pm_to_blib`, `cpan/ExtUtils-MakeMaker/Makefile`, `cpan/ExtUtils-MakeMaker/Makefile.PL`, `cpan/ExtUtils-MakeMaker/blib/bin/.exists`, `cpan/ExtUtils-MakeMaker/blib/man1/.exists`, `cpan/ExtUtils-MakeMaker/blib/man3/.exists`, `cpan/ExtUtils-MakeMaker/blib/script/.exists`, `cpan/ExtUtils-MakeMaker/pm_to_blib`, `cpan/ExtUtils-Manifest/Makefile`, `cpan/ExtUtils-Manifest/Makefile.PL`, `cpan/ExtUtils-Manifest/blib/bin/.exists`, `cpan/ExtUtils-Manifest/blib/man1/.exists`, `cpan/ExtUtils-Manifest/blib/man3/.exists`, `cpan/ExtUtils-Manifest/blib/script/.exists`, `cpan/ExtUtils-Manifest/pm_to_blib`, `cpan/ExtUtils-PL2Bat/pm_to_blib`, `cpan/File-Fetch/pm_to_blib`, `cpan/File-Path/pm_to_blib`, `cpan/File-Temp/pm_to_blib`, `cpan/Filter-Util-Call/Call.bs`, `cpan/Filter-Util-Call/Call.c`, `cpan/Filter-Util-Call/Call.o`, `cpan/Filter-Util-Call/Makefile`, `cpan/Filter-Util-Call/Makefile.PL`, `cpan/Filter-Util-Call/blib/bin/.exists`, `cpan/Filter-Util-Call/blib/man1/.exists`, `cpan/Filter-Util-Call/blib/man3/.exists`, `cpan/Filter-Util-Call/blib/script/.exists`, `cpan/Filter-Util-Call/pm_to_blib`, `cpan/Getopt-Long/pm_to_blib`, `cpan/HTTP-Tiny/Makefile`, `cpan/HTTP-Tiny/Makefile.PL`, `cpan/HTTP-Tiny/blib/bin/.exists`, `cpan/HTTP-Tiny/blib/man1/.exists`, `cpan/HTTP-Tiny/blib/man3/.exists`, `cpan/HTTP-Tiny/blib/script/.exists`, `cpan/HTTP-Tiny/pm_to_blib`, `cpan/IO-Compress/Makefile`, `cpan/IO-Compress/blib/bin/.exists`, `cpan/IO-Compress/blib/man1/.exists`, `cpan/IO-Compress/blib/man3/.exists`, `cpan/IO-Compress/blib/script/.exists`, `cpan/IO-Compress/blib/script/streamzip`, `cpan/IO-Compress/blib/script/zipdetails`, `cpan/IO-Compress/pm_to_blib`, `cpan/IO-Socket-IP/pm_to_blib`, `cpan/IO-Zlib/pm_to_blib`, `cpan/IPC-Cmd/pm_to_blib`, `cpan/IPC-SysV/Makefile`, `cpan/IPC-SysV/SysV.bs`, `cpan/IPC-SysV/SysV.c`, `cpan/IPC-SysV/SysV.o`, `cpan/IPC-SysV/blib/bin/.exists`, `cpan/IPC-SysV/blib/man1/.exists`, `cpan/IPC-SysV/blib/man3/.exists`, `cpan/IPC-SysV/blib/script/.exists`, `cpan/IPC-SysV/const-c.inc`, `cpan/IPC-SysV/const-xs.inc`, `cpan/IPC-SysV/pm_to_blib`, `cpan/IPC-SysV/ppport.h`, `cpan/JSON-PP/Makefile`, `cpan/JSON-PP/Makefile.PL`, `cpan/JSON-PP/blib/bin/.exists`, `cpan/JSON-PP/blib/man1/.exists`, `cpan/JSON-PP/blib/man3/.exists`, `cpan/JSON-PP/blib/script/.exists`, `cpan/JSON-PP/pm_to_blib`, `cpan/Locale-Maketext-Simple/pm_to_blib`, `cpan/MIME-Base64/Base64.bs`, `cpan/MIME-Base64/Base64.c`, `cpan/MIME-Base64/Base64.o`, `cpan/MIME-Base64/Makefile`, `cpan/MIME-Base64/Makefile.PL`, `cpan/MIME-Base64/blib/bin/.exists`, `cpan/MIME-Base64/blib/man1/.exists`, `cpan/MIME-Base64/blib/man3/.exists`, `cpan/MIME-Base64/blib/script/.exists`, `cpan/MIME-Base64/pm_to_blib`, `cpan/Math-BigInt-FastCalc/FastCalc.bs`, `cpan/Math-BigInt-FastCalc/FastCalc.c`, `cpan/Math-BigInt-FastCalc/FastCalc.o`, `cpan/Math-BigInt-FastCalc/Makefile`, `cpan/Math-BigInt-FastCalc/Makefile.PL`, `cpan/Math-BigInt-FastCalc/blib/bin/.exists`, `cpan/Math-BigInt-FastCalc/blib/man1/.exists`, `cpan/Math-BigInt-FastCalc/blib/man3/.exists`, `cpan/Math-BigInt-FastCalc/blib/script/.exists`, `cpan/Math-BigInt-FastCalc/pm_to_blib`, `cpan/Math-BigInt/pm_to_blib`, `cpan/Memoize/pm_to_blib`, `cpan/Module-Load-Conditional/pm_to_blib`, `cpan/Module-Load/pm_to_blib`, `cpan/Module-Loaded/pm_to_blib`, `cpan/Module-Metadata/Makefile`, `cpan/Module-Metadata/Makefile.PL`, `cpan/Module-Metadata/blib/bin/.exists`, `cpan/Module-Metadata/blib/man1/.exists`, `cpan/Module-Metadata/blib/man3/.exists`, `cpan/Module-Metadata/blib/script/.exists`, `cpan/Module-Metadata/pm_to_blib`, `cpan/NEXT/pm_to_blib`, `cpan/Params-Check/pm_to_blib`, `cpan/Perl-OSType/pm_to_blib`, `cpan/PerlIO-via-QuotedPrint/pm_to_blib`, `cpan/Pod-Checker/Makefile`, `cpan/Pod-Checker/Makefile.PL`, `cpan/Pod-Checker/blib/bin/.exists`, `cpan/Pod-Checker/blib/man1/.exists`, `cpan/Pod-Checker/blib/man3/.exists`, `cpan/Pod-Checker/blib/script/.exists`, `cpan/Pod-Checker/blib/script/podchecker`, `cpan/Pod-Checker/pm_to_blib`, `cpan/Pod-Checker/podchecker`, `cpan/Pod-Checker/podchecker.PL`, `cpan/Pod-Escapes/pm_to_blib`, `cpan/Pod-Perldoc/Makefile`, `cpan/Pod-Perldoc/blib/bin/.exists`, `cpan/Pod-Perldoc/blib/man1/.exists`, `cpan/Pod-Perldoc/blib/man3/.exists`, `cpan/Pod-Perldoc/blib/script/.exists`, `cpan/Pod-Perldoc/pm_to_blib`, `cpan/Pod-Simple/pm_to_blib`, `cpan/Pod-Usage/Makefile`, `cpan/Pod-Usage/Makefile.PL`, `cpan/Pod-Usage/blib/bin/.exists`, `cpan/Pod-Usage/blib/man1/.exists`, `cpan/Pod-Usage/blib/man3/.exists`, `cpan/Pod-Usage/blib/script/.exists`, `cpan/Pod-Usage/blib/script/pod2usage`, `cpan/Pod-Usage/pm_to_blib`, `cpan/Pod-Usage/pod2usage`, `cpan/Pod-Usage/pod2usage.PL`, `cpan/Scalar-List-Utils/ListUtil.c`, `cpan/Scalar-List-Utils/ListUtil.o`, `cpan/Scalar-List-Utils/Makefile`, `cpan/Scalar-List-Utils/Util.bs`, `cpan/Scalar-List-Utils/blib/bin/.exists`, `cpan/Scalar-List-Utils/blib/man1/.exists`, `cpan/Scalar-List-Utils/blib/man3/.exists`, `cpan/Scalar-List-Utils/blib/script/.exists`, `cpan/Scalar-List-Utils/pm_to_blib`, `cpan/Socket/Makefile`, `cpan/Socket/Socket.bs`, `cpan/Socket/Socket.c`, `cpan/Socket/Socket.o`, `cpan/Socket/blib/bin/.exists`, `cpan/Socket/blib/man1/.exists`, `cpan/Socket/blib/man3/.exists`, `cpan/Socket/blib/script/.exists`, `cpan/Socket/const-c.inc`, `cpan/Socket/const-xs.inc`, `cpan/Socket/pm_to_blib`, `cpan/Sys-Syslog/Makefile`, `cpan/Sys-Syslog/Syslog.bs`, `cpan/Sys-Syslog/Syslog.c`, `cpan/Sys-Syslog/Syslog.o`, `cpan/Sys-Syslog/blib/bin/.exists`, `cpan/Sys-Syslog/blib/man1/.exists`, `cpan/Sys-Syslog/blib/man3/.exists`, `cpan/Sys-Syslog/blib/script/.exists`, `cpan/Sys-Syslog/const-c.inc`, `cpan/Sys-Syslog/const-xs.inc`, `cpan/Sys-Syslog/macros.all`, `cpan/Sys-Syslog/pm_to_blib`, `cpan/Term-ANSIColor/pm_to_blib`, `cpan/Term-Cap/Makefile`, `cpan/Term-Cap/Makefile.PL`, `cpan/Term-Cap/blib/bin/.exists`, `cpan/Term-Cap/blib/man1/.exists`, `cpan/Term-Cap/blib/man3/.exists`, `cpan/Term-Cap/blib/script/.exists`, `cpan/Term-Cap/pm_to_blib`, `cpan/Term-Table/pm_to_blib`, `cpan/Test-Harness/Makefile`, `cpan/Test-Harness/Makefile.PL`, `cpan/Test-Harness/blib/bin/.exists`, `cpan/Test-Harness/blib/man1/.exists`, `cpan/Test-Harness/blib/man3/.exists`, `cpan/Test-Harness/blib/script/.exists`, `cpan/Test-Harness/pm_to_blib`, `cpan/Test-Simple/pm_to_blib`, `cpan/Test2-Suite/pm_to_blib`, `cpan/Text-Balanced/pm_to_blib`, `cpan/Text-ParseWords/pm_to_blib`, `cpan/Text-Tabs/pm_to_blib`, `cpan/Tie-RefHash/pm_to_blib`, `cpan/Time-Local/pm_to_blib`, `cpan/Time-Piece/Makefile`, `cpan/Time-Piece/Makefile.PL`, `cpan/Time-Piece/Piece.bs`, `cpan/Time-Piece/Piece.c`, `cpan/Time-Piece/Piece.o`, `cpan/Time-Piece/blib/bin/.exists`, `cpan/Time-Piece/blib/man1/.exists`, `cpan/Time-Piece/blib/man3/.exists`, `cpan/Time-Piece/blib/script/.exists`, `cpan/Time-Piece/pm_to_blib`, `cpan/Unicode-Collate/Collate.bs`, `cpan/Unicode-Collate/Collate.c`, `cpan/Unicode-Collate/Collate.o`, `cpan/Unicode-Collate/Makefile`, `cpan/Unicode-Collate/blib/bin/.exists`, `cpan/Unicode-Collate/blib/man1/.exists`, `cpan/Unicode-Collate/blib/man3/.exists`, `cpan/Unicode-Collate/blib/script/.exists`, `cpan/Unicode-Collate/pm_to_blib`, `cpan/Unicode-Collate/ucatbl.h`, `cpan/Win32API-File/ppport.h`, `cpan/autodie/pm_to_blib`, `cpan/bignum/Makefile`, `cpan/bignum/Makefile.PL`, `cpan/bignum/blib/bin/.exists`, `cpan/bignum/blib/man1/.exists`, `cpan/bignum/blib/man3/.exists`, `cpan/bignum/blib/script/.exists`, `cpan/bignum/pm_to_blib`, `cpan/experimental/pm_to_blib`, `cpan/libnet/Makefile`, `cpan/libnet/blib/bin/.exists`, `cpan/libnet/blib/man1/.exists`, `cpan/libnet/blib/man3/.exists`, `cpan/libnet/blib/script/.exists`, `cpan/libnet/pm_to_blib`, `cpan/parent/pm_to_blib`, `cpan/perlfaq/pm_to_blib`, `cpan/podlators/Makefile`, `cpan/podlators/blib/bin/.exists`, `cpan/podlators/blib/man1/.exists`, `cpan/podlators/blib/man1/pod2man.1`, `cpan/podlators/blib/man1/pod2text.1`, `cpan/podlators/blib/man3/.exists`, `cpan/podlators/blib/script/.exists`, `cpan/podlators/blib/script/pod2man`, `cpan/podlators/blib/script/pod2text`, `cpan/podlators/pm_to_blib`, `cpan/podlators/scripts/pod2man`, `cpan/podlators/scripts/pod2text`, `cpan/version/pm_to_blib`, `deb.o`, `dist/Attribute-Handlers/Makefile`, `dist/Attribute-Handlers/blib/bin/.exists`, `dist/Attribute-Handlers/blib/man1/.exists`, `dist/Attribute-Handlers/blib/man3/.exists`, `dist/Attribute-Handlers/blib/script/.exists`, `dist/Attribute-Handlers/pm_to_blib`, `dist/Carp/pm_to_blib`, `dist/Data-Dumper/Dumper.bs`, `dist/Data-Dumper/Dumper.c`, `dist/Data-Dumper/Dumper.o`, `dist/Data-Dumper/Makefile`, `dist/Data-Dumper/blib/bin/.exists`, `dist/Data-Dumper/blib/man1/.exists`, `dist/Data-Dumper/blib/man3/.exists`, `dist/Data-Dumper/blib/script/.exists`, `dist/Data-Dumper/pm_to_blib`, `dist/Data-Dumper/ppport.h`, `dist/Devel-PPPort/Makefile`, `dist/Devel-PPPort/PPPort.bs`, `dist/Devel-PPPort/PPPort.pm`, `dist/Devel-PPPort/RealPPPort.c`, `dist/Devel-PPPort/RealPPPort.o`, `dist/Devel-PPPort/RealPPPort.xs`, `dist/Devel-PPPort/blib/bin/.exists`, `dist/Devel-PPPort/blib/man1/.exists`, `dist/Devel-PPPort/blib/man3/.exists`, `dist/Devel-PPPort/blib/script/.exists`, `dist/Devel-PPPort/module2.o`, `dist/Devel-PPPort/module3.o`, `dist/Devel-PPPort/pm_to_blib`, `dist/Devel-PPPort/ppport.h`, `dist/Devel-PPPort/t/01_test.t`, `dist/Devel-PPPort/t/HvNAME.t`, `dist/Devel-PPPort/t/MY_CXT.t`, `dist/Devel-PPPort/t/SvPV.t`, `dist/Devel-PPPort/t/SvREFCNT.t`, `dist/Devel-PPPort/t/Sv_set.t`, `dist/Devel-PPPort/t/call.t`, `dist/Devel-PPPort/t/cop.t`, `dist/Devel-PPPort/t/exception.t`, `dist/Devel-PPPort/t/format.t`, `dist/Devel-PPPort/t/grok.t`, `dist/Devel-PPPort/t/gv.t`, `dist/Devel-PPPort/t/limits.t`, `dist/Devel-PPPort/t/locale.t`, `dist/Devel-PPPort/t/mPUSH.t`, `dist/Devel-PPPort/t/magic.t`, `dist/Devel-PPPort/t/memory.t`, `dist/Devel-PPPort/t/mess.t`, `dist/Devel-PPPort/t/misc.t`, `dist/Devel-PPPort/t/newCONSTSUB.t`, `dist/Devel-PPPort/t/newRV.t`, `dist/Devel-PPPort/t/newSV_type.t`, `dist/Devel-PPPort/t/newSVpv.t`, `dist/Devel-PPPort/t/podtest.t`, `dist/Devel-PPPort/t/ppphtest.t`, `dist/Devel-PPPort/t/pv_tools.t`, `dist/Devel-PPPort/t/pvs.t`, `dist/Devel-PPPort/t/shared_pv.t`, `dist/Devel-PPPort/t/snprintf.t`, `dist/Devel-PPPort/t/sprintf.t`, `dist/Devel-PPPort/t/strlfuncs.t`, `dist/Devel-PPPort/t/sv_xpvf.t`, `dist/Devel-PPPort/t/threads.t`, `dist/Devel-PPPort/t/utf8.t`, `dist/Devel-PPPort/t/uv.t`, `dist/Devel-PPPort/t/variables.t`, `dist/Devel-PPPort/t/warn.t`, `dist/Devel-SelfStubber/pm_to_blib`, `dist/Dumpvalue/pm_to_blib`, `dist/Env/pm_to_blib`, `dist/Exporter/Makefile`, `dist/Exporter/blib/bin/.exists`, `dist/Exporter/blib/man1/.exists`, `dist/Exporter/blib/man3/.exists`, `dist/Exporter/blib/script/.exists`, `dist/Exporter/pm_to_blib`, `dist/ExtUtils-CBuilder/pm_to_blib`, `dist/ExtUtils-ParseXS/Makefile`, `dist/ExtUtils-ParseXS/Makefile.PL`, `dist/ExtUtils-ParseXS/blib/bin/.exists`, `dist/ExtUtils-ParseXS/blib/man1/.exists`, `dist/ExtUtils-ParseXS/blib/man3/.exists`, `dist/ExtUtils-ParseXS/blib/script/.exists`, `dist/ExtUtils-ParseXS/pm_to_blib`, `dist/ExtUtils-ParseXS/ppport.h`, `dist/Filter-Simple/Makefile`, `dist/Filter-Simple/blib/bin/.exists`, `dist/Filter-Simple/blib/man1/.exists`, `dist/Filter-Simple/blib/man3/.exists`, `dist/Filter-Simple/blib/script/.exists`, `dist/Filter-Simple/pm_to_blib`, `dist/FindBin/Makefile`, `dist/FindBin/blib/bin/.exists`, `dist/FindBin/blib/man1/.exists`, `dist/FindBin/blib/man3/.exists`, `dist/FindBin/blib/script/.exists`, `dist/FindBin/pm_to_blib`, `dist/I18N-Collate/pm_to_blib`, `dist/I18N-LangTags/Makefile`, `dist/I18N-LangTags/blib/bin/.exists`, `dist/I18N-LangTags/blib/man1/.exists`, `dist/I18N-LangTags/blib/man3/.exists`, `dist/I18N-LangTags/blib/script/.exists`, `dist/I18N-LangTags/pm_to_blib`, `dist/IO/IO.bs`, `dist/IO/IO.c`, `dist/IO/IO.o`, `dist/IO/Makefile`, `dist/IO/blib/bin/.exists`, `dist/IO/blib/man1/.exists`, `dist/IO/blib/man3/.exists`, `dist/IO/blib/script/.exists`, `dist/IO/pm_to_blib`, `dist/IO/poll.o`, `dist/IO/ppport.h`, `dist/Locale-Maketext/Makefile`, `dist/Locale-Maketext/blib/bin/.exists`, `dist/Locale-Maketext/blib/man1/.exists`, `dist/Locale-Maketext/blib/man3/.exists`, `dist/Locale-Maketext/blib/script/.exists`, `dist/Locale-Maketext/pm_to_blib`, `dist/Math-Complex/Makefile`, `dist/Math-Complex/blib/bin/.exists`, `dist/Math-Complex/blib/man1/.exists`, `dist/Math-Complex/blib/man3/.exists`, `dist/Math-Complex/blib/script/.exists`, `dist/Math-Complex/pm_to_blib`, `dist/Module-CoreList/Makefile`, `dist/Module-CoreList/blib/bin/.exists`, `dist/Module-CoreList/blib/man1/.exists`, `dist/Module-CoreList/blib/man3/.exists`, `dist/Module-CoreList/blib/script/.exists`, `dist/Module-CoreList/blib/script/corelist`, `dist/Module-CoreList/pm_to_blib`, `dist/Net-Ping/Makefile`, `dist/Net-Ping/blib/bin/.exists`, `dist/Net-Ping/blib/man1/.exists`, `dist/Net-Ping/blib/man3/.exists`, `dist/Net-Ping/blib/script/.exists`, `dist/Net-Ping/pm_to_blib`, `dist/PathTools/Cwd.bs`, `dist/PathTools/Cwd.c`, `dist/PathTools/Cwd.o`, `dist/PathTools/Makefile`, `dist/PathTools/blib/bin/.exists`, `dist/PathTools/blib/man1/.exists`, `dist/PathTools/blib/man3/.exists`, 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`lib/Unicode/Collate/Locale/sv_refo.pl`, `lib/Unicode/Collate/Locale/ta.pl`, `lib/Unicode/Collate/Locale/te.pl`, `lib/Unicode/Collate/Locale/th.pl`, `lib/Unicode/Collate/Locale/tn.pl`, `lib/Unicode/Collate/Locale/to.pl`, `lib/Unicode/Collate/Locale/tr.pl`, `lib/Unicode/Collate/Locale/ug_cyrl.pl`, `lib/Unicode/Collate/Locale/uk.pl`, `lib/Unicode/Collate/Locale/ur.pl`, `lib/Unicode/Collate/Locale/vi.pl`, `lib/Unicode/Collate/Locale/vo.pl`, `lib/Unicode/Collate/Locale/wae.pl`, `lib/Unicode/Collate/Locale/wo.pl`, `lib/Unicode/Collate/Locale/yo.pl`, `lib/Unicode/Collate/Locale/zh.pl`, `lib/Unicode/Collate/Locale/zh_big5.pl`, `lib/Unicode/Collate/Locale/zh_gb.pl`, `lib/Unicode/Collate/Locale/zh_pin.pl`, `lib/Unicode/Collate/Locale/zh_strk.pl`, `lib/Unicode/Collate/Locale/zh_zhu.pl`, `lib/Unicode/Collate/allkeys.txt`, `lib/Unicode/Collate/keys.txt`, `lib/Unicode/Normalize.pm`, `lib/XS/.exists`, `lib/XS/APItest.pm`, `lib/XS/Typemap.pm`, `lib/XSLoader.pm`, `lib/attributes.pm`, `lib/auto/Archive/Tar/.exists`, `lib/auto/Attribute/Handlers/.exists`, `lib/auto/B/.exists`, `lib/auto/B/B.so`, `lib/auto/CPAN/.exists`, `lib/auto/CPAN/Meta/.exists`, `lib/auto/Compress/Raw/Bzip2/.exists`, `lib/auto/Compress/Raw/Bzip2/Bzip2.so`, `lib/auto/Compress/Raw/Zlib/.exists`, `lib/auto/Compress/Raw/Zlib/Zlib.so`, `lib/auto/Cwd/.exists`, `lib/auto/Cwd/Cwd.so`, `lib/auto/Data/Dumper/.exists`, `lib/auto/Data/Dumper/Dumper.so`, `lib/auto/Devel/PPPort/.exists`, `lib/auto/Devel/PPPort/PPPort.so`, `lib/auto/Devel/Peek/.exists`, `lib/auto/Devel/Peek/Peek.so`, `lib/auto/Digest/MD5/.exists`, `lib/auto/Digest/MD5/MD5.so`, `lib/auto/Digest/SHA/.exists`, `lib/auto/Digest/SHA/SHA.so`, `lib/auto/DynaLoader/.exists`, `lib/auto/Encode/.exists`, `lib/auto/Encode/Byte/.exists`, `lib/auto/Encode/Byte/Byte.so`, `lib/auto/Encode/CN/.exists`, `lib/auto/Encode/CN/CN.so`, `lib/auto/Encode/EBCDIC/.exists`, `lib/auto/Encode/EBCDIC/EBCDIC.so`, `lib/auto/Encode/Encode.so`, `lib/auto/Encode/JP/.exists`, `lib/auto/Encode/JP/JP.so`, `lib/auto/Encode/KR/.exists`, `lib/auto/Encode/KR/KR.so`, `lib/auto/Encode/Symbol/.exists`, `lib/auto/

[truncated 109416 bytes]

## Plan Pass

## Problem
Fixer attributed a “runaway CPU” investigation to `perl`, but the entrypoint evidence is `/usr/bin/perl -wT /usr/sbin/munin-node --foreground`. The bundled trace shows `munin-node` sleeping in `pselect6` with 2-second timeouts, process state `S`, `wchan=poll_schedule_timeout`, and only `0.1%` CPU. That does not prove a Perl runtime busy loop.

## Evidence Confidence
inferred

## Proposed Subject
No Perl core patch: evidence matches an application-level idle `select()` wait, not a demonstrated Perl runtime defect.

## Patch Plan
Do not edit Perl in this pass. The implicated runtime path would be `pp_sys.c` / `pp_sselect`, but that code already follows local Perl core conventions: it uses `PerlSock_select`, `SvGETMAGIC`, `SvPVX`/`SvCUR`/`Sv_Grow`, `Newx`, `Safefree`, and platform/endian conditionals rather than raw ad hoc libc handling.

Contribution/style docs checked: root `README`, `pod/perlhack.pod`, `pod/perlhacktips.pod`, `Porting/`, and local tests under `t/op/sselect.t`. Relevant conventions are portability across many platforms, no unnecessary globals, threaded-build awareness, and using Perl core wrapper/helper APIs.

No prior Fixer patch exists in this workspace beyond the baseline commit, so there is nothing to improve or replace. If later evidence shows `select()` returning immediately despite a positive timeout, then a patch could be planned against `pp_sys.c` plus `t/op/sselect.t`; it should keep the control flow bounded and avoid adding awkward `goto` paths.

## Risks
Patching Perl from this evidence would be speculative and could change long-standing `select()` semantics for event loops and sleeps. The real issue, if any, is more likely in `munin-node`’s polling policy or in Fixer’s busy-poll classification, since the observed syscall blocks for roughly the requested timeout.

## Validation
If a source patch becomes justified, first try the project-level entrypoint from the workspace root:

`./Configure -des -Dusedevel && make -j2 && make test_harness`

Focused follow-up would be `./perl -Ilib t/op/sselect.t`.

Bounded independent signal check: run a small `select()` timeout under `strace`, for example `strace -tt -e pselect6 ./perl -Ilib -e 'pipe my $r,my $w; my $rin=""; vec($rin, fileno($r), 1)=1; select(my $rout=$rin, undef, undef, 2)'`, and confirm it blocks for about 2 seconds rather than spinning. If the 

[truncated]

Issue page: /issues/019dc07f-d19d-7cd0-8771-a7f51e5fec2b. Issue JSON: /v1/issues/019dc07f-d19d-7cd0-8771-a7f51e5fec2b

postgres is stuck in a likely unclassified userspace loop: 7.61% of sampled CPU passed through next_uptodate_folio, with repeated thread backtraces show 1 thread(s) around 0x00007f322d29a7d2 in ?? () from target:<path>.

## 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): `./configure && make`, `meson setup build-fix && meson compile -C build-fix && meson test -C build-fix`, `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `postgresql-18` 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. 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. 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.

Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `./configure && make`, `meson setup build-fix && meson compile -C build-fix && meson test -C build-fix`, `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `postgresql-18` 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. 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 `postgresql-18` 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): `./configure && make`, `meson setup build-fix && meson compile -C build-fix && meson test -C build-fix`, `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, 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 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 the `postgres` postmaster around `WaitEventSetWait()` / `epoll_wait()` with `SIGUSR1` waking the latch and a child being cloned. The same evidence says the sampled process was sleeping in `do_epoll_wait`, with only `0.6%` total CPU across 9 postgres processes and `0.5%` max per process. The profiler hotspot is mostly kernel-side (`next_uptodate_folio`) and the loop classifier confidence is low (`0.42`), so this does not currently identify a PostgreSQL runaway loop.

## Evidence Confidence
inferred

## Proposed Subject
No source patch yet: treat this as a diagnosis/report plan for a weak profiler signal in the postmaster wait loop, not an upstream-ready bug fix.

## Patch Plan
Do not edit files in this pass. The evidence matches normal PostgreSQL postmaster behavior: `SIGUSR1` wakes the postmaster latch, `WaitEventSetWait()` returns, `ServerLoop()` handles pending work, and `BackendStartup()` launches a child.

Before any future patch, collect extra evidence that proves repeated rapid wakeups or a specific PostgreSQL-side busy loop, such as a sustained `strace -ttT` showing near-zero-time `epoll_wait()` cycling, or a perf/backtrace sample resolving the `postgres` frame above `WaitEventSetWait()` to a specific loop.

If later evidence does show a real postmaster wakeup loop, keep changes local to `src/backend/postmaster/postmaster.c` or `src/backend/storage/ipc/waiteventset.c`, follow PostgreSQL conventions found here (`WaitEventSet`, `MyLatch`, `ResetLatch`, `closesocket`, `ereport`, postmaster child-slot helpers), and avoid awkward control flow such as a new `goto`; use bounded loop checks or existing helper paths instead.

No prior Fixer patch was found in the workspace (`git status` clean, no relevant Fixer markers), so there is nothing to improve or replace.

## Risks
A speculative patch here could slow connection handling, introduce latch races, or change signal semantics in the postmaster. The local latch documentation explicitly warns about reset/check ordering, so any future edit must preserve the established `WaitLatch`/`WaitEventSet` pattern.

## Validation
Before reporting only a focused check, try the project-level entrypoint from the workspace root:

`./configure && make`

If that fails due to missing dependencies or generated files, record the exact failure and then use the narrowest reproducible compile, likely a backend/postmaster or `waiteventset.c` build target if available.

Bounded independent evidence collection before editing: build locally, initialize a temporary cluster, start `postgres`, then run a short `timeout`-bounded `strace -f -ttT -e epoll_wait,read,clone,kill` while making one connection or reload. This should only be used to determine whether the observed signal is normal wakeup activity or a reproducible tight loop; do not classify as `reproduced` unless it actually shows the failure pattern.

## Patch Pass

Subject: Diagnose weak postmaster wait-loop profiler signal

## Commit Message
No source change was made. The collected perf, strace, and `/proc` evidence points to a normal postmaster wait/wakeup path: the postmaster was sleeping in `epoll_wait()`, received `SIGUSR1`, woke its latch, launched a child process, and went back to waiting. The reported CPU signal is low and mostly kernel-side, so it is not enough to justify an upstream PostgreSQL source patch.

## Evidence Confidence
inferred

## Issue Connection
The collected signal was a Fixer profiler report for `postgres` with `next_uptodate_folio` at 10.15% of samples, a backtrace through `WaitEventSetWait()` and `epoll_wait()`, and `/proc` state `S (sleeping)` with `wchan` `do_epoll_wait`. The process group CPU was also low: 0.6% total across 9 postgres processes.

The cautious code-level inference is that this is normal postmaster event-loop activity, not a proven runaway loop. PostgreSQL’s postmaster uses a `WaitEventSet`, which is PostgreSQL’s wrapper for waiting on latches and sockets, and `MyLatch`/`ResetLatch` to handle signal-driven wakeups without polling races. The strace excerpt shows `SIGUSR1`, a latch wake via `SIGURG`, a readiness read, `clone()`, and then another `epoll_wait()`, matching that design.

I made no source change. This follows the saved plan because the evidence remained indirect and did not identify a PostgreSQL-side busy loop. The expected effect is to avoid landing a speculative upstream patch that could disturb race-sensitive latch ordering in the postmaster. A stronger report would need sustained traces showing rapid zero-time `epoll_wait()` cycling or a resolved PostgreSQL frame above `WaitEventSetWait()`.

Style/convention check: `.github/CONTRIBUTING.md` points to PostgreSQL developer guidance, `README.md` points to the build docs, and the touched subsystem convention is to use `WaitEventSet`, `MyLatch`, `ResetLatch`, `ereport`, and socket wrappers such as `closesocket`. No new helper or platform API was introduced.

## Git Add Paths
None

## Validation
`./configure && make -j2` from the workspace root: passed.

Bounded independent reproduction attempt was blocked by the execution environment. I attempted to create a temporary cluster for a short strace-based postmaster wakeup check, but running as an unprivileged database owner was not available: `runuser -u nobody -- ...` failed with `runuser: cannot set groups: Operation not permitted`. Running `initdb` as the current user also failed as expected with `initdb: error: cannot be run as root`.

After validation, I ran `make distclean` to remove build products generated by the build. `git status --short` is clean.

## Review Pass 1

RESULT: ok

No source diff is present against the original snapshot, and `git status --short` is clean. The author correctly classified the evidence as `inferred`, avoided a speculative PostgreSQL source patch, and explained the likely normal postmaster `WaitEventSet` / latch wakeup path without inventing a reproducer.

Validation is acceptable for a no-patch diagnosis: project-level `./configure && make -j2` was attempted and passed, and the bounded runtime reproduction attempt reported the environment blocker instead of claiming reproduction.

## Plan Pass

## Problem
Fixer observed the `postgres` postmaster around `WaitEventSetWait()` / `epoll_wait()` with `SIGUSR1` waking the latch and a child being cloned. The same evidence says the sampled process was sleeping in `do_epoll_wait`, with only `0.6%` total CPU across 9 postgres processes and `0.5%` max per process. The profiler hotspot is mostly kernel-side (`next_uptodate_folio`) and the loop classifier confidence is low (`0.42`), so this does not currently identify a PostgreSQL runaway loop.

## Evidence Confidence
inferred

## Proposed Subject
No source patch yet: treat this as a diagnosis/report plan for a weak profiler signal in the postmaster wait loop, not an upstream-ready bug fix.

## Patch Plan
Do not edit files in this pass. The evidence matches normal PostgreSQL postmaster behavior: `SIGUSR1` wakes the postmaster latch, `WaitEventSetWait()` returns, `ServerLoop()` handles pending work, and `BackendStartup()` launches a child.

Before any future patch, collect extra evidence that proves repeated rapid wakeups or a specific PostgreSQL-side busy loop, such as a sustained `strace -ttT` showing near-zero-time `epoll_wait()` cycling, or a perf/backtrace sample resolving the `postgres` frame above `WaitEventSetWait()` to a specific loop.

If later evidence does show a real postmaster wakeup loop, keep changes local to `src/backend/postmaster/postmaster.c` or `src/backend/storage/ipc/waiteventset.c`, follow PostgreSQL conventions found here (`WaitEventSet`, `MyLatch`, `ResetLatch`, `closesocket`, `ereport`, postmaster child-slot helpers), and avoid awkward control flow such as a new `goto`; use bounded loop checks or existing helper paths instead.

No prior Fixer patch was found in the workspace (`git status` clean, no relevant Fixer markers), so there is nothing to improve or replace.

## Risks
A speculative patch here could slow connection handling, introduce latch races, or change signal semantics in the postmaster. The local latch documentation explicitly warns about reset/check ordering, so any future edit must preserve the established `WaitLatch`/`WaitEventSet` pattern.

## Validation
Before reporting only a focused check, try the project-level entrypoint from the workspace root:

`./configure && make`

If that fails due to missing dependencies or generated files, record the exact failure and then use the narrowest reproducible compile, 

[truncated]

Issue page: /issues/019dcfd5-049e-7413-b236-3e76a8fcb568. Issue JSON: /v1/issues/019dcfd5-049e-7413-b236-3e76a8fcb568

dockerd is stuck in a likely socket churn loop: 100.00% of sampled CPU passed through do_epoll_wait, with repeated thread backtraces show 1 thread(s) around 0x000056124fea7023 in ?? () and 1 thread(s) around 0x000056124fea7023 in ?? ().

## 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.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `docker.io` 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. 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. 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.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `docker.io` 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. 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 `docker.io` upstream patch, not just a Debian-local workaround. 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 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
`dockerd` was flagged by Fixer as “runaway CPU / socket churn,” but the bundle shows a sleeping daemon with max CPU 0.1%, `wchan=futex_do_wait`, many futex waits, and one `epoll_pwait` hot path in the kernel. The backtraces are unsymbolized, and the referenced raw artifacts are not present on disk, so the evidence does not identify a Moby source-level loop or a specific caller.

## Evidence Confidence
inferred

## Proposed Subject
No source patch yet: defer until the profile can be tied to symbolized Moby code or a reproducible daemon behavior.

## Patch Plan
- Do not edit in this pass. A source change would be speculative because the evidence only observes blocked/sleeping wait paths, not confirmed churn in `dockerd` code.
- Improve/replace no prior Fixer patch: `git status` and `git diff --stat` are clean, and I found no existing patch artifact to revise.
- If more evidence is collected before editing, start from the `dockerd` entrypoint in `engine/cmd/dockerd/docker.go` and `engine/cmd/dockerd/daemon.go`, then inspect only the implicated path: API listener setup via `daemon/listeners`, containerd client setup in `daemon/daemon.go`, or event stream handling in `libcontainerd/remote/client.go`.
- Follow Moby conventions from `engine/CONTRIBUTING.md` and `engine/TESTING.md`: `gofmt -s`, focused unit tests for bug fixes, `containerd/log` via `log.G(ctx)`, wrapped errors with existing `pkg/errors` style, existing `context.WithTimeout`/timer patterns, `listeners.Init` for socket activation, and `process.Alive`/`pidfile` helpers in the supervisor. Avoid adding raw syscall/process logic or awkward control flow such as avoidable `goto`.

## Risks
- Treating normal Go runtime futex waits or HTTP/gRPC epoll blocking as a daemon bug could produce a misleading upstream patch.
- The installed package version in evidence is `28.5.2+dfsg3-2`, while the workspace is `28.5.2+dfsg4-1`; the signal may already differ.
- Without symbols or raw `strace` artifacts, the “socket-churn” label is weaker than the observed low CPU and sleeping process state.

## Validation
- First reproducible project entrypoint from the workspace root: `cd engine && make test-unit`.
- If later evidence points to a subsystem, run focused tests after that, e.g. `cd engine && TESTDIRS=./libcontainerd/... make test-unit` or the relevant package under `cmd/dockerd`/`daemon/listeners`.
- Bounded independent reproduction attempt before any patch: run a locally built `dockerd` in an isolated temp root/exec-root with the same shape of options where safe, capture `SIGUSR1` goroutine dump using the existing `daemon.setupDumpStackTrap`, and sample `strace -f -c` briefly to see whether a real rapid socket retry loop appears. Do not claim reproduced unless that command shows repeated active retry behavior.

## Patch Pass

Subject: No source patch for inferred dockerd wait profile

## Commit Message
The collected evidence most likely captures an idle or blocked `dockerd` rather than a confirmed Moby busy loop. Perf sampled `do_epoll_wait`, strace showed mostly unfinished futex/nanosleep/epoll waits, and `/proc` reported the process as sleeping with only 0.1% CPU. Because the stack frames are unsymbolized and the raw investigation files are unavailable, there is no upstreamable source change to make safely.

I followed the saved plan and left the tree unchanged.

## Evidence Confidence
inferred

## Issue Connection
The exact collected signal is a Fixer profile of `/usr/sbin/dockerd -H fd:// --containerd=/run/containerd/containerd.sock` where the hot kernel symbol was `do_epoll_wait`, the top syscalls were futex/nanosleep/epoll waits, and `/proc` showed `State: S (sleeping)` with `wchan: futex_do_wait` and max CPU at 0.1%.

The cautious inference is that this is not enough to identify a Moby source-level socket churn loop. The evidence lacks symbolized Go frames and the referenced raw artifacts directory is missing, so patching `cmd/dockerd`, `daemon/listeners`, or `libcontainerd` would invent a cause not proven by the bundle.

No source change was made. I inspected Moby contribution/testing docs and the relevant daemon/containerd paths; local conventions include `log.G(ctx)` for logging, `listeners.Init` for socket activation, `pidfile`/`process.Alive` helpers for process state, and existing `context.WithTimeout`/timer patterns.

The expected effect is no behavioral change; this avoids shipping a speculative patch. A pull-request-ready fix needs stronger evidence, such as a symbolized goroutine dump, available raw strace/perf artifacts, or a reproducer showing active retry behavior in a specific daemon path.

## Git Add Paths
None

## Validation
- `cd engine && make test-unit`
  Blocked before tests: Docker build setup failed with `ERROR: mkdir /root/.docker: read-only file system`.

- `cd engine && go test ./libcontainerd/remote ./libcontainerd/supervisor ./daemon/listeners ./cmd/dockerd`
  Blocked by the Debian source module layout: package imports could not be resolved with `import lookup disabled by -mod=readonly`; it also reported `GOCACHE is not defined`.

- `test -d /var/lib/fixer/investigations/2026-05-06T17-53-09.302368672+00-00-dockerd-b732bcc6a3ff ...`
  Result: `missing investigation artifact directory`.

- Independent reproduction attempt: `timeout 10 strace -f -e trace=futex,epoll_pwait,nanosleep,recvmsg -c /usr/sbin/dockerd --validate -H fd:// --containerd=/run/containerd/containerd.sock`
  Blocked by sandbox ptrace restrictions: `PTRACE_TRACEME: Operation not permitted` and `ptrace(PTRACE_SEIZE, 5): Operation not permitted`.

- Safe smoke check without tracing: `/usr/sbin/dockerd --validate -H fd:// --containerd=/run/containerd/containerd.sock`
  Result: `configuration OK`; this did not reproduce the collected wait/profile signal.

## 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 presenting a speculative source patch. The response includes the required sections, uses an allowed evidence confidence value, explains why the profiler/strace evidence is insufficient for an upstream code change, names relevant Moby conventions/helpers inspected, and reports the project-level validation attempt plus exact blockers.

The no-patch diagnosis is consistent with the bundle: low CPU, sleeping process state, futex/epoll wait signals, unsymbolized frames, and unavailable raw artifacts do not identify a concrete Moby code defect.

## Plan Pass

## Problem
`dockerd` was flagged by Fixer as “runaway CPU / socket churn,” but the bundle shows a sleeping daemon with max CPU 0.1%, `wchan=futex_do_wait`, many futex waits, and one `epoll_pwait` hot path in the kernel. The backtraces are unsymbolized, and the referenced raw artifacts are not present on disk, so the evidence does not identify a Moby source-level loop or a specific caller.

## Evidence Confidence
inferred

## Proposed Subject
No source patch yet: defer until the profile can be tied to symbolized Moby code or a reproducible daemon behavior.

## Patch Plan
- Do not edit in this pass. A source change would be speculative because the evidence only observes blocked/sleeping wait paths, not confirmed churn in `dockerd` code.
- Improve/replace no prior Fixer patch: `git status` and `git diff --stat` are clean, and I found no existing patch artifact to revise.
- If more evidence is collected before editing, start from the `dockerd` entrypoint in `engine/cmd/dockerd/docker.go` and `engine/cmd/dockerd/daemon.go`, then inspect only the implicated path: API listener setup via `daemon/listeners`, containerd client setup in `daemon/daemon.go`, or event stream handling in `libcontainerd/remote/client.go`.
- Follow Moby conventions from `engine/CONTRIBUTING.md` and `engine/TESTING.md`: `gofmt -s`, focused unit tests for bug fixes, `containerd/log` via `log.G(ctx)`, wrapped errors with existing `pkg/errors` style, existing `context.WithTimeout`/timer patterns, `listeners.Init` for socket activation, and `process.Alive`/`pidfile` helpers in the supervisor. Avoid adding raw syscall/process logic or awkward control flow such as avoidable `goto`.

## Risks
- Treating normal Go runtime futex waits or HTTP/gRPC epoll blocking as a daemon bug could produce a misleading upstream patch.
- The installed package version in evidence is `28.5.2+dfsg3-2`, while the workspace is `28.5.2+dfsg4-1`; the signal may already differ.
- Without symbols or raw `strace` artifacts, the “socket-churn” label is weaker than the observed low CPU and sleeping process state.

## Validation
- First reproducible project entrypoint from the workspace root: `cd engine && make test-unit`.
- If later evidence points to a subsystem, run focused tests after that, e.g. `cd engine && TESTDIRS=./libcontainerd/... make test-unit` or the relevant package under `cmd/dockerd`/`daemon

[truncated]

Issue page: /issues/019dee60-21e4-7d90-84c6-ac0d23f839ad. Issue JSON: /v1/issues/019dee60-21e4-7d90-84c6-ac0d23f839ad

dockerd is stuck in a likely socket churn loop: 53.32% of sampled CPU passed through __futex_hash, with repeated thread backtraces show 1 thread(s) around 0x000056124fea7023 in ?? () and 1 thread(s) around 0x000056124fea7023 in ?? ().

## 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.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `docker.io` 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. 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. 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.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `docker.io` 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. 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 `docker.io` upstream patch, not just a Debian-local workaround. 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 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/dockerd -H fd:// --containerd=/run/containerd/containerd.sock` with many sleeping threads in futex waits and a 3-second perf hot path in kernel `__futex_hash`. The JSON also labels the sample as `socket-churn`, but the included syscall excerpt is mostly `futex(... FUTEX_WAIT_PRIVATE ...)` plus a few `waitid(P_PIDFD, ...)`, and reported CPU was only `0.1%`. The raw artifact paths referenced by the bundle are not present, so the richer strace/backtrace files cannot be re-read.

## Evidence Confidence
inferred

## Proposed Subject
No source patch yet: gather symbolized daemon evidence before changing Moby daemon code.

## Patch Plan
Do not edit in this pass. The current evidence is indirect profiler data from a low-CPU sleeping `dockerd`, not a reproduced user-visible failure or a localized source bug.

Before any source patch, collect extra evidence that can connect the observed futex/socket signal to a daemon subsystem: a symbolized goroutine dump or pprof profile from `dockerd`, plus a bounded strace sample that includes syscall counts, not just the excerpt. If that identifies a specific loop or unbounded goroutine/thread creation path, patch that local subsystem.

Entry-point investigation starts from `engine/cmd/dockerd/docker.go` and `engine/cmd/dockerd/daemon.go`, then follows daemon listener/containerd code. I found no prior Fixer patch in the workspace (`git diff` empty), so there is nothing to replace. Relevant conventions/helpers to follow if a patch becomes justified: `engine/CONTRIBUTING.md` requires tests and `gofmt -s`; daemon logging uses `log.G(ctx)` from `containerd/log`; error context uses `github.com/pkg/errors`; listener setup goes through `engine/daemon/listeners.Init` and `docker/go-connections/sockets`; containerd dialing already uses `containerd.New`, `dialer.ContextDialer`, gRPC backoff settings, and context timeouts. Avoid awkward cleanup flow such as avoidable `goto`; use bounded cancellation/defer patterns already used in `daemon.go`.

## Risks
A source patch from the current bundle would be speculative. Many futex waits and `waitid(P_PIDFD, ...)` entries can be normal for a Go daemon with goroutines and child-process watchers, especially with `dockerd` sleeping and near-zero CPU. The `socket-churn` label conflicts with the visible syscall excerpt, so treating it as confirmed socket retry behavior would risk an upstream-unacceptable fix.

## Validation
First reproducible workspace entrypoint: from `engine/`, try the project build/test wrapper entrypoint documented in `engine/hack/README.md`, e.g. `make test` or the focused equivalent if available in this Debian source checkout.

Before any focused leaf compile, perform one cheap independent evidence attempt: run a local `dockerd --validate --config-file <tempfile>` or another non-invasive daemon command to confirm the built command path works, then, only if a running daemon is safely available, capture a short `strace -c -f -p <dockerd-pid>` or goroutine dump/pprof sample to see whether futex/socket churn is actually reproducible. Do not claim `reproduced` unless that command shows the same failure signal.

## Patch Pass

Subject: Diagnose dockerd futex profile without patch

## Commit Message
No source change was made. The collected evidence points to a sleeping Go daemon with many runtime threads blocked in futex waits, not to a localized Moby retry loop or socket bug that is safe to patch from source alone.

The likely root cause is normal or workload-dependent Go/runtime blocking behavior: futex is the Linux primitive used by Go synchronization, and the trace also shows `waitid(P_PIDFD, ...)` child-process waits. That conflicts with the bundle’s `socket-churn` label and needs a symbolized goroutine dump or syscall-count trace before an upstreamable code change.

## Evidence Confidence
inferred

## Issue Connection
The collected signal is a `dockerd` process in `S (sleeping)` state with 185 threads, `0.1%` total CPU, a perf hot path in kernel `__futex_hash`, and a 5-second strace excerpt dominated by `FUTEX_WAIT_PRIVATE` plus a few `waitid(P_PIDFD, ...)` calls.

The cautious code-level inference is that this is Go runtime synchronization or process-wait blocking, not a demonstrated busy loop in the daemon listener, containerd client, or API server. The raw artifact paths in the bundle are not present locally, so I could not inspect the full strace, file descriptors, or symbolized backtraces. No source diff was left because an inferred patch would not be pull-request-ready.

I followed the saved plan and did not change course. I inspected the daemon entrypoint and nearby helpers: `engine/cmd/dockerd/docker.go`, `engine/cmd/dockerd/daemon.go`, `engine/daemon/daemon.go`, and `engine/daemon/listeners/listeners_linux.go`. Relevant local conventions are `log.G(ctx)` for logging, `github.com/pkg/errors` for contextual errors, `listeners.Init` plus `docker/go-connections/sockets` for listener setup, and containerd client setup through `containerd.New`, `dialer.ContextDialer`, gRPC backoff, and explicit timeouts. `engine/CONTRIBUTING.md` requires tests and `gofmt -s` for actual Go changes.

The expected effect is that no speculative daemon behavior change is proposed until stronger evidence identifies a concrete Moby subsystem.

## Git Add Paths
None

## Validation
`timeout 60s make -C engine test` from the workspace root failed before tests: Docker buildx tried to create `/root/.docker`, but the filesystem is read-only (`ERROR: mkdir /root/.docker: read-only file system`).

Focused fallback `go test ./cmd/dockerd -run 'TestLoadListenerNoAddr|TestLoadDaemonCliConfigWithoutOverriding' -count=1` failed because module lookup is disabled and this checkout did not use vendoring by default; it also reported no usable build cache. Retrying with `GOCACHE=/tmp/fixer-gocache GOFLAGS=-mod=vendor` failed due inconsistent vendoring between `engine/go.mod` and `engine/vendor/modules.txt`.

Independent reproduction attempt: `pgrep -a dockerd` produced no running daemon, so I could not safely attach `strace` or collect a goroutine dump. The raw artifact directory from `evidence.json` is also absent.

## Review Pass 1

RESULT: ok

No blocking issues found. The workspace has no source diff, which matches the `inferred` evidence level and the author’s no-patch diagnosis. The response includes the required `## Evidence Confidence` section with an allowed value, does not claim reproduction, reports the project-level validation attempt and exact blocker, and explains why the profiler/strace evidence is insufficient for an upstreamable source patch.

The author also names the relevant Moby conventions/helpers inspected (`log.G(ctx)`, `github.com/pkg/errors`, `listeners.Init`, `docker/go-connections/sockets`, containerd dialer/backoff/timeouts) and avoids inventing a user-visible failure beyond the collected futex/perf signal.

## Plan Pass

## Problem
Fixer observed `/usr/sbin/dockerd -H fd:// --containerd=/run/containerd/containerd.sock` with many sleeping threads in futex waits and a 3-second perf hot path in kernel `__futex_hash`. The JSON also labels the sample as `socket-churn`, but the included syscall excerpt is mostly `futex(... FUTEX_WAIT_PRIVATE ...)` plus a few `waitid(P_PIDFD, ...)`, and reported CPU was only `0.1%`. The raw artifact paths referenced by the bundle are not present, so the richer strace/backtrace files cannot be re-read.

## Evidence Confidence
inferred

## Proposed Subject
No source patch yet: gather symbolized daemon evidence before changing Moby daemon code.

## Patch Plan
Do not edit in this pass. The current evidence is indirect profiler data from a low-CPU sleeping `dockerd`, not a reproduced user-visible failure or a localized source bug.

Before any source patch, collect extra evidence that can connect the observed futex/socket signal to a daemon subsystem: a symbolized goroutine dump or pprof profile from `dockerd`, plus a bounded strace sample that includes syscall counts, not just the excerpt. If that identifies a specific loop or unbounded goroutine/thread creation path, patch that local subsystem.

Entry-point investigation starts from `engine/cmd/dockerd/docker.go` and `engine/cmd/dockerd/daemon.go`, then follows daemon listener/containerd code. I found no prior Fixer patch in the workspace (`git diff` empty), so there is nothing to replace. Relevant conventions/helpers to follow if a patch becomes justified: `engine/CONTRIBUTING.md` requires tests and `gofmt -s`; daemon logging uses `log.G(ctx)` from `containerd/log`; error context uses `github.com/pkg/errors`; listener setup goes through `engine/daemon/listeners.Init` and `docker/go-connections/sockets`; containerd dialing already uses `containerd.New`, `dialer.ContextDialer`, gRPC backoff settings, and context timeouts. Avoid awkward cleanup flow such as avoidable `goto`; use bounded cancellation/defer patterns already used in `daemon.go`.

## Risks
A source patch from the current bundle would be speculative. Many futex waits and `waitid(P_PIDFD, ...)` entries can be normal for a Go daemon with goroutines and child-process watchers, especially with `dockerd` sleeping and near-zero CPU. The `socket-churn` label conflicts with the visible syscall excerpt, so treating it as confirmed socket

[truncated]

Issue page: /issues/019dfdfe-8133-7900-be11-727e24964bda. Issue JSON: /v1/issues/019dfdfe-8133-7900-be11-727e24964bda

sshd-session is stuck in a likely unclassified userspace loop: 9.84% of sampled CPU passed through xas_start, with repeated thread backtraces show 1 thread(s) around 0x00007f145209a7d2 in ?? () from target:<path>.

## 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): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `openssh` 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. 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. 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.

Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `openssh` 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. 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 `openssh` 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): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, 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 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 `sshd-session: gis [priv]` samples around `poll()/restart_syscall`, with unresolved frames and low aggregate CPU (`10` processes, `1.3%` total, max `1.0%`). The command title indicates the privileged privsep monitor, and nearby OpenSSH code shows that monitor normally blocks indefinitely in `monitor_read()` using `poll(..., -1)` while waiting for child/log messages.

## Evidence Confidence
inferred

## Proposed Subject
No source patch yet: collect symbolized/runtime evidence before changing OpenSSH’s privsep monitor or session event loop.

## Patch Plan
Do not edit files in this pass. The current evidence is profiler-only and does not prove a userspace runaway loop: the sampled process is sleeping in `poll_schedule_timeout`, and the relevant `[priv]` monitor path is expected to wait in `monitor.c:monitor_read()`.

Before any patch, collect one of:
- a symbolized backtrace/perf profile for the exact Debian `sshd-session` build, or
- a bounded local reproduction showing repeated immediate `poll()/ppoll()` wakeups or sustained CPU in OpenSSH code.

If later evidence implicates the session event loop, inspect `serverloop.c` first and use existing timeout helpers from `misc.c` (`ptimeout_init`, `ptimeout_deadline_*`, `ptimeout_get_tsp`) instead of ad hoc time arithmetic. If it implicates privsep monitor IO, follow local conventions in `monitor.c`: `atomicio`, `sshbuf`, `fatal_f`/`debug_f`, and simple bounded control flow without avoidable `goto`.

No prior Fixer patch for `90058` or this runaway/poll signal was found in the workspace. Contribution docs are limited to `README.md`; it points to normal portable OpenSSH `./configure`, `make`, and `make tests` workflow.

## Risks
A speculative source patch would likely change correct blocking behavior in the privileged monitor and could destabilize authentication/session handling. Treating `poll(..., -1)` as a bug would be especially risky because it is the intended idle state for `[priv]`.

## Validation
First try the project-level entrypoint from the workspace root after any future edit:

```sh
./configure && make
```

If that fails due to missing dependencies or generated files, report the exact failing command and reason, then run the narrowest relevant check.

Bounded independent evidence attempt before editing: build with symbols if needed, start a local test `sshd-session` path through the OpenSSH regress harness, and run a short syscall/profile capture against the privsep monitor PID, e.g. `timeout 10s strace -tt -e poll,ppoll,restart_syscall -p <pid>`. Do not claim reproduced unless this shows repeated immediate wakeups or measurable CPU in OpenSSH code.

## Patch Pass

Subject: diagnosis: leave sshd-session privsep poll sample unpatched

## Commit Message
No source change was made. The collected evidence points at an `sshd-session` privileged separation monitor, which is expected to sleep in `poll()` while waiting for its unprivileged child, but it does not identify a concrete OpenSSH loop or erroneous wakeup path to patch safely.

## Evidence Confidence
inferred

## Issue Connection
The collected signal is a Fixer perf/strace/proc snapshot for `sshd-session: gis [priv]`: one process was sleeping in `poll_schedule_timeout`, strace captured only `restart_syscall(<... resuming interrupted poll ...>`, and the profile target showed low aggregate CPU across multiple `sshd-session` processes.

The cautious code-level inference is that this is the privileged separation monitor. In OpenSSH, the post-auth monitor loops in `monitor_child_postauth()` and blocks in `monitor_read()` using `poll(..., -1)` until monitor or log fds have data. That blocking state matches the captured `/proc` state and syscall stack. The raw investigation files are not present locally, and the installed binary is stripped, so the unresolved frames could not be tied to a faulty source line.

I followed the saved plan and made no source change. A patch to alter the monitor wait loop, or the session `ppoll()` path in `serverloop.c`, would be speculative without evidence of repeated immediate wakeups or sustained CPU in OpenSSH code.

Because there is no source patch, there is no runtime effect. The expected next step is an upstream bug report or renewed capture with symbols/live syscall evidence. Relevant local conventions found: `monitor.c` uses `sshbuf`, `atomicio`, `fatal_f`/`debug_f`; `serverloop.c` uses the `ptimeout_*` helpers from `misc.c`; allocation wrappers include `xmalloc`/`xrecallocarray`. Contribution/build guidance was limited to `README.md`.

## Git Add Paths
None

## Validation
`./configure && make` from the workspace root failed before build:

```text
configure: error: ./configure.ac newer than configure, run autoreconf
```

`Makefile` and `config.h` are absent, so I did not run a focused compile for a no-patch diagnosis. I ran `make -n sshd-session`; it only printed the dry-run compile line and did not validate a build.

Bounded reproduction/evidence attempt: I checked for a live `sshd-session: ... [priv]` process to strace. An initial attach attempt was blocked by ptrace permissions, and a follow-up `pgrep -af 'sshd-session:.*\[priv\]'` found no live target. I also tried `addr2line` against `/usr/lib/openssh/sshd-session`, but the binary is stripped and returned only `??:0`.

## Review Pass 1

RESULT: ok

No source changes are present in the git diff, and the author’s no-patch diagnosis is consistent with the evidence level. The evidence is indirect/profiler-based, `## Evidence Confidence` is correctly set to `inferred`, and the response avoids presenting a speculative OpenSSH change as a confirmed fix.

Validation is adequately reported for a no-patch pass: the project-level `./configure && make` was attempted and the exact blocker was included. The author also documented the blocked live-process reproduction attempt and named relevant OpenSSH local helpers/conventions (`sshbuf`, `atomicio`, `fatal_f`/`debug_f`, `ptimeout_*`, `xmalloc`/`xrecallocarray`).

## Plan Pass

## Problem
Fixer observed `sshd-session: gis [priv]` samples around `poll()/restart_syscall`, with unresolved frames and low aggregate CPU (`10` processes, `1.3%` total, max `1.0%`). The command title indicates the privileged privsep monitor, and nearby OpenSSH code shows that monitor normally blocks indefinitely in `monitor_read()` using `poll(..., -1)` while waiting for child/log messages.

## Evidence Confidence
inferred

## Proposed Subject
No source patch yet: collect symbolized/runtime evidence before changing OpenSSH’s privsep monitor or session event loop.

## Patch Plan
Do not edit files in this pass. The current evidence is profiler-only and does not prove a userspace runaway loop: the sampled process is sleeping in `poll_schedule_timeout`, and the relevant `[priv]` monitor path is expected to wait in `monitor.c:monitor_read()`.

Before any patch, collect one of:
- a symbolized backtrace/perf profile for the exact Debian `sshd-session` build, or
- a bounded local reproduction showing repeated immediate `poll()/ppoll()` wakeups or sustained CPU in OpenSSH code.

If later evidence implicates the session event loop, inspect `serverloop.c` first and use existing timeout helpers from `misc.c` (`ptimeout_init`, `ptimeout_deadline_*`, `ptimeout_get_tsp`) instead of ad hoc time arithmetic. If it implicates privsep monitor IO, follow local conventions in `monitor.c`: `atomicio`, `sshbuf`, `fatal_f`/`debug_f`, and simple bounded control flow without avoidable `goto`.

No prior Fixer patch for `90058` or this runaway/poll signal was found in the workspace. Contribution docs are limited to `README.md`; it points to normal portable OpenSSH `./configure`, `make`, and `make tests` workflow.

## Risks
A speculative source patch would likely change correct blocking behavior in the privileged monitor and could destabilize authentication/session handling. Treating `poll(..., -1)` as a bug would be especially risky because it is the intended idle state for `[priv]`.

## Validation
First try the project-level entrypoint from the workspace root after any future edit:

```sh
./configure && make
```

If that fails due to missing dependencies or generated files, report the exact failing command and reason, then run the narrowest relevant check.

Bounded independent evidence attempt before editing: build with symbols if needed, start a local test `sshd-sessi

[truncated]

Issue page: /issues/019dfdb9-5421-7070-98e0-7dd4cb5e6f6e. Issue JSON: /v1/issues/019dfdb9-5421-7070-98e0-7dd4cb5e6f6e

dockerd is stuck in a likely socket churn loop: 100.00% of sampled CPU passed through __schedule, with repeated thread backtraces show 1 thread(s) around 0x000056124fea7023 in ?? () and 1 thread(s) around 0x000056124fea7023 in ?? ().

## 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.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `docker.io` 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. 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. 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.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `docker.io` 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. 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 `docker.io` upstream patch, not just a Debian-local workaround. 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 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 `dockerd` with many sleeping threads in futex waits, `nanosleep`, and a few `waitid(P_PIDFD, ...)` calls. The bundle labels this “socket-churn/runaway”, but the same evidence reports only `0.1%` CPU and kernel time under `__schedule`, so this is not enough to identify a Moby source bug or a precise hot loop.

## Evidence Confidence
inferred

## Proposed Subject
No source patch yet: collect symbolized `dockerd` goroutine/profile evidence before changing Moby code.

## Patch Plan
- Do not edit files in this pass. The current evidence is profiler-only/indirect and the raw artifacts referenced by `evidence.json` are not available in the workspace.
- Investigate from the `dockerd` entrypoint first: `engine/cmd/dockerd/docker.go`, daemon startup/listener setup, then `engine/libcontainerd/remote/client.go` and `engine/libcontainerd/supervisor/remote_daemon.go` because the observed `waitid(P_PIDFD, ...)` may relate to Go `os/exec` child reaping around supervised containerd or runtime processes.
- If later evidence identifies a concrete Moby loop, follow local conventions: `log.G(ctx)` for logging, `context.WithTimeout` for bounded waits, existing `pkg/process`/`pkg/pidfile` helpers for process state, and `libcontainerd/queue.Queue` event ordering rather than inventing new primitives.
- Avoid awkward control flow such as `goto`; any mitigation should be a bounded retry/timer/select structure matching nearby code.
- No prior Fixer patch for this finding was found in `debian/patches` or `.pc`; nothing should be improved or replaced yet.
- Maintainer-facing explanation should state that Fixer observed a sleeping/futex-heavy daemon sample, not an independently reproduced user-visible failure.

## Risks
- A speculative patch could mask a kernel/runtime/containerd behavior rather than fix Moby.
- The evidence conflicts with the “runaway CPU” title because sampled CPU was low.
- The unsymbolized backtrace addresses cannot be tied to a source line from the workspace alone.

## Validation
- First reproducible workspace entrypoint before any focused check: `debian/rules build` or, for full package validation, `dpkg-buildpackage -us -uc -b`.
- Upstream engine test entrypoint if a future engine patch is justified: from `engine/`, run `make test-unit` or `TESTDIRS=./libcontainerd/... TESTFLAGS='-run <focused-test>' hack/test/unit`.
- Bounded independent signal attempt: after a build, run an isolated temporary `dockerd` with `--data-root`, `--exec-root`, private unix socket, `--bridge=none`, and existing `/run/containerd/containerd.sock` for about 10-20 seconds, sample `ps`/`strace -c`/SIGUSR1 goroutine dump, then stop it. Only classify as reproduced if that command actually shows the same futex/nanosleep/waitid pattern with abnormal thread or CPU behavior.

## Patch Pass

Subject: Diagnose inconclusive dockerd futex sample

## Commit Message
No source patch was made. The collected `dockerd` evidence points to parked Go/runtime threads rather than a confirmed Moby hot loop: the process was sleeping, CPU was `0.1%`, the kernel stack was in futex wait, and the sampled hot symbol was scheduler idle time.

## Evidence Confidence
inferred

## Issue Connection
The collected signal is a `dockerd` process with 185 threads, many unfinished `futex(FUTEX_WAIT_PRIVATE, ...)` calls, some `nanosleep`, and a few `waitid(P_PIDFD, ...)` calls. `/proc` reported state `S (sleeping)`, `wchan=futex_do_wait`, and only `0.1%` CPU, so the likely root cause is not a proven busy socket churn loop but an idle or blocked Go daemon sample with child-process waiters.

I followed the saved plan and inspected the `dockerd` entrypoint plus the libcontainerd event and supervisor paths. The relevant local conventions/helpers are `log.G(ctx)` for logging, bounded `context.WithTimeout`, `pkg/pidfile`, `pkg/process`, and `libcontainerd/queue.Queue`; no relevant helper exposed a narrow correction for the observed sample. The raw investigation directory referenced by `evidence.json` is missing, and the gdb frames are unsymbolized, so there is no source line to patch safely.

The specific change made is none: leaving no source diff is intentional because this remains inferred profiler/strace evidence, and an inferred source patch would not be pull-request-ready. The expected effect is to avoid landing a speculative upstream change until stronger evidence, such as a symbolized goroutine dump or reproducible daemon trace, ties the futex/waitid pattern to a concrete Moby code path.

## Git Add Paths
None

## Validation
- `timeout 120s debian/rules build` from the workspace root failed immediately: `dh: error: unable to load addon golang: Can't locate Debian/Debhelper/Sequence/golang.pm`.
- Focused fallback `go test ./libcontainerd/queue` failed because `GOCACHE`/`HOME` were unset and module lookup was disabled.
- Focused fallback `HOME=/tmp GOCACHE=/tmp/go-build GOFLAGS=-mod=vendor go test ./libcontainerd/queue` failed because Debian’s source `go.mod` and `vendor/modules.txt` are inconsistent in this unpacked workspace.
- Independent reproduction attempt: started an isolated `/usr/sbin/dockerd` with temp `--data-root`, temp unix socket, `--storage-driver=vfs`, `--bridge=none`, and `/run/containerd/containerd.sock`, then attempted `strace -f -c`. It did not reproduce the signal: `dockerd` failed before startup with `setsockopt: operation not permitted` creating the unix socket, and `strace` attach was blocked by `ptrace(PTRACE_SEIZE): Operation not permitted`.
- Final tree check: `git status --short` and `git diff --stat` showed no changes.

## Review Pass 1

RESULT: ok

No source diff is present, and that matches the stated `inferred` confidence. The author did not leave a speculative patch for profiler/strace-only evidence, which is the correct outcome here.

The report includes the required sections, keeps `## Evidence Confidence` to an allowed single word, connects the observed futex/sleeping `dockerd` signal to the no-patch decision, names relevant local conventions/helpers, and reports a workspace-root validation attempt with the exact blocker before narrower checks. The independent reproduction attempt was also reported as blocked rather than claimed as reproduced.

## Plan Pass

## Problem
Fixer observed `dockerd` with many sleeping threads in futex waits, `nanosleep`, and a few `waitid(P_PIDFD, ...)` calls. The bundle labels this “socket-churn/runaway”, but the same evidence reports only `0.1%` CPU and kernel time under `__schedule`, so this is not enough to identify a Moby source bug or a precise hot loop.

## Evidence Confidence
inferred

## Proposed Subject
No source patch yet: collect symbolized `dockerd` goroutine/profile evidence before changing Moby code.

## Patch Plan
- Do not edit files in this pass. The current evidence is profiler-only/indirect and the raw artifacts referenced by `evidence.json` are not available in the workspace.
- Investigate from the `dockerd` entrypoint first: `engine/cmd/dockerd/docker.go`, daemon startup/listener setup, then `engine/libcontainerd/remote/client.go` and `engine/libcontainerd/supervisor/remote_daemon.go` because the observed `waitid(P_PIDFD, ...)` may relate to Go `os/exec` child reaping around supervised containerd or runtime processes.
- If later evidence identifies a concrete Moby loop, follow local conventions: `log.G(ctx)` for logging, `context.WithTimeout` for bounded waits, existing `pkg/process`/`pkg/pidfile` helpers for process state, and `libcontainerd/queue.Queue` event ordering rather than inventing new primitives.
- Avoid awkward control flow such as `goto`; any mitigation should be a bounded retry/timer/select structure matching nearby code.
- No prior Fixer patch for this finding was found in `debian/patches` or `.pc`; nothing should be improved or replaced yet.
- Maintainer-facing explanation should state that Fixer observed a sleeping/futex-heavy daemon sample, not an independently reproduced user-visible failure.

## Risks
- A speculative patch could mask a kernel/runtime/containerd behavior rather than fix Moby.
- The evidence conflicts with the “runaway CPU” title because sampled CPU was low.
- The unsymbolized backtrace addresses cannot be tied to a source line from the workspace alone.

## Validation
- First reproducible workspace entrypoint before any focused check: `debian/rules build` or, for full package validation, `dpkg-buildpackage -us -uc -b`.
- Upstream engine test entrypoint if a future engine patch is justified: from `engine/`, run `make test-unit` or `TESTDIRS=./libcontainerd/... TESTFLAGS='-run <focused-test>' hack/test/unit`.


[truncated]

Issue page: /issues/019de7d3-3c01-71f1-9dbd-ce696226a958. Issue JSON: /v1/issues/019de7d3-3c01-71f1-9dbd-ce696226a958

dockerd is stuck in a likely socket churn loop: 50.00% of sampled CPU passed through unresolved offset, with repeated thread backtraces show 1 thread(s) around 0x000056124fea7023 in ?? () and 1 thread(s) around 0x000056124fea7023 in ?? ().

## 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.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `docker.io` 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. 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. 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.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `docker.io` 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. 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 `docker.io` upstream patch, not just a Debian-local workaround. 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 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 an installed `/usr/sbin/dockerd` process started as `dockerd -H fd:// --containerd=/run/containerd/containerd.sock` with 185 threads, low CPU, sleeping state, and traces dominated by futex waits. The bundle labels the loop as “socket-churn,” but the included excerpts mostly show Go runtime futex waits and unresolved frames, not a specific Moby source path.

## Evidence Confidence
inferred

## Proposed Subject
No source patch yet: diagnose unresolved `dockerd` runtime/futex profile before changing Moby daemon code.

## Patch Plan
Do not edit code in this pass. The current evidence is not source-actionable enough for an upstream-quality patch: `/usr/sbin/dockerd` is stripped, raw artifact paths are unavailable in this workspace, and `go tool addr2line` maps sampled offsets to Go runtime/internal syscall frames rather than a stable `engine/daemon` caller.

If more evidence is collected before editing, first target the daemon entrypoint path `engine/cmd/dockerd/docker.go` and `engine/cmd/dockerd/daemon.go`, then daemon startup/container restore code in `engine/daemon/daemon.go`. Local conventions/helpers found: `github.com/containerd/log` via `log.G(ctx)`, `github.com/pkg/errors` wrapping, `pkg/pidfile`, `pkg/homedir`, `daemon/listeners`, `user.MkdirAllAndChown`, `golang.org/x/sync/semaphore`, and `errgroup.SetLimit` patterns. Follow Moby’s `gofmt -s` and unit-test expectations from `engine/CONTRIBUTING.md` and `engine/TESTING.md`.

No prior Fixer patch is present to replace; the workspace only has `Fixer baseline`, and it matches the original dfsg4 source aside from workspace metadata. Avoid speculative control-flow changes such as adding `goto` exits around daemon startup; if later evidence points to excessive goroutine fanout, prefer a bounded worker/errgroup or existing semaphore pattern.

## Risks
A patch based only on the current bundle would likely treat normal idle Go runtime futex waits as a daemon bug. The observed package version was `28.5.2+dfsg3-2`, while this workspace is `28.5.2+dfsg4`, so the sampled binary may not exactly match the prepared source. Attaching tracing to a live daemon can perturb timing and should stay bounded.

## Validation
Before any future focused check, try the reproducible package entrypoint from the workspace root: `DEB_BUILD_OPTIONS=nocheck dpkg-buildpackage -us -uc -b` or, for the upstream engine test entrypoint, `cd engine && ./hack/test/unit`.

Bounded independent reproduction attempt: if a disposable or local `dockerd` is running, collect `timeout 5s ps -o pid,stat,pcpu,nlwp,wchan -C dockerd` plus `timeout 5s strace -f -c -p "$(pidof dockerd)"` to confirm whether the current signal is actually socket churn or mostly futex sleep. Do not claim reproduced unless that command shows the same failure signal.

## Patch Pass

Subject: Diagnose unresolved dockerd futex profile

## Commit Message
No source change was made. The collected signal points to `dockerd` threads parked in Go runtime futex waits, but the evidence does not identify a Moby source-level loop or retry path that can be fixed safely.

I followed the saved plan. I inspected Moby contribution/testing docs and daemon code conventions, including `log.G(ctx)`, `github.com/pkg/errors`, `pkg/pidfile`, `daemon/listeners`, `user.MkdirAllAndChown`, and the existing `semaphore.NewWeighted` startup throttling pattern.

## Evidence Confidence
inferred

## Issue Connection
The collected signal is a sleeping `dockerd` process with 185 threads, low CPU, `/proc` scheduler data showing mostly voluntary switches, and `strace` excerpts dominated by unfinished `futex(FUTEX_WAIT_PRIVATE, ...)` calls. Although the bundle labels the profile as “socket-churn,” the shown syscall and stack excerpts are futex waits, and the sampled binary frames are unresolved.

The likely root cause of the collected signal is that the profiler sampled idle or parked Go runtime threads rather than a demonstrated Docker daemon socket retry loop. I did not find symbolized evidence tying the sampled frames to `engine/cmd/dockerd`, `engine/daemon`, listener setup, containerd dialing, or daemon startup restore code. The daemon startup code does use semaphores to bound parallel container work, but the current evidence does not show that path was active or pathological.

Because this remains indirect profiler evidence, I made no source change. The expected effect is to avoid landing a speculative upstream patch for a normal-looking futex wait profile without a source-specific failure signal.

## Git Add Paths
None

## Validation
`timeout 5s sh -c 'pid=$(pidof dockerd 2>/dev/null || true); if [ -z "$pid" ]; then echo "no dockerd pid"; exit 2; fi; ps -o pid,stat,pcpu,nlwp,wchan,cmd -p "$pid"; if command -v strace >/dev/null 2>&1; then timeout 5s strace -f -c -p "$pid"; else echo "strace not installed"; exit 3; fi'`
Result: blocked; no local `dockerd` pid was running, so I could not independently reproduce the futex/thread signal.

`DEB_BUILD_OPTIONS=nocheck dpkg-buildpackage -us -uc -b`
Result: blocked by unmet Debian build dependencies, starting with `dh-golang`, `golang-any`, `go-md2man`, and many Go library packages.

`git diff --stat`
Result: no source changes.

## Review Pass 1

RESULT: ok

The review passes. The workspace has no source changes relative to the original snapshot, and `patch-output.txt` correctly treats the evidence as `inferred` rather than forcing a speculative patch.

The author response includes the required sections, uses a valid evidence confidence value, does not claim reproduction, and reports both the bounded reproduction blocker (`no dockerd pid`) and the workspace-root build blocker (`dpkg-buildpackage` unmet build dependencies). It also names the relevant Moby conventions/helpers inspected and explains why the profiler/futex evidence is not source-actionable.

## Plan Pass

## Problem
Fixer observed an installed `/usr/sbin/dockerd` process started as `dockerd -H fd:// --containerd=/run/containerd/containerd.sock` with 185 threads, low CPU, sleeping state, and traces dominated by futex waits. The bundle labels the loop as “socket-churn,” but the included excerpts mostly show Go runtime futex waits and unresolved frames, not a specific Moby source path.

## Evidence Confidence
inferred

## Proposed Subject
No source patch yet: diagnose unresolved `dockerd` runtime/futex profile before changing Moby daemon code.

## Patch Plan
Do not edit code in this pass. The current evidence is not source-actionable enough for an upstream-quality patch: `/usr/sbin/dockerd` is stripped, raw artifact paths are unavailable in this workspace, and `go tool addr2line` maps sampled offsets to Go runtime/internal syscall frames rather than a stable `engine/daemon` caller.

If more evidence is collected before editing, first target the daemon entrypoint path `engine/cmd/dockerd/docker.go` and `engine/cmd/dockerd/daemon.go`, then daemon startup/container restore code in `engine/daemon/daemon.go`. Local conventions/helpers found: `github.com/containerd/log` via `log.G(ctx)`, `github.com/pkg/errors` wrapping, `pkg/pidfile`, `pkg/homedir`, `daemon/listeners`, `user.MkdirAllAndChown`, `golang.org/x/sync/semaphore`, and `errgroup.SetLimit` patterns. Follow Moby’s `gofmt -s` and unit-test expectations from `engine/CONTRIBUTING.md` and `engine/TESTING.md`.

No prior Fixer patch is present to replace; the workspace only has `Fixer baseline`, and it matches the original dfsg4 source aside from workspace metadata. Avoid speculative control-flow changes such as adding `goto` exits around daemon startup; if later evidence points to excessive goroutine fanout, prefer a bounded worker/errgroup or existing semaphore pattern.

## Risks
A patch based only on the current bundle would likely treat normal idle Go runtime futex waits as a daemon bug. The observed package version was `28.5.2+dfsg3-2`, while this workspace is `28.5.2+dfsg4`, so the sampled binary may not exactly match the prepared source. Attaching tracing to a live daemon can perturb timing and should stay bounded.

## Validation
Before any future focused check, try the reproducible package entrypoint from the workspace root: `DEB_BUILD_OPTIONS=nocheck dpkg-buildpackage -us -uc -b` or, for

[truncated]

Issue page: /issues/019de62e-e606-78f1-bad7-ba4238222379. Issue JSON: /v1/issues/019de62e-e606-78f1-bad7-ba4238222379

sshd-session is stuck in a likely socket churn loop: 21.96% of sampled CPU passed through native_flush_tlb_one_user, with repeated munmap x17, read x4, getpid x3.

## 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): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `openssh` 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. 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. 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.

Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `openssh` 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. 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 `openssh` 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): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, 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 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 `sshd-session: unknown [priv]` as a runaway/socket-churn process, but the evidence shows a sleeping preauth monitor in `poll()` with only 0.2% total CPU across three processes. The strace excerpt shows normal preauth failure teardown: child log messages forwarded to syslog, `wait4()` for the auth child, then PAM/library cleanup `munmap()` calls.

## Evidence Confidence
inferred

The bundle has profiler/strace excerpts, not an independent reproducer. The sampled stack is blocked in `poll_schedule_timeout`, and the syscall burst is short cleanup/logging activity. This is not strong enough for an upstream source patch claiming a confirmed OpenSSH bug.

## Proposed Subject
No source patch yet: diagnose likely false-positive `sshd-session` runaway report and require stronger evidence before changing OpenSSH monitor or logging behavior.

## Patch Plan
Do not edit files in this pass. A source patch would be speculative because the apparent hot path maps to existing intended code paths: `monitor_read()` polls the monitor/log fds, `monitor_read_log()` forwards child logs through `sshlogdirect()`, and `log.c` intentionally uses OpenSSH logging wrappers around syslog.

If stronger evidence is collected later, target the smallest relevant area: preauth monitor/log forwarding in `monitor.c`, `monitor_wrap.c`, `log.c`, and PAM max-tries handling in `auth-pam.c`. Follow local conventions and helpers: `sshbuf`, `atomicio`, `fatal_f`/`fatal_fr`, `debug_f`, `sshlogdirect`, `set_log_handler(mm_log_handler, ...)`, `xcalloc`/`xrecallocarray`, and OpenSSH’s direct bounded control flow. I found no prior Fixer patch to replace; only the prompt/evidence bundle references this finding.

Avoid awkward control flow such as adding cleanup `goto`s around the monitor loop. Any future patch should preserve the existing bounded loop shape unless a reproduced busy-loop condition is found.

## Risks
Changing syslog open/close behavior could affect daemon logging semantics and the existing comment in `log_init()` about external libraries and syslog facility state.

Changing preauth monitor polling could break privilege-separation IPC or lose child log messages. The current evidence does not show a spin: it shows `poll()` sleep and normal disconnect/auth failure logging.

## Validation
Before reporting any patch as ready, try the workspace-root project entrypoint:

`./configure && make`

If that fails due to missing dependencies or generated files, report the exact command and failure, then run the narrowest reproducible compile such as rebuilding `monitor.o`, `monitor_wrap.o`, `log.o`, or `auth-pam.o` after `configure`.

For bounded independent reproduction before any source edit, run a local test `sshd`/`sshd-session` with PAM enabled if available, trigger a few invalid password attempts, and capture a short `strace -f` or `perf stat` around the preauth session. Only upgrade confidence to `reproduced` if that command actually shows a busy loop or excessive repeated `/dev/log` churn beyond normal auth failure logging.

## Patch Pass

Subject: diagnose sshd-session preauth poll sample

## Commit Message
No source change. The likely root cause is a profiler false positive: the sampled `sshd-session` was a preauth monitor process sleeping in `poll()`, then forwarding normal child authentication logs and cleaning up after a failed invalid-user connection.

The inspected OpenSSH code already uses the local monitor, logging, buffer, and IO helpers for this path: `monitor_read()`, `monitor_read_log()`, `mm_log_handler()`, `sshbuf`, `atomicio`, `sshlogdirect`, and `fatal_f`/`fatal_fr`. Changing this path without a reproduced spin or stronger trace would be speculative and not upstream-ready.

## Evidence Confidence
inferred

## Issue Connection
Fixer collected a 3-second profile and 5-second strace for `sshd-session: unknown [priv]`. The profile reported kernel time in `native_flush_tlb_one_user` and `__x64_sys_poll`, while `/proc` showed the process in `S (sleeping)` with `wchan` at `poll_schedule_timeout.constprop.0` and only 0.2% total CPU across three `sshd-session` processes.

The cautious code-level inference is that this was normal OpenSSH preauth monitor activity, not a demonstrated runaway loop. The strace shows the monitor reading a child log message, sending it to `/dev/log`, observing the child/log pipes close, reaping the auth child with status 255, logging PAM max-tries messages, and then unmapping libraries during cleanup. That maps directly to `monitor_read()`, `monitor_read_log()`, `mm_log_handler()`, and PAM max-tries handling.

I made no source change, following the saved plan at `plan-output.txt`. The expected effect is to avoid landing a speculative OpenSSH patch from indirect profiler evidence; an upstream report should instead ask for a longer trace or a local reproduction showing a tight monitor/log/syslog loop with sustained CPU.

## Git Add Paths
None

## Validation
Checked upstream/project guidance: only `README.md` matched the requested contribution/style doc search. It documents the normal Portable OpenSSH `./configure`, `make`, and `make tests` flow. No separate `CONTRIBUTING`, `HACKING`, `README-hacking`, `docs/`, or `dev-docs/` entry was present.

Inspected local helper conventions in the touched subsystem: OpenSSH uses `sshbuf` for monitor messages, `atomicio` for fd IO, `sshlogdirect`/`set_log_handler(mm_log_handler, ...)` for privsep logging, `fatal_f`/`fatal_fr` for fatal errors, and `xcalloc`/`xrecallocarray` for allocation. No generic replacement API was introduced.

Ran project-level entrypoint from the workspace root:
`./configure && make`
Result: failed immediately with `configure: error: ./configure.ac newer than configure, run autoreconf`.

Because the workspace has no generated `Makefile` or `config.h`, I ran the narrow focused fallback in a temporary copy to avoid generated-file churn:
`autoreconf && ./configure && make monitor.o monitor_wrap.o log.o auth-pam.o`
Result: succeeded. `configure` detected `PAM support: no` in this environment, so this was a compile check for the relevant monitor/log/PAM source files, not a runtime PAM reproduction.

Bounded independent reproduction attempt:
`./sshd-session -h`
Result: blocked because `./sshd-session` was not built in the workspace (`No such file or directory`). A realistic invalid-login runtime reproduction was also blocked by the failed root build entrypoint and the fallback configuration lacking PAM headers/support, so confidence remains `inferred`.

## Review Pass 1

RESULT: ok

No source changes are present, and `## Git Add Paths` correctly says `None`. The author kept confidence at `inferred`, did not invent a reproducer, and connected the profiler/strace evidence to the existing OpenSSH preauth monitor/logging path without overstating it as a confirmed bug.

Validation is acceptable for a no-patch diagnosis: `./configure && make` was attempted from the workspace root and failed with the exact generated-file blocker, then a focused compile was run in a temporary regenerated copy. The report also names the relevant local helpers and conventions (`sshbuf`, `atomicio`, `sshlogdirect`, `mm_log_handler`, `fatal_f`/`fatal_fr`) and explains why no upstreamable source patch should be landed from the current evidence.

## Plan Pass

## Problem
Fixer flagged `sshd-session: unknown [priv]` as a runaway/socket-churn process, but the evidence shows a sleeping preauth monitor in `poll()` with only 0.2% total CPU across three processes. The strace excerpt shows normal preauth failure teardown: child log messages forwarded to syslog, `wait4()` for the auth child, then PAM/library cleanup `munmap()` calls.

## Evidence Confidence
inferred

The bundle has profiler/strace excerpts, not an independent reproducer. The sampled stack is blocked in `poll_schedule_timeout`, and the syscall burst is short cleanup/logging activity. This is not strong enough for an upstream source patch claiming a confirmed OpenSSH bug.

## Proposed Subject
No source patch yet: diagnose likely false-positive `sshd-session` runaway report and require stronger evidence before changing OpenSSH monitor or logging behavior.

## Patch Plan
Do not edit files in this pass. A source patch would be speculative because the apparent hot path maps to existing intended code paths: `monitor_read()` polls the monitor/log fds, `monitor_read_log()` forwards child logs through `sshlogdirect()`, and `log.c` intentionally uses OpenSSH logging wrappers around syslog.

If stronger evidence is collected later, target the smallest relevant area: preauth monitor/log forwarding in `monitor.c`, `monitor_wrap.c`, `log.c`, and PAM max-tries handling in `auth-pam.c`. Follow local conventions and helpers: `sshbuf`, `atomicio`, `fatal_f`/`fatal_fr`, `debug_f`, `sshlogdirect`, `set_log_handler(mm_log_handler, ...)`, `xcalloc`/`xrecallocarray`, and OpenSSH’s direct bounded control flow. I found no prior Fixer patch to replace; only the prompt/evidence bundle references this finding.

Avoid awkward control flow such as adding cleanup `goto`s around the monitor loop. Any future patch should preserve the existing bounded loop shape unless a reproduced busy-loop condition is found.

## Risks
Changing syslog open/close behavior could affect daemon logging semantics and the existing comment in `log_init()` about external libraries and syslog facility state.

Changing preauth monitor polling could break privilege-separation IPC or lose child log messages. The current evidence does not show a spin: it shows `poll()` sleep and normal disconnect/auth failure logging.

## Validation
Before reporting any patch as ready, try the workspace-root project e

[truncated]

Issue page: /issues/019e20f0-8427-7c41-8b40-f8f9aaebb2ae. Issue JSON: /v1/issues/019e20f0-8427-7c41-8b40-f8f9aaebb2ae

sshd-session is stuck in a likely unclassified userspace loop: 100.00% of sampled CPU passed through netlink_create, with repeated thread backtraces show 1 thread(s) around 0x00007fac17a9a7d2 in ?? () from target:<path>.

## 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): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `openssh` 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. 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. 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.

Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `openssh` 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. 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 `openssh` 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): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, 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 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 `sshd-session: gis [priv]` with modest CPU attribution, but the captured process state is sleeping in `poll()`/`restart_syscall`, not spinning in an OpenSSH userspace loop. The only hot symbol is kernel `netlink_create`, and the mapped DSOs include `libnss_systemd`, `libsystemd`, and `pam_systemd`, which points more toward NSS/PAM/systemd interaction or profiler attribution noise than an identified OpenSSH bug.

## Evidence Confidence
inferred

## Proposed Subject
No source patch yet: diagnose inconclusive `sshd-session` profiler signal

## Patch Plan
Do not edit OpenSSH source in this pass. The available evidence is profiler/trace-only and does not identify a pull-request-ready OpenSSH code defect.

Relevant code inspected:
- `sshd-session.c`: PAM session setup happens before post-auth privsep; the `[priv]` process becomes the monitor.
- `monitor.c`: post-auth monitor waits in `monitor_read()` using `poll()` on monitor IPC/log fds.
- `monitor_wrap.c`: monitor IPC uses `atomicio()`, `sshbuf`, `fatal_f()`, `debug*_f()`, and `mm_reap()`.
- `auth-pam.c`: PAM auth/session handling can involve helper process/thread behavior and loaded PAM modules.
- `sshd.c`: systemd socket activation is listener-side, not the sampled `sshd-session` path.

Maintainer conventions/helpers found: use OpenSSH’s `atomicio()`, `sshbuf`, `xmalloc`/`xcalloc`, `fatal_f()`/`debug*_f()`, `ssh_signal()`, and existing monitor/PAM request helpers rather than raw ad hoc IPC/allocation/logging. No relevant `CONTRIBUTING`/`HACKING` docs were found; `README.md` documents the normal `./configure`, `make`, and `make tests` flow. No prior Fixer source patch or dirty workspace change was detected to improve or replace.

If stronger evidence is collected before editing, the patch target should be narrowly chosen from that evidence. Avoid awkward `goto` control flow; monitor/PAM code already uses small helper functions and bounded loops.

## Risks
A speculative source patch could mask the actual issue if the CPU sample comes from `pam_systemd`, `libnss_systemd`, kernel netlink behavior, or profiler misattribution. Changing monitor `poll()` handling without a demonstrated bad state risks altering sensitive privileged monitor shutdown semantics.

## Validation
Before any future source patch, try from workspace root:

`./configure && make`

If that fails due to missing dependencies or generated files, record the exact failure and then run the narrowest relevant compile, likely `make sshd-session` or `make monitor.o auth-pam.o`.

Bounded independent reproduction attempt before editing: build with symbols if possible, start a test `sshd` with `UsePAM yes`, establish one local session, then sample the resulting `sshd-session: <user> [priv]` with `strace -p <pid>` and `gdb -batch -p <pid> -ex bt` or an equivalent non-invasive `perf top/report` check. Do not claim `reproduced` unless this shows the same sleeping `poll()` plus repeated CPU-hot signal.

## Patch Pass

Subject: diagnose inconclusive sshd-session perf sample

## Commit Message
No source change was made. The collected signal does not identify an OpenSSH defect: the sampled privileged `sshd-session` process was sleeping in `poll()`, while the hot symbol was kernel `netlink_create` and the address space included `libnss_systemd`, `libsystemd`, and `pam_systemd`.

## Evidence Confidence
inferred

## Issue Connection
Fixer collected a perf/strace/proc sample for `sshd-session: gis [priv]`: 100% of sampled hot-path time was attributed to kernel `netlink_create`, strace saw only `restart_syscall(<... resuming interrupted poll ...>)`, `/proc` reported state `S (sleeping)`, and `wchan` was `poll_schedule_timeout.constprop.0`.

The likely root cause is not an OpenSSH userspace busy loop. In OpenSSH, the post-auth privileged session process is the monitor, and `monitor_read()` intentionally blocks in `poll()` waiting for monitor IPC or child log messages. The loaded `pam_systemd`/`libnss_systemd`/`libsystemd` mappings and kernel netlink attribution point more plausibly to PAM/NSS/systemd netlink activity or profiler attribution around session setup than to a concrete OpenSSH monitor bug.

I followed the saved plan and did not change course: because the evidence is profiler-only/indirect and no stronger local reproduction was available, I did not leave a source diff. The expected effect is that this proposal remains suitable as an upstream bug-report diagnosis instead of presenting a speculative patch as a confirmed OpenSSH fix.

Style/local helper scan: no `CONTRIBUTING`, `HACKING`, `README-hacking`, `docs/`, or `dev-docs/` files were present; `README.md` documents `./configure`, `make`, and `make tests`. Relevant OpenSSH conventions in this subsystem are `atomicio()`, `sshbuf`, `xmalloc`/`xcalloc`, `fatal_f()`/`debug*_f()`, `ssh_signal()`, and the existing monitor/PAM request helpers.

## Git Add Paths
None

## Validation
`./configure && make` from the workspace root failed before configuration:
`configure: error: ./configure.ac newer than configure, run autoreconf`

Focused compile fallback:
`make sshd-session` failed because configuration was not generated:
`includes.h:19:10: fatal error: config.h: No such file or directory`

Bounded independent reproduction attempt:
`pgrep -a sshd-session` reported `no live sshd-session process`, and `find /var/lib/fixer/investigations -maxdepth 1 -type d -name '*sshd-session*'` found no saved raw artifact directory to re-sample. I could not reproduce the collected CPU signal locally, so confidence remains `inferred`.

Final worktree check: `git status --short` showed no changes.

## Review Pass 1

RESULT: ok

No source changes are present in the workspace, and `patch-output.txt` correctly treats the profiler/strace evidence as indirect. It avoids a speculative OpenSSH patch, uses `inferred`, names the project-level validation failure and focused fallback, and explains the likely PAM/NSS/systemd or profiler-attribution angle without inventing a reproducer or confirmed upstream bug.

## Plan Pass

## Problem
Fixer observed `sshd-session: gis [priv]` with modest CPU attribution, but the captured process state is sleeping in `poll()`/`restart_syscall`, not spinning in an OpenSSH userspace loop. The only hot symbol is kernel `netlink_create`, and the mapped DSOs include `libnss_systemd`, `libsystemd`, and `pam_systemd`, which points more toward NSS/PAM/systemd interaction or profiler attribution noise than an identified OpenSSH bug.

## Evidence Confidence
inferred

## Proposed Subject
No source patch yet: diagnose inconclusive `sshd-session` profiler signal

## Patch Plan
Do not edit OpenSSH source in this pass. The available evidence is profiler/trace-only and does not identify a pull-request-ready OpenSSH code defect.

Relevant code inspected:
- `sshd-session.c`: PAM session setup happens before post-auth privsep; the `[priv]` process becomes the monitor.
- `monitor.c`: post-auth monitor waits in `monitor_read()` using `poll()` on monitor IPC/log fds.
- `monitor_wrap.c`: monitor IPC uses `atomicio()`, `sshbuf`, `fatal_f()`, `debug*_f()`, and `mm_reap()`.
- `auth-pam.c`: PAM auth/session handling can involve helper process/thread behavior and loaded PAM modules.
- `sshd.c`: systemd socket activation is listener-side, not the sampled `sshd-session` path.

Maintainer conventions/helpers found: use OpenSSH’s `atomicio()`, `sshbuf`, `xmalloc`/`xcalloc`, `fatal_f()`/`debug*_f()`, `ssh_signal()`, and existing monitor/PAM request helpers rather than raw ad hoc IPC/allocation/logging. No relevant `CONTRIBUTING`/`HACKING` docs were found; `README.md` documents the normal `./configure`, `make`, and `make tests` flow. No prior Fixer source patch or dirty workspace change was detected to improve or replace.

If stronger evidence is collected before editing, the patch target should be narrowly chosen from that evidence. Avoid awkward `goto` control flow; monitor/PAM code already uses small helper functions and bounded loops.

## Risks
A speculative source patch could mask the actual issue if the CPU sample comes from `pam_systemd`, `libnss_systemd`, kernel netlink behavior, or profiler misattribution. Changing monitor `poll()` handling without a demonstrated bad state risks altering sensitive privileged monitor shutdown semantics.

## Validation
Before any future source patch, try from workspace root:

`./configure && make`

If that fails due to mis

[truncated]

Issue page: /issues/019e2078-d1b9-7152-8626-a0548cba572a. Issue JSON: /v1/issues/019e2078-d1b9-7152-8626-a0548cba572a

sshd-session is stuck in a likely unclassified userspace loop: 27.47% of sampled CPU passed through inet6_dump_addr, with repeated thread backtraces show 1 thread(s) around 0x00007f3a8049a7d2 in ?? () from target:<path>.

## 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): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `openssh` 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. 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. 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.

Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `openssh` 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. 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 `openssh` 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): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, 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 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 an `sshd-session: gis [priv]` process in a suspected runaway-process investigation, but the captured state is not a clear OpenSSH userspace spin: the process state is sleeping, `wchan` is `poll_schedule_timeout`, strace only shows interrupted `poll`, and target CPU was reported as 0.1%. The hottest symbol, `inet6_dump_addr`, is in the kernel, not OpenSSH.

## Evidence Confidence
inferred

The evidence is profiler-only/indirect and unsymbolized for OpenSSH frames. It does not yet justify an upstream source patch.

## Proposed Subject
No source patch yet: diagnose `sshd-session` poll/profile signal before changing OpenSSH monitor/session code.

## Patch Plan
Do not edit files on this pass. First collect stronger evidence: a symbolized backtrace/perf sample for `sshd-session`, preferably with debug symbols, and confirm whether CPU is actually sustained above idle.

Relevant code inspected: `sshd-session.c`, `monitor.c`, `serverloop.c`, `atomicio.c`, `misc.c`, and OpenSSH compat polling code. The `[priv]` monitor path waits in `monitor_read()` on `poll()` over monitor/log fds; session/client loops use `ppoll()` with `ptimeout_*` helpers. Local conventions/helpers to preserve if a later patch is justified: `fatal_f`/`fatal_fr`, `debug_f`, `sshbuf`, `atomicio`, `monotime`, `ptimeout_*`, and `openbsd-compat` poll/ppoll portability.

Contribution/style docs checked: `README.md`, `README.privsep`, and `regress/README.regress`. No prior Fixer patch was found; only Debian quilt patches are applied. If later evidence identifies a real monitor/log-drain issue, use bounded straight-line control flow and avoid adding awkward `goto`.

## Risks
A source patch from the current evidence would likely be speculative and not pull-request-ready. Changing monitor polling could regress authentication/session teardown, log forwarding, or privsep behavior without addressing the observed kernel-profile signal.

## Validation
For any later source patch, first try the project-level entrypoint from the workspace root: `./configure && make`. If that fails due to missing dependencies or generated files, record the exact command and failure reason, then run the narrowest relevant build target such as `make sshd-session`.

For a cheap independent reproduction attempt, run a bounded privsep/session smoke test after building, e.g. `make tests LTESTS=connect-privsep`, and separately sample the spawned `sshd-session` with a short `timeout`-bounded `strace`/`perf` check. Do not claim `reproduced` unless that command actually shows sustained CPU or a repeatable loop.

## Patch Pass

Subject: no patch: diagnose sshd-session poll sample

## Commit Message
No source change is proposed. The collected evidence points at an `sshd-session` privileged monitor process sleeping in `poll(2)`, not at a reproducible OpenSSH userspace loop. A source patch would be speculative without a symbolized hot frame or repeatable runtime signal.

## Evidence Confidence
inferred

## Issue Connection
The likely root cause of the collected signal is a profiler classification mismatch: perf named `inet6_dump_addr` in the kernel as the hottest sampled symbol, while `/proc` showed the target `sshd-session: gis [priv]` process in `S (sleeping)` state, `wchan` showed `poll_schedule_timeout`, and strace captured only `restart_syscall(<... resuming interrupted poll ...>)`.

The cautious code-level inference is that the privileged monitor, which is the root-owned OpenSSH process that services privilege-separated child requests, was blocked in its normal `monitor_read()` poll loop over monitor and log file descriptors. I inspected `monitor.c`, `serverloop.c`, `sshd-session.c`, `atomicio.c`, `misc.c`, and `openbsd-compat` polling support. The relevant local conventions are `fatal_f`/`fatal_fr`, `debug_f`, `sshbuf`, `atomicio`, `monotime`, `ptimeout_*`, and `openbsd-compat` poll/ppoll wrappers. I also checked `README.md`, `README.privsep`, and `regress/README.regress`.

I followed the saved plan and made no source change because the evidence is indirect and does not connect to a safe upstream fix. The expected effect of leaving no diff is to avoid landing an unreviewable mitigation for what currently looks like a sleeping poll wait or kernel-side profiling artifact rather than a demonstrated OpenSSH bug.

## Git Add Paths
None

## Validation
`./configure && make` failed from the workspace root with: `configure: error: ./configure.ac newer than configure, run autoreconf`.

Focused compile fallback `make sshd-session` also failed because the workspace was not configured: `includes.h:19:10: fatal error: config.h: No such file or directory`.

Bounded independent reproduction was attempted but could not reproduce the signal locally: `pgrep -a sshd-session` found no live target process, and the raw investigation directory named in `evidence.json` was not present in this workspace (`missing`). Confidence remains `inferred`.

## Review Pass 1

RESULT: ok

The pass is acceptable as a no-patch diagnosis. The workspace has no source diff, which is appropriate for `inferred` evidence: the bundle is profiler/strace/proc-state evidence only, with the sampled process sleeping in `poll` and no independently reproduced OpenSSH userspace loop.

The author response includes the required sections, uses a valid `## Evidence Confidence` value, does not claim reproduction, and reports the project-level validation attempt with the exact blocker: `./configure && make` failed because `configure.ac` is newer than `configure`. It also reports a focused fallback compile failure and a bounded reproduction attempt that found no live `sshd-session` target and no raw investigation directory.

The maintainer-facing explanation is cautious enough for the evidence level and names the relevant OpenSSH helper/convention scan (`fatal_f`, `sshbuf`, `atomicio`, `ptimeout_*`, `openbsd-compat` poll/ppoll).

## Plan Pass

## Problem
Fixer observed an `sshd-session: gis [priv]` process in a suspected runaway-process investigation, but the captured state is not a clear OpenSSH userspace spin: the process state is sleeping, `wchan` is `poll_schedule_timeout`, strace only shows interrupted `poll`, and target CPU was reported as 0.1%. The hottest symbol, `inet6_dump_addr`, is in the kernel, not OpenSSH.

## Evidence Confidence
inferred

The evidence is profiler-only/indirect and unsymbolized for OpenSSH frames. It does not yet justify an upstream source patch.

## Proposed Subject
No source patch yet: diagnose `sshd-session` poll/profile signal before changing OpenSSH monitor/session code.

## Patch Plan
Do not edit files on this pass. First collect stronger evidence: a symbolized backtrace/perf sample for `sshd-session`, preferably with debug symbols, and confirm whether CPU is actually sustained above idle.

Relevant code inspected: `sshd-session.c`, `monitor.c`, `serverloop.c`, `atomicio.c`, `misc.c`, and OpenSSH compat polling code. The `[priv]` monitor path waits in `monitor_read()` on `poll()` over monitor/log fds; session/client loops use `ppoll()` with `ptimeout_*` helpers. Local conventions/helpers to preserve if a later patch is justified: `fatal_f`/`fatal_fr`, `debug_f`, `sshbuf`, `atomicio`, `monotime`, `ptimeout_*`, and `openbsd-compat` poll/ppoll portability.

Contribution/style docs checked: `README.md`, `README.privsep`, and `regress/README.regress`. No prior Fixer patch was found; only Debian quilt patches are applied. If later evidence identifies a real monitor/log-drain issue, use bounded straight-line control flow and avoid adding awkward `goto`.

## Risks
A source patch from the current evidence would likely be speculative and not pull-request-ready. Changing monitor polling could regress authentication/session teardown, log forwarding, or privsep behavior without addressing the observed kernel-profile signal.

## Validation
For any later source patch, first try the project-level entrypoint from the workspace root: `./configure && make`. If that fails due to missing dependencies or generated files, record the exact command and failure reason, then run the narrowest relevant build target such as `make sshd-session`.

For a cheap independent reproduction attempt, run a bounded privsep/session smoke test after building, e.g. `make tests LTESTS=conne

[truncated]

Issue page: /issues/019e1f24-cad9-7d93-ae4a-ff6d3191382b. Issue JSON: /v1/issues/019e1f24-cad9-7d93-ae4a-ff6d3191382b

python3.13 is stuck in a likely busy poll loop: 50.00% of sampled CPU passed through fdget, with repeated thread backtraces show 1 thread(s) around 0x00007f1c6e7efe92 in pthread_attr_destroy () from target:<path>.

## 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): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `python3.13` 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. 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. 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.

A previous Fixer patch attempt already exists for this issue. It was generated by Fixer `0.148.0`. Review that patch before changing code, improve it instead of starting blind, and clean up anything awkward or underexplained. In particular, remove avoidable `goto`, tighten the explanation of what the patch is doing, and make the resulting diff feel ready for upstream git review.
- Prior patch: `./prior-best.patch`
- Prior published session: `./prior-best-session.md`

Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `python3.13` 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. 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 (local metadata check)

Local metadata consistency check

## Refinement Pass 1

You are refining a fixer patch after an explicit code review.

Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Read the latest author response at `./patch-output.txt`. Read the review report at `./review-1-output.txt`. This is refinement round 1. The original pre-edit snapshot is available at `./source` if you need to compare the current patch against it. Re-read the planning pass at `./plan-output.txt` before editing. The workspace currently changes these repo-relative paths: Lib/__pycache__/__future__.cpython-313.pyc, Lib/__pycache__/_collections_abc.cpython-313.pyc, Lib/__pycache__/_colorize.cpython-313.pyc, Lib/__pycache__/_compat_pickle.cpython-313.pyc, Lib/__pycache__/_compression.cpython-313.pyc, Lib/__pycache__/_opcode_metadata.cpython-313.pyc, Lib/__pycache__/_sitebuiltins.cpython-313.pyc, Lib/__pycache__/_weakrefset.cpython-313.pyc, Lib/__pycache__/abc.cpython-313.pyc, Lib/__pycache__/argparse.cpython-313.pyc, Lib/__pycache__/ast.cpython-313.pyc, Lib/__pycache__/bz2.cpython-313.pyc, Lib/__pycache__/codecs.cpython-313.pyc, Lib/__pycache__/contextlib.cpython-313.pyc, Lib/__pycache__/contextvars.cpython-313.pyc, Lib/__pycache__/copy.cpython-313.pyc, Lib/__pycache__/copyreg.cpython-313.pyc, Lib/__pycache__/datetime.cpython-313.pyc, Lib/__pycache__/dis.cpython-313.pyc, Lib/__pycache__/enum.cpython-313.pyc, Lib/__pycache__/fnmatch.cpython-313.pyc, Lib/__pycache__/functools.cpython-313.pyc, Lib/__pycache__/genericpath.cpython-313.pyc, Lib/__pycache__/gettext.cpython-313.pyc, Lib/__pycache__/glob.cpython-313.pyc, Lib/__pycache__/heapq.cpython-313.pyc, Lib/__pycache__/inspect.cpython-313.pyc, Lib/__pycache__/io.cpython-313.pyc, Lib/__pycache__/keyword.cpython-313.pyc, Lib/__pycache__/linecache.cpython-313.pyc, Lib/__pycache__/locale.cpython-313.pyc, Lib/__pycache__/lzma.cpython-313.pyc, Lib/__pycache__/numbers.cpython-313.pyc, Lib/__pycache__/opcode.cpython-313.pyc, Lib/__pycache__/operator.cpython-313.pyc, Lib/__pycache__/os.cpython-313.pyc, Lib/__pycache__/posixpath.cpython-313.pyc, Lib/__pycache__/reprlib.cpython-313.pyc, Lib/__pycache__/selectors.cpython-313.pyc, Lib/__pycache__/shutil.cpython-313.pyc, Lib/__pycache__/signal.cpython-313.pyc, Lib/__pycache__/site.cpython-313.pyc, Lib/__pycache__/socket.cpython-313.pyc, Lib/__pycache__/ssl.cpython-313.pyc, Lib/__pycache__/stat.cpython-313.pyc, Lib/__pycache__/string.cpython-313.pyc, Lib/__pycache__/struct.cpython-313.pyc, Lib/__pycache__/subprocess.cpython-313.pyc, Lib/__pycache__/textwrap.cpython-313.pyc, Lib/__pycache__/threading.cpython-313.pyc, Lib/__pycache__/token.cpython-313.pyc, Lib/__pycache__/tokenize.cpython-313.pyc, Lib/__pycache__/traceback.cpython-313.pyc, Lib/__pycache__/types.cpython-313.pyc, Lib/__pycache__/typing.cpython-313.pyc, Lib/__pycache__/warnings.cpython-313.pyc, Lib/__pycache__/weakref.cpython-313.pyc, Lib/asyncio/__pycache__/__init__.cpython-313.pyc, Lib/asyncio/__pycache__/base_events.cpython-313.pyc, Lib/asyncio/__pycache__/base_futures.cpython-313.pyc, Lib/asyncio/__pycache__/base_subprocess.cpython-313.pyc, Lib/asyncio/__pycache__/base_tasks.cpython-313.pyc, Lib/asyncio/__pycache__/constants.cpython-313.pyc, Lib/asyncio/__pycache__/coroutines.cpython-313.pyc, Lib/asyncio/__pycache__/events.cpython-313.pyc, Lib/asyncio/__pycache__/exceptions.cpython-313.pyc, Lib/asyncio/__pycache__/format_helpers.cpython-313.pyc, Lib/asyncio/__pycache__/futures.cpython-313.pyc, Lib/asyncio/__pycache__/locks.cpython-313.pyc, Lib/asyncio/__pycache__/log.cpython-313.pyc, Lib/asyncio/__pycache__/mixins.cpython-313.pyc, Lib/asyncio/__pycache__/protocols.cpython-313.pyc, Lib/asyncio/__pycache__/queues.cpython-313.pyc, Lib/asyncio/__pycache__/runners.cpython-313.pyc, Lib/asyncio/__pycache__/selector_events.cpython-313.pyc, Lib/asyncio/__pycache__/sslproto.cpython-313.pyc, Lib/asyncio/__pycache__/staggered.cpython-313.pyc, Lib/asyncio/__pycache__/streams.cpython-313.pyc, Lib/asyncio/__pycache__/subprocess.cpython-313.pyc, Lib/asyncio/__pycache__/taskgroups.cpython-313.pyc, Lib/asyncio/__pycache__/tasks.cpython-313.pyc, Lib/asyncio/__pycache__/threads.cpython-313.pyc, Lib/asyncio/__pycache__/timeouts.cpython-313.pyc, Lib/asyncio/__pycache__/transports.cpython-313.pyc, Lib/asyncio/__pycache__/trsock.cpython-313.pyc, Lib/asyncio/__pycache__/unix_events.cpython-313.pyc, Lib/collections/__pycache__/__init__.cpython-313.pyc, Lib/concurrent/__pycache__/__init__.cpython-313.pyc, Lib/concurrent/futures/__pycache__/__init__.cpython-313.pyc, Lib/concurrent/futures/__pycache__/_base.cpython-313.pyc, Lib/encodings/__pycache__/__init__.cpython-313.pyc, Lib/encodings/__pycache__/aliases.cpython-313.pyc, Lib/encodings/__pycache__/ascii.cpython-313.pyc, Lib/encodings/__pycache__/utf_8.cpython-313.pyc, Lib/importlib/__pycache__/__init__.cpython-313.pyc, Lib/importlib/__pycache__/_abc.cpython-313.pyc, Lib/logging/__pycache__/__init__.cpython-313.pyc, Lib/pathlib/__pycache__/__init__.cpython-313.pyc, Lib/pathlib/__pycache__/_abc.cpython-313.pyc, Lib/pathlib/__pycache__/_local.cpython-313.pyc, Lib/re/__pycache__/__init__.cpython-313.pyc, Lib/re/__pycache__/_casefix.cpython-313.pyc, Lib/re/__pycache__/_compiler.cpython-313.pyc, Lib/re/__pycache__/_constants.cpython-313.pyc, Lib/re/__pycache__/_parser.cpython-313.pyc, Lib/sysconfig/__pycache__/__init__.cpython-313.pyc, Lib/sysconfig/__pycache__/__main__.cpython-313.pyc, Lib/xml/__pycache__/__init__.cpython-313.pyc, Lib/xml/etree/__pycache__/ElementPath.cpython-313.pyc, Lib/xml/etree/__pycache__/__init__.cpython-313.pyc, Lib/zoneinfo/__pycache__/__init__.cpython-313.pyc, Lib/zoneinfo/__pycache__/_common.cpython-313.pyc, Lib/zoneinfo/__pycache__/_tzpath.cpython-3

[truncated 28147 bytes]

## Plan Pass

## Problem
Fixer observed high CPU attribution for `/usr/bin/python3 /usr/bin/supervisord -n -c /etc/supervisor/supervisord.conf`, but the evidence shows `supervisord` sleeping in `poll_schedule_timeout` and repeating `wait4(..., WNOHANG) = ECHILD` followed by `poll(..., 1000) = 0`. That points first at the application event loop, not a proven CPython runtime defect.

## Evidence Confidence
inferred

## Proposed Subject
No CPython source patch for application-level poll evidence

## Patch Plan
Do not edit CPython in this pass. Replace the prior Fixer patch as unsuitable: it adds generated `Makefile.pre` content while the collected evidence does not justify a source change.

If stronger evidence is collected before editing, start from the `supervisord` entrypoint: live Python stack, fd 4 target, and whether the one-second poll/wait cycle is abnormal for that supervisor config. The raw investigation artifact directory referenced by `evidence.json` is unavailable here, so the embedded excerpts are the current evidence limit.

If later evidence proves CPython involvement, inspect `Modules/selectmodule.c`, `Modules/posixmodule.c`, `Lib/selectors.py`, and `Lib/subprocess.py`. Local conventions found: `_PyDeadline` for timeout recomputation, `Py_BEGIN_ALLOW_THREADS` around blocking syscalls, `PyErr_CheckSignals()` on EINTR paths, and `_waitpid_lock` in subprocess polling. Avoid awkward control flow such as new avoidable `goto`; use bounded branches matching nearby style.

Docs checked: `README.rst` points to the CPython Developer Guide and documents `./configure`, `make`, `make test`; `debian/README.source` notes quilt packaging. No relevant top-level `CONTRIBUTING` or `HACKING` file was found.

## Risks
A CPython patch from this evidence would be speculative and could regress normal `select.poll`, `selectors`, subprocess wait handling, signal handling, or service-manager polling. A one-second timeout may be intended `supervisord` behavior.

## Validation
Before any future source-patch report, try `./configure && make` from the workspace root. If that fails due to dependencies or generated files, record the exact command and failure, then run the narrowest relevant checks such as `./python -m test test_select test_posix test_subprocess`.

For bounded independent reproduction, attempt `strace -f -e poll,wait4 /usr/bin/supervisord -n -c /etc/supervisor/supervisord.conf` only if that binary and config exist. Here they do not, so a local reproduced claim is blocked.

## Patch Pass

Subject: No CPython patch for application-level poll evidence

## Commit Message
No source files were changed. The collected signal points at a Python-hosted `supervisord` event loop, not a demonstrated CPython runtime defect, so an upstream CPython patch would be speculative.

## Evidence Confidence
inferred

## Issue Connection
The likely root cause from the collected perf, `strace`, and `/proc` evidence is an application-level polling loop. Fixer observed `/usr/bin/python3 /usr/bin/supervisord -n -c /etc/supervisor/supervisord.conf`; the trace repeats `wait4(-1, ..., WNOHANG) = ECHILD` followed by `poll(..., 1000) = 0`, and `/proc` shows the process sleeping in `poll_schedule_timeout`.

That pattern is consistent with `supervisord` waking once per second to check for child processes and fd readiness, not with a tight CPython `poll()` or `wait4()` runtime loop. I followed the saved plan and did not make a source change. The prior Fixer patch should be replaced because it adds generated `Makefile.pre` output without a justified CPython source fix.

Local conventions checked: `Modules/selectmodule.c` uses `_PyDeadline`, `Py_BEGIN_ALLOW_THREADS`, and `PyErr_CheckSignals()` around `poll()`; `Modules/posixmodule.c` follows the same thread-release and EINTR/signal-check pattern around `wait4()`; `Lib/selectors.py` and `Lib/subprocess.py` preserve their existing timeout and `_waitpid_lock` behavior. No relevant local helper was missing. The expected effect is no CPython behavior change and no speculative regression in `select`, `selectors`, subprocess waiting, or signal handling.

## Git Add Paths
None

## Validation
Read `./plan-output.txt` and followed it.

Reviewed contribution/style docs: `README.rst` points to the CPython Developer Guide and documents `./configure`, `make`, `make test`; `debian/README.source` notes Debian quilt packaging. No top-level `CONTRIBUTING`, `HACKING`, or `README-hacking` file was found.

Ran `./configure && make` from the workspace root. It completed with exit code 0. The build reported optional `_dbm`, `_gdbm`, and `_tkinter` missing, and `_ssl` was built but removed because it failed to import with `undefined symbol: TLSv1_method`.

Independent reproduction was blocked: `/usr/bin/supervisord` is not executable/present, `/etc/supervisor/supervisord.conf` is not readable/present, and the raw investigation artifact directory referenced by `evidence.json` is unavailable. Confidence therefore remains `inferred`.

## Review Pass 1 (local metadata check)

RESULT: fix-needed

## Findings
1. Patch metadata drift: the workspace currently changes `Lib/__pycache__/__future__.cpython-313.pyc`, `Lib/__pycache__/_collections_abc.cpython-313.pyc`, `Lib/__pycache__/_colorize.cpython-313.pyc`, `Lib/__pycache__/_compat_pickle.cpython-313.pyc`, `Lib/__pycache__/_compression.cpython-313.pyc`, `Lib/__pycache__/_opcode_metadata.cpython-313.pyc`, `Lib/__pycache__/_sitebuiltins.cpython-313.pyc`, `Lib/__pycache__/_weakrefset.cpython-313.pyc`, `Lib/__pycache__/abc.cpython-313.pyc`, `Lib/__pycache__/argparse.cpython-313.pyc`, `Lib/__pycache__/ast.cpython-313.pyc`, `Lib/__pycache__/bz2.cpython-313.pyc`, `Lib/__pycache__/codecs.cpython-313.pyc`, `Lib/__pycache__/contextlib.cpython-313.pyc`, `Lib/__pycache__/contextvars.cpython-313.pyc`, `Lib/__pycache__/copy.cpython-313.pyc`, `Lib/__pycache__/copyreg.cpython-313.pyc`, `Lib/__pycache__/datetime.cpython-313.pyc`, `Lib/__pycache__/dis.cpython-313.pyc`, `Lib/__pycache__/enum.cpython-313.pyc`, `Lib/__pycache__/fnmatch.cpython-313.pyc`, 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Update `## Git Add Paths` to match the real shipped file set exactly, and make sure `## Issue Connection` explains every functional file that remains in the patch.
2. Missing from `## Git Add Paths`: `Lib/__pycache__/__future__.cpython-313.pyc`, `Lib/__pycache__/_collections_abc.cpython-313.pyc`, `Lib/__pycache__/_colorize.cpython-313.pyc`, `Lib/__pycache__/_compat_pickle.cpython-313.pyc`, `Lib/__pycache__/_compression.cpython-313.pyc`, `Lib/__pycache__/_opcode_metadata.cpython-313.pyc`, `Lib/__pycache__/_sitebuiltins.cpython-313.pyc`, `Lib/__pycache__/_weakrefset.cpython-313.pyc`, `Lib/__pycache__/abc.cpython-313.pyc`, `Lib/__pycache__/argparse.cpython-313.pyc`, `Lib/__pycache__/ast.cpython-313.pyc`, `Lib/__pycache__/bz2.cpython-313.pyc`, `Lib/__pycache__/codecs.cpython-313.pyc`, `Lib/__pycache__/contextlib.cpython-313.pyc`, `Lib/__pycache__/contextvars.cpython-313.pyc`, `Lib/__pycache__/copy.cpython-313.pyc`, `Lib/__pycache__/copyreg.cpython-313.pyc`, `Lib/__pycache__/datetime.cpython-313.pyc`, `Lib/__pycache__/dis.cpython-313.pyc`, `Lib/__pycache__/enum.cpython-313.pyc`, `Lib/__pycache__/fnmatch.cpython-313.pyc`, 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2. Listed in `## Git Add Paths` but not actually changed: `None`.

## Refinement Pass 1

Subject: No CPython patch for application-level poll evidence

## Commit Message
No source files were changed. The collected signal still points at a Python-hosted `supervisord` event loop, not a demonstrated CPython runtime defect. This refinement removes validation-generated build artifacts so the no-patch diagnosis is consistent with the clean workspace.

## Evidence Confidence
inferred

## Issue Connection
Fixer observed `/usr/bin/python3 /usr/bin/supervisord -n -c /etc/supervisor/supervisord.conf` with a sampled `poll,wait4,poll` sequence. The process was sleeping in `poll_schedule_timeout`; `strace` shows `wait4(-1, ..., WNOHANG) = ECHILD` followed by `poll(..., 1000) = 0`.

The cautious inference is unchanged: this looks like `supervisord` waking once per second to check child state and fd readiness, not a proven CPython runtime bug. I made no source change. The only refinement was addressing the review finding by removing generated build products left by validation.

Local conventions checked remain relevant: `Modules/selectmodule.c` uses `_PyDeadline`, `Py_BEGIN_ALLOW_THREADS`, and `PyErr_CheckSignals()` around `poll()`; `Modules/posixmodule.c` follows the same syscall pattern around `wait4()`; `Lib/selectors.py` and `Lib/subprocess.py` preserve timeout and `_waitpid_lock` behavior. The expected effect is no CPython behavior change and no speculative regression.

## Git Add Paths
None

## Validation
Read `patch-output.txt`, `review-1-output.txt`, and `plan-output.txt`. The review finding was metadata drift from generated build artifacts.

Ran `make distclean` from the workspace root to remove generated artifacts. Verified `git status --short` is clean.

Rechecked the evidence summary: command line, sleeping state, `poll_schedule_timeout`, and the repeated `wait4(... WNOHANG) = ECHILD` plus `poll(..., 1000)` signal.

The project-level entrypoint was already run in this workspace before review: `./configure && make` completed with exit code 0, while reporting optional `_dbm`, `_gdbm`, `_tkinter` missing and `_ssl` removed after import failure due to `undefined symbol: TLSv1_method`. I did not rerun it after cleanup because there are no source changes and rerunning would recreate the reviewed generated artifacts.

Independent reproduction remains blocked: `/usr/bin/supervisord`, `/etc/supervisor/supervisord.conf`, and the raw investigation artifact directory are unavailable.

## Review Pass 2

RESULT: ok

No source patch is present and the workspace is clean. The refined response correctly keeps `## Evidence Confidence` as `inferred`, avoids claiming a reproduced CPython bug, and explains that the available perf/strace evidence points to a `supervisord` polling loop rather than a demonstrated runtime defect.

The previous metadata drift was addressed: generated build artifacts were removed with `make distclean`, and `git status --short` is clean. Validation and reproduction limitations are stated clearly.

## Plan Pass

## Problem
Fixer observed high CPU attribution for `/usr/bin/python3 /usr/bin/supervisord -n -c /etc/supervisor/supervisord.conf`, but the evidence shows `supervisord` sleeping in `poll_schedule_timeout` and repeating `wait4(..., WNOHANG) = ECHILD` followed by `poll(..., 1000) = 0`. That points first at the application event loop, not a proven CPython runtime defect.

## Evidence Confidence
inferred

## Proposed Subject
No CPython source patch for application-level poll evidence

## Patch Plan
Do not edit CPython in this pass. Replace the prior Fixer patch as unsuitable: it adds generated `Makefile.pre` content while the collected evidence does not justify a source change.

If stronger evidence is collected before editing, start from the `supervisord` entrypoint: live Python stack, fd 4 target, and whether the one-second poll/wait cycle is abnormal for that supervisor config. The raw investigation artifact directory referenced by `evidence.json` is unavailable here, so the embedded excerpts are the current evidence limit.

If later evidence proves CPython involvement, inspect `Modules/selectmodule.c`, `Modules/posixmodule.c`, `Lib/selectors.py`, and `Lib/subprocess.py`. Local conventions found: `_PyDeadline` for timeout recomputation, `Py_BEGIN_ALLOW_THREADS` around blocking syscalls, `PyErr_CheckSignals()` on EINTR paths, and `_waitpid_lock` in subprocess polling. Avoid awkward control flow such as new avoidable `goto`; use bounded branches matching nearby style.

Docs checked: `README.rst` points to the CPython Developer Guide and documents `./configure`, `make`, `make test`; `debian/README.source` notes quilt packaging. No relevant top-level `CONTRIBUTING` or `HACKING` file was found.

## Risks
A CPython patch from this evidence would be speculative and could regress normal `select.poll`, `selectors`, subprocess wait handling, signal handling, or service-manager polling. A one-second timeout may be intended `supervisord` behavior.

## Validation
Before any future source-patch report, try `./configure && make` from the workspace root. If that fails due to dependencies or generated files, record the exact command and failure, then run the narrowest relevant checks such as `./python -m test test_select test_posix test_subprocess`.

For bounded independent reproduction, attempt `strace -f -e poll,wait4 /usr/bin/supervisord -n -c /etc/supervisor/

[truncated]

Issue page: /issues/019dcbfa-dec1-70e2-b6f2-bdadef4c4fd8. Issue JSON: /v1/issues/019dcbfa-dec1-70e2-b6f2-bdadef4c4fd8

python3.13 is stuck in a likely busy poll loop: 50.00% of sampled CPU passed through _raw_spin_lock_irqsave, with repeated thread backtraces show 1 thread(s) around 0x00007f1c6e7efe92 in pthread_attr_destroy () from target:<path>.

## 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): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `python3.13` 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. 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. 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.

Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `python3.13` 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. 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 `python3.13` 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): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, 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 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 high aggregate CPU attributed to `python3.13` while running `/usr/bin/python3 /usr/bin/supervisord -n -c /etc/supervisor/supervisord.conf`, but the collected syscall evidence shows a one-second cadence: `wait4(..., WNOHANG) = -1 ECHILD` followed by `poll(..., 1000) = 0 <~1.001s>`. That looks like an application-level supervisord event loop, not a tight CPython runtime poll loop.

## Evidence Confidence
inferred

## Proposed Subject
No CPython source patch yet: diagnose and close/redirect unless an independent reproduction ties the CPU to a CPython bug. A maintainer-facing subject would be: `No CPython change: supervisord evidence shows timed polling, not runtime busy-poll`.

## Patch Plan
Do not edit CPython in this pass. The evidence does not identify a CPython defect: the backtrace is mostly unsymbolized, the process is `S (sleeping)`, `wchan` is `poll_schedule_timeout`, and strace shows blocking `poll(1000)` calls rather than immediate wakeups.

If new evidence later proves a CPython issue, inspect the relevant CPython subsystem before patching and follow existing helpers/conventions found here: `select.poll()` uses `_PyTime_FromMillisecondsObject`, `_PyDeadline_Init/_PyDeadline_Get`, `_PyTime_AsMilliseconds`, `Py_BEGIN_ALLOW_THREADS`, and EINTR retry handling with `PyErr_CheckSignals`; `os.wait4()`/`waitpid()` wrappers use the same thread-release and EINTR pattern. No relevant local helper is missing from the currently implicated path.

No prior Fixer patch was found in this workspace; Debian has quilt patches, but none appear to target this finding. Avoid any awkward control-flow patch such as adding `goto`-based throttling to CPython’s poll/wait wrappers, because the observed loop already blocks for about one second and should not be changed without a reproducer.

## Risks
Changing CPython’s `poll`, `selectors`, `wait4`, or subprocess wait behavior from this evidence would risk altering documented blocking semantics and signal/EINTR behavior for all Python users while only addressing a likely supervisord policy loop.

The raw investigation artifact directory and `supervisord` executable/config are not present in this workspace, so the collected evidence cannot currently be independently replayed here.

## Validation
Before reporting any source patch, try the project build entrypoint from the workspace root: `./configure && make`. If it fails due to missing build dependencies or generated files, record the exact failure and then run the narrowest relevant compile/check.

For the independent failure-signal check, when `supervisord` is available, run a bounded replay such as `timeout 8s strace -f -e poll,wait4 -tt -T /usr/bin/python3 /usr/bin/supervisord -n -c /etc/supervisor/supervisord.conf` and verify whether `poll(..., 1000)` blocks for about one second or returns immediately. Without that reproduction showing immediate wakeups or a CPython frame responsible for CPU burn, do not claim `reproduced` or submit a CPython patch.

## Patch Pass

Subject: No patch: diagnose supervisord timed polling

## Commit Message
No source change is proposed. The collected evidence does not show a CPython runtime busy loop: it shows `supervisord` running under Python, sleeping in `poll(2)` with a one-second timeout and periodically calling `wait4(..., WNOHANG)`.

## Evidence Confidence
inferred

## Issue Connection
Fixer collected a perf/profile signal for `/usr/bin/python3.13` with high aggregate CPU, but the `/proc` and strace details point away from a tight interpreter loop. The process state was `S (sleeping)`, `wchan` was `poll_schedule_timeout`, and strace showed repeated `poll(..., 1000)` calls returning after about `1.001s`, with `wait4(-1, ..., WNOHANG)` returning `ECHILD`.

The cautious inference is that this is an application-level `supervisord` polling loop, not a CPython `select.poll()` or `os.wait4()` bug. I followed the saved plan and did not change course: no source diff was left because the evidence remains indirect and does not identify a safe upstream CPython fix.

I inspected the relevant CPython helpers and conventions. `Modules/selectmodule.c` already uses `_PyTime_FromMillisecondsObject`, `_PyDeadline_Init/_PyDeadline_Get`, `_PyTime_AsMilliseconds`, `Py_BEGIN_ALLOW_THREADS`, and EINTR retry via `PyErr_CheckSignals`; `Modules/posixmodule.c` uses the matching GIL-release and EINTR pattern for `wait4()`/`waitpid()`. No missing local helper or clearer bounded control-flow change was found.

The expected effect of this proposal is to avoid an unjustified CPython behavior change and preserve the current documented poll/wait semantics until stronger evidence ties the reported CPU use to CPython itself.

## Git Add Paths
None

## Validation
Ran `./configure && make` from the workspace root. It completed with exit code 0. During the build, CPython reported `_ssl` failed to import due to `undefined symbol: TLSv1_method`, and listed `_dbm`, `_gdbm`, and `_tkinter` as missing optional modules.

Ran `make distclean` afterward to remove generated build products; `git status --short` is clean.

Independent reproduction was attempted but blocked: `command -v supervisord` returned no path, `/etc/supervisor/supervisord.conf` was absent (`test -e ...` returned `1`), and the raw investigation directory from `evidence.json` was not present. Therefore I did not reproduce the failure locally.

## Review Pass 1

RESULT: ok

No source diff is present and `git status --short` is clean, so there are no code-level regressions to review.

The no-patch diagnosis is consistent with the evidence: strace shows timed `poll(..., 1000)` sleeps rather than a tight CPython loop, and the response correctly uses `inferred` confidence, avoids inventing a reproducer, names the relevant CPython helper conventions, and reports the project-level `./configure && make` validation plus the blocked independent reproduction attempt.

## Plan Pass

## Problem
Fixer observed high aggregate CPU attributed to `python3.13` while running `/usr/bin/python3 /usr/bin/supervisord -n -c /etc/supervisor/supervisord.conf`, but the collected syscall evidence shows a one-second cadence: `wait4(..., WNOHANG) = -1 ECHILD` followed by `poll(..., 1000) = 0 <~1.001s>`. That looks like an application-level supervisord event loop, not a tight CPython runtime poll loop.

## Evidence Confidence
inferred

## Proposed Subject
No CPython source patch yet: diagnose and close/redirect unless an independent reproduction ties the CPU to a CPython bug. A maintainer-facing subject would be: `No CPython change: supervisord evidence shows timed polling, not runtime busy-poll`.

## Patch Plan
Do not edit CPython in this pass. The evidence does not identify a CPython defect: the backtrace is mostly unsymbolized, the process is `S (sleeping)`, `wchan` is `poll_schedule_timeout`, and strace shows blocking `poll(1000)` calls rather than immediate wakeups.

If new evidence later proves a CPython issue, inspect the relevant CPython subsystem before patching and follow existing helpers/conventions found here: `select.poll()` uses `_PyTime_FromMillisecondsObject`, `_PyDeadline_Init/_PyDeadline_Get`, `_PyTime_AsMilliseconds`, `Py_BEGIN_ALLOW_THREADS`, and EINTR retry handling with `PyErr_CheckSignals`; `os.wait4()`/`waitpid()` wrappers use the same thread-release and EINTR pattern. No relevant local helper is missing from the currently implicated path.

No prior Fixer patch was found in this workspace; Debian has quilt patches, but none appear to target this finding. Avoid any awkward control-flow patch such as adding `goto`-based throttling to CPython’s poll/wait wrappers, because the observed loop already blocks for about one second and should not be changed without a reproducer.

## Risks
Changing CPython’s `poll`, `selectors`, `wait4`, or subprocess wait behavior from this evidence would risk altering documented blocking semantics and signal/EINTR behavior for all Python users while only addressing a likely supervisord policy loop.

The raw investigation artifact directory and `supervisord` executable/config are not present in this workspace, so the collected evidence cannot currently be independently replayed here.

## Validation
Before reporting any source patch, try the project build entrypoint from the workspace root: `

[truncated]

Issue page: /issues/019dffa1-4d5d-7581-802b-5a04a98c6a50. Issue JSON: /v1/issues/019dffa1-4d5d-7581-802b-5a04a98c6a50

sshd-session is stuck in a likely unclassified userspace loop: 25.00% of sampled CPU passed through kfree, with repeated thread backtraces show 1 thread(s) around 0x00007efcc509a7d2 in ?? () from target:<path>.

## 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): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `openssh` 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. 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. 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.

A previous Fixer patch attempt already exists for this issue. It was generated by Fixer `0.148.0`. Review that patch before changing code, improve it instead of starting blind, and clean up anything awkward or underexplained. In particular, remove avoidable `goto`, tighten the explanation of what the patch is doing, and make the resulting diff feel ready for upstream git review.
- Prior patch: `./prior-best.patch`
- Prior published session: `./prior-best-session.md`

Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `openssh` 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. 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 (local metadata check)

Local metadata consistency check

## Refinement Pass 1

You are refining a fixer patch after an explicit code review.

Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Read the latest author response at `./patch-output.txt`. Read the review report at `./review-1-output.txt`. This is refinement round 1. The original pre-edit snapshot is available at `./source` if you need to compare the current patch against it. Re-read the planning pass at `./plan-output.txt` before editing. The workspace currently changes these repo-relative paths: regress/authorized_keys_root, regress/ecdsa-sha2-nistp256, regress/ecdsa-sha2-nistp256.pub, regress/ecdsa-sha2-nistp384, regress/ecdsa-sha2-nistp384.pub, regress/ecdsa-sha2-nistp521, regress/ecdsa-sha2-nistp521.pub, regress/host.sk-ecdsa-sha2-nistp256@openssh.com, regress/host.sk-ssh-ed25519@openssh.com, regress/log/20260512T082706.051409.ssh.346.log, regress/sk-ecdsa-sha2-nistp256@openssh.com, regress/sk-ecdsa-sha2-nistp256@openssh.com.pub, regress/sk-ssh-ed25519@openssh.com, regress/sk-ssh-ed25519@openssh.com.pub, regress/ssh-ed25519, regress/ssh-ed25519.pub, regress/ssh-rsa, regress/ssh-rsa.pub, regress/sshd-log-wrapper.sh. Either keep that exact set synchronized with `## Git Add Paths` and `## Issue Connection`, or revert any unintended file before you answer.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `openssh` 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): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout. Address the review findings with the smallest reasonable follow-up changes. If the review identifies a runtime or correctness bug in the changed code, you must update the code itself before answering; a metadata-only response is not sufficient. Keep the patch upstream-friendly, use local project helpers and compat APIs when available, avoid awkward control flow when a simpler structure will do, keep the final response gittable, make the maintainer-facing explanation plain and direct, keep `## Evidence Confidence` honest, add short comments for any non-obvious translation or remapping logic, run relevant project-level build/tests from the workspace root before narrower checks when possible, try a bounded independent reproduction command/test if the review or plan shows one is safe, and summarize which review findings you addressed.

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. 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.

[truncated 3919 bytes]

## Plan Pass

## Problem

Fixer observed `sshd-session: gis [priv]` in a runaway-process investigation, but the bundle shows an indirect signal: sleeping in `poll`/`restart_syscall`, `wchan=poll_schedule_timeout.constprop.0`, one strace line over 5s, and only `0.3%` total CPU across sampled `sshd-session` processes. This looks consistent with a normal privileged monitor waiting for child/session events, not a confirmed OpenSSH userspace busy loop.

## Evidence Confidence

inferred

## Proposed Subject

No patch: require stronger sshd-session loop evidence

## Patch Plan

Do not edit source files in this pass or propose an upstream source patch from the current evidence. Replace the prior Fixer patch rather than improve it as code: `prior-best.patch` adds an unrelated `buildpkg.sh`, which does not address `sshd-session` monitor behavior and should be rejected.

Docs/conventions checked: `README.md`, `README.privsep`, and `regress/README.regress`. Relevant local code/conventions checked include `sshd-session.c` privilege separation setup, `monitor.c:monitor_read()`, `sshd.c` accept-loop `ppoll()`, `packet.c` write-wait polling, and `misc.c` `ptimeout_*` helpers. Local APIs/conventions to follow if stronger evidence later justifies a patch: `fatal_f`/`error_f`/`debug_f`, `ssh_signal()`, `xmalloc`/`xcalloc`, `atomicio`, `ptimeout_*`, and OpenSSH poll/ppoll compatibility wrappers.

If later symbolized traces or a local test prove an actual spin, scope the patch to the confirmed loop in `monitor.c`, `sshd-session.c`, `serverloop.c`, or the relevant compat wrapper. Prefer simple bounded `continue`/`return` flow matching nearby code; avoid introducing unnecessary `goto`.

## Risks

A speculative timeout or wakeup change could break valid idle SSH sessions or privilege-separation monitor behavior.

A source patch based only on this evidence would be upstream-hostile because the collected signal is consistent with intended blocking wait behavior.

## Validation

First try the project-level entrypoint from the workspace root:

```sh
./configure && make
```

If it fails because generated files or dependencies are missing, record the exact command and failure reason, then run the narrowest relevant reproducible check, such as:

```sh
make sshd-session
```

Bounded independent reproduction attempt:

```sh
make tests LTESTS=connect-privsep
```

If that creates a usable session, sample the spawned `sshd-session` with `strace -ttT -p <pid>` or a symbolized backtrace. Do not claim `reproduced` unless the command shows sustained CPU use or repeated userspace activity attributable to OpenSSH.

## Patch Pass

Subject: no patch: require stronger sshd-session loop evidence

## Commit Message
No source change is proposed. The collected perf, strace, and `/proc` data points at an `sshd-session` privilege-separation monitor sleeping in `poll`, not at a confirmed OpenSSH userspace busy loop. A speculative timeout or wakeup change would risk changing valid idle-session behavior without addressing a demonstrated bug.

## Evidence Confidence
inferred

## Issue Connection
The likely root cause from the collected signal is normal blocking monitor behavior, not a proven runaway loop. The evidence shows `sshd-session: gis [priv]` with a backtrace through libc `poll`, `/proc` state `S (sleeping)`, `wchan=poll_schedule_timeout.constprop.0`, a single `restart_syscall` line over 5 seconds, and only `0.3%` total CPU across sampled `sshd-session` processes. The hot samples are kernel memory-management symbols, not symbolized OpenSSH frames.

I made no source change. The prior Fixer patch adding `buildpkg.sh` was not applied because it is unrelated to the `sshd-session` evidence and is not an upstreamable fix for this report.

Docs and conventions checked: `README.md`, `README.privsep`, `regress/README.regress`, `monitor.c:monitor_read()`, `sshd-session.c` privilege separation setup, `sshd.c` polling, `packet.c` write waiting, and `misc.c` `ptimeout_*`. Relevant local helpers/conventions include `fatal_f`/`error_f`/`debug_f`, `ssh_signal()`, `xmalloc`/`xcalloc`, `atomicio`, `ptimeout_*`, and OpenSSH poll/ppoll compatibility wrappers. No helper was needed because no code is changing.

The expected effect is to avoid shipping a speculative patch until there is symbolized or reproducible evidence of an actual OpenSSH busy loop.

## Git Add Paths
None

## Validation
`./configure && make` failed from the workspace root with: `configure: error: ./configure.ac newer than configure, run autoreconf`.

Fallback build succeeded:

```sh
autoreconf && ./configure && make sshd-session
```

Bounded reproduction attempt:

```sh
make tests LTESTS=connect-privsep
```

This built prerequisites but failed before exercising a privsep session: `Unsupported option UsePAM`, `Missing privilege separation directory: /var/empty`, and `FATAL: sshd_proxy broken`.

Smoke check:

```sh
./sshd-session
```

It exited with `sshd-session should not be executed directly`, so it is not a standalone reproducer. No command reproduced sustained CPU use or a userspace loop. Tracked source diff is clean after validation cleanup.

## Review Pass 1 (local metadata check)

RESULT: fix-needed

## Findings
1. Patch metadata drift: the workspace currently changes `regress/authorized_keys_root`, `regress/ecdsa-sha2-nistp256`, `regress/ecdsa-sha2-nistp256.pub`, `regress/ecdsa-sha2-nistp384`, `regress/ecdsa-sha2-nistp384.pub`, `regress/ecdsa-sha2-nistp521`, `regress/ecdsa-sha2-nistp521.pub`, `regress/host.sk-ecdsa-sha2-nistp256@openssh.com`, `regress/host.sk-ssh-ed25519@openssh.com`, `regress/log/20260512T082706.051409.ssh.346.log`, `regress/sk-ecdsa-sha2-nistp256@openssh.com`, `regress/sk-ecdsa-sha2-nistp256@openssh.com.pub`, `regress/sk-ssh-ed25519@openssh.com`, `regress/sk-ssh-ed25519@openssh.com.pub`, `regress/ssh-ed25519`, `regress/ssh-ed25519.pub`, `regress/ssh-rsa`, `regress/ssh-rsa.pub`, `regress/sshd-log-wrapper.sh`, but `## Git Add Paths` lists `None`. Update `## Git Add Paths` to match the real shipped file set exactly, and make sure `## Issue Connection` explains every functional file that remains in the patch.
2. Missing from `## Git Add Paths`: `regress/authorized_keys_root`, `regress/ecdsa-sha2-nistp256`, `regress/ecdsa-sha2-nistp256.pub`, `regress/ecdsa-sha2-nistp384`, `regress/ecdsa-sha2-nistp384.pub`, `regress/ecdsa-sha2-nistp521`, `regress/ecdsa-sha2-nistp521.pub`, `regress/host.sk-ecdsa-sha2-nistp256@openssh.com`, `regress/host.sk-ssh-ed25519@openssh.com`, `regress/log/20260512T082706.051409.ssh.346.log`, `regress/sk-ecdsa-sha2-nistp256@openssh.com`, `regress/sk-ecdsa-sha2-nistp256@openssh.com.pub`, `regress/sk-ssh-ed25519@openssh.com`, `regress/sk-ssh-ed25519@openssh.com.pub`, `regress/ssh-ed25519`, `regress/ssh-ed25519.pub`, `regress/ssh-rsa`, `regress/ssh-rsa.pub`, `regress/sshd-log-wrapper.sh`.
2. Listed in `## Git Add Paths` but not actually changed: `None`.

## Refinement Pass 1

Subject: no patch: require stronger sshd-session loop evidence

## Commit Message
No source change is proposed. The collected perf, strace, and `/proc` data points at an `sshd-session` privilege-separation monitor sleeping in `poll`, not at a confirmed OpenSSH userspace busy loop.

## Evidence Confidence
inferred

## Issue Connection
The collected signal is indirect: `sshd-session: gis [priv]` was captured with a backtrace through libc `poll`, `/proc` state `S (sleeping)`, `wchan=poll_schedule_timeout.constprop.0`, one `restart_syscall` line over 5 seconds, and only `0.3%` total CPU across sampled `sshd-session` processes. The hot samples are kernel memory-management symbols, not symbolized OpenSSH frames.

I made no source change. I addressed the review finding by deleting the generated regression artifacts left from validation, so the workspace now matches `Git Add Paths: None`. The prior Fixer `buildpkg.sh` patch remains rejected as unrelated.

Docs and conventions checked: `README.md`, `README.privsep`, `regress/README.regress`, `monitor.c:monitor_read()`, `sshd-session.c`, `sshd.c`, `packet.c`, and `misc.c` `ptimeout_*`. Relevant helpers include `fatal_f`/`error_f`/`debug_f`, `ssh_signal()`, `xmalloc`/`xcalloc`, `atomicio`, `ptimeout_*`, and poll/ppoll compat wrappers. No helper was needed because no code is changing.

The expected effect is to avoid shipping a speculative upstream patch until there is symbolized or reproducible evidence of an actual OpenSSH busy loop.

## Git Add Paths
None

## Validation
Review finding addressed: removed unintended generated regression artifacts. `git status --short` and `git diff --stat` are now clean.

Prior validation remains applicable: `./configure && make` failed with `configure: error: ./configure.ac newer than configure, run autoreconf`; `autoreconf && ./configure && make sshd-session` succeeded; `make tests LTESTS=connect-privsep` failed before exercising privsep due to `Unsupported option UsePAM`, missing `/var/empty`, and `FATAL: sshd_proxy broken`. No command reproduced sustained CPU use or a userspace loop.

## Review Pass 2

RESULT: ok

The workspace is clean (`git status --short` has no output), so `## Git Add Paths: None` matches the actual patch state.

The refined response keeps evidence confidence at `inferred`, does not claim a reproduced OpenSSH bug, rejects the unrelated prior `buildpkg.sh` patch, and explains why the collected `poll`/sleeping-state evidence is insufficient for an upstream source change. Validation is adequately reported for a no-patch diagnosis, including the project-level `./configure && make` blocker and the bounded `connect-privsep` reproduction attempt.

## Plan Pass

## Problem

Fixer observed `sshd-session: gis [priv]` in a runaway-process investigation, but the bundle shows an indirect signal: sleeping in `poll`/`restart_syscall`, `wchan=poll_schedule_timeout.constprop.0`, one strace line over 5s, and only `0.3%` total CPU across sampled `sshd-session` processes. This looks consistent with a normal privileged monitor waiting for child/session events, not a confirmed OpenSSH userspace busy loop.

## Evidence Confidence

inferred

## Proposed Subject

No patch: require stronger sshd-session loop evidence

## Patch Plan

Do not edit source files in this pass or propose an upstream source patch from the current evidence. Replace the prior Fixer patch rather than improve it as code: `prior-best.patch` adds an unrelated `buildpkg.sh`, which does not address `sshd-session` monitor behavior and should be rejected.

Docs/conventions checked: `README.md`, `README.privsep`, and `regress/README.regress`. Relevant local code/conventions checked include `sshd-session.c` privilege separation setup, `monitor.c:monitor_read()`, `sshd.c` accept-loop `ppoll()`, `packet.c` write-wait polling, and `misc.c` `ptimeout_*` helpers. Local APIs/conventions to follow if stronger evidence later justifies a patch: `fatal_f`/`error_f`/`debug_f`, `ssh_signal()`, `xmalloc`/`xcalloc`, `atomicio`, `ptimeout_*`, and OpenSSH poll/ppoll compatibility wrappers.

If later symbolized traces or a local test prove an actual spin, scope the patch to the confirmed loop in `monitor.c`, `sshd-session.c`, `serverloop.c`, or the relevant compat wrapper. Prefer simple bounded `continue`/`return` flow matching nearby code; avoid introducing unnecessary `goto`.

## Risks

A speculative timeout or wakeup change could break valid idle SSH sessions or privilege-separation monitor behavior.

A source patch based only on this evidence would be upstream-hostile because the collected signal is consistent with intended blocking wait behavior.

## Validation

First try the project-level entrypoint from the workspace root:

```sh
./configure && make
```

If it fails because generated files or dependencies are missing, record the exact command and failure reason, then run the narrowest relevant reproducible check, such as:

```sh
make sshd-session
```

Bounded independent reproduction attempt:

```sh
make tests LTESTS=connect-privsep
```

If that creates a usable ses

[truncated]

Issue page: /issues/019e0f77-fd2f-7ef3-9c33-5cae8af4813f. Issue JSON: /v1/issues/019e0f77-fd2f-7ef3-9c33-5cae8af4813f

postgres is stuck in a likely busy poll loop: 11.19% of sampled CPU passed through hash_search_with_hash_value, with repeated thread backtraces show 1 thread(s) around 0x00007f322d29a7d2 in ?? () from target:<path>.

## 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): `./configure && make`, `meson setup build-fix && meson compile -C build-fix && meson test -C build-fix`, `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `postgresql-18` 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. 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. 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.

A previous Fixer patch attempt already exists for this issue. It was generated by Fixer `0.148.0`. Review that patch before changing code, improve it instead of starting blind, and clean up anything awkward or underexplained. In particular, remove avoidable `goto`, tighten the explanation of what the patch is doing, and make the resulting diff feel ready for upstream git review.
- Prior patch: `./prior-best.patch`
- Prior published session: `./prior-best-session.md`

Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `./configure && make`, `meson setup build-fix && meson compile -C build-fix && meson test -C build-fix`, `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `postgresql-18` 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. 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 `postgresql-18` 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): `./configure && make`, `meson setup build-fix && meson compile -C build-fix && meson test -C build-fix`, `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, 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 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 `postgres` as a likely busy-poll loop, but the embedded evidence does not show a completed tight loop. The sampled postmaster stack is `main()` -> `PostmasterMain()` -> `WaitEventSetWait()` -> `epoll_wait()`, while `/proc` says the process was sleeping in `do_epoll_wait`, total CPU was low, and strace includes only one unfinished `epoll_wait(8` line.

## Evidence Confidence
inferred

## Proposed Subject
No patch: require direct postmaster busy-wait evidence before source changes

## Patch Plan
Do not edit source yet. Treat this as a no-patch diagnosis/report unless stronger evidence is collected.

I found `README.md`, `doc/`, and `.github/CONTRIBUTING.md`, which points contributors to PostgreSQL’s developer documentation. No subsystem-local README was present under the inspected postmaster/wait-event paths.

Relevant local conventions and helpers are PostgreSQL’s `WaitEventSet`/latch APIs: `CreateWaitEventSet()`, `AddWaitEventToSet()`, `WaitEventSetWait()`, `ResetLatch()`, plus `ereport`/`elog`. The implicated code is `ServerLoop()` and `DetermineSleepTime()` in `src/backend/postmaster/postmaster.c`, and the epoll backend in `src/backend/storage/ipc/waiteventset.c`.

`DetermineSleepTime()` intentionally returns `0` while `StartWorkerNeeded` is set, but `maybe_start_bgworkers()` bounds each pass and clears or reasserts that state deliberately. Without evidence of repeated immediate-return `epoll_wait(..., 0)` calls or a stuck background-worker state, a source patch would be speculative.

The prior Fixer patch should be replaced, not improved in-place: it includes generated build artifacts such as `GNUmakefile` and `objfiles.txt`, not an upstream-ready source fix. If later evidence proves a real loop, prefer a small bounded state-machine fix near `DetermineSleepTime()`/`maybe_start_bgworkers()` using existing wait/latch helpers and avoid avoidable `goto`.

## Risks
A speculative change could delay legitimate postmaster work, including background worker launch, crash recovery, shutdown, reload handling, or connection acceptance.

Misclassifying a normal blocking `epoll_wait()` sample as a PostgreSQL bug would be hard to justify upstream.

## Validation
First try the workspace-root entrypoint: `./configure && make`. If that fails, record the exact command and failure reason, then use the narrowest relevant compile such as `make -C src/backend/postmaster` and `make -C src/backend/storage/ipc`.

Bounded independent signal check: if safe, start a temporary PostgreSQL data directory with the built binaries and run `timeout 5 strace -tt -e epoll_wait -p <postmaster-pid>`. Only classify as `reproduced` if that shows repeated completed immediate-return `epoll_wait` calls matching the reported signal.

## Patch Pass

Subject: No patch: diagnose postmaster wait-loop signal

## Commit Message
No source change. The collected perf, strace, and `/proc` evidence points to a postmaster sampled in PostgreSQL’s `WaitEventSet` wait path, but it does not prove a busy poll loop. The prior Fixer patch consisted of generated build artifacts rather than an upstreamable source fix, so I did not carry it forward.

## Evidence Confidence
inferred

## Issue Connection
Fixer reported a likely busy-poll loop in `postgres`: the sampled stack passed through `PostmasterMain()`, `WaitEventSetWait()`, and `epoll_wait()`, with `hash_search_with_hash_value` as the hottest PostgreSQL symbol. The same evidence says the sampled process was sleeping, `wchan` was `do_epoll_wait`, total CPU was low, and the strace excerpt contains only one unfinished `epoll_wait(8` line.

The cautious code-level inference is that the postmaster was normally blocked in PostgreSQL’s event-set abstraction. I inspected `ServerLoop()` and `DetermineSleepTime()` in `src/backend/postmaster/postmaster.c`, plus `WaitEventSetWait()` in `src/backend/storage/ipc/waiteventset.c`. The relevant local helpers and conventions are `CreateWaitEventSet()`, `AddWaitEventToSet()`, `WaitEventSetWait()`, `ResetLatch()`, and `ereport`/`elog`. `DetermineSleepTime()` can intentionally return zero while background workers need service, and `maybe_start_bgworkers()` bounds that work.

I made no source change because the evidence is profiler/trace-indirect and I could not collect a stronger local signal showing repeated completed immediate-return `epoll_wait(..., 0)` calls. The expected effect is to avoid an upstream-unready behavioral change until a real nonblocking postmaster loop is demonstrated.

I followed the saved plan. The prior Fixer patch should be replaced, not refined, because it adds generated files such as `GNUmakefile` and `objfiles.txt` rather than changing source.

## Git Add Paths
None

## Validation
Ran `./configure && make` from the workspace root: passed.

For the bounded independent reproduction attempt, I tried to initialize a temporary local PostgreSQL node and sample the postmaster with `strace -e epoll_wait`. The uninstalled `src/bin/initdb/initdb -D /tmp/pgfixer-89130-data.JheiyB` failed because `postgres` was not in the same directory. I then ran `make install DESTDIR=/tmp/pgfixer-89130-install.TDdsFe`: passed.

The installed `initdb` failed as root with `initdb: error: cannot be run as root`. Attempts to switch to an unprivileged user were blocked by the sandbox: `setpriv --reuid=65534 --regid=65534 --clear-groups ...` failed with `setresuid failed: Invalid argument`, and `runuser -u nobody -- ...` failed with `cannot set groups: Operation not permitted`. I therefore could not independently reproduce the reported busy-poll signal.

The raw investigation directory referenced by `evidence.json` was not present, so I used only the embedded evidence excerpts. After validation, I ran `make distclean`; `git status --short` is clean.

## Review Pass 1

RESULT: ok

No source changes are present, and `## Git Add Paths` correctly lists `None`, so `inferred` evidence confidence is appropriate.

The author’s diagnosis matches the evidence limits: the bundle has a sleeping postmaster in `epoll_wait`, low CPU, and only one unfinished strace line, so rejecting a speculative source patch is reasonable. The response also names the relevant PostgreSQL local helpers and conventions and explains why the prior generated-artifact patch should not be carried forward.

Validation is acceptable for a no-patch pass: `./configure && make` was run from the workspace root and passed, and the bounded runtime reproduction attempt is documented with concrete blockers.

## Plan Pass

## Problem
Fixer reported `postgres` as a likely busy-poll loop, but the embedded evidence does not show a completed tight loop. The sampled postmaster stack is `main()` -> `PostmasterMain()` -> `WaitEventSetWait()` -> `epoll_wait()`, while `/proc` says the process was sleeping in `do_epoll_wait`, total CPU was low, and strace includes only one unfinished `epoll_wait(8` line.

## Evidence Confidence
inferred

## Proposed Subject
No patch: require direct postmaster busy-wait evidence before source changes

## Patch Plan
Do not edit source yet. Treat this as a no-patch diagnosis/report unless stronger evidence is collected.

I found `README.md`, `doc/`, and `.github/CONTRIBUTING.md`, which points contributors to PostgreSQL’s developer documentation. No subsystem-local README was present under the inspected postmaster/wait-event paths.

Relevant local conventions and helpers are PostgreSQL’s `WaitEventSet`/latch APIs: `CreateWaitEventSet()`, `AddWaitEventToSet()`, `WaitEventSetWait()`, `ResetLatch()`, plus `ereport`/`elog`. The implicated code is `ServerLoop()` and `DetermineSleepTime()` in `src/backend/postmaster/postmaster.c`, and the epoll backend in `src/backend/storage/ipc/waiteventset.c`.

`DetermineSleepTime()` intentionally returns `0` while `StartWorkerNeeded` is set, but `maybe_start_bgworkers()` bounds each pass and clears or reasserts that state deliberately. Without evidence of repeated immediate-return `epoll_wait(..., 0)` calls or a stuck background-worker state, a source patch would be speculative.

The prior Fixer patch should be replaced, not improved in-place: it includes generated build artifacts such as `GNUmakefile` and `objfiles.txt`, not an upstream-ready source fix. If later evidence proves a real loop, prefer a small bounded state-machine fix near `DetermineSleepTime()`/`maybe_start_bgworkers()` using existing wait/latch helpers and avoid avoidable `goto`.

## Risks
A speculative change could delay legitimate postmaster work, including background worker launch, crash recovery, shutdown, reload handling, or connection acceptance.

Misclassifying a normal blocking `epoll_wait()` sample as a PostgreSQL bug would be hard to justify upstream.

## Validation
First try the workspace-root entrypoint: `./configure && make`. If that fails, record the exact command and failure reason, then use the narrowest relevant compile such

[truncated]

Issue page: /issues/019dbf42-24af-73f1-a197-6c20f09e1ef5. Issue JSON: /v1/issues/019dbf42-24af-73f1-a197-6c20f09e1ef5

sshd-session is stuck in a likely unclassified userspace loop: 21.01% of sampled CPU passed through security_inode_alloc, with repeated thread backtraces show 1 thread(s) around 0x00007f41d749a7d2 in ?? () from target:<path>.

## 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): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `openssh` 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. 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. 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.

A previous Fixer patch attempt already exists for this issue. It was generated by Fixer `0.148.0`. Review that patch before changing code, improve it instead of starting blind, and clean up anything awkward or underexplained. In particular, remove avoidable `goto`, tighten the explanation of what the patch is doing, and make the resulting diff feel ready for upstream git review.
- Prior patch: `./prior-best.patch`
- Prior published session: `./prior-best-session.md`

Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `openssh` 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. 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 `openssh` 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): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, 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 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

`sshd-session` was sampled in a low-confidence runaway-process investigation. The captured process was sleeping in `poll`/`restart_syscall`, with stripped OpenSSH frames and hot samples mostly in kernel/libnss-systemd paths (`security_inode_alloc`, `_raw_spin_lock_irqsave`, `do_epoll_ctl`, unresolved `libnss_systemd.so.2`). The evidence does not identify a confirmed OpenSSH source loop.

## Evidence Confidence

inferred

## Proposed Subject

No upstream source patch yet: replace the prior Fixer patch with a diagnosis/report plan that asks for symbolized evidence before editing OpenSSH session or monitor code.

## Patch Plan

Do not carry forward the prior Fixer patch. It appears to add generated/packaging material such as `buildpkg.sh`/`configure` content and does not address the sampled `sshd-session` execution path.

Use the application entrypoint evidence first: `sshd-session`, then inspect `sshd-session.c`, `serverloop.c`, `monitor.c`, `monitor_wrap.c`, and poll compatibility only as context. I found relevant local conventions/helpers: `atomicio` for fd IO, `ssh_signal` for signals, `ptimeout`/`monotime` for loop deadlines, `fatal_f`/`debug*_f` for logging, `xcalloc`/`xrecallocarray` for allocation, and monitor IPC helpers `mm_request_*`.

If later symbolized evidence points to a real OpenSSH loop, patch the narrow local loop with those helpers and existing OpenSSH style. Avoid awkward control flow such as adding a broad `goto`; use bounded loop conditions or direct error/EOF handling where possible. Do not edit generated files unless the project’s upstream workflow requires regenerating them from `configure.ac`.

## Risks

A source change based only on this evidence would be speculative. The sampled process was sleeping, total CPU was only 0.1%, and the hot path implicates kernel/NSS/systemd activity more than named OpenSSH code. A defensive poll-loop tweak could mask symptoms without fixing the actual source, or introduce regressions in session, monitor, or channel wakeup behavior.

## Validation

Before any focused check, try the project-level entrypoint from the workspace root:

```sh
./configure && make
```

If that fails due to missing dependencies or generated files, record the exact command and failure reason, then run the narrowest relevant build such as:

```sh
make sshd-session
```

For a bounded independent reproduction attempt, build with symbols if feasible and run a local `sshd-session`/test `sshd` smoke path under `strace -f -tt -e poll,ppoll,restart_syscall` or `gdb` to see whether an OpenSSH frame repeatedly returns immediately from `poll`/`ppoll`. Do not claim reproduction unless that command actually shows the failure signal.

## Patch Pass

Subject: diagnose sshd-session poll-wait sample

## Commit Message
No source change is included. The collected perf, strace, and `/proc` evidence points to `sshd-session` sleeping in `poll`, with hot samples in kernel/NSS/systemd paths rather than a symbolized OpenSSH loop.

## Evidence Confidence
inferred

## Issue Connection
The collected signal was a Fixer runaway-process investigation for `sshd-session`: the process state was `S (sleeping)`, `wchan` was `poll_schedule_timeout`, strace saw only `restart_syscall(<... resuming interrupted poll ...>)`, and the profile target reported 0.1% total CPU across three `sshd-session` processes. The hottest symbols were `security_inode_alloc`, `_raw_spin_lock_irqsave`, `do_epoll_ctl`, and an unresolved `libnss_systemd.so.2` frame.

The cautious root-cause inference is that the sampled OpenSSH process was blocked in its normal event loop while profiler attribution came from kernel/NSS/systemd activity outside a clear OpenSSH source frame. I inspected the relevant `sshd-session`, `serverloop`, `monitor`, and poll-compatibility paths; nearby code already uses OpenSSH’s local conventions and helpers such as `ppoll`/`poll`, `ptimeout_*`, `monotime`, `channel_prepare_poll`, `atomicio`, `ssh_signal`, `fatal_f`/`fatal_fr`, `debug*` logging, `sshbuf`, and `xmalloc`/`xrecallocarray`.

I made no source change because the evidence is indirect and not pull-request-ready for an upstream OpenSSH patch. This also replaces the prior Fixer patch attempt: its stored diff added unrelated generated/packaging content (`buildpkg.sh`) and should not be carried forward. The expected effect is a clean diagnosis for upstream follow-up instead of a speculative event-loop change that could regress idle session behavior.

## Git Add Paths
None

## Validation
`./configure && make` from the workspace root completed successfully after restoring generated files from the original source snapshot.

Before that restoration, the same command failed with the exact generated-file blocker: `configure: error: ./configure.ac newer than configure, run autoreconf`. I then ran `autoreconf && ./configure --with-privsep-path=/tmp/openssh-fixer-88891/empty && make`, which completed successfully, and cleaned/restored generated validation artifacts afterward. Final `git status --short` was clean.

Bounded reproduction attempt: I created a temporary localhost `sshd` config and host key under `/tmp` and tried to start the built daemon to sample a live `sshd-session` with `ps`/`strace`. The first run failed because `sshd` requires an absolute executable path. Retrying with the absolute path still did not produce a sampleable `sshd-session`: the sandbox reported `socket: Operation not permitted` and `Cannot bind any address` (the temporary config also logged unsupported `UsePAM` for this build). The collected failure signal was not reproduced locally, so confidence remains `inferred`.

## Review Pass 1

RESULT: ok

The workspace is clean: `git status --short`, `git diff --stat`, and `git diff --` show no source changes. That matches the author’s `## Git Add Paths: None` and the `inferred` evidence classification.

The response correctly treats the evidence as indirect: the bundle shows `sshd-session` sleeping in `poll`/`restart_syscall`, only 0.1% total CPU across sampled processes, and hot symbols in kernel/NSS/systemd paths rather than a symbolized OpenSSH loop. The no-patch diagnosis is appropriate and avoids carrying forward the unrelated prior `buildpkg.sh` patch.

The author also satisfies the review requirements: they checked the project-level build path, reported the earlier generated-file blocker, ran a successful workspace-root `./configure && make`, attempted a bounded `sshd-session` reproduction, and kept confidence at `inferred` when sandbox socket permissions prevented sampling a live session.

## Plan Pass

## Problem

`sshd-session` was sampled in a low-confidence runaway-process investigation. The captured process was sleeping in `poll`/`restart_syscall`, with stripped OpenSSH frames and hot samples mostly in kernel/libnss-systemd paths (`security_inode_alloc`, `_raw_spin_lock_irqsave`, `do_epoll_ctl`, unresolved `libnss_systemd.so.2`). The evidence does not identify a confirmed OpenSSH source loop.

## Evidence Confidence

inferred

## Proposed Subject

No upstream source patch yet: replace the prior Fixer patch with a diagnosis/report plan that asks for symbolized evidence before editing OpenSSH session or monitor code.

## Patch Plan

Do not carry forward the prior Fixer patch. It appears to add generated/packaging material such as `buildpkg.sh`/`configure` content and does not address the sampled `sshd-session` execution path.

Use the application entrypoint evidence first: `sshd-session`, then inspect `sshd-session.c`, `serverloop.c`, `monitor.c`, `monitor_wrap.c`, and poll compatibility only as context. I found relevant local conventions/helpers: `atomicio` for fd IO, `ssh_signal` for signals, `ptimeout`/`monotime` for loop deadlines, `fatal_f`/`debug*_f` for logging, `xcalloc`/`xrecallocarray` for allocation, and monitor IPC helpers `mm_request_*`.

If later symbolized evidence points to a real OpenSSH loop, patch the narrow local loop with those helpers and existing OpenSSH style. Avoid awkward control flow such as adding a broad `goto`; use bounded loop conditions or direct error/EOF handling where possible. Do not edit generated files unless the project’s upstream workflow requires regenerating them from `configure.ac`.

## Risks

A source change based only on this evidence would be speculative. The sampled process was sleeping, total CPU was only 0.1%, and the hot path implicates kernel/NSS/systemd activity more than named OpenSSH code. A defensive poll-loop tweak could mask symptoms without fixing the actual source, or introduce regressions in session, monitor, or channel wakeup behavior.

## Validation

Before any focused check, try the project-level entrypoint from the workspace root:

```sh
./configure && make
```

If that fails due to missing dependencies or generated files, record the exact command and failure reason, then run the narrowest relevant build such as:

```sh
make sshd-session
```

For a bounded independent reprodu

[truncated]

Issue page: /issues/019e03a2-989b-7ce3-9651-23cf25b5a249. Issue JSON: /v1/issues/019e03a2-989b-7ce3-9651-23cf25b5a249

sshd-session is stuck in a likely unclassified userspace loop: 24.39% of sampled CPU passed through native_flush_tlb_one_user, with repeated thread backtraces show 1 thread(s) around 0x00007fc38ce9a7d2 in ?? () from target:<path>.

## 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): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `openssh` 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. 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. 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.

A previous Fixer patch attempt already exists for this issue. It was generated by Fixer `0.148.0`. Review that patch before changing code, improve it instead of starting blind, and clean up anything awkward or underexplained. In particular, remove avoidable `goto`, tighten the explanation of what the patch is doing, and make the resulting diff feel ready for upstream git review.
- Prior patch: `./prior-best.patch`
- Prior published session: `./prior-best-session.md`

Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `openssh` 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. 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 `openssh` 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): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, 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 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 labelled `sshd-session` as runaway CPU, but the available evidence does not show a confirmed OpenSSH busy loop. The bundle reports `S (sleeping)`, `wchan` in `poll_schedule_timeout`, one `restart_syscall` from a resumed `poll`, and only `0.1%` total CPU across three `sshd-session` processes.

## Evidence Confidence
inferred

## Proposed Subject
No patch: treat sshd-session sample as inconclusive poll evidence

## Patch Plan
Do not edit OpenSSH from this bundle. A source patch would be speculative because the evidence is profiler/trace-only, low-confidence, and conflicts with the runaway label.

Replace the prior Fixer patch: deleting `contrib/hpux/sshd` is unrelated to `sshd-session` polling and should not be carried forward.

If stronger evidence is collected before editing, inspect `serverloop.c:wait_until_can_do_something()` and `server_loop2()`. Any patch should follow existing OpenSSH conventions and helpers: `ptimeout_*()` for poll deadlines, `monotime()`/`monotime_ts()` for time, `channel_prepare_poll()`/`channel_after_poll()` for channel fd state, `ssh_signal()` plus `sigprocmask()`/`ppoll()` for signal-safe waiting, and straight-line bounded control flow instead of avoidable `goto`.

Only `README.md` was found among the requested contribution/style docs; no relevant `CONTRIBUTING`, `HACKING`, `README-hacking`, `docs/`, or `dev-docs/` entry was found. The raw artifact paths referenced by the evidence bundle were not available in this workspace, so the embedded excerpts are the evidence limit.

## Risks
Changing the post-auth server loop without direct reproduction could regress keepalives, rekey timing, child cleanup, channel I/O, or idle connection timeout behavior. Adding sleeps or suppressing wakeups would be especially risky without evidence that OpenSSH is repeatedly waking from `ppoll()`.

## Validation
Before any focused compile or smoke check, try from the workspace root:

```sh
./configure && make
```

If that succeeds, try the documented broader test entrypoint:

```sh
make tests
```

Bounded reproduction attempt: run a local high-port test `sshd` with temporary config/keys if the environment permits, connect once, and sample the child `sshd-session` with `strace`/`perf` for repeated immediate `poll`/`ppoll` wakeups or high CPU. Only claim `reproduced` if that command actually shows the failure signal; otherwise keep this as a no-patch diagnosis with `inferred` confidence.

## Patch Pass

Subject: No patch: treat sshd-session sample as inconclusive poll evidence

## Commit Message
No source change was made. The collected perf, strace, and `/proc` excerpts point to an `sshd-session` process blocked in the normal post-auth poll wait, not to a confirmed OpenSSH busy loop.

## Evidence Confidence
inferred

## Issue Connection
The collected signal was labelled as runaway CPU, but the concrete evidence is contradictory: `/proc` reported the process in `S (sleeping)`, `wchan` was `poll_schedule_timeout.constprop.0`, the kernel stack was under `poll`, `strace` captured only one resumed `poll`, and the target summary reported only `0.1%` total CPU across three `sshd-session` processes.

The likely root cause is an inconclusive or misclassified sample of the normal `serverloop.c` post-auth event loop waiting in `ppoll()`. That code already follows OpenSSH’s local conventions: `ptimeout_*()` for poll deadlines, `monotime()` for time, `channel_prepare_poll()`/`channel_after_poll()` for channel fd state, and `ssh_signal()` with `sigprocmask()`/`ppoll()` for signal-safe child handling.

I made no source change and did not carry forward the prior Fixer patch, which deleted unrelated `contrib/hpux/sshd`. The expected effect is no behavior change; this avoids speculatively changing keepalive, rekey, channel I/O, child cleanup, or idle-timeout behavior without reproduced or stronger observed evidence.

Only `README.md` was found among the requested contribution/style docs. The raw artifact paths named in `evidence.json` were not available in this workspace, so the embedded evidence excerpts were the limit.

## Git Add Paths
None

## Validation
Ran `./configure && make` from the workspace root first. It failed immediately with:

```text
configure: error: ./configure.ac newer than configure, run autoreconf
```

Ran `autoreconf`; it completed with obsolete `AC_TRY_COMPILE` warnings. Reran `./configure && make`; it completed successfully.

Ran `make tests`; it completed successfully.

Independent reproduction attempt:
`./sshd-session` exited with `sshd-session should not be executed directly`, so it did not exercise the post-auth poll loop. `timeout 5s strace -f -tt -e trace=poll,ppoll,restart_syscall ./sshd-session` was blocked by ptrace restrictions: `PTRACE_TRACEME: Operation not permitted`. The collected failure signal was not independently reproduced, so confidence remains `inferred`.

Cleaned generated validation artifacts afterward; `git status --short`, `git diff --stat`, and untracked-file checks are clean.

## Review Pass 1

RESULT: ok

The no-patch diagnosis is appropriate. The workspace has no source diff, `## Evidence Confidence` is correctly set to `inferred`, and the author does not claim a confirmed OpenSSH bug or a reproduced failure.

The explanation matches the evidence: the bundle shows a sleeping `sshd-session` in `poll`/`poll_schedule_timeout` with only one resumed `poll` in `strace` and low reported CPU, so changing `serverloop.c` would be speculative. The author also correctly rejects the prior unrelated `contrib/hpux/sshd` deletion.

Validation is acceptable: the project-level `./configure && make` was attempted first, the stale `configure` blocker was reported exactly, the regenerated build and `make tests` were run, and the independent reproduction attempt is reported as blocked/not exercising the post-auth loop. Local helper/convention claims line up with the code: `ptimeout_*()`, `monotime()`, `channel_prepare_poll()`, `channel_after_poll()`, `ssh_signal()`, `sigprocmask()`, and `ppoll()` are the relevant server-loop patterns.

## Plan Pass

## Problem
Fixer labelled `sshd-session` as runaway CPU, but the available evidence does not show a confirmed OpenSSH busy loop. The bundle reports `S (sleeping)`, `wchan` in `poll_schedule_timeout`, one `restart_syscall` from a resumed `poll`, and only `0.1%` total CPU across three `sshd-session` processes.

## Evidence Confidence
inferred

## Proposed Subject
No patch: treat sshd-session sample as inconclusive poll evidence

## Patch Plan
Do not edit OpenSSH from this bundle. A source patch would be speculative because the evidence is profiler/trace-only, low-confidence, and conflicts with the runaway label.

Replace the prior Fixer patch: deleting `contrib/hpux/sshd` is unrelated to `sshd-session` polling and should not be carried forward.

If stronger evidence is collected before editing, inspect `serverloop.c:wait_until_can_do_something()` and `server_loop2()`. Any patch should follow existing OpenSSH conventions and helpers: `ptimeout_*()` for poll deadlines, `monotime()`/`monotime_ts()` for time, `channel_prepare_poll()`/`channel_after_poll()` for channel fd state, `ssh_signal()` plus `sigprocmask()`/`ppoll()` for signal-safe waiting, and straight-line bounded control flow instead of avoidable `goto`.

Only `README.md` was found among the requested contribution/style docs; no relevant `CONTRIBUTING`, `HACKING`, `README-hacking`, `docs/`, or `dev-docs/` entry was found. The raw artifact paths referenced by the evidence bundle were not available in this workspace, so the embedded excerpts are the evidence limit.

## Risks
Changing the post-auth server loop without direct reproduction could regress keepalives, rekey timing, child cleanup, channel I/O, or idle connection timeout behavior. Adding sleeps or suppressing wakeups would be especially risky without evidence that OpenSSH is repeatedly waking from `ppoll()`.

## Validation
Before any focused compile or smoke check, try from the workspace root:

```sh
./configure && make
```

If that succeeds, try the documented broader test entrypoint:

```sh
make tests
```

Bounded reproduction attempt: run a local high-port test `sshd` with temporary config/keys if the environment permits, connect once, and sample the child `sshd-session` with `strace`/`perf` for repeated immediate `poll`/`ppoll` wakeups or high CPU. Only claim `reproduced` if that command actually shows the failure signal; otherwi

[truncated]

Issue page: /issues/019e0b30-1564-7f53-89d6-615f456eb98e. Issue JSON: /v1/issues/019e0b30-1564-7f53-89d6-615f456eb98e

sshd-session is stuck in a likely unclassified userspace loop: 100.00% of sampled CPU passed through i40e_lan_select_queue, with repeated thread backtraces show 1 thread(s) around 0x00007f4dfde9a7d2 in ?? () from target:<path>.

## 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): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `openssh` 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. 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. 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.

A previous Fixer patch attempt already exists for this issue. It was generated by Fixer `0.148.0`. Review that patch before changing code, improve it instead of starting blind, and clean up anything awkward or underexplained. In particular, remove avoidable `goto`, tighten the explanation of what the patch is doing, and make the resulting diff feel ready for upstream git review.
- Prior patch: `./prior-best.patch`
- Prior published session: `./prior-best-session.md`

Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `openssh` 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. 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 `openssh` 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): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, 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 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 `sshd-session` as a runaway process, but the bundle does not show an OpenSSH userspace loop. The process was sleeping in `poll`/`restart_syscall` with `wchan` at `poll_schedule_timeout`, while the hot sample was `i40e_lan_select_queue` in the kernel NIC driver.

## Evidence Confidence
inferred

## Proposed Subject
No OpenSSH source patch: diagnose inconclusive `sshd-session` CPU evidence

## Patch Plan
Do not edit OpenSSH source from this evidence. A source patch would be speculative.

Reject/replace the prior Fixer patch: it adds `buildpkg.sh`, which is unrelated to `sshd-session`, the event loop, `poll`, or the collected CPU signal.

Relevant upstream/style findings: no `CONTRIBUTING` or `HACKING` file was found. `README` asks contributors to follow OpenBSD `style(9)`, and `README.md`/`regress/README.regress` document `./configure`, `make`, and `make tests`.

Relevant local conventions/helpers found: `serverloop.c` already uses `channel_prepare_poll()`, `ptimeout_*()` timeout helpers from `misc.c`, `ppoll()`, `ssh_packet_*()` helpers, `sshbuf`, `xmalloc` helpers, and OpenSSH logging/fatal helpers such as `debug_f`, `logit`, `fatal_f`, and `fatal_fr`.

If stronger evidence later proves an OpenSSH loop, patch the smallest bounded path in `serverloop.c`/`packet.c` using those helpers and straight-line control flow. Avoid adding `goto` cleanup unless it matches an existing cleanup pattern and is clearly simpler.

## Risks
Current evidence may describe a kernel/network-driver or measurement issue, not an OpenSSH defect. The userspace frames are unsymbolized, raw investigation artifacts are not available in this workspace, and the sampled process state contradicts a busy userspace spin.

## Validation
Before any focused check, try the project-level entrypoint from the workspace root: `./configure && make`.

If that fails because generated files are stale, report the exact failure; the prior pass saw `configure: error: ./configure.ac newer than configure, run autoreconf`. Then use the reproducible upstream fallback `autoreconf && ./configure && make`.

For a bounded independent reproduction attempt, run a small regression/idle-session smoke check such as `timeout 120s make tests LTESTS=connect`, then sample the resulting `sshd-session` with `ps`/`wchan`/short `strace` if a session starts. Do not claim `reproduced` unless this actually shows a CPU-hot OpenSSH userspace loop.

## Patch Pass

Subject: Diagnose sshd-session CPU sample as inconclusive

## Commit Message
No source patch is proposed. The collected evidence points away from a confirmed OpenSSH userspace loop: `sshd-session` was sleeping in `poll`, while the hot sample was attributed to the kernel `i40e` network driver.

## Evidence Confidence
inferred

## Issue Connection
The collected signal was a Fixer runaway-process investigation for `sshd-session`. Perf attributed the hot path to `i40e_lan_select_queue` in the kernel, strace saw only `restart_syscall(<... resuming interrupted poll ...>)`, and `/proc` showed the process in `S (sleeping)` with `wchan` at `poll_schedule_timeout`. The profile target also reported only 0.1% total CPU for the sampled `sshd-session` processes.

The cautious inference is that this is not enough evidence for an OpenSSH source bug. The relevant server session path in `serverloop.c` already blocks through `channel_prepare_poll()`, `ptimeout_*()` timeout helpers, `ppoll()`, `ssh_packet_*()` helpers, and the usual OpenSSH `debug_f`/`logit`/`fatal_f` conventions. That matches a sleeping event loop, not a tight userspace spin.

I made no source change and did not apply the prior Fixer patch. That prior patch added `buildpkg.sh`, which is unrelated to `sshd-session`, `poll`, the server event loop, or the collected CPU signal. This follows the saved plan.

The expected effect is to leave a clean upstream-ready diagnosis instead of a speculative diff. Stronger evidence needed before editing would be a symbolized userspace stack or a bounded reproduction showing `sshd-session` spinning in OpenSSH code rather than sleeping in `ppoll()`.

## Git Add Paths
None

## Validation
`./configure && make` from the workspace root failed immediately with: `configure: error: ./configure.ac newer than configure, run autoreconf`.

To avoid generated-file churn in the prepared workspace, I copied the tree to `/tmp/openssh-89399-validation.MPRFmL` and ran `autoreconf`, `./configure --with-privsep-path=/tmp/openssh-89399-empty`, and `make`; the build completed successfully.

For the bounded independent reproduction attempt, I ran `timeout 120s make tests LTESTS=connect` in that built temp copy. File tests passed, but the network test failed before producing a usable `sshd-session`: `Unsupported option UsePAM`, then `FATAL: no sshd running on port 4242`. No CPU-hot OpenSSH userspace loop was reproduced, so confidence remains `inferred`.

## Review Pass 1

RESULT: ok

No findings. The author left no source diff, correctly rejected the unrelated prior `buildpkg.sh` patch, used `inferred` for indirect profiler/strace evidence, and did not claim reproduction. The validation reports the required workspace-root `./configure && make` failure with the exact configure freshness blocker, then a reproducible temp-copy fallback build and bounded `connect` smoke attempt. The generated `config.log` in the workspace is ignored by `.gitignore` and is not part of the proposed patch.

## Plan Pass

## Problem
Fixer flagged `sshd-session` as a runaway process, but the bundle does not show an OpenSSH userspace loop. The process was sleeping in `poll`/`restart_syscall` with `wchan` at `poll_schedule_timeout`, while the hot sample was `i40e_lan_select_queue` in the kernel NIC driver.

## Evidence Confidence
inferred

## Proposed Subject
No OpenSSH source patch: diagnose inconclusive `sshd-session` CPU evidence

## Patch Plan
Do not edit OpenSSH source from this evidence. A source patch would be speculative.

Reject/replace the prior Fixer patch: it adds `buildpkg.sh`, which is unrelated to `sshd-session`, the event loop, `poll`, or the collected CPU signal.

Relevant upstream/style findings: no `CONTRIBUTING` or `HACKING` file was found. `README` asks contributors to follow OpenBSD `style(9)`, and `README.md`/`regress/README.regress` document `./configure`, `make`, and `make tests`.

Relevant local conventions/helpers found: `serverloop.c` already uses `channel_prepare_poll()`, `ptimeout_*()` timeout helpers from `misc.c`, `ppoll()`, `ssh_packet_*()` helpers, `sshbuf`, `xmalloc` helpers, and OpenSSH logging/fatal helpers such as `debug_f`, `logit`, `fatal_f`, and `fatal_fr`.

If stronger evidence later proves an OpenSSH loop, patch the smallest bounded path in `serverloop.c`/`packet.c` using those helpers and straight-line control flow. Avoid adding `goto` cleanup unless it matches an existing cleanup pattern and is clearly simpler.

## Risks
Current evidence may describe a kernel/network-driver or measurement issue, not an OpenSSH defect. The userspace frames are unsymbolized, raw investigation artifacts are not available in this workspace, and the sampled process state contradicts a busy userspace spin.

## Validation
Before any focused check, try the project-level entrypoint from the workspace root: `./configure && make`.

If that fails because generated files are stale, report the exact failure; the prior pass saw `configure: error: ./configure.ac newer than configure, run autoreconf`. Then use the reproducible upstream fallback `autoreconf && ./configure && make`.

For a bounded independent reproduction attempt, run a small regression/idle-session smoke check such as `timeout 120s make tests LTESTS=connect`, then sample the resulting `sshd-session` with `ps`/`wchan`/short `strace` if a session starts. Do not claim `reproduced` unless thi

[truncated]

Issue page: /issues/019dcacf-83be-7de1-b972-d62757b3d5ef. Issue JSON: /v1/issues/019dcacf-83be-7de1-b972-d62757b3d5ef

sshd-auth is stuck in a likely timer churn loop: 100.00% of sampled CPU passed through intel_iommu_map_pages, with repeated thread backtraces show 1 thread(s) around 0x00007f4ff3a9a7d2 in ?? () from target:<path>.

## 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): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `openssh` 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. 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. 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.

Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `openssh` 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. 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 `openssh` 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): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, 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 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
`sshd-auth` was sampled sleeping around `clock_nanosleep()` after reads during preauth/userauth handling. The source maps this most plausibly to `auth2.c` failure-delay logic, but the evidence also reports only `0.2%` CPU and `S (sleeping)`, so it does not demonstrate a runaway CPU bug.

## Evidence Confidence
inferred

## Proposed Subject
No patch: diagnose `sshd-auth` auth-failure delay evidence before changing upstream OpenSSH timing code

## Patch Plan
Do not edit files from this evidence alone. First collect stronger evidence that `auth2.c:ensure_minimum_time_since()` is causing harmful repeated long sleeps rather than expected failed-auth throttling.

Relevant local conventions/helpers found: `monotime_double()`/`monotime_ts()` from `misc.c`, allocation helpers `xmalloc()` and `freezero()`, digest helper `ssh_digest_memory()`, logging via `debug*_f()`/`fatal_f()`, and monitor IPC through `monitor.c`/`monitor_wrap.c`. `README.md` and `regress/README.regress` identify the upstream build/test flow. No relevant prior Fixer patch was found beyond the baseline commit.

If later evidence confirms a real bug, prefer a small bounded change in `auth2.c` rather than awkward control flow: adjust `ensure_minimum_time_since()` so slow failed-auth attempts do not add multi-second padding unexpectedly, while preserving the minimum-delay intent and OpenSSH style.

## Risks
Authentication timing code is security-sensitive; reducing or reshaping delay may reintroduce username or auth-method timing leaks.

The collected evidence is profiler/strace-only and unsymbolized. It shows sleep and IPC activity, not sustained CPU burn.

Debian carries downstream patches, but this should be treated as an upstream OpenSSH change only if independently justified.

## Validation
Before any focused check, try the project entrypoint from the workspace root: `./configure && make`.

If that fails due to missing dependencies or generated files, record the exact failing command and reason, then run the narrowest reproducible build target such as `make sshd-auth`.

Bounded independent signal check: after building, run a local regression/smoke attempt around failed auth, for example `make tests LTESTS=connect-privsep` and, if safe dependencies are present, trace `sshd-auth` during a failed auth attempt to see whether long `clock_nanosleep` calls are reproducible. Do not claim reproduction unless that trace actually shows the failure signal.

## Patch Pass

Subject: no patch: diagnose sshd-auth sleep evidence

## Commit Message
No source change is included. The collected signal shows `sshd-auth` sleeping in `clock_nanosleep()` after monitor/socket reads, not burning CPU in a tight loop. The likely code path is OpenSSH's failed-authentication timing padding in `auth2.c`, but the evidence is unsymbolized and indirect, so a timing change would be speculative and security-sensitive.

## Evidence Confidence
inferred

## Issue Connection
The collected signal is a Fixer perf/strace/proc snapshot of `/usr/lib/openssh/sshd-auth`: state `S (sleeping)`, total CPU about `0.2%`, repeated `read` calls, and two long `clock_nanosleep()` calls. The cautious code-level inference is that the process is in failed user authentication timing padding, where `auth2.c:ensure_minimum_time_since()` uses OpenSSH helpers like `monotime_double()`, `ssh_digest_memory()`, `xmalloc()`, `freezero()`, and `debug3_f()` around a `nanosleep()` delay.

I did not make a source change. The saved plan said not to patch from this profiler-only evidence alone, and the code review did not prove that plan wrong. A source patch here would risk changing authentication timing behavior without a reproduced or symbolized failure.

The expected effect is no behavioral change: this leaves the tree ready for a stronger upstream report asking for a symbolized `sshd-auth` backtrace or a reproducer that proves the sleep is harmful rather than intended authentication throttling. Relevant style/convention docs checked: `README.md` and `regress/README.regress`; no `CONTRIBUTING`, `HACKING`, `README-hacking`, `docs/`, or `dev-docs/` files were present.

## Git Add Paths
None

## Validation
`./configure && make` failed from the workspace root before build:
`configure: error: ./configure.ac newer than configure, run autoreconf`

Focused fallback `make sshd-auth` also failed because configure had not produced generated files:
`includes.h:19:10: fatal error: config.h: No such file or directory`

Bounded reproduction attempt:
`timeout 5 strace -f -e trace=read,write,nanosleep,clock_nanosleep ./sshd-auth -h`

It did not reproduce the signal. It was blocked because tracing is not permitted in this environment and the workspace binary was not built:
`PTRACE_TRACEME: Operation not permitted`
`Cannot stat './sshd-auth': No such file or directory`

The raw artifact directory named in `evidence.json` was also absent in this container, so I could only use the embedded evidence excerpts.

## Review Pass 1

RESULT: ok

No source changes are present, and the response correctly treats the evidence as `inferred` rather than leaving a speculative OpenSSH timing patch. The author checked the relevant style docs, identified local helpers in the auth timing path, reported the workspace-root build failure with the exact blocker, attempted a focused fallback and bounded reproduction, and did not claim reproduction.

## Plan Pass

## Problem
`sshd-auth` was sampled sleeping around `clock_nanosleep()` after reads during preauth/userauth handling. The source maps this most plausibly to `auth2.c` failure-delay logic, but the evidence also reports only `0.2%` CPU and `S (sleeping)`, so it does not demonstrate a runaway CPU bug.

## Evidence Confidence
inferred

## Proposed Subject
No patch: diagnose `sshd-auth` auth-failure delay evidence before changing upstream OpenSSH timing code

## Patch Plan
Do not edit files from this evidence alone. First collect stronger evidence that `auth2.c:ensure_minimum_time_since()` is causing harmful repeated long sleeps rather than expected failed-auth throttling.

Relevant local conventions/helpers found: `monotime_double()`/`monotime_ts()` from `misc.c`, allocation helpers `xmalloc()` and `freezero()`, digest helper `ssh_digest_memory()`, logging via `debug*_f()`/`fatal_f()`, and monitor IPC through `monitor.c`/`monitor_wrap.c`. `README.md` and `regress/README.regress` identify the upstream build/test flow. No relevant prior Fixer patch was found beyond the baseline commit.

If later evidence confirms a real bug, prefer a small bounded change in `auth2.c` rather than awkward control flow: adjust `ensure_minimum_time_since()` so slow failed-auth attempts do not add multi-second padding unexpectedly, while preserving the minimum-delay intent and OpenSSH style.

## Risks
Authentication timing code is security-sensitive; reducing or reshaping delay may reintroduce username or auth-method timing leaks.

The collected evidence is profiler/strace-only and unsymbolized. It shows sleep and IPC activity, not sustained CPU burn.

Debian carries downstream patches, but this should be treated as an upstream OpenSSH change only if independently justified.

## Validation
Before any focused check, try the project entrypoint from the workspace root: `./configure && make`.

If that fails due to missing dependencies or generated files, record the exact failing command and reason, then run the narrowest reproducible build target such as `make sshd-auth`.

Bounded independent signal check: after building, run a local regression/smoke attempt around failed auth, for example `make tests LTESTS=connect-privsep` and, if safe dependencies are present, trace `sshd-auth` during a failed auth attempt to see whether long `clock_nanosleep` calls are reproducible. Do not

[truncated]

Issue page: /issues/019e1618-a319-7110-8975-2781a193d675. Issue JSON: /v1/issues/019e1618-a319-7110-8975-2781a193d675

sshd-session is stuck in a likely unclassified userspace loop: 100.00% of sampled CPU passed through tcp_rbtree_insert, with repeated thread backtraces show 1 thread(s) around 0x00007f145209a7d2 in ?? () from target:<path>.

## 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): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `openssh` 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. 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. 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.

Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `openssh` 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. 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 `openssh` 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): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, 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 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
The evidence does not currently identify an OpenSSH source bug. Fixer sampled `/usr/lib/openssh/sshd-session` and reported “runaway CPU”, but the same bundle shows `process_state: S (sleeping)`, `wchan: poll_schedule_timeout.constprop.0`, one `restart_syscall` over 5 seconds of `strace`, and only `0.1%` total CPU across 8 processes. The hot symbol is kernel-side `tcp_rbtree_insert`, and the implicated package is `linux-image-6.17.10+deb14-amd64`, not `openssh-server`.

## Evidence Confidence
inferred

## Proposed Subject
No OpenSSH source patch yet: diagnose the report as insufficient for an upstream-ready `sshd-session` change, unless a bounded reproduction or symbolized trace shows a user-space busy loop in OpenSSH.

## Patch Plan
Do not edit files on the current evidence. The relevant entrypoint is `sshd-session.c:main`, which hands authenticated sessions into `do_authenticated()` and then the server event loop. Nearby wait paths use `serverloop.c:wait_until_can_do_something()` with `ppoll()` and `misc.c`’s `ptimeout_*` helpers; the privileged monitor path uses `monitor.c:monitor_read()` with `poll()`.

If additional evidence shows a real OpenSSH loop, patch only that bounded loop and follow local conventions: `ptimeout_*` for poll deadlines, `atomicio` for full fd reads/writes, `sshbuf` for serialized protocol buffers, `xmalloc`/`xcalloc`/`xrecallocarray` for allocation, and `fatal_f`/`error_f`/`debug_f` for logging. Avoid awkward control flow such as adding a `goto` around the poll loop; prefer a small bounded condition or helper consistent with the existing loops.

No prior Fixer patch is present in the workspace (`git status --short` is clean), so there is nothing to replace.

## Risks
Adding a timeout or kill condition to `sshd-session` based only on this bundle could terminate legitimate idle SSH sessions or mask a kernel/network issue. The captured evidence is consistent with a normal process sleeping in `poll()` after an interrupted syscall, not a confirmed user-space spin.

## Validation
Before any focused check, try the project-level entrypoint from the workspace root: `./configure && make`.

For a bounded independent reproduction attempt, build with symbols if possible, run a temporary high-port `sshd` using generated host keys and a minimal config, make one local SSH connection attempt, then sample any `sshd-session` child for a few seconds with `ps`, `strace -tt -p <pid>`, and `gdb bt`/`pstack` if available. Only claim `reproduced` if that shows sustained CPU use or repeated user-space frames in OpenSSH; otherwise report that Fixer observed the signal but it was not independently reproduced.

## Patch Pass

Subject: openssh: do not patch ambiguous sshd-session poll sample

## Commit Message
No source change is proposed. The likely root cause is not an OpenSSH user-space busy loop: the collected `sshd-session` sample is sleeping in `poll`/`restart_syscall`, while the only hot symbol is kernel-side TCP code.

## Evidence Confidence
inferred

## Issue Connection
Fixer collected a profiler signal for `/usr/lib/openssh/sshd-session` and labelled it as runaway CPU, but the supporting `/proc`, `strace`, and stack evidence does not show a runnable OpenSSH loop. The process state was `S (sleeping)`, `wchan` was `poll_schedule_timeout.constprop.0`, `strace` captured only a resumed `restart_syscall`, and the reported hot symbol was `tcp_rbtree_insert` in the kernel.

The cautious code-level inference is that this is an interrupted or sleeping `poll(2)` wait, not an identified bug in `sshd-session`. I followed the saved plan and did not change course: no source diff is left because the evidence remains indirect and is not pull-request-ready for an upstream OpenSSH patch.

I inspected the relevant paths anyway. `sshd-session.c:main` enters the session process, `monitor.c:monitor_read()` blocks in `poll()`, and `serverloop.c:wait_until_can_do_something()` blocks in `ppoll()` using the local `ptimeout_*` helpers from `misc.c`. Nearby conventions also use `atomicio`, `sshbuf`, `xmalloc`/`xcalloc`, and `fatal_f`/`error_f`/`debug_f`. `README.md` is the only contribution/build-style document found among the requested names; it documents the autoconf/make build. No source change was made, so there is no expected code effect beyond avoiding an unsafe timeout or kill-path change that could break legitimate idle SSH sessions.

## Git Add Paths
None

## Validation
Ran the requested workspace-root entrypoint:

`./configure && make`

It failed before compilation with:

`configure: error: ./configure.ac newer than configure, run autoreconf`

No top-level `Makefile` or `config.h` existed afterward, so there was no clean focused compile target such as `make sshd-session` available. I did not run `autoreconf` because this no-patch diagnosis should not rewrite generated files in the proposal tree.

Bounded reproduction attempt:

`ps -C sshd-session -o pid,ppid,stat,pcpu,comm,args`

Result: no live `sshd-session` process was visible in the sandbox to attach `strace`/`gdb` to. The raw investigation directory named in `evidence.json` was also unavailable: `No such file or directory`. A simple installed binary smoke check, `timeout 2 /usr/lib/openssh/sshd-session -V`, returned `OpenSSH_10.3p1 Debian-2, OpenSSL 3.6.2 7 Apr 2026` and did not reproduce the reported CPU signal.

Final workspace check: `git status --short` showed no source changes.

## Review Pass 1

RESULT: ok

The first pass is a no-patch diagnosis, and that is appropriate for the evidence level. The workspace has no source diff, `## Evidence Confidence` is exactly `inferred`, and the explanation does not overclaim a confirmed OpenSSH bug.

The author correctly connects the evidence to the decision: the sampled process is sleeping in `poll`/`restart_syscall`, CPU attribution points at kernel `tcp_rbtree_insert`, and the reported OpenSSH-side frames are unsymbolized. They also named the relevant local conventions and helpers (`ptimeout_*`, `atomicio`, `sshbuf`, `xmalloc`/`xcalloc`, `fatal_f`/`error_f`/`debug_f`) and avoided inventing a reproducer or applying a speculative timeout/kill-path patch.

Validation is acceptable for a no-change diagnosis: the project-level `./configure && make` was attempted and failed with the exact generated-file blocker, and the author recorded a bounded reproduction attempt that could not find a live `sshd-session` process to sample.

## Plan Pass

## Problem
The evidence does not currently identify an OpenSSH source bug. Fixer sampled `/usr/lib/openssh/sshd-session` and reported “runaway CPU”, but the same bundle shows `process_state: S (sleeping)`, `wchan: poll_schedule_timeout.constprop.0`, one `restart_syscall` over 5 seconds of `strace`, and only `0.1%` total CPU across 8 processes. The hot symbol is kernel-side `tcp_rbtree_insert`, and the implicated package is `linux-image-6.17.10+deb14-amd64`, not `openssh-server`.

## Evidence Confidence
inferred

## Proposed Subject
No OpenSSH source patch yet: diagnose the report as insufficient for an upstream-ready `sshd-session` change, unless a bounded reproduction or symbolized trace shows a user-space busy loop in OpenSSH.

## Patch Plan
Do not edit files on the current evidence. The relevant entrypoint is `sshd-session.c:main`, which hands authenticated sessions into `do_authenticated()` and then the server event loop. Nearby wait paths use `serverloop.c:wait_until_can_do_something()` with `ppoll()` and `misc.c`’s `ptimeout_*` helpers; the privileged monitor path uses `monitor.c:monitor_read()` with `poll()`.

If additional evidence shows a real OpenSSH loop, patch only that bounded loop and follow local conventions: `ptimeout_*` for poll deadlines, `atomicio` for full fd reads/writes, `sshbuf` for serialized protocol buffers, `xmalloc`/`xcalloc`/`xrecallocarray` for allocation, and `fatal_f`/`error_f`/`debug_f` for logging. Avoid awkward control flow such as adding a `goto` around the poll loop; prefer a small bounded condition or helper consistent with the existing loops.

No prior Fixer patch is present in the workspace (`git status --short` is clean), so there is nothing to replace.

## Risks
Adding a timeout or kill condition to `sshd-session` based only on this bundle could terminate legitimate idle SSH sessions or mask a kernel/network issue. The captured evidence is consistent with a normal process sleeping in `poll()` after an interrupted syscall, not a confirmed user-space spin.

## Validation
Before any focused check, try the project-level entrypoint from the workspace root: `./configure && make`.

For a bounded independent reproduction attempt, build with symbols if possible, run a temporary high-port `sshd` using generated host keys and a minimal config, make one local SSH connection attempt, then sample any `sshd-sess

[truncated]

Issue page: /issues/019dff6d-034b-79e2-beb1-af05323faee8. Issue JSON: /v1/issues/019dff6d-034b-79e2-beb1-af05323faee8

python3.13 is stuck in a likely busy poll loop: 6.41% of sampled CPU passed through unresolved offset, with repeated thread backtraces show 1 thread(s) around 0x00007fdd05c9b72e in ?? () and 1 thread(s) around 0x00007fdd05c9b72e in ?? ().

## 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): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `python3.13` 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. 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. 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.

Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `python3.13` 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. 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 (local metadata check)

Local metadata consistency check

## Refinement Pass 1

You are refining a fixer patch after an explicit code review.

Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. Read the latest author response at `./patch-output.txt`. Read the review report at `./review-1-output.txt`. This is refinement round 1. The original pre-edit snapshot is available at `./source` if you need to compare the current patch against it. Re-read the planning pass at `./plan-output.txt` before editing. The workspace currently changes these repo-relative paths: Lib/__pycache__/__future__.cpython-313.pyc, Lib/__pycache__/_collections_abc.cpython-313.pyc, Lib/__pycache__/_colorize.cpython-313.pyc, Lib/__pycache__/_compat_pickle.cpython-313.pyc, Lib/__pycache__/_compression.cpython-313.pyc, Lib/__pycache__/_opcode_metadata.cpython-313.pyc, Lib/__pycache__/_sitebuiltins.cpython-313.pyc, Lib/__pycache__/_weakrefset.cpython-313.pyc, Lib/__pycache__/abc.cpython-313.pyc, Lib/__pycache__/argparse.cpython-313.pyc, Lib/__pycache__/ast.cpython-313.pyc, Lib/__pycache__/base64.cpython-313.pyc, Lib/__pycache__/bz2.cpython-313.pyc, Lib/__pycache__/codecs.cpython-313.pyc, Lib/__pycache__/contextlib.cpython-313.pyc, Lib/__pycache__/contextvars.cpython-313.pyc, Lib/__pycache__/copy.cpython-313.pyc, Lib/__pycache__/copyreg.cpython-313.pyc, Lib/__pycache__/datetime.cpython-313.pyc, Lib/__pycache__/dis.cpython-313.pyc, Lib/__pycache__/enum.cpython-313.pyc, Lib/__pycache__/fnmatch.cpython-313.pyc, Lib/__pycache__/functools.cpython-313.pyc, Lib/__pycache__/genericpath.cpython-313.pyc, Lib/__pycache__/gettext.cpython-313.pyc, Lib/__pycache__/glob.cpython-313.pyc, Lib/__pycache__/heapq.cpython-313.pyc, Lib/__pycache__/inspect.cpython-313.pyc, Lib/__pycache__/io.cpython-313.pyc, Lib/__pycache__/keyword.cpython-313.pyc, Lib/__pycache__/linecache.cpython-313.pyc, Lib/__pycache__/locale.cpython-313.pyc, Lib/__pycache__/lzma.cpython-313.pyc, Lib/__pycache__/numbers.cpython-313.pyc, Lib/__pycache__/opcode.cpython-313.pyc, Lib/__pycache__/operator.cpython-313.pyc, Lib/__pycache__/os.cpython-313.pyc, Lib/__pycache__/posixpath.cpython-313.pyc, Lib/__pycache__/reprlib.cpython-313.pyc, Lib/__pycache__/selectors.cpython-313.pyc, Lib/__pycache__/shutil.cpython-313.pyc, Lib/__pycache__/signal.cpython-313.pyc, Lib/__pycache__/site.cpython-313.pyc, Lib/__pycache__/socket.cpython-313.pyc, Lib/__pycache__/ssl.cpython-313.pyc, Lib/__pycache__/stat.cpython-313.pyc, Lib/__pycache__/string.cpython-313.pyc, Lib/__pycache__/struct.cpython-313.pyc, Lib/__pycache__/subprocess.cpython-313.pyc, Lib/__pycache__/textwrap.cpython-313.pyc, Lib/__pycache__/threading.cpython-313.pyc, Lib/__pycache__/token.cpython-313.pyc, Lib/__pycache__/tokenize.cpython-313.pyc, Lib/__pycache__/traceback.cpython-313.pyc, Lib/__pycache__/types.cpython-313.pyc, Lib/__pycache__/typing.cpython-313.pyc, Lib/__pycache__/warnings.cpython-313.pyc, Lib/__pycache__/weakref.cpython-313.pyc, Lib/asyncio/__pycache__/__init__.cpython-313.pyc, Lib/asyncio/__pycache__/base_events.cpython-313.pyc, Lib/asyncio/__pycache__/base_futures.cpython-313.pyc, Lib/asyncio/__pycache__/base_subprocess.cpython-313.pyc, Lib/asyncio/__pycache__/base_tasks.cpython-313.pyc, Lib/asyncio/__pycache__/constants.cpython-313.pyc, Lib/asyncio/__pycache__/coroutines.cpython-313.pyc, Lib/asyncio/__pycache__/events.cpython-313.pyc, Lib/asyncio/__pycache__/exceptions.cpython-313.pyc, 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[truncated 27774 bytes]

## Plan Pass

## Problem
Fixer observed `/usr/bin/python3 /usr/bin/supervisord -n -c /etc/supervisor/supervisord.conf` cycling through `wait4(-1, ..., WNOHANG) = -1 ECHILD` and `poll(..., 1000) = 0`. The captured process is sleeping in `poll_schedule_timeout`, and the one-second timeout pattern looks like supervisord’s application event loop, not a confirmed CPython busy loop.

## Evidence Confidence
inferred

## Proposed Subject
No CPython source patch yet: report this as an application-level polling diagnosis unless extra evidence isolates a CPython runtime or stdlib defect.

## Patch Plan
Do not edit files in this pass. The evidence does not identify a CPython bug: `poll(..., 1000)` blocks for about one second, `wait4(..., WNOHANG)` returns quickly with `ECHILD`, and the command line points to `supervisord`.

Before any future patch, collect isolating evidence that the same runaway CPU is caused by CPython itself, for example a small script that triggers high CPU through `Lib/subprocess.py`, `Lib/selectors.py`, `Modules/selectmodule.c`, or `Modules/posixmodule.c` without supervisord. If that evidence appears, follow CPython conventions from `README.rst` and the devguide, and use local helpers already present in the subsystem: `_PyTime_*` deadline conversion, `Py_BEGIN_ALLOW_THREADS`, `PyErr_SetFromErrno`, and the existing `subprocess.Popen._waitpid_lock` pattern. Avoid awkward control flow such as adding `goto` where the existing bounded loops and early returns are cleaner.

No prior Fixer patch appears to need replacement; the tree only shows the `Fixer baseline` commit and Debian’s existing unrelated patch series.

## Risks
A CPython patch based only on this evidence would likely paper over supervisord behavior or change correct `poll`/`waitpid` semantics. Changing `subprocess` or `select` timeout behavior without a reproducer risks regressions in event loops and process management.

## Validation
If later evidence justifies a CPython patch, first try the project-level entrypoint from the workspace root: `./configure && make`. If dependencies or generated files are missing, record the exact failing command and reason, then run the narrowest relevant check such as `./python -m test test_selectors test_subprocess` or a focused compile of the touched C module.

For bounded independent evidence collection before editing, run a small local Python script that mimics `wait4(-1, WNOHANG)` plus one-second `poll`/selector waits and measure whether it actually consumes CPU. Do not claim `reproduced` unless that command shows the failure signal independently.

## Patch Pass

Subject: No patch: diagnose supervisord wait/poll trace as application loop

## Commit Message
No source change. The collected trace shows a Python application loop in `supervisord`, not an isolated CPython runtime defect. A CPython patch would be speculative without a reproducer that points at `select`, `os.wait4`, or `subprocess` behavior independent of the application.

## Evidence Confidence
inferred

## Issue Connection
Fixer collected perf, strace, and `/proc` evidence for `/usr/bin/python3 /usr/bin/supervisord -n -c /etc/supervisor/supervisord.conf`. The exact signal was repeated `wait4(-1, ..., WNOHANG) = -1 ECHILD` followed by `poll(..., 1000) = 0`, while `/proc` showed the process in sleeping state with `wchan` at `poll_schedule_timeout`.

The likely root cause is supervisord’s event loop waking once per second to check for children and then blocking in `poll()`. The `poll()` calls in the evidence block for about one second, so the trace does not show a tight CPython busy loop. Nearby CPython code already uses the expected local patterns: `_PyTime_*` timeout conversion and `Py_BEGIN_ALLOW_THREADS` around `poll()` in `Modules/selectmodule.c`, `posix_error()` handling around `wait4()` in `Modules/posixmodule.c`, and `_waitpid_lock` in `Lib/subprocess.py`.

I followed the saved plan and did not make a source change. The expected effect is no patch churn in CPython until stronger evidence identifies a runtime or standard-library bug.

## Git Add Paths
None

## Validation
Checked contribution/style entry points: no `CONTRIBUTING`, `HACKING`, or `README-hacking` file was present at the searched depth; `README.rst` points CPython contributors to the Developer Guide and documents `./configure`, `make`, and `make test`.

Ran project-level validation from the workspace root:

`./configure && make`

Result: passed. The build reported optional modules `_dbm`, `_gdbm`, and `_tkinter` missing, but built the interpreter and relevant `select`/`posix` modules.

Ran bounded independent syscall-pattern smoke check with the built interpreter:

`./python - <<'PY' ... os.wait4(-1, os.WNOHANG) plus select.poll().poll(1000) for 5 loops ... PY`

Result: `echild=5 poll_timeouts=5 wall=5.004s cpu=0.000255s`. This did not reproduce high CPU; it reproduced the wait/poll shape as a sleeping one-second loop.

## Review Pass 1 (local metadata check)

RESULT: fix-needed

## Findings
1. Patch metadata drift: the workspace currently changes `Lib/__pycache__/__future__.cpython-313.pyc`, `Lib/__pycache__/_collections_abc.cpython-313.pyc`, `Lib/__pycache__/_colorize.cpython-313.pyc`, `Lib/__pycache__/_compat_pickle.cpython-313.pyc`, `Lib/__pycache__/_compression.cpython-313.pyc`, `Lib/__pycache__/_opcode_metadata.cpython-313.pyc`, `Lib/__pycache__/_sitebuiltins.cpython-313.pyc`, `Lib/__pycache__/_weakrefset.cpython-313.pyc`, `Lib/__pycache__/abc.cpython-313.pyc`, `Lib/__pycache__/argparse.cpython-313.pyc`, `Lib/__pycache__/ast.cpython-313.pyc`, `Lib/__pycache__/base64.cpython-313.pyc`, `Lib/__pycache__/bz2.cpython-313.pyc`, `Lib/__pycache__/codecs.cpython-313.pyc`, `Lib/__pycache__/contextlib.cpython-313.pyc`, `Lib/__pycache__/contextvars.cpython-313.pyc`, `Lib/__pycache__/copy.cpython-313.pyc`, `Lib/__pycache__/copyreg.cpython-313.pyc`, `Lib/__pycache__/datetime.cpython-313.pyc`, `Lib/__pycache__/dis.cpython-313.pyc`, `Lib/__pycache__/enum.cpython-313.pyc`, 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Update `## Git Add Paths` to match the real shipped file set exactly, and make sure `## Issue Connection` explains every functional file that remains in the patch.
2. Missing from `## Git Add Paths`: `Lib/__pycache__/__future__.cpython-313.pyc`, `Lib/__pycache__/_collections_abc.cpython-313.pyc`, `Lib/__pycache__/_colorize.cpython-313.pyc`, `Lib/__pycache__/_compat_pickle.cpython-313.pyc`, `Lib/__pycache__/_compression.cpython-313.pyc`, `Lib/__pycache__/_opcode_metadata.cpython-313.pyc`, `Lib/__pycache__/_sitebuiltins.cpython-313.pyc`, `Lib/__pycache__/_weakrefset.cpython-313.pyc`, `Lib/__pycache__/abc.cpython-313.pyc`, `Lib/__pycache__/argparse.cpython-313.pyc`, `Lib/__pycache__/ast.cpython-313.pyc`, `Lib/__pycache__/base64.cpython-313.pyc`, `Lib/__pycache__/bz2.cpython-313.pyc`, `Lib/__pycache__/codecs.cpython-313.pyc`, `Lib/__pycache__/contextlib.cpython-313.pyc`, `Lib/__pycache__/contextvars.cpython-313.pyc`, `Lib/__pycache__/copy.cpython-313.pyc`, `Lib/__pycache__/copyreg.cpython-313.pyc`, `Lib/__pycache__/datetime.cpython-313.pyc`, `Lib/__pycache__/dis.cpython-313.pyc`, `Lib/__pycache__/enum.cpython-313.pyc`, 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2. Listed in `## Git Add Paths` but not actually changed: `None`.

## Refinement Pass 1

Subject: No patch: keep supervisord wait/poll diagnosis source-clean

## Commit Message
No source change. The review found generated build artifacts left in the worktree after validation, so I removed them and kept the proposal as a no-patch CPython diagnosis.

## Evidence Confidence
inferred

## Issue Connection
Fixer observed `/usr/bin/python3 /usr/bin/supervisord -n -c /etc/supervisor/supervisord.conf` repeating `wait4(-1, ..., WNOHANG) = -1 ECHILD` followed by `poll(..., 1000) = 0`. `/proc` showed the process sleeping in `poll_schedule_timeout`, and the `poll()` calls in the trace block for about one second.

The cautious inference remains that this is supervisord’s application event loop periodically checking for child processes, not a proven CPython runtime bug. CPython’s nearby code already follows local patterns: `_PyTime_*` timeout handling and `Py_BEGIN_ALLOW_THREADS` around `poll()`, `posix_error()` for `wait4()`, and `Popen._waitpid_lock` in `subprocess`.

I made no source changes. In this refinement I addressed the review finding by removing generated build artifacts so `## Git Add Paths` and the actual worktree both represent a no-patch diagnosis. The expected effect is a clean, upstreamable report with no accidental build outputs.

## Git Add Paths
None

## Validation
Reviewed the required inputs again: `plan-output.txt`, `patch-output.txt`, `review-1-output.txt`, and `evidence.json`.

Addressed review finding:
`make distclean`
Result: removed generated build outputs and bytecode from the prior validation build.

Checked final patch state:
`git status --short`
Result: clean worktree.

I did not rerun `./configure && make` after cleanup because there is still no source diff and rerunning it would recreate the generated artifacts that the review asked to remove. The previous authoring pass did run `./configure && make` successfully, with only optional `_dbm`, `_gdbm`, and `_tkinter` reported missing, and also ran the bounded wait/poll smoke check, which showed `wall=5.004s cpu=0.000255s` rather than reproducing high CPU.

## Review Pass 2

RESULT: ok

The current worktree is clean (`git status --short` and `git diff --stat` are empty), so the latest `## Git Add Paths` value of `None` is now synchronized with the actual patch state.

The no-patch diagnosis is consistent with the evidence confidence: `inferred` is appropriate for profiler/strace evidence that does not isolate a CPython defect, and the response does not invent a reproducer or overstate the trace as a confirmed runtime bug. The validation explanation is acceptable for this refinement round because the prior project-level `./configure && make` run was reported, the generated artifacts were removed with `make distclean`, and rerunning the build would recreate the exact metadata drift the review asked to fix.

## Plan Pass

## Problem
Fixer observed `/usr/bin/python3 /usr/bin/supervisord -n -c /etc/supervisor/supervisord.conf` cycling through `wait4(-1, ..., WNOHANG) = -1 ECHILD` and `poll(..., 1000) = 0`. The captured process is sleeping in `poll_schedule_timeout`, and the one-second timeout pattern looks like supervisord’s application event loop, not a confirmed CPython busy loop.

## Evidence Confidence
inferred

## Proposed Subject
No CPython source patch yet: report this as an application-level polling diagnosis unless extra evidence isolates a CPython runtime or stdlib defect.

## Patch Plan
Do not edit files in this pass. The evidence does not identify a CPython bug: `poll(..., 1000)` blocks for about one second, `wait4(..., WNOHANG)` returns quickly with `ECHILD`, and the command line points to `supervisord`.

Before any future patch, collect isolating evidence that the same runaway CPU is caused by CPython itself, for example a small script that triggers high CPU through `Lib/subprocess.py`, `Lib/selectors.py`, `Modules/selectmodule.c`, or `Modules/posixmodule.c` without supervisord. If that evidence appears, follow CPython conventions from `README.rst` and the devguide, and use local helpers already present in the subsystem: `_PyTime_*` deadline conversion, `Py_BEGIN_ALLOW_THREADS`, `PyErr_SetFromErrno`, and the existing `subprocess.Popen._waitpid_lock` pattern. Avoid awkward control flow such as adding `goto` where the existing bounded loops and early returns are cleaner.

No prior Fixer patch appears to need replacement; the tree only shows the `Fixer baseline` commit and Debian’s existing unrelated patch series.

## Risks
A CPython patch based only on this evidence would likely paper over supervisord behavior or change correct `poll`/`waitpid` semantics. Changing `subprocess` or `select` timeout behavior without a reproducer risks regressions in event loops and process management.

## Validation
If later evidence justifies a CPython patch, first try the project-level entrypoint from the workspace root: `./configure && make`. If dependencies or generated files are missing, record the exact failing command and reason, then run the narrowest relevant check such as `./python -m test test_selectors test_subprocess` or a focused compile of the touched C module.

For bounded independent evidence collection before editing, run a small local Python script 

[truncated]

Issue page: /issues/019d7cef-46dd-7541-b939-9ba6872fbf76. Issue JSON: /v1/issues/019d7cef-46dd-7541-b939-9ba6872fbf76

sshd-session is stuck in a likely unclassified userspace loop: 50.00% of sampled CPU passed through _raw_spin_lock_irqsave, with repeated thread backtraces show 1 thread(s) around 0x00007f7e7ce9a7d2 in ?? () from target:<path>.

## 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): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `openssh` 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. 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. 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.

Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `openssh` 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. 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 `openssh` 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): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, 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 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 an `sshd-session: gis [priv]` process classified as a possible runaway loop, but the captured process was sleeping in `poll_schedule_timeout`/`restart_syscall`, with only one `strace` line over 5 seconds and total sampled `sshd-session` CPU at 0.5%. The hottest symbols are kernel-side (`_raw_spin_lock_irqsave`, `i40e_lan_xmit_frame`), not resolved OpenSSH userspace frames.

## Evidence Confidence
inferred

## Proposed Subject
No OpenSSH source patch yet: diagnose/report insufficient userspace-loop evidence for `sshd-session` poll wait.

## Patch Plan
Do not edit source in this pass. The available evidence does not identify a confirmed OpenSSH busy loop, and a source patch would be speculative.

Before any later patch, collect extra evidence that can connect the sampled addresses to source lines and show repeated userspace progress without blocking. Specifically, rebuild with symbols, map the reported PIE offsets (`0x35f15`, `0x38264`, `0x10d0e`) via `addr2line`, and attempt a bounded local `sshd` session reproduction with `strace`/`perf` sampling.

If that later evidence points at the session event loop, follow the existing OpenSSH conventions in `serverloop.c`: use `ptimeout_*()` timeout helpers, `channel_prepare_poll()`/`channel_after_poll()`, `ssh_signal()`, `xrecallocarray()`, and `debug_f`/`fatal_f` logging style. Keep control flow straight-line where possible and avoid adding unnecessary `goto`.

No prior Fixer patch is present in this workspace; `git status --short` and `git diff --stat` were clean.

## Risks
A patch based only on the current bundle could mask normal idle `ppoll()` behavior or disturb SSH session wakeup semantics. The evidence also implicates the runtime/kernel/network path more strongly than OpenSSH application code.

The project guidance found in `README` asks contributors to follow OpenBSD style. No separate `CONTRIBUTING`/`HACKING` file was found; `README.md` documents the standard `./configure`, `make`, and `make tests` workflow.

## Validation
If extra evidence justifies a patch, first run the project-level entrypoint from the workspace root:

```sh
./configure && make
```

If that fails due to missing dependencies or generated files, record the exact command and failure, then run the narrowest reproducible build such as:

```sh
make sshd-session
```

For the bounded independent reproduction attempt, start a temporary local `sshd`/`sshd-session` flow from the built tree, connect once over localhost, and sample the session process with `timeout 5s strace -p <pid>` plus a short `perf`/`ps` check. Do not claim reproduction unless that command shows repeated userspace activity rather than an idle `ppoll()` wait.

## Patch Pass

Subject: no patch: sshd-session sample lacks userspace loop evidence

## Commit Message
No source change is proposed. The collected signal shows an `sshd-session` process sleeping in `poll()`/`restart_syscall`, with low aggregate CPU and kernel/network hot symbols, so there is not enough evidence to make an upstream OpenSSH code change safely.

## Evidence Confidence
inferred

## Issue Connection
The likely root cause from the collected perf, strace, and `/proc` evidence is not an OpenSSH userspace busy loop. Fixer captured `sshd-session: gis [priv]` in state `S (sleeping)`, with kernel stack `poll_schedule_timeout`, one `restart_syscall(<... resuming interrupted poll ...>)` line over a 5-second strace, and total sampled `sshd-session` CPU of 0.5%. The hottest sampled symbols were `_raw_spin_lock_irqsave` and `i40e_lan_xmit_frame` in the kernel, which points more toward scheduler/network activity or normal interrupted polling than a tight loop in `sshd-session`.

I followed the saved plan and did not change course: without stronger evidence mapping the unresolved frames to OpenSSH source and showing repeated userspace progress, a source patch would be speculative. I inspected the relevant session event-loop code in `serverloop.c`; it already uses OpenSSH’s local polling and allocation conventions, including `ptimeout_*()` timeout helpers, `channel_prepare_poll()`/`channel_after_poll()`, `ssh_signal()`, `xrecallocarray()`, and `debug_f`/`fatal_f` style logging. `README` asks contributors to follow OpenBSD style; no separate `CONTRIBUTING`, `HACKING`, `README-hacking`, `docs/`, or `dev-docs/` guidance was found.

The expected effect of leaving no source diff is to avoid landing an upstream patch that changes SSH session wakeup behavior without a demonstrated OpenSSH bug. A useful upstream report would include symbolized backtraces or a reproducible trace showing `sshd-session` repeatedly cycling in userspace rather than sleeping in `ppoll()`/`poll()`.

## Git Add Paths
None

## Validation
`./configure && make` from the workspace root was attempted first and failed before compilation with:

```text
configure: error: ./configure.ac newer than configure, run autoreconf
```

To avoid generated-file churn in the proposal workspace, I copied the tree to `/tmp/openssh-89431-build.nVMLwP` and ran:

```sh
autoreconf
./configure
make sshd-session
```

That completed successfully and linked `sshd-session`.

Bounded independent reproduction was attempted with:

```sh
timeout 5s strace -f -e trace=poll,ppoll,restart_syscall ./sshd-session -D -e -f /dev/null
```

It was blocked by sandbox ptrace restrictions:

```text
strace: do_test_ptrace_get_syscall_info: PTRACE_TRACEME: Operation not permitted
strace: attach: ptrace(PTRACE_SEIZE, 56): Operation not permitted
```

A direct smoke command, `timeout 5s ./sshd-session -h`, only printed usage and did not reproduce the collected failure signal. The raw investigation artifact directory referenced by `evidence.json` was also not present in this workspace, so I could not map the original sampled frames beyond the embedded excerpts.

## Review Pass 1

RESULT: ok

The first pass is acceptable as a no-patch diagnosis. The workspace has no source diff, `## Evidence Confidence` is correctly set to `inferred`, and the explanation does not overclaim beyond the profiler/strace evidence.

It also satisfies the validation requirement: it attempted `./configure && make`, reported the exact blocker, then ran a focused reproducible build after `autoreconf` in a temp copy. The bounded reproduction attempt was reported as blocked by ptrace restrictions, so it correctly avoids claiming `reproduced`.

Style/helper review is adequate for a no-change result: it notes OpenBSD style guidance from `README`, absence of the requested contribution docs, and the relevant OpenSSH helpers in the session event loop.

## Plan Pass

## Problem
Fixer observed an `sshd-session: gis [priv]` process classified as a possible runaway loop, but the captured process was sleeping in `poll_schedule_timeout`/`restart_syscall`, with only one `strace` line over 5 seconds and total sampled `sshd-session` CPU at 0.5%. The hottest symbols are kernel-side (`_raw_spin_lock_irqsave`, `i40e_lan_xmit_frame`), not resolved OpenSSH userspace frames.

## Evidence Confidence
inferred

## Proposed Subject
No OpenSSH source patch yet: diagnose/report insufficient userspace-loop evidence for `sshd-session` poll wait.

## Patch Plan
Do not edit source in this pass. The available evidence does not identify a confirmed OpenSSH busy loop, and a source patch would be speculative.

Before any later patch, collect extra evidence that can connect the sampled addresses to source lines and show repeated userspace progress without blocking. Specifically, rebuild with symbols, map the reported PIE offsets (`0x35f15`, `0x38264`, `0x10d0e`) via `addr2line`, and attempt a bounded local `sshd` session reproduction with `strace`/`perf` sampling.

If that later evidence points at the session event loop, follow the existing OpenSSH conventions in `serverloop.c`: use `ptimeout_*()` timeout helpers, `channel_prepare_poll()`/`channel_after_poll()`, `ssh_signal()`, `xrecallocarray()`, and `debug_f`/`fatal_f` logging style. Keep control flow straight-line where possible and avoid adding unnecessary `goto`.

No prior Fixer patch is present in this workspace; `git status --short` and `git diff --stat` were clean.

## Risks
A patch based only on the current bundle could mask normal idle `ppoll()` behavior or disturb SSH session wakeup semantics. The evidence also implicates the runtime/kernel/network path more strongly than OpenSSH application code.

The project guidance found in `README` asks contributors to follow OpenBSD style. No separate `CONTRIBUTING`/`HACKING` file was found; `README.md` documents the standard `./configure`, `make`, and `make tests` workflow.

## Validation
If extra evidence justifies a patch, first run the project-level entrypoint from the workspace root:

```sh
./configure && make
```

If that fails due to missing dependencies or generated files, record the exact command and failure, then run the narrowest reproducible build such as:

```sh
make sshd-session
```

For the bounded independent reproducti

[truncated]

Issue page: /issues/019dfff8-b89b-7eb0-9cb2-19fa1832bb1a. Issue JSON: /v1/issues/019dfff8-b89b-7eb0-9cb2-19fa1832bb1a

sshd-session is stuck in a likely unclassified userspace loop: 50.00% of sampled CPU passed through css_rstat_updated, with repeated thread backtraces show 1 thread(s) around 0x00007f7e7ce9a7d2 in ?? () from target:<path>.

## 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): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `openssh` 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. 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. 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.

Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `openssh` 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. 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 `openssh` 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): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, 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 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 a runaway `sshd-session`, but the bundle does not identify an OpenSSH userspace spin. The sampled process is `S (sleeping)`, blocked in `poll_schedule_timeout`/`restart_syscall`, with one strace line over 5 seconds and kernel hot symbols (`css_rstat_updated`, `tcp_event_new_data_sent`). The OpenSSH server session loop already sleeps via `ppoll()` using local `ptimeout_*` helpers in `misc.c`.

## Evidence Confidence

inferred

## Proposed Subject

No source patch yet: diagnose `sshd-session` poll-wait profiler signal before editing.

## Patch Plan

Do not edit OpenSSH in this pass. The available evidence is profiler-only/indirect and does not show a source-level loop or a user-visible failure suitable for an upstream patch.

Before any later source patch, collect extra evidence that ties CPU use to a specific OpenSSH frame or event-loop condition: an unstripped backtrace, `perf top/report` with userspace symbols, repeated `strace -ttT -p`, and poll fd readiness state if reproducible locally.

If later evidence points at `serverloop.c`, follow the existing maintainer convention there: bounded straight-line checks in `wait_until_can_do_something()`, `fatal_f`/`error_f` for diagnostics, `monotime()` for time decisions, `ptimeout_*` for deadlines, and `ppoll()` with the saved signal mask. Avoid awkward control flow such as avoidable `goto`; this loop already has clean bounded branches.

No prior Fixer patch is present in the workspace (`git status --short` was clean), so there is no existing patch to improve or replace.

## Risks

A speculative patch here would likely misdiagnose normal sleeping `ppoll()` behavior as a busy loop. It could also disturb sensitive sshd session timing, keepalive, rekey, signal, or channel semantics without evidence that those paths are faulty.

The Debian package carries patches including GSSAPI and systemd socket activation, but the observed process is `sshd-session`, while the relevant systemd socket activation changes are mainly in the listener path. No relevant file IO, spawning, or locking helper issue was found; the relevant local helper is the OpenSSH `ptimeout_*` poll-timeout API.

## Validation

For any later patch, first run the project entrypoint from the workspace root:

```sh
./configure && make
```

If that fails due to missing dependencies or generated files, report the exact command and failure reason, then run the narrowest reproducible compile such as:

```sh
make serverloop.o sshd-session.o
```

Bounded independent reproduction attempt before claiming a fix: start a local debug `sshd`/`sshd-session` under the built tree with a temporary config and attach `strace -ttT -p` plus a short `perf record/report` sample to confirm whether the process is actually consuming CPU outside expected `ppoll()` sleep. Do not claim `reproduced` unless that command shows a repeatable userspace spin.

## Patch Pass

Subject: no patch: diagnose sshd-session poll-wait sample

## Commit Message
No source change was made. The collected data shows `sshd-session` sleeping in the kernel poll path, not a confirmed OpenSSH userspace loop. Without a symbolized OpenSSH frame, repeated syscall activity, or a local reproduction, a source patch would be speculative rather than upstream-ready.

## Evidence Confidence
inferred

## Issue Connection
The collected signal was a Fixer profiler sample for `/usr/lib/openssh/sshd-session`: the process state was `S (sleeping)`, the kernel wait channel was `poll_schedule_timeout`, strace captured only one resumed `restart_syscall` over 5 seconds, and the hot samples were kernel symbols (`css_rstat_updated` and `tcp_event_new_data_sent`). The reported total CPU for eight `sshd-session` processes was only 0.1%.

The cautious inference is that the sampled process was blocked in the normal poll wait path, not spinning in a proven OpenSSH event loop. The relevant OpenSSH server loop already uses the local `ptimeout_*` helpers, `monotime()`, `ppoll()`, and `fatal_f`/`error_f` conventions around `wait_until_can_do_something()`.

I made no source change because the saved plan required stronger evidence before editing, and the code inspection did not prove a narrow causal bug. The expected effect is to avoid sending an upstream patch that changes sshd session timing or signal behavior without evidence that those paths caused the collected sample.

I checked `README.md`; no `CONTRIBUTING`, `HACKING`, `README-hacking`, `docs/`, or `dev-docs/` guidance was present. No new APIs were introduced.

## Git Add Paths
None

## Validation
`./configure && make` from the workspace root failed before build:
`configure: error: ./configure.ac newer than configure, run autoreconf`

Focused compile from the unconfigured workspace also failed:
`make serverloop.o`
blocked by `includes.h:19:10: fatal error: config.h: No such file or directory`

To avoid modifying the proposal workspace, I copied the tree to `/tmp/openssh-fixer-89428-build-2` and ran:
`autoreconf -f -i` succeeded with sandbox stream-fd warnings and normal obsolete macro warnings.
`./configure` succeeded.
`make serverloop.o sshd-session.o` succeeded.

Independent reproduction attempt:
`ps -C sshd-session -o pid,stat,pcpu,wchan:32,cmd` found no live `sshd-session` process to attach to. The raw investigation directory named in `evidence.json` was also absent, so I could not rerun strace/perf against the sampled PID. The failure signal was not reproduced 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 claiming a reproduced or observed source bug.

The no-patch diagnosis is consistent with the bundle: `sshd-session` was sampled sleeping in `poll_schedule_timeout`/`restart_syscall`, with kernel hot symbols and no symbolized OpenSSH userspace loop. The response also names the relevant local OpenSSH conventions (`ptimeout_*`, `monotime()`, `ppoll()`, `fatal_f`/`error_f`) and reports the project-level validation attempt plus blockers.

Validation reporting is acceptable for a no-patch result: `./configure && make` was attempted from the workspace root and failed because `configure.ac` is newer than `configure`; the focused compile failure and temporary-tree follow-up checks are documented.

## Plan Pass

## Problem

Fixer reported a runaway `sshd-session`, but the bundle does not identify an OpenSSH userspace spin. The sampled process is `S (sleeping)`, blocked in `poll_schedule_timeout`/`restart_syscall`, with one strace line over 5 seconds and kernel hot symbols (`css_rstat_updated`, `tcp_event_new_data_sent`). The OpenSSH server session loop already sleeps via `ppoll()` using local `ptimeout_*` helpers in `misc.c`.

## Evidence Confidence

inferred

## Proposed Subject

No source patch yet: diagnose `sshd-session` poll-wait profiler signal before editing.

## Patch Plan

Do not edit OpenSSH in this pass. The available evidence is profiler-only/indirect and does not show a source-level loop or a user-visible failure suitable for an upstream patch.

Before any later source patch, collect extra evidence that ties CPU use to a specific OpenSSH frame or event-loop condition: an unstripped backtrace, `perf top/report` with userspace symbols, repeated `strace -ttT -p`, and poll fd readiness state if reproducible locally.

If later evidence points at `serverloop.c`, follow the existing maintainer convention there: bounded straight-line checks in `wait_until_can_do_something()`, `fatal_f`/`error_f` for diagnostics, `monotime()` for time decisions, `ptimeout_*` for deadlines, and `ppoll()` with the saved signal mask. Avoid awkward control flow such as avoidable `goto`; this loop already has clean bounded branches.

No prior Fixer patch is present in the workspace (`git status --short` was clean), so there is no existing patch to improve or replace.

## Risks

A speculative patch here would likely misdiagnose normal sleeping `ppoll()` behavior as a busy loop. It could also disturb sensitive sshd session timing, keepalive, rekey, signal, or channel semantics without evidence that those paths are faulty.

The Debian package carries patches including GSSAPI and systemd socket activation, but the observed process is `sshd-session`, while the relevant systemd socket activation changes are mainly in the listener path. No relevant file IO, spawning, or locking helper issue was found; the relevant local helper is the OpenSSH `ptimeout_*` poll-timeout API.

## Validation

For any later patch, first run the project entrypoint from the workspace root:

```sh
./configure && make
```

If that fails due to missing dependencies or generated files, report the exact co

[truncated]

Issue page: /issues/019e0050-4e01-7b63-89ed-d9b6d87a434f. Issue JSON: /v1/issues/019e0050-4e01-7b63-89ed-d9b6d87a434f

python3.13 is stuck in a likely busy poll loop: 15.28% of sampled CPU passed through unresolved offset, with repeated thread backtraces show 2 thread(s) around 0x00007f35495474be in ?? () from target:<path> and 1 thread(s) around 0x000000000057151f in _PyEval_EvalFrameDefault ().

## 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): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `python3.13` 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. 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. 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.

Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `python3.13` 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. 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 `python3.13` 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): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, 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 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 high CPU in `/usr/bin/python3 /usr/bin/unattended-upgrade`. The hot code is `apt_pkg.cpython-313-...so` and `libapt-pkg.so.7.0`, with `strace` dominated by repeated `newfstatat()` probes under `/var/lib/apt/lists`. CPython appears as the host interpreter and generic call machinery (`_PyObject_MakeTpCall`), not as the likely root cause.

## Evidence Confidence
inferred

## Proposed Subject
No CPython patch: diagnose unattended-upgrade APT metadata polling

## Patch Plan
Do not edit the `python3.13` source in this pass. The evidence points through the script/application entrypoint into `python3-apt`/`libapt-pkg`, so an upstream CPython patch would be speculative and not pull-request-ready.

If stronger evidence is collected later, start from `unattended-upgrade` and `python3-apt` symbols rather than changing CPython runtime call paths. I found CPython contribution guidance in `README.rst` and docs guidance in `Doc/README.rst`; Debian packaging notes say quilt is used. In the only nearby CPython areas touched by the trace, local conventions include Argument Clinic, `path_t`, `path_error()`, `Py_BEGIN_ALLOW_THREADS`, and `PyMem_*`, but no relevant CPython helper addresses repeated APT list-file probing. No prior Fixer patch exists in this workspace to improve or replace.

Avoid awkward source changes such as inserting control-flow guards or `goto` paths in CPython’s `Objects/call.c` or `Modules/posixmodule.c`; those would not address the observed hot DSO and syscall pattern.

## Risks
The main risk is misattribution: patching CPython could hide or distort an APT-side performance problem. The embedded raw artifact paths are unavailable in this workspace, so the diagnosis relies on the evidence JSON excerpts rather than full local backtrace/strace files.

## Validation
For any future CPython source patch, first try the workspace-root project entrypoint: `./configure && make`.

For this no-patch diagnosis, the bounded independent check I would attempt is: `timeout 20s strace -f -e trace=newfstatat -c /usr/bin/python3 /usr/bin/unattended-upgrade --dry-run --debug`, only if `unattended-upgrade` is installed and dry-run is available. I would not claim `reproduced` unless that command independently shows the repeated APT list-file `newfstatat()` pattern.

## Patch Pass

Subject: No CPython patch: diagnose APT metadata polling

## Commit Message
No source change. The collected evidence points to `unattended-upgrade` spending CPU in `python3-apt`/`libapt-pkg` while repeatedly probing APT list files, not to a CPython runtime defect.

## Evidence Confidence
inferred

## Issue Connection
The collected signal is a running `/usr/bin/python3 /usr/bin/unattended-upgrade` process with high CPU, 87,511 `newfstatat()` calls in a 5 second trace, and the hottest native path in `apt_pkg.cpython-313-...so` plus `libapt-pkg.so.7.0`. The CPython frames shown are generic execution and call frames, including `_PyObject_MakeTpCall`, rather than a concrete loop in CPython.

I followed the saved plan and did not change course. I inspected CPython contribution/build guidance in `README.rst`, docs guidance in `Doc/README.rst`, Debian source notes in `debian/README.source`, and the nearby CPython call/stat code. Relevant local conventions include Argument Clinic, `path_t`, `path_error()`, `Py_BEGIN_ALLOW_THREADS`, and `PyMem_*`; none address repeated APT repository metadata probing from `unattended-upgrade`.

The specific change is no source diff. The expected effect is to avoid landing a speculative CPython patch and to direct the report toward `unattended-upgrade`, `python3-apt`, or `libapt-pkg`, where the trace actually spends time.

## Git Add Paths
None

## Validation
`./configure && make` from the workspace root completed successfully. The build reported optional modules `_dbm`, `_gdbm`, and `_tkinter` as missing, but no build failure.

Independent reproduction attempt: `timeout 20s strace -f -e trace=newfstatat -c /usr/bin/python3 /usr/bin/unattended-upgrade --dry-run --debug` could not run because ptrace is blocked in this environment: `PTRACE_TRACEME: Operation not permitted` and `ptrace(PTRACE_SEIZE, 5): Operation not permitted`. Therefore I did not independently reproduce the syscall pattern.

## Review Pass 1

RESULT: ok

No source diff is present, and `git status --short` is clean. The author correctly used `inferred`, avoided a speculative CPython patch, connected the evidence to `unattended-upgrade`/`python3-apt`/`libapt-pkg`, named relevant CPython conventions, and reported project-level validation plus the ptrace blocker for independent strace reproduction.

## Plan Pass

## Problem
Fixer observed high CPU in `/usr/bin/python3 /usr/bin/unattended-upgrade`. The hot code is `apt_pkg.cpython-313-...so` and `libapt-pkg.so.7.0`, with `strace` dominated by repeated `newfstatat()` probes under `/var/lib/apt/lists`. CPython appears as the host interpreter and generic call machinery (`_PyObject_MakeTpCall`), not as the likely root cause.

## Evidence Confidence
inferred

## Proposed Subject
No CPython patch: diagnose unattended-upgrade APT metadata polling

## Patch Plan
Do not edit the `python3.13` source in this pass. The evidence points through the script/application entrypoint into `python3-apt`/`libapt-pkg`, so an upstream CPython patch would be speculative and not pull-request-ready.

If stronger evidence is collected later, start from `unattended-upgrade` and `python3-apt` symbols rather than changing CPython runtime call paths. I found CPython contribution guidance in `README.rst` and docs guidance in `Doc/README.rst`; Debian packaging notes say quilt is used. In the only nearby CPython areas touched by the trace, local conventions include Argument Clinic, `path_t`, `path_error()`, `Py_BEGIN_ALLOW_THREADS`, and `PyMem_*`, but no relevant CPython helper addresses repeated APT list-file probing. No prior Fixer patch exists in this workspace to improve or replace.

Avoid awkward source changes such as inserting control-flow guards or `goto` paths in CPython’s `Objects/call.c` or `Modules/posixmodule.c`; those would not address the observed hot DSO and syscall pattern.

## Risks
The main risk is misattribution: patching CPython could hide or distort an APT-side performance problem. The embedded raw artifact paths are unavailable in this workspace, so the diagnosis relies on the evidence JSON excerpts rather than full local backtrace/strace files.

## Validation
For any future CPython source patch, first try the workspace-root project entrypoint: `./configure && make`.

For this no-patch diagnosis, the bounded independent check I would attempt is: `timeout 20s strace -f -e trace=newfstatat -c /usr/bin/python3 /usr/bin/unattended-upgrade --dry-run --debug`, only if `unattended-upgrade` is installed and dry-run is available. I would not claim `reproduced` unless that command independently shows the repeated APT list-file `newfstatat()` pattern.

## Patch Pass

Subject: No CPython patch: diagnose APT metadata polling



[truncated]

Issue page: /issues/019dd98b-0e1d-76e3-9171-f0f72c689536. Issue JSON: /v1/issues/019dd98b-0e1d-76e3-9171-f0f72c689536

sshd-auth is stuck in a likely busy poll loop: 50.00% of sampled CPU passed through sched_balance_newidle, with repeated read x3, write x2, clock_nanosleep x1.

## 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): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `openssh` 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. 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. 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.

Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `openssh` 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. 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 `openssh` 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): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, 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 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/lib/openssh/sshd-auth` as a likely busy-poll/runaway process. The embedded evidence does not show a sustained busy loop: the sampled process was sleeping, total CPU was `0.1%`, the strace excerpt contains one `clock_nanosleep`, one `ppoll`, then `ECONNRESET`, a log write, and `exit_group(255)`.

## Evidence Confidence

inferred

## Proposed Subject

No source patch yet: treat this as a diagnosis/report plan unless an independent reproduction shows repeated nonblocking `ppoll` wakeups or measurable auth-child CPU burn.

## Patch Plan

Do not edit files in this pass. The current evidence looks more like a normal pre-auth failure/reset path than a confirmed OpenSSH bug: `auth2.c` intentionally uses `nanosleep()` for authentication failure timing, and `packet.c` uses `ppoll()` in `ssh_packet_read_seqnr()` / `ssh_packet_write_wait()` around packet IO. The final `ECONNRESET` maps to existing `sshpkt_vfatal()` handling that logs “Connection reset by ...” and exits.

If later evidence proves a real loop, inspect and patch the narrow packet/auth path using existing OpenSSH conventions: `sshbuf` APIs, `sshpkt_*`/`ssh_packet_*` helpers, `fatal_fr`/`sshpkt_fatal` error style, and timeout helpers `ms_to_timespec`, `ms_subtract_diff`, `monotime_tv`. Avoid introducing avoidable `goto` control flow where a bounded return or loop break is cleaner.

No prior Fixer patch or local `*fixer*`/extra patch artifact was found to improve or replace. Debian carries many packaging patches, but this should remain upstream-style and not become a Debian-local workaround.

## Risks

The main risk is overfitting to indirect profiler evidence. A patch that changes auth delay, reset handling, or packet polling without a reproduced loop could weaken timing behavior, alter expected disconnect logging, or regress pre-auth protocol handling.

The raw artifact paths in `evidence.json` were not present under `/var/lib/fixer`, so only embedded excerpts were available.

## Validation

Before any future source edit, try the project-level entrypoint from the workspace root:

```sh
./configure && make
```

If that fails because dependencies or generated files are missing, record the exact failure, then run the narrowest relevant compile target, likely the objects touching `auth2.c`, `packet.c`, and `sshd-auth.c`.

For a bounded independent reproduction attempt, run a local high-port `sshd`/`sshd-auth` auth-reset scenario under `strace -f -e trace=read,write,ppoll,clock_nanosleep,exit_group` and confirm whether it actually repeats rapid `ppoll` wakeups or simply sleeps, logs `ECONNRESET`, and exits as the Fixer excerpt shows.

## Patch Pass

Subject: diagnose sshd-auth busy-poll evidence as inconclusive

## Commit Message
No source change was made. The collected trace looks like a normal pre-auth disconnect path, not a confirmed busy-poll loop: `sshd-auth` slept, wrote a packet, observed `ECONNRESET`, logged the reset, and exited.

## Evidence Confidence
inferred

## Issue Connection
Fixer reported `/usr/lib/openssh/sshd-auth` as a likely busy-poll/runaway process, but the embedded `/proc` and strace evidence shows `State: S (sleeping)`, total CPU around `0.1%`, one `clock_nanosleep`, one `ppoll`, then `read(...) = -1 ECONNRESET` and `exit_group(255)`.

The cautious code-level inference is that this follows existing OpenSSH pre-authentication control flow: `auth2.c` may intentionally sleep to smooth authentication failure timing, `packet.c` waits with `ppoll()` in `ssh_packet_read_seqnr()` / `ssh_packet_write_wait()`, and `sshpkt_vfatal()` maps `ECONNRESET` to the logged “Connection reset by ...” exit path. I did not find direct evidence of repeated immediate `ppoll()` wakeups or sustained CPU burn.

The specific change made is no source diff. This follows the saved plan instead of landing an inferred patch that would alter authentication timing or packet I/O without a reproduced defect. The expected effect is no runtime behavior change and a stronger upstream bug-report position: collect a trace that demonstrates repeated nonblocking wakeups before changing OpenSSH packet/auth logic.

Local conventions checked: `README.md` documents the portable OpenSSH build flow; nearby code uses `sshbuf`, `sshpkt_*`/`ssh_packet_*`, `fatal_fr`/`sshpkt_fatal`, and timeout helpers such as `ms_to_timespec`, `ms_subtract_diff`, and `monotime_tv`. No relevant new helper was needed because no source API was introduced.

## Git Add Paths
None

## Validation
Tried the required workspace-root entrypoint:

```sh
./configure && make
```

It failed immediately with:

```text
configure: error: ./configure.ac newer than configure, run autoreconf
```

To avoid generated-file churn in the proposal workspace, I made a clean temporary archive copy and ran:

```sh
autoreconf
./configure
make packet.o auth2.o sshd-auth.o
```

That focused compile succeeded in `/tmp/openssh-fixer-89278-build`.

I also attempted a bounded local `sshd`/`strace` smoke reproduction of the collected reset/poll signal. It was blocked by the sandbox: `strace` failed with `Operation not permitted`, and the localhost SSH client failed with `socket: Operation not permitted`, so the busy-poll signal was not independently reproduced.

## Review Pass 1

RESULT: ok

No blocking review findings.

The first pass correctly leaves no source diff for `inferred` evidence. The workspace is clean, and comparison against the original snapshot shows no source changes beyond workspace metadata and ignored `config.log`.

The author output includes the required `## Evidence Confidence` section with a valid value, does not claim reproduction, and explains why the embedded perf/strace/proc evidence is insufficient for an upstream source patch. Validation also meets the requirement: `./configure && make` was attempted first and failed with the exact stale-`configure` blocker, followed by a clean temporary `autoreconf && ./configure && make packet.o auth2.o sshd-auth.o` focused compile and a bounded reproduction attempt that was blocked by sandbox ptrace/socket restrictions.

## Plan Pass

## Problem

Fixer flagged `/usr/lib/openssh/sshd-auth` as a likely busy-poll/runaway process. The embedded evidence does not show a sustained busy loop: the sampled process was sleeping, total CPU was `0.1%`, the strace excerpt contains one `clock_nanosleep`, one `ppoll`, then `ECONNRESET`, a log write, and `exit_group(255)`.

## Evidence Confidence

inferred

## Proposed Subject

No source patch yet: treat this as a diagnosis/report plan unless an independent reproduction shows repeated nonblocking `ppoll` wakeups or measurable auth-child CPU burn.

## Patch Plan

Do not edit files in this pass. The current evidence looks more like a normal pre-auth failure/reset path than a confirmed OpenSSH bug: `auth2.c` intentionally uses `nanosleep()` for authentication failure timing, and `packet.c` uses `ppoll()` in `ssh_packet_read_seqnr()` / `ssh_packet_write_wait()` around packet IO. The final `ECONNRESET` maps to existing `sshpkt_vfatal()` handling that logs “Connection reset by ...” and exits.

If later evidence proves a real loop, inspect and patch the narrow packet/auth path using existing OpenSSH conventions: `sshbuf` APIs, `sshpkt_*`/`ssh_packet_*` helpers, `fatal_fr`/`sshpkt_fatal` error style, and timeout helpers `ms_to_timespec`, `ms_subtract_diff`, `monotime_tv`. Avoid introducing avoidable `goto` control flow where a bounded return or loop break is cleaner.

No prior Fixer patch or local `*fixer*`/extra patch artifact was found to improve or replace. Debian carries many packaging patches, but this should remain upstream-style and not become a Debian-local workaround.

## Risks

The main risk is overfitting to indirect profiler evidence. A patch that changes auth delay, reset handling, or packet polling without a reproduced loop could weaken timing behavior, alter expected disconnect logging, or regress pre-auth protocol handling.

The raw artifact paths in `evidence.json` were not present under `/var/lib/fixer`, so only embedded excerpts were available.

## Validation

Before any future source edit, try the project-level entrypoint from the workspace root:

```sh
./configure && make
```

If that fails because dependencies or generated files are missing, record the exact failure, then run the narrowest relevant compile target, likely the objects touching `auth2.c`, `packet.c`, and `sshd-auth.c`.

For a bounded independent reproduction a

[truncated]

Issue page: /issues/019e1143-27cd-7d43-a2e8-5b81b4f87038. Issue JSON: /v1/issues/019e1143-27cd-7d43-a2e8-5b81b4f87038

sshd-session is stuck in a likely unclassified userspace loop: 10.54% of sampled CPU passed through _raw_spin_lock, with repeated thread backtraces show 1 thread(s) around 0x00007f941209a7d2 in ?? () from target:<path>.

## 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): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `openssh` 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. 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. 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.

Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `openssh` 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. 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 `openssh` 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): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, 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 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 `sshd-session` as a runaway CPU candidate, but the collected signal is not source-actionable: the sampled process was sleeping in `poll`/`restart_syscall`, reported only `0.1%` total CPU across three processes, and the hot symbols were kernel-side (`_raw_spin_lock`, `vm_normal_page`, `fput`) rather than symbolized OpenSSH frames.

## Evidence Confidence
inferred

## Proposed Subject
No OpenSSH source patch yet: require a symbolized, repeated userspace hotspot before editing.

## Patch Plan
Do not edit files in this pass. The best plan is to reject a speculative mitigation until extra evidence identifies a userspace loop in `sshd-session`.

Before any future patch, collect at least one of:
- A symbolized backtrace/perf sample against an unstripped or locally built `sshd-session`.
- A repeated strace/perf capture showing rapid wakeups from `ppoll` rather than a sleeping `poll`.
- A specific OpenSSH function or channel/session state that remains runnable without progress.

Relevant local conventions found: OpenSSH uses `ptimeout_*` helpers in `misc.c`, `ppoll` in `serverloop.c`, `channel_prepare_poll()`/`channel_after_poll()` in `channels.c`, `xcalloc`/`xrecallocarray` for allocation, and `fatal_f`/`debug*`/`logit` for diagnostics. Only `README.md` was found among requested contribution/style docs; no `CONTRIBUTING`, `HACKING`, `README-hacking`, `docs/`, or `dev-docs/` were present.

No prior Fixer patch for this `openssh` finding was found in the current proposal. Debian’s `gssapi.patch` touches related loop areas, but the evidence does not implicate GSSAPI, so a GSSAPI workaround would be speculative.

## Risks
A source patch based on this evidence would likely add awkward control flow or artificial throttling around a normal blocking `ppoll` path. That could mask real bugs, alter latency, or create upstream-unfriendly behavior without addressing the observed kernel/profile signal.

## Validation
If later evidence supports a patch, first try the project-level entrypoint from the workspace root:

```sh
./configure && make
```

Then run the narrowest relevant check, likely a local `sshd-session`/`sshd` smoke test plus the affected unit/regress test if the change touches `ptimeout_*`, channels, or `server_loop2`.

Bounded independent reproduction attempt before editing: build locally, run a throwaway debug `sshd` session from the workspace with a temporary config and host key, keep one idle session open briefly, and sample `ps`/`strace`/`perf` for repeated `ppoll` wakeups or measurable CPU. Do not claim `reproduced` unless that command actually shows the failure.

## Patch Pass

Subject: openssh: no patch for unsymbolized sshd-session poll sample

## Commit Message
No source change is made. The collected evidence looks more like an idle or interrupted `sshd-session` blocked in `poll` than a confirmed OpenSSH userspace spin: `/proc` reported the process sleeping, strace captured only one resumed `restart_syscall`, and perf’s hottest frames were kernel symbols rather than symbolized OpenSSH code.

## Evidence Confidence
inferred

## Issue Connection
The collected signal was a Fixer runaway-process investigation for `sshd-session`, with a backtrace ending in `poll`, `wchan` set to `poll_schedule_timeout.constprop.0`, process state `S (sleeping)`, and only one strace line over five seconds. The cautious inference is that the alert may be from an interrupted blocking poll or kernel-side sampling noise, not from a proven userspace event loop in OpenSSH.

I followed the saved plan in `plan-output.txt` and did not leave a source diff. The relevant OpenSSH path already uses local conventions: `serverloop.c` waits via `ppoll`, `misc.c` provides `ptimeout_*` timeout helpers, `channels.c` translates channel state through `channel_prepare_poll()` and `channel_after_poll()`, allocation uses `xcalloc`/`xrecallocarray`, and diagnostics use `fatal_f`, `debug*`, and `logit`. Only `README.md` was present among the requested contribution/style docs.

The expected effect is no runtime behavior change. A patch should wait for stronger evidence, such as a symbolized userspace hotspot, repeated rapid `ppoll` wakeups, or a specific channel/session state that remains runnable without progress.

## Git Add Paths
None

## Validation
`./configure && make` from the workspace root failed before building:
```text
configure: error: ./configure.ac newer than configure, run autoreconf
```

Focused syntax checks could not proceed because `config.h` was not generated:
```text
cc -fsyntax-only -I. -Iopenbsd-compat -DHAVE_CONFIG_H serverloop.c
includes.h:19:10: fatal error: config.h: No such file or directory
```

Same blocker for:
```text
cc -fsyntax-only -I. -Iopenbsd-compat -DHAVE_CONFIG_H misc.c
```

Independent reproduction was attempted but not reproduced. `pgrep -a sshd-session` found no live target process, and the raw investigation directory named in `evidence.json` was not present, so I could not attach `strace`/`perf` to the original sampled process. `git status --short` remained clean.

## Review Pass 1

RESULT: ok

No source changes are present, and the no-patch diagnosis is appropriate for the evidence level. The response correctly classifies confidence as `inferred`, avoids inventing a reproduced failure, reports `Git Add Paths` as `None`, and explains why the profiler/strace/proc evidence is not enough for an upstreamable OpenSSH source patch.

Validation reporting is acceptable: it attempted the workspace-root `./configure && make`, included the exact blocker, and documented why narrower syntax checks and independent reproduction could not proceed.

## Plan Pass

## Problem
Fixer flagged `sshd-session` as a runaway CPU candidate, but the collected signal is not source-actionable: the sampled process was sleeping in `poll`/`restart_syscall`, reported only `0.1%` total CPU across three processes, and the hot symbols were kernel-side (`_raw_spin_lock`, `vm_normal_page`, `fput`) rather than symbolized OpenSSH frames.

## Evidence Confidence
inferred

## Proposed Subject
No OpenSSH source patch yet: require a symbolized, repeated userspace hotspot before editing.

## Patch Plan
Do not edit files in this pass. The best plan is to reject a speculative mitigation until extra evidence identifies a userspace loop in `sshd-session`.

Before any future patch, collect at least one of:
- A symbolized backtrace/perf sample against an unstripped or locally built `sshd-session`.
- A repeated strace/perf capture showing rapid wakeups from `ppoll` rather than a sleeping `poll`.
- A specific OpenSSH function or channel/session state that remains runnable without progress.

Relevant local conventions found: OpenSSH uses `ptimeout_*` helpers in `misc.c`, `ppoll` in `serverloop.c`, `channel_prepare_poll()`/`channel_after_poll()` in `channels.c`, `xcalloc`/`xrecallocarray` for allocation, and `fatal_f`/`debug*`/`logit` for diagnostics. Only `README.md` was found among requested contribution/style docs; no `CONTRIBUTING`, `HACKING`, `README-hacking`, `docs/`, or `dev-docs/` were present.

No prior Fixer patch for this `openssh` finding was found in the current proposal. Debian’s `gssapi.patch` touches related loop areas, but the evidence does not implicate GSSAPI, so a GSSAPI workaround would be speculative.

## Risks
A source patch based on this evidence would likely add awkward control flow or artificial throttling around a normal blocking `ppoll` path. That could mask real bugs, alter latency, or create upstream-unfriendly behavior without addressing the observed kernel/profile signal.

## Validation
If later evidence supports a patch, first try the project-level entrypoint from the workspace root:

```sh
./configure && make
```

Then run the narrowest relevant check, likely a local `sshd-session`/`sshd` smoke test plus the affected unit/regress test if the change touches `ptimeout_*`, channels, or `server_loop2`.

Bounded independent reproduction attempt before editing: build locally, run a throwaway debug `sshd` session 

[truncated]

Issue page: /issues/019df1e5-ae1f-70b0-aa74-abaa70425ffd. Issue JSON: /v1/issues/019df1e5-ae1f-70b0-aa74-abaa70425ffd

postgres is stuck in a likely busy poll loop: 11.93% of sampled CPU passed through filemap_map_pages, with repeated thread backtraces show 1 thread(s) around 0x00007f322d29a7d2 in ?? () from target:<path>.

## 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): `./configure && make`, `meson setup build-fix && meson compile -C build-fix && meson test -C build-fix`, `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `postgresql-18` 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. 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. 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.

A previous Fixer patch attempt already exists for this issue. It was generated by Fixer `0.145.0`. Review that patch before changing code, improve it instead of starting blind, and clean up anything awkward or underexplained. In particular, remove avoidable `goto`, tighten the explanation of what the patch is doing, and make the resulting diff feel ready for upstream git review.
- Prior patch: `./prior-best.patch`
- Prior published session: `./prior-best-session.md`

Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `./configure && make`, `meson setup build-fix && meson compile -C build-fix && meson test -C build-fix`, `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `postgresql-18` 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. 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 `postgresql-18` 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): `./configure && make`, `meson setup build-fix && meson compile -C build-fix && meson test -C build-fix`, `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, 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 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 `postgres` as a likely busy-poll loop, but the collected evidence shows the sampled postmaster in `epoll_wait()` via `WaitEventSetWait()`, process state `S (sleeping)`, `wchan=do_epoll_wait`, only one captured `epoll_wait` line over 5 seconds, and about 0.8% total CPU across 9 postgres processes. That does not demonstrate a PostgreSQL userspace spin or repeated rapid wakeups.

## Evidence Confidence
inferred

## Proposed Subject
No patch: report inconclusive postmaster `epoll_wait` sample

## Patch Plan
Do not edit source files unless stronger evidence is collected first. A source patch is blocked because the current bundle is profiler/trace classification only and does not identify a PostgreSQL wakeup source or loop body.

Relevant code inspected:
`ServerLoop()` in `src/backend/postmaster/postmaster.c` waits through `WaitEventSetWait()` with `DetermineSleepTime()`.
`src/backend/storage/ipc/waiteventset.c` wraps `epoll_wait()` and uses PostgreSQL latch/wait abstractions.

Local conventions/helpers to follow if later evidence supports a patch: `WaitEventSetWait`, `AddWaitEventToSet`, `ResetLatch`, `MemoryContextAllocZero`, `AcquireExternalFD`/`ReleaseExternalFD`, `elog`/`ereport`, and PostgreSQL pgindent style. Contribution docs found: `README.md`, `.github/CONTRIBUTING.md`, `doc/`, and `src/tools/pgindent`.

Prior Fixer output should be improved/replaced by a clean no-patch diagnosis. Do not carry generated build artifacts such as `GNUmakefile` or `objfiles.txt` into a patch. If a later fix is justified, keep control flow bounded and local; avoid awkward `goto` where a clear conditional or loop guard is enough.

## Risks
Changing the postmaster wait loop without direct evidence could add latency, mask latch/socket readiness, or alter shutdown and connection handling behavior.

The raw investigation directory referenced in `evidence.json` is not present, so analysis is limited to the JSON excerpts.

## Validation
First try the project-level entrypoint from the workspace root:

`./configure && make`

Then, if available and not blocked:

`make check`

Bounded independent reproduction attempt: after a successful build, initialize and start a temporary PostgreSQL cluster, then sample an idle postmaster with `strace -ttT -e epoll_wait -p <pid>` for a few seconds. Only claim `reproduced` if that shows repeated rapid `epoll_wait` returns matching the busy-poll signal; otherwise keep confidence as `inferred` and report the blocker or non-reproduction.

## Patch Pass

Subject: No patch: report inconclusive postmaster wait sample

## Commit Message
No source change was made. The collected perf, strace, and `/proc` evidence is more consistent with an idle postmaster blocked in PostgreSQL’s wait-event loop than with a confirmed PostgreSQL busy-poll bug.

## Evidence Confidence
inferred

## Issue Connection
Fixer classified `postgres` as a busy-poll loop from a short profile, with the sampled backtrace passing through `WaitEventSetWait()` to `epoll_wait()`. The same bundle shows `S (sleeping)`, `wchan=do_epoll_wait`, one captured `epoll_wait` line over 5 seconds, and about 0.8% total CPU across 9 postgres processes.

The cautious inference is that the postmaster was in its normal `ServerLoop()` idle path, using PostgreSQL’s `WaitEventSetWait()` abstraction over `epoll_wait()`, not spinning in userspace. The hot symbol was kernel-side `filemap_map_pages`, and the raw investigation directory was unavailable for deeper confirmation.

I followed the saved plan and did not leave a source diff. The prior Fixer patch artifact was not an upstreamable fix; it consisted of generated build files such as `GNUmakefile` and `objfiles.txt`, so it was replaced by this no-patch diagnosis. Local conventions inspected include `WaitEventSetWait`, `AddWaitEventToSet`, `ResetLatch`, `MemoryContextAllocZero`, `AcquireExternalFD`/`ReleaseExternalFD`, `elog`/`ereport`, and pgindent style. The expected effect is no behavioral change, avoiding a speculative postmaster wait-loop patch without evidence of repeated rapid wakeups.

## Git Add Paths
None

## Validation
`./configure && make` from the workspace root: passed.

`make check` from the workspace root: failed during temporary install setup because `initdb` refuses to run as root. Exact blocker from `tmp_install/log/initdb-template.log`: `initdb: error: cannot be run as root`.

Bounded independent reproduction attempt: tried to initialize a temporary cluster as `nobody` for `strace -ttT -e epoll_wait -p <pid>` sampling. Blocked by sandbox privilege restrictions: `runuser: cannot set groups: Operation not permitted`; `setpriv --reuid=nobody --regid=nogroup --clear-groups ...` failed with `setpriv: setresuid failed: Invalid argument`.

Cleaned generated validation artifacts with `make distclean`; final `git status --short` and `git diff --stat` are clean.

## Review Pass 1

RESULT: ok

No source patch is present: `git status --short`, `git diff --stat`, and `git diff --` are clean. The author correctly keeps `## Evidence Confidence` as `inferred`, lists `## Git Add Paths` as `None`, and does not claim a reproduced PostgreSQL bug from profiler-only evidence.

The no-patch diagnosis matches the bundle: the sampled process was sleeping in `epoll_wait()` via `WaitEventSetWait()`, with `wchan=do_epoll_wait`, one strace line over 5 seconds, and low total CPU. The response also names the relevant PostgreSQL helpers and conventions, rejects the prior generated-artifact patch, and reports project-level validation plus the exact `make check` root/initdb blocker and failed reproduction attempt.

## Plan Pass

## Problem
Fixer flagged `postgres` as a likely busy-poll loop, but the collected evidence shows the sampled postmaster in `epoll_wait()` via `WaitEventSetWait()`, process state `S (sleeping)`, `wchan=do_epoll_wait`, only one captured `epoll_wait` line over 5 seconds, and about 0.8% total CPU across 9 postgres processes. That does not demonstrate a PostgreSQL userspace spin or repeated rapid wakeups.

## Evidence Confidence
inferred

## Proposed Subject
No patch: report inconclusive postmaster `epoll_wait` sample

## Patch Plan
Do not edit source files unless stronger evidence is collected first. A source patch is blocked because the current bundle is profiler/trace classification only and does not identify a PostgreSQL wakeup source or loop body.

Relevant code inspected:
`ServerLoop()` in `src/backend/postmaster/postmaster.c` waits through `WaitEventSetWait()` with `DetermineSleepTime()`.
`src/backend/storage/ipc/waiteventset.c` wraps `epoll_wait()` and uses PostgreSQL latch/wait abstractions.

Local conventions/helpers to follow if later evidence supports a patch: `WaitEventSetWait`, `AddWaitEventToSet`, `ResetLatch`, `MemoryContextAllocZero`, `AcquireExternalFD`/`ReleaseExternalFD`, `elog`/`ereport`, and PostgreSQL pgindent style. Contribution docs found: `README.md`, `.github/CONTRIBUTING.md`, `doc/`, and `src/tools/pgindent`.

Prior Fixer output should be improved/replaced by a clean no-patch diagnosis. Do not carry generated build artifacts such as `GNUmakefile` or `objfiles.txt` into a patch. If a later fix is justified, keep control flow bounded and local; avoid awkward `goto` where a clear conditional or loop guard is enough.

## Risks
Changing the postmaster wait loop without direct evidence could add latency, mask latch/socket readiness, or alter shutdown and connection handling behavior.

The raw investigation directory referenced in `evidence.json` is not present, so analysis is limited to the JSON excerpts.

## Validation
First try the project-level entrypoint from the workspace root:

`./configure && make`

Then, if available and not blocked:

`make check`

Bounded independent reproduction attempt: after a successful build, initialize and start a temporary PostgreSQL cluster, then sample an idle postmaster with `strace -ttT -e epoll_wait -p <pid>` for a few seconds. Only claim `reproduced` if that shows repeated rapid `epoll_wai

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Issue page: /issues/019dda03-7a7e-7fd1-bf01-105bf190069d. Issue JSON: /v1/issues/019dda03-7a7e-7fd1-bf01-105bf190069d

AppArmor denied lsusb: open /

Issue page: /issues/019e107e-15fd-7642-b5ae-caa71b83768c. Issue JSON: /v1/issues/019e107e-15fd-7642-b5ae-caa71b83768c

sshd-session is stuck in a likely unclassified userspace loop: 100.00% of sampled CPU passed through alloc_iova_fast, with repeated thread backtraces show 1 thread(s) around 0x00007f27fda9a7d2 in ?? () from target:<path>.

## 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): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `openssh` 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. 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. 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.

Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `openssh` 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. 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 `openssh` 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): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, 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 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 `sshd-session` as a runaway-process candidate, but the collected evidence shows a sleeping process in `poll`/`restart_syscall` with `wchan=poll_schedule_timeout.constprop.0`, total CPU around `0.1%`, and the hot symbol in the kernel (`alloc_iova_fast`), not in OpenSSH userspace.

## Evidence Confidence
inferred

## Proposed Subject
No upstream OpenSSH source patch from this bundle; prepare a diagnosis/needs-more-evidence report instead of a speculative code change.

## Patch Plan
Do not edit files in this pass. I checked `README.md`, `README`, and `regress/README.regress`; contributions follow OpenBSD style. The relevant subsystem is `serverloop.c`/`channels.c`, where the session loop uses local helpers `ptimeout_*()`, `monotime()`, `ssh_signal()`, `xrecallocarray()`, and OpenSSH logging/fatal helpers.

The observed stack maps to the normal `server_loop2()` path waiting in `ppoll()` after `channel_prepare_poll()`. The evidence does not show a userspace busy loop, repeated zero-timeout poll, or OpenSSH frame consuming CPU. Raw artifact paths listed in `evidence.json` were not present for direct inspection, so a maintainer-facing report should state that the Fixer signal is indirect and internally inconsistent.

No prior Fixer patch is present in the workspace (`git status` is clean), so there is nothing to improve or replace. If later evidence proves an OpenSSH loop, the likely patch area would be bounded timeout scheduling in `serverloop.c`/`channels.c` using the existing `ptimeout_*()` helpers and OpenBSD style, avoiding awkward new `goto` control flow.

## Risks
A source patch now would likely paper over a kernel, profiler attribution, or environment issue rather than fixing OpenSSH. Adding artificial sleeps or changing `ppoll()` deadlines could regress latency, keepalives, rekey timing, child collection, or channel inactivity handling.

## Validation
Before any future patch validation, try the project entrypoint from the workspace root: `./configure && make`.

For a bounded independent check, build and run `make tests LTESTS=connect`, then sample any test `sshd-session` with `ps -o pid,stat,pcpu,wchan:32,cmd` and, if attach permissions allow, `timeout 5 strace -p <pid> -e trace=poll,ppoll`. This can show whether a local session spins or simply sleeps in poll, but it should not be reported as `reproduced` unless it actually demonstrates the runaway signal.

## Patch Pass

Subject: Diagnose sshd-session poll sample without source changes

## Commit Message
The likely root cause is not an OpenSSH userspace spin. The collected perf sample attributes CPU to the kernel symbol `alloc_iova_fast`, while `/proc` and strace show `sshd-session` sleeping in `poll`/`restart_syscall` with `wchan=poll_schedule_timeout.constprop.0` and only about `0.1%` total CPU.

I followed the saved plan and left the tree unchanged. OpenSSH’s session loop already uses local timeout helpers (`ptimeout_*()` and `monotime()`), allocation helpers (`xrecallocarray()`), and project logging/fatal conventions. The evidence is too indirect and internally inconsistent for an upstream source patch.

## Evidence Confidence
inferred

## Issue Connection
The collected signal is a Fixer runaway-process report for `sshd-session`, with a backtrace stopped in `poll`, one strace line showing `restart_syscall(<... resuming interrupted poll ...>`, `/proc` reporting the process as sleeping, and the sampled hot symbol coming from the kernel rather than OpenSSH.

The cautious code-level inference is that this is the normal server session event loop waiting for input, not a proven busy loop in `serverloop.c` or `channels.c`. I inspected that path and found it uses OpenSSH’s local poll-timeout helpers (`ptimeout_*()`), monotonic clock helper (`monotime()`), logging helpers, and OpenBSD style conventions noted by `README`.

I made no source change. A source patch here would have to invent a failure mode not shown by the bundle, such as a repeated zero-timeout `ppoll`, and could regress keepalives, rekey timing, child collection, or channel inactivity handling.

The expected effect of this no-patch diagnosis is to avoid an upstream-unready change and preserve a clear report: stronger evidence should first show an OpenSSH userspace loop, preferably with symbolized OpenSSH frames or a reproducible test.

## Git Add Paths
None

## Validation
Checked style/docs and local conventions: `README.md`, `README`, and `regress/README.regress`; relevant helpers inspected in `serverloop.c`, `channels.c`, and `misc.c`.

Workspace-root entrypoint attempted:
`./configure && make`
Failed immediately with:
`configure: error: ./configure.ac newer than configure, run autoreconf`

Narrow reproducible build in a temporary copy to avoid dirtying the proposal tree:
`autoreconf && ./configure && make`
Passed in `/tmp/openssh-fixer-optJWs/src`.

Bounded reproduction attempt:
`make tests LTESTS=connect`
Blocked in the temporary tree during `sshd_proxy` setup:
`Unsupported option UsePAM`
`Missing privilege separation directory: /var/empty`
`FATAL: sshd_proxy broken`

Additional smoke checks:
`./sshd-session` exited with `sshd-session should not be executed directly`.
`./sshd -T -f /dev/null` exited with `sshd: no hostkeys available -- exiting.`

I did not reproduce the reported runaway signal locally, and the proposal workspace remains clean.

## Review Pass 1

RESULT: ok

No blocking review findings.

The generated response correctly treats the bundle as indirect/inconsistent evidence and leaves no source diff for `inferred` confidence. The workspace has no tracked source changes, and diffing against the original snapshot shows no substantive patch content. The explanation is appropriately cautious: it connects the `poll`/`restart_syscall`, sleeping `/proc` state, low CPU, and kernel-only hot symbol to a no-patch diagnosis instead of inventing an OpenSSH bug.

Validation is acceptable for a no-patch report: it attempted the required workspace-root `./configure && make`, reported the exact blocker, then built successfully in a temporary regenerated tree and documented the bounded `connect` reproduction attempt blocker. Style/helper review is also covered with `README`, `README.md`, `regress/README.regress`, and the relevant `ptimeout_*()`, `monotime()`, `xrecallocarray()`, and logging conventions.

## Plan Pass

## Problem
Fixer flagged `sshd-session` as a runaway-process candidate, but the collected evidence shows a sleeping process in `poll`/`restart_syscall` with `wchan=poll_schedule_timeout.constprop.0`, total CPU around `0.1%`, and the hot symbol in the kernel (`alloc_iova_fast`), not in OpenSSH userspace.

## Evidence Confidence
inferred

## Proposed Subject
No upstream OpenSSH source patch from this bundle; prepare a diagnosis/needs-more-evidence report instead of a speculative code change.

## Patch Plan
Do not edit files in this pass. I checked `README.md`, `README`, and `regress/README.regress`; contributions follow OpenBSD style. The relevant subsystem is `serverloop.c`/`channels.c`, where the session loop uses local helpers `ptimeout_*()`, `monotime()`, `ssh_signal()`, `xrecallocarray()`, and OpenSSH logging/fatal helpers.

The observed stack maps to the normal `server_loop2()` path waiting in `ppoll()` after `channel_prepare_poll()`. The evidence does not show a userspace busy loop, repeated zero-timeout poll, or OpenSSH frame consuming CPU. Raw artifact paths listed in `evidence.json` were not present for direct inspection, so a maintainer-facing report should state that the Fixer signal is indirect and internally inconsistent.

No prior Fixer patch is present in the workspace (`git status` is clean), so there is nothing to improve or replace. If later evidence proves an OpenSSH loop, the likely patch area would be bounded timeout scheduling in `serverloop.c`/`channels.c` using the existing `ptimeout_*()` helpers and OpenBSD style, avoiding awkward new `goto` control flow.

## Risks
A source patch now would likely paper over a kernel, profiler attribution, or environment issue rather than fixing OpenSSH. Adding artificial sleeps or changing `ppoll()` deadlines could regress latency, keepalives, rekey timing, child collection, or channel inactivity handling.

## Validation
Before any future patch validation, try the project entrypoint from the workspace root: `./configure && make`.

For a bounded independent check, build and run `make tests LTESTS=connect`, then sample any test `sshd-session` with `ps -o pid,stat,pcpu,wchan:32,cmd` and, if attach permissions allow, `timeout 5 strace -p <pid> -e trace=poll,ppoll`. This can show whether a local session spins or simply sleeps in poll, but it should not be reported as `reproduced` unless it ac

[truncated]

Issue page: /issues/019e0ebd-350b-74c0-9bb0-91ffeb4e0374. Issue JSON: /v1/issues/019e0ebd-350b-74c0-9bb0-91ffeb4e0374

sshd-auth is stuck in a likely busy poll loop: 50.00% of sampled CPU passed through _raw_spin_lock, with repeated read x3, write x2, clock_nanosleep x1.

## 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): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `openssh` 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. 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. 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.

Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, or evidence limit you found, or say that no relevant local helper was found. Treat this as a `openssh` 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. 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 `openssh` 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): `./configure && make`. If the project-level command fails because dependencies or generated files are missing, 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 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 an `sshd-auth` preauth process labelled `[net]` with a profiler classification of likely busy-poll, but the concrete artifacts do not show a sustained userspace loop. The strace shows blocking `read(3)` on the monitor fd, expected authentication delay via `clock_nanosleep`, writes to the network fd, then `ECONNRESET` and exit. Kernel stack/wchan also show sleeping in `unix_stream_read_generic`, and sampled CPU was only 0.1%.

## Evidence Confidence

inferred

## Proposed Subject

No source patch yet: diagnose `sshd-auth` busy-poll report as non-actionable without an independently captured loop.

## Patch Plan

Do not edit files in this pass. The evidence is profiler-only/indirect and appears consistent with normal OpenSSH preauth behavior around failed authentication and client disconnect.

Relevant subsystem conventions found: OpenSSH uses `atomicio()` for complete fd reads/writes, `sshbuf` for monitor protocol messages, `mm_request_send()`/`mm_request_receive()` for privsep monitor traffic, and `fatal_f`/`debug*_f` logging conventions. I found `README.md`/`README`, but no dedicated `CONTRIBUTING`, `HACKING`, `README-hacking`, `docs/`, or `dev-docs/`.

No prior Fixer source patch was present to improve or replace. If later evidence proves a real spin, patch the narrow loop site following existing monitor/packet helpers and avoid awkward control flow such as avoidable `goto`; prefer a bounded local condition or helper-level fix.

## Risks

A speculative source change here could alter sensitive preauth monitor behavior without a proven bug. Adding sleeps, changing `atomicio()`, or modifying monitor fd handling based only on this trace could regress authentication latency or privsep failure handling.

## Validation

Before any future source patch, run the project entrypoint from the workspace root:

`./configure && make`

For a bounded independent reproduction attempt, after building, run a temporary foreground `sshd` on a high localhost port under `timeout`/`strace -f -tt -T` with a generated temporary host key, attempt one invalid login, and check whether `sshd-auth` shows a sustained repeating `read`/`poll`/`nanosleep` loop with measurable CPU. If that does not reproduce sustained spin, keep this as a no-patch diagnosis rather than claiming `reproduced`.

## Patch Pass

Subject: no patch: diagnose sshd-auth busy-poll report

## Commit Message

No source change is proposed. The collected evidence points to a short `sshd-auth` preauth exchange, not a confirmed busy loop: the process was sleeping in a Unix socket read, performed the configured authentication failure delay, wrote a failure response, saw `ECONNRESET`, and exited.

## Evidence Confidence

inferred

## Issue Connection

The collected signal was a Fixer perf/strace report classifying `sshd-auth: unknown [net]` as a likely busy-poll loop, with `_raw_spin_lock` in the kernel profile. The concrete `/proc` and strace evidence does not show a sustained userspace loop: process state was sleeping, `wchan` was `unix_stream_read_generic`, CPU was 0.1%, the first `read(3)` blocked for 1.33s, and the trace ended after a network reset.

The cautious inference is that this was normal OpenSSH preauth behavior rather than an OpenSSH source bug. In this subsystem, fd 3 is the privsep monitor socket and fd 5 is the network socket; `clock_nanosleep` matches OpenSSH’s invalid-authentication delay path. I followed the saved plan and did not leave a speculative source diff.

I checked local style and subsystem helpers before deciding not to patch. OpenSSH uses `atomicio()` for complete fd IO, `sshbuf` for monitor messages, `mm_request_send()`/`mm_request_receive()` for privsep monitor traffic, and `fatal_f`/`debug*_f` logging conventions. I found `README.md`, but no `CONTRIBUTING`, `HACKING`, `README-hacking`, `docs/`, or `dev-docs/` guidance in the requested scan.

The expected effect of this proposal is to avoid an unsafe upstream patch until stronger evidence captures an actual spin or reproducer.

## Git Add Paths

None

## Validation

`./configure && make` from the workspace root failed before build:

`configure: error: ./configure.ac newer than configure, run autoreconf`

I did not run `autoreconf` because this is a no-patch diagnosis and regenerating tracked build files would add unrelated workspace churn.

I attempted a bounded independent localhost reproduction using installed `/usr/sbin/sshd`, `/usr/lib/openssh/sshd-auth`, `ssh`, and `strace` with a temporary host key/config under `/tmp`. It was blocked by sandbox restrictions: `strace` failed with `PTRACE_TRACEME: Operation not permitted` / `ptrace(PTRACE_SEIZE, 9): Operation not permitted`, and the ssh client failed with `socket: Operation not permitted`. Therefore the failure was not independently reproduced.

## Review Pass 1

RESULT: ok

No source changes are present, and that is appropriate for the evidence level. The author classified confidence as `inferred`, listed `Git Add Paths` as `None`, and avoided turning indirect profiler/strace evidence into a speculative OpenSSH source patch.

The maintainer-facing explanation connects the collected signal to the no-patch decision: the trace shows a sleeping `sshd-auth` preauth process, blocking monitor reads, authentication delay, network write, `ECONNRESET`, and exit rather than a sustained busy loop. It also names relevant OpenSSH local conventions (`atomicio()`, `sshbuf`, `mm_request_send()`/`mm_request_receive()`, `fatal_f`/`debug*_f`) and notes the documentation scan result.

Validation is acceptable for a no-patch diagnosis: the project-level `./configure && make` entrypoint was attempted and the exact blocker was reported, and the independent runtime reproduction attempt was described with concrete sandbox blockers.

## Plan Pass

## Problem

Fixer observed an `sshd-auth` preauth process labelled `[net]` with a profiler classification of likely busy-poll, but the concrete artifacts do not show a sustained userspace loop. The strace shows blocking `read(3)` on the monitor fd, expected authentication delay via `clock_nanosleep`, writes to the network fd, then `ECONNRESET` and exit. Kernel stack/wchan also show sleeping in `unix_stream_read_generic`, and sampled CPU was only 0.1%.

## Evidence Confidence

inferred

## Proposed Subject

No source patch yet: diagnose `sshd-auth` busy-poll report as non-actionable without an independently captured loop.

## Patch Plan

Do not edit files in this pass. The evidence is profiler-only/indirect and appears consistent with normal OpenSSH preauth behavior around failed authentication and client disconnect.

Relevant subsystem conventions found: OpenSSH uses `atomicio()` for complete fd reads/writes, `sshbuf` for monitor protocol messages, `mm_request_send()`/`mm_request_receive()` for privsep monitor traffic, and `fatal_f`/`debug*_f` logging conventions. I found `README.md`/`README`, but no dedicated `CONTRIBUTING`, `HACKING`, `README-hacking`, `docs/`, or `dev-docs/`.

No prior Fixer source patch was present to improve or replace. If later evidence proves a real spin, patch the narrow loop site following existing monitor/packet helpers and avoid awkward control flow such as avoidable `goto`; prefer a bounded local condition or helper-level fix.

## Risks

A speculative source change here could alter sensitive preauth monitor behavior without a proven bug. Adding sleeps, changing `atomicio()`, or modifying monitor fd handling based only on this trace could regress authentication latency or privsep failure handling.

## Validation

Before any future source patch, run the project entrypoint from the workspace root:

`./configure && make`

For a bounded independent reproduction attempt, after building, run a temporary foreground `sshd` on a high localhost port under `timeout`/`strace -f -tt -T` with a generated temporary host key, attempt one invalid login, and check whether `sshd-auth` shows a sustained repeating `read`/`poll`/`nanosleep` loop with measurable CPU. If that does not reproduce sustained spin, keep this as a no-patch diagnosis rather than claiming `reproduced`.

## Patch Pass

Subject: no patch: diagnose sshd-auth busy-poll

[truncated]

Issue page: /issues/019e0408-b113-7582-aba2-e5796c8b0d12. Issue JSON: /v1/issues/019e0408-b113-7582-aba2-e5796c8b0d12

postgres is stuck in a likely file not found retry loop: 5.83% of sampled CPU passed through next_uptodate_folio, with repeated read x4620, lseek x2688, close x1428.

Issue page: /issues/019d3a17-b958-7a60-86fd-5304e697f42c. Issue JSON: /v1/issues/019d3a17-b958-7a60-86fd-5304e697f42c

postgres is stuck in a likely file not found retry loop: 5.83% of sampled CPU passed through next_uptodate_folio, with repeated read x4620, lseek x2688, close x1428.

Issue page: /issues/019d3a17-b958-7a60-86fd-5304e697f42c. Issue JSON: /v1/issues/019d3a17-b958-7a60-86fd-5304e697f42c

postgres is stuck in a likely file not found retry loop: 5.83% of sampled CPU passed through next_uptodate_folio, with repeated read x4620, lseek x2688, close x1428.

Issue page: /issues/019d3a17-b958-7a60-86fd-5304e697f42c. Issue JSON: /v1/issues/019d3a17-b958-7a60-86fd-5304e697f42c