Diagnosis-only reports

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__/bisect.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__/dataclasses.cpython-313.pyc, Lib/__pycache__/datetime.cpython-313.pyc, Lib/__pycache__/difflib.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__/pickle.cpython-313.pyc, Lib/__pycache__/pkgutil.cpython-313.pyc, Lib/__pycache__/platform.cpython-313.pyc, Lib/__pycache__/posixpath.cpython-313.pyc, Lib/__pycache__/pprint.cpython-313.pyc, Lib/__pycache__/py_compile.cpython-313.pyc, Lib/__pycache__/random.cpython-313.pyc, Lib/__pycache__/reprlib.cpython-313.pyc, Lib/__pycache__/selectors.cpython-313.pyc, Lib/__pycache__/shlex.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__/tempfile.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__/trace.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/__pycac

[truncated 32102 bytes]

## Plan Pass

## Problem

Fixer observed `/usr/bin/python3 /usr/bin/supervisord -n -c /etc/supervisor/supervisord.conf` with repeated `wait4(-1, WNOHANG) = -1 ECHILD` followed by `poll(..., 1000) = 0`. The sampled process was sleeping in `poll_schedule_timeout`, not spinning inside a CPython runtime loop. The entrypoint is the Supervisor application; the CPython source tree contains only the interpreter and stdlib, not Supervisor.

## Evidence Confidence

observed

## Proposed Subject

No CPython source patch: diagnose Fixer 90021 as an application-level Supervisor event-loop/reaper pattern, not a demonstrated `python3.13` runtime defect.

## Patch Plan

- Do not edit CPython unless new evidence links the loop to CPython’s `os.wait4`, `select.poll`, `subprocess`, or `asyncio` behavior.
- Document that the raw artifact paths in `evidence.json` are unavailable here, so the plan relies on the JSON excerpts.
- Explain that CPython’s relevant local code already follows maintainer conventions:
  - `Modules/posixmodule.c::os_wait4_impl()` wraps `wait4()` with `Py_BEGIN_ALLOW_THREADS`, EINTR retry, `PyErr_CheckSignals()`, and `wait_helper()`.
  - `Modules/selectmodule.c` handles `poll()` timeout conversion with `_PyDeadline_Init()` / `_PyDeadline_Get()` and EINTR retry.
  - `Lib/subprocess.py` handles child polling with `_waitpid_lock` and treats `ECHILD` as a known child-management condition.
- Note no prior Fixer patch or Debian patch for `90021`, `supervisord`, or this runaway-process signal was found in the workspace.
- If later evidence shows a real CPython defect, prefer a small, direct change in the implicated helper path and avoid awkward control flow such as avoidable `goto`; at present, no such source patch is justified.

## Risks

A CPython patch based only on this evidence would likely mask an application or service configuration issue and risk changing stable POSIX process semantics. The profiler classification says “busy-poll,” but the syscall timings show one-second blocking `poll()` calls, so presenting this as a confirmed interpreter CPU bug would overstate the evidence.

## Validation

Before any future source patch report, 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 failure and then use the narrowest relevant checks, likely:

```sh
./python -m test test_wait4 test_poll test_selectors test_subprocess
```

For a bounded independent check of the collected signal, only if Supervisor is safely available with a no-program temporary config, run it under `timeout`/`strace` to see whether the same `wait4(-1, WNOHANG)` plus one-second `poll()` cadence is produced by Supervisor itself. Do not claim `reproduced` unless that exact entrypoint or safe temp-config run shows the failure signal.

## Patch Pass

Subject: No patch: diagnose Supervisor wait/poll trace

## Commit Message

No CPython source change is proposed. The collected signal shows a Python process running the Supervisor application, sleeping in a one-second `poll()` timeout after `wait4(-1, WNOHANG)` reports no children. That pattern is an application event-loop/reaper cadence, not enough evidence of a CPython `wait4()` or `poll()` runtime defect.

## Evidence Confidence

observed

## Issue Connection

Fixer observed `/usr/bin/python3 /usr/bin/supervisord -n -c /etc/supervisor/supervisord.conf` with 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`. `WNOHANG` means “check for exited children without blocking”; `ECHILD` means there are no child processes to reap.

The cautious code-level inference is that Supervisor is periodically checking child status and then blocking in its own event loop for about one second. CPython’s relevant local wrappers already follow the expected conventions: `os.wait4()` uses `Py_BEGIN_ALLOW_THREADS`, EINTR retry, `PyErr_CheckSignals()`, and `wait_helper()`, while `select.poll()` uses `_PyDeadline_Init()` / `_PyDeadline_Get()` for timeout handling and EINTR retry. I also checked `Lib/subprocess.py`, which uses `_waitpid_lock` around child polling.

No source change was made because the evidence does not connect the observed loop to a CPython runtime bug. This follows the saved plan; I did not change course. The expected effect is avoiding an upstream CPython patch that would be speculative and could alter stable POSIX process behavior without a reproduced interpreter defect.

## Git Add Paths

None

## Validation

Ran project-level build entrypoint from the workspace root:

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

Result: exit status 0. The build reported optional module issues: `_ssl` built but failed import with undefined symbol `TLSv1_method`; `_dbm`, `_gdbm`, and `_tkinter` were missing.

Focused checks:

```sh
./python -m test test_wait4 test_poll test_subprocess
```

Result: `test_wait4` and `test_poll` passed; `test_subprocess` failed. Verbose rerun showed 8 errors limited to `test_group` and `test_user`, each raising `OSError: [Errno 22] Invalid argument` during uid/gid switching, unrelated to the observed wait/poll signal.

Independent reproduction attempt:

```sh
command -v supervisord
test -x /usr/bin/supervisord
```

Blocked: `supervisord not found on PATH`; `/usr/bin/supervisord not executable`. I did not reproduce the collected Supervisor trace locally.

## 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__/bisect.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__/dataclasses.cpython-313.pyc`, `Lib/__pycache__/datetime.cpython-313.pyc`, `Lib/__pycache__/difflib.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__/pickle.cpython-313.pyc`, `Lib/__pycache__/pkgutil.cpython-313.pyc`, `Lib/__pycache__/platform.cpython-313.pyc`, `Lib/__pycache__/posixpath.cpython-313.pyc`, `Lib/__pycache__/pprint.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__/bisect.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__/dataclasses.cpython-313.pyc`, `Lib/__pycache__/datetime.cpython-313.pyc`, `Lib/__pycache__/difflib.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 Supervisor diagnosis artifact-free

## Commit Message

No CPython source change is proposed. The review found generated build and test artifacts in the workspace while the proposal intentionally listed no patch paths, so I removed those artifacts and kept the no-patch diagnosis.

## Evidence Confidence

observed

## Issue Connection

Fixer observed `/usr/bin/python3 /usr/bin/supervisord -n -c /etc/supervisor/supervisord.conf` repeatedly calling `wait4(-1, WNOHANG)` and receiving `ECHILD`, then blocking in `poll(..., 1000)`. `WNOHANG` means the process is checking for exited children without blocking; `ECHILD` means there are no children to reap. `/proc` also showed the sampled process sleeping in `poll_schedule_timeout`.

The cautious inference remains that this is Supervisor’s application-level event loop or child reaper cadence, not a demonstrated CPython runtime bug. I rechecked CPython’s relevant local conventions: `Modules/posixmodule.c` wraps `wait4()` with `Py_BEGIN_ALLOW_THREADS`, EINTR retry, `PyErr_CheckSignals()`, and `wait_helper()`, while `Modules/selectmodule.c` handles `poll()` timeout and EINTR behavior through the existing deadline helpers. I also rechecked contribution/style entry points including `README.rst`; no new helper or API is introduced.

The specific refinement was to address the review finding by removing generated b

[truncated 2243 bytes]

## Plan Pass

## Problem

Fixer observed `/usr/bin/python3 /usr/bin/supervisord -n -c /etc/supervisor/supervisord.conf` with repeated `wait4(-1, WNOHANG) = -1 ECHILD` followed by `poll(..., 1000) = 0`. The sampled process was sleeping in `poll_schedule_timeout`, not spinning inside a CPython runtime loop. The entrypoint is the Supervisor application; the CPython source tree contains only the interpreter and stdlib, not Supervisor.

## Evidence Confidence

observed

## Proposed Subject

No CPython source patch: diagnose Fixer 90021 as an application-level Supervisor event-loop/reaper pattern, not a demonstrated `python3.13` runtime defect.

## Patch Plan

- Do not edit CPython unless new evidence links the loop to CPython’s `os.wait4`, `select.poll`, `subprocess`, or `asyncio` behavior.
- Document that the raw artifact paths in `evidence.json` are unavailable here, so the plan relies on the JSON excerpts.
- Explain that CPython’s relevant local code already follows maintainer conventions:
  - `Modules/posixmodule.c::os_wait4_impl()` wraps `wait4()` with `Py_BEGIN_ALLOW_THREADS`, EINTR retry, `PyErr_CheckSignals()`, and `wait_helper()`.
  - `Modules/selectmodule.c` handles `poll()` timeout conversion with `_PyDeadline_Init()` / `_PyDeadline_Get()` and EINTR retry.
  - `Lib/subprocess.py` handles child polling with `_waitpid_lock` and treats `ECHILD` as a known child-management condition.
- Note no prior Fixer patch or Debian patch for `90021`, `supervisord`, or this runaway-process signal was found in the workspace.
- If later evidence shows a real CPython defect, prefer a small, direct change in the implicated helper path and avoid awkward control flow such as avoidable `goto`; at present, no such source patch is justified.

## Risks

A CPython patch based only on this evidence would likely mask an application or service configuration issue and risk changing stable POSIX process semantics. The profiler classification says “busy-poll,” but the syscall timings show one-second blocking `poll()` calls, so presenting this as a confirmed interpreter CPU bug would overstate the evidence.

## Validation

Before any future source patch report, 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 failure and then use the narrowest relevant checks,

[truncated]

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

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` (`/usr/sbin/dockerd -H fd:// --containerd=...`) in `S` sleeping state with many futex waits, low CPU (`0.1%`), and a kernel hot path `mem_cgroup_handle_over_high`. The bundle’s own implicated package is `linux-image-6.17.10+deb14-amd64`, not `docker.io`. The source-level connection to Moby daemon code is not established.

## Evidence Confidence
inferred

## Proposed Subject
No source patch: require richer dockerd runtime evidence before changing Moby

## Patch Plan
Do not edit source in this pass. The available evidence is profiler/process-state only, raw artifact paths are unavailable in this workspace, and the excerpt does not identify a Moby function, goroutine, API path, listener loop, or containerd interaction causing churn.

Before any future patch, collect extra evidence: full `strace`, fd targets, symbolic Go goroutine dump or pprof, daemon debug logs, `docker info`, and container/memcg pressure context. Start from the `dockerd` entrypoint (`engine/cmd/dockerd`) and only investigate runtime/containerd second unless the new evidence points there.

Follow Moby conventions from `engine/CONTRIBUTING.md` and `engine/docs/contributing/test.md`: put daemon changes under `engine/cmd/dockerd`, `engine/daemon`, or integration tests as appropriate; use existing helpers such as `log.G(ctx)`, `daemon/listeners.Init`, `pidfile`, and `homedir.StickRuntimeDirContents`; run `gofmt -s`. No relevant local helper was found that directly addresses the observed futex/memcg signal. Existing Debian patches appear packaging/build/test related; no prior Fixer patch was found to improve or replace.

Avoid speculative control-flow changes, including awkward `goto`-style retry throttles, because the evidence does not prove a retry loop or socket churn in Moby source.

## Risks
A source patch would likely be non-upstreamable because it would optimize or throttle an unproven path. The reported signal may be normal idle goroutines, kernel memory-cgroup reclaim behavior, systemd socket activation state, container workload pressure, or containerd/runtime activity outside Moby.

## Validation
If later evidence justifies a patch, first run the project entrypoint from the workspace root: `cd engine && make test-unit` or a narrowed documented form such as `cd engine && TESTDIRS='github.com/docker/docker/cmd/dockerd github.com/docker/docker/daemon/listeners' make test-unit`.

For an independent bounded reproduction attempt, run a locally built `dockerd` only with a temporary root/exec-root and a private Unix socket under `timeout`, then sample `strace -f -c` and goroutine/pprof output. Do not claim reproduction unless that command shows the same futex/memcg or socket-churn signal.

## Patch Pass

Subject: No patch: report inconclusive dockerd futex profile

## Commit Message
No source change is proposed. The collected signal points more strongly at a sleeping `dockerd` under kernel memory-cgroup pressure than at a Moby daemon code path, so a patch would be speculative without a symbolic goroutine trace, full strace, fd targets, or daemon logs.

## Evidence Confidence
inferred

## Issue Connection
Fixer collected a `dockerd` process running as `/usr/sbin/dockerd -H fd:// --containerd=/run/containerd/containerd.sock` in `S (sleeping)` state with many `futex` waits. A futex is the kernel wait primitive Go uses when goroutines are parked. The perf hotspot was `mem_cgroup_handle_over_high`, and the evidence bundle itself lists `linux-image-6.17.10+deb14-amd64` as the implicated package.

The cautious inference is that the sampled daemon was mostly idle or blocked while the kernel handled memory-cgroup pressure, not that Moby was spinning in a user-space retry loop. I inspected the daemon entrypoint and `fd://` listener path; it uses existing Moby helpers and conventions such as `log.G(ctx)`, `daemon/listeners.Init`, `pidfile`, `homedir.StickRuntimeDirContents`, and `go-systemd` socket activation helpers. I did not find a loop or local control-flow bug matching the collected futex evidence.

I followed the saved plan and left no source diff. The expected effect is to avoid an upstream-unready patch and leave a focused diagnosis for human follow-up: collect full strace/fd targets, Go goroutine or pprof output, daemon debug logs, `docker info`, and memory-cgroup pressure context before changing Moby source. No relevant local helper was found that directly addresses the observed futex/memcg signal.

## Git Add Paths
None

## Validation
Read `engine/CONTRIBUTING.md` and `engine/docs/contributing/test.md`; Moby expects daemon changes under `engine/cmd/dockerd` or `engine/daemon`, `gofmt -s`, and `make test-unit`/documented test targets.

Attempted documented workspace-root validation:
`timeout 60s sh -c "cd engine && TESTDIRS='github.com/docker/docker/cmd/dockerd' TESTFLAGS='-run ^TestLoadListenerNoAddr$' make test-unit"`
Blocked by the environment: `ERROR: mkdir /root/.docker: read-only file system`.

Fallback focused check:
`timeout 120s sh -c "cd engine && go test ./cmd/dockerd -run '^TestLoadListenerNoAddr$'"`
Blocked by missing module resolution in this Debian source workspace (`cannot find module providing package ... import lookup disabled by -mod=readonly`) and missing Go cache env (`GOCACHE is not defined...`).

Independent reproduction attempt was blocked. The raw dockerd investigation directory named in `evidence.json` does not exist, `pgrep -a dockerd` found no visible local daemon process to sample, and `docker version --format '{{.Server.Version}}'` failed with `connect: operation not permitted` against `/var/run/docker.sock`.

`git status --short` is clean; no source changes were left.

## Review Pass 1

RESULT: ok

No source diff is present, and that matches the evidence level. The author correctly classified the confidence as `inferred`, avoided a speculative source patch, and explained that the perf/strace evidence does not establish a Moby code path as the cause.

The response includes the required sections, names the relevant Moby conventions/helpers inspected (`log.G(ctx)`, `daemon/listeners.Init`, `pidfile`, `homedir.StickRuntimeDirContents`, go-systemd activation), reports a project-level validation attempt with the exact blocker, and documents the blocked independent reproduction attempt. `git status` is clean.

## Plan Pass

## Problem
Fixer observed `dockerd` (`/usr/sbin/dockerd -H fd:// --containerd=...`) in `S` sleeping state with many futex waits, low CPU (`0.1%`), and a kernel hot path `mem_cgroup_handle_over_high`. The bundle’s own implicated package is `linux-image-6.17.10+deb14-amd64`, not `docker.io`. The source-level connection to Moby daemon code is not established.

## Evidence Confidence
inferred

## Proposed Subject
No source patch: require richer dockerd runtime evidence before changing Moby

## Patch Plan
Do not edit source in this pass. The available evidence is profiler/process-state only, raw artifact paths are unavailable in this workspace, and the excerpt does not identify a Moby function, goroutine, API path, listener loop, or containerd interaction causing churn.

Before any future patch, collect extra evidence: full `strace`, fd targets, symbolic Go goroutine dump or pprof, daemon debug logs, `docker info`, and container/memcg pressure context. Start from the `dockerd` entrypoint (`engine/cmd/dockerd`) and only investigate runtime/containerd second unless the new evidence points there.

Follow Moby conventions from `engine/CONTRIBUTING.md` and `engine/docs/contributing/test.md`: put daemon changes under `engine/cmd/dockerd`, `engine/daemon`, or integration tests as appropriate; use existing helpers such as `log.G(ctx)`, `daemon/listeners.Init`, `pidfile`, and `homedir.StickRuntimeDirContents`; run `gofmt -s`. No relevant local helper was found that directly addresses the observed futex/memcg signal. Existing Debian patches appear packaging/build/test related; no prior Fixer patch was found to improve or replace.

Avoid speculative control-flow changes, including awkward `goto`-style retry throttles, because the evidence does not prove a retry loop or socket churn in Moby source.

## Risks
A source patch would likely be non-upstreamable because it would optimize or throttle an unproven path. The reported signal may be normal idle goroutines, kernel memory-cgroup reclaim behavior, systemd socket activation state, container workload pressure, or containerd/runtime activity outside Moby.

## Validation
If later evidence justifies a patch, first run the project entrypoint from the workspace root: `cd engine && make test-unit` or a narrowed documented form such as `cd engine && TESTDIRS='github.com/docker/docker/cmd/dockerd github.com/docker/doc

[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: 100.00% of sampled CPU passed through unresolved offset, 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 observed `/usr/bin/python3 /usr/bin/supervisord -n -c /etc/supervisor/supervisord.conf` with repeated `wait4(-1, ..., WNOHANG) = -1 ECHILD` followed by `poll(..., 1000) = 0`. That pattern looks like the `supervisord` event loop checking for children once per second, not a tight CPython runtime loop. The process state was sleeping and `wchan` was `poll_schedule_timeout.constprop.0`; the unresolved `pthread_attr_destroy` frame is not enough to identify a CPython defect.

## Evidence Confidence
observed

## Proposed Subject
No CPython source patch in this pass. Treat this as an upstream-style no-patch diagnosis unless an independent reproduction shows CPython itself spinning or mishandling `waitpid`/`poll`.

## Patch Plan
1. Do not edit CPython based only on the profiler signal.
2. Document that the application entrypoint is `supervisord`, while CPython is only the interpreter process.
3. If later evidence proves a runtime bug, investigate `Modules/posixmodule.c` and `Modules/selectmodule.c`; relevant local conventions/helpers are `Py_BEGIN_ALLOW_THREADS` / `Py_END_ALLOW_THREADS`, `PyErr_CheckSignals()`, `posix_error()`, `wait_helper()`, and `_PyDeadline_*` timeout handling.
4. No prior Fixer patch is present in this workspace (`git status --short` is clean), so there is nothing to improve or replace.
5. No awkward control-flow change, including avoidable `goto`, should be introduced; current wait/poll wrappers are bounded direct syscall wrappers.

## Risks
A source patch here would likely be speculative and could alter stable `os.waitpid`, `select.poll`, or subprocess semantics without a demonstrated CPython bug. The evidence may be a supervisor configuration/workload issue, or a profiler misclassification of a sleeping once-per-second service loop as runaway CPU.

## Validation
Before reporting only a focused check after any future edit, try the project-level entrypoint from the workspace root: `./configure && make`. If it fails due to missing dependencies or generated files, record the exact failure and then run the narrowest relevant compile/test.

For the independent bounded check, try to reproduce the collected signal at the application entrypoint if available: `timeout 6s strace -f -tt -e poll,wait4,waitpid /usr/bin/python3 /usr/bin/supervisord -n -c /etc/supervisor/supervisord.conf`. In this workspace `/usr/bin/supervisord` and the raw investigation files are unavailable, so do not claim reproduced unless that command can actually be run and shows the same behavior. A secondary CPython sanity check can confirm `os.waitpid(-1, os.WNOHANG)` raises `ChildProcessError`/`ECHILD` without a runtime loop.

## Patch Pass

Subject: No patch: diagnose supervisord poll trace

## Commit Message
No source change. The collected evidence points to a `supervisord` event loop running under CPython, not to a demonstrated CPython wait or poll bug. CPython’s local wait/poll wrappers already use the expected syscall conventions and signal-handling helpers.

## Evidence Confidence
inferred

## Issue Connection
Fixer collected a perf/strace `/proc` signal for `/usr/bin/python3 /usr/bin/supervisord -n -c /etc/supervisor/supervisord.conf`: repeated `wait4(-1, ..., WNOHANG) = -1 ECHILD` followed by `poll(..., 1000) = 0`, with `/proc` showing the process sleeping in `poll_schedule_timeout.constprop.0`.

The cautious code-level inference is that this is `supervisord` waking once per second to check for child processes, not a tight CPython busy loop. The CPython wait wrappers in `Modules/posixmodule.c` use `Py_BEGIN_ALLOW_THREADS`, `Py_END_ALLOW_THREADS`, `PyErr_CheckSignals()`, `posix_error()`, and `wait_helper()`. The poll wrapper in `Modules/selectmodule.c` uses `_PyDeadline_*` timeout handling and signal retry logic. `Lib/subprocess.py` also protects waitpid calls with `_waitpid_lock`. No relevant local helper was missing.

I followed the saved plan and made no source change because the evidence is not pull-request-ready for a CPython runtime patch. The expected effect is to avoid an upstream patch that would change stable wait/poll semantics without a reproduced CPython defect.

## Git Add Paths
None

## Validation
`./configure && make` from the workspace root completed with exit code 0. The build reported optional module issues: `_dbm`, `_gdbm`, and `_tkinter` missing, and `_ssl` was built then removed because importing it failed with `undefined symbol: TLSv1_method`.

Independent reproduction attempt: `timeout 6s strace -f -tt -e poll,wait4,waitpid /usr/bin/python3 /usr/bin/supervisord -n -c /etc/supervisor/supervisord.conf` did not reproduce; it was blocked by ptrace restrictions: `PTRACE_TRACEME: Operation not permitted` and `ptrace(PTRACE_SEIZE, 5): Operation not permitted`. `/usr/bin/supervisord` is also absent in this workspace.

Focused CPython sanity check: `./python` running `os.waitpid(-1, os.WNOHANG)` returned `ChildProcessError` errno `10` in about `0.000004s`, with no loop. `git diff --name-only` is empty; no tracked source files were changed.

## 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.
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 patch: keep supervisord diagnosis clean

## Commit Message
No source change. The review found that the previous validation run left generated build and bytecode artifacts in the workspace. I removed those artifacts so the no-patch diagnosis is represented by an empty source diff.

## Evidence Confidence
inferred

## Issue Connection
Fixer collected a perf/strace `/proc` signal for `/usr/bin/python3 /usr/bin/supervisord -n -c /etc/supervisor/supervisord.conf`: repeated `wait4(-1, ..., WNOHANG) = -1 ECHILD` followed by `poll(..., 1000) = 0`, while `/proc` showed the process sleeping in `poll_schedule_timeout.constprop.0`.

The cautious inference is unchanged: this looks like `supervisord` waking once per second to check child processes, not a demonstrated CPython runtime defect. I rechecked the local conventions in the relevant CPython wrappers: `Modules/posixmodule.c` uses `Py_BEGIN_ALLOW_THREADS`, `Py_END_ALLOW_THREADS`, `PyErr_CheckSignals()`, `posix_error()`, and `wait_helper()`, while `Modules/selectmodule.c` uses `_PyDeadline_*` timeout handling. I also checked project guidance; `README.rst` points contributors to the CPython Developer Guide, and no repo-root `CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, or `dev-docs/` guidance was present.

The specific refinement change was cleanup only: I removed the generated build outputs and `__pycache__` files left by validation, addressing the review’s metadata-drift finding. The expected effect is that the final proposal remains a no-patch diagnosis with no generated artifacts or source files staged for an upstream CPython patch.

## Git Add Paths
None

## Validation
Review finding addressed with `make distclean`, then verified cleanup with `git status --short` and `git diff --name-status`; both produced no output.

I did not rerun `./configure && make` after cleanup because no source files changed in this refinement and rerunning it would recreate the generated artifacts the review asked to remove. The prior project-level validation in this workspace was `./configure && make`, which completed with exit code 0 but reported optional module issues: `_dbm`, `_gdbm`, and `_tkinter` missing, and `_ssl` removed after import failed with `undefined symbol: TLSv1_method`.

The prior bounded reproduction attempt, `timeout 6s strace -f -tt -e poll,wait4,waitpid /usr/bin/python3 /usr/bin/supervisord -n -c /etc/supervisor/supervisord.conf`, did not reproduce because ptrace was blocked with `Operation not permitted`; `/usr/bin/supervisord` was also absent in this workspace.

## Review Pass 2

RESULT: ok

Workspace is clean after refinement: `git status --short`, `git diff --stat`, and `git diff --name-status` produce no output. The response now matches `## Git Add Paths: None`.

The no-patch diagnosis is appropriate for the evidence level. The author does not leave a speculative CPython source diff from indirect profiler/strace evidence, keeps `## Evidence Confidence` valid as `inferred`, and explains the likely `supervisord` event-loop interpretation without inventing a reproducer.

Validation is acceptable for a no-source-change cleanup refinement: the earlier project-level `./configure && make` result is reported, the ptrace blocker for the bounded reproduction attempt is named, and the cleanup itself was verified without regenerating build artifacts.

## Plan Pass

## Problem
Fixer observed `/usr/bin/python3 /usr/bin/supervisord -n -c /etc/supervisor/supervisord.conf` with repeated `wait4(-1, ..., WNOHANG) = -1 ECHILD` followed by `poll(..., 1000) = 0`. That pattern looks like the `supervisord` event loop checking for children once per second, not a tight CPython runtime loop. The process state was sleeping and `wchan` was `poll_schedule_timeout.constprop.0`; the unresolved `pthread_attr_destroy` frame is not enough to identify a CPython defect.

## Evidence Confidence
observed

## Proposed Subject
No CPython source patch in this pass. Treat this as an upstream-style no-patch diagnosis unless an independent reproduction shows CPython itself spinning or mishandling `waitpid`/`poll`.

## Patch Plan
1. Do not edit CPython based only on the profiler signal.
2. Document that the application entrypoint is `supervisord`, while CPython is only the interpreter process.
3. If later evidence proves a runtime bug, investigate `Modules/posixmodule.c` and `Modules/selectmodule.c`; relevant local conventions/helpers are `Py_BEGIN_ALLOW_THREADS` / `Py_END_ALLOW_THREADS`, `PyErr_CheckSignals()`, `posix_error()`, `wait_helper()`, and `_PyDeadline_*` timeout handling.
4. No prior Fixer patch is present in this workspace (`git status --short` is clean), so there is nothing to improve or replace.
5. No awkward control-flow change, including avoidable `goto`, should be introduced; current wait/poll wrappers are bounded direct syscall wrappers.

## Risks
A source patch here would likely be speculative and could alter stable `os.waitpid`, `select.poll`, or subprocess semantics without a demonstrated CPython bug. The evidence may be a supervisor configuration/workload issue, or a profiler misclassification of a sleeping once-per-second service loop as runaway CPU.

## Validation
Before reporting only a focused check after any future edit, try the project-level entrypoint from the workspace root: `./configure && make`. If it fails due to missing dependencies or generated files, record the exact failure and then run the narrowest relevant compile/test.

For the independent bounded check, try to reproduce the collected signal at the application entrypoint if available: `timeout 6s strace -f -tt -e poll,wait4,waitpid /usr/bin/python3 /usr/bin/supervisord -n -c /etc/supervisor/supervisord.conf`. In this workspace `/usr/bin/supervisord

[truncated]

Issue page: /issues/019dc2a0-9ae7-7f42-8f59-415fe22abe51. Issue JSON: /v1/issues/019dc2a0-9ae7-7f42-8f59-415fe22abe51

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 observed high CPU attributed to `/usr/bin/python3.13`, but the command line is `/usr/bin/python3 /usr/bin/supervisord -n -c /etc/supervisor/supervisord.conf`. The captured syscall evidence shows `wait4(-1, ..., WNOHANG) = ECHILD` followed by `poll(..., 1000)` timing out after about one second, and `/proc` state is sleeping in `poll_schedule_timeout`. That is not enough to identify a CPython runtime defect, and the application entrypoint `supervisord` is not in this CPython source tree.

## Evidence Confidence
observed

## Proposed Subject
No CPython source patch in this pass. Proposed maintainer-facing subject: `No patch: supervisord poll/wait loop evidence does not isolate a CPython bug`.

## Patch Plan
Do not edit CPython unless extra evidence shows the interpreter is causing the loop independently of `supervisord`.

Use the observed evidence as a diagnosis/report: Fixer saw a Python-hosted `supervisord` process with profiler samples in `_PyEval_EvalFrameDefault` and an unreliable-looking native backtrace frame near `pthread_attr_destroy`, but the concrete syscall trace is an application-level one-second event loop, not a tight runtime spin.

Contribution/style scan found CPython’s `README.rst`, which points contributors to the Developer Guide and documents `./configure`, `make`, and `make test`; `Doc/using/configure.rst` documents `make test` using regrtest `--fast-ci`. Relevant local conventions/helpers include `Py_BEGIN_ALLOW_THREADS` around blocking `poll()`/`waitpid()`, `_PyDeadline_*` timeout recomputation in `Modules/selectmodule.c`, `posix_error()` in `Modules/posixmodule.c`, `PyMem_RawMalloc/Free` in thread startup code, and `subprocess.Popen._waitpid_lock` around `waitpid`. No relevant local helper was found that maps the evidence to a CPython-owned fix.

No prior Fixer patch was present in the workspace (`git status --short` is clean). If later evidence proves a CPython defect, the patch should improve the existing bounded control flow in the affected helper and avoid adding awkward `goto`-style exits where a direct cleanup/return path is clearer.

## Risks
A CPython patch based only on this evidence would likely be speculative and could change runtime, subprocess, signal, or polling behavior without a demonstrated interpreter bug. The observed `wait4`/`poll` sequence may be normal supervisor idle behavior, and the high CPU attribution may belong to another process, sampling artifact, kernel accounting, or the `supervisord` package/configuration.

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

`./configure && make`

If that fails because build dependencies or generated files are missing, record the exact command and failure reason, then run the narrowest relevant build such as compiling only the touched CPython file or running the relevant stdlib test.

For a bounded independent reproduction attempt, after a successful build run a short `strace` against the built `./python` that mimics only the collected signal: `os.waitpid(-1, os.WNOHANG)` handling `ChildProcessError`, then `select.poll().poll(1000)` on an idle fd. This can confirm whether CPython’s wrappers block for the requested timeout rather than spinning, but it should not be reported as reproducing the `supervisord` issue unless it actually shows the same high-CPU failure.

## Patch Pass

Subject: No patch: supervisord poll loop does not isolate CPython bug

## Commit Message
No source change is proposed.

The likely root cause from the collected evidence is an application-level supervisor loop: `supervisord` calls `wait4(..., WNOHANG)`, finds no children, then blocks in `poll(..., 1000)` for about one second. `/proc` also shows the process sleeping in the kernel poll wait path. That does not identify a CPython runtime busy loop.

## Evidence Confidence
inferred

## Issue Connection
Fixer collected perf, strace, and `/proc` evidence for `/usr/bin/python3.13` running `/usr/bin/supervisord -n -c /etc/supervisor/supervisord.conf`. The exact collected signal was repeated `wait4(-1, ..., WNOHANG) = ECHILD` followed by `poll(..., 1000)` timing out after about one second, with the process state sleeping in `poll_schedule_timeout`.

The cautious inference is that the visible loop belongs to `supervisord`’s event loop, not to CPython’s `select.poll()` or `os.waitpid()` wrappers. Nearby CPython code already uses the expected local patterns: `Py_BEGIN_ALLOW_THREADS` around blocking syscalls, `_PyDeadline_*` timeout recomputation in `Modules/selectmodule.c`, `posix_error()` in `Modules/posixmodule.c`, `PyMem_RawMalloc/Free` in pthread setup, and `subprocess.Popen._waitpid_lock` around `waitpid`.

I followed the saved plan’s no-patch direction. The only course adjustment is classifying this final result as `inferred`, because the final instructions treat profiler/strace evidence that does not isolate a target-repo code cause as indirect. The expected effect of leaving no source diff is to avoid a speculative CPython behavior change and provide a report that is suitable for investigating `supervisord`, its configuration, or process attribution instead.

## Git Add Paths
None

## Validation
`./configure && make` from the workspace root completed with exit status 0. The build reported optional module issues: `_dbm`, `_gdbm`, and `_tkinter` missing, and `_ssl` built but failed import with `undefined symbol: TLSv1_method`.

Independent reproduction attempt with `strace -f -tt -e trace=poll,wait4 ./python ...` was blocked by sandbox ptrace permissions: `PTRACE_TRACEME: Operation not permitted`.

Fallback smoke check: `/usr/bin/time -f 'elapsed=%e cpu=%P' ./python ...` exercising `os.waitpid(-1, os.WNOHANG)` plus `select.poll().poll(1000)` returned `poll_result=[] elapsed=1.001` and `cpu=0%`, so it did not reproduce the high-CPU failure.

Focused checks passed:
`./python -m test -v test_select`
`./python -m unittest -v test.test_subprocess.ProcessTestCase.test_poll test.test_subprocess.ProcessTestCase.test_wait test.test_subprocess.ProcessTestCase.test_wait_timeout test.test_subprocess.ProcessTestCase.test_threadsafe_wait`

Cleaned validation artifacts with `make distclean`; `git status --short` is clean.

## Review Pass 1

RESULT: ok

No source diff is present, and `git status --short` is clean. The no-patch diagnosis is appropriate for the evidence: the collected trace shows `supervisord` sleeping in one-second `poll()` calls between `wait4(WNOHANG)` checks, which does not isolate a CPython runtime defect.

The author included the required `## Evidence Confidence` section with an allowed value, avoided claiming reproduction, documented the blocked `strace` attempt, tried the project-level `./configure && make` entrypoint, and named relevant CPython local patterns/helpers (`Py_BEGIN_ALLOW_THREADS`, `_PyDeadline_*`, `posix_error()`, `PyMem_Raw*`, `_waitpid_lock`). No correctness or maintainer-experience issues found.

## Plan Pass

## Problem
Fixer observed high CPU attributed to `/usr/bin/python3.13`, but the command line is `/usr/bin/python3 /usr/bin/supervisord -n -c /etc/supervisor/supervisord.conf`. The captured syscall evidence shows `wait4(-1, ..., WNOHANG) = ECHILD` followed by `poll(..., 1000)` timing out after about one second, and `/proc` state is sleeping in `poll_schedule_timeout`. That is not enough to identify a CPython runtime defect, and the application entrypoint `supervisord` is not in this CPython source tree.

## Evidence Confidence
observed

## Proposed Subject
No CPython source patch in this pass. Proposed maintainer-facing subject: `No patch: supervisord poll/wait loop evidence does not isolate a CPython bug`.

## Patch Plan
Do not edit CPython unless extra evidence shows the interpreter is causing the loop independently of `supervisord`.

Use the observed evidence as a diagnosis/report: Fixer saw a Python-hosted `supervisord` process with profiler samples in `_PyEval_EvalFrameDefault` and an unreliable-looking native backtrace frame near `pthread_attr_destroy`, but the concrete syscall trace is an application-level one-second event loop, not a tight runtime spin.

Contribution/style scan found CPython’s `README.rst`, which points contributors to the Developer Guide and documents `./configure`, `make`, and `make test`; `Doc/using/configure.rst` documents `make test` using regrtest `--fast-ci`. Relevant local conventions/helpers include `Py_BEGIN_ALLOW_THREADS` around blocking `poll()`/`waitpid()`, `_PyDeadline_*` timeout recomputation in `Modules/selectmodule.c`, `posix_error()` in `Modules/posixmodule.c`, `PyMem_RawMalloc/Free` in thread startup code, and `subprocess.Popen._waitpid_lock` around `waitpid`. No relevant local helper was found that maps the evidence to a CPython-owned fix.

No prior Fixer patch was present in the workspace (`git status --short` is clean). If later evidence proves a CPython defect, the patch should improve the existing bounded control flow in the affected helper and avoid adding awkward `goto`-style exits where a direct cleanup/return path is clearer.

## Risks
A CPython patch based only on this evidence would likely be speculative and could change runtime, subprocess, signal, or polling behavior without a demonstrated interpreter bug. The observed `wait4`/`poll` sequence may be normal supervisor idle behavior, and t

[truncated]

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

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: 15.39% of sampled CPU passed through __memcg_slab_free_hook, with repeated thread backtraces show 1 thread(s) around 0x00007f263f69a7d2 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: 100.00% of sampled CPU passed through kmem_cache_free, 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 `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

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. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final 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 a 3-second perf profile attributing the sampled hot path to kernel `bpf_lsm_file_permission`, while the process itself was sleeping with about `0.1%` CPU. Embedded `strace` and stack excerpts are dominated by `futex` waits, not a confirmed tight userspace loop. The raw artifact files referenced by the bundle are not present in the workspace, and the stripped backtrace does not map to Go symbols.

## Evidence Confidence
inferred

## Proposed Subject
No source patch yet: diagnose the `dockerd` profiler signal as insufficient for an upstream Moby change until an independent low-cost signal ties `bpf_lsm_file_permission` activity to a specific daemon code path.

## Patch Plan
1. Do not edit files on the current evidence alone. The evidence is profiler-only/indirect, low-CPU, kernel-attributed, and does not identify a Docker source function.
2. Improve or replace any prior Fixer attempt that treats this as confirmed socket churn; the embedded `strace` excerpts show `futex`/`waitid`, and the raw strace is unavailable.
3. If more evidence is collected, start from the `dockerd` entrypoint in `engine/cmd/dockerd/docker.go` and daemon setup in `engine/cmd/dockerd/daemon.go`, only then inspect runtime/containerd paths if the new evidence points there.
4. Follow Moby conventions from `engine/CONTRIBUTING.md` and `engine/TESTING.md`: Go changes under `cmd/dockerd` or `daemon`, unit tests for bug fixes, `gofmt -s -w`, and clear maintainer-facing commit text.
5. Prefer local conventions/helpers if a patch becomes justified: `log.G(ctx)` for logging, `daemon/internal/filedescriptors.GetTotalUsedFds` for daemon FD counting, `engine/pkg/system` compatibility helpers where applicable, and existing Cobra/config patterns in `cmd/dockerd`. Reject awkward control flow such as avoidable `goto`; use bounded helper functions or early returns.

## Risks
A source patch from this evidence would likely be speculative. The observed hot symbol is in the kernel LSM path, the sampled package list implicates the kernel image, CPU use is low, and no daemon API request, file path, fd target, or Go symbol is available to connect the cost to Moby code.

## Validation
If later evidence supports a source change, first try the reproducible project entrypoint from the workspace root: `cd engine && make test-unit TESTDIRS=./cmd/dockerd ./daemon`. Then run the focused package test for any touched package.

Bounded independent reproduction attempt before editing: run a local `dockerd` smoke/profile only if safe in the environment, e.g. `dockerd --validate --config-file <minimal-valid-config>` for config-path changes, or a short `perf`/`strace` sample of a locally started test daemon while issuing the suspected API call. Do not claim reproduced unless that command actually shows repeated `bpf_lsm_file_permission` or the specific syscall pattern tied to the candidate code path.

## Patch Pass

Subject: No patch: diagnose dockerd LSM perf sample

## Commit Message
No source change is included. The collected evidence points to a kernel-side Linux Security Module hook sample, not to a confirmed `dockerd` userspace loop or a source-level Moby bug.

## Evidence Confidence
inferred

## Issue Connection
The collected signal is a 3-second profile of `/usr/sbin/dockerd` where perf attributed samples to kernel `bpf_lsm_file_permission`, while `/proc` evidence showed the daemon sleeping at about `0.1%` CPU. The embedded strace excerpt is dominated by `futex` waits and `waitid`, and the kernel stack excerpt is a futex wait path, so the evidence does not support the bundle’s higher-level “socket-churn” label as a confirmed userspace loop.

The cautious inference is that perf sampled a kernel file-permission hook while the daemon was mostly idle. The raw artifact paths referenced by the bundle are absent from this workspace, and the bundled backtraces are stripped, so I could not connect the sample to a Go function or a daemon request path.

I followed the saved plan and did not leave a source diff. I inspected the `dockerd` entrypoint and daemon setup, plus the nearby daemon helper most plausibly related to file-permission checks: `daemon/internal/filedescriptors.GetTotalUsedFds`. The current source already uses a Linux 6.2+ `stat` fast path before falling back to opening `/proc/<pid>/fd`, and there is no evidence that repeated `/info` requests or this helper produced the observed sample. Local conventions found were `log.G(ctx)` for logging, `daemon/internal/filedescriptors.GetTotalUsedFds` for daemon FD counting, `engine/pkg/system` compatibility helpers where applicable, and the existing Cobra/config patterns in `cmd/dockerd`.

No code change was made, so there is no runtime effect. The expected effect of this report is to avoid an upstream patch based on indirect profiler evidence until a new trace ties `bpf_lsm_file_permission` activity to a specific Moby code path.

## Git Add Paths
None

## Validation
`timeout 60s debian/rules override_dh_auto_test` failed from the workspace root because the prepared tree has no built binaries: `_build/bin/docker: No such file or directory`.

`go test -mod=vendor ./daemon/internal/filedescriptors` failed because Debian’s split source has inconsistent module/vendor metadata for direct module-mode testing.

Independent reproduction attempt: `timeout 10s perf record -g -o /tmp/fixer-dockerd-validate.perf.data -- /usr/sbin/dockerd --validate --config-file /dev/null` was blocked by kernel perf permissions: `perf_event_paranoid setting is 3` and perf could not open any events.

Raw artifact check confirmed the referenced `strace.log` and `fd-targets.txt` paths are not present. `git status --short` remained clean.

## Review Pass 1

RESULT: ok

No blocking findings.

The first pass leaves no source diff, which matches the indirect evidence level. The author correctly classifies confidence as `inferred`, avoids inventing a reproduced failure, and reports the project-level validation attempt with its exact blocker. The maintainer-facing explanation ties the perf `bpf_lsm_file_permission` sample, sleeping/futex evidence, and missing raw artifacts to the decision not to patch. The report also names relevant local conventions/helpers (`log.G(ctx)`, `daemon/internal/filedescriptors.GetTotalUsedFds`, `engine/pkg/system`, Cobra/config patterns) and the workspace is clean.

## Plan Pass

## Problem
Fixer observed `dockerd` with a 3-second perf profile attributing the sampled hot path to kernel `bpf_lsm_file_permission`, while the process itself was sleeping with about `0.1%` CPU. Embedded `strace` and stack excerpts are dominated by `futex` waits, not a confirmed tight userspace loop. The raw artifact files referenced by the bundle are not present in the workspace, and the stripped backtrace does not map to Go symbols.

## Evidence Confidence
inferred

## Proposed Subject
No source patch yet: diagnose the `dockerd` profiler signal as insufficient for an upstream Moby change until an independent low-cost signal ties `bpf_lsm_file_permission` activity to a specific daemon code path.

## Patch Plan
1. Do not edit files on the current evidence alone. The evidence is profiler-only/indirect, low-CPU, kernel-attributed, and does not identify a Docker source function.
2. Improve or replace any prior Fixer attempt that treats this as confirmed socket churn; the embedded `strace` excerpts show `futex`/`waitid`, and the raw strace is unavailable.
3. If more evidence is collected, start from the `dockerd` entrypoint in `engine/cmd/dockerd/docker.go` and daemon setup in `engine/cmd/dockerd/daemon.go`, only then inspect runtime/containerd paths if the new evidence points there.
4. Follow Moby conventions from `engine/CONTRIBUTING.md` and `engine/TESTING.md`: Go changes under `cmd/dockerd` or `daemon`, unit tests for bug fixes, `gofmt -s -w`, and clear maintainer-facing commit text.
5. Prefer local conventions/helpers if a patch becomes justified: `log.G(ctx)` for logging, `daemon/internal/filedescriptors.GetTotalUsedFds` for daemon FD counting, `engine/pkg/system` compatibility helpers where applicable, and existing Cobra/config patterns in `cmd/dockerd`. Reject awkward control flow such as avoidable `goto`; use bounded helper functions or early returns.

## Risks
A source patch from this evidence would likely be speculative. The observed hot symbol is in the kernel LSM path, the sampled package list implicates the kernel image, CPU use is low, and no daemon API request, file path, fd target, or Go symbol is available to connect the cost to Moby code.

## Validation
If later evidence supports a source change, first try the reproducible project entrypoint from the workspace root: `cd engine && make test-unit TESTDIRS=./cmd/dockerd ./daemon`. 

[truncated]

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

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: 29.13% of sampled CPU passed through __vma_start_write, with repeated thread backtraces show 1 thread(s) around 0x00007fee4ee7b7d2 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

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. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, 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. 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): `make` and, if available, `make check`. If the project-level command fails because dependencies or generated files are missing, include the exact command and failure reason in `## Validation`, then run the narrowest relevant compile/test that is still reproducible from a clean checkout.

Upstream-style expectation: before planning or editing, check for contribution/style docs (`CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, `dev-docs/`) and scan the touched subsystem for local helpers. If the project has wrappers for file IO, path-relative IO, process spawning, memory allocation, logging, locking, or platform compatibility, prefer those wrappers over generic libc/std APIs. Do not invent a reproducer or user-visible failure that is not in the evidence bundle; if the evidence is profiler-only or indirect, describe it as a targeted mitigation or stop with a diagnosis instead of presenting a speculative patch as a confirmed bug fix. In the plan and final validation, name any such helper, convention, 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. 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: bin/postalias, bin/postcat, bin/postconf, bin/postdrop, bin/postfix, bin/postkick, bin/postlock, bin/postlog, bin/postmap, bin/postmulti, bin/postqueue, bin/postsuper, bin/posttls-finger, bin/qmqp-sink, bin/qmqp-source, bin/rmail, bin/sendmail, bin/smtp-sink, bin/smtp-source, conf/bounce.cf.default, conf/main.cf.default, conf/makedefs.out, include/abounce.h, include/addr_match_list.h, include/allowed_prefix.h, include/anvil_clnt.h, include/argv.h, include/argv_attr.h, include/ascii_header_text.h, include/attr.h, include/attr_clnt.h, include/attr_override.h, include/auto_clnt.h, include/base32_code.h, include/base64_code.h, include/been_here.h, include/binhash.h, include/bounce.h, include/bounce_log.h, include/byte_mask.h, include/canon_addr.h, include/cfg_parser.h, include/check_arg.h, include/chroot_uid.h, include/cidr_match.h, include/clean_ascii_cntrl_space.h, include/clean_env.h, include/cleanup_user.h, include/clnt_stream.h, include/compat_level.h, include/compat_va_copy.h, include/config.h, include/config_known_tcp_ports.h, include/connect.h, include/conv_time.h, include/ctable.h, include/data_redirect.h, include/db_common.h, include/debug_peer.h, include/debug_process.h, include/defer.h, include/deliver_completed.h, include/deliver_flock.h, include/deliver_pass.h, include/deliver_request.h, include/delivered_hdr.h, include/dict.h, include/dict_cache.h, include/dict_cdb.h, include/dict_cidr.h, include/dict_db.h, include/dict_dbm.h, include/dict_debug.h, include/dict_env.h, include/dict_fail.h, include/dict_ht.h, include/dict_inline.h, include/dict_ldap.h, include/dict_lmdb.h, include/dict_memcache.h, include/dict_mongodb.h, include/dict_mysql.h, include/dict_ni.h, include/dict_nis.h, include/dict_nisplus.h, include/dict_pcre.h, include/dict_pgsql.h, include/dict_pipe.h, include/dict_proxy.h, include/dict_random.h, include/dict_regexp.h, include/dict_sdbm.h, include/dict_sockmap.h, include/dict_sqlite.h, include/dict_static.h, include/dict_tcp.h, include/dict_test_helper.h, include/dict_thash.h, include/dict_union.h, include/dict_unix.h, include/dir_forest.h, include/dns.h, include/domain_list.h, include/dot_lockfile.h, include/dot_lockfile_as.h, include/dsb_scan.h, include/dsn.h, include/dsn_buf.h, include/dsn_filter.h, include/dsn_mask.h, include/dsn_print.h, include/dsn_util.h, include/dynamicmaps.h, include/edit_file.h, include/ehlo_mask.h, include/events.h, include/exec_command.h, include/ext_prop.h, include/file_id.h, include/find_inet.h, include/flush_clnt.h, include/fold_addr.h, include/format_tv.h, include/fsspace.h, include/fullname.h, include/get_domainname.h, include/get_hostname.h, include/haproxy_srvr.h, include/hash_fnv.h, include/header_body_checks.h, include/header_opts.h, include/header_token.h, include/hex_code.h, include/hex_quote.h, include/hfrom_format.h, include/host_port.h, include/htable.h, include/inet_addr_host.h, include/inet_addr_list.h, include/inet_addr_local.h, include/inet_addr_sizes.h, include/inet_prefix_top.h, include/inet_proto.h, include/info_log_addr_form.h, include/input_transp.h, include/int_filt.h, include/iostuff.h, include/ip_match.h, include/is_header.h, include/killme_after.h, include/known_tcp_ports.h, include/ldseed.h, include/lex_822.h, include/line_number.h, include/line_wrap.h, include/listen.h, include/load_file.h, include/load_lib.h, include/log_adhoc.h, include/login_sender_match.h, include/logwriter.h, include/lstat_as.h, include/mac_expand.h, include/mac_midna.h, include/mac_parse.h, include/mail_addr.h, include/mail_addr_crunch.h, include/mail_addr_find.h, include/mail_addr_form.h, include/mail_addr_map.h, include/mail_conf.h, include/mail_copy.h, include/mail_date.h, include/mail_dict.h, include/mail_error.h, include/mail_flow.h, include/mail_flush.h, include/mail_open_ok.h, include/mail_params.h, include/mail_parm_split.h, include/mail_proto.h, include/mail_queue.h, include/mail_run.h, include/mail_scan_dir.h, include/mail_server.h, include/mail_stream.h, include/mail_task.h, include/mail_version.h, include/maillog_client.h, include/make_dirs.h, include/map_search.h, include/maps.h, include/mark_corrupt.h, include/mask_addr.h, include/master_proto.h, include/match_list.h, include/match_parent_style.h, include/match_service.h, include/mbox_conf.h, include/mbox_open.h, include/memcache_proto.h, include/midna_adomain.h, include/midna_domain.h, include/milter.h, include/mime_state.h, include/mkmap.h, include/mock_dict.h, include/mock_open_as.h, include/mock_spawn_command.h, include/mock_stat.h, include/msg.h, include/msg_capture.h, include/msg_logger.h, include/msg_output.h, include/msg_stats.h, include/msg_syslog.h, include/msg_vstream.h, include/mvect.h, include/myaddrinfo.h, include/myflock.h, include/mymalloc.h, include/mynetworks.h, include/mypwd.h, include/myrand.h, include/namadr_list.h, include/name_code.h, include/name_mask.h, include/nbbio.h, include/nbdb_clnt.h, include/nbdb_redirect.h, include/nbdb_surrogate.h, include/nbdb_util.h, include/netstring.h, include/normalize_mailhost_addr.h, include/normalize_v4mapped_addr.h, include/nvtable.h, include/off_cvt.h, include/open_as.h, include/open_lock.h, include/opened.h, include/ossl_digest.h, include/own_inet_addr.h, include/parse_utf8_char.h, include/pipe_command.h, include/pol_stats.h, include/posix_signals.h, include/post_mail.h, include/qmgr_user.h, include/qmqp_proto.h, include/quote_821_local.h, include/quote_822_local.h, include/quote_flags.h, include/rcpt_buf.h, include/rcpt_print.h, include/readlline.h, include/rec_attr_map.h, include/rec_streamlf.h, include/rec_type.h, include/recipie

[truncated 31096 bytes]

## Plan Pass

## Problem
Fixer observed `smtpd` with a stack in the SMTP input path: `smtp_get()` -> `smtp_get_noexcept()` -> `vstring_get_flags_bound()` -> `timed_read()` -> `poll_fd()` -> `poll()`. The same bundle reports `State: S (sleeping)`, `wchan: poll_schedule_timeout`, one `restart_syscall` over 5 seconds, and only `1.7%` sampled CPU. That does not establish a Postfix busy loop.

## Evidence Confidence
inferred

## Proposed Subject
No upstream source patch yet: diagnose `smtpd` poll-wait evidence as insufficient for a safe Postfix code change.

## Patch Plan
Do not edit source from this evidence. The collected signal is indirect/profiler-heavy and internally points to a blocked read path, not a proven runaway userspace loop.

Relevant conventions found: no `CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, or `dev-docs`; repo guidance exists in `AAAREADME`, `TESTING`, `PORTING`, and `.indent.pro`. The touched subsystem uses Postfix wrappers: `VSTREAM`/`VSTRING`, `smtp_stream_setup()`, `smtp_timeout_reset()`, `smtp_get()`, `smtp_get_noexcept()`, `timed_read()`, `poll_fd()`, `msg_*()` logging, and `mymalloc()`/`myfree()` allocation. Any future patch should preserve those helpers and avoid raw libc I/O or avoidable `goto` control flow.

Prior Fixer work already produced a no-patch diagnosis; improve/replace it only with clearer maintainer-facing evidence limits and validation notes, not a speculative Debian-local workaround.

## Risks
A premature patch could weaken SMTP timeout/deadline behavior, especially `smtpd_timeout`, `smtpd_per_request_deadline`, and minimum data-rate accounting. The observed installed binary was `3.10.6-1`, while this workspace is `3.11.2`, so unsymbolized offsets may not map cleanly.

## Validation
Before any focused check, try from the workspace root: `make`, then `make check` if available. If `make check` is unavailable, try the project test entrypoint `make tests`.

If the project-level command fails because dependencies or generated files are missing, record the exact command and blocker, then fall back to the narrowest relevant target such as `make makefiles ... && make`, `make -C src/global test`, `make -C src/util test`, or `make -C src/smtpd test`.

Bounded independent reproduction attempt: after build, run a short local `smtpd` smoke/trace invocation matching the evidence command when sandbox permissions allow it, and report whether it actually spins or simply blocks/exits. Do not claim `reproduced` unless that command shows the failure.

## Patch Pass

Subject: diagnose smtpd poll wait evidence as insufficient for patch

## Commit Message
No source change was made. The collected `smtpd` evidence points to a process blocked in Postfix’s SMTP stream input path, not to a confirmed tight userspace loop, so an upstream patch would be speculative without stronger evidence.

## Evidence Confidence
inferred

## Issue Connection
Fixer sampled an installed `smtpd` process whose stack passed through `smtp_get()`, `smtp_get_noexcept()`, `vstring_get_flags_bound()`, `timed_read()`, `poll_fd()`, and `poll()`. The same bundle reports `State: S (sleeping)`, `wchan: poll_schedule_timeout`, one `restart_syscall` over 5 seconds, and only `1.7%` sampled CPU.

The cautious inference is that `smtpd` was waiting for SMTP input through Postfix’s normal buffered I/O path. The `gettimeofday@plt` sample is consistent with `VSTREAM` deadline accounting, but the evidence does not prove a Postfix busy loop or timeout-accounting bug.

I followed the saved plan and left no source diff. Relevant local conventions found: no `CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, or `dev-docs`; guidance is in `AAAREADME`, `TESTING`, `PORTING`, and `.indent.pro`. The implicated code uses Postfix helpers such as `VSTREAM`/`VSTRING`, `smtp_stream_setup()`, `smtp_timeout_reset()`, `timed_read()`, `poll_fd()`, `msg_*()`, and `mymalloc()`/`myfree()`.

The expected effect of this no-patch result is to avoid weakening SMTP timeout/deadline behavior based on indirect profiler evidence. A source patch needs stronger observed or reproduced evidence, such as a symbolized repeating userspace stack or a reproducible SMTP session that shows spinning rather than blocking in `poll`.

## Git Add Paths
None

## Validation
`make check`: failed because this tree has no `check` target: `make: *** No rule to make target 'check'. Stop.`

`make`: failed from the workspace root because Berkeley DB headers are missing: `No <db.h> include file found.`

`make makefiles CCARGS='-DNO_DB -DNO_NIS' default_database_type=cdb default_cache_db_type=cdb && make`: completed successfully.

`make tests`: failed in `src/util` during `dict_test` because `postmap` could not open `/etc/postfix/main.cf`: `postmap: fatal: open /etc/postfix/main.cf: No such file or directory`.

Independent reproduction attempt: `timeout 5s strace -f -tt -e trace=poll,restart_syscall,read ./libexec/smtpd -n smtp -t inet -u -c -o stress= -s 2` was blocked by ptrace restrictions: `PTRACE_TRACEME: Operation not permitted`. Running `timeout 5s ./libexec/smtpd -n smtp -t inet -u -c -o stress= -s 2` exited with status 1 and did not reproduce the collected poll-wait signal.

## Review Pass 1 (local metadata check)

RESULT: fix-needed

## Findings
1. Patch metadata drift: the workspace currently changes `bin/postalias`, `bin/postcat`, `bin/postconf`, `bin/postdrop`, `bin/postfix`, `bin/postkick`, `bin/postlock`, `bin/postlog`, `bin/postmap`, `bin/postmulti`, `bin/postqueue`, `bin/postsuper`, `bin/posttls-finger`, `bin/qmqp-sink`, `bin/qmqp-source`, `bin/rmail`, `bin/sendmail`, `bin/smtp-sink`, `bin/smtp-source`, `conf/bounce.cf.default`, `conf/main.cf.default`, `conf/makedefs.out`, `include/abounce.h`, `include/addr_match_list.h`, `include/allowed_prefix.h`, `include/anvil_clnt.h`, `include/argv.h`, `include/argv_attr.h`, `include/ascii_header_text.h`, `include/attr.h`, `include/attr_clnt.h`, `include/attr_override.h`, `include/auto_clnt.h`, `include/base32_code.h`, `include/base64_code.h`, `include/been_here.h`, `include/binhash.h`, `include/bounce.h`, `include/bounce_log.h`, `include/byte_mask.h`, `include/canon_addr.h`, `include/cfg_parser.h`, `include/check_arg.h`, `include/chroot_uid.h`, `include/cidr_match.h`, `include/clean_ascii_cntrl_space.h`, `include/clean_env.h`, `include/cleanup_user.h`, `include/clnt_stream.h`, `include/compat_level.h`, `include/compat_va_copy.h`, `include/config.h`, `include/config_known_tcp_ports.h`, `include/connect.h`, `include/conv_time.h`, `include/ctable.h`, `include/data_redirect.h`, `include/db_common.h`, `include/debug_peer.h`, `include/debug_process.h`, `include/defer.h`, `include/deliver_completed.h`, `include/deliver_flock.h`, `include/deliver_pass.h`, `include/deliver_request.h`, `include/delivered_hdr.h`, `include/dict.h`, `include/dict_cache.h`, `include/dict_cdb.h`, `include/dict_cidr.h`, `include/dict_db.h`, `include/dict_dbm.h`, `include/dict_debug.h`, `include/dict_env.h`, `include/dict_fail.h`, `include/dict_ht.h`, `include/dict_inline.h`, `include/dict_ldap.h`, `include/dict_lmdb.h`, `include/dict_memcache.h`, `include/dict_mongodb.h`, `include/dict_mysql.h`, `include/dict_ni.h`, `include/dict_nis.h`, `include/dict_nisplus.h`, `include/dict_pcre.h`, `include/dict_pgsql.h`, `include/dict_pipe.h`, `include/dict_proxy.h`, `include/dict_random.h`, `include/dict_regexp.h`, `include/dict_sdbm.h`, `include/dict_sockmap.h`, `include/dict_sqlite.h`, `include/dict_static.h`, `include/dict_tcp.h`, `include/dict_test_helper.h`, `include/dict_thash.h`, `include/dict_union.h`, `include/dict_unix.h`, `include/dir_forest.h`, `include/dns.h`, `include/domain_list.h`, `include/dot_lockfile.h`, `include/dot_lockfile_as.h`, `include/dsb_scan.h`, `include/dsn.h`, `include/dsn_buf.h`, `include/dsn_filter.h`, `include/dsn_mask.h`, `include/dsn_print.h`, `include/dsn_util.h`, `include/dynamicmaps.h`, `include/edit_file.h`, `include/ehlo_mask.h`, `include/events.h`, `include/exec_command.h`, `include/ext_prop.h`, `include/file_id.h`, `include/find_inet.h`, `include/flush_clnt.h`, `include/fold_addr.h`, `include/format_tv.h`, `include/fsspace.h`, `include/fullname.h`, `include/get_domainname.h`, `include/get_hostname.h`, `include/haproxy_srvr.h`, `include/hash_fnv.h`, `include/header_body_checks.h`, `include/header_opts.h`, `include/header_token.h`, `include/hex_code.h`, `include/hex_quote.h`, `include/hfrom_format.h`, `include/host_port.h`, `include/htable.h`, `include/inet_addr_host.h`, `include/inet_addr_list.h`, `include/inet_addr_local.h`, `include/inet_addr_sizes.h`, `include/inet_prefix_top.h`, `include/inet_proto.h`, `include/info_log_addr_form.h`, `include/input_transp.h`, `include/int_filt.h`, `include/iostuff.h`, `include/ip_match.h`, `include/is_header.h`, `include/killme_after.h`, `include/known_tcp_ports.h`, `include/ldseed.h`, `include/lex_822.h`, `include/line_number.h`, `include/line_wrap.h`, `include/listen.h`, `include/load_file.h`, `include/load_lib.h`, `include/log_adhoc.h`, `include/login_sender_match.h`, `include/logwriter.h`, `include/lstat_as.h`, `include/mac_expand.h`, `include/mac_midna.h`, `include/mac_parse.h`, `include/mail_addr.h`, `include/mail_addr_crunch.h`, 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`src/qmgr/qmgr.o`, `src/qmgr/qmgr_active.o`, `src/qmgr/qmgr_bounce.o`, `src/qmgr/qmgr_defer.o`, `src/qmgr/qmgr_deliver.o`, `src/qmgr/qmgr_enable.o`, `src/qmgr/qmgr_entry.o`, `src/qmgr/qmgr_error.o`, `src/qmgr/qmgr_feedback.o`, `src/qmgr/qmgr_job.o`, `src/qmgr/qmgr_message.o`, `src/qmgr/qmgr_move.o`, `src/qmgr/qmgr_peer.o`, `src/qmgr/qmgr_queue.o`, `src/qmgr/qmgr_scan.o`, `src/qmgr/qmgr_transport.o`, `src/qmqpd/Makefile`, `src/qmqpd/qmqpd`, `src/qmqpd/qmqpd.o`, `src/qmqpd/qmqpd_peer.o`, `src/qmqpd/qmqpd_state.o`, `src/scache/Makefile`, `src/scache/scache`, `src/scache/scache.o`, `src/sendmail/Makefile`, `src/sendmail/sendmail`, `src/sendmail/sendmail.o`, `src/showq/Makefile`, `src/showq/showq`, `src/showq/showq.o`, `src/smtp/Makefile`, `src/smtp/smtp`, `src/smtp/smtp.o`, `src/smtp/smtp_addr.o`, `src/smtp/smtp_chat.o`, `src/smtp/smtp_connect.o`, `src/smtp/smtp_key.o`, `src/smtp/smtp_map11.o`, `src/smtp/smtp_misc.o`, `src/smtp/smtp_proto.o`, `src/smtp/smtp_rcpt.o`, `src/smtp/smtp_reqtls_policy.o`, `src/smtp/smtp_reuse.o`, `src/smtp/smtp_sasl_auth_cache.o`, `src/smtp/smtp_sasl_glue.o`, `src/smtp/smtp_sasl_proto.o`, `src/smtp/smtp_session.o`, `src/smtp/smtp_state.o`, `src/smtp/smtp_tls_policy.o`, `src/smtp/smtp_tlsrpt.o`, `src/smtp/smtp_trouble.o`, `src/smtpd/Makefile`, `src/smtpd/smtpd`, `src/smtpd/smtpd.o`, `src/smtpd/smtpd_chat.o`, `src/smtpd/smtpd_check.o`, `src/smtpd/smtpd_dsn_fix.o`, `src/smtpd/smtpd_expand.o`, `src/smtpd/smtpd_haproxy.o`, `src/smtpd/smtpd_milter.o`, `src/smtpd/smtpd_peer.o`, `src/smtpd/smtpd_proxy.o`, `src/smtpd/smtpd_resolve.o`, `src/smtpd/smtpd_sasl_glue.o`, `src/smtpd/smtpd_sasl_proto.o`, `src/smtpd/smtpd_state.o`, `src/smtpd/smtpd_token.o`, `src/smtpd/smtpd_xforward.o`, `src/smtpstone/Makefile`, `src/smtpstone/qmqp-sink`, `src/smtpstone/qmqp-sink.o`, `src/smtpstone/qmqp-source`, `src/smtpstone/qmqp-source.o`, `src/smtpstone/smtp-sink`, `src/smtpstone/smtp-sink.o`, `src/smtpstone/smtp-source`, `src/smtpstone/smtp-source.o`, `src/spawn/Makefile`, `src/spawn/spawn`, `src/spawn/spawn.o`, `src/testing/Makefile`, `src/testing/dict_test_helper.o`, `src/testing/libtesting.a`, `src/testing/mock_dict.o`, `src/testing/mock_open_as.o`, `src/testing/mock_spawn_command.o`, `src/testing/mock_stat.o`, `src/testing/msg_capture.o`, `src/testing/nosleep.so`, `src/tls/Makefile`, `src/tls/libtls.a`, `src/tls/tls_bio_ops.o`, `src/tls/tls_certkey.o`, `src/tls/tls_client.o`, `src/tls/tls_dane.o`, `src/tls/tls_dh.o`, `src/tls/tls_fprint.o`, `src/tls/tls_level.o`, `src/tls/tls_mgr.o`, `src/tls/tls_misc.o`, `src/tls/tls_prng_dev.o`, `src/tls/tls_prng_egd.o`, `src/tls/tls_prng_exch.o`, `src/tls/tls_prng_file.o`, `src/tls/tls_proxy_client_misc.o`, `src/tls/tls_proxy_client_print.o`, `src/tls/tls_proxy_client_scan.o`, `src/tls/tls_proxy_clnt.o`, `src/tls/tls_proxy_context_print.o`, `src/tls/tls_proxy_context_scan.o`, `src/tls/tls_proxy_server_print.o`, `src/tls/tls_proxy_server_scan.o`, `src/tls/tls_scache.o`, `src/tls/tls_seed.o`, `src/tls/tls_server.o`, `src/tls/tls_session.o`, `src/tls/tls_stream.o`, `src/tls/tls_verify.o`, `src/tls/tlsrpt_wrapper.o`, `src/tlsmgr/Makefile`, `src/tlsmgr/tlsmgr`, `src/tlsmgr/tlsmgr.o`, `src/tlsproxy/Makefile`, `src/tlsproxy/tlsproxy`, `src/tlsproxy/tlsproxy.o`, `src/tlsproxy/tlsproxy_state.o`, `src/trivial-rewrite/Makefile`, `src/trivial-rewrite/resolve.o`, `src/trivial-rewrite/rewrite.o`, `src/trivial-rewrite/transport.o`, `src/trivial-rewrite/trivial-rewrite`, `src/trivial-rewrite/trivial-rewrite.o`, `src/util/Makefile`, `src/util/allascii.o`, `src/util/alldig.o`, `src/util/allprint.o`, `src/util/allspace.o`, `src/util/argv.o`, `src/util/argv_attr_print.o`, `src/util/argv_attr_scan.o`, `src/util/argv_split.o`, `src/util/argv_split_at.o`, `src/util/argv_splitq.o`, `src/util/attr_clnt.o`, `src/util/attr_print0.o`, `src/util/attr_print64.o`, `src/util/attr_print_plain.o`, `src/util/attr_scan0.o`, `src/util/attr_scan64.o`, `src/util/attr_scan_plain.o`, `src/util/auto_clnt.o`, `src/util/balpar.o`, `src/util/base32_code.o`, `src/util/base64_code.o`, `src/util/basename.o`, `src/util/binhash.o`, `src/util/byte_mask.o`, `src/util/casefold.o`, `src/util/chroot_uid.o`, `src/util/cidr_match.o`, `src/util/clean_ascii_cntrl_space.o`, `src/util/clean_env.o`, `src/util/close_on_exec.o`, `src/util/concatenate.o`, `src/util/ctable.o`, `src/util/dict.o`, `src/util/dict_alloc.o`, `src/util/dict_cache.o`, `src/util/dict_cdb.o`, `src/util/dict_cidr.o`, `src/util/dict_db.o`, `src/util/dict_dbm.o`, `src/util/dict_debug.o`, `src/util/dict_env.o`, `src/util/dict_fail.o`, `src/util/dict_file.o`, `src/util/dict_ht.o`, `src/util/dict_inline.o`, `src/util/dict_lmdb.o`, `src/util/dict_ni.o`, `src/util/dict_nis.o`, `src/util/dict_nisplus.o`, `src/util/dict_open`, `src/util/dict_open.o`, `src/util/dict_pcre.o`, `src/util/dict_pipe.o`, `src/util/dict_random.o`, `src/util/dict_regexp.o`, `src/util/dict_sdbm.o`, `src/util/dict_sockmap.o`, `src/util/dict_static.o`, `src/util/dict_stream.o`, `src/util/dict_surrogate.o`, `src/util/dict_tcp.o`, `src/util/dict_test.o`, `src/util/dict_thash.o`, `src/util/dict_union.o`, `src/util/dict_unix.o`, `src/util/dict_utf8.o`, `src/util/dir_forest.o`, `src/util/doze.o`, `src/util/dummy_read.o`, `src/util/dummy_write.o`, `src/util/duplex_pipe.o`, `src/util/edit_file.o`, `src/util/environ.o`, `src/util/events.o`, `src/util/exec_command.o`, `src/util/extpar.o`, `src/util/fifo_listen.o`, `src/util/fifo_trigger.o`, `src/util/file_limit.o`, `src/util/find_inet.o`, `src/util/format_tv.o`, `src/util/fsspace.o`, `src/util/fullname.o`, `src/util/get_domainname.o`, `src/util/get_hostname.o`, `src/util/hash_fnv.o`, `src/util/hex_code.o`, `src/util/hex_quote.o`, `src/util/host_port.o`, `src/util/htable.o`, `src/util/inet_addr_host.o`, `src/util/inet_addr_list.o`, `src/util/inet_addr_local.o`, `src/util/inet_addr_sizes.o`, `src/util/inet_connect.o`, `src/util/inet_listen.o`, `src/util/inet_prefix_top.o`, `src/util/inet_proto.o`, `src/util/inet_trigger.o`, `src/util/inet_windowsize.o`, `src/util/ip_match.o`, `src/util/killme_after.o`, `src/util/known_tcp_ports.o`, `src/util/ldseed.o`, `src/util/libutil.a`, `src/util/line_number.o`, `src/util/line_wrap.o`, `src/util/load_file.o`, `src/util/load_lib.o`, `src/util/logwriter.o`, `src/util/lowercase.o`, `src/util/lstat_as.o`, `src/util/mac_expand`, `src/util/mac_expand.o`, `src/util/mac_midna.o`, `src/util/mac_parse.o`, `src/util/make_dirs.o`, `src/util/mask_addr.o`, `src/util/match_list.o`, `src/util/match_ops.o`, `src/util/midna_domain.o`, `src/util/mkmap_cdb.o`, `src/util/mkmap_db.o`, `src/util/mkmap_dbm.o`, `src/util/mkmap_fail.o`, `src/util/mkmap_lmdb.o`, `src/util/mkmap_open.o`, `src/util/mkmap_sdbm.o`, `src/util/msg.o`, `src/util/msg_logger.o`, `src/util/msg_output.o`, `src/util/msg_rate_delay.o`, `src/util/msg_syslog.o`, `src/util/msg_vstream.o`, `src/util/mvect.o`, `src/util/myaddrinfo.o`, `src/util/myflock.o`, `src/util/mymalloc.o`, `src/util/myrand.o`, `src/util/mystrerror.o`, `src/util/mystrtok.o`, `src/util/name_code.o`, `src/util/name_mask.o`, `src/util/nbbio.o`, `src/util/netstring.o`, `src/util/neuter.o`, `src/util/non_blocking.o`, `src/util/normalize_v4mapped_addr.o`, `src/util/normalize_ws.o`, `src/util/nvtable.o`, `src/util/open_as.o`, `src/util/open_limit.o`, `src/util/open_lock.o`, `src/util/ossl_digest.o`, `src/util/pass_accept.o`, `src/util/pass_trigger.o`, `src/util/peekfd.o`, `src/util/poll_fd.o`, `src/util/posix_signals.o`, `src/util/printable.o`, `src/util/quote_for_json.o`, `src/util/rand_sleep.o`, `src/util/readlline.o`, `src/util/recv_pass_attr.o`, `src/util/ring.o`, `src/util/safe_getenv.o`, `src/util/safe_open.o`, `src/util/sane_accept.o`, `src/util/sane_basename.o`, `src/util/sane_connect.o`, `src/util/sane_link.o`, `src/util/sane_rename.o`, `src/util/sane_sockaddr_to_hostaddr.o`, `src/util/sane_socketpair.o`, `src/util/sane_strtol.o`, `src/util/sane_time.o`, `src/util/scan_dir.o`, `src/util/set_eugid.o`, `src/util/set_ugid.o`, `src/util/sigdelay.o`, `src/util/skipblanks.o`, `src/util/slmdb.o`, `src/util/sock_addr.o`, `src/util/spawn_command.o`, `src/util/split_at.o`, `src/util/split_nameval.o`, `src/util/split_qnameval.o`, `src/util/stat_as.o`, `src/util/strcasecmp_utf8.o`, `src/util/stream_connect.o`, `src/util/stream_listen.o`, `src/util/stream_recv_fd.o`, `src/util/stream_send_fd.o`, `src/util/stream_trigger.o`, `src/util/sys_compat.o`, `src/util/timecmp.o`, `src/util/timed_connect.o`, `src/util/timed_read.o`, `src/util/timed_wait.o`, `src/util/timed_write.o`, `src/util/translit.o`, `src/util/trimblanks.o`, `src/util/unescape.o`, `src/util/unix_connect.o`, `src/util/unix_dgram_connect.o`, `src/util/unix_dgram_listen.o`, `src/util/unix_listen.o`, `src/util/unix_pass_fd_fix.o`, `src/util/unix_recv_fd.o`, `src/util/unix_send_fd.o`, `src/util/unix_trigger.o`, `src/util/unsafe.o`, `src/util/uppercase.o`, `src/util/username.o`, `src/util/valid_hostname`, `src/util/valid_hostname.o`, `src/util/valid_uri_scheme.o`, `src/util/valid_utf8_hostname.o`, `src/util/valid_utf8_string.o`, `src/util/vbuf.o`, `src/util/vbuf_print.o`, `src/util/vstream.o`, `src/util/vstream_popen.o`, `src/util/vstream_tweak.o`, `src/util/vstring.o`, `src/util/vstring_vstream.o`, `src/util/warn_stat.o`, `src/util/watchdog.o`, `src/util/wrap_stat.o`, `src/util/write_buf.o`, `src/verify/Makefile`, `src/verify/verify`, `src/verify/verify.o`, `src/virtual/Makefile`, `src/virtual/deliver_attr.o`, `src/virtual/mailbox.o`, `src/virtual/maildir.o`, `src/virtual/recipient.o`, `src/virtual/unknown.o`, `src/virtual/virtual`, `src/virtual/virtual.o`, `src/xsasl/Makefile`, `src/xsasl/libxsasl.a`, `src/xsasl/xsasl_client.o`, `src/xsasl/xsasl_cyrus_client.o`, `src/xsasl/xsasl_cyrus_log.o`, `src/xsasl/xsasl_cyrus_security.o`, `src/xsasl/xsasl_cyrus_server.o`, `src/xsasl/xsasl_dovecot_server.o`, `src/xsasl/xsasl_server.o`, 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`: `bin/postalias`, `bin/postcat`, `bin/postconf`, `bin/postdrop`, `bin/postfix`, `bin/postkick`, `bin/postlock`, `bin/postlog`, `bin/postmap`, `bin/postmulti`, `bin/postqueue`, `bin/postsuper`, `bin/posttls-finger`, `bin/qmqp-sink`, `bin/qmqp-source`, `bin/rmail`, `bin/sendmail`, `bin/smtp-sink`, `bin/smtp-source`, `conf/bounce.cf.default`, `conf/main.cf.default`, `conf/makedefs.out`, `include/abounce.h`, `include/addr_match_list.h`, `include/allowed_prefix.h`, `include/anvil_clnt.h`, `include/argv.h`, `include/argv_attr.h`, `include/ascii_header_text.h`, `include/attr.h`, `include/attr_clnt.h`, `include/attr_override.h`, `include/auto_clnt.h`, `include/base32_code.h`, `include/base64_code.h`, `include/been_here.h`, `include/binhash.h`, `include/bounce.h`, `include/bounce_log.h`, `include/byte_mask.h`, `include/canon_addr.h`, `include/cfg_parser.h`, `include/check_arg.h`, `include/chroot_uid.h`, `include/cidr_match.h`, `include/clean_ascii_cntrl_space.h`, `include/clean_env.h`, `include/cleanup_user.h`, `include/clnt_stream.h`, `include/compat_level.h`, `include/compat_va_copy.h`, `include/config.h`, `include/config_known_tcp_ports.h`, `include/connect.h`, `include/conv_time.h`, `include/ctable.h`, `include/data_redirect.h`, `include/db_common.h`, `include/debug_peer.h`, `include/debug_process.h`, `include/defer.h`, `include/deliver_completed.h`, `include/deliver_flock.h`, `include/deliver_pass.h`, `include/deliver_request.h`, `include/delivered_hdr.h`, `include/dict.h`, `include/dict_cache.h`, `include/dict_cdb.h`, `include/dict_cidr.h`, `include/dict_db.h`, `include/dict_dbm.h`, `include/dict_debug.h`, `include/dict_env.h`, `include/dict_fail.h`, `include/dict_ht.h`, `include/dict_inline.h`, `include/dict_ldap.h`, `include/dict_lmdb.h`, `include/dict_memcache.h`, `include/dict_mongodb.h`, `include/dict_mysql.h`, `include/dict_ni.h`, `include/dict_nis.h`, `include/dict_nisplus.h`, `include/dict_pcre.h`, `include/dict_pgsql.h`, `include/dict_pipe.h`, `include/dict_proxy.h`, `include/dict_random.h`, `include/dict_regexp.h`, `include/dict_sdbm.h`, `include/dict_sockmap.h`, `include/dict_sqlite.h`, `include/dict_static.h`, `include/dict_tcp.h`, `include/dict_test_helper.h`, `include/dict_thash.h`, `include/dict_union.h`, `include/dict_unix.h`, `include/dir_forest.h`, `include/dns.h`, `include/domain_list.h`, `include/dot_lockfile.h`, `include/dot_lockfile_as.h`, `include/dsb_scan.h`, `include/dsn.h`, `include/dsn_buf.h`, `include/dsn_filter.h`, `include/dsn_mask.h`, `include/dsn_print.h`, `include/dsn_util.h`, `include/dynamicmaps.h`, `include/edit_file.h`, `include/ehlo_mask.h`, `include/events.h`, `include/exec_command.h`, `include/ext_prop.h`, `include/file_id.h`, `include/find_inet.h`, `include/flush_clnt.h`, `include/fold_addr.h`, `include/format_tv.h`, `include/fsspace.h`, `include/fullname.h`, `include/get_domainname.h`, `include/get_hostname.h`, `include/haproxy_srvr.h`, `include/hash_fnv.h`, `include/header_body_checks.h`, `include/header_opts.h`, `include/header_token.h`, `include/hex_code.h`, `include/hex_quote.h`, `include/hfrom_format.h`, `include/host_port.h`, `include/htable.h`, `include/inet_addr_host.h`, `include/inet_addr_list.h`, `include/inet_addr_local.h`, `include/inet_addr_sizes.h`, `include/inet_prefix_top.h`, `include/inet_proto.h`, `include/info_log_addr_form.h`, `include/input_transp.h`, `include/int_filt.h`, `include/iostuff.h`, `include/ip_match.h`, `include/is_header.h`, `include/killme_after.h`, `include/known_tcp_ports.h`, `include/ldseed.h`, `include/lex_822.h`, `include/line_number.h`, `include/line_wrap.h`, `include/listen.h`, `include/load_file.h`, `include/load_lib.h`, `include/log_adhoc.h`, `include/login_sender_match.h`, `include/logwriter.h`, `include/lstat_as.h`, `include/mac_expand.h`, `include/mac_midna.h`, `include/mac_parse.h`, `include/mail_addr.h`, `include/mail_addr_crunch.h`, `include/mail_addr_find.h`, `include/mail_addr_form.h`, 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`src/util/inet_trigger.o`, `src/util/inet_windowsize.o`, `src/util/ip_match.o`, `src/util/killme_after.o`, `src/util/known_tcp_ports.o`, `src/util/ldseed.o`, `src/util/libutil.a`, `src/util/line_number.o`, `src/util/line_wrap.o`, `src/util/load_file.o`, `src/util/load_lib.o`, `src/util/logwriter.o`, `src/util/lowercase.o`, `src/util/lstat_as.o`, `src/util/mac_expand`, `src/util/mac_expand.o`, `src/util/mac_midna.o`, `src/util/mac_parse.o`, `src/util/make_dirs.o`, `src/util/mask_addr.o`, `src/util/match_list.o`, `src/util/match_ops.o`, `src/util/midna_domain.o`, `src/util/mkmap_cdb.o`, `src/util/mkmap_db.o`, `src/util/mkmap_dbm.o`, `src/util/mkmap_fail.o`, `src/util/mkmap_lmdb.o`, `src/util/mkmap_open.o`, `src/util/mkmap_sdbm.o`, `src/util/msg.o`, `src/util/msg_logger.o`, `src/util/msg_output.o`, `src/util/msg_rate_delay.o`, `src/util/msg_syslog.o`, `src/util/msg_vstream.o`, `src/util/mvect.o`, `src/util/myaddrinfo.o`, `src/util/myflock.o`, `src/util/mymalloc.o`, `src/util/myrand.o`, `src/util/mystrerror.o`, `src/util/mystrtok.o`, `src/util/name_code.o`, `src/util/name_mask.o`, `src/util/nbbio.o`, `src/util/netstring.o`, `src/util/neuter.o`, `src/util/non_blocking.o`, `src/util/normalize_v4mapped_addr.o`, `src/util/normalize_ws.o`, `src/util/nvtable.o`, `src/util/open_as.o`, `src/util/open_limit.o`, `src/util/open_lock.o`, `src/util/ossl_digest.o`, `src/util/pass_accept.o`, `src/util/pass_trigger.o`, `src/util/peekfd.o`, `src/util/poll_fd.o`, `src/util/posix_signals.o`, `src/util/printable.o`, `src/util/quote_for_json.o`, `src/util/rand_sleep.o`, `src/util/readlline.o`, `src/util/recv_pass_attr.o`, `src/util/ring.o`, `src/util/safe_getenv.o`, `src/util/safe_open.o`, `src/util/sane_accept.o`, `src/util/sane_basename.o`, `src/util/sane_connect.o`, `src/util/sane_link.o`, `src/util/sane_rename.o`, `src/util/sane_sockaddr_to_hostaddr.o`, `src/util/sane_socketpair.o`, `src/util/sane_strtol.o`, `src/util/sane_time.o`, `src/util/scan_dir.o`, `src/util/set_eugid.o`, `src/util/set_ugid.o`, `src/util/sigdelay.o`, `src/util/skipblanks.o`, `src/util/slmdb.o`, `src/util/sock_addr.o`, `src/util/spawn_command.o`, `src/util/split_at.o`, `src/util/split_nameval.o`, `src/util/split_qnameval.o`, `src/util/stat_as.o`, `src/util/strcasecmp_utf8.o`, `src/util/stream_connect.o`, `src/util/stream_listen.o`, `src/util/stream_recv_fd.o`, `src/util/stream_send_fd.o`, `src/util/stream_trigger.o`, `src/util/sys_compat.o`, `src/util/timecmp.o`, `src/util/timed_connect.o`, `src/util/timed_read.o`, `src/util/timed_wait.o`, `src/util/timed_write.o`, `src/util/translit.o`, `src/util/trimblanks.o`, `src/util/unescape.o`, `src/util/uni

[truncated 4607 bytes]

## Plan Pass

## Problem
Fixer observed `smtpd` with a stack in the SMTP input path: `smtp_get()` -> `smtp_get_noexcept()` -> `vstring_get_flags_bound()` -> `timed_read()` -> `poll_fd()` -> `poll()`. The same bundle reports `State: S (sleeping)`, `wchan: poll_schedule_timeout`, one `restart_syscall` over 5 seconds, and only `1.7%` sampled CPU. That does not establish a Postfix busy loop.

## Evidence Confidence
inferred

## Proposed Subject
No upstream source patch yet: diagnose `smtpd` poll-wait evidence as insufficient for a safe Postfix code change.

## Patch Plan
Do not edit source from this evidence. The collected signal is indirect/profiler-heavy and internally points to a blocked read path, not a proven runaway userspace loop.

Relevant conventions found: no `CONTRIBUTING`, `HACKING`, `README-hacking`, `README.md`, `docs/`, or `dev-docs`; repo guidance exists in `AAAREADME`, `TESTING`, `PORTING`, and `.indent.pro`. The touched subsystem uses Postfix wrappers: `VSTREAM`/`VSTRING`, `smtp_stream_setup()`, `smtp_timeout_reset()`, `smtp_get()`, `smtp_get_noexcept()`, `timed_read()`, `poll_fd()`, `msg_*()` logging, and `mymalloc()`/`myfree()` allocation. Any future patch should preserve those helpers and avoid raw libc I/O or avoidable `goto` control flow.

Prior Fixer work already produced a no-patch diagnosis; improve/replace it only with clearer maintainer-facing evidence limits and validation notes, not a speculative Debian-local workaround.

## Risks
A premature patch could weaken SMTP timeout/deadline behavior, especially `smtpd_timeout`, `smtpd_per_request_deadline`, and minimum data-rate accounting. The observed installed binary was `3.10.6-1`, while this workspace is `3.11.2`, so unsymbolized offsets may not map cleanly.

## Validation
Before any focused check, try from the workspace root: `make`, then `make check` if available. If `make check` is unavailable, try the project test entrypoint `make tests`.

If the project-level command fails because dependencies or generated files are missing, record the exact command and blocker, then fall back to the narrowest relevant target such as `make makefiles ... && make`, `make -C src/global test`, `make -C src/util test`, or `make -C src/smtpd test`.

Bounded independent reproduction attempt: after build, run a short local `smtpd` smoke/trace invocation matching the evidence command when sandbox permissio

[truncated]

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

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 0x00007f25577e97d2 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`, `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 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: 10.15% 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, 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[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: 12.28% of sampled CPU passed through kfree, 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.

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: 7.62% 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: 50.00% of sampled CPU passed through unresolved offset, 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 (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, 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-313.pyc, Makefile, Makefile.pre, Misc/python-config.sh, Misc/python-embed.pc, Misc/python.pc, Modules/Setup.bootstrap, Modules/Setup.local, Modules/Setup.stdlib, Modules/_abc.o, Modules/_asyncio.cpython-313-x86_64-linux-gnu.so, Modules/_asynciomodule.o, Modules/_bisect.cpython-313-x86_64-linux-gnu.so, Modules/_bisectmodule.o, Modules/_blake2.cpython-313-x86_64-linux-gnu.so, Modules/_blake2/blake2b_impl.o, Modules/_blake2/blake2mo

[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. 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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. 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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: 20.18% of sampled CPU passed through unresolved offset, with repeated thread backtraces show 2 thread(s) around 0x00007fa97251bffe in ?? () from target:<path> and 1 thread(s) around 0x00007fa970081594 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 `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: 8.20% 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

[truncated]

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: 100.00% of sampled CPU passed through _raw_spin_lock, 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. 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