python3.13 likely remains stuck in a busy-poll loop. A diagnosis report and patch proposal were created locally.
Published session
Prompt
## Plan Pass
You are planning a fixer patch before any edits happen.
Read the evidence bundle at `./evidence.json`. The prepared workspace is `./workspace` and it was acquired via `debian-source`. The original pre-edit snapshot is available at `./source` if you need to inspect it. For interpreter processes, plan from the script/application entrypoint evidence first and include the runtime only as a second investigation target unless the evidence proves a runtime bug.
Validation expectation: try the project-level build/test entrypoint from the workspace root before reporting only a focused leaf compile. Detected candidate(s): `./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]
Response
## Plan Pass
## Problem
Fixer observed `/usr/bin/python3 /usr/bin/supervisord -n -c /etc/supervisor/supervisord.conf` under `/usr/bin/python3.13` with repeated `wait4(-1, ..., WNOHANG) = ECHILD` followed by `poll(..., 1000) = 0`. The sampled process state was sleeping in `poll_schedule_timeout`, so the evidence does not currently show a CPython tight busy loop or a runtime API defect.
## Evidence Confidence
inferred
## Proposed Subject
No CPython source patch yet: diagnose this as likely application-level `supervisord` event-loop polling unless an independent reproduction ties the behavior to CPython’s `select.poll`, `selectors`, `subprocess`, or wait handling.
## Patch Plan
Do not edit CPython in this pass. The command-line evidence names `supervisord` as the script/application entrypoint, while the runtime appears only as the interpreter hosting it.
Relevant CPython code checked: `Modules/selectmodule.c` uses `_PyTime_*` helpers, `Py_BEGIN_ALLOW_THREADS`, EINTR retry handling, and avoids concurrent `poll()` invocation; `Lib/selectors.py` intentionally rounds positive poll timeouts up to milliseconds; `Lib/subprocess.py` uses `_waitpid_lock` around nonblocking `waitpid(..., WNOHANG)`. No local CPython helper was found that would obviously be missing from the observed path.
Contribution/style docs checked: top-level `README.rst` points to the CPython Developer Guide and documents `./configure`, `make`, and `make test`; Debian `README.source` says packaging patches use quilt. Debian patches are present, but I found no prior Fixer patch for this finding to improve or replace.
If later evidence shows a CPython bug, keep any patch upstream-style in the CPython subsystem, avoid awkward control flow such as avoidable `goto`, follow existing `_PyTime_*`, `PyErr_SetFromErrno`, EINTR, and GIL-release conventions, and add a focused regression test only for a demonstrated runtime behavior.
## Risks
A CPython patch based only on this bundle would likely “fix” normal supervisor behavior: a one-second timeout loop that checks for child exits. Changing `select.poll`, `selectors`, or `subprocess` without a runtime reproducer risks breaking documented timeout and child-process semantics.
Because this touches timing/polling behavior, any source patch would need reproducible behavior and impact analysis first. Current evidence is profiler/trace-only and does not justify a security-sensitive timing change.
## Validation
Before any justified edit, 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 failure, then use the narrowest relevant check, likely a focused compile of `Modules/selectmodule.c` through the project build target or a targeted `make test TESTOPTS="-v test_select test_selectors test_subprocess"` after a successful build.
Bounded independent evidence attempt before editing: run a local Python smoke check that performs `os.waitpid(-1, os.WNOHANG)` with no children and `select.poll().poll(1000)` on an idle fd under `strace -e poll,wait4` to compare the syscall cadence. This can show whether the collected signal is ordinary CPython API behavior, but it should not be claimed as reproducing the reported runaway CPU unless it actually demonstrates sustained CPU usage.
## Patch Pass
Subject: Diagnose supervisord poll loop without CPython changes
## Commit Message
No source change is included. The collected evidence shows `supervisord` running under Python and repeatedly doing a nonblocking child-status check followed by a one-second blocking `poll()`. That pattern is consistent with an application event loop, not with a demonstrated CPython runtime bug.
## Evidence Confidence
inferred
## Issue Connection
The likely root cause from the collected perf, strace, and `/proc` evidence is that `supervisord` is waking once per second to check for child processes, then blocking again in `poll()`. The exact collected signal was repeated `wait4(-1, ..., WNOHANG) = -1 ECHILD` followed by `poll(..., 1000) = 0` taking about `1.001` seconds, while `/proc` reported the sampled thread in sleeping state `S` and kernel wait channel `poll_schedule_timeout`.
The cautious code-level inference is that the trace is showing normal Python-exposed OS behavior rather than a CPython busy-poll defect. I inspected the relevant CPython paths: `Modules/selectmodule.c` uses `_PyTime_*` deadline helpers, releases the GIL with `Py_BEGIN_ALLOW_THREADS`, and only retries `poll()` on `EINTR`; `Lib/selectors.py` rounds positive poll timeouts up to milliseconds; `Lib/subprocess.py` protects nonblocking child polling with `_waitpid_lock`. No relevant missing local helper was found.
I made no source change because this is timing/polling behavior and the evidence does not reproduce a CPython bug. The expected effect is that no speculative runtime behavior change is proposed until stronger evidence ties the CPU report to CPython rather than to the application loop.
I followed the saved plan at `plan-output.txt`; the code and validation did not prove a reason to change course.
## Git Add Paths
None
## Validation
Checked contribution/style guidance and subsystem conventions: top-level `README.rst` points to the CPython Developer Guide and documents `./configure`, `make`, and `make test`; `debian/README.source` says Debian packaging uses quilt. The relevant subsystem uses `_PyTime_*`, `Py_BEGIN_ALLOW_THREADS`, `PyErr_SetFromErrno`, selector timeout rounding, and `_waitpid_lock`.
Ran project-level build entrypoint from workspace root:
```sh
./configure && make
```
Result: exited `0`. Build reported optional `_dbm`, `_gdbm`, and `_tkinter` missing, and `_ssl` failed import with `undefined symbol: TLSv1_method`, but the command completed successfully.
Attempted bounded independent syscall reproduction:
```sh
strace -tt -e trace=poll,wait4 ./python -S - ...
```
Result: blocked by sandbox ptrace restrictions: `PTRACE_TRACEME: Operation not permitted` and `ptrace(PTRACE_SEIZE, 5): Operation not permitted`.
Ran no-ptrace timing smoke check with the same Python-level operations:
```sh
./python -S - <<'PY'
import os, select, time
r, w = os.pipe()
try:
p = select.poll()
p.register(r, select.POLLIN | select.POLLPRI | select.POLLHUP)
wall_start = time.monotonic()
cpu_start = time.process_time()
echild = 0
for _ in range(5):
try:
os.waitpid(-1, os.WNOHANG)
except ChildProcessError:
echild += 1
p.poll(1000)
print(f"echild={echild} wall={time.monotonic() - wall_start:.3f} cpu={time.process_time() - cpu_start:.6f}")
finally:
os.close(r)
os.close(w)
PY
```
Result: `echild=5 wall=5.005 cpu=0.000199`, which supports the diagnosis that the observed one-second poll cadence blocks rather than spins.
## 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`, `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`, 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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: Diagnose supervisord poll loop without CPython changes
## Commit Message
No CPython source change is included. The collected evidence shows `supervisord` waking once per second to check child status and then blocking in `poll()`, which is consistent with an application event loop rather than a demonstrated CPython runtime defect. This refinement addresses the review finding by removing generated validation artifacts from the workspace.
## Evidence Confidence
inferred
## Issue Connection
The collected signal was `/usr/bin/python3 /usr/bin/supervisord -n -c /etc/supervisor/supervisord.conf` repeatedly calling `wait4(-1, ..., WNOHANG)` and receiving `ECHILD`, then calling `poll(..., 1000)` and timing out after about one second. `/proc` evidence showed the sampled thread in sleeping state `S` with wait channel `poll_schedule_timeout`, so the trace does not show a tight zero-timeout spin.
The cautious code-level inference is that CPython is exposing normal OS polling behavior. I rechecked the relevant CPython paths: `Modules/selectmodule.c` uses `_PyTime_*` timeout helpers, `Py_BEGIN_ALLOW_THREADS`, and EINTR retry handling; `Lib/selectors.py` rounds positive timeouts to poll’s millisecond granularity; `Lib/subprocess.py` uses `_waitpid_lock` around nonblocking child waits. No missing local helper or compatibility wrapper was found.
I made no source change. In this refinement, I removed the generated build and bytecode artifacts called out by review so `## Git Add Paths` remains consistent with the no-patch diagnosis. The expected effect is that no speculative timing-sensitive CPython change is proposed until stronger evidence ties the reported CPU use to a runtime bug rather than to the `supervisord` loop.
## Git Add Paths
None
## Validation
Reviewed the prior plan, author response, review report, and evidence bundle. The review finding was metadata drift from generated files; I addressed it by cleaning validation artifacts. `git clean -fdx` removed the build outputs and pycache files, with warnings that `.agents/` and `.codex/` were busy; final `git status --short` and `git diff --stat` produced no output.
Checked contribution/style guidance and subsystem conventions again. `README.rst` points to the CPython Developer Guide and documents `./configure`, `make`, and `make test`; `debian/README.source` says Debian packaging uses quilt. The relevant local conventions remain `_PyTime_*`, `Py_BEGIN_ALLOW_THREADS`, EINTR handling, selector timeout rounding, and `_waitpid_lock`.
Project-level validation from the previous authoring pass was:
```sh
./configure && make
```
Result: exited `0`; optional `_dbm`, `_gdbm`, and `_tkinter` were missing, and `_ssl` failed import with `undefined symbol: TLSv1_method`, but the command completed successfully. I did not rerun it in this refinement because no source changed and rerunning it would recreate the generated artifacts that the review explicitly asked to remove.
The bounded syscall reproduction attempt from the previous pass was blocked by sandbox ptrace restrictions:
```sh
strace -tt -e trace=poll,wait4 ./python -S - ...
```
Result: `PTRACE_TRACEME: Operation not permitted` and `ptrace(PTRACE_SEIZE, 5): Operation not permitted`.
The no-ptrace timing smoke check from the previous pass completed with:
```text
echild=5 wall=5.005 cpu=0.000199
```
That supports the diagnosis that this one-second poll cadence blocks rather than spins.
## Review Pass 2
RESULT: ok
No actionable issues found.
The refined workspace is clean: `git status --short`, `git diff --stat`, and `git diff --name-only` show no changed paths, matching `## Git Add Paths: None`. The previous review’s metadata drift finding is resolved.
The no-patch diagnosis is consistent with the evidence level. The author uses `inferred`, does not claim a reproduced CPython bug, and avoids proposing a timing-sensitive runtime change from indirect perf/strace evidence. The explanation connects the collected `wait4(..., WNOHANG) = ECHILD` plus one-second `poll(..., 1000)` cadence to normal application-level event-loop behavior, and it names the relevant CPython conventions/helpers checked: `_PyTime_*`, `Py_BEGIN_ALLOW_THREADS`, EINTR handling, selector timeout rounding, and `_waitpid_lock`.
Validation text is acceptable for a no-source-change refinement: the prior project-level `./configure && make` was reported, the blocked `strace` reproduction was disclosed with the ptrace error, and the refinement explains why rerunning the build would recreate the artifacts that were just cleaned.