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[3.14] gh-137400: Fix thread-safety issues when profiling all threads (gh-137518) (gh-137730)

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There were a few thread-safety issues when profiling or tracing all
threads via PyEval_SetProfileAllThreads or PyEval_SetTraceAllThreads:

* The loop over thread states could crash if a thread exits concurrently
  (in both the free threading and default build)
* The modification of `c_profilefunc` and `c_tracefunc` wasn't
  thread-safe on the free threading build.
(cherry picked from commit a10152f8fd)

Co-authored-by: Sam Gross <colesbury@gmail.com>
Co-authored-by: Petr Viktorin <encukou@gmail.com>
This commit is contained in:
Sam Gross 2025-10-07 13:45:23 -04:00 • committed by GitHub
parent c1cb785ebd
commit fb699effbf
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11 changed files with 432 additions and 245 deletions
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Misc/NEWS.d/next/Core_and_Builtins/2025-08-07-09-52-19.gh-issue-137400.AK1dy-.rst Normal file
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Fix a crash in the :term:`free threading` build when disabling profiling or
tracing across all threads with :c:func:`PyEval_SetProfileAllThreads` or
:c:func:`PyEval_SetTraceAllThreads` or their Python equivalents
:func:`threading.settrace_all_threads` and
:func:`threading.setprofile_all_threads`.