[3.13] gh-137400: Fix a crash when disabling profiling across all threads (gh-137471)#137649
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colesbury merged 1 commit intopython:3.13python/cpython:3.13from Aug 11, 2025
colesbury:backport-3626928-3.13colesbury/cpython:backport-3626928-3.13Copy head branch name to clipboard
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[3.13] gh-137400: Fix a crash when disabling profiling across all threads (gh-137471)#137649colesbury merged 1 commit intopython:3.13python/cpython:3.13from colesbury:backport-3626928-3.13colesbury/cpython:backport-3626928-3.13Copy head branch name to clipboard
colesbury merged 1 commit intopython:3.13python/cpython:3.13from
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…ll threads (pythongh-137471) The `PyEval_SetProfileAllThreads` function and other related functions had a race condition on `tstate->c_profilefunc` that could lead to a crash when disable profiling or tracing on all threads while another thread is starting to profile or trace a a call. There are still potential crashes when threads exit concurrently with profiling or tracing be enabled/disabled across all threads. (cherry picked from commit 3626928) Co-authored-by: Sam Gross <colesbury@gmail.com>
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The
PyEval_SetProfileAllThreadsfunction and other related functions had a race condition ontstate->c_profilefuncthat could lead to a crash when disable profiling or tracing on all threads while another thread is starting to profile or trace a a call.There are still potential crashes when threads exit concurrently with profiling or tracing be enabled/disabled across all threads.
(cherry picked from commit 3626928)
sys._setprofileallthreadsrace condition #137400