gh-139116: tracemalloc: Detach thread state when acquiring tables_lock #139449
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…es_lock This prevents a deadlock when: - One thread is in `_PyTraceMalloc_Stop`, with `TABLES_LOCK` held, calling `PyRefTracer_SetTracer` which wants to stop the world - Another is thread in `PyTraceMalloc_Track`, just attached thread state, waiting for `TABLES_LOCK` Detaching the thread state while waiting for `TABLES_LOCK` allows `PyRefTracer_SetTracer` to stop the world.
Misc/NEWS.d/next/Core_and_Builtins/2025-09-30-14-57-19.gh-issue-139116.nlVf40.rst
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Co-authored-by: Peter Bierma <zintensitydev@gmail.com>
ZeroIntensity
approved these changes
Sep 30, 2025
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!buildbot Intel.ASAN.NoGIL |
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🤖 New build scheduled with the buildbot fleet by @encukou for commit add31a7 🤖 Results will be shown at: https://buildbot.python.org/all/#/grid?branch=refs%2Fpull%2F139449%2Fmerge The command will test the builders whose names match following regular expression: The builders matched are:
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This prevents a deadlock when:
_PyTraceMalloc_Stop, withTABLES_LOCKheld, callingPyRefTracer_SetTracerwhich wants to stop the worldPyTraceMalloc_Track, just attached thread state, waiting forTABLES_LOCKDetaching the thread state while waiting for
TABLES_LOCKallowsPyRefTracer_SetTracerto stop the world.