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gh-139116: tracemalloc: Detach thread state when acquiring tables_lock (GH-139449)

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* gh-139116: tracemalloc: Detach thread state when acquiring tables_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.


Co-authored-by: Peter Bierma <zintensitydev@gmail.com>
This commit is contained in:
Petr Viktorin
2025-09-30 16:43:49 +02:00
committed by GitHub
parent b2f5ad0c6d
commit 01157e0cdf
2 changed files with 3 additions and 1 deletions
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Misc/NEWS.d/next/Core_and_Builtins/2025-09-30-14-57-19.gh-issue-139116.nlVf40.rst Normal file
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Prevent a deadlock when multiple threads start, stop and use :mod:`tracemalloc`
simultaneously.