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[3.13] gh-117657: Fix QSBR race condition (GH-118843) (#118905)

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`_Py_qsbr_unregister` is called when the PyThreadState is already
detached, so the access to `tstate->qsbr` isn't safe without locking the
shared mutex. Grab the `struct _qsbr_shared` from the interpreter
instead.
(cherry picked from commit 33d20199af)

Co-authored-by: Alex Turner <alexturner@meta.com>
This commit is contained in:
Miss Islington (bot) 2024-05-10 17:13:17 +02:00 • committed by GitHub
parent 0874a400a8
commit 0becae366c
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4 changed files with 8 additions and 8 deletions
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Python/pystate.c
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@ -1794,7 +1794,7 @@ tstate_delete_common(PyThreadState *tstate)
HEAD_UNLOCK(runtime);
#ifdef Py_GIL_DISABLED
_Py_qsbr_unregister((_PyThreadStateImpl *)tstate);
_Py_qsbr_unregister(tstate);
#endif
// XXX Unbind in PyThreadState_Clear(), or earlier