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[3.13] gh-117657: Fix TSAN race in QSBR assertion (GH-119887) (#119904) 

Due to a limitation in TSAN, all reads from `PyThreadState.state` must be
atomic to avoid reported races.
(cherry picked from commit 90ec19fd33)

Co-authored-by: Sam Gross <colesbury@gmail.com>
This commit is contained in:
Miss Islington (bot) 2024-06-01 16:51:55 +02:00 committed by GitHub
parent 48f3378d6c
commit 48054d2306
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GPG Key ID: B5690EEEBB952194
2 changed files with 2 additions and 3 deletions
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3
Python/qsbr.c
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@ -160,7 +160,8 @@ qsbr_poll_scan(struct _qsbr_shared *shared)
bool
_Py_qsbr_poll(struct _qsbr_thread_state *qsbr, uint64_t goal)
{
assert(_PyThreadState_GET()->state == _Py_THREAD_ATTACHED);
assert(_Py_atomic_load_int_relaxed(&_PyThreadState_GET()->state) == _Py_THREAD_ATTACHED);
if (_Py_qbsr_goal_reached(qsbr, goal)) {
return true;
}

2
Tools/tsan/suppressions_free_threading.txt
View File

@ -76,8 +76,6 @@ race_top:_PyFrame_GetCode
race_top:_PyFrame_Initialize
race_top:PyInterpreterState_ThreadHead
race_top:_PyObject_TryGetInstanceAttribute
race_top:_Py_qsbr_unregister
race_top:_Py_qsbr_poll
race_top:PyThreadState_Next
race_top:Py_TYPE
race_top:PyUnstable_InterpreterFrame_GetLine