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gh-117657: Fix TSAN race in QSBR assertion (#119887) 

Due to a limitation in TSAN, all reads from `PyThreadState.state` must be
atomic to avoid reported races.
This commit is contained in:
Sam Gross 2024-06-01 10:04:38 -04:00 committed by GitHub
parent 60593b2052
commit 90ec19fd33
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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

@ -75,8 +75,6 @@ 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