gh-117657: Quiet TSAN warning about a data race between start_the_world() and tstate_try_attach()#117828
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colesbury merged 2 commits intopython:mainfrom Apr 15, 2024
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…`tstate_try_attach()` TSAN erroneously reports a data race between the `_Py_atomic_compare_exchange_int` on `tstate->state` in `tstate_try_attach()` and the non-atomic load of `tstate->state` in `start_the_world`. The `_Py_atomic_compare_exchange_int` fails, but TSAN erroneously treats it as a store.
colesbury
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mpage
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Apr 16, 2024
The underlying races were fixed in pythongh-117830 and pythongh-117828
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…the_world()` and `tstate_try_attach()` (python#117828) TSAN erroneously reports a data race between the `_Py_atomic_compare_exchange_int` on `tstate->state` in `tstate_try_attach()` and the non-atomic load of `tstate->state` in `start_the_world`. The `_Py_atomic_compare_exchange_int` fails, but TSAN erroneously treats it as a store.
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TSAN erroneously reports a data race (example) between the
_Py_atomic_compare_exchange_intontstate->stateintstate_try_attach():cpython/Python/pystate.c
Lines 1993 to 1995 in 069de14
and the non-atomic load of
tstate->stateinstart_the_world():cpython/Python/pystate.c
Line 2251 in 069de14
The
_Py_atomic_compare_exchange_intfails, but TSAN erroneously treats it as a store.