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gh-117657: Fix QSBR race condition (#118843) 

`_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.
This commit is contained in:
Alex Turner 2024-05-10 15:26:35 +01:00 committed by GitHub
parent 22d5185308
commit 33d20199af
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GPG Key ID: B5690EEEBB952194
4 changed files with 8 additions and 8 deletions
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2
Include/internal/pycore_qsbr.h
View File

@ -140,7 +140,7 @@ _Py_qsbr_register(struct _PyThreadStateImpl *tstate,
// Disassociates a PyThreadState from the QSBR state and frees the QSBR state.
extern void
_Py_qsbr_unregister(struct _PyThreadStateImpl *tstate);
_Py_qsbr_unregister(PyThreadState *tstate);
extern void
_Py_qsbr_fini(PyInterpreterState *interp);

2
Python/pystate.c
View File

@ -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

11
Python/qsbr.c
View File

@ -231,20 +231,21 @@ _Py_qsbr_register(_PyThreadStateImpl *tstate, PyInterpreterState *interp,
}
void
_Py_qsbr_unregister(_PyThreadStateImpl *tstate)
_Py_qsbr_unregister(PyThreadState *tstate)
{
struct _qsbr_shared *shared = tstate->qsbr->shared;
struct _qsbr_shared *shared = &tstate->interp->qsbr;
struct _PyThreadStateImpl *tstate_imp = (_PyThreadStateImpl*) tstate;
PyMutex_Lock(&shared->mutex);
// NOTE: we must load (or reload) the thread state's qbsr inside the mutex
// because the array may have been resized (changing tstate->qsbr) while
// we waited to acquire the mutex.
struct _qsbr_thread_state *qsbr = tstate->qsbr;
struct _qsbr_thread_state *qsbr = tstate_imp->qsbr;
assert(qsbr->seq == 0 && "thread state must be detached");
assert(qsbr->allocated && qsbr->tstate == (PyThreadState *)tstate);
assert(qsbr->allocated && qsbr->tstate == tstate);
tstate->qsbr = NULL;
tstate_imp->qsbr = NULL;
qsbr->tstate = NULL;
qsbr->allocated = false;
qsbr->freelist_next = shared->freelist;

1
Tools/tsan/suppressions_free_threading.txt
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@ -38,7 +38,6 @@ race_top:_PyParkingLot_Park
race_top:_PyType_HasFeature
race_top:assign_version_tag
race_top:gc_restore_tid
race_top:initialize_new_array
race_top:insertdict
race_top:lookup_tp_dict
race_top:mi_heap_visit_pages