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gh-139116: tracemalloc: Detach thread state when acquiring tables_lock #139449

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Merged
merged 3 commits into from
Sep 30, 2025
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gh-139116: tracemalloc: Detach thread state when acquiring tables_lock #139449

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gh-139116: tracemalloc: Detach thread state when acquiring tables_lock
encukou Sep 30, 2025
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encukou Sep 30, 2025
add31a7
Use PyMutex_Lock
encukou Sep 30, 2025
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2 changes: 2 additions & 0 deletions Misc/NEWS.d/next/Core_and_Builtins/2025-09-30-14-57-19.gh-issue-139116.nlVf40.rst
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Original file line number Diff line number Diff line change
@@ -0,0 +1,2 @@
Prevent a deadlock when multiple threads start, stop and use :mod:`tracemalloc`
simultaneously.
2 changes: 1 addition & 1 deletion Python/tracemalloc.c
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Expand Up @@ -36,7 +36,7 @@ static int _PyTraceMalloc_TraceRef(PyObject *op, PyRefTracerEvent event,
the GIL held from PyMem_RawFree(). It cannot acquire the lock because it
would introduce a deadlock in _PyThreadState_DeleteCurrent(). */
#define tables_lock _PyRuntime.tracemalloc.tables_lock
#define TABLES_LOCK() PyMutex_LockFlags(&tables_lock, _Py_LOCK_DONT_DETACH)
#define TABLES_LOCK() PyMutex_Lock(&tables_lock)
#define TABLES_UNLOCK() PyMutex_Unlock(&tables_lock)


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