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Title: [3.14] gh-148820: Fix _PyRawMutex use-after-free on spurious semaphore wakeup (gh-148852) by colesbury · Pull Request #148884 · python/cpython · GitHub

Open Graph Title: [3.14] gh-148820: Fix _PyRawMutex use-after-free on spurious semaphore wakeup (gh-148852) by colesbury · Pull Request #148884 · python/cpython

X Title: [3.14] gh-148820: Fix _PyRawMutex use-after-free on spurious semaphore wakeup (gh-148852) by colesbury · Pull Request #148884 · python/cpython

Description: _PyRawMutex_UnlockSlow CAS-removes the waiter from the list and then calls _PySemaphore_Wakeup, with no handshake. If _PySemaphore_Wait returns Py_PARK_INTR, the waiter can destroy its stack-allocated semaphore before the unlocker's Wakeup runs, causing a fatal error from ReleaseSemaphore / sem_post. Loop in _PyRawMutex_LockSlow until _PySemaphore_Wait returns Py_PARK_OK, which is only signalled when a matching Wakeup has been observed. Also include GetLastError() and the handle in the Windows fatal messages in _PySemaphore_Init, _PySemaphore_Wait, and _PySemaphore_Wakeup to make similar races easier to diagnose in the future. (cherry picked from commit ad3c5b7) Issue: gh-148820

Open Graph Description: _PyRawMutex_UnlockSlow CAS-removes the waiter from the list and then calls _PySemaphore_Wakeup, with no handshake. If _PySemaphore_Wait returns Py_PARK_INTR, the waiter can destroy its stack-alloca...

X Description: _PyRawMutex_UnlockSlow CAS-removes the waiter from the list and then calls _PySemaphore_Wakeup, with no handshake. If _PySemaphore_Wait returns Py_PARK_INTR, the waiter can destroy its stack-alloca...

Opengraph URL: https://github.com/python/cpython/pull/148884

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b4ea1bc [3.14] gh-148820: Fix _PyRawMutex use-after-free on spurious semaphor… colesbury Apr 22, 2026 https://github.com/python/cpython/pull/148884/commits/b4ea1bce9a8a0a1fc7203db934e8466f677790ba
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