Crash report

What happened?

Exposing the mutex used by the_warnings module in#128386 has made it possible to abort the interpreter by callingwarnings._release_lock():

importwarningswarnings._release_lock()

Error message:

Fatal Python error: _PyRecursiveMutex_Unlock: unlocking a recursive mutex that is not owned by the current threadPython runtime state: initializedCurrent thread 0x0000718eb9295740 (most recent call first):  File "<string>", line 1 in <module>Aborted (core dumped)

Found usingfusil by@vstinner.

CPython versions tested on:

CPython main branch, 3.14

Operating systems tested on:

Linux

Output from running 'python -VV' on the command line:

Python 3.14.0a4+ (heads/main:e1006ce1de, Feb 6 2025, 17:22:01) [GCC 13.3.0]

Linked PRs

• gh-129766: Fix crash on callingwarnings._release_lock with no lock #129771