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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Fatal Python error from `warnings._release_lock()`","articleBody":"# Crash report\n\n### What happened?\n\nExposing the mutex  used by the `_warnings` module in https://github.com/python/cpython/pull/128386 has made it possible to abort the interpreter by calling `warnings._release_lock()`:\n\n```python\nimport warnings\nwarnings._release_lock()\n```\n\nError message:\n```\nFatal Python error: _PyRecursiveMutex_Unlock: unlocking a recursive mutex that is not owned by the current thread\nPython runtime state: initialized\n\nCurrent thread 0x0000718eb9295740 (most recent call first):\n  File \"\u003cstring\u003e\", line 1 in \u003cmodule\u003e\nAborted (core dumped)\n```\n\nFound using [fusil](https://github.com/devdanzin/fusil) by @vstinner.\n\n### CPython versions tested on:\n\nCPython main branch, 3.14\n\n### Operating systems tested on:\n\nLinux\n\n### Output from running 'python -VV' on the command line:\n\nPython 3.14.0a4+ (heads/main:e1006ce1de, Feb  6 2025, 17:22:01) [GCC 13.3.0]\n\n\u003c!-- gh-linked-prs --\u003e\n### Linked PRs\n* gh-129771\n\u003c!-- /gh-linked-prs --\u003e\n","author":{"url":"https://github.com/devdanzin","@type":"Person","name":"devdanzin"},"datePublished":"2025-02-07T03:31:38.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":3},"url":"https://github.com/129766/cpython/issues/129766"}