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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"`sys.audit(0)` aborts due to an assertion in debug build","articleBody":"# Crash report\n\n### What happened?\n\nThere is an assert in `sysmodule.c` that makes the interpreter abort when calling `sys.audit` with a non-string value in debug builds:\nhttps://github.com/python/cpython/blob/f6cc7c8bd01d8468af70a65e550abef3854d0754/Python/sysmodule.c#L522\n\n```python\nPython 3.14.0a1+ (heads/main:c5b99f5c2c, Oct 26 2024, 12:35:53) [GCC 13.2.0] on linux\nType \"help\", \"copyright\", \"credits\" or \"license\" for more information.\n\u003e\u003e\u003e import sys\n\u003e\u003e\u003e sys.audit(9)\npython: ./Python/sysmodule.c:522: sys_audit: Assertion `PyUnicode_Check(args[0])' failed.\nAborted (core dumped)\n```\n\nThis assert seems completely unnecessary, as the code that runs the hooks (which only triggers if there is some hook registered) will raise an exception if the first argument to `sys.audit` isn't a string:\n\n```python\nPython 3.14.0a1+ (heads/remove_sysaudit_assert:ba8ac4d398, Oct 26 2024, 19:45:11) [GCC 11.4.0] on linux\nType \"help\", \"copyright\", \"credits\" or \"license\" for more information.\n\u003e\u003e\u003e import sys\n\u003e\u003e\u003e sys.addaudithook(lambda *args: None)\n\u003e\u003e\u003e sys.audit(9)\nTraceback (most recent call last):\n  File \"\u003cpython-input-2\u003e\", line 1, in \u003cmodule\u003e\n    sys.audit(9)\n    ~~~~~~~~~^^^\nTypeError: expected str for argument 'event', not int\n```\n\nI'll submit a trivial PR removing this assert.\n\n### CPython versions tested on:\n\nCPython main branch\n\n### Operating systems tested on:\n\nLinux, Windows\n\n### Output from running 'python -VV' on the command line:\n\nPython 3.14.0a1+ (heads/main:c5b99f5c2c, Oct 26 2024, 12:35:53) [GCC 13.2.0]\n\n\u003c!-- gh-linked-prs --\u003e\n### Linked PRs\n* gh-126020\n* gh-126042\n\u003c!-- /gh-linked-prs --\u003e\n","author":{"url":"https://github.com/devdanzin","@type":"Person","name":"devdanzin"},"datePublished":"2024-10-26T22:49:06.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":3},"url":"https://github.com/126018/cpython/issues/126018"}