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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"`PyEval_GetFrame` crashes when it returns incomplete frames","articleBody":"Is it possible that `PyEval_GetFrame`  returns incomplete frames. When this happens, Python segfaults in release mode or crashes in debug mode because of the check for incomplete frames in `_PyFrame_GetFrameObject`. This is reproducible in many ways involving C extensions, the easier one may be by installing a custom memory allocator for all the domains and calling `PyEval_GetFrame`  from there. As the allocator can be called at random points of the eval loop (for example [here](https://github.com/python/cpython/blob/a3e2f054d285d72bca97667390bbc219d02ab364/Python/ceval.c#L6231)) is perfectly possible that a legitimate call to `PyEval_GetFrame` returns an incomplete frame.","author":{"url":"https://github.com/pablogsal","@type":"Person","name":"pablogsal"},"datePublished":"2022-09-20T22:58:47.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":21},"url":"https://github.com/96975/cpython/issues/96975"}