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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"`PyFrame_GetBack` segfaults if called in a `sys.settrace` hook on `3.11.1`","articleBody":"# Crash report\r\n\r\nWhen `PyFrame_GetBack` is called during a `sys.settrace` hook in a C extension, it segfaults for some libraries(`spacy`)\r\nFollowing is a reproducer: https://gist.github.com/sumerc/b254f38c5a620b8d47aba7398b3c7791. \r\n\r\n# Error messages\r\n\r\nEnter any relevant error message caused by the crash, including a core dump if there is one. \r\n\r\nA gdb stack trace: (for more information: the last frame executed was `\u003cframe at 0x7fffd25b2d40, file 'thinc/backends/numpy_ops.pyx', line 1, code __Pyx_PyMODINIT_FUNC PyInit_numpy_ops(void)\u003e`) I also have another application that crashes at the same point but with a different frame: `\u003cframe at 0x7ff6568e4520, file 'stringsource', line 282, code __init__\u003e`. The interesting part is both are Cython functions. Might there be something related with Cython?\r\n\r\n```\r\nThread 1 \"python\" received signal SIGSEGV, Segmentation fault.\r\n0x00007ffff767a548 in _PyFrame_IsIncomplete (frame=0xcdcdcdcdcdcdcdcd) at ./Include/internal/pycore_frame.h:147\r\n147     ./Include/internal/pycore_frame.h: No such file or directory.\r\n(gdb) bt\r\n#0  0x00007ffff767a548 in _PyFrame_IsIncomplete (frame=0xcdcdcdcdcdcdcdcd) at ./Include/internal/pycore_frame.h:147\r\n#1  0x00007ffff767d9e7 in PyFrame_GetBack (frame=0x7fffd03ef120) at Objects/frameobject.c:1326\r\n#2  0x00007ffff60e7bce in PyTraceFunction (obj=0x0, frame=0x7fffd03ef120, what=0, arg=0x0) at main.c:33\r\n#3  0x00007fffd02db71b in ?? () from /home/supo/.pyenv/versions/3.11.1-debug/lib/python3.11/site-packages/thinc/backends/[numpy_ops.cpython-311-x86_64-linux-gnu.so](http://numpy_ops.cpython-311-x86_64-linux-gnu.so/)\r\n#4  0x00007fffd02d4697 in ?? () from /home/supo/.pyenv/versions/3.11.1-debug/lib/python3.11/site-packages/thinc/backends/[numpy_ops.cpython-311-x86_64-linux-gnu.so](http://numpy_ops.cpython-311-x86_64-linux-gnu.so/)\r\n#5  0x00007ffff76bab22 in PyModule_ExecDef (module=0x7fffd16273b0, def=0x7fffd038ba60) at Objects/moduleobject.c:419\r\n#6  0x00007ffff77f38ec in exec_builtin_or_dynamic (mod=0x7fffd16273b0) at Python/import.c:2333\r\n#7  0x00007ffff77f3ab8 in _imp_exec_dynamic_impl (module=0x7ffff7f83bf0, mod=0x7fffd16273b0) at Python/import.c:2407\r\n#8  0x00007ffff77ef0b0 in _imp_exec_dynamic (module=0x7ffff7f83bf0, mod=0x7fffd16273b0) at Python/clinic/import.c.h:474\r\n#9  0x00007ffff76b9170 in cfunction_vectorcall_O (func=0x7ffff7f882f0, args=0x7fffd03e1ff8, nargsf=1, kwnames=0x0) at Objects/methodobject.c:514\r\n#10 0x00007ffff764bf31 in _PyVectorcall_Call (tstate=0x7ffff7d8ba38 \u003c_PyRuntime+166328\u003e, func=0x7ffff76b9065 \u003ccfunction_vectorcall_O\u003e, callable=0x7ffff7f882f0,\r\n    tuple=0x7fffd03e1fe0, kwargs=0x7fffd03fc4d0) at Objects/call.c:245\r\n#11 0x00007ffff764c2d9 in _PyObject_Call (tstate=0x7ffff7d8ba38 \u003c_PyRuntime+166328\u003e, callable=0x7ffff7f882f0, args=0x7fffd03e1fe0, kwargs=0x7fffd03fc4d0)\r\n    at Objects/call.c:328\r\n#12 0x00007ffff764c3cb in PyObject_Call (callable=0x7ffff7f882f0, args=0x7fffd03e1fe0, kwargs=0x7fffd03fc4d0) at Objects/call.c:355\r\n#13 0x00007ffff77b4158 in do_call_core (tstate=0x7ffff7d8ba38 \u003c_PyRuntime+166328\u003e, func=0x7ffff7f882f0, callargs=0x7fffd03e1fe0, kwdict=0x7fffd03fc4d0,\r\n    use_tracing=255) at Python/ceval.c:7329\r\n```\r\n\r\n# Your environment\r\n\r\nI have reproduced same error for Python `3.11.0rc1` on `Ubuntu 18.04`/`x86/64` and a Mac M1. (The same code runs fine on `3.9`)\r\n\r\nUpdate: Reproduced the segfault with `3.11.1` final release, too.\r\n\r\n@pablogsal, Any idea?","author":{"url":"https://github.com/sumerc","@type":"Person","name":"sumerc"},"datePublished":"2022-12-26T14:37:53.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":10},"url":"https://github.com/100536/cpython/issues/100536"}