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Title: instrumentation.c: Use-after-Py_DECREF comparison in call_one_instrument · Issue #151524 · python/cpython · GitHub

Open Graph Title: instrumentation.c: Use-after-Py_DECREF comparison in call_one_instrument · Issue #151524 · python/cpython

X Title: instrumentation.c: Use-after-Py_DECREF comparison in call_one_instrument · Issue #151524 · python/cpython

Description: Bug report Bug description: Summary At line 992-993, Py_DECREF(res) then res compared to &_PyInstrumentation_DISABLE. Using a potentially-freed pointer in comparison is UB per C standard. This is a sub-issue of #146102 with gist details ...

Open Graph Description: Bug report Bug description: Summary At line 992-993, Py_DECREF(res) then res compared to &_PyInstrumentation_DISABLE. Using a potentially-freed pointer in comparison is UB per C standard. This is a...

X Description: Bug report Bug description: Summary At line 992-993, Py_DECREF(res) then res compared to &_PyInstrumentation_DISABLE. Using a potentially-freed pointer in comparison is UB per C standard. This ...

Opengraph URL: https://github.com/python/cpython/issues/151524

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instrumentation.c: Use-after-Py_DECREF comparison in call_one_instrumenthttps://github.com/python/cpython/issues/151524#top
interpreter-core(Objects, Python, Grammar, and Parser dirs)https://github.com/python/cpython/issues?q=state%3Aopen%20label%3A%22interpreter-core%22
type-bugAn unexpected behavior, bug, or errorhttps://github.com/python/cpython/issues?q=state%3Aopen%20label%3A%22type-bug%22
https://github.com/lpyu001
lpyu001https://github.com/lpyu001
on Jun 16, 2026https://github.com/python/cpython/issues/151524#issue-4670564336
#146102https://github.com/python/cpython/issues/146102
gist detailshttps://gist.github.com/devdanzin/330026d6a4c40048c771a61f706ac75e
gh-151524: Avoid using instrumentation callback result after Py_DECREF #151525https://github.com/python/cpython/pull/151525
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