STINNER Victor <victor.stin...@gmail.com> added the comment:

While the commit b484d5606ca76f9bbd0f5de7a6ef753400213e94 fixes a crash on 
OpenBSD and makes the code "correct" on any platforms, I still see it as a 
feature regression. Detecting buffer overflow and using freed memory are 
feature of debug hooks.

https://docs.python.org/dev/c-api/memory.html#c.PyMem_SetupDebugHooks

So yes, debug-realloc.diff is interesting.

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<https://bugs.python.org/issue31626>
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