[issue44184] crash on windows invoking flake8

[STINNER Victor]

STINNER Victor <vstinner at python.org> added the comment:

Apply attached debug_subtype_dealloc.patch to reproduce the issue on Linux with attached ref.py script:

$ ./python ref.py 
exit
subtype_dealloc(_ABC): call basedealloc() with Py_REFCNT(type)=1
subtype_dealloc(_Precedence): call basedealloc() with Py_REFCNT(type)=1
subtype_dealloc(property): call basedealloc() with Py_REFCNT(type)=1
subtype_dealloc(FlagBoundary): call basedealloc() with Py_REFCNT(type)=1
LAST GC
Cycle.__del__
Cycle.__del__
subtype_dealloc(keyword): call basedealloc() with Py_REFCNT(type)=1
python: Objects/typeobject.c:1462: subtype_dealloc: Assertion `!_PyMem_IsPtrFreed(type->tp_name)' failed.
Abandon (core dumped)

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Added file: https://bugs.python.org/file50055/ref.py

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue44184>
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