[issue12149] Segfault in _PyObject_GenericGetAttrWithDict

[Mark Shannon]

Mark Shannon <mark at hotpy.org> added the comment:

What's happening is that the cycle GC calls type_clear to clear the type, but the method-cache is not invalidated.
I have added a call to PyType_Modified in type_clear (as well as type_set_name and type_set_qualname, which also modify the type).

Patch is attached.

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Added file: http://bugs.python.org/file23964/patch

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