Mark Shannon <m...@hotpy.org> added the comment:

# This needs to be C code for this to fail, I'm writing it in Python for 
clarity and brevity

class D:
    def __get__(self, instance, owner):
       del C.d
       # There are now no strong references to self
       self.whatever # Access to freed memory

# This can be Python

class C:
    d = D()

C.d

----------
nosy: +Mark.Shannon

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue46561>
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