[issue35983] tp_dealloc trashcan shouldn't be called for subclasses

[Serhiy Storchaka]

Serhiy Storchaka <storchaka+cpython at gmail.com> added the comment:

Disabling the trashcan mechanism returns the problem for solving which the trashcan mechanism was introduced.

>>> from _testcapi import MyList
>>> L = None
>>> for i in range(1000000):
...     L = MyList((L,))
... 
>>> del L
Segmentation fault (core dumped)

I think we need better way to resolve this issue.

For example, setting the object type to the parent type should solve this issue.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue35983>
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