[issue3100] weakref subclass segfault

[Adam Olsen]

Adam Olsen <rhamph at gmail.com> added the comment:

Specific enough yet?  Seems the WeakValueDictionary and the module
clearing aren't necessary.

A subclass of weakref is created.  The target of this weakref is added
as an attribute of the weakref.  So long as a callback is present there
will be a crash on shutdown.  However, if the callback prints the
attribute, you get a crash right then.  The weakref claims to be dead,
which shouldn't be possible when the weakref's attributes have a strong
reference to the target.

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title: segfault with WeakValueDictionary and module clearing -> weakref subclass segfault
Added file: http://bugs.python.org/file10613/weakref_subclass_cycle.py

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