[issue16602] weakref can return an object with 0 refcount

[Roundup Robot]

Roundup Robot added the comment:

New changeset 7e771f0363e2 by Antoine Pitrou in branch '2.7':
Issue #16602: When a weakref's target was part of a long deallocation chain, the object could remain reachable through its weakref even though its refcount had dropped to zero.
http://hg.python.org/cpython/rev/7e771f0363e2

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue16602>
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