Pablo Galindo Salgado <pablog...@gmail.com> added the comment:

For the weakref to be handled correctly the ctypedescr needs to be identified 
correctly as part of the isolated cycle. If is not in the isolated cycle 
something may be missing tp_traverse or the GC flags. 

Can you check if the ctypedescr is part of GC.objects()?

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue38006>
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