Gregory P. Smith <g...@krypto.org> added the comment:

This is a stack overflow in Objects/abstract.c because we infinitely recurse 
within abstract_issubclass().

We should probably do some validity checking on the bases tuple that 
abstract_get_bases returns (ideally within abstract_get_bases?).  The tuple 
must contain types.

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nosy: +gregory.p.smith

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue30570>
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