[issue16392] frozen importlib crashes on circular imports in ext modules

[Brett Cannon]

Brett Cannon added the comment:

I don't mean for this to sound rude, but this seems like a Cython issue and not one for the stdlib. Can you reproduce the problem without using Cython? The new per-module locking mechanism Antoine prevents this from being a problem normally, so it makes me think Cython is at fault here.

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nosy: +brett.cannon, pitrou

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<http://bugs.python.org/issue16392>
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