[issue40696] exception chain cycles cause hangs (was "Exception handling with "await" can hang in Python3.9.0b1")

[Dennis Sweeney]

Dennis Sweeney <sweeney.dennis650 at gmail.com> added the comment:

I believe PR 20539 solves the more general problem (using Floyd's Tortoise and Hare Algorithm), and I would appreciate review / some more ideas for test cases.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue40696>
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