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

[Chris Jerdonek]

Change by Chris Jerdonek <chris.jerdonek at gmail.com>:


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stage: patch review -> needs patch
versions: +Python 3.7, Python 3.8

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