tongxiaoge added the comment:
I previously suspected the patch d0d83a9
(https://github.com/python/cpython/commit/d0d83a94314402366e04e7ea2638f809510eb830)
fixed this problem, so I upgraded python3 to 3.10.2, but the problem still
occurred.
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New submission from tongxiaoge :
This problem is probabilistic. I run Python3 all test cases on OBS. In recent
months, there have been about three times that the test cases hang on
probabilistically. The current version with problems is 3.10.2, this problem
has also appeared in 3.10.0 and 3.9
