> Command make hangs on test_weakref 

You don't provide enough information to investigate. You should re-run tests in verbose mode and use --timeout=60 to get a traceback where the test hangs.

Since Python 3.6, the test suite (in general) got tons of fixes to make tests more reliable, and so it sounds likely that your issue has been fixed in the meanwhile.

https://bugs.python.org/issue29796 was specific to Python 2.7 which sounds time.sleep() argument towards zero. In Python 3.6, the argument is rounded away from zero.

I close the issue. Reopen the issue if you can still reproduce it on Python 3.10.