Misc/NEWS.d/next/Core and Builtins/2023-01-06-09-22-21.gh-issue-91351.iq2vZ_.rst


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Fix a case where re-entrant imports could corrupt the import deadlock
detection code and cause a :exc:`KeyError` to be raised out of
:mod:`importlib/_bootstrap`.  In addition to the straightforward cases, this
could also happen when garbage collection leads to a warning being emitted --
as happens when it collects an open socket or file)