HypothesisWorks/hypothesis#3585 is reproducible on Python 3.10.10 but not 3.10.9, and so we suspect that #100922 may have introduced a (rare?) deadlock while fixing the data race in #100892.

The downstream bug report on Hypothesis includes a reliable (but not minimal reproducer) on OSX - though it's unclear whether this might be an artifact of different patch versions of CPython on the various machines which have checked so far.

Linked PRs

• GH-102126: fix deadlock at shutdown when clearing thread states #102222
• [3.11] GH-102126: fix deadlock at shutdown when clearing thread state… #102234
• [3.10] GH-102126: fix deadlock at shutdown when clearing thread state… #102235
• [3.9] GH-102126: fix deadlock at shutdown when clearing thread states (GH-102222) #102236