gh-118332: Fix deadlock involving stop the world #118412
Merged
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Avoid detaching thread state when stopping the world. When re-attaching the thread state, the thread would attempt to resume the top-most critical section, which might now be held by a thread paused for our stop-the-world request, leading to deadlock.
test_multiprocessing_pool_circular_import
in free-threaded build #118332