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nascheme
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Add _PyRecursiveMutex_at_fork_reinit() helper function.
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Reset the warnings lock in the child after fork, before clearing other threads’ states. This prevents deadlocks when their finalizers issue warnings and the lock was held by a thread that no longer exists. Record ownership before fork so the child can preserve the lock’s recursion depth and update its owner ID if the forking thread held it. Adds regression tests for child-cleanup warnings and recursive ownership across fork.
The PR was developed with assistance from GPT 6.1 Sol.
os.fork()child can hang insidePyOS_AfterFork_Child()on the warnings lock (3.14 regression) #158973