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* Use patched parking_lot_core with fork-safe HASHTABLE reset parking_lot_core's global HASHTABLE retains stale ThreadData after fork(), causing segfaults when contended locks enter park(). Use the patched version from youknowone/parking_lot (rustpython branch) which registers a pthread_atfork handler to reset the hash table. Unskip test_asyncio TestFork. Add Manager+fork integration test. * Unskip fork-related flaky tests after parking_lot fix With parking_lot_core's HASHTABLE now properly reset via pthread_atfork, fork-related segfaults and connection errors in multiprocessing tests should be resolved. Remove skip/expectedFailure markers from: - test_concurrent_futures/test_wait.py (6 tests) - test_concurrent_futures/test_process_pool.py (1 test) - test_multiprocessing_fork/test_manager.py (all WithManagerTest*) - test_multiprocessing_fork/test_misc.py (5 tests) - test_multiprocessing_fork/test_threads.py (2 tests) - _test_multiprocessing.py (2 shared_memory tests) Keep test_repr_rlock skipped (flaky thread start latency, not fork-related).