Fix parking lot hash table after fork#6963
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Fix parking lot hash table after fork#6963youknowone wants to merge 1 commit intoRustPython:mainfrom
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This was referenced Feb 2, 2026
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parking_lot_core maintains a global hash table (HASHTABLE) mapping lock addresses to queues of parked threads. Each bucket holds a linked list of ThreadData pointers.
fork() copies all memory but only one thread survives in the child. The hash table still references ThreadData of the dead threads, WordLocks held by them will never be released, and queue pointers become stale. When the child later hits a contended lock, park() follows these stale pointers and segfaults.
parking_lot_core currently has no such handling for child process
Issue reported to parking_lot Amanieu/parking_lot#515