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5d349ea857
new_session() was popping the old cached session, releasing the lock, calling get_or_create, then re-acquiring the lock to insert. A concurrent caller could observe the empty-cache window and race-create its own session, producing two divergent session objects for the same key. _cache_lock is an RLock, so nested reacquisition inside get_or_create is safe. Hold it across the whole pop/create/insert sequence. Follow-up to #13510 (@hekaru-agent).