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805288929f
access to clear the entry in each thread's tsd array for the key being deleted was not synchronized with __pthread_tsd_run_dtors. I probably made this mistake from a mistaken belief that the thread list lock was held during the latter, which of course is not possible since it executes application code in a still-live-thread context. while we're at it, expand the interval during which signals are blocked to cover taking the write lock on key_lock, so that a signal at an inopportune time doesn't block forward progress of readers.