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MDEV-6483 - Deadlock around rw_lock_debug_mutex on PPC64 This problem affects only debug builds on PPC64. There are at least two race conditions around rw_lock_debug_mutex_enter and rw_lock_debug_mutex_exit: - rw_lock_debug_waiters was loaded/stored without setting appropriate locks/memory barriers. - there is a gap between calls to os_event_reset() and os_event_wait() and in such case we're supposed to pass return value of the former to the latter. Fixed by replacing self-cooked spinlocks with system mutexes. These days system mutexes offer much better performance. OTOH performance is not that critical for debug builds. |
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