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Problem: MYSQL_BIN_LOG::reset_logs acquires mutexes in wrong order. The correct order is first LOCK_thread_count and then LOCK_log. This function does it the other way around. This leads to deadlock when run in parallel with a thread that takes the two locks in correct order. For example, a thread that disconnects will take the locks in the correct order. Fix: change order of the locks in MYSQL_BIN_LOG::reset_logs: first LOCK_thread_count and then LOCK_log.