Thread deadlock

Two threads will be stuck waiting forever if each holds a lock the other needs to acquire. Threads may try to acquire two locks in different orders, potentially causing deadlock
/src/mongo/util/alarm.cpp:89: ORDER_REVERSAL 149043 Calling "unique_lock" acquires lock "mongo::AlarmSchedulerPrecise._mutex". [Note: The source code implementation of the function has been overridden by a builtin model.]