Data race condition

The value of the shared data will be determined by the interleaving of thread execution. Thread shared data is accessed without holding an appropriate lock, possibly causing a race condition
/src/mongo/util/background.cpp:337: MISSING_LOCK 175075 Accessing "this->_tasks" without holding lock "mongo::<unnamed>::PeriodicTaskRunner._mutex". Elsewhere, "mongo::<unnamed>::PeriodicTaskRunner._tasks" is written to with "PeriodicTaskRunner._mutex" held 1 out of 1 times.