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/db/keys_collection_manager.cpp:383: MISSING_LOCK 150041 Accessing "this->_backgroundThread" without holding lock "mongo::KeysCollectionManager::PeriodicRunner._mutex". Elsewhere, "mongo::KeysCollectionManager::PeriodicRunner._backgroundThread" is written to with "PeriodicRunner._mutex" held 1 out of 1 times.