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/session/sessions_collection_rs.cpp:78: MISSING_LOCK 141941 Accessing "this->_targeter" without holding lock "mongo::SessionsCollectionRS._mutex". Elsewhere, "mongo::SessionsCollectionRS._targeter" is written to with "SessionsCollectionRS._mutex" held 1 out of 1 times.