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/baton.cpp:96: MISSING_LOCK 148847 Accessing "this->_isDead" without holding lock "mongo::<unnamed>::SubBaton._mutex". Elsewhere, "mongo::<unnamed>::SubBaton._isDead" is written to with "SubBaton._mutex" held 1 out of 1 times (1 of these accesses strongly imply that it is necessary).