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/s/balancer/auto_merger_policy.cpp:66: MISSING_LOCK 168888 Accessing "this->_enabled" without holding lock "mongo::AutoMergerPolicy._mutex". Elsewhere, "mongo::AutoMergerPolicy._enabled" is written to with "AutoMergerPolicy._mutex" held 2 out of 2 times (1 of these accesses strongly imply that it is necessary).