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/modules/enterprise/src/fcbis/file_copy_based_initial_syncer.cpp:924: MISSING_LOCK 155300 Accessing "this->_syncingFilesState.lastAppliedOpTimeOnSyncSrc" without holding lock "mongo::repl::FileCopyBasedInitialSyncer._mutex". Elsewhere, "mongo::repl::FileCopyBasedInitialSyncer::SyncingFilesState.lastAppliedOpTimeOnSyncSrc" is written to with "FileCopyBasedInitialSyncer._mutex" held 1 out of 1 times (1 of these accesses strongly imply that it is necessary).