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
/data/mci/4fce031de9267fb3c47945a835ecc176/bazel_cache/e4de32cbb3cd53654b52f9247a499e3e/execroot/_main/src/mongo/db/s/migration_destination_manager.cpp:1377: MISSING_LOCK 145693 Accessing "this->_toShard" without holding lock "mongo::MigrationDestinationManager._mutex". Elsewhere, "mongo::MigrationDestinationManager._toShard" is written to with "MigrationDestinationManager._mutex" held 1 out of 1 times.