1 files changed, 2 insertions, 0 deletions
diff --git a/src/mongo/db/concurrency/lock_manager.cpp b/src/mongo/db/concurrency/lock_manager.cpp
index f90141e79be..8ae7919012e 100644
--- a/src/mongo/db/concurrency/lock_manager.cpp
+++ b/src/mongo/db/concurrency/lock_manager.cpp
@@ -592,7 +592,9 @@ bool LockManager::unlock(LockRequest* request) {
         lock->decGrantedModeCount(request->mode);
 
         if (request->compatibleFirst) {
+            invariant(lock->compatibleFirstCount > 0);
             lock->compatibleFirstCount--;
+            invariant(lock->compatibleFirstCount == 0 || !lock->grantedList.empty());
         }
 
         _onLockModeChanged(lock, lock->grantedCounts[request->mode] == 0);