.

wcfs/wcfs.go

@@ -756,7 +756,9 @@ retry:
 		head.pauseOSCacheUpload = true
 		head.continueOSCacheUpload = continueOSCacheUpload
 
-		if head.inflightOSCacheUploads != 0 {
+		// NOTE need atomic load, since inflightOSCacheUploads
+		// decrement is done not under zheadMu.
+		if atomic.LoadInt32(&head.inflightOSCacheUploads) != 0 {
 			head.zheadMu.Unlock()
 			continue retry
 		}