--- x/fs/kernfs/file.c
+++ y/fs/kernfs/file.c
@@ -775,9 +775,11 @@ static int kernfs_fop_release(struct ino
 	if (kn->flags & KERNFS_HAS_RELEASE) {
 		struct mutex *mutex;
 
+		mutex_lock(&of->mutex);
 		mutex = kernfs_open_file_mutex_lock(kn);
 		kernfs_release_file(kn, of);
 		mutex_unlock(mutex);
+		mutex_unlock(&of->mutex);
 	}
 
 	kernfs_unlink_open_file(kn, of, false);