--- linux-1/fs/ext4/namei.c	2016-09-27 02:16:31.020890438 +0800
+++ linux-2/fs/ext4/namei.c	2016-09-27 02:17:14.246620470 +0800
@@ -1874,6 +1874,7 @@ out_frames:
 	 */
 	ext4_mark_inode_dirty(handle, dir);
 	dx_release(frames);
+	brelse(bh);
 	return retval;
 }