Index: linux-stage/fs/ext4/mballoc.c
===================================================================
--- linux-stage.orig/fs/ext4/mballoc.c
+++ linux-stage/fs/ext4/mballoc.c
@@ -3781,7 +3781,8 @@ ext4_mb_release_inode_pa(struct ext4_bud
 		 * from the bitmap and continue.
 		 */
 	}
-	BUG_ON(pa->pa_free != free);
+	/* do not verify if the file system is being umounted */
+	BUG_ON(atomic_read(&sb->s_active) > 0 && pa->pa_free != free);
 	atomic_add(free, &sbi->s_mb_discarded);
 
 	return err;