diff --git a/[refs] b/[refs]
index 3aa9892e9d12..55e60769bdbb 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: b335b0034e252e79ec2e9c6697f5d663c4627bec
+refs/heads/master: 7951f3cefbd711f4429a0cd014aa83a844c399a0
diff --git a/trunk/fs/btrfs/ctree.c b/trunk/fs/btrfs/ctree.c
index 35443cc4b9a9..6674692f7023 100644
--- a/trunk/fs/btrfs/ctree.c
+++ b/trunk/fs/btrfs/ctree.c
@@ -917,9 +917,9 @@ static noinline int balance_level(struct btrfs_trans_handle *trans,
 
 		/* promote the child to a root */
 		child = read_node_slot(root, mid, 0);
+		BUG_ON(!child);
 		btrfs_tree_lock(child);
 		btrfs_set_lock_blocking(child);
-		BUG_ON(!child);
 		ret = btrfs_cow_block(trans, root, child, mid, 0, &child, 0);
 		BUG_ON(ret);