diff --git a/[refs] b/[refs]
index 967ed88e1f8d..71c2ae17b962 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: fe15d706cfc1cb321dbe2329b04b5ca185edff60
+refs/heads/master: 0bb7b59d6e2b8440cd7097097dd4bbfc4d76ed07
diff --git a/trunk/kernel/rcutree.c b/trunk/kernel/rcutree.c
index 3cf713a724c1..570f7530f4b3 100644
--- a/trunk/kernel/rcutree.c
+++ b/trunk/kernel/rcutree.c
@@ -1707,6 +1707,7 @@ __call_rcu(struct rcu_head *head, void (*func)(struct rcu_head *rcu),
 	unsigned long flags;
 	struct rcu_data *rdp;
 
+	WARN_ON_ONCE((unsigned long)head & 0x3); /* Misaligned rcu_head! */
 	debug_rcu_head_queue(head);
 	head->func = func;
 	head->next = NULL;