diff --git a/kernel/rcutree.c b/kernel/rcutree.c
index 3cf713a724c150557473b297d390bdaab7211d77..570f7530f4b3d015d28cf3a97cebeb4fc1cfa1d6 100644
--- a/kernel/rcutree.c
+++ b/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;