diff --git a/net/core/neighbour.c b/net/core/neighbour.c
index 4128fc76ac3a2906bc586c1f5b05ae670cdca686..766caa0dd9305be10468da8af20f72acb1f6922f 100644
--- a/net/core/neighbour.c
+++ b/net/core/neighbour.c
@@ -732,6 +732,7 @@ static inline void neigh_add_timer(struct neighbour *n, unsigned long when)
 	if (unlikely(mod_timer(&n->timer, when))) {
 		printk("NEIGH: BUG, double timer add, state is %x\n",
 		       n->nud_state);
+		dump_stack();
 	}
 }