Index: sys/netgraph/ng_l2tp.c
===================================================================
--- sys/netgraph/ng_l2tp.c
+++ sys/netgraph/ng_l2tp.c
@@ -1453,15 +1453,15 @@
 	struct mbuf *m;
 	u_int delay;
 
+	/* Sanity check */
+	L2TP_SEQ_CHECK(seq);
+
+	mtx_lock(&seq->mtx);
 	/* Make sure callout is still active before doing anything */
 	if (callout_pending(&seq->rack_timer) ||
 	    (!callout_active(&seq->rack_timer)))
 		return;
 
-	/* Sanity check */
-	L2TP_SEQ_CHECK(seq);
-
-	mtx_lock(&seq->mtx);
 	priv->stats.xmitRetransmits++;
 
 	/* Have we reached the retransmit limit? If so, notify owner. */