Index: head/sys/net/if.c
===================================================================
--- head/sys/net/if.c
+++ head/sys/net/if.c
@@ -821,8 +821,7 @@
 	 * Since dp->dom_ifattach calls malloc() with M_WAITOK, we
 	 * cannot lock ifp->if_afdata initialization, entirely.
 	 */
-	if (IF_AFDATA_TRYLOCK(ifp) == 0)
-		return;
+	IF_AFDATA_LOCK(ifp);
 	if (ifp->if_afdata_initialized >= domain_init_status) {
 		IF_AFDATA_UNLOCK(ifp);
 		log(LOG_WARNING, "%s called more than once on %s\n",