==== //depot/user/bms/netdev/sys/net/if.c#10 - /home/bms/p4/netdev/sys/net/if.c ====
--- /tmp/tmp.1084.0	Mon Mar 26 17:18:47 2007
+++ /home/bms/p4/netdev/sys/net/if.c	Mon Mar 26 17:18:33 2007
@@ -2513,19 +2513,19 @@
 	 * If the ifnet is detaching, null out references to ifnet,
 	 * so that upper protocol layers will notice, and not attempt
 	 * to obtain locks for an ifnet which no longer exists.
-	 * It is OK to call rt_newmaddrmsg() with a NULL ifp.
+	 * XXX: rt_newaddrmsg() needs to be called before the ifnet instance
+	 * is detached from the system interface list.
 	 */
 	if (detaching) {
 #ifdef DIAGNOSTIC
 		printf("%s: detaching ifnet instance %p\n", __func__, ifp);
 #endif
+		rt_newmaddrmsg(RTM_DELMADDR, ifma);
 		ifma->ifma_ifp = NULL;
 	}
 
 	if (--ifma->ifma_refcount > 0)
 		return 0;
-
-	rt_newmaddrmsg(RTM_DELMADDR, ifma);
 
 	/*
 	 * If this ifma is a network-layer ifma, a link-layer ifma may