Index: sys/net/if.c
===================================================================
--- sys/net/if.c
+++ sys/net/if.c
@@ -1068,6 +1068,8 @@
 	CK_STAILQ_FOREACH(iter, &V_ifnet, if_link)
 		if (iter == ifp) {
 			CK_STAILQ_REMOVE(&V_ifnet, ifp, ifnet, if_link);
+			if (!vmove)
+				ifp->if_flags |= IFF_DYING;
 			found = 1;
 			break;
 		}
Index: sys/net/rtsock.c
===================================================================
--- sys/net/rtsock.c
+++ sys/net/rtsock.c
@@ -1566,7 +1566,7 @@
 	info.rti_info[RTAX_NETMASK] = rtsock_fix_netmask(rt_key(rt),
 	    rt_mask(rt), &ss);
 	info.rti_info[RTAX_GENMASK] = 0;
-	if (rt->rt_ifp) {
+	if (rt->rt_ifp && !(rt->rt_ifp->if_flags & IFF_DYING)) {
 		info.rti_info[RTAX_IFP] = rt->rt_ifp->if_addr->ifa_addr;
 		info.rti_info[RTAX_IFA] = rt->rt_ifa->ifa_addr;
 		if (rt->rt_ifp->if_flags & IFF_POINTOPOINT)
@@ -1921,9 +1921,11 @@
 		for (error = 0; error == 0 && i <= lim; i++) {
 			rnh = rt_tables_get_rnh(fib, i);
 			if (rnh != NULL) {
-				RIB_RLOCK(rnh); 
-			    	error = rnh->rnh_walktree(&rnh->head,
+				RIB_RLOCK(rnh);
+				IFNET_RLOCK_NOSLEEP();
+				error = rnh->rnh_walktree(&rnh->head,
 				    sysctl_dumpentry, &w);
+				IFNET_RLOCK_NOSLEEP();
 				RIB_RUNLOCK(rnh);
 			} else if (af != 0)
 				error = EAFNOSUPPORT;