--- b/sys/net/if.c	
+++ b/sys/net/if.c	
@@ -1187,7 +1187,6 @@ if_detach_internal(struct ifnet *ifp, int vmove, struct if_clone **ifcp)
 		 */
 		free(ifp->if_hw_addr, M_IFADDR);
 		ifp->if_hw_addr = NULL;
-		ifp->if_addr = NULL;
 
 		/* We can now free link ifaddr. */
 		IF_ADDR_WLOCK(ifp);
--- b/sys/net/rtsock.c	
+++ b/sys/net/rtsock.c	
@@ -1566,7 +1566,7 @@ sysctl_dumpentry(struct radix_node *rn, void *vw)
 	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_UP)) {
 		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 @@ sysctl_rtsock(SYSCTL_HANDLER_ARGS)
 		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);
+				NET_EPOCH_ENTER();
+				error = rnh->rnh_walktree(&rnh->head,
 				    sysctl_dumpentry, &w);
+				NET_EPOCH_EXIT();
 				RIB_RUNLOCK(rnh);
 			} else if (af != 0)
 				error = EAFNOSUPPORT;