Index: sys/net/if.c
===================================================================
--- sys/net/if.c
+++ sys/net/if.c
@@ -1582,15 +1582,17 @@
 			CK_STAILQ_REMOVE(&V_ifg_head, ifgl->ifgl_group, ifg_group, ifg_next);
 			ifglfree = 1;
 		}
-
 		IFNET_WUNLOCK();
+
 		epoch_wait_preempt(net_epoch_preempt);
-		free(ifgm, M_TEMP);
 		if (ifglfree) {
 			EVENTHANDLER_INVOKE(group_detach_event,
 								ifgl->ifgl_group);
 			free(ifgl->ifgl_group, M_TEMP);
 		}
+		free(ifgm, M_TEMP);
+		free(ifgl, M_TEMP);
+
 		EVENTHANDLER_INVOKE(group_change_event, groupname);
 
 		IFNET_WLOCK();