--- zzzz-none-000/linux-4.4.60/net/bridge/br_stp_if.c	2017-04-08 07:53:53.000000000 +0000
+++ dragonfly-4020-701/linux-4.4.60/net/bridge/br_stp_if.c	2018-11-08 13:36:17.000000000 +0000
@@ -166,6 +166,7 @@
 		br_debug(br, "using kernel STP\n");
 
 		/* To start timers on any ports left in blocking */
+		mod_timer(&br->hello_timer, jiffies + br->hello_time);
 		br_port_state_selection(br);
 	}