zonedb-reload: when recreating zone, replan also refresh...

...as it might be planned by incomming NOTIFY during zonedb-reload
and in this case its not in timers

src/knot/events/replan.c

@@ -56,6 +56,7 @@ static void replan_from_zone(zone_t *zone, zone_t *old_zone)
 	replan_ddns(zone, old_zone);
 
 	const zone_event_type_t types[] = {
+		ZONE_EVENT_REFRESH,
 		ZONE_EVENT_FLUSH,
 		ZONE_EVENT_BACKUP,
 		ZONE_EVENT_NOTIFY,

tests-extra/tests/zone/reload_notify/test.py

@@ -0,0 +1,40 @@
+#!/usr/bin/env python3
+
+'''Test race conditions about incomming NOTIFY during zonedb-reload'''
+
+from dnstest.test import Test
+from dnstest.utils import *
+
+import random
+import threading
+
+t = Test()
+
+master = t.server("knot")
+slave = t.server("knot")
+zones = t.zone_rnd(60, dnssec=False, records=10)
+t.link(zones, master, slave, ixfr=True)
+
+t.start()
+
+serials = slave.zones_wait(zones)
+
+def send_reload(server):
+    server.ctl("reload")
+
+def send_update(up):
+    up.send()
+
+for z in zones:
+    up = master.update(z)
+    up.add("dojdojwodijowjeojdwe", 3600, "A", "1.2.3.4")
+
+    threading.Thread(target=send_update, args=[up]).start()
+
+t.sleep(random.choice([0.1, 0.2, 0.5, 1, 2, 4]))
+
+slave.reload()
+
+slave.zones_wait(zones, serials)
+
+t.end()