I have a system with two routers acting as an HA Pair using VRRP.
I upgraded R2 from 1.1.8 to 1.2.0-rolling+201810190743 and it came up fine.
After upgrading R1 from 1.1.8 to 1.2.0-rolling+201810190743, the ospfd process appears to crash after the neighbor relationship gets deleted:
Oct 19 18:01:54 VYOS-R2 ospfd: AdjChg: Nbr 172.16.1.7 on eth3.1045:172.16.4.118: Full -> Deleted (InactivityTimer) Oct 19 18:01:54 VYOS-R2 ospfd: nsm_change_state:(172.16.1.7, Full -> Deleted): scheduling new router-LSA origination Oct 19 18:01:54 VYOS-R2 ospfd: Assertion `node' failed in file ospfd/ospf_packet.c, line 666, function ospf_write Oct 19 18:01:54 VYOS-R2 zebra: [EC 4043309116] Client 'ospf' encountered an error and is shutting down. Oct 19 18:01:54 VYOS-R2 zebra: client 41 disconnected. 39 ospf routes removed from the rib
I can privately share copies of the configuration on both routers if needed.
The same behavior seems to be present in 1.2.0-rc1 up to the current rolling release.