Comment 12 for bug 1638350

All searches are inconclusive, no sign of errors in the logs, no process eating all the CPU. The only thing off seems to be in /var/log/messages in overcloud controller. This error is continuously repeated.

Nov 8 17:07:05 localhost Keepalived_vrrp[19924]: bogus VRRP packet received on br-ex !!!
Nov 8 17:07:05 localhost Keepalived_vrrp[19924]: VRRP_Instance(51) Dropping received VRRP packet...
Nov 8 17:07:05 localhost Keepalived_vrrp[19924]: ip address associated with VRID not present in received packet : 192.0.2.6
Nov 8 17:07:05 localhost Keepalived_vrrp[19924]: one or more VIP associated with VRID mismatch actual MASTER advert
Nov 8 17:07:05 localhost Keepalived_vrrp[19924]: bogus VRRP packet received on br-ex !!!
Nov 8 17:07:05 localhost Keepalived_vrrp[19924]: VRRP_Instance(52) Dropping received VRRP packet...

No progress other that this, and it seems it doesn't happen often, so it's hard to reproduce.