multiple dh-ctlplane dhclient processes and undercloud drops off network

[Robert Collins]

Second time this has happened -
 uptime
 01:34:27 up 5 days, 2:34, 2 users, load average: 0.32, 0.50, 0.55
(haven't rebooted since the last occurrence, think its ~24 hours?)

ps fax | grep dhclient:
 4895 ? Ss 0:00 dhclient -1 -v -pf /run/dhclient.br-ctlplane.pid -lf
/var/lib/dhcp/dhclient.br-ctlplane.leases br-ctlplane
10507 tty1 S+ 0:00 \_ grep --color=auto dhcp
22169 ? Ss 0:00 dhclient -1 -v -pf /run/dhclient.br-ctlplane.pid -lf
/var/lib/dhcp/dhclient.br-ctlplane.leases br-ctlplane
23734 ? Ss 0:00 dhclient -1 -v -pf /run/dhclient.br-ctlplane.pid -lf
/var/lib/dhcp/dhclient.br-ctlplane.leases br-ctlplane
23106 ? Ss 0:00 dhclient -1 -v -pf /run/dhclient.br-ctlplane.pid -lf
/var/lib/dhcp/dhclient.br-ctlplane.leases br-ctlplane
23273 ? Ss 0:00 dhclient -1 -v -pf /run/dhclient.br-ctlplane.pid -lf
/var/lib/dhcp/dhclient.br-ctlplane.leases br-ctlplane

cat /run/dhclient.br-ctlplane.pid
23273

Once this happens, we have to get networking back by rebooting or ifdown+ifup - os-collect-config will fail as it can't reach the metadata services.

So I do that, killing all the dhclients in the middle, and then run os-collect-config --force --one to get the route back, and after that:

18642 ? Ss 0:00 dhclient -1 -v -pf /run/dhclient.br-ctlplane.pid -lf
/var/lib/dhcp/dhclient.br-ctlplane.leases br-ctlplane
18808 ? Ss 0:00 dhclient -1 -v -pf /run/dhclient.br-ctlplane.pid -lf
/var/lib/dhcp/dhclient.br-ctlplane.leases br-ctlplane

I'm fairly sure its an ensure-bridge issue, but I'm not sure if its an issue in the current code or my patchset only.

[Launchpad Janitor (janitor)]

[Expired for tripleo because there has been no activity for 60 days.]