You have been subscribed to a public bug by Eric Desrochers (slashd):

During upgrades on 2018-01-02, corosync and it's libs were upgraded:

(from a trusty/mitaka cloud)

Upgrade: libcmap4:amd64 (2.3.3-1ubuntu3, 2.3.3-1ubuntu4), corosync:amd64
(2.3.3-1ubuntu3, 2.3.3-1ubuntu4), libcfg6:amd64 (2.3.3-1ubuntu3,
2.3.3-1ubuntu4), libcpg4:amd64 (2.3.3-1ubuntu3, 2.3.3-1ubuntu4),
libquorum5:amd64 (2.3.3-1ubuntu3, 2.3.3-1ubuntu4), libcorosync-
common4:amd64 (2.3.3-1ubuntu3, 2.3.3-1ubuntu4), libsam4:amd64
(2.3.3-1ubuntu3, 2.3.3-1ubuntu4), libvotequorum6:amd64 (2.3.3-1ubuntu3,
2.3.3-1ubuntu4), libtotem-pg5:amd64 (2.3.3-1ubuntu3, 2.3.3-1ubuntu4)

During this process, it appears that pacemaker service is restarted and
it errors:

syslog:Jan  2 16:09:33 juju-machine-0-lxc-4 pacemakerd[1994]:   notice: 
crm_update_peer_state: pcmk_quorum_notification: Node 
juju-machine-1-lxc-3[1001] - state is now lost (was member)
syslog:Jan  2 16:09:34 juju-machine-0-lxc-4 pacemakerd[1994]:   notice: 
crm_update_peer_state: pcmk_quorum_notification: Node 
juju-machine-1-lxc-3[1001] - state is now member (was lost)
syslog:Jan  2 16:14:32 juju-machine-0-lxc-4 pacemakerd[1994]:    error: 
cfg_connection_destroy: Connection destroyed
syslog:Jan  2 16:14:32 juju-machine-0-lxc-4 pacemakerd[1994]:   notice: 
pcmk_shutdown_worker: Shuting down Pacemaker
syslog:Jan  2 16:14:32 juju-machine-0-lxc-4 pacemakerd[1994]:   notice: 
stop_child: Stopping crmd: Sent -15 to process 2050
syslog:Jan  2 16:14:32 juju-machine-0-lxc-4 pacemakerd[1994]:    error: 
pcmk_cpg_dispatch: Connection to the CPG API failed: Library error (2)
syslog:Jan  2 16:14:32 juju-machine-0-lxc-4 pacemakerd[1994]:    error: 
mcp_cpg_destroy: Connection destroyed


Also affected xenial/ocata

** Affects: charm-hacluster
     Importance: Undecided
         Status: Invalid

** Affects: corosync (Ubuntu)
     Importance: Medium
     Assignee: Eric Desrochers (slashd)
         Status: In Progress

** Affects: corosync (Ubuntu Trusty)
     Importance: Medium
     Assignee: Victor Tapia (vtapia)
         Status: New

** Affects: corosync (Ubuntu Xenial)
     Importance: Medium
     Assignee: Eric Desrochers (slashd)
         Status: New

** Affects: corosync (Ubuntu Zesty)
     Importance: Medium
     Assignee: Eric Desrochers (slashd)
         Status: New

** Affects: corosync (Ubuntu Artful)
     Importance: Medium
     Assignee: Eric Desrochers (slashd)
         Status: New

** Affects: corosync (Ubuntu Bionic)
     Importance: Medium
     Assignee: Eric Desrochers (slashd)
         Status: In Progress


** Tags: canonical-bootstack regression-update sts
-- 
corosync upgrade on 2018-01-02 caused pacemaker to fail
https://bugs.launchpad.net/bugs/1740892
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