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[Eric Desrochers <eric.desrochers@xxxxxxxxxxxxx>]

Was able to build fine using (optional)

--------------------
Standard symbol tags

optional

A symbol marked as optional can disappear from the library at any time
and that will never cause dpkg-gensymbols to fail. However, disappeared
optional symbols will continuously appear as  MISSING  in the diff in
each new package revision.  This behaviour serves as a reminder for the
maintainer that such a symbol needs to be removed from the symbol file
or readded to the library. When the optional symbol, which was
previously declared as MISSING, suddenly reappears in the next revision,
it will be upgraded back to the  “existing” status with its minimum
version unchanged.

This tag is useful for symbols which are private where their disappearance do not cause ABI breakage. For example, most of C++ template instantiations fall into this category. Like any
other tag, this one may also have an arbitrary value: it could be used to indicate why the symbol is considered optional.
--------------------

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https://bugs.launchpad.net/bugs/1740892

Title:
  corosync upgrade on 2018-01-02 caused pacemaker to fail

Status in OpenStack hacluster charm:
  Invalid
Status in corosync package in Ubuntu:
  Fix Released
Status in pacemaker package in Ubuntu:
  Fix Released
Status in corosync source package in Trusty:
  Won't Fix
Status in pacemaker source package in Trusty:
  Won't Fix
Status in corosync source package in Xenial:
  In Progress
Status in pacemaker source package in Xenial:
  In Progress
Status in corosync source package in Artful:
  In Progress
Status in pacemaker source package in Artful:
  In Progress
Status in corosync source package in Bionic:
  Fix Released
Status in corosync package in Debian:
  New

Bug description:
  [Impact]

  When corosync and pacemaker are both installed, a corosync upgrade
  caused pacemaker to fail. pacemaker will need to be restarted manually
  to work again, it won't recover by itself.

  [Test Case]

  1) Have corosync (< 2.3.5-3ubuntu2) and pacemaker (< 1.1.14-2ubuntu1.3) installed
  2) Make sure corosync & pacemaker are running via systemctl status cmd.
  3) Upgrade corosync
  4) Look corosync and pacemaker via systemctl status cmd again.

  You will notice pacemaker is dead (inactive) and doesn't recover,
  unless a systemctl start pacemaker is done manually.

  [Regression Potential]

  Regression potential is low, it doesn't change corosync/pacemaker core
  functionality. This patch make sure thing goes smoother at the
  packaging level during a corosync upgrade where pacemaker is
  installed/involved.

  This can also be useful in particular in situation where the system
  has "unattended-upgrades" enable (software upgrades without
  supervision), and no sysadmin available to start pacemaker manually
  because this isn't a schedule maintenance.

  [Other Info]

  XENIAL Merge-proposal:
  https://code.launchpad.net/~nacc/ubuntu/+source/corosync/+git/corosync/+merge/336338
  https://code.launchpad.net/~nacc/ubuntu/+source/pacemaker/+git/pacemaker/+merge/336339

  [Original Description]

  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

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