FTR, my reported bug was triggered by the environment variable DRBD_DONT_WARN_ON_VERSION_MISMATCH, which was set on my systems.
To work around this bug: unset DRBD_DONT_WARN_ON_VERSION_MISMATCH restart pacemaker (do this before installing drbd8-utils 8.4.3-0ubuntu0.12.04.x)
See also: https://bugs.launchpad.net/ubuntu/+source/drbd8/+bug/1314598
FTR, my reported bug was triggered by the environment variable DRBD_DONT_ WARN_ON_ VERSION_ MISMATCH, which was set on my systems.
To work around this bug: WARN_ON_ VERSION_ MISMATCH 12.04.x)
unset DRBD_DONT_
restart pacemaker
(do this before installing drbd8-utils 8.4.3-0ubuntu0.
See also: https:/ /bugs.launchpad .net/ubuntu/ +source/ drbd8/+ bug/1314598