[Bug 1556451] Re: xenial lvm2-monitor.service fails with lvm raid1 volumes

[Launchpad Bug Tracker]

This bug was fixed in the package lvm2 - 2.02.133-1ubuntu10

---------------
lvm2 (2.02.133-1ubuntu10) xenial; urgency=medium

  * Cherry-pick change from lvm2 2.02.133-2 in Debian to move event plugins
    back onto the main library patch, which fixes problems with monitoring
    failing for snapshots and raid volumes.  Closes: #807279, LP: #1556451,
    LP: #1561228.

 -- Steve Langasek <steve.langasek at ubuntu.com>  Sat, 16 Apr 2016
00:06:53 -0700

** Changed in: lvm2 (Ubuntu)
       Status: New => Fix Released

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Title:
  xenial lvm2-monitor.service fails with lvm raid1 volumes

Status in lvm2 package in Ubuntu:
  Fix Released

Bug description:
  After installing xenial using the daily ubuntu-server installer,
  creating an LVM volume for the root filesystem, I lvconverted it into
  a raid1 mirror for redundancy over the pair of SSDs installed (as
  separate LVM PVs):

      sudo lvconvert -m 1 --type raid1 bonk/bonk1 /dev/sdc1 /dev/sdd1

  After a reboot, the lvm2-monitor.service fails. Relevant lines from
  journalctl:

  	$ sudo journalctl | grep -iE '(lvm|dmeventd)'
  	Mar 12 19:32:48 bonk1 systemd[1]: Listening on LVM2 metadata daemon socket.
  	Mar 12 19:32:48 bonk1 systemd[1]: Listening on LVM2 poll daemon socket.
  	Mar 12 19:32:48 bonk1 systemd[1]: Starting Monitoring of LVM2 mirrors, snapshots etc. using dmeventd or progress polling...
  	Mar 12 19:32:49 bonk1 systemd[1]: Started LVM2 metadata daemon.
  	Mar 12 19:32:52 bonk1 dmeventd[1039]: dmeventd libdevmapper-event-lvm2raid.so dlopen failed: libdevmapper-event-lvm2raid.so: cannot open shared object file: No such file or directory.
  	Mar 12 19:32:52 bonk1 dmeventd[1039]: dmeventd libdevmapper-event-lvm2raid.so dlopen failed: libdevmapper-event-lvm2raid.so: cannot open shared object file: No such file or directory.
  	Mar 12 19:32:52 bonk1 dmeventd[1039]: dmeventd libdevmapper-event-lvm2raid.so dlopen failed: libdevmapper-event-lvm2raid.so: cannot open shared object file: No such file or directory.
  	Mar 12 19:32:59 bonk1 lvm[556]:   Monitoring bonk/bonk1 failed.
  	Mar 12 19:32:59 bonk1 lvm[556]:   4 logical volume(s) in volume group "bonk" monitored
  	Mar 12 19:32:59 bonk1 systemd[1]: lvm2-monitor.service: Main process exited, code=exited, status=5/NOTINSTALLED
  	Mar 12 19:32:59 bonk1 systemd[1]: Failed to start Monitoring of LVM2 mirrors, snapshots etc. using dmeventd or progress polling.
  	Mar 12 19:32:59 bonk1 systemd[1]: lvm2-monitor.service: Unit entered failed state.
  	Mar 12 19:32:59 bonk1 systemd[1]: lvm2-monitor.service: Failed with result 'exit-code'.
  	Mar 12 19:33:00 bonk1 dmeventd[1039]: dmeventd libdevmapper-event-lvm2raid.so dlopen failed: libdevmapper-event-lvm2raid.so: cannot open shared object file: No 
  such file or directory.
  	Mar 12 19:33:08 bonk1 systemd-udevd[662]: Process 'watershed sh -c '/sbin/lvm vgscan; /sbin/lvm vgchange -a y'' failed with exit code 5.
  	Mar 12 19:33:08 bonk1 dmeventd[1039]: dmeventd libdevmapper-event-lvm2raid.so dlopen failed: libdevmapper-event-lvm2raid.so: cannot open shared object file: No such file or directory.
  	Mar 12 19:33:16 bonk1 systemd-udevd[655]: Process 'watershed sh -c '/sbin/lvm vgscan; /sbin/lvm vgchange -a y'' failed with exit code 5.

  The .so file is present and installed as part of dmeventd:

  	$ dpkg -S libdevmapper-event-lvm2raid.so
  	dmeventd: /lib/x86_64-linux-gnu/device-mapper/libdevmapper-event-lvm2raid.so

  This may be related to Debian's lvm2 2.02.133-2 change:

      * Drop event plugin directory move.  This moves the plugins back into
       the main library path. (closes: #807279)

  See:

      https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=807279

  --- 
  $ apt-cache policy lvm2 dmeventd 
  lvm2:
    Installed: 2.02.133-1ubuntu7
    Candidate: 2.02.133-1ubuntu7
    Version table:
   *** 2.02.133-1ubuntu7 500
  	500 http://fi.archive.ubuntu.com/ubuntu xenial/main amd64 Packages
  	100 /var/lib/dpkg/status
  dmeventd:
    Installed: 2:1.02.110-1ubuntu7
    Candidate: 2:1.02.110-1ubuntu7
    Version table:
   *** 2:1.02.110-1ubuntu7 500
  	500 http://fi.archive.ubuntu.com/ubuntu xenial/main amd64 Packages
  	100 /var/lib/dpkg/status

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