[Bug 1607920] Re: zfs services fail on firstboot if zfs-utils is integrated into the deployment image

[Andy Whitcroft]

Hello Dave, or anyone else affected,

Accepted zfs-linux into xenial-proposed. The package will build now and
be available at https://launchpad.net/ubuntu/+source/zfs-
linux/0.6.5.6-0ubuntu14 in a few hours, and then in the -proposed
repository.

Please help us by testing this new package.  See
https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to
enable and use -proposed.  Your feedback will aid us getting this update
out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug,
mentioning the version of the package you tested, and change the tag
from verification-needed to verification-done. If it does not fix the
bug for you, please add a comment stating that, and change the tag to
verification-failed.  In either case, details of your testing will help
us make a better decision.

Further information regarding the verification process can be found at
https://wiki.ubuntu.com/QATeam/PerformingSRUVerification .  Thank you in
advance!

** Changed in: zfs-linux (Ubuntu Xenial)
       Status: In Progress => Fix Committed

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https://bugs.launchpad.net/bugs/1607920

Title:
  zfs services fail on firstboot if zfs-utils is integrated into the
  deployment image

Status in sysvinit package in Ubuntu:
  Won't Fix
Status in zfs-linux package in Ubuntu:
  Fix Released
Status in sysvinit source package in Xenial:
  Won't Fix
Status in zfs-linux source package in Xenial:
  Fix Committed

Bug description:
  [Impact]

   * zfs services fail on firstboot if zfs-utils is integrated into the
  deployment image.

   * Output from systemd -
  sudo systemctl --failed
  UNIT LOAD ACTIVE SUB DESCRIPTION
  ● zfs-import-scan.service loaded failed failed Import ZFS pools by device scanning
  ● zfs-mount.service loaded failed failed Mount ZFS filesystems

   * This is particularly frustrating for users who use automated
  monitoring as it means virtual machines must always be restarted
  before showing as clean.

   * This failure is due to zfs services starting up before /etc/mtab
  has a chance to be symlinked to /proc/mounts.

  [Test Case]

   1. Grab a stock xenial image, and unpack it and add zfs-utils to it.  Repack it.
   2. Boot machine
   3. Check systemctl --failed.

  [Regression Potential]

   * none expected, patch has been intensively tested by the upsteam zfs
  test script suite.

   * This is a upstream commit merge in 0.7.0.

   * A ubuntu package has been tested (including the upstream commit) by
  a user of the community facing this bug, and confirmed it addresses
  the problem (see comment #7).

  [Other Info]

  * The "reading" is redirected to /proc/self/mounts. 
  The writing to /etc/mtab. Some distros still need that. The current hope is to replace the writing (and maybe reading) with libmount, in a second phase.

  
   * Upstream commit : https://github.com/zfsonlinux/zfs/commit/792517389fad5c495a2738b61c2e9c65dedaaa9a

   * Upstream bug: https://github.com/zfsonlinux/zfs/issues/4680

   * Debian bug : https://bugs.debian.org/cgi-
  bin/bugreport.cgi?bug=839071

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