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[Bug 1571761] Re: zfs-import-cache.service slows boot by 60 seconds


An SRU upload of cloud-init for 16.04 that contains a fix for this bug has been made under bug 1595302.  Please track that bug if you are interested.

** Also affects: cloud-init (Ubuntu Xenial)
   Importance: Undecided
       Status: New

** Also affects: zfs-linux (Ubuntu Xenial)
   Importance: Undecided
       Status: New

** Changed in: cloud-init (Ubuntu Xenial)
       Status: New => Fix Released

** Changed in: cloud-init (Ubuntu Xenial)
       Status: Fix Released => In Progress

** Changed in: cloud-init (Ubuntu Xenial)
   Importance: Undecided => High

** Changed in: cloud-init (Ubuntu Xenial)
     Assignee: (unassigned) => Scott Moser (smoser)

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  zfs-import-cache.service slows boot by 60 seconds

Status in cloud-init package in Ubuntu:
  Fix Released
Status in zfs-linux package in Ubuntu:
Status in cloud-init source package in Xenial:
  In Progress
Status in zfs-linux source package in Xenial:

Bug description:
  Fresh uvt-kvm guest, then
  $ sudo apt-get install zfsutils-linux
  $ sudo reboot

  The reboot will show on console waiting for tasks, then after ~ 60 seconds it continues boot.
  Logging in shows:

  $ sudo systemd-analyze critical-chain zfs-mount.service
  The time after the unit is active or started is printed after the "@" character.
  The time the unit takes to start is printed after the "+" character.

  zfs-mount.service +81ms
  └─zfs-import-cache.service @1min 786ms +272ms
    └─systemd-udev-settle.service @494ms +1min 275ms
      └─systemd-udev-trigger.service @415ms +55ms
        └─systemd-udevd-control.socket @260ms
          └─-.mount @124ms
            └─system.slice @129ms
              └─-.slice @124ms

  Seems possibly related / or some discussion at

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: zfsutils-linux
  ProcVersionSignature: User Name 4.4.0-18.34-generic 4.4.6
  Uname: Linux 4.4.0-18-generic x86_64
  NonfreeKernelModules: zfs zunicode zcommon znvpair zavl
  ApportVersion: 2.20.1-0ubuntu1
  Architecture: amd64
  Date: Mon Apr 18 16:42:35 2016
   PATH=(custom, no user)
  SourcePackage: zfs-linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  modified.conffile..etc.sudoers.d.zfs: [deleted]

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