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[Launchpad Bug Tracker <1760173@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package zfs-linux - 0.7.5-1ubuntu16.2

---------------
zfs-linux (0.7.5-1ubuntu16.2) bionic; urgency=medium

  * Revert previous fix, re-work by checking for
    a container using /run/systemd/container and
    set timeout to zero for zfs list or zpool status
    when running inside a container (LP: #1760173)

 -- Colin Ian King <colin.king@xxxxxxxxxxxxx>  Thu, 7 Jun 2018 17:25:12
+0100

** Changed in: zfs-linux (Ubuntu Bionic)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1760173

Title:
  zfs, zpool commands hangs for 10 seconds without a /dev/zfs

Status in lxd package in Ubuntu:
  Invalid
Status in zfs-linux package in Ubuntu:
  Fix Released
Status in zfs-linux source package in Xenial:
  Fix Committed
Status in zfs-linux source package in Artful:
  Fix Committed
Status in zfs-linux source package in Bionic:
  Fix Released
Status in zfs-linux source package in Cosmic:
  Fix Released

Bug description:
  == SRU Justification, Xenial, Artful, Bionic ==

  When outside a lxd container with zfs storage, zfs list or zpool
  status either returns or reports what's going on.

  When inside a lxd container with zfs storage, zfs list or zpool status
  appears to hang, no output for 10 seconds.

  == Fix ==

  Inside a container we don't need the 10 seconds timeout, so check for
  this scenario and set the timeout to default to 0 seconds.

  == Regression Potential ==

  Minimal, this caters for a corner case inside a containerized
  environment, the fix will not alter the behaviour for other cases.

  -----

  1. # lsb_release -rd
  Description:	Ubuntu 16.04.4 LTS
  Release:	16.04

  2. # apt-cache policy zfsutils-linux
  zfsutils-linux:
    Installed: 0.6.5.6-0ubuntu19
    Candidate: 0.6.5.6-0ubuntu19
    Version table:
   *** 0.6.5.6-0ubuntu19 500
          500 http://archive.ubuntu.com/ubuntu xenial-updates/main amd64 Packages
          100 /var/lib/dpkg/status

  3. When inside a lxd container with zfs storage, zfs list or zpool
  status either return or report what's going on.

  4. When inside a lxd container with zfs storage, zfs list or zpool
  status appears to hang, no output for 10 seconds.

  strace reveals that without a /dev/zfs the tools wait for it to appear
  for 10 seconds but do not provide a command line switch to disable or
  make it more verbose.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: zfsutils-linux 0.6.5.6-0ubuntu19
  ProcVersionSignature: Ubuntu 4.13.0-36.40~16.04.1-generic 4.13.13
  Uname: Linux 4.13.0-36-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.15
  Architecture: amd64
  Date: Fri Mar 30 18:09:29 2018
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   LANG=C.UTF-8
  SourcePackage: zfs-linux
  UpgradeStatus: No upgrade log present (probably fresh install)

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