Tested with linux 4.4.0-139-generic #165 and zfsutils 0.6.5.6-0ubuntu26
- marking as verified for xenial

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https://bugs.launchpad.net/bugs/1769937

Title:
  Error reported when creating ZFS pool with "-t" option, despite
  successful pool creation

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

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

  Bug:

  When creating a pool with the -t option on Ubuntu 18.04 LTS, it will
  report an error and return a non-zero exit code, but the pool appears
  to be successfully created.

  For example:

  # zpool create -O canmount=off -O mountpoint=none -R /mnt/rpool-25582 -t 
rpool-25582 rpool /dev/mapper/loop2p1
  cannot create 'rpool': no such pool or dataset
  # zpool list
  NAME          SIZE  ALLOC   FREE  EXPANDSZ   FRAG    CAP  DEDUP  HEALTH  
ALTROOT
  rpool-25582  69.5G  92.5K  69.5G         -     0%     0%  1.00x  ONLINE  
/mnt/rpool-25582
  # zpool export rpool-25582
  # zpool import rpool
  # zpool list
  NAME    SIZE  ALLOC   FREE  EXPANDSZ   FRAG    CAP  DEDUP  HEALTH  ALTROOT
  rpool  69.5G   134K  69.5G         -     0%     0%  1.00x  ONLINE  -

  I opened an upstream bug against ZFS on Linux, here:
  https://github.com/zfsonlinux/zfs/issues/7502

  And it has been recently fixed, here:
  https://github.com/zfsonlinux/zfs/pull/7509

  Can this upstream fix be pulled into the Ubuntu 18.04 LTS packages?

  Thanks,
  Prakash

  == Fix ==

  Upstream zfs commit 4ceb8dd6fdfd ("Fix 'zpool create -t <tempname>'")

  == Test ==

  Without the fix, creating a pool with -t will show an error message
  such as:

  "cannot create 'rpool': no such pool or dataset" and will return an
  error number even though it successfully created the pool. With the
  fix, the error is not shown and it exits with 0.

  E.g.

  pool create -O canmount=off -O mountpoint=none -R /mnt/rpool-25582 -t 
rpool-25582 rpool /dev/mapper/loop2p1 
  cannot create 'rpool': no such pool or dataset

  == Regression Potential ==

  Small. This is an upstream fix that is know to fix the error. There
  are no known subsequent changes to the fix hence suggesting it is a
  good fix. The change is very limited and testing shows it does not
  break any of the kernel team's ZFS regression testing.

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