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[Brad Figg <brad.figg@xxxxxxxxxxxxx>]

This bug is missing log files that will aid in diagnosing the problem.
>From a terminal window please run:

apport-collect 1560869

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable
to run this command, please add a comment stating that fact and change
the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the
Ubuntu Kernel Team.

** Changed in: linux (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1560869

Title:
  Concurrent zfs create and rename operations can lock a zpool
  completely

Status in linux package in Ubuntu:
  Incomplete
Status in zfs-linux package in Ubuntu:
  New

Bug description:
  When doing "zfs create -V" and "zfs rename" operations on the same
  zpool in parallel, there is a high chance for a deadlock leading to a
  complete hang of the zpool in question (i.e., all further zfs
  operations hang indefinitely).

  Attached you find a simple perl script that should trigger the bug
  (the pool variable needs to be set to your pool name), if run in two
  shells at the same time:

  $ for i in `seq 1 100`; do sudo ./zfsrenamebug.pl "A$i"; done

  $ for i in `seq 1 100`; do sudo ./zfsrenamebug.pl "B$i"; done

  Reported upstream in https://github.com/zfsonlinux/zfs/issues/4404 and
  apparently fixed with the linked commits.

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