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

apport-collect 1683976

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/1683976

Title:
  Please backport fix to reference leak in cgroup blkio throttle

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  This is fixed in Linux 4.5
  
https://github.com/torvalds/linux/commit/39a169b62b415390398291080dafe63aec751e0a

  Basically the module reference will leak whenever you write to
  /sys/fs/cgroup/blkio/blkio.throttle.*

  $ uname -a
  Linux david-kvm 4.4.0-72-generic #93-Ubuntu SMP Fri Mar 31 14:07:41 UTC 2017 
x86_64 x86_64 x86_64 GNU/Linux
  $ lsmod | grep ^zfs
  zfs                  2813952  1
  $ sudo sh -c 'i=100; while [ $i -gt 0 ]; do echo "230:0 1024" > 
/sys/fs/cgroup/blkio/blkio.throttle.read_bps_device; i=$(($i - 1)); done'
  $ lsmod | grep ^zfs
  zfs                  2813952  101

  This patch should be applied to all kernel < 4.5

  Thanks

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