Public bug reported:

I am running an Ubuntu 16.04 server running on an HP Proliant chassis
with several lxc containers running on zfs.  While performing a series
of debian updates on the host and container, as well as container
destruction/creation, the kernel spits out a stack trace indicating that
the there was a hung task while it was performing writeback in zfs.

If I attempt to perform a "sync" command on the host, the command will
not return.  Also, if I attempt to reboot the server with the reboot
command, the server never reboots.   A power cycle is required.

** Affects: kernel-package (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: lxc zfs

** Attachment added: "apport.linux-image-4.4.0-71-generic.bogw9kc2.apport"
   
https://bugs.launchpad.net/bugs/1686604/+attachment/4868467/+files/apport.linux-image-4.4.0-71-generic.bogw9kc2.apport

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https://bugs.launchpad.net/bugs/1686604

Title:
  file system lockup with zfs hung task

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