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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 1425128

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

** Tags added: trusty

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https://bugs.launchpad.net/bugs/1425128

Title:
  bcache causes task hang with 3.13 kernel

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  We're doing some testing of bcache to see how it improves block
  performance in trusty; right now we're hitting a problem where
  processes performing filesystem operations get hung on the default
  3.13 kernel:

   [ 7083.029073] INFO: task qemu-img:96548 blocked for more than 120 seconds.
   [ 7083.035797]       Not tainted 3.13.0-45-generic #74-Ubuntu
   [ 7083.041325] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.

  we don't see the same issue if we switch to the 3.16 hwe kernel.

  Fairly easy to reproduce so can try test kernels - will also try to
  get a bit more debug for you on this one.

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