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[Stefan Bader <stefan.bader@xxxxxxxxxxxxx>]

As 3.16 is claimed to be ok this is fixed in the development tree.

** Changed in: linux (Ubuntu)
       Status: Confirmed => Fix Released

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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:
  Fix Released
Status in linux source package in Trusty:
  Confirmed

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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