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[Chris J Arges <1359146@xxxxxxxxxxxxxxxxxx>]

I can easily reproduce the issue; and it seems that this is a regression between 3.13 (where this works) and 3.16.
I'll work on doing a regression bisect. It may end up being one or two issues as there is a warn on boot before mounting, and when mounting /dev/bcache0 we get the crash.

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

** Changed in: linux (Ubuntu)
     Assignee: (unassigned) => Chris J Arges (arges)

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https://bugs.launchpad.net/bugs/1359146

Title:
  Kernel crash when mounting bcache on a vm with virtio

Status in “linux” package in Ubuntu:
  Confirmed
Status in “linux” source package in Trusty:
  Fix Released

Bug description:
  bcache used in a virtual machine:

  If you create a bcache device with caching device and backing device
  on virtio disks, it will let you do your work until you mount it where
  it crashes the virtual machine (virtual machine is utopic, host is
  trusty).

  For example:
  if your backing device is /dev/vdb, and your caching device is /dev/vdc:

  sudo make-bcache -B /dev/vdc -C /dev/vdb --writeback
  is ok

  mkfs.ext4 /dev/bcache0 -L bcache-test
  is ok

  but
  mount /dev/bcache0 /media/bcache

  make it crash, if I remember well one time I had a few seconds before
  crash, but I don't have any log files.

  qemu-system-x86 is version 2.0.0+dfsg-2ubuntu1.2

  Re-installing, and using IDE virtual interface seems to create and
  mount the bcache device is ok.

  After bcache created an mounted successfully with IDE interfaces,
  switching to SATA, SCSI, and USB with booting and mounting seemed ok.

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