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[Kick In <pierre-andre.morey@xxxxxxxxxxxxx>]

Public bug reported:

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.

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.

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New

** Description changed:

  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 
+ 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.
  
  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.

** Description changed:

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

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

Status in “linux” package in Ubuntu:
  New

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.

  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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