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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 1437414

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

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https://bugs.launchpad.net/bugs/1437414

Title:
  kernel unable to unmount loopbacks & leaks them

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  run the attached script which:
   - creates a disk image
   - creates an ext2 fs in the middle of it
   - mounts that ext2 fs via loopback
   - deploys & runs some code in that mount
   - tries to unmount it

  the kernel ends up saying the mount is busy (it's not) and it's not
  possible to detach the loopback (probably because even with a lazy
  unmount, the kernel holds references to it)

  this is the utopic kernel 3.16.0-33

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