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[Peter Moody <pmoody@xxxxxxxxxx>]

Turns out that the bug is in a kernel module we develop/maintain in-
house.

mea-culpa.

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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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