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[Bug 1437414] Re: kernel unable to unmount loopbacks & leaks them

 

i've received word from a coworker that their trusty kernel
(3.13.0-48-generic) is hitting this reliably as well

apport-collect fails for me:
$ apport-collect 1437414
Traceback (most recent call last):
  File "/usr/bin/apport-cli", line 370, in <module>
    if not app.run_argv():
  File "/usr/lib/python2.7/dist-packages/apport/ui.py", line 652, in run_argv
    return self.run_update_report()
  File "/usr/lib/python2.7/dist-packages/apport/ui.py", line 524, in run_update_report
    pkgs = self.crashdb.get_affected_packages(self.options.update_report)
  File "/usr/lib/python2.7/dist-packages/apport/crashdb_impl/memory.py", line 79, in get_affected_packages
    return [self.reports[id]['report']['SourcePackage']]
IndexError: list index out of range

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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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References