Comment 1 for bug 814256

Not sure if you want to track this here, or treat it as a new problem, but I tried todays image/hwpack (20110723) with the latest linaro-media-create and got it to leak loopback devs again. Here's the traceback:

Writing inode tables: done
Creating journal (16384 blocks): done
Writing superblocks and filesystem accounting information: done

This filesystem will be automatically checked every 26 mounts or
180 days, whichever comes first. Use tune2fs -c or -i to override.
`/tmp/tmpLRavw0/binary/usr/lib/u-boot/omap4_panda/u-boot.bin' -> `/tmp/tmpLRavw0/boot-disc/u-boot.bin'
Traceback (most recent call last):
  File "/home/plars/work/linaro/linaro-image-tools/linaro-media-create", line 161, in <module>
    args.is_live, args.is_lowmem, args.consoles)
  File "/home/plars/work/linaro/linaro-image-tools/linaro_image_tools/media_create/boards.py", line 483, in populate_boot
    rootfs_uuid, boot_disk, boot_device_or_file)
  File "/home/plars/work/linaro/linaro-image-tools/linaro_image_tools/media_create/boards.py", line 570, in make_boot_files
    cls.set_appropriate_serial_tty(chroot_dir)
  File "/home/plars/work/linaro/linaro-image-tools/linaro_image_tools/media_create/boards.py", line 560, in set_appropriate_serial_tty
    minor_version = re.match('.*2\.6\.([0-9]{2}).*', basename).group(1)
AttributeError: 'NoneType' object has no attribute 'group'
loop: can't delete device /dev/loop0: Device or resource busy
Error in atexit._run_exitfuncs:
Traceback (most recent call last):
  File "/usr/lib/python2.7/atexit.py", line 24, in _run_exitfuncs
    func(*targs, **kargs)
  File "/home/plars/work/linaro/linaro-image-tools/linaro_image_tools/media_create/partitions.py", line 234, in undo
    cmd_runner.run(['losetup', '-d', device], as_root=True).wait()
  File "/home/plars/work/linaro/linaro-image-tools/linaro_image_tools/cmd_runner.py", line 100, in wait
    raise SubcommandNonZeroReturnValue(self._my_args, returncode)
SubcommandNonZeroReturnValue: Sub process "['losetup', '-d', '/dev/loop0']" returned a non-zero value: 1
Error in sys.exitfunc:
Traceback (most recent call last):
  File "/usr/lib/python2.7/atexit.py", line 24, in _run_exitfuncs
    func(*targs, **kargs)
  File "/home/plars/work/linaro/linaro-image-tools/linaro_image_tools/media_create/partitions.py", line 234, in undo
    cmd_runner.run(['losetup', '-d', device], as_root=True).wait()
  File "/home/plars/work/linaro/linaro-image-tools/linaro_image_tools/cmd_runner.py", line 100, in wait
    raise SubcommandNonZeroReturnValue(self._my_args, returncode)
linaro_image_tools.cmd_runner.SubcommandNonZeroReturnValue: Sub process "['losetup', '-d', '/dev/loop0']" returned a non-zero value: 1