[Bug 583530] Re: vm-builder 0.12.3-0ubuntu1 crashes and causes loop devices to be stuck

[GeekSmith]

I'm seeing this any time vmbuilder fails.  If it fails more than a few
times, I run out of loopback devices and can't build anything more.
Here are the loopback devices it leaves for a VM with two hard disks:

I'm able to clean up the loopback devices manually, but it's quite a pain:
aaron.smith at asmith ~/dvp/vm % sudo losetup -a
/dev/loop0: [0801]:678634 (/tmp/tmpZjs7XP)
/dev/loop1: [0801]:678638 (/tmp/tmpFfS6q9)
aaron.smith at asmith ~/dvp/vm % sudo losetup -d /dev/loop0
loop: can't delete device /dev/loop0: Device or resource busy
aaron.smith at asmith ~/dvp/vm % sudo kpartx -d /dev/loop0
aaron.smith at asmith ~/dvp/vm % sudo losetup -d /dev/loop0
aaron.smith at asmith ~/dvp/vm % sudo losetup -a
/dev/loop1: [0801]:678638 (/tmp/tmpFfS6q9)

-- OK, one down.  The last one is a litte more painful:
aaron.smith at asmith ~/dvp/vm % sudo dmsetup table
loop1p1: 0 15622984 linear 7:1 63
aaron.smith at asmith ~/dvp/vm % sudo kpartx -dv /dev/mapper/loop1p1 
aaron.smith at asmith ~/dvp/vm % sudo losetup -d /dev/mapper/loop1p1
aaron.smith at asmith ~/dvp/vm % sudo losetup -a                    
aaron.smith at asmith ~/dvp/vm % 

If a person is trying to automate creation of a VM in a build process,
this becomes burdensome.

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Title:
  vm-builder 0.12.3-0ubuntu1 crashes and causes loop devices to be stuck

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