[Bug 712392] Re: qemu-img convert blocks other tasks

[Alvin]

You're right about the errors. Apparently I had a full snapshot, but it
doesn't make a difference.

Meanwhile, I've had the time to test this. It is easy to reproduce:

- Create a snapshot (1 is enough)
- Cause some I/O, like qemu-img convert (this does /not/ have to be the snapshotted volume)
- Watch your virtual machines crash and/or your system burn

Doing the same qemu-img without any snapshots present is no problem.

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https://bugs.launchpad.net/bugs/712392

Title:
  qemu-img convert blocks other tasks