Re: qemu and qemu.git -> Migration + disk stress introduces qcow2 corruptions

[Juan Quintela <quintela@redhat.com>]

Lucas Meneghel Rodrigues <lmr@redhat.com> wrote:
> Hi guys, here I am, reporting yet another issue with qemu. This time,
> it's something that was first reported in January, and Juan proposed a
> patch for it:
>
> http://comments.gmane.org/gmane.comp.emulators.qemu/89009
>
> [PATCH 4/5] Reopen files after migration
>
> The symptom is, when running disk stress or any intense IO operation
> in guest while migrating it causes a qcow2 corruption. We've seen this
> consistently on the daily test jobs, both for qemu and qemu-kvm. The
> test that triggers it is autotest stress test running on a VM with
> ping-pong background migration.
>
> The fix proposed by Juan is on our RHEL branch and such a problem does
> not happen on the RHEL branch. So, what about re-considering Juan's
> patch, or maybe work out a solution that is satisfactory for the
> upstream maintainers?
>
> I'll open a launchpad bug with this report.

I have just sent:

[RFC PATCH 0/2] Fix migration with NFS & iscsi/Fiber channel

Only the 1st patch on that series are needed to fix that problem.  Could
you try it?

Thanks, Juan.