[Libguestfs] Double fault panic in L2 upon v2v conversion

[Rom Freiman]

Thanks Richard for a fast reply.

Yes, indeed, im working on a nested environment. I try to run v2v inside a
VM (L1) and to create an L2 by the conversion process. And on Intel. As I
wrote, it fails once in few times, mainly when there is a memory pressure
on L0.

Kashyap, can you please share your experience? Why should it crash during
nested conversion. I'm not too familiar with libguestfs logic - maybe you
can point for me, according to the logs, at what stage of the conversion
the failure happens.

Thanks,
Rom


On Thu, Jan 16, 2014 at 5:23 PM, Richard W.M. Jones <rjones at redhat.com>wrote:

> On Wed, Jan 15, 2014 at 04:35:29PM +0200, Rom Freiman wrote:
> > Hi everybody,
> >
> > Wanted to hear your opinion and to receive a smart advice.
> >
> > I'm trying to use virt-v2v in order to convert ova image (exported from
> > vcenter) to run on libvirt/kvm - all this inside a VM of fedora.
> > The converted image is also a fedora.
> > During the conversion process, in some point of libguestfs activity, I
> get
> > double fault panic from L2 (printed as part of libguest output) and the
> > conversion process fails - no errors appear neither in L0 not in L1
> message
> > logs.
>
> Are you using nested KVM?
>
> Kashyap (CC'd) has done a lot of testing on nested KVM on *Intel*,
> never with satisfactory results.  It just doesn't work very well.
>
> On AMD is a different story -- nested KVM just works.
>
> Rich.
>
> --
> Richard Jones, Virtualization Group, Red Hat
> http://people.redhat.com/~rjones
> Fedora Windows cross-compiler. Compile Windows programs, test, and
> build Windows installers. Over 100 libraries supported.
> http://fedoraproject.org/wiki/MinGW
>
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