[Libguestfs] Libguestfs Hangs on CentOS 7.4

[Phill Bandelow]

(1) This made no difference. It still hangs around the same place.

(2) It wasn't enabled in the kernel so i enabled it. I then rebooted but
unfortunately it made no difference.

If you want access to a hypervisor to have a play around, let me know.

The only information i really have is that if i installed CentOS 7.3 on
this hypervisor it works fine.

On 11 December 2017 at 16:24, Richard W.M. Jones <rjones at redhat.com> wrote:

> On Mon, Dec 11, 2017 at 02:28:31PM +0000, Phill Bandelow wrote:
> > Hi,
> >
> > We seem to be hitting an issue where libguestfs keeps hanging.
> virt-resize,
> > guestmount etc.. never complete. If we set
> > LIBGUESTFS_BACKEND_SETTINGS=force_tcg it completes.
> >
> > The issue starts when updating to CentOS 7.4 (CentOS 7.3 work fine). It
> > doesn't seem to affect all 7.4 hypervisors and the only similarity that
> we
> > have found is that they all use NVMe drives.
>
> I've seen this issue before where the UART hangs, and I can't put my
> finger on what was causing it right now.
>
> At any rate there's a few things you can look into:
>
> (1) Try with LIBGUESTFS_BACKEND=direct (without forcing TCG).
>
> (2) Is it using nested KVM?  Is nested KVM enabled in the KVM
> module in the host kernel:
>
>   # systool -m kvm_intel -v | grep nested
>
> (should say "Y" if yes)
>
> If nested KVM is enabled, you can disable it (probably requires a
> reboot unfortunately).  Or if disabled, try enabling it.
>
> Rich.
>
> --
> Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~
> rjones
> Read my programming and virtualization blog: http://rwmj.wordpress.com
> virt-p2v converts physical machines to virtual machines.  Boot with a
> live CD or over the network (PXE) and turn machines into KVM guests.
> http://libguestfs.org/virt-v2v
>



-- 
Regards,

Phill Bandelow
SolusVM Team Lead | OnApp Ltd
Direct Phone: +44 7883 442 300
Email: phill at onapp.com
Web: solusvm.com | onapp.com
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://listman.redhat.com/archives/libguestfs/attachments/20171211/10abf677/attachment.htm>