[Libguestfs] Libguestfs Hangs on CentOS 7.4

[Phill Bandelow]

Thanks for the info. I can confirm doing the following works:

yum install centos-release-qemu-ev
yum install qemu-kvm-ev

libguestfs-test-tool completes in 3 seconds.





On 11 December 2017 at 16:49, Phill Bandelow <phill at onapp.com> wrote:

> (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 <+44%207883%20442300>
> Email: phill at onapp.com
> Web: solusvm.com | onapp.com
>



-- 
Regards,

Phill Bandelow
SolusVM Team Lead | OnApp Ltd
Direct Phone: +44 7883 442 300
Email: phill at onapp.com
Web: solusvm.com | onapp.com
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