Re: [Libguestfs] Libguestfs Hangs on CentOS 7.4

(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(a)redhat.com&gt; 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(a)onapp.com Web: solusvm.com | onapp.com