Re: [Libguestfs] Libguestfs Hangs on CentOS 7.4
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
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