[Bug 198205] infinite loop in vmx_vcpu_run on x86_64

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https://bugzilla.kernel.org/show_bug.cgi?id=198205

--- Comment #3 from Mark Mielke (mark.mielke@gmail.com) ---
I should add some other clarifications:

1) The guests usually don't lock up on an idle host. To make it fail, I
normally need to busy the network and storage. This has a side effect of
busying the CPU, but I haven't seen CPU as a primary trigger for me.

2) The guests that lock up include both a CentOS 7 guest, and Fedora 27 guests.
The Fedora 27 guests had both Linux 4.13 and Linux 4.14. The Fedora 27 guests
are currently running Linux 4.14.11, and they locked up. The CentOS 7 guest is
Linux 3.10.0-514.21.1.el7.x86_64. There is no particular order to the failures.
The CentOS 7 guest seems to fail with the same probability and triggers as the
Fedora 27 guests.

3) The host uses OpenVSwitch 2.8.1. The guests are attached to an OVS bridge.
vhost-net is active. The host also uses LVM thin volumes mounted on Intel SSD
750 NVMe drives as backing store for the guest volumes.

4) Force Reset, or Force Off, then Force On, usually clears it for a particular
guest for a particular time. Also, the guest can be suspended and resumed. I
did play with setting up libvirt to run "qemu -s" and running remote GDB
debugger on the guests, but this was too new to me to make complete sense. I
was able to see it was spinning inside the guest (not on the host), but I
wasn't able to see what it was doing in the guest, or why it was doing it.

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