[Libguestfs] Libguestfs Hangs on CentOS 7.4

[Richard W.M. Jones]

I found the serial port hang bug:

  https://bugzilla.redhat.com/show_bug.cgi?id=1435432

It was caused by a bad glib2 change.

During RHEL 7 development we managed to introduce the same bug:

  https://bugzilla.redhat.com/show_bug.cgi?id=1473605

and I notice that we didn't fix it in glib2, but we worked around it
in qemu-kvm, but CentOS probably doesn't have the 7.4-z fix with that
workaround.

I've no idea why NVMe would be a common factor here, or even if this
is really the bug that you're seeing, but the easy fix would be to try
using qemu-kvm-ev instead of qemu-kvm.

Rich.

-- 
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
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