Maybe the libvirtd < - > libgfapi communication is somehow broken.
I'm using FUSE and I have no issues, but my lab is not I/O intensive .

Have you noticed if the issue happens during I/O (for example - full backup) intensive load?

You can even try to stop using libgfapi and check if it happens again.

Best Regards,
Strahil NikolovOn Aug 3, 2019 00:39, Darrell Budic <budic@onholyground.com> wrote:
>
> I’ve been seeing similar issues lately (since upgrading to 4.3.4 and later) with gluster storage (and libgfapi), but haven’t pinned to anything particular yet. But libvirt seems to have some issues and vdsmd stops being able to poll disk usage. My VMs don’t crash or stop working, but they do report as ? in the management interface and can’t be migrated. Current work around is to restart libvirtd then vdsmd, occasionally restarting libvirtd restarts a VM (presumably the one that had broken some disk something…).
>
> Sorry I don’t have more info to go on, but I’ll update here if I get more on anything similar.
>
>   -Darrell
>
> > On Aug 2, 2019, at 9:23 AM, kevin.doyle@manchester.ac.uk wrote:
> >
> > HI
> > I think it is a bug with qemu, and isci disks. Has anyone else seen this issue VM crashes and lost communication with qemu Can I update qemu ? if so what is the latest support version to use on Ovirt 4.3.2.1-1.el7 Current versions of qemu installed
> >
> > Installed Packages
> > qemu-img-ev.x86_64 10:2.12.0-18.el7_6.3.1
> > qemu-kvm-common-ev.x86_64 10:2.12.0-18.el7_6.3.1
> > qemu-kvm-ev.x86_64 10:2.12.0-18.el7_6.3.1
> >
> > Many thanks
> > Kevin
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