[CentOS] qemu-kvm-common-ev-2.12.0-18.el7_6.1.1.x86_64 - lost KVM guests - qemu-kvm-ev

Tue Dec 18 12:37:09 UTC 2018
lejeczek <peljasz at yahoo.co.uk>

On 17/12/2018 18:54, Jonathan Billings wrote:
> On Mon, Dec 17, 2018 at 01:52:40PM -0500, Jonathan Billings wrote:
>> On Mon, Dec 17, 2018 at 05:50:44PM +0000, lejeczek via CentOS wrote:
>>> I updated to qemu-kvm-common-ev-2.12.0-18.el7_6.1.1.x86_64 (also libvirt)
>>> and my Centos 6.10 kvm guests now do not start.
>>> Funnily enough Win10 guest are fine, only Centoses cannot start, silently &
>>> without any errors.
>>> Any care to comment?
>> It looks like you installed CentOS 7 packages on a CentOS 6 system.
>> I'm amazed it even worked.  Try removing the packages and
>> re-installing the appropriate packages for CentOS 6.
> Oh, never mind me, I missed that you were saying that your *GUESTS*
> don't start.
> Did you do a full update to CentOS 7.6.1810, or just the libvirt/qemu packages?
yes, I see my sentence was not complete, although it non-explicitly said 
Centos 7 (qemu package version).

So, host is Centos 7 updated to the latest (no fasttrack repo, but 
cr(rolling) yes) and quests are(if not gone now?)  Centos 6.10.

virsh start such a guest okey, complains of nothing, no errors but guess 
does not boot. I see qemu BIOS and boot menu but when it comes to 
booting the OS/grub/kernel, then this does not happen.

Checking qcow image with qemu confirms images are free of errors, etc. I 
can mount these Centos guests okey, filesystem seems good.

I do not want to downgrade just yet, but will have to check that option