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 soon.