On Fri, Jan 26, 2018 at 8:08 AM, Andreas Manschke <[log in to unmask]> wrote: > Dear colleagues, > > just to inform you about a problem I have/had: > > Xen host: SL5 kernel-xen-2.6.18-419.el5.x86_64 ,xen-3.0.3-148.el5_11.x86_64, libvirt-0.8.2-29.el5_9.1.x86_64 > Xen guest: SL6 kernel 2.6.32-696.16.1.el6.x86_64, kernel-firmware-2.6.32-696.18.7.el6 > > Guest runs fine. yum update -> kernel-2.6.32-696.18.7.el6.x86_64 > Guest does not boot. Using the graphical virt-manager display you don't see anything. Only machine crashed. > > Workaround: > Add > extra = "(hd0)/boot/grub/menu.lst" > to /etc/xen/guest > > xm create -c guest > > Select older kernel, boot, yum remove kernel-2.6.32-696.18.7.el6.x86_64 > > Perhaps a problem with Spectre/Meltdown handling? This is not unlikely. Why are you continuing with SL 5? RHEL 5 is now over 10 years old and is no longer getting ordinary maintenance updates. Sounds like time to upgrade.