[CentOS] Panic / EL6 / KVM / kernel-2.6.32-754.2.1.el6.x86_64

Thu Aug 30 10:23:04 UTC 2018
isdtor <isdtor at gmail.com>

> >>> Does some one have problems related to KVM with
> >>> kernel-2.6.32-754.3.5.el6.x86_64 ??
> >>
> >> Yes, the exact same thing happened here, and I suspect it is related to
> >> older cpus that don't get any Spectre/Meltdown updates.
> >
> >
> > Thanks for the feedback. I' was assuming that some kind of
> > Spectre/Meltdown fixes are causing this.
> >
> Doesn downgrading qemu as I proposed in the other mail fix it in your case?
> I'm interested because in my case I'm having the issue on two older AMD
> CPUs, not Intel.
Simon, downgrading does not fix the problem in my case. I upgraded to the 3.5 kernel, disabled libvirtd and libvirtd-guests, and rebooted. Once the machine was up, I started the libvirtd service and the machine crashed immediately.

Old: qemu-img-, qemu-kvm- (crash on 2.6.32-754.3.5)
New: qemu-img-,  qemu-kvm-  (crash on 2.6.32-754.3.5)

In Leon's and my case, the culprit is kernel 2.6.32-754.3.5. In CentOS bug 0015067, the bad kernel is 2.6.32-754.2.1, wich works fine here. The difference might be how different cpus are handled.