CentOS - Jul 2018 - Panic with EL7 KVM guest on EL6 host on AMD server with latest kernel

Hi,

I have AMD servers running CentOS 6.10 as KVM host and on it guests
running CentOS 7.5.

Since the latest kernel update on CentOS 6.10,
kernel-2.6.32-754.2.1.el6.x86_64, I can't boot the CentOS 7.5 guests with
kernel-3.10.0-862.6.3.el7.x86_64 anymore.

Reverting CentOS 6.10 host to kernel-2.6.32-754.el6.x86_64 fixes the problem.

Screendump of the panic is attached, not very helpful I guess.

The CPU models where I could test it are:

cpu family	: 15
model		: 65
model name	: Dual-Core AMD Opteron(tm) Processor 2218
stepping	: 3

cpu family      : 16
model           : 6
model name      : AMD Athlon(tm) II Neo N36L Dual-Core Processor
stepping        : 3

Didn't test on newer CPU family yet.

I'm wondering, does someone see the same issue? Does it not happen on
Intel CPUs?

Thanks for any insight.

Regards,
Simon

> Hi,
>
> I have AMD servers running CentOS 6.10 as KVM host and on it guests
> running CentOS 7.5.
>
> Since the latest kernel update on CentOS 6.10,
> kernel-2.6.32-754.2.1.el6.x86_64, I can't boot the CentOS 7.5 guests
with
> kernel-3.10.0-862.6.3.el7.x86_64 anymore.
>
> Reverting CentOS 6.10 host to kernel-2.6.32-754.el6.x86_64 fixes the
> problem.
>
> Screendump of the panic is attached, not very helpful I guess.
I didn't know attachments are stripped by the list.

Here is the bugreport:

https://bugs.centos.org/view.php?id=15067

My feeling is that the recent Intel fixes/workarounds have broken it here
for AMD systems :(

Regards,
Simon

On 07/17/2018 02:00 AM, Simon Matter wrote:
>> Hi,
>>
>> I have AMD servers running CentOS 6.10 as KVM host and on it guests
>> running CentOS 7.5.
>>
>> Since the latest kernel update on CentOS 6.10,
>> kernel-2.6.32-754.2.1.el6.x86_64, I can't boot the CentOS 7.5
guests with
>> kernel-3.10.0-862.6.3.el7.x86_64 anymore.
>>
>> Reverting CentOS 6.10 host to kernel-2.6.32-754.el6.x86_64 fixes the
>> problem.
>>
>> Screendump of the panic is attached, not very helpful I guess.
> 
> I didn't know attachments are stripped by the list.
> 
> Here is the bugreport:
> 
> https://bugs.centos.org/view.php?id=15067
> 
> My feeling is that the recent Intel fixes/workarounds have broken it here
> for AMD systems :(
> 
I had to set my CPU type to opteron_g3 instead of opteron_g5 for some
machines on an AMD server.

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