[CentOS] Panic with EL7 KVM guest on EL6 host on AMD server with latest kernel

[Simon Matter]

> On 07/17/2018 04:48 PM, Johnny Hughes wrote:
>> 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.
>
>
> This was the bug I hit ... not your scenario .. but who knows:
>
> https://bugzilla.redhat.com/show_bug.cgi?id=1586278

Looks like your scenario was really quite different.

BTW, I've just tested with kernel-3.10.0-862.9.1.el7.x86_64 on the CentOS
7 guest and it still crashes the same way.

Regards,
Simon