[Xen-users] MCE logs and CPU issue

[Sylvain Chevalier <sylvain.chevalier@xxxxxxxxx>]

Hi,

On one of our servers running xen, we see many instances like this in
/var/log/messages on dom0:

Feb  2 17:45:11 maradona kernel: [172988.068048] MCE_DOM0_LOG: enter
dom0 mce vIRQ handler
Feb  2 17:45:11 maradona kernel: [172988.068050] MCE_DOM0_LOG: No more
urgent data
Feb  2 17:45:11 maradona kernel: [172988.068056] [CPU8, BANK12, addr
cf839a00, state cc0035400001009f]
Feb  2 17:45:11 maradona kernel: [172988.068059] MCE_DOM0_LOG: No more
nonurgent data

it is always CPU8, BANK12. And the server will sometimes just abruptly
reboot after logging this.

Does it mean that MCE messages are logged by xen in /var/log/messages
and that there is a problem with this cpu? Do you know how I can dig
further and find what the problem is?

Meanwhile, I have set dom0_max_vcpus=1 dom0_vcpus_pin, so my
understanding is that dom0 only uses cpu0. Does it mean that the
problem reported is about a cpu that is only used by a domU?

Thanks a lot for any light on this,

Sylvain

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