meaning of events in /var/log/messages

[Mike Wright]

Hi all,

I've noticed that the messages log file has *many* of these.  Does 
anybody know what they mean?  Do they mean something good/bad/ugly/etc?

It's always a "mce_notify_irq" followed by four "Machine check events 
logged".

May 16 10:03:37 lan51 kernel: [73338.698074] mce_notify_irq: 28 
callbacks suppressed
May 16 10:03:37 lan51 kernel: [73338.698082] Machine check events logged
May 16 10:06:07 lan51 kernel: [73488.698064] Machine check events logged
May 16 10:07:22 lan51 kernel: [73563.698071] Machine check events logged
May 16 10:07:59 lan51 kernel: [73601.198071] Machine check events logged

f14 with 2.6.35.13-91.fc14.x86_64, all updates applied.

Happy to provide more info.

Thanks,
Mike Wright