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Date: Sun, 23 Jan 2011 21:02:22 -0800
From: perryh@pluto.rain.com
To: dalroi@solfertje.student.utwente.nl
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Cc: stable@freebsd.org
Subject: Re: Machine check errors
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Alban Hertroys <dalroi@solfertje.student.utwente.nl> wrote:

> Ever since installing 7.4-PRERELEASE I'm seeing MCA machine check
> errors on my home-server ...
>
> MCA: Bank 0, Status 0xb622000000000135
> MCA: Global Cap 0x0000000000000104, Status 0x0000000000000004
> MCA: Vendor "AuthenticAMD". ID 0x662, APIC ID 1
> MCA: CPU 0 UNCOR PCC DCACHE L1 DRD error
                       ^^^^^^^^^
> MCA: Address 0x162933f0

That's an error in the on-chip data cache.

The first thing I would check is cooling.  Maybe one of the fans
has quit working, or the air filter (if the box has one) has gotten
clogged up with dust, so that the CPU is running hotter than it
should.