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Date: Sun, 19 Apr 2015 22:52:17 +0200
From: Marius Strobl <marius@alchemy.franken.de>
To: Matthias Apitz <guru@unixarea.de>, freebsd-hackers@freebsd.org,
 Jeremy Chadwick <jdc@koitsu.org>
Subject: Re: Fwd: kernel: MCA: CPU 0 COR (1) internal parity error
Message-ID: <20150419205217.GA3802@alchemy.franken.de>
References: <20150118060843.GA1184@c720-r276659>
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On Sun, Jan 18, 2015 at 07:08:43AM +0100, Matthias Apitz wrote:
> 
> Hello,
> 
> I'm running since some days a recent -HEAD r276659 on an Acer C720 Chromebook
> which works very nicely and fast (I really have never seen such a fast KDE4 desktop).
> 
> >From time to time (let's say 2-3 times a day) I see messages like this
> in /var/log/messages:
> 
> Jan 16 12:04:24 c720-r276659 kernel: MCA: Bank 0, Status 0x90000040000f0005
> Jan 16 12:04:24 c720-r276659 kernel: MCA: Global Cap 0x0000000000000c07, Status 0x0000000000000000
> Jan 16 12:04:24 c720-r276659 kernel: MCA: Vendor "GenuineIntel", ID 0x40651, APIC ID 0
> Jan 16 12:04:24 c720-r276659 kernel: MCA: CPU 0 COR (1) internal parity error
> 

<...>

> CPU: Intel(R) Celeron(R) 2955U @ 1.40GHz (1396.80-MHz 686-class CPU)
>   Origin="GenuineIntel"  Id=0x40651  Family=0x6  Model=0x45  Stepping=1

Apparently, this is the HSD131 or - more precisely - the HSM142 silicon
bug, although the specification update concerened with HSM142 [1] only
enlists CPU IDs 0x3c and 0x46 (actually, it only has identification
information for the M- and H-line of processors, but not the Y- and -
which Celeron 2955U belongs into - U-lines). Reporting should be gone
with r281751.

Marius

1: http://www.intel.com/content/dam/www/public/us/en/documents/specification-updates/4th-gen-core-family-mobile-specification-update.pdf