linux-kernel - Re: [PATCH 3/3] ie31200

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Message-ID: <5345A54D.2050808@akamai.com>
Date:	Wed, 09 Apr 2014 15:53:49 -0400
From:	Jason Baron <jbaron@...mai.com>
To:	Borislav Petkov <bp@...en8.de>
CC:	"Luck, Tony" <tony.luck@...el.com>,
	Aristeu Rozanski <aris@...hat.com>,
	"hpa@...or.com" <hpa@...or.com>,
	"mingo@...nel.org" <mingo@...nel.org>,
	"dougthompson@...ssion.com" <dougthompson@...ssion.com>,
	"m.chehab@...sung.com" <m.chehab@...sung.com>,
	"mitake@....info.waseda.ac.jp" <mitake@....info.waseda.ac.jp>,
	"linux-edac@...r.kernel.org" <linux-edac@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/3] ie31200_edac: Add driver

On 04/09/2014 03:14 PM, Borislav Petkov wrote:
> On Wed, Apr 09, 2014 at 02:57:19PM -0400, Jason Baron wrote:
>> Right, so maybe the fact that its a desktop chipset means that it
>> behaves differently and doesn't raise MCEs on memory errors. We have a
>> bunch of these processors and we haven't yet seen an MCE raised on a
>> memory error.
> 
> This can't be - an uncorrectable error will have to generate a machine
> check exception if consumed - there's no other option.
> 
> Can you do
> 
> rdmsr 0x179
> rdmsr 0x17b
> 
> and paste the results here?
>

Unfortunately, the box reporting the ue errors just went into transit (so
that I can better examine this issue), so I will probably not be able to
run this experiment on that specific box until next week.

However, I was able to run it on a very similar box (same pci id for the
mch), and I get:
 
# ./rdmsr 0x179
c09

# ./rdmsr 0x17b
rdmsr: CPU 0 cannot read MSR 0x0000017b

Thanks,

-Jason
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