linux-kernel - Re: 2.6.38-rc2: Uhhuh. NMI received for unknown reason 2d on CPU 0.

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Date:	Wed, 16 Feb 2011 07:19:00 +0300
From:	Cyrill Gorcunov <gorcunov@...il.com>
To:	Dave Airlie <airlied@...il.com>
Cc:	George Spelvin <linux@...izon.com>, a.p.zijlstra@...llo.nl,
	dzickus@...hat.com, eranian@...gle.com,
	linux-kernel@...r.kernel.org, ming.m.lin@...el.com, mingo@...e.hu
Subject: Re: 2.6.38-rc2: Uhhuh. NMI received for unknown reason 2d on CPU 0.

On 2/16/11, Dave Airlie <airlied@...il.com> wrote:
> On Wed, Feb 2, 2011 at 2:18 PM, Cyrill Gorcunov <gorcunov@...il.com> wrote:
>> On 2/2/11, George Spelvin <linux@...izon.com> wrote:
>>>>  But if you have a will or would like to help debug the problem -- mind
>>>> to
>>>> try the patch below? Note the patch is ugly at moment and must *not* be
>>>> running on non-P4 system (and I only compile-tested it so no guarantees
>>>> at all, and I've CC'ed a couple of people as well)
>>>
>>> Promising...  After 32 minute of uptime, no NMI complaints so far.
>>>
>>> I'll let it run overnight and see what happens.
>>>
>>
>> Great, thanks. Though the patch didn't help for Don, ie there is still
>> an issue which needs to be resolved as well.
>> --
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>>
>
> Ping on this problem, still seeing
>
> Uhhuh. NMI received for unknown reason 3c on CPU 0.
> Do you have a strange power saving mode enabled?
> Dazed and confused, but trying to continue
>
> on my Pentium-D system here with latest Linus head.
>
> its sometimes 3c, sometimes 3d, I'm going to bisect and push for
> reverts if nobody still has any clue about how to fix this.
>
> Dave.
>

We still trying to resolve it but without success yet. There is no
easy way to revert it. One of the option might be to disable perf on
p4 for a while. If this is acceptable -- i'll cook such patch and send
it to Ingo. Hm?
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