linux-kernel - Re: NMI received for unknown reason, 2.6.38-rc6 regression?

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Message-ID: <4D6D1A0B.3050903@gmail.com>
Date:	Tue, 01 Mar 2011 19:08:43 +0300
From:	Cyrill Gorcunov <gorcunov@...il.com>
To:	denys@...p.net.lb
CC:	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
	linux-kernel@...r.kernel.org
Subject: Re: NMI received for unknown reason, 2.6.38-rc6 regression?

On 03/01/2011 06:03 PM, denys@...p.net.lb wrote:
> I upgrade around 140 hosts (from 2.6.33 till 2.6.37), and got on many of them error/warining, flooding kernel log. Here is short snapshot:
>
> [ 1882.057474] Uhhuh. NMI received for unknown reason 3c on CPU 0.
> [ 1882.057576] Do you have a strange power saving mode enabled?
> [ 1882.057672] Dazed and confused, but trying to continue
> [ 2421.419732] Uhhuh. NMI received for unknown reason 3c on CPU 0.
> [ 2421.419835] Do you have a strange power saving mode enabled?
> [ 2421.419930] Dazed and confused, but trying to continue
> [ 2636.016831] Uhhuh. NMI received for unknown reason 2c on CPU 1.
> [ 2636.016934] Do you have a strange power saving mode enabled?
> [ 2636.017003] Dazed and confused, but trying to continue
>
> Full dmesg from 2 machines:
> http://www.nuclearcat.com/dmesg1.txt
> http://www.nuclearcat.com/dmesg2.txt
> I can provide more, if required.
>
> It seems nmi_watchdog is enabled by default, and it is causing issue. I am checking now with nmi_watchdog=0, but i need more time to confirm that.
> Also i am experiencing some problem with ppp users(all of them is pppoe servers), but i am not sure it is related to that, so maybe this NMI warning is just cosmetic regression.
>
> All systems is x86, same kernel config.
> If you need more information - let me know.
>

nmi_watchdog=0 should help here, actually a nit was fixed by https://patchwork.kernel.org/patch/566611/
which is not in 2.6.38-rc6 but I rather suspect it'll be in -rc7 or final .38. If you have an ability
to pickup it and test -- this would be great!

-- 
     Cyrill
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