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

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Message-ID: <9f4d7fae5845b91debc86a65d51bf96a@visp.net.lb>
Date:	Tue, 01 Mar 2011 18:42:46 +0200
From:	denys@...p.net.lb
To:	Cyrill Gorcunov <gorcunov@...il.com>
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 Tue, 01 Mar 2011 19:08:43 +0300, Cyrill Gorcunov wrote:
> 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!
 I test it, and it seems helps. At least on one host, and yes, seems all 
 of them P4.


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