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

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Date:	Tue, 01 Mar 2011 17:03:08 +0200
From:	denys@...p.net.lb
To:	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: NMI received for unknown reason, 2.6.38-rc6
 regression?

 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.

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