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

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Message-ID: <510A27C8.3070909@suse.cz>
Date:	Thu, 31 Jan 2013 09:14:00 +0100
From:	Jiri Slaby <jslaby@...e.cz>
To:	Borislav Petkov <bp@...en8.de>, "Rafael J. Wysocki" <rjw@...k.pl>,
	Bjorn Helgaas <bhelgaas@...gle.com>, x86@...nel.org,
	lkml <linux-kernel@...r.kernel.org>,
	Konstantin Khlebnikov <khlebnikov@...nvz.org>
Subject: Re: Uhhuh. NMI received for unknown reason 2c on CPU 0.

On 01/31/2013 08:09 AM, Borislav Petkov wrote:
> On Thu, Jan 31, 2013 at 01:54:56AM +0100, Rafael J. Wysocki wrote:
>> On Thursday, January 31, 2013 12:47:40 AM Jiri Slaby wrote:
>>> On 01/31/2013 12:12 AM, Jiri Slaby wrote:
>>>> I think I will start with commenting parts of `power' script to see
>>>> exactly which of the power savings cause this.
>>>
>>> ... NMI watchdog. If I remove it from the script, the problem
>>> disappears. If I try it alone, I have those NMIs.
>>
>> Well, beats me. :-(
>>
>> I suspect that it doesn't quiesce itself sufficiently before image restoration
>> and we get some crosstalk between the boot kernel and the image kernel.
> 
> Well, I did what Jiri said causes it:
> 
> echo 0 > /proc/sys/kernel/nmi_watchdog
> 
> No NMI.
> 
> BUT(!), if I start powertop and set all tunables in the "Tunables" tab
> to "Good", then suspend to disk, when I resume I get the NMI and this
> time the unknown reason is 0x3c. Sounds like this needs bisection...
> Btw, this is latest -rc5 + tip/master and Jiri triggers it on 3.7-stable
> ...

And 3.6(.0) was the first one I _tried_ and had that issue too. Not sure
if there is any bisect-good kernel to start with.

> Btw, this e1000e thing has another problem: when I unplug the network
> cable and replug it again, it cannot ping local network anymore.
> Normally, when you plug the network cable back in, it does some sort if
> link detection saying eth link is back up but it doesn't say it on that
> box - only a reboot fixes it. Hmm.

I think this is what Konstantin fixes with his patches.

-- 
js
suse labs
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