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

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Message-ID: <3120802.QvTiDSHyPj@vostro.rjw.lan>
Date:	Wed, 30 Jan 2013 23:45:27 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Jiri Slaby <jslaby@...e.cz>
Cc:	Borislav Petkov <bp@...en8.de>,
	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 Wednesday, January 30, 2013 11:17:06 PM Jiri Slaby wrote:
> On 01/30/2013 10:39 PM, Rafael J. Wysocki wrote:
> >> What is cool is that I have steps to reproduce:
> >> 1) boot
> >> 2) run the attached script (turn on all possible power savings -- in
> >> fact everything what powertop suggests)
> >> 3) suspend to _disk_ (mem is not enough, BIOS apparently has to
> >> interfere here)
> > 
> > No, I don't think it's the BIOS.  Most likely the boot kernel.
> 
> Or that...
> 
> >> 4) resume from disk
> >> 5) boom
> >>
> >> I tried to remove also wireless drivers, no change.
> > 
> > Is the resume boot kernel the same as the one in the image?
> 
> Yeah, the same ones: 3.7.5

Well, I guess that we leak some state from the boot kernel to the image kernel.
I have no idea what it is, but I suspect something arch-specific.

I wonder what the affected systems have in common apart from e1000e?

Rafael


-- 
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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