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

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Message-ID: <5170962.qHnbnlVDfx@vostro.rjw.lan>
Date:	Thu, 31 Jan 2013 01:54:56 +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 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.

Thanks,
Rafael


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