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

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Date:	Thu, 4 Apr 2013 11:33:02 +0200
From:	Borislav Petkov <bp@...en8.de>
To:	Jiri Slaby <jslaby@...e.cz>
Cc:	"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 Thu, Apr 04, 2013 at 09:32:09AM +0200, Jiri Slaby wrote:
> And yesterday I plugged in an ethernet cable for a wihle and guess
> what happened today: Uhhuh. NMI received for unknown reason 2c on CPU
> 0.
>
> Still holds that this is the first time since Jan.

Yeah, you could try my sure-fire way to trigger it:

* boot the box without any "nmi_watchdog" tweaks on the kernel cmdline -
i.e. it should be enabled.

* turn off NMI watchdog through powertop or directly through
/proc/sys/kernel/nmi_watchdog

* suspend to disk

Now when you resume, you should either see unknown reason 2c or 3c.

-- 
Regards/Gruss,
    Boris.

Sent from a fat crate under my desk. Formatting is fine.
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