linux-kernel - Re: 2.6.30-rc1 - nmi

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Message-ID: <20090414084232.GG27003@elte.hu>
Date:	Tue, 14 Apr 2009 10:42:32 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Ed Tomlinson <edt@....ca>, Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: 2.6.30-rc1 - nmi_watchdog broken?


* Ed Tomlinson <edt@....ca> wrote:

> Hi,
> 
> I've been having fun finding bugs in 30-rc1.  One of them is a 
> hard freeze.  I've not seen this type of problem on this hardware 
> before 30-rc1 - so I doubt if its hardware.  The best way I know 
> to debug a hard hang is with the nmi_watchdog.  I just cannot get 
> it to work.

[ Btw., have you tried CONFIG_PROVE_LOCKING=y - does it produce
  anything before or at the hard lockup point? ]

> The system is a 3 core amd cpu on a 790gx chipset.
> 
> If I boot the nmi_watchdog=1 it complains that lapci is not 
> available and the boot stops.  Same problem if I change the 
> clocksource to tsc, If I disable highres timers it panics.  If I 
> use nmi_watchdog=2 it panics. Am I doing something wrong or have I 
> hit a bug?
> 
> Logs of boots with and without highres timers inlined below.

hm, nmi_watchdog=1 acting funny is not unheard of. But 
nmi_watchdog=2 should really work. How does it panic, do
you have a capture of that?

	Ingo
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