linux-kernel - Re: Commit cb83b62 fails to boot with a divide by zero error.

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Message-ID: <20120511155549.GI3751@sgi.com>
Date:	Fri, 11 May 2012 10:55:49 -0500
From:	Robin Holt <holt@....com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	Robin Holt <holt@....com>, Ingo Molnar <mingo@...nel.org>,
	linux-kernel@...r.kernel.org
Subject: Re: Commit cb83b62 fails to boot with a divide by zero error.

On Fri, May 11, 2012 at 05:36:13PM +0200, Peter Zijlstra wrote:
> On Fri, 2012-05-11 at 10:05 -0500, Robin Holt wrote:
> > On Fri, May 11, 2012 at 04:33:10PM +0200, Peter Zijlstra wrote:
> > > On Fri, 2012-05-11 at 08:39 -0500, Robin Holt wrote:
> > > 
> > > > We found that reverting the commit:
> > > > cb83b62 (x86/sched/core) sched/numa: Rewrite the CONFIG_NUMA sched domain support
> > > > 
> > > > also got things working.
> > > 
> > > there's a particularly stupid bug in that code
> > 
> > Even with that applied, I still get the divide by zero.
> 
> Humm.. what kind of machine is this? And how far along does it get in
> booting? ->power isn't supposed to get to 0.

It is a four blade (8 socket 80 core 160 hyper-thread machine) with 40
GB of RAM.

Looking at the earlier kernel messages, I am wondering if I don't have a
BIOS that is giving me crud.  I have messages about hyperthreads being
on different nodes.  That had not been happening in the past.  I don't
have access to the machine now, but the BIOS string that had printed
out is from a developer's debug version.

When I get access to the machine again (likely not until Monday), I
will flash a release BIOS and retest.  Until then, please feel free to
ignore me.

Thanks,
Robin
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