linux-kernel - Re: WARN_ON at line 380 in kernel/smp.c under 2.6.32.2 + TuxOnIce + KDB

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Message-ID: <1261510020.4937.73.camel@laptop>
Date:	Tue, 22 Dec 2009 20:27:00 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Pedro Ribeiro <pedrib@...il.com>
Cc:	linux-kernel@...r.kernel.org, Nigel Cunningham <nigel@...onice.net>
Subject: Re: WARN_ON at line 380 in kernel/smp.c under 2.6.32.2 + TuxOnIce
 + KDB

On Tue, 2009-12-22 at 19:16 +0000, Pedro Ribeiro wrote:
> On Tue, Dec 22, 2009 at 5:20 PM, Peter Zijlstra <peterz@...radead.org> wrote:

> > If you'd enable frame pointers the strack traces would be clearer, but
> > it looks like a bug in tux on ice, doing kmap_high() with IRQs disabled
> > or something like that.

> I enabled frame pointers, is this more useful?
> http://img684.imageshack.us/img684/5118/dsc01206m.jpg
> http://img96.imageshack.us/img96/5493/dsc01207k.jpg
> http://img33.imageshack.us/img33/7470/dsc01208lp.jpg

Those read more clearly indeed, thanks!

It really looks like what I said above, in that tux on ice is calling
kmap() from an inappropriate context.

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