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Date: Tue, 16 Oct 2007 11:46:31 +0200
From: Ingo Molnar <mingo@elte.hu>
To: Kamalesh Babulal <kamalesh@linux.vnet.ibm.com>
Cc: LKML <linux-kernel@vger.kernel.org>, torvalds@linux-foundation.org,
       Andrew Morton <akpm@linux-foundation.org>,
       Andy Whitcroft <apw@shadowen.org>,
       Dmitry Adamushko <dmitry.adamushko@gmail.com>,
       Peter Zijlstra <a.p.zijlstra@chello.nl>,
       Srivatsa Vaddagiri <vatsa@linux.vnet.ibm.com>,
       Dhaval Giani <dhaval@linux.vnet.ibm.com>
Subject: Re: [BUG] 2.6.23-git8 kernel oops at __rb_rotate_left+0x7/0x70
Message-ID: <20071016094631.GA10649@elte.hu>
References: <47144B4F.3050108@linux.vnet.ibm.com> <20071016091012.GB24341@elte.hu>
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* Ingo Molnar <mingo@elte.hu> wrote:

> 
> * Kamalesh Babulal <kamalesh@linux.vnet.ibm.com> wrote:
> 
> > While running kernbench with the 2.6.23-git8 following oops is 
> > produced
> > 
> > Unable to handle kernel NULL pointer dereference at 0000000000000010 RIP: 
> >  [<ffffffff8033f347>] __rb_rotate_left+0x7/0x70
> 
> that looks nasty ...
> 
> and -git8 should have the v2.6.23 scheduler code in essence.

ah, this is likely with the recent scheduler commits included as well, 
right?

if it's reproducable, could you try with group scheduling disabled, i.e. 
with:

  # CONFIG_FAIR_GROUP_SCHED is not set

as that would be the main suspect for such type of a crash.

	Ingo
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