linux-kernel - Re: [BUG] 2.6.23-git8 kernel oops at __rb_rotate

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Message-ID: <20071016100311.GD17517@shadowen.org>
Date:	Tue, 16 Oct 2007 11:03:11 +0100
From:	Andy Whitcroft <apw@...dowen.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Kamalesh Babulal <kamalesh@...ux.vnet.ibm.com>,
	LKML <linux-kernel@...r.kernel.org>,
	torvalds@...ux-foundation.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Dmitry Adamushko <dmitry.adamushko@...il.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [BUG] 2.6.23-git8 kernel oops at __rb_rotate_left+0x7/0x70

On Tue, Oct 16, 2007 at 11:10:12AM +0200, Ingo Molnar wrote:
> 
> * Kamalesh Babulal <kamalesh@...ux.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.

To fill in a few details.  This was triggered in the middle of a
kernbench run on the machine.  A job with just dbench runs in it ran to
completion.  The machine is a 4 node numa x86_64 system.

Seems that most schedular options are on:

CONFIG_FAIR_GROUP_SCHED=y
CONFIG_FAIR_USER_SCHED=y

At the moment we don't have any historical jobs back from 2.6.23 so I
cannot be more specific as to when it arrived in mainline.  The x86/x86_64
merge broke our build process; a bad assumption here, not a problem with
the merge.

-apw
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