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

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Message-ID: <20071016180037.GC5670@shadowen.org>
Date:	Tue, 16 Oct 2007 19:00:37 +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>,
	Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>,
	Dhaval Giani <dhaval@...ux.vnet.ibm.com>
Subject: Re: [BUG] 2.6.23-git8 kernel oops at __rb_rotate_left+0x7/0x70

On Tue, Oct 16, 2007 at 11:46:31AM +0200, Ingo Molnar wrote:
> 
> * Ingo Molnar <mingo@...e.hu> 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.
> 
> 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.

Ok, preliminary results with this disabled seem to get us past
kernbench.  I am rerunning with it enabled to confirm it blammo's.

-apw
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