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

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Message-ID: <20071017090753.GH2657@shadowen.org>
Date:	Wed, 17 Oct 2007 10:07:53 +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 07:00:37PM +0100, Andy Whitcroft wrote:
> 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.

A rerun with it enabled however ran to completion.  So I think we have
to assume this is at best not 100% reproducible.  Seems that more
directed testing is going on now.

-apw
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