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

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Message-ID: <20071016184204.GA19219@linux.vnet.ibm.com>
Date:	Wed, 17 Oct 2007 00:12:04 +0530
From:	Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>
To:	Andy Whitcroft <apw@...dowen.org>
Cc:	Ingo Molnar <mingo@...e.hu>,
	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>,
	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:
> > 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.

Andy,
	I have got details from Kamalesh on the machine where this is 
recreatable (we couldn't recreate on other machines). Will start looking
at this tomorrow morning first thing ..

-- 
Regards,
vatsa
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