linux-kernel - Re: kernel NULL pointer dereference in check

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Date:	Tue, 16 Oct 2007 09:38:37 +0200
From:	Mike Galbraith <efault@....de>
To:	Jan Blunck <jblunck@...e.de>
Cc:	mingo@...hat.com,
	Linux-Kernel Mailinglist <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...l.org>
Subject: Re: kernel NULL pointer dereference in check_spread+0x0/0x26

On Fri, 2007-10-12 at 14:40 +0200, Jan Blunck wrote:
> This is with 2.6.23-mm1 and allmodconfig.
> 
> Seems that se in the following is a NULL pointer.
> 
> 453     static void check_spread(struct cfs_rq *cfs_rq, struct
> sched_entity *se)
> 454     {
> 455     #ifdef CONFIG_SCHED_DEBUG
> 456             s64 d = se->vruntime - cfs_rq->min_vruntime;
> 457
> 458             if (d < 0)
> 459                     d = -d;

Have you hit this again recently?  You and I seem to be the only ones
who have hit it, and here, it either went away, or went into hiding.
I've been trying to tickle this (highly improbable) oops with fork/exit
bombs while other things are running (scribble scribble), and failing to
provoke any adverse reaction.

	-Mike

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