linux-kernel - Re: 2.6.24-rc1-gb4f5550 oops

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Message-ID: <20071108221951.71224bd8@worthy.swandive.local>
Date:	Thu, 8 Nov 2007 22:19:51 +0000
From:	Grant Wilson <grant.wilson@....co.uk>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	lkml <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	netdev <netdev@...r.kernel.org>
Subject: Re: 2.6.24-rc1-gb4f5550 oops

On Thu, 8 Nov 2007 22:42:21 +0100
"Rafael J. Wysocki" <rjw@...k.pl> wrote:

> On Thursday, 8 of November 2007, Grant Wilson wrote:
> > On Thu, 8 Nov 2007 16:53:10 +0100
> > "Rafael J. Wysocki" <rjw@...k.pl> wrote:
> > 
> > > On Thursday, 8 of November 2007, Grant Wilson wrote:
> > > > On Thu, 8 Nov 2007 01:06:21 +0100
> > > > "Rafael J. Wysocki" <rjw@...k.pl> wrote:
> > > > 
> > > > > On Monday, 5 of November 2007, Grant Wilson wrote:
> > > > > > Hi,
> > > > > > I got this oops on 2.6.24-rc1-641-gb4f5550:
> > > > > 
> > > > > (1) Is this reproducible?
> > > > > (2) Did it happen previously on your system?
> > > > >
> > > > > [18073.371126] Unable to handle kernel NULL pointer dereference at 0000000000000120 RIP: 
> > > > > [18073.371134]  [<ffffffff8023572e>] check_preempt_wakeup+0x6e/0x110
> > > > 
> > > > This has now happened twice - the second time was last night when
> > > > running 2.6.24-rc2.
> > > > 
> > > > Here's that second occurrence:
> > > > 
> > [snip]
> > > 
> > > Hmm.
> > > 
> > > Please run "gdb vmlinux" and see what code corresponds to
> > > check_preempt_wakeup+0x6e in your kernel.
> >
> > 
> > Dump of assembler code for function check_preempt_wakeup:
> 
> Well, thanks, but I meant the source code.  Please do "gdb vmlinux" and then
> "l *check_preempt_wakeup+0x6e" in gdb.

Here's the requested output:

(gdb) l *check_preempt_wakeup+0x6e
0xffffffff802329ae is in check_preempt_wakeup (kernel/sched_fair.c:668).
663
664     /* Do the two (enqueued) entities belong to the same group ? */
665     static inline int
666     is_same_group(struct sched_entity *se, struct sched_entity *pse)
667     {
668             if (se->cfs_rq == pse->cfs_rq)
669                     return 1;
670
671             return 0;
672     }

Grant
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