Re: 2.6.24-rc1-gb4f5550 oops

Grant Wilson
2007-11-08T22:20:16Z

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

> On Thursday, 8 of November 2007, Grant Wilson wrote:
> > On Thu, 8 Nov 2007 16:53:10 +0100
> > "Rafael J. Wysocki" <rjw@sisk.pl> wrote:
> >
> > > On Thursday, 8 of November 2007, Grant Wilson wrote:
> > > > On Thu, 8 Nov 2007 01:06:21 +0100
> > > > "Rafael J. Wysocki" <rjw@sisk.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