Re: [BUG] 2.6.23-git8 kernel oops at __rb_rotate_left+0x7/0x70

Andy Whitcroft
2007-10-16T18:02:01Z

On Tue, Oct 16, 2007 at 11:46:31AM +0200, Ingo Molnar wrote:
>
> * Ingo Molnar <mingo@elte.hu> wrote:
>
> >
> > * Kamalesh Babulal <kamalesh@linux.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.

-apw