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

[Andy Whitcroft]

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