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SubjectRe: [PATCH 0/63] Basic scheduler support for automatic NUMA balancing V9

* Peter Zijlstra <peterz@infradead.org> wrote:

> On Wed, Oct 09, 2013 at 06:28:01PM +0200, Ingo Molnar wrote:
> >
> > Hm, so I'm seeing boot crashes with the config attached:
> >
> > INIT: version 2.86 booting
> > BUG: unable to handle kernel BUG: unable to handle kernel paging
> > requestpaging request at eaf10f40
> > at eaf10f40
> > IP:IP: [<b103e0ef>] task_work_run+0x52/0x87
> > [<b103e0ef>] task_work_run+0x52/0x87
> > *pde = 3fbf9067 *pde = 3fbf9067 *pte = 3af10060 *pte = 3af10060
> >
> > Oops: 0000 [#1] Oops: 0000 [#1] DEBUG_PAGEALLOCDEBUG_PAGEALLOC
> >
> > CPU: 0 PID: 171 Comm: hostname Tainted: G W
> > 3.12.0-rc4-01668-gfd71a04-dirty #229484
> > CPU: 0 PID: 171 Comm: hostname Tainted: G W
> > 3.12.0-rc4-01668-gfd71a04-dirty #229484
> > task: eaf157a0 ti: eacf2000 task.ti: eacf2000
> >
> > Note that the config does not have NUMA_BALANCING enabled. With another
> > config I also had a failed bootup due to the OOM killer kicking in. That
> > didn't have NUMA_BALANCING enabled either.
> >
> > Yet this all started today, after merging the NUMA patches.
> >
> > Any ideas?
>
> > CONFIG_MGEODE_LX=y
>
> It looks like -march=geode generates similar borkage to the
> -march=winchip2 like we found earlier today.
>
> Must be randconfig luck to only hit it now.

Yes, very weird but such is life :-)

Also note that this reproduces with GCC 4.7 ...

Thanks,

Ingo


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