linux-kernel - Re: [PATCH 0/63] Basic scheduler support for automatic NUMA balancing V9

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Date:	Wed, 9 Oct 2013 19:15:37 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Mel Gorman <mgorman@...e.de>, Rik van Riel <riel@...hat.com>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Linux-MM <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 0/63] Basic scheduler support for automatic NUMA
 balancing V9


* Peter Zijlstra <peterz@...radead.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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