linux-kernel - Re: [BUG] set_mempolicy(MPOL_INTERLEAV) cause kernel panic

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Message-Id: <20090728101157.9465b2e5.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Tue, 28 Jul 2009 10:11:57 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	David Rientjes <rientjes@...gle.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Lee Schermerhorn <lee.schermerhorn@...com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	miaox@...fujitsu.com, Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Paul Menage <menage@...gle.com>,
	Nick Piggin <nickpiggin@...oo.com.au>, y-goto@...fujitsu.com,
	Pekka Enberg <penberg@...helsinki.fi>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [BUG] set_mempolicy(MPOL_INTERLEAV) cause kernel panic

On Mon, 27 Jul 2009 18:02:50 -0700 (PDT)
David Rientjes <rientjes@...gle.com> wrote:

> On Tue, 28 Jul 2009, KAMEZAWA Hiroyuki wrote:
> 
> > > The problem originally reported here doesn't appear to have anything to do 
> > > with hotplug, it looks like it is the result of Lee's observation that 
> > > ia64 defaults top_cpuset's mems to N_POSSIBLE, which _should_ have been 
> > > updated by cpuset_init_smp(). 
> > cpuset_init_smp() just updates cpuset's mask.
> > init's task->mems_allowed is intizialized independently from cpuset's mask.
> > 
> 
> Presumably the bug is that N_HIGH_MEMORY is not a subset of N_ONLINE at 
> this point on ia64.
> 
N_HIGH_MEMORY is must be subset of N_ONLINE, at the any moment. Hmm,
I'll look into what happens in ia64 world.

> > Could you teach me a pointer for Lee's observation ?
> > 
> 
> http://marc.info/?l=linux-kernel&m=124767909310293
> 
Aha, my patch is very similar to Lee's one.
And he said "hotplug is issue", yes. it is.


Thanks,
-Kame

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