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

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Message-ID: <alpine.DEB.2.00.0907271758170.29815@chino.kir.corp.google.com>
Date:	Mon, 27 Jul 2009 18:02:50 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.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 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.

> Could you teach me a pointer for Lee's observation ?
> 

http://marc.info/?l=linux-kernel&m=124767909310293
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