linux-kernel - Re: [PATCH 0/9] V2: idle page tracking / working set estimation

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Date:	Mon, 3 Oct 2011 11:06:20 -0400
From:	Eric B Munson <emunson@...bm.net>
To:	Michel Lespinasse <walken@...gle.com>
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Dave Hansen <dave@...ux.vnet.ibm.com>,
	Rik van Riel <riel@...hat.com>,
	Balbir Singh <bsingharora@...il.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Johannes Weiner <jweiner@...hat.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Hugh Dickins <hughd@...gle.com>,
	Michael Wolf <mjwolf@...ibm.com>
Subject: Re: [PATCH 0/9] V2: idle page tracking / working set estimation

On Fri, 30 Sep 2011, Michel Lespinasse wrote:

> On Fri, Sep 30, 2011 at 11:19 AM, Eric B Munson <emunson@...bm.net> wrote:
> > I am able to recreate on a second desktop I have here (same model CPU but a
> > different MB so I am fairly sure it isn't dying hardware).  It looks to me like
> > a CPU softlocks and it stalls the process active there, so most recently that
> > was XOrg.  The machine lets me login via ssh for a few minutes, but things like
> > ps and cat or /proc files will start to work and give some output but hang.
> > I cannot call reboot, nor can I sync the fs and reboot via SysRq.  My next step
> > is to setup a netconsole to see if anything comes out in the syslog that I
> > cannot see.
> 
> I haven't had time to try & reproduce locally yet (apologies - things
> have been coming up at me).
> 
> But a prime suspect would be a bad interaction with
> CONFIG_MEMORY_HOTPLUG, as Kamezama remarked in his reply to patch 4. I
> think this could be the most likely cause of what you're observing.
> 

CONFIG_MEMORY_HOTPLUG seems to be the responsible party here, I disabled it in
my config and have been able to build 6 kernels straight without a hang.

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