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Date: Fri, 30 Sep 2011 17:40:33 -0400
From: Eric B Munson <emunson@mgebm.net>
Subject: Re: [PATCH 0/9] V2: idle page tracking / working set estimation
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To: Michel Lespinasse <walken@google.com>
Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, Andrew Morton <akpm@linux-foundation.org>, KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>, Dave Hansen <dave@linux.vnet.ibm.com>, Rik van Riel <riel@redhat.com>, Balbir Singh <bsingharora@gmail.com>, Peter Zijlstra <a.p.zijlstra@chello.nl>, Andrea Arcangeli <aarcange@redhat.com>, Johannes Weiner <jweiner@redhat.com>, KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>, Hugh Dickins <hughd@google.com>, Michael Wolf <mjwolf@us.ibm.com>

 On Fri, 30 Sep 2011 14:16:25 -0700, Michel Lespinasse wrote:
> On Fri, Sep 30, 2011 at 11:19 AM, Eric B Munson <emunson@mgebm.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). A It looks 
>> to me like
>> a CPU softlocks and it stalls the process active there, so most 
>> recently that
>> was XOrg. A 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. 
>> A 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.

 I will try disabling Memory Hotplug on Monday and let you know if that 
 helps.

 Eric

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