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Date: Mon, 3 Oct 2011 11:06:20 -0400
From: Eric B Munson <emunson@mgebm.net>
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>,
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        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>
Subject: Re: [PATCH 0/9] V2: idle page tracking / working set estimation
Message-ID: <20111003150619.GA12778@mgebm.net>
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On Fri, 30 Sep 2011, 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 b=
ut a
> > different MB so I am fairly sure it isn't dying hardware). =A0It looks =
to me like
> > a CPU softlocks and it stalls the process active there, so most recentl=
y that
> > was XOrg. =A0The machine lets me login via ssh for a few minutes, but t=
hings like
> > ps and cat or /proc files will start to work and give some output but h=
ang.
> > I cannot call reboot, nor can I sync the fs and reboot via SysRq. =A0My=
 next step
> > is to setup a netconsole to see if anything comes out in the syslog tha=
t I
> > cannot see.
>=20
> I haven't had time to try & reproduce locally yet (apologies - things
> have been coming up at me).
>=20
> 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.
>=20

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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