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Subject: RE: Warning in during hotplug on 2.6.27-rc2-git5
Date: Thu, 14 Aug 2008 13:35:49 -0500
Message-ID: <6453C3CB8E2B3646B0D020C112613273C5AC71@sausexmb4.amd.com>
In-Reply-To: <20080814163450.GA13814@one.firstfloor.org>
Thread-Topic: Warning in during hotplug on 2.6.27-rc2-git5
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References: <200808141753.58547.rjw@sisk.pl> <20080814163450.GA13814@one.firstfloor.org>
From: "Langsdorf, Mark" <mark.langsdorf@amd.com>
To: "Andi Kleen" <andi@firstfloor.org>, "Rafael J. Wysocki" <rjw@sisk.pl>
CC: <linux-kernel@vger.kernel.org>, "Greg KH" <greg@kroah.com>,
       "Ingo Molnar" <mingo@elte.hu>,
       "Andrew Morton" <akpm@linux-foundation.org>
Sender: linux-kernel-owner@vger.kernel.org
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Lines: 34

> On Thu, Aug 14, 2008 at 05:53:57PM +0200, Rafael J. Wysocki wrote:
> > On Wednesday, 13 of August 2008, Mark Langsdorf wrote:
> > > I'm seeing the following error message when I hotunplug and replug
> > > a cpu in 2.6.27-rc2-git5.  The system becomes unstable almost
> > > immediately afterwards.
> > 
> > Hm, it seems that MCE is involved somehow.  Andi, can you 
> have a look at this,
> > please?
> 
> FWIW the mce code here actually hasn't changed for a long time.
> 
> 
> > > ------------[ cut here ]------------
> > > WARNING: at fs/sysfs/dir.c:463 sysfs_add_one+0x33/0x39()
> > > sysfs: duplicate filename 'machinecheck4' can not be created
> 
> The only way I could see that happening if CPU_DEAD/CPU_ONLINE
> is not properly balanced.

I'm still seeing it on 2.6.27-rc2, even with the 
patch here http://lkml.org/lkml/2008/7/30/171 and the
wbinvd_halt code patch applied.  Maybe something else
broke in some of the recent hotplug changes?

-Mark Langsdorf
Operating System Research Center
AMD

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