linux-kernel - RE: Warning in during hotplug on 2.6.27-rc2-git5

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Message-ID: <6453C3CB8E2B3646B0D020C112613273C5AC71@sausexmb4.amd.com>
Date:	Thu, 14 Aug 2008 13:35:49 -0500
From:	"Langsdorf, Mark" <mark.langsdorf@....com>
To:	"Andi Kleen" <andi@...stfloor.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>
CC:	<linux-kernel@...r.kernel.org>, "Greg KH" <greg@...ah.com>,
	"Ingo Molnar" <mingo@...e.hu>,
	"Andrew Morton" <akpm@...ux-foundation.org>
Subject: RE: Warning in during hotplug on 2.6.27-rc2-git5

> 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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