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

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Date:	Thu, 14 Aug 2008 18:34:50 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Mark Langsdorf <mark.langsdorf@....com>,
	Andi Kleen <andi@...stfloor.org>, 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.

-Andi
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