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

[Andi Kleen]

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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