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    SubjectRe: Warning in during hotplug on 2.6.27-rc2-git5
    On Sat, Aug 16, 2008 at 09:28:24PM +0200, Rafael J. Wysocki wrote:
    > On Thursday, 14 of August 2008, Langsdorf, Mark wrote:
    > > > 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?
    >
    > My guess is that MCE does somthing that is not allowed by sysfs any more.

    Hm, sysfs hasn't changed any in 2.6.27-rcX that I know of.

    thanks,

    greg k-h


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