From: "Rafael J. Wysocki" <rjw@sisk.pl>
To: "Langsdorf, Mark" <mark.langsdorf@amd.com>
Subject: Re: Warning in during hotplug on 2.6.27-rc2-git5
Date: Mon, 18 Aug 2008 18:42:24 +0200
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Cc: "Andi Kleen" <andi@firstfloor.org>, linux-kernel@vger.kernel.org,
       "Greg KH" <greg@kroah.com>, "Ingo Molnar" <mingo@elte.hu>,
       "Andrew Morton" <akpm@linux-foundation.org>
References: <200808141753.58547.rjw@sisk.pl> <200808181638.37707.rjw@sisk.pl> <6453C3CB8E2B3646B0D020C112613273C5AC7D@sausexmb4.amd.com>
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On Monday, 18 of August 2008, Langsdorf, Mark wrote:
> > > > > 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?
> >
> > I have a couple of questions, then:
> > - Does it fail identically for all CPUs or for CPU4 and above only?
> > - Did previous kernels, most importantly 2.6.26, work correctly?
> 
> It turns out 2.6.26 also fails.

OK, so I'll drop the bug from the list of recent regressions.

> It is only failing for CPU4+, I'm not sure why that would be significant.

Because I cannot reproduce it on a single-socket AMD quad-core. :-)

> > Also, can you please attach dmesg output, including the 
> > offlining of a CPU that would later lead to the problem
> > with cpu_up(), to the Bugzilla entry at
> > http://bugzilla.kernel.org/show_bug.cgi?id=11337 ?
> 
> I did.

Thanks.  I think we can further debug this using Bugzilla if you don't mind.

Best,
Rafael
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