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Date: Mon, 9 Oct 2006 14:40:24 -0700
From: Randy Dunlap <rdunlap@xenotime.net>
To: Pavel Machek <pavel@ucw.cz>
Cc: Bryce Harrington <bryce@osdl.org>, Andrew Morton <akpm@osdl.org>,
       vatsa@in.ibm.com, torvalds@osdl.org, linux-kernel@vger.kernel.org,
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       lhcs-devel@lists.sourceforge.net
Subject: Re: Status on CPU hotplug issues
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On Sat, 7 Oct 2006 21:57:49 +0000 Pavel Machek wrote:

> Hi!
> 
> > 1.  Oops offlining cpu twice on AMD64 (but not on EM64t)
> >     with the 2.6.18-git22 kernel
> > 
> >     Reported to hotplug lists 10/05:
> >       http://lists.osdl.org/pipermail/hotplug_sig/2006-October/000680.html
> > 
> >     To recreate: offline, online, and then offline a CPU, then oopses
> >       http://crucible.osdl.org/runs/2397/sysinfo/amd01.console
> >       http://crucible.osdl.org/runs/2397/sysinfo/amd01.2/proc/config
> > 
> >     Here's a snippet of the oops:
> > 
> > # echo 0 > /sys/devices/system/cpu/cpu1/online
> > 
> >  Unable to handle kernel NULL pointer dereference at 0000000000000000 RIP:
> >  [<ffffffff80255287>] __drain_pages+0x29/0x5f
> > PGD 7e56d067 PUD 7ee80067 PMD 0
> > Oops: 0000 [1] PREEMPT SMP
> > CPU 0
> > Modules linked in:
> > Pid: 7203, comm: bash Tainted: G   M  2.6.18-git22 #1
>                                  ~~~~~
> kernel is unhappy here. Forced module unload?

Machine check exception.  'G' is Good, same place where 'P'
for proprietary would be.  But yes, kernel or machine is unhappy.

---
~Randy
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