On Tue, Nov 07, 2006 at 09:35:32PM -0800, Randy Dunlap wrote:
> On Mon, 23 Oct 2006 15:26:24 -0700 Bryce Harrington wrote:
>
> > On Mon, Oct 09, 2006 at 02:40:24PM -0700, Randy Dunlap wrote:
> > > 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.
> >
> > To followup on this issue...
> >
> > I found a BIOS update for the motherboard of this machine indicating it
> > includes a fix for MCE during hibernate operations; my guess is that
> > cpu hotplug may be triggering this bug.
> >
> > Meanwhile, we checked against a couple other different AMD64 systems;
> > these are behaving correctly.
> >
> > Anyway, thanks for the pointers, it sounds like this is probably just a
> > hardware issue. I'll report back if I find differently.
>
> Regarding the MCE (that the BIOS update did not fix for this one
> particular machine), I don't see the actual Machine Check Exception
> kernel message log anywhere. It would have happened before the
> oops that is printed by this CPU hotplug test. Is the complete
> kerne log available or can it be reproduced?
I never could actually get a bonified MCE error message - the only clue
it was an MCE was your read on the line you highlighted above. All the
info we have is what we posted.
Bryce
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