linux-kernel - Re: [Bug #11224] Only three cores found on quad-core machine.

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Date:	Wed, 8 Oct 2008 15:24:40 +1100
From:	Nick Piggin <nickpiggin@...oo.com.au>
To:	Dave Jones <davej@...hat.com>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Kernel Testers List <kernel-testers@...r.kernel.org>
Subject: Re: [Bug #11224] Only three cores found on quad-core machine.

On Wednesday 08 October 2008 02:32, Dave Jones wrote:
> On Wed, Oct 08, 2008 at 02:18:18AM +1100, Nick Piggin wrote:
>  > On Sunday 05 October 2008 04:32, Rafael J. Wysocki wrote:
>  > > This message has been generated automatically as a part of a report
>  > > of recent regressions.
>  > >
>  > > The following bug entry is on the current list of known regressions
>  > > from 2.6.26.  Please verify if it still should be listed and let me
>  > > know (either way).
>  > >
>  > >
>  > > Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=11224
>  > > Subject		: Only three cores found on quad-core machine.
>  > > Submitter	: Dave Jones <davej@...hat.com>
>  > > Date		: 2008-08-01 18:15 (65 days old)
>  > > References	: http://marc.info/?l=linux-kernel&m=121761475224719&w=4
>  >
>  > Dave, is your CPU2 getting stuck in calibrate_delay? Can you still
>  > reproduce the bug? What if you boot the kernel with lpj=<something sane
>  > like 2666785> in order to skip the calibrate_delay code?
>  >
>  > If that helps, can you try adding some printks to narrow down where it
>  > is getting stuck?
>
> This is going to sound strange, but I've forgotten which box that was.
> I'm due to reinstall all my test boxes now that the next Fedora beta
> has come out anyway, so I'll hopefully figure out by the end of the week :)

That does sound strange ;) But I can't believe that! It would be really
interesting if it was stuck in calibrate_delay, but maybe the backtrace
is just messed up...

If you do manage to reproduce it, I would be quite interested. Otherwise,
I think we can say it's not a showstopper for 2.6.27.
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