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

Nick Piggin
2008-10-08T04:24:59Z

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@redhat.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.