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SubjectRe: Intermittent panic at boot on x86-64
On Thu, Jul 22, 2004 at 05:14:11PM -0400, Daniel Jacobowitz wrote:
> On Sat, Jul 17, 2004 at 07:09:24PM -0400, Daniel Jacobowitz wrote:
> > I'm trying to set up a dual Opteron 244 system using Linux 2.4.7. It
> > doesn't reliably boot in SMP, although I've never had a problem in UP. It's
> > possible that it's a hardware problem - the machine is new - but I don't
> > think so.
> >
> > I get a lot of different results when I boot an SMP kernel: an NMI watchdog
> > reported lockup in smp_boot_cpus [first log below], a single processor boot
> > [second log below], an NMI watchdog lockup in ret_from_intr, also during
> > smp_boot_cpus [third log below], an OK boot (maybe 33% of the time, fourth
> > log below), or an error complaining that the IO-APIC and timer don't work
> > and I should go bug Ingo (couldn't reproduce this now but it's from
> > check_timer in io_apic.c).
> >
> > If it does boot both processors, it seems to run OK.
> Really confused now... I just had a successful boot with somehow messed
> up timers. Take a look at the BogoMIPS here:

For the record... with a huge amount of assistance from Andi, and a lot
of trial and error, I tracked down the problem. This is a symptom of
having USB Legacy Support turned on in the BIOS of a K8T Master2-FAR
(BIOS rev 1.2).

I turned it on because, without it, I couldn't talk to grub from my USB
keyboard. If I hit a key on the keyboard at the grub prompt, before
Linux got going, then all was well. If I let it try to autoboot,
however, the timer is scrogged. Andi's guess was that the SMM (System
Management Mode) code in the BIOS is doing something nasty.

Without it I can't kick grub by hand, but I can autoboot. I should
just go find another PS2 keyboard.

Daniel Jacobowitz
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