Re: IBM xSeries 336 dual Xeon hangs on boot when APIC enabled

On Tuesday 15 August 2006 05:25, Arjan van Leeuwen wrote:
2006/8/14, John Baldwin <jhb@xxxxxxxxxxx>:

On Monday 14 August 2006 04:45, Arjan van Leeuwen wrote:
2006/8/13, Michael Landin Hostbaek <mich@xxxxxxxxxxx>:

Arjan van Leeuwen (avleeuwen) writes:
I'm trying to boot FreeBSD 6.1-RELEASE/amd64 on an IBM xSeries 336
machine
with dual Xeons 3.2GHz installed.

The installation was successful, but
if I try to boot the SMP kernel, it hangs after detection of SCSI
and
ATA
devices (possibly when doing the initialization of the mpt0 RAID
controller,
or when it tries to start the second CPU?).


I've just had a similar problem with an IBM xSeries 232 - it would not
boot with apic enabled.. I chased the problem down to the network
adapter (fxp) - and when disabling the planar ethernet in BIOS it
would
boot with SMP.


Yes! Indeed, the system boots perfectly well if I disable both network
adapters (bge, see
dmesg.boot
posted earlier). However, I need at least one functioning network
adapter...

I managed to get both NIC and SMP working by disabling a bunch of stuff
in the BIOS, fx both serial ports and also the floppy drive.


... and this doesn't seem to work for me.

So:
1) Why does my system hang if I enable the network adapter?
2) Why does it only hang if APIC is enabled?

Arjan

Compile DDB into your SMP kernel. When it 'hangs', break into ddb and run
'show intrcnt' to see if you are having an interrupt storm.


I can't break into DDB during the hang, it's not responding. I can do
it just before the hang, but that doesn't seem very helpful.

Is there another way to force it to break?

If you can't break into DDB then it must be spinning with interrupts
disabled. If you have firewire you can try running kgdb over firwire
to debug it.

--
John Baldwin
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