Failure to boot with SMP kernel on x86_64 SMP system ...

[Sandor W. Sklar]

Hi, Folks ...

One of my Sun X4100s was hung this morning.  All of them are running  
RHEL 4 update 4. On rebooting with an SMP kernel, it consistently  
hangs after printing the below to the console:

===========================================================

powernow-k8: Found 4 AMD Athlon 64 / Opteron processors (version  
1.50.04-rh)
powernow-k8: MP systems not supported by PSB BIOS structure
powernow-k8: init not cpu 0
powernow-k8: init not cpu 0
powernow-k8: init not cpu 0
ACPI: (supports S0 S1 S4 S5)
ACPI wakeup devices:
PCI1 USB0 ETHR USB1
Unable to handle kernel NULL pointer dereferenceFreeing unused kernel  
memory: 192k freed

============================================================

All of the systems I have are running the same kernel  
(2.6.9-42.0.2.ELsmp), but I also tried booting it with 2.6.9-34.ELsmp  
kernel, with the same exact result.

I can boot it fine using the "non-SMP" kernel, but of course, I wind  
up with only one CPU.

This kernel isn't new to the system; it has been running fine with it  
for a while. I ran the hardware diagnostic DVD, and it found no  
hardware problems.

So, I'm fishing for ideas here ... anyone got any?  Thanks!

	-s-