Xen users - Mar 2008 - bug Dual Xeon Quad Core E5310 Kernel Panic (hangs on boot)

Hi all,

	that''s the situation:

machine: 	IBM x3400 (MT7976) with 2 Xeon E5310 and 4GB of RAM

xen version:	4.01 Enterprise

problem:	Installation CD doesn''t boot, it locks on this error:

---------------------------------------------------------------------------
Xen call trace shows codes about:

vmx_ini_vmcs_config
start_vmx
identify_cpu
smp_store_cpu_info
smp_callin
start_secondary

*********************
Panic on CPU n:
Xen BUG at vncs.c:124
*********************

Reboot in five seconds...
---------------------------------------------------------------------------
	
screenshot of error at: http://valtellinux.it/xen/xenbug.jpg 400k

facts:

1. starting Installation CD in safe mode and booting the fresh installed Xen 
with no options:
:: at reboot the machine hangs on the same error


2. starting Installation CD in safe mode and booting the fresh installed Xen 
with "noapic" and "acpi=off" options:
:: at reboot the machine hangs, no information displayed


3. starting Installation CD in safe mode and booting the fresh installed Xen 
with "nosmp" option or in "safe mode":
:: the machine boots and run but people don''t buy a dual quad core to
run it
with "nosmp" options ;-(

4. same machine, same installation, no particular starting option but with 
ONLY ONE xeon e5310 runs perfectly!!!

Same error occours running Xen flavours of Oracle VM, Centos 5, OpenSuse 10.3 
and Ubuntu 7.10 and, of course on VirtualIron too...

help!

-- 
Ruggero Tonelli
http://www.valtellinux.it
GPG Key-id: 0x96998647

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