2.6.12 hangs on boot

[Alexander Y. Fomichev]

G' day

I've been trying to switch from 2.6.12-rc3 to 2.6.12 on Dual EM64T 2.8 GHz
[ MoBo: Intel E7520, intel 82801 ]
but kernel hangs on boot right after records:

Booting processor 2/1 rip 6000 rsp ffff8100023dbf58
Initializing CPU#2

( below is a link to full boot trace, actually -git3 but no differences)
http://sysadminday.org.ru/2.6.12-hang-on-boot/2.6.12-git3-hang

An attempt to enable debug:
+CONFIG_ACPI_DEBUG=y
+CONFIG_DEBUG_SLAB=y
+CONFIG_DEBUG_PREEMPT=y
+CONFIG_DEBUG_SPINLOCK=y
+CONFIG_DEBUG_SPINLOCK_SLEEP=y
+CONFIG_DEBUG_KOBJECT=y
+CONFIG_DEBUG_INFO=y
+CONFIG_INIT_DEBUG=y
gives rather strange result, kernel boots successfully ( with a lot of
debuging messages of course but i couldn't find something suspicious )
http://sysadminday.org.ru/2.6.12-hang-on-boot/2.6.12-git3-debug

config for 2.6.12 have been taken from previous one, only
'make oldconfig' has been made.
http://sysadminday.org.ru/2.6.12-hang-on-boot/2.6.12-git3.config

Hang 100% reproducible on at least two of my EM64T hosts.
( actualy the same configuration as of MoBo/CPU )

-- 
Best regards.
        Alexander Y. Fomichev <gluk@xxxxxxx>
        Public PGP key: http://sysadminday.org.ru/gluk.asc
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