x86-64 Uncorrected machine check panic on boot

[Akinobu Mita]

Hello,

I got the following Machine Check Exception on 4-way Opteron Server.
I've tried 2.6.11.7 and 2.6.12-rc2.
The kernel parameter "nomce" could help to boot it up.

I wrote this panic messages by hand.
This panic seems to happen around "arch/x86_64/pci/../../i386/pci/direct.c:28"

==========================================================
Calling initcall 0xffffffff........: netlink_proto_init...
NET: Registered protocol family 16

Calling initcall 0xffffffff........: pcibus_class_init...
Calling initcall 0xffffffff........: pci_driver_init
Calling initcall 0xffffffff........: tty_class_init
Calling initcall 0xffffffff........: mtrr_if_init
Calling initcall 0xffffffff........: pci_direct_init

CPU3: Machine Check Exception: 7 Bank 3: b40000000000083b
RIP 10: <ffffffff802cfefe> {pci_conf1_read+0xce/0x110}
TSC 85ece4f ADDR fdfc000cfe

kernel panic - not syncing: Uncorrected machine check
==========================================================


$ addr2line -e vmlinux ffffffff802cfee0
arch/x86_64/pci/../../i386/pci/direct.c:28

$ addr2line -e vmlinux ffffffff802cfee2
include/asm/io.h:81

$ addr2line -e vmlinux ffffffff802cfefe
include/asm/io.h:84


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