Supermicro X7SB4 Fatal trap 12 when ACPI disabled

[Leon Kos]

I am getting Fatal trap 12: page fault while in kernel mode
when booting GENERIC debug kernel with ACPI disabled on Supermicro X7SB4 
motherboard with dual core Xeon CPU.

instruction pointer     =  0x20:0xc0a49aea
[root at cad ~]# nm -n /boot/kernel/kernel|grep c0a49ae
c0a49ae0 T ioapic_get_vector

Booting custom kernel shows up the same routine.

Here is dmesg after boot -v: http://pastebin.ca/936377

[root at cad ~]# sysctl hw.acpi
hw.acpi.supported_sleep_state: S1 S4 S5
hw.acpi.power_button_state: S5
hw.acpi.sleep_button_state: S1
hw.acpi.lid_switch_state: NONE
hw.acpi.standby_state: S1
hw.acpi.suspend_state: S3
hw.acpi.sleep_delay: 1
hw.acpi.s4bios: 0
hw.acpi.verbose: 1
hw.acpi.disable_on_reboot: 0
hw.acpi.handle_reboot: 0
hw.acpi.reset_video: 0
hw.acpi.cpu.cx_lowest: C1

acpidump -dt is located at:
http://www.lecad.uni-lj.si/~leon/tmp/supermicro-x7sb4.asl


Supermicro X7SB4 motherboard with latest BIOS
Boot GENERIC with ACPI disabled
FreeBSD cad.lecad.uni-lj.si 7.0-STABLE FreeBSD 7.0-STABLE #0: Mon Mar 10 
10:26:30 CET 2008 
root at cad.lecad.uni-lj.si:/usr/src/sys/i386/compile/GENERIC  i386

Booting with ACPI does not show this problem.

Another ACPI problem with this board:
Normal boot with ACPI enabled does not handle reboot. It locks up after shutdown and does not reboot. Last
syslog lines are:
Mar 10 08:21:51 cad rc.shutdown: 30 second watchdog timeout expired. Shutdown terminated.
Mar 10 08:21:51 cad init: /bin/sh on /etc/rc.shutdown terminated abnormally, going to single user mode
Mar 10 08:21:51 cad syslogd: exiting on signal 15

Settin hw.acpi.disable_on_reboot and hw.acpi.handle_reboot does not help.

Under FreeBSD 6.3 the same system rebooted normaly.

Kind regards.

Leon Kos, CAD lab, Mech.Eng., University of Ljubljana, Slovenia
(http://www.lecad.uni-lj.si/~leon)