spin_lock on SCSI

[goetz at net-amp.com]

Hi all,
any idea what I could do about this?
HP WS Dual Xeon 1.7GHz,

running UFS on da0, kernel SMP no APIC_IO, upgrade from dfly2.7xx
fs checked clean
------------------------------------------------------------------------------------------------
x17# more /var/crash/info.0
Dump header from device /dev/serno/16111714099 
<http://www.snapanumber.com/>3.s1b
 Architecture: i386
 Architecture Version: 2
 Dump Length: 259637248B (247 MB)
 Blocksize: 512
 Dumptime: Wed Nov  3 17:51:43 2010
 Hostname: x17.net.intra
 Magic: DragonFly Kern Dump
 Version String: DragonFly v2.8.2.7.g0d8fd-RELEASE #3: Wed Nov  3 
16:44:30 CET 2010
   goetz at x17.net.intra:/usr/obj/usr/src/sys/XEON
 Panic String: spin_lock: 0xc063b7b8, indefinite wait!

 Dump Parity: 625981048
 Bounds: 0
 Dump Status: good
------------------------------------------------------------------------------------------------
--- dmesg ---
. ......
CAM: Configuring 3 busses
Waiting 5 seconds for SCSI devices to settle
CAM: finished configuring all busses
No policy for da0 specified, or policy not found
disk scheduler: set policy of da0 to noop
No policy for da1 specified, or policy not found
disk scheduler: set policy of da1 to noop
No policy for cd0 specified, or policy not found
disk scheduler: set policy of cd0 to noop
da0 at ahc0 bus 0 target 0 lun 0
da0: <COMPAQPC ATLAS10K2-TY184L DDC2> Fixed Direct Access SCSI-3 device
da0: Serial Number 16111714099 <http://www.snapanumber.com/>3
da0: 160.000MB/s transfers (80.000MHz DT, offset 127, 16bit)
da0: Command Queueing Enabled
da0: 17366MB (35566000 512 byte sectors: 255H 63S/T 2213C)
. ....
-----------------------------------------------------------------------------------------------