Loading atapicam causes panic on 8.0-BETA2 #0 r195818 (i386)

System:
FreeBSD RabbitsDen.RabbitsLawn.verizon.net 8.0-BETA2 FreeBSD 8.0-BETA2
#0 r195818: Wed Jul 22 13:50:22 EDT 2009
root_at_RabbitsDen.RabbitsLawn.verizon.net:/usr/obj/usr/src/sys/TPX60  i386

Hardware:
Master: acd0 <MATSHITADVD-RAM UJ-842/RB01> ATA/ATAPI revision 6
*NOTE*: Curiously enough, I can trigger this without drive being present
(it is in the media slice of ThinkPad x60)

To reproduce:
kldload atapicd; kldload atapicam

Crash summary:
http://members.verizon.net/~akovalenko/Misc/core.txt.1

Backtrace:
(kgdb) bt
#0  doadump () at pcpu.h:246
#1  0xa0586614 in boot (howto=260)
at /usr/src/sys/kern/kern_shutdown.c:419
#2  0xa058692b in panic (fmt=Variable "fmt" is not available.
) at /usr/src/sys/kern/kern_shutdown.c:575
#3  0xa076ddd5 in trap_fatal (frame=0xfa388678, eva=1180)
at /usr/src/sys/i386/i386/trap.c:933
#4  0xa076e0a3 in trap_pfault (frame=0xfa388678, usermode=0, eva=1180)
at /usr/src/sys/i386/i386/trap.c:846
#5  0xa076ebab in trap (frame=0xfa388678)
at /usr/src/sys/i386/i386/trap.c:528
#6  0xa075281b in calltrap () at /usr/src/sys/i386/i386/exception.s:165
#7  0xaf5ad125 in atapi_action (sim=0xaf4b3300, ccb=0xfa3887a0)
at /usr/src/sys/modules/ata/atapicam/../../../dev/ata/atapi-cam.c:390
#8  0xa0453e58 in xpt_action_default (start_ccb=0xfa3887a0)
at /usr/src/sys/cam/cam_xpt.c:2580
#9  0xa044eb24 in xpt_action (start_ccb=0xfa3887a0)
at /usr/src/sys/cam/cam_xpt.c:2403
#10 0xa0450f77 in xpt_bus_register (sim=0xaf4b3300, parent=0xaf4b4780,
bus=0) at /usr/src/sys/cam/cam_xpt.c:3794
#11 0xaf5acce6 in atapi_cam_attach (dev=0xaf4b4780)
at /usr/src/sys/modules/ata/atapicam/../../../dev/ata/atapi-cam.c:221
#12 0xa05aff94 in device_attach (dev=0xaf4b4780) at device_if.h:178
#13 0xa05b0f5a in device_probe_and_attach (dev=0xaf4b4780)
at /usr/src/sys/kern/subr_bus.c:2552
#14 0xa05b1265 in bus_generic_driver_added (dev=0xa633d980,
driver=0xaf5aed7c) at /usr/src/sys/kern/subr_bus.c:3303
#15 0xa05ae5d4 in devclass_driver_added (dc=0xa61ccd40,
driver=0xaf5aed7c) at bus_if.h:183
#16 0xa05af9d7 in driver_module_handler (mod=0xa70bcc80, what=0,
arg=0xaf5aed64) at /usr/src/sys/kern/subr_bus.c:1036
#17 0xa057471e in module_register_init (arg=0xaf5aed4c)
at /usr/src/sys/kern/kern_module.c:124
#18 0xa056ccdf in linker_load_module (kldname=Variable "kldname" is not
available.
) at /usr/src/sys/kern/kern_linker.c:233
#19 0xa056d1ed in kern_kldload (td=0xa65aab40, file=0xa61ff000
"atapicam", fileid=0xfa388c6c) at /usr/src/sys/kern/kern_linker.c:1015
#20 0xa056d2bf in kldload (td=0xa65aab40, uap=0xfa388cf8)
at /usr/src/sys/kern/kern_linker.c:1043
#21 0xa076e474 in syscall (frame=0xfa388d38)
at /usr/src/sys/i386/i386/trap.c:1073
#22 0xa07528b0 in Xint0x80_syscall ()
at /usr/src/sys/i386/i386/exception.s:261
#23 0x00000033 in ?? ()
Previous frame inner to this frame (corrupt stack?)
(kgdb) 

Please, let me know if I can provide any additional information.

-- 
Alexandre Kovalenko (Олександр Коваленко)