I first thought, that the problem has something to with the
	"Enable hardware memory hole" and "Enable software memory hole"
	settings in the BIOS.

	Unfortunately, as I just experienced, enabling only the hardware
	hole still leaves the panic entirely possible -- it just does
	not strike right away.

	It says: "vm_fault: fault on nofault entry, addr ...."

Fix: 

If the software memory hole is enabled in the BIOS, the panic
	is guaranteed to happen even on a freshly-booted machine.

	The only work-around is to perform the transfers on a freshly
	booted machine. Once the X-sessions are up (and more RAM is
	in use), the panic is likely even when only the hardware
	memory hole is enabled.
How-To-Repeat: 		fwcontrol -M mpg -R file.mpg

	The kgdb's output:

[GDB will not be able to debug user-mode threads: /usr/lib/libthread_db.so: Undefined symbol "ps_pglobal_lookup"]
GNU gdb 6.1.1 [FreeBSD]
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Type "show copying" to see the conditions.
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This GDB was configured as "amd64-marcel-freebsd".
There is no member named pathname.
Reading symbols from /opt/modules/fuse.ko...done.
Loaded symbols for /opt/modules/fuse.ko
Reading symbols from /opt/modules/rtc.ko...done.
Loaded symbols for /opt/modules/rtc.ko

Unread portion of the kernel message buffer:
fwohci0: Isochronous receive err 8402(long)
panic: vm_fault: fault on nofault entry, addr: ffffffffb0713000
cpuid = 0
Uptime: 3h55m18s
Physical memory: 3607 MB
Dumping 532 MB:fwohci0: Isochronous receive err 8402(long)
 517 501fwohci0: Isochronous receive err 8402(long)
 485 469fwohci0: Isochronous receive err 8402(long)
 453fwohci0: Isochronous receive err 8402(long)
 437fwohci0: Isochronous receive err 8402(long)
fwohci0: Isochronous receive err 8402(long)
 421 405fwohci0: Isochronous receive err 8402(long)
 389 373 357 341 325 309 293 277 261 245 229 213 197 181 165 149 133 117 101 85 69 53 37 21 5

#0  doadump () at pcpu.h:194
194		__asm __volatile("movq %%gs:0,%0" : "=r" (td));
(kgdb) #0  doadump () at pcpu.h:194
#1  0x0000000000000004 in ?? ()
#2  0xffffffff802e8b60 in boot (howto=260)
    at /var/src/sys/kern/kern_shutdown.c:409
#3  0xffffffff802e8f7d in panic (fmt=0x104 <Address 0x104 out of bounds>)
    at /var/src/sys/kern/kern_shutdown.c:563
#4  0xffffffff80424f63 in vm_fault (map=0xffffff0001000000, 
    vaddr=18446744072374792192, fault_type=1 '\001', fault_flags=0)
    at /var/src/sys/vm/vm_fault.c:275
#5  0xffffffff8045a4ff in trap_pfault (frame=0xffffffffb22798d0, usermode=0)
    at /var/src/sys/amd64/amd64/trap.c:630
#6  0xffffffff8045ae49 in trap (frame=0xffffffffb22798d0)
    at /var/src/sys/amd64/amd64/trap.c:410
#7  0xffffffff8043f17e in calltrap ()
    at /var/src/sys/amd64/amd64/exception.S:169
#8  0xffffffff804596db in copyout () at /var/src/sys/amd64/amd64/support.S:257
#9  0xffffffff802f0440 in uiomove (cp=0xffffffffb0710000, n=28275, 
    uio=0xffffffffb2279b00) at /var/src/sys/kern/kern_subr.c:168
#10 0xffffffff8021901a in fw_read (dev=Variable "dev" is not available.
)
    at /var/src/sys/dev/firewire/fwdev.c:403
#11 0xffffffff80297ca4 in devfs_read_f (fp=0xffffff0122325a50, 
    uio=0xffffffffb2279b00, cred=Variable "cred" is not available.
) at /var/src/sys/fs/devfs/devfs_vnops.c:880
#12 0xffffffff8031da7d in dofileread (td=0xffffff01384739c0, fd=3, 
    fp=0xffffff0122325a50, auio=0xffffffffb2279b00, offset=Variable "offset" is not available.
) at file.h:242
#13 0xffffffff8031ddee in kern_readv (td=0xffffff01384739c0, fd=3, 
    auio=0xffffffffb2279b00) at /var/src/sys/kern/sys_generic.c:192
#14 0xffffffff8031dedc in read (td=0x60a70c, uap=0xffffffffb0713000)
    at /var/src/sys/kern/sys_generic.c:108
#15 0xffffffff8045a700 in syscall (frame=0xffffffffb2279c70)
    at /var/src/sys/amd64/amd64/trap.c:852
#16 0xffffffff8043f38b in Xfast_syscall ()
    at /var/src/sys/amd64/amd64/exception.S:290
#17 0x000000080070a34c in ?? ()
Previous frame inner to this frame (corrupt stack?)
(kgdb)