Intermittent crash ..

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On today's -current, and over the last week or so, I've been getting
crashes like this .. any thoughts?

Unread portion of the kernel message buffer:
panic: vm_fault: fault on nofault entry, addr: c14a5000
cpuid = 1
Uptime: 8m40s
Physical memory: 2025 MB
Dumping 173 MB: 158panic: bufwrite: buffer is not busy???
cpuid = 1
 142 126 110 94 78 62 46 30 14 (CTRL-C to abort)  (CTRL-C to abort)
(CTRL-C to abort)

Reading symbols from /boot/modules/kqemu.ko...done.
Loaded symbols for /boot/modules/kqemu.ko
Reading symbols from /usr/local/modules/rtc.ko...done.
Loaded symbols for /usr/local/modules/rtc.ko
#0  doadump () at pcpu.h:246
246     pcpu.h: No such file or directory.
        in pcpu.h
(kgdb) #0  doadump () at pcpu.h:246
#1  0xc06ac340 in boot (howto=260) at /usr/src/sys/kern/kern_shutdown.c:419
#2  0xc06ac7c8 in panic (fmt=0x104 <Address 0x104 out of bounds>)
    at /usr/src/sys/kern/kern_shutdown.c:575
#3  0xc08c6174 in vm_fault (map=0xc1490000, vaddr=3242872832,
    fault_type=1 '\001', fault_flags=0) at /usr/src/sys/vm/vm_fault.c:283
#4  0xc093d3a4 in trap_pfault (frame=0xe7bd4bfc, usermode=0, eva=3242876884)
    at /usr/src/sys/i386/i386/trap.c:835
#5  0xc093dd41 in trap (frame=0xe7bd4bfc) at
/usr/src/sys/i386/i386/trap.c:528
#6  0xc092236b in calltrap () at /usr/src/sys/i386/i386/exception.s:165
#7  0xc069a8fe in free (addr=0xc6478150, mtp=0xc0a4e93c) at vm_page.h:255
#8  0xc06e8db5 in ioctl (td=0xc58aa900, uap=0xe7bd4cf8)
    at /usr/src/sys/kern/sys_generic.c:683
#9  0xc093d5bf in syscall (frame=0xe7bd4d38)
    at /usr/src/sys/i386/i386/trap.c:1073
#10 0xc09223d0 in Xint0x80_syscall ()
    at /usr/src/sys/i386/i386/exception.s:261
#11 0x00000033 in ?? ()
Previous frame inner to this frame (corrupt stack?)
(kgdb)

	Michael

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