Fatal trap 12 in exec_copyout_strings()

Got this on a dual amd64 with 24GB RAM running 6.0 from last week:

Fatal trap 12: page fault while in kernel mode
cpuid = 1; apic id = 01
fault virtual address   = 0xffffffffa9cdc000
fault code      = supervisor read, page not present
instruction pointer     = 0x8:0xffffffff8037759f
stack pointer         = 0x10:0xffffffffba1637d0
frame pointer         = 0x10:0xffffffffba163820
code segment    = base 0x0, limit 0xfffff, type 0x1b
                = DPL 0, pres 1, long 1, def32 0, gran 1
processor eflags        = interrupt enabled, resume, IOPL = 0
current process         = 52247 (sh)
[thread pid 52247 tid 100149 ]
Stopped at      exec_copyout_strings+0x12f:
db> wh
Tracing pid 52247 tid 100149 td 0xffffff016e5724c0
exec_copyout_strings() at exec_copyout_strings+0x12f
do_execve() at do_execve+0x39a
kern_execve() at kern_execve+0xab
execve() at execve+0x49
syscall() at syscall+0x382
Xfast_syscall() at Xfast_syscall+0xa8
--- syscall (59, FreeBSD ELF64, execve), rip = 0x80090622c, rsp = 0x7fffffffe058, rbp = 0xffffffff ---
db>

Unfortunately I am unable to dump on this machine.

Kris