panic: PAE with 16GB ram

[in2]

Hi,
I use Tyan S2882 with dual Opteron and FreeBSD 4.10-RELEASE with
PAE support. it works fine with 8GB and 12GB ram, but panics with
16GB (with the same kernel) :

Fatal trap 12: page fault while in kernel mode
mp_lock = 00000009; cpuid = 0; lapic.id = 00000000
fault virtual address   = 0x69bc8000
fault code              = supervisor write, page not present
instruction pointer     = 0x8:0x6a259d26
stack pointer           = 0x10:0x6a3b3f44
frame pointer           = 0x10:0x6a3b3f5c
code segment            = base 0x0, limit 0xfffff, type 0x1b
                        = DPL 0, pres 1, def32 1, gran 1
processor eflags        = interrupt enabled, resume, IOPL = 0
current process         = Idle
interrupt mask          = net tty bio cam  <- SMP: XXX
trap number             = 12
panic: page fault
mp_lock = 00000009; cpuid = 0; lapic.id = 00000000
Uptime: 0s

The same thing occurs in both 4.10-RELEASE and 4.11-stable. I even
loaded the fault-safe setting in BIOS but it was still not working.
my dmesg is in http://www.in2home.org/download/dmesg, and kernel
config is in http://www.in2home.org/download/kernel .

thanks for your help. :)