7.1-STABLE crash

[Asmodean Dark]

Hello,

We have cluster of FreeBSD VPN servers with running mpd3.18 and sometimes it crash:

# uname -a
FreeBSD vpn 7.1-STABLE FreeBSD 7.1-STABLE #13: Wed Mar 18 14:53:13 YEKT 2009     root at vpn:/usr/src/sys/i386/compile/kconf  i386

# dmesg
Fatal trap 12: page fault while in kernel mode
cpuid = 1; apic id = 01
fault virtual address   = 0x8
fault code              = supervisor read, page not present
instruction pointer     = 0x20:0x806dcb88
stack pointer           = 0x28:0xe70775c4
frame pointer           = 0x28:0xe70775e8
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         = 22 (em0 taskq)
trap number             = 12

(kgdb) bt
#0  0x8063d6b0 in doadump ()
#1  0x8063dc44 in boot ()
#2  0x8063e0ca in panic ()
#3  0x807dab3d in trap_fatal ()
#4  0x807daeba in trap_pfault ()
#5  0x807db7bd in trap ()
#6  0x807c2a3b in calltrap ()
#7  0x806dcb88 in rn_match ()
#8  0x806ddc8a in rn_lookup ()
#9  0x8070e460 in ipfw_chk (args=0xe70175fc) at ../../../netinet/ip_fw2.c:1894
#10 0x80710c3d in ipfw_check_in (arg=0x0, m0=0xe7017700, ifp=0x91c5a800, dir=1, inp=0x0) at ../../../netinet/ip_fw_pfil.c:125
#11 0x806dc20f in pfil_run_hooks ()
#12 0x80713984 in ip_input (m=0x91954c00) at ../../../netinet/ip_input.c:416
#13 0x806ec0d9 in ng_iface_rcvdata ()
#14 0x806e9570 in ng_apply_item ()
#15 0x806e8569 in ng_snd_item ()
#16 0x806e9570 in ng_apply_item ()
#17 0x806e8569 in ng_snd_item ()
#18 0x806e9570 in ng_apply_item ()
#19 0x806e8569 in ng_snd_item ()
#20 0x806f16a7 in ng_ppp_proto_recv ()
#21 0x806f3ed2 in ng_ppp_rcvdata ()
#22 0x806e9570 in ng_apply_item ()
#23 0x806e8569 in ng_snd_item ()
#24 0x806e9570 in ng_apply_item ()
#25 0x806e8569 in ng_snd_item ()
#26 0x806ee3c3 in ng_ksocket_incoming2 ()
#27 0x806e969d in ng_apply_item ()
#28 0x806ea8aa in ngintr ()
#29 0x806dab72 in swi_net ()
#30 0x8061e265 in ithread_loop ()
#31 0x8061adf5 in fork_exit ()
#32 0x807c2ab0 in fork_trampoline ()

What can I do with it? Are additional info needed?

Thanks.