I have problems with panics since 2 years. Diffrent machines, diffrent versions
of FreeBSD (9+). Nothing has changed even in 12-CURRENT.
FreeBSD is used as router/nat(ipnat)/ipfw/dummynet for over 400 desktops.

I have 2 panics in 3h. Previous with only screen photo:
And last:

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This GDB was configured as "amd64-marcel-freebsd"...

Unread portion of the kernel message buffer:
<110>ipfw: 3700 Deny TCP out via em1
<110>ipfw: 3700 Deny TCP out via em1
<110>ipfw: 3700 Deny TCP in via em1
Kernel page fault with the following non-sleepable locks held:
shared rw ipf IP NAT rwlock (ipf IP NAT rwlock) r = 0 (0xffffffff818d6170)
locked @ /usr/src/sys/contrib/ipfilter/netinet/ip_nat.c:4925
shared rw ipf filter rwlock (ipf filter rwlock) r = 0 (0xffffffff818d6058)
locked @ /usr/src/sys/contrib/ipfilter/netinet/fil.c:3024
shared rm PFil shared rmlock (PFil shared rmlock) r = 0 (0xffffffff81eab3f0)
locked @ /usr/src/sys/net/pfil.c:78
stack backtrace:
#0 0xffffffff80af7b90 at witness_debugger+0x70
#1 0xffffffff80af8e77 at witness_warn+0x3d7
#2 0xffffffff80f34507 at trap_pfault+0x57
#3 0xffffffff80f33bbb at trap+0x28b
#4 0xffffffff80f14461 at calltrap+0x8
#5 0xffffffff803a7e87 at ipf_proxy_check+0x127
#6 0xffffffff8039b36b at ipf_nat_out+0x6db
#7 0xffffffff8039a72f at ipf_nat_checkout+0x1ff
#8 0xffffffff80381496 at ipf_check+0x726
#9 0xffffffff80ba08cb at pfil_run_hooks+0x8b
#10 0xffffffff80c0326b at ip_tryforward+0x26b
#11 0xffffffff80c058b7 at ip_input+0x377
#12 0xffffffff80b9f7b0 at netisr_dispatch_src+0x80
#13 0xffffffff80cecc07 at dummynet_send+0x167
#14 0xffffffff80cec530 at dummynet_task+0x310
#15 0xffffffff80aeb5bc at taskqueue_run_locked+0x13c
#16 0xffffffff80aec138 at taskqueue_thread_loop+0x88
#17 0xffffffff80a5bd74 at fork_exit+0x84

Fatal trap 12: page fault while in kernel mode
cpuid = 0; apic id = 00
fault virtual address   = 0xe
fault code              = supervisor read data, page not present
instruction pointer     = 0x20:0xffffffff803a09cd
stack pointer           = 0x28:0xfffffe023ab3e4e0
frame pointer           = 0x28:0xfffffe023ab3e5c0
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         = 0 (dummynet)
trap number             = 12
panic: page fault
cpuid = 0
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe023ab3e060
vpanic() at vpanic+0x182/frame 0xfffffe023ab3e0e0
panic() at panic+0x43/frame 0xfffffe023ab3e140
trap_fatal() at trap_fatal+0x331/frame 0xfffffe023ab3e1a0
trap_pfault() at trap_pfault+0x1fd/frame 0xfffffe023ab3e200
trap() at trap+0x28b/frame 0xfffffe023ab3e410
calltrap() at calltrap+0x8/frame 0xfffffe023ab3e410
--- trap 0xc, rip = 0xffffffff803a09cd, rsp = 0xfffffe023ab3e4e0, rbp =
0xfffffe023ab3e5c0 ---
ipf_p_ftp_process() at ipf_p_ftp_process+0x16d/frame 0xfffffe023ab3e5c0
ipf_proxy_check() at ipf_proxy_check+0x127/frame 0xfffffe023ab3e630
ipf_nat_out() at ipf_nat_out+0x6db/frame 0xfffffe023ab3e690
ipf_nat_checkout() at ipf_nat_checkout+0x1ff/frame 0xfffffe023ab3e740
ipf_check() at ipf_check+0x726/frame 0xfffffe023ab3e8b0
pfil_run_hooks() at pfil_run_hooks+0x8b/frame 0xfffffe023ab3e940
ip_tryforward() at ip_tryforward+0x26b/frame 0xfffffe023ab3e9c0
ip_input() at ip_input+0x377/frame 0xfffffe023ab3ea20
netisr_dispatch_src() at netisr_dispatch_src+0x80/frame 0xfffffe023ab3ea80
dummynet_send() at dummynet_send+0x167/frame 0xfffffe023ab3eac0
dummynet_task() at dummynet_task+0x310/frame 0xfffffe023ab3eb20
taskqueue_run_locked() at taskqueue_run_locked+0x13c/frame 0xfffffe023ab3eb80
taskqueue_thread_loop() at taskqueue_thread_loop+0x88/frame 0xfffffe023ab3ebb0
fork_exit() at fork_exit+0x84/frame 0xfffffe023ab3ebf0
fork_trampoline() at fork_trampoline+0xe/frame 0xfffffe023ab3ebf0
--- trap 0, rip = 0, rsp = 0, rbp = 0 ---
Uptime: 3h12m45s
Dumping 641 out of 8158 MB:..3%..13%..23%..33%..43%..53%..63%..73%..83%..93%

Reading symbols from /boot/kernel/fdescfs.ko...Reading symbols from
Loaded symbols for /boot/kernel/fdescfs.ko
Reading symbols from /boot/kernel/iscsi.ko...Reading symbols from
Loaded symbols for /boot/kernel/iscsi.ko
#0  doadump (textdump=1) at pcpu.h:221
221             __asm("movq %%gs:%1,%0" : "=r" (td)
(kgdb) list *0xffffffff803a09cd
0xffffffff803a09cd is in ipf_p_ftp_process (ip_ftp_pxy.c:1336).
1331            aps = nat->nat_aps;
1333            sel = aps->aps_sel[1 - rv];
1334            sel2 = aps->aps_sel[rv];
1335            if (rv == 1) {
1336                    seqoff = aps->aps_seqoff[sel];
1337                    if (aps->aps_seqmin[sel] > seqoff + thseq)
1338                            seqoff = aps->aps_seqoff[!sel];
1339                    ackoff = aps->aps_ackoff[sel2];
1340                    if (aps->aps_ackmin[sel2] > ackoff + thack)
Current language:  auto; currently minimal
(kgdb) backtrace
#0  doadump (textdump=1) at pcpu.h:221
#1  0xffffffff80a97b75 in kern_reboot (howto=<value optimized out>) at
#2  0xffffffff80a9814b in vpanic (fmt=<value optimized out>, ap=<value optimized
out>) at /usr/src/sys/kern/kern_shutdown.c:759
#3  0xffffffff80a98193 in panic (fmt=0x0) at
#4  0xffffffff80f344a1 in trap_fatal (frame=0xfffffe023ab3e420, eva=14) at
#5  0xffffffff80f346ad in trap_pfault (frame=0xfffffe023ab3e420, usermode=0) at
#6  0xffffffff80f33bbb in trap (frame=0xfffffe023ab3e420) at
#7  0xffffffff80f14461 in calltrap () at
#8  0xffffffff803a09cd in ipf_p_ftp_process (softf=<value optimized out>,
fin=0xfffffe023ab3e780, nat=0xfffff801c2ad7400, 
    ftp=0xfffff800433e4c00, rv=<value optimized out>) at ip_ftp_pxy.c:1331
#9  0xffffffff803a7e87 in ipf_proxy_check (fin=0xfffffe023ab3e780,
    at /usr/src/sys/contrib/ipfilter/netinet/ip_proxy.c:992
#10 0xffffffff8039b36b in ipf_nat_out (fin=0xfffffe023ab3e780,
nat=0xfffff801c2ad7400, natadd=<value optimized out>, nflags=1)
    at /usr/src/sys/contrib/ipfilter/netinet/ip_nat.c:5315
#11 0xffffffff8039a72f in ipf_nat_checkout (fin=<value optimized out>,
passp=<value optimized out>)
    at /usr/src/sys/contrib/ipfilter/netinet/ip_nat.c:5019
#12 0xffffffff80381496 in ipf_check (ctx=<value optimized out>, ip=<value
optimized out>, hlen=<value optimized out>, 
    ifp=<value optimized out>, out=1, mp=<value optimized out>) at
#13 0xffffffff80ba08cb in pfil_run_hooks (ph=<value optimized out>, mp=<value
optimized out>, ifp=<value optimized out>, 
    dir=<value optimized out>, inp=<value optimized out>) at
#14 0xffffffff80c0326b in ip_tryforward (m=0xffffffff818d5fe0) at
#15 0xffffffff80c058b7 in ip_input (m=0x0) at
#16 0xffffffff80b9f7b0 in netisr_dispatch_src (proto=1, source=0,
m=0xfffff80009cf2900) at /usr/src/sys/net/netisr.c:1120
#17 0xffffffff80cecc07 in dummynet_send (m=<value optimized out>) at
#18 0xffffffff80cec530 in dummynet_task (context=<value optimized out>,
pending=<value optimized out>)
    at /usr/src/sys/netpfil/ipfw/ip_dn_io.c:746
#19 0xffffffff80aeb5bc in taskqueue_run_locked (queue=<value optimized out>) at
#20 0xffffffff80aec138 in taskqueue_thread_loop (arg=<value optimized out>) at
#21 0xffffffff80a5bd74 in fork_exit (callout=0xffffffff80aec0b0
<taskqueue_thread_loop>, arg=0xffffffff81e0c278, 
    frame=0xfffffe023ab3ec00) at /usr/src/sys/kern/kern_fork.c:1038
#22 0xffffffff80f1499e in fork_trampoline () at
#23 0x0000000000000000 in ?? ()

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