[Bug 224231] [ipfw] kernel panic when using ipfw nat

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=224231

            Bug ID: 224231
           Summary: [ipfw] kernel panic when using ipfw nat
           Product: Base System
           Version: 11.1-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: me at rin.cat

Fatal trap 9: general protection fault while in kernel mode
cpuid = 6: apic id = 06 
instruction pointer = Ox20:8xffffffff80ae9aa3 
stack pointer       = Ox28:8xfffffe085620e370 
frame pointer       = Ox28:0xfffffe085620e3a0 
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     = 952 (syncthing) 
trap number         = 9 
panic: general protection fault 
cpuid = 6 
KDB: stack backtrace: 
#0 0xffffffff80aadac7 at kdb_backtrace+0x67 
#1 0xffffffff80a6bba6 at vpanic+0x186 
#2 0xffffffff80a6ba13 at panic+0x43 
#3 0xffffffff80edf832 at trap_fatal+0x322 
#4 0xffffffff80edee9e at trap+0x5e 
#5 0xffffffff88ec36d1 at calltrap+0x8 
#6 0xffffffff80c80d37 at ip6_fragment+0x2e7 
#7 0xffffffff80c82bce at ip6_output+0x1d5e 
#8 0xffffffff80c532f9 at tcp_output+0x1939 
#9 0xffffffff80c60fab at tcp6_usr_connect+0x2bb 
#10 0xffffffff80af9c7f at kern_connectat+Ox11f 
#11 0xffffffff80af9b37 at sys connect+0x77 
#12 0xffffffff80ee0394 at amd64_sysca11+0x6c4 
#13 0xffffffff8Oec39bb at Xfast_syscall+Oxfb

This happened repeatedly when I do in-kernel nat with ipfw.
When I disabled nat, no more panic.

Memory dump available if needed (over 1GB).

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