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Date:      Sun, 10 Dec 2017 21:13:53 +0000
From:      bugzilla-noreply@freebsd.org
To:        freebsd-bugs@FreeBSD.org
Subject:   [Bug 224231] [ipfw] kernel panic when using ipfw nat
Message-ID:  <bug-224231-8@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D224231

            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@FreeBSD.org
          Reporter: me@rin.cat

Fatal trap 9: general protection fault while in kernel mode
cpuid =3D 6: apic id =3D 06=20
instruction pointer =3D Ox20:8xffffffff80ae9aa3=20
stack pointer       =3D Ox28:8xfffffe085620e370=20
frame pointer       =3D Ox28:0xfffffe085620e3a0=20
code segment        =3D base 0x0, limit 0xfffff, type 0x1b=20
                    =3D DPL 0, pres 1, long 1, def32 0. gran 1=20
processor eflags    =3D interrupt enabled, resume, IOPL =3D 0=20
current process     =3D 952 (syncthing)=20
trap number         =3D 9=20
panic: general protection fault=20
cpuid =3D 6=20
KDB: stack backtrace:=20
#0 0xffffffff80aadac7 at kdb_backtrace+0x67=20
#1 0xffffffff80a6bba6 at vpanic+0x186=20
#2 0xffffffff80a6ba13 at panic+0x43=20
#3 0xffffffff80edf832 at trap_fatal+0x322=20
#4 0xffffffff80edee9e at trap+0x5e=20
#5 0xffffffff88ec36d1 at calltrap+0x8=20
#6 0xffffffff80c80d37 at ip6_fragment+0x2e7=20
#7 0xffffffff80c82bce at ip6_output+0x1d5e=20
#8 0xffffffff80c532f9 at tcp_output+0x1939=20
#9 0xffffffff80c60fab at tcp6_usr_connect+0x2bb=20
#10 0xffffffff80af9c7f at kern_connectat+Ox11f=20
#11 0xffffffff80af9b37 at sys connect+0x77=20
#12 0xffffffff80ee0394 at amd64_sysca11+0x6c4=20
#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).

--=20
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