[Bug 255775] panic with ipfw turned on at boot time

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=255775

--- Comment #5 from Andrey V. Elsukov <ae at FreeBSD.org> ---
(In reply to Michael Meiszl from comment #4)
Can you show some output prom kgdb?
I think these commands should work to obtain needed info:

# cd /var/crash/
# kgdb -q /boot/kernel/kernel vmcore.0

f 11
p/x *m
f 8
p/x *m

You also can try to patch the kernel as workaround for test:

--- a/sys/netinet/ip_output.c
+++ b/sys/netinet/ip_output.c
@@ -807,6 +807,7 @@ ip_output(struct mbuf *m, struct mbuf *opt, struct route
*ro, int flags,
                 * Reset layer specific mbuf flags
                 * to avoid confusing lower layers.
                 */
+               m->m_nextpkt = NULL;
                m_clrprotoflags(m);
                IP_PROBE(send, NULL, NULL, ip, ifp, ip, NULL);
                error = ip_output_send(inp, ifp, m, gw, ro,

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