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Date:      Wed, 12 May 2021 09:36:04 +0000
From:      bugzilla-noreply@freebsd.org
To:        ipfw@FreeBSD.org
Subject:   [Bug 255775] panic with ipfw turned on at boot time
Message-ID:  <bug-255775-8303-GrxXoIacsy@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-255775-8303@https.bugs.freebsd.org/bugzilla/>
References:  <bug-255775-8303@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D255775

--- Comment #5 from Andrey V. Elsukov <ae@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 =3D NULL;
                m_clrprotoflags(m);
                IP_PROBE(send, NULL, NULL, ip, ifp, ip, NULL);
                error =3D ip_output_send(inp, ifp, m, gw, ro,

--=20
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