[Bug 255164] Panic with ipfw/nat under 13.0-RELEASE amd64

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=255164

--- Comment #6 from commit-hook at FreeBSD.org ---
A commit in branch main references this bug:

URL:
https://cgit.FreeBSD.org/src/commit/?id=652908599b6fa7285ee60cb567b97e70b648ac29

commit 652908599b6fa7285ee60cb567b97e70b648ac29
Author:     Mark Johnston <markj at FreeBSD.org>
AuthorDate: 2021-04-21 19:38:01 +0000
Commit:     Mark Johnston <markj at FreeBSD.org>
CommitDate: 2021-04-21 19:47:05 +0000

    Add required checks for unmapped mbufs in ipdivert and ipfw

    Also add an M_ASSERTMAPPED() macro to verify that all mbufs in the chain
    are mapped.  Use it in ipfw_nat, which operates on a chain returned by
    m_megapullup().

    PR:             255164
    Reviewed by:    ae, gallatin
    MFC after:      1 week
    Sponsored by:   The FreeBSD Foundation
    Differential Revision:  https://reviews.freebsd.org/D29838

 sys/netinet/ip_divert.c                  |  6 ++++++
 sys/netpfil/ipfw/ip_fw_nat.c             |  1 +
 sys/netpfil/ipfw/nat64/nat64_translate.c | 10 ++++++++++
 sys/sys/mbuf.h                           | 11 +++++++++++
 4 files changed, 28 insertions(+)

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