[Bug 272965] 14.0-ALPHA1 too: armv7 'Alignment Fault' on read panic during udp_input for kyua's sys/netinet6/exthdr:exthdr ; other udp_input related panics

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=272965

--- Comment #15 from commit-hook@FreeBSD.org ---
A commit in branch main references this bug:

URL:
https://cgit.FreeBSD.org/src/commit/?id=9ee759f3676f700f8224a95216f659f87f5d9ae9

commit 9ee759f3676f700f8224a95216f659f87f5d9ae9
Author:     Michal Meloun <mmel@FreeBSD.org>
AuthorDate: 2025-05-01 08:54:05 +0000
Commit:     Michal Meloun <mmel@FreeBSD.org>
CommitDate: 2025-05-04 11:48:04 +0000

    Decorate IPv4 structures used for byte buffer overlays as packed.

    The C language only allows pointer casting to another type if both sides
have
    compatible alignments, unaligned casts causes undefined behavior.
    Since we do not have declared (and therefore not checked)  mbuf alignments
for
    the various input functions in the IP stack, the worst case (alignment to
    char*) should be expected.

     A lot of work still needs to be done on IPv6, especially on the terrible
    accesses to in6_addr members.

    It should have no performance impact on all unaligned architectures.

    MFC after:      1 month
    Reviewed by:    kib
    PR:             272965
    Differential Revision:  https://reviews.freebsd.org/D50103

 sys/netinet/dccp.h                |  2 +-
 sys/netinet/ip.h                  |  4 ++--
 sys/netinet/ip_var.h              |  2 +-
 sys/netinet/pim.h                 |  2 +-
 sys/netinet/tcp.h                 |  2 +-
 sys/netinet/udp.h                 |  2 +-
 tests/sys/netinet/ip_reass_test.c | 12 ++++++++----
 7 files changed, 15 insertions(+), 11 deletions(-)

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