[Bug 281397] FreeBSD-SA-24:05 fix causes warnings "pf: ICMP error message too short (ip6)" in the debug log

From: <bugzilla-noreply_at_freebsd.org>
Date: Mon, 09 Sep 2024 18:03:43 UTC
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=281397

            Bug ID: 281397
           Summary: FreeBSD-SA-24:05 fix causes warnings "pf: ICMP error
                    message too short (ip6)" in the debug log
           Product: Base System
           Version: 14.1-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: freebsd_email@congenio.de

As already stated in
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=280701#c80, FreeBSD-SA-24:05
causes log entries like:

"pf: ICMP error message too short (ip6)"

See: https://forum.opnsense.org/index.php?topic=42632.msg211600#msg211600

In order to create the issue, use an iperf3 test over a FreeBSD machine that is
configured as a router.

As told before, all of these logs entries disappear after reverting the changes
introduced by the SA.

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