[Bug 293227] VNET jail regression on 14-STABLE from 14.3 using bridge and epair

From: <bugzilla-noreply_at_freebsd.org>
Date: Thu, 19 Feb 2026 14:22:12 UTC
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=293227

--- Comment #8 from commit-hook@FreeBSD.org ---
A commit in branch main references this bug:

URL:
https://cgit.FreeBSD.org/src/commit/?id=ada4dc77577f7162353e8c2916ba5c258b6210f0

commit ada4dc77577f7162353e8c2916ba5c258b6210f0
Author:     Timo Völker <timo.voelker@fh-muenster.de>
AuthorDate: 2026-02-19 14:15:10 +0000
Commit:     Michael Tuexen <tuexen@FreeBSD.org>
CommitDate: 2026-02-19 14:21:01 +0000

    icmp6: clear csum_flags on mbuf reuse

    When icmp6 sends an ICMPv6 message, it reuses the mbuf of the packet
    that triggered the ICMPv6 message and prepends an IPv6 and ICMPv6
    header. For a locally generated packet with checksum offloading, the
    mbuf still has csum_flags set indicating that a SCTP/TCP/UDP checksum
    has to be computed and inserted. Since this not the case anymore,
    csum_flags need to be cleared.

    PR:                     293227
    Reviewed by:            kp, zlei, tuexen
    MFC after:              3 days
    Differential Revision:  https://reviews.freebsd.org/D55367

 sys/netinet6/icmp6.c | 1 +
 1 file changed, 1 insertion(+)

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