Bug#1127597: linux-image-6.19.0+debian+tj: v6.12.69 - ip6gre regression

From	Tj <tj.iam.tj@proton.me>
Newsgroups	linux.debian.bugs.dist, linux.debian.kernel
Subject	Bug#1127597: linux-image-6.19.0+debian+tj: v6.12.69 - ip6gre regression
Date	2026-02-10 23:00 +0100
Message-ID	<Mn3W1-hfke-1@gated-at.bofh.it> (permalink)
References	<MmS4x-h7vz-1@gated-at.bofh.it>
Organization	linux.* mail to news gateway

Cross-posted to 2 groups.

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Package: linux-image-6.19.0+debian+tj
Followup-For: Bug #1127597
X-Debbugs-Cc: tj.iam.tj@proton.me

I've been working with Bastien in the Matrix Debian room today on making
a reproducer for this. I've successfully done that using two debvm
stable/trixie images linked together via two host TAP interfaces.

With v6.12.63 a ping between the two VMs using their GRE addresses
works; for v6.12.69 it does not.

Analysing packet flow shows the GRE packets arrive on the VM's Ethernet
interface but does not get decapsulated to the ip6gre tunnel interface.

I read through the commits between the two during the day and have
identified several suspects.

I've just started bisecting and building test kernels and will report
back later.

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Bug#1127597: linux-image-6.12.48+deb13-amd64: GRE6 decap fails Bastien Durel <bastien.durel@geekwu.org> - 2026-02-10 10:20 +0100
  Bug#1127597: additional info Bastien Durel <bastien@durel.org> - 2026-02-10 11:10 +0100
  Bug#1127597: linux-image-6.12.48+deb13-amd64: GRE6 decap fails Tobias Fiebig <tobias@fiebig.nl> - 2026-02-10 13:30 +0100
  Processed: Re: Bug#1127597: linux-image-6.12.48+deb13-amd64: GRE6  decap fails "Debian Bug Tracking System" <owner@bugs.debian.org> - 2026-02-10 13:30 +0100
  Bug#1127597: Info received (Bug#1127597: linux-image-6.12.48+deb13-amd64: GRE6 decap fails) Tobias Fiebig <tobias@fiebig.nl> - 2026-02-10 13:50 +0100
  Bug#1127597: linux-image-6.19.0+debian+tj: v6.12.69 - ip6gre regression Tj <tj.iam.tj@proton.me> - 2026-02-10 23:00 +0100
  Bug#1127597: Regression: v6.12.67 ip6_tunnel: ip6gre decapsulation fails Tj <tj.iam.tj@proton.me> - 2026-02-11 06:10 +0100
    Bug#1127597: Regression: v6.12.67 ip6_tunnel: ip6gre decapsulation fails Greg KH <gregkh@linuxfoundation.org> - 2026-02-11 06:40 +0100
  Bug#1127597: Regression: v6.12.67 ip6_tunnel: ip6gre decapsulation fails F!nTcH <fintch@fintch.org> - 2026-03-04 18:50 +0100
    Bug#1127597: Regression: v6.12.67 ip6_tunnel: ip6gre decapsulation fails Salvatore Bonaccorso <carnil@debian.org> - 2026-03-05 10:30 +0100
  Bug#1127597: marked as done (linux-image-6.12.48+deb13-amd64:  GRE6 decap fails) "Debian Bug Tracking System" <owner@bugs.debian.org> - 2026-03-13 19:40 +0100

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