Bug#1106321: iproute2: "ip monitor" fails with current trixie's linux kernel / iproute2 combination

From	Adel Belhouane <bugs.a.b@free.fr>
Newsgroups	linux.debian.bugs.dist, linux.debian.kernel
Subject	Bug#1106321: iproute2: "ip monitor" fails with current trixie's linux kernel / iproute2 combination
Date	2025-05-22 21:50 +0200
Message-ID	<KPk5r-4Zw3-1@gated-at.bofh.it> (permalink)
Organization	linux.* mail to news gateway

Cross-posted to 2 groups.

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Package: iproute2
Version: 6.14.0-3
Severity: normal
X-Debbugs-Cc: bugs.a.b@free.fr

Dear Maintainer,

Having iproute2 >= 6.14 while running a linux kernel < 6.14
triggers this bug (tested using debian-13-nocloud-amd64-daily-20250520-2118.qcow2)

    root@localhost:~# ip monitor
    Failed to add ipv4 mcaddr group to list

More specifically this subcommand, which didn't exist in iproute2 6.13
is affected:

    root@localhost:~# ip mon maddr
    Failed to add ipv4 mcaddr group to list
    root@localhost:~# ip -6 mon maddr
    Failed to add ipv6 mcaddr group to list

causing the generic "ip monitor" command to fail.

As trixie will use a 6.12.x kernel, trixie is affected.

bookworm's iproute2/bookworm-backports is also affected since currently
bookworm's backport kernel is also 6.12.x

Workarounds:
* upgrade the kernel to experimental's (currently) 6.14.6-1~exp1
* downgrade iproute2 to 6.13.0-1 (using snapshot.d.o)
* on bookworm downgrade (using snapshot.d.o)
  iproute2 backport to 6.13.0-1~bpo12+1

Details I could gather:

This appears to come from this iproute2 6.14's commit:

https://git.kernel.org/pub/scm/network/iproute2/iproute2.git/commit/?h=v6.14.0&id=7240e0e40f8332dd9f11348700c0c96b8df4ca5b

which appears to depend on new kernel 6.14 rtnetlink features as described
in Kernelnewbies ( https://kernelnewbies.org/Linux_6.14#Networking ):

Add ipv6 anycast join/leave notifications

with this (kernel 6.14) commit:

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=33d97a07b3ae6fa713919de4e1864ca04fff8f80

I guess to fix this one could:

* backport (or have upstream backport) the kernel feature to 6.12.x,
* or supply iproute2 6.13 instead of iproute 6.14 for trixie with
  some versioning trick,
* or patch iproute2 to cope with a kernel not having the API changes

Regards,
Adel Belhouane.

-- System Information:
Debian Release: 13.0
  APT prefers testing
  APT policy: (500, 'testing')
Architecture: amd64 (x86_64)

Kernel: Linux 6.12.27-amd64 (SMP w/2 CPU threads; PREEMPT)
Locale: LANG=C.UTF-8, LC_CTYPE=C.UTF-8 (charmap=UTF-8), LANGUAGE not set
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages iproute2 depends on:
ii  debconf [debconf-2.0]  1.5.91
ii  libbpf1                1:1.5.0-3
ii  libc6                  2.41-7
ii  libcap2                1:2.75-7
ii  libcap2-bin            1:2.75-7
ii  libdb5.3t64            5.3.28+dfsg2-9
ii  libelf1t64             0.192-4
ii  libmnl0                1.0.5-3
ii  libselinux1            3.8.1-1
ii  libtirpc3t64           1.3.6+ds-1
ii  libxtables12           1.8.11-2

iproute2 recommends no packages.

Versions of packages iproute2 suggests:
ii  python3  3.13.3-1

-- debconf information excluded

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Thread

Bug#1106321: iproute2: "ip monitor" fails with current trixie's linux kernel / iproute2 combination Adel Belhouane <bugs.a.b@free.fr> - 2025-05-22 21:50 +0200
  Bug#1106321: iproute2: "ip monitor" fails with current trixie's linux kernel / iproute2 combination Luca Boccassi <bluca@debian.org> - 2025-05-23 01:00 +0200
    Bug#1106321: iproute2: "ip monitor" fails with current trixie's linux kernel / iproute2 combination David Ahern <dsahern@kernel.org> - 2025-05-23 02:20 +0200
  Bug#1106321: iproute2: "ip monitor" fails with current trixie's linux kernel / iproute2 combination Luca Boccassi <bluca@debian.org> - 2025-05-23 02:10 +0200
    Bug#1106321: iproute2: "ip monitor" fails with current trixie's linux kernel / iproute2 combination Yuyang Huang <yuyanghuang@google.com> - 2025-05-23 03:10 +0200
  Bug#1106321: iproute2: "ip monitor" fails with current trixie's linux kernel / iproute2 combination Yuyang Huang <yuyanghuang@google.com> - 2025-05-23 03:20 +0200
    Bug#1106321: iproute2: "ip monitor" fails with current trixie's linux kernel / iproute2 combination David Ahern <dsahern@kernel.org> - 2025-05-23 04:30 +0200
  Bug#1106321: marked as done (iproute2: "ip monitor" fails with  current trixie's linux kernel / iproute2 combination) "Debian Bug Tracking System" <owner@bugs.debian.org> - 2025-05-27 02:10 +0200

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