On Fri, 23 May 2025 at 01:00, David Ahern <dsah...@kernel.org> wrote: > > On 5/22/25 4:55 PM, Luca Boccassi wrote: > > On Thu, 22 May 2025 at 20:41, Adel Belhouane <bugs....@free.fr> wrote: > >> > >> Package: iproute2 > >> Version: 6.14.0-3 > >> Severity: normal > >> X-Debbugs-Cc: bugs....@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 > > > > Hi Stephen and David, > > > > It looks like there's a regression in iproute2 6.14, and 'ip monitor' > > no longer works with kernels < 6.14. Could you please have a look when > > you have a moment? Thanks! > > were not a lot of changes, so most likely the multiaddress or anycast > address changes from Yuyang Huang. Please take a look.
The original reporter suggested it was this commit that introduced the regression: https://git.kernel.org/pub/scm/network/iproute2/iproute2.git/commit/?h=v6.14.0&id=7240e0e40f8332dd9f11348700c0c96b8df4ca5b
