Hi Frode, Sorry for reaching out directly but I figured it might be easier for you to report this to the Ubuntu kernel development team (if not, I can also try to open a launchpad bug myself but my knowledge in that area is limited).
Our OVN CI (in GitHub actions) is broken since Friday, e.g.: https://github.com/ovn-org/ovn/actions/runs/18622640352/job/53147265121 These tests fail: 252: system-ovn-kmod.at:1006 Load Balancer LS hairpin IPv6 UDP - larger than MTU -- parallelization=yes -- ovn_monitor_all=yes lb 253: system-ovn-kmod.at:1006 Load Balancer LS hairpin IPv6 UDP - larger than MTU -- parallelization=yes -- ovn_monitor_all=no lb They fail with: (cat datafile; sleep 3) | nc -6 -u 8800::0088 4040 -p 20000 -o udp_frag_test_c1.recvd NS_EXEC_HEREDOC Ncat: Version 7.92 ( https://nmap.org/ncat ) Ncat: Listening on 4200::1:2021 stderr: Ncat: Message too long. stdout: As there were no OVN (or OVS) user space changes that could've caused this (the last good run was on Thursday) we had a look at other components that might have changed. It seems there was a GitHub ubuntu:24.04 runner image change that happened since. The new version is: Image: ubuntu-24.04 Version: 20251014.76.1 Included Software: https://github.com/actions/runner-images/blob/ubuntu24/20251014.76/images/ubuntu/Ubuntu2404-Readme.md Image Release: https://github.com/actions/runner-images/releases/tag/ubuntu24%2F20251014.76 which uses kernel version 6.14.0-1012-azure. Our last known good CI runs were using kernel version 6.11.0-1018-azure. I had a look at the linux-image-unsigned-6.14.0-1012-azure Ubuntu kernel sources and it seems that we there might be a patch missing there. I think we might be hitting the same issue as in: https://lore.kernel.org/stable/[email protected]/ Checking the unpacked Ubuntu kernel sources it seems the 6.11 kernel didn't have the buggy patch: a18dfa9925b9ef6107ea3aa5814ca3c704d34a8a "ipv6: save dontfrag in cork" While kernel 6.14.0-1012-azure includes the code from the buggy patch but only has the first of the followup fixes: - 54580ccdd8a9c6821fd6f72171d435480867e4c3 "ipv6: remove leftover ip6 cookie initializer" - 096208592b09c2f5fc0c1a174694efa41c04209d "ipv6: replace ipcm6_init calls with ipcm6_init_sk" <<< the code doesn't have this commit. Would you happen to have some time to double check my findings and maybe report this to the Ubuntu kernel team? Also, it seems ovn-kubernetes CI is affected by this too: https://github.com/ovn-kubernetes/ovn-kubernetes/actions/runs/18638480933/job/53134392523#step:16:4399 [FAIL] [sig-network] Networking Granular Checks: Services [It] should be able to handle large requests: udp [sig-network] Thank you! Best regards, Dumitru _______________________________________________ dev mailing list [email protected] https://mail.openvswitch.org/mailman/listinfo/ovs-dev
