[Bug 2037667] Re: Regression on Jammy's kernel 5.15 when creating ip6gre and vti6 tunnels

Tue Jan 23 14:30:33 UTC 2024

Actually, we can further reduce the patch to the removal of
`.generate_mac = true`. This already fixes the issue we observe here.

** Patch added: "lp2037667.patch"
   https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2037667/+attachment/5741632/+files/lp2037667.patch

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Title:
  Regression on Jammy's kernel 5.15 when creating ip6gre and vti6
  tunnels

Status in linux package in Ubuntu:
  Confirmed
Status in systemd package in Ubuntu:
  Confirmed
Status in linux source package in Jammy:
  Triaged
Status in systemd source package in Jammy:
  New

Bug description:
  We noticed that some of Netplan's integration tests started to fail on
  Jammy. These tests will try to create ip6gre and vti6 virtual
  interfaces and systemd-networkd is failing to create them starting on
  kernel 5.15.0-83.92. As far as I can tell, kernel 5.15.0-82.91 is the
  last revision where it works. So, some change between 5.15.0-82.91 and
  5.15.0-83.92 is causing this regression.

  How to reproduce the issue:

  # Launch a jammy cloud VM:

  lxc launch images:ubuntu/jammy/cloud jammy --vm
  lxc shell jammy

  # Create a netplan file that creates 2 tunnels:

  cat > /etc/netplan/10-tun.yaml <<EOF
  network:
    renderer: networkd
    version: 2
    tunnels:
      tun0:
        mode: ip6gre
        local: fe80::1
        remote: 2001:dead:beef::2
      tun1:
        mode: vti6
        local: fe80::2
        remote: 2001:dead:beef::3
  EOF

  # Apply the configuration

  netplan apply

  # Check with "ip link" that both tun0 and tun1 *were not created* and
  check networkd for errors:

  journalctl -u systemd-networkd

  Sep 28 17:04:40 jammy systemd-networkd[360]: tun0: netdev could not be created: Invalid argument
  Sep 28 17:04:40 jammy systemd-networkd[360]: tun1: netdev could not be created: Invalid argument

  # Download, install and boot on kernel 5.15.0-82.91

  wget http://ie.archive.ubuntu.com/ubuntu/pool/main/l/linux-signed/linux-image-5.15.0-82-generic_5.15.0-82.91_amd64.deb http://ie.archive.ubuntu.com/ubuntu/pool/main/l/linux/linux-modules-5.15.0-82-generic_5.15.0-82.91_amd64.deb

  dpkg -i *.deb

  grub-reboot '1>2' && reboot

  # Check with "ip link" again that both tun0 and tun1 were created

  # Reboot again to go back to the most recent kernel and check with "ip link" that both tun0 and tun1 were not created.
  --- 
  ProblemType: Bug
  AlsaDevices:
   total 0
   crw-rw---- 1 root audio 116,  1 Sep 29 12:52 seq
   crw-rw---- 1 root audio 116, 33 Sep 29 12:52 timer
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay'
  ApportVersion: 2.20.11-0ubuntu82.5
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord'
  AudioDevicesInUse: Error: [Errno 2] No such file or directory: 'fuser'
  CRDA: N/A
  CasperMD5CheckResult: unknown
  CloudArchitecture: x86_64
  CloudID: lxd
  CloudName: lxd
  CloudPlatform: lxd
  CloudSubPlatform: LXD socket API v. 1.0 (/dev/lxd/sock)
  DistroRelease: Ubuntu 22.04
  IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig'
  Lspci: Error: [Errno 2] No such file or directory: 'lspci'
  Lspci-vt: Error: [Errno 2] No such file or directory: 'lspci'
  Lsusb: Error: [Errno 2] No such file or directory: 'lsusb'
  Lsusb-t: Error: [Errno 2] No such file or directory: 'lsusb'
  Lsusb-v: Error: [Errno 2] No such file or directory: 'lsusb'
  MachineType: QEMU Standard PC (Q35 + ICH9, 2009)
  Package: linux (not installed)
  PciMultimedia:

  ProcEnviron:
   TERM=screen-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 virtio_gpudrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.15.0-84-generic root=/dev/sda2 ro quiet splash console=tty1 console=ttyS0 vt.handoff=7
  ProcVersionSignature: Ubuntu 5.15.0-84.93-generic 5.15.116
  RelatedPackageVersions:
   linux-restricted-modules-5.15.0-84-generic N/A
   linux-backports-modules-5.15.0-84-generic  N/A
   linux-firmware                             N/A
  RfKill: Error: [Errno 2] No such file or directory: 'rfkill'
  Tags:  jammy uec-images
  Uname: Linux 5.15.0-84-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: N/A
  _MarkForUpload: True
  dmi.bios.date: 2/2/2022
  dmi.bios.release: 0.0
  dmi.bios.vendor: EDK II
  dmi.bios.version: unknown
  dmi.board.name: LXD
  dmi.board.vendor: Canonical Ltd.
  dmi.board.version: pc-q35-8.0
  dmi.chassis.type: 1
  dmi.chassis.vendor: QEMU
  dmi.chassis.version: pc-q35-8.0
  dmi.modalias: dmi:bvnEDKII:bvrunknown:bd2/2/2022:br0.0:svnQEMU:pnStandardPC(Q35+ICH9,2009):pvrpc-q35-8.0:rvnCanonicalLtd.:rnLXD:rvrpc-q35-8.0:cvnQEMU:ct1:cvrpc-q35-8.0:sku:
  dmi.product.name: Standard PC (Q35 + ICH9, 2009)
  dmi.product.version: pc-q35-8.0
  dmi.sys.vendor: QEMU

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