Public bug reported:
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.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: Incomplete
** Affects: linux (Ubuntu Jammy)
Importance: Undecided
Status: Incomplete
** Also affects: linux (Ubuntu Jammy)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/2037667
Title:
Regression on Jammy's kernel 5.15 when creating ip6gre and vti6
tunnels
Status in linux package in Ubuntu:
Incomplete
Status in linux source package in Jammy:
Incomplete
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.
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