I verified that applying commit 223932c786ada7f758a7b7878a6ad2dae0d1e5fb from https://github.com/systemd/systemd/pull/8728 on top of systemd 237-3ubuntu10.9 solves this bug.
Therefore please include the patch in systemd for Ubuntu 18.04. ** Description changed: - root cause in systemd bug: - https://github.com/systemd/systemd/issues/3752 + root cause in systemd bug fixed in Commit 223932c786ada7f758a7b7878a6ad2dae0d1e5fb: + https://github.com/systemd/systemd/pull/8728 Environment: Ubuntu 18.04 LTS amd64 systemd package version 237-3ubuntu10.9 How to trigger: 1. add netplan interface with dhcpv4 client enabled: - enp0s8: - addresses: [] - dhcp4: true + enp0s8: + addresses: [] + dhcp4: true 2. configure dhcp server to NOT give a default route, or any route for that matter 3. reboot 4. systemd-networkd-wait-online will block until dhcp renew is triggered root@sensor1:~# /lib/systemd/systemd-networkd-wait-online --timeout=3 Event loop failed: Connection timed out root@sensor1:~# /lib/systemd/systemd-networkd-wait-online --timeout=3 --ignore=enp0s8 managing: enp0s3 ignoring: lo ignoring: enp0s8 How to fix: Backport upstream changes from systemd (see related systemd ticket). ** Description changed: - root cause in systemd bug fixed in Commit 223932c786ada7f758a7b7878a6ad2dae0d1e5fb: + root cause in systemd bug fixed in Commit + 223932c786ada7f758a7b7878a6ad2dae0d1e5fb: https://github.com/systemd/systemd/pull/8728 Environment: Ubuntu 18.04 LTS amd64 systemd package version 237-3ubuntu10.9 How to trigger: 1. add netplan interface with dhcpv4 client enabled: enp0s8: addresses: [] dhcp4: true 2. configure dhcp server to NOT give a default route, or any route for that matter 3. reboot 4. systemd-networkd-wait-online will block until dhcp renew is triggered root@sensor1:~# /lib/systemd/systemd-networkd-wait-online --timeout=3 Event loop failed: Connection timed out root@sensor1:~# /lib/systemd/systemd-networkd-wait-online --timeout=3 --ignore=enp0s8 managing: enp0s3 ignoring: lo ignoring: enp0s8 How to fix: Backport upstream changes from systemd (see related systemd ticket). ** Changed in: systemd (Ubuntu) Status: Confirmed => Triaged -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to systemd in Ubuntu. https://bugs.launchpad.net/bugs/1804478 Title: netplan dhcp interface with no default route causes systemd-networkd- wait-online to hang Status in systemd: Fix Released Status in systemd package in Ubuntu: Triaged Bug description: root cause in systemd bug fixed in Commit 223932c786ada7f758a7b7878a6ad2dae0d1e5fb: https://github.com/systemd/systemd/pull/8728 Environment: Ubuntu 18.04 LTS amd64 systemd package version 237-3ubuntu10.9 How to trigger: 1. add netplan interface with dhcpv4 client enabled: enp0s8: addresses: [] dhcp4: true 2. configure dhcp server to NOT give a default route, or any route for that matter 3. reboot 4. systemd-networkd-wait-online will block until dhcp renew is triggered root@sensor1:~# /lib/systemd/systemd-networkd-wait-online --timeout=3 Event loop failed: Connection timed out root@sensor1:~# /lib/systemd/systemd-networkd-wait-online --timeout=3 --ignore=enp0s8 managing: enp0s3 ignoring: lo ignoring: enp0s8 How to fix: Backport upstream changes from systemd (see related systemd ticket). To manage notifications about this bug go to: https://bugs.launchpad.net/systemd/+bug/1804478/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
