[Bug 1891716] Re: Networking broken after systemd update

[Balint Reczey]

Since this affects only upgrades from pre-246 versions the severity
should be High only. I'm testing the fix in Bileto and will upload it if
the tests found no regression:

https://bileto.ubuntu.com/#/ticket/3801


** Changed in: systemd (Ubuntu)
   Importance: Critical => High

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Title:
  Networking broken after systemd update

Status in systemd package in Ubuntu:
  In Progress
Status in systemd package in Debian:
  Unknown

Bug description:
  # Description:

  After this upgrade in groovy, networking stopped working:

  Start-Date: 2020-08-14  17:02:50
  Commandline: apt-get dist-upgrade --assume-yes
  Requested-By: ubuntu (1000)
  Install: motd-news-config:amd64 (11ubuntu11, automatic)
  Upgrade: libaudit-common:amd64 (1:2.8.5-2ubuntu6, 1:2.8.5-3ubuntu1), alsa-ucm-conf:amd64 (1.2.2-1ubuntu1, 1.2.2-1ubuntu2), libmpfr6:amd64 (4.0.2-1build1, 4.1.0-3), python3-software-properties:amd64 (0.98.10, 0.99.2), cloud-initramfs-dyn-netconf:amd64 (0.45ubuntu1, 0.46ubuntu1), libsystemd0:amd64 (245.7-1ubuntu1, 246-2ubuntu1), libpam-cap:amd64 (1:2.36-1, 1:2.42-2), libgmp10:amd64 (2:6.2.0+dfsg-6, 2:6.2.0+dfsg-6ubuntu1), ubuntu-standard:amd64 (1.452, 1.453), nano:amd64 (4.9.3-1, 5.1-1), udev:amd64 (245.7-1ubuntu1, 246-2ubuntu1), ubuntu-server:amd64 (1.452, 1.453), libpipeline1:amd64 (1.5.2-2build1, 1.5.3-1), isc-dhcp-common:amd64 (4.4.1-2.1ubuntu6, 4.4.1-2.1ubuntu9), libudev1:amd64 (245.7-1ubuntu1, 246-2ubuntu1), systemd-timesyncd:amd64 (245.7-1ubuntu1, 246-2ubuntu1), ubuntu-minimal:amd64 (1.452, 1.453), libcap2:amd64 (1:2.36-1, 1:2.42-2), systemd-sysv:amd64 (245.7-1ubuntu1, 246-2ubuntu1), libcap2-bin:amd64 (1:2.36-1, 1:2.42-2), libpam-systemd:amd64 (245.7-1ubuntu1, 246-2ubuntu1), systemd:amd64 (245.7-1ubuntu1, 246-2ubuntu1), libnss-systemd:amd64 (245.7-1ubuntu1, 246-2ubuntu1), ethtool:amd64 (1:5.4-1, 1:5.8-1), overlayroot:amd64 (0.45ubuntu1, 0.46ubuntu1), cloud-initramfs-copymods:amd64 (0.45ubuntu1, 0.46ubuntu1), isc-dhcp-client:amd64 (4.4.1-2.1ubuntu6, 4.4.1-2.1ubuntu9), libaudit1:amd64 (1:2.8.5-2ubuntu6, 1:2.8.5-3ubuntu1), base-files:amd64 (11ubuntu10, 11ubuntu11), software-properties-common:amd64 (0.98.10, 0.99.2)
  End-Date: 2020-08-14  17:03:10

  # Reproduction steps:

  $ multipass launch --name groovy-update-test daily:groovy
  $ multipass connect groovy-update-test
  # connected to VM
  $ sudo apt-get update && sudo apt-get dist-upgrade --assume-yes
  # works fine
  $ sudo apt-get update
  Err:1 http://security.ubuntu.com/ubuntu groovy-security InRelease
    Temporary failure resolving 'security.ubuntu.com'
  Err:2 http://archive.ubuntu.com/ubuntu groovy InRelease
    Temporary failure resolving 'archive.ubuntu.com'
  Err:3 http://archive.ubuntu.com/ubuntu groovy-updates InRelease
    Temporary failure resolving 'archive.ubuntu.com'
  Err:4 http://archive.ubuntu.com/ubuntu groovy-backports InRelease
    Temporary failure resolving 'archive.ubuntu.com'
  Reading package lists... Done
  W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/groovy/InRelease  Temporary failure resolving 'archive.ubuntu.com'
  W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/groovy-updates/InRelease  Temporary failure resolving 'archive.ubuntu.com'
  W: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/groovy-backports/InRelease  Temporary failure resolving 'archive.ubuntu.com'
  W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/groovy-security/InRelease  Temporary failure resolving 'security.ubuntu.com'
  W: Some index files failed to download. They have been ignored, or old ones used instead.

  $ sudo systemctl list-units --failed
    UNIT                     LOAD   ACTIVE SUB    DESCRIPTION
  ● systemd-networkd.service loaded failed failed Network Service
  ● systemd-networkd.socket  loaded failed failed Network Service Netlink Socket

  LOAD   = Reflects whether the unit definition was properly loaded.
  ACTIVE = The high-level unit activation state, i.e. generalization of SUB.
  SUB    = The low-level unit activation state, values depend on unit type.

  2 loaded units listed.
  $ systemctl status systemd-networkd.service
  ● systemd-networkd.service - Network Service
       Loaded: loaded (/lib/systemd/system/systemd-networkd.service; enabled; vendor preset: enabled)
       Active: failed (Result: exit-code) since Fri 2020-08-14 17:03:01 EDT; 12min ago
  TriggeredBy: ● systemd-networkd.socket
         Docs: man:systemd-networkd.service(8)
     Main PID: 2745 (code=exited, status=1/FAILURE)

  Aug 14 17:03:01 fulfilling-hornet systemd[1]: systemd-networkd.service: Main process exited, code=exited, status=1/FAILURE
  Aug 14 17:03:01 fulfilling-hornet systemd[1]: systemd-networkd.service: Failed with result 'exit-code'.
  Aug 14 17:03:01 fulfilling-hornet systemd[1]: Failed to start Network Service.
  Aug 14 17:03:01 fulfilling-hornet systemd[1]: systemd-networkd.service: Scheduled restart job, restart counter is at 5.
  Aug 14 17:03:01 fulfilling-hornet systemd[1]: Stopped Network Service.
  Aug 14 17:03:01 fulfilling-hornet systemd[1]: systemd-networkd.service: Start request repeated too quickly.
  Aug 14 17:03:01 fulfilling-hornet systemd[1]: systemd-networkd.service: Failed with result 'exit-code'.
  Aug 14 17:03:01 fulfilling-hornet systemd[1]: Failed to start Network Service.

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