[Bug 1929774] [NEW] do-release-upgrade hangs when systemd-networkd.service fails to restart cleanly; causes sshd issues

[Zachary Zehring]

Public bug reported:

We upgraded some baremetal machines from bionic to focal. During the
d-r-u process, it got stuck when it tried to restart systemd-
networkd.service [0]. This also caused the machine to be unreachable
through ssh. The only way to work around this issue was to have an
existing ssh session on the machine during the upgrade. Then, I was able
to restart systemd-networkd.socket and systemd-networkd.service to get
things working again; this unstuck the d-r-u process. Additionally, I
had to restart sshd for that service to work as well. Other services
listening on other ports worked fine. This was a juju unit, and "juju
run --machine $num" worked to issue commands remotely on the machine.

[0]
Created symlink /etc/systemd/system/sysinit.target.wants/systemd-pstore.service  /lib/systemd/system/systemd-pstore.service.
Job for systemd-networkd.service failed because the control process exited with error code.
See "systemctl status systemd-networkd.service" and "journalctl -xe" for details.

** Affects: ubuntu-release-upgrader (Ubuntu)
     Importance: Undecided
         Status: New

** Description changed:

  We upgraded some baremetal machines from bionic to focal. During the
  d-r-u process, it got stuck when it tried to restart systemd-
  networkd.service [0]. This also caused the machine to be unreachable
- through ssh. The only way to avoid this issue was to have an existing
- ssh session on the machine during the upgrade. Then, I was able to
- restart systemd-networkd.socket and systemd-networkd.service to get
+ through ssh. The only way to work around this issue was to have an
+ existing ssh session on the machine during the upgrade. Then, I was able
+ to restart systemd-networkd.socket and systemd-networkd.service to get
  things working again; this unstuck the d-r-u process. Additionally, I
  had to restart sshd for that service to work as well. Other services
  listening on other ports worked fine as well. This was a juju unit, and
  "juju run --machine $num" worked to issue commands remotely on the
  machine.
  
- [0] 
+ [0]
  Created symlink /etc/systemd/system/sysinit.target.wants/systemd-pstore.service  /lib/systemd/system/systemd-pstore.service.
  Job for systemd-networkd.service failed because the control process exited with error code.
  See "systemctl status systemd-networkd.service" and "journalctl -xe" for details.

** Description changed:

  We upgraded some baremetal machines from bionic to focal. During the
  d-r-u process, it got stuck when it tried to restart systemd-
  networkd.service [0]. This also caused the machine to be unreachable
  through ssh. The only way to work around this issue was to have an
  existing ssh session on the machine during the upgrade. Then, I was able
  to restart systemd-networkd.socket and systemd-networkd.service to get
  things working again; this unstuck the d-r-u process. Additionally, I
  had to restart sshd for that service to work as well. Other services
- listening on other ports worked fine as well. This was a juju unit, and
- "juju run --machine $num" worked to issue commands remotely on the
- machine.
+ listening on other ports worked fine. This was a juju unit, and "juju
+ run --machine $num" worked to issue commands remotely on the machine.
  
  [0]
  Created symlink /etc/systemd/system/sysinit.target.wants/systemd-pstore.service  /lib/systemd/system/systemd-pstore.service.
  Job for systemd-networkd.service failed because the control process exited with error code.
  See "systemctl status systemd-networkd.service" and "journalctl -xe" for details.

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https://bugs.launchpad.net/bugs/1929774

Title:
  do-release-upgrade hangs when systemd-networkd.service fails to
  restart cleanly; causes sshd issues

Status in ubuntu-release-upgrader package in Ubuntu:
  New

Bug description:
  We upgraded some baremetal machines from bionic to focal. During the
  d-r-u process, it got stuck when it tried to restart systemd-
  networkd.service [0]. This also caused the machine to be unreachable
  through ssh. The only way to work around this issue was to have an
  existing ssh session on the machine during the upgrade. Then, I was
  able to restart systemd-networkd.socket and systemd-networkd.service
  to get things working again; this unstuck the d-r-u process.
  Additionally, I had to restart sshd for that service to work as well.
  Other services listening on other ports worked fine. This was a juju
  unit, and "juju run --machine $num" worked to issue commands remotely
  on the machine.

  [0]
  Created symlink /etc/systemd/system/sysinit.target.wants/systemd-pstore.service  /lib/systemd/system/systemd-pstore.service.
  Job for systemd-networkd.service failed because the control process exited with error code.
  See "systemctl status systemd-networkd.service" and "journalctl -xe" for details.

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