[Bug 1999178] Re: netplan generator causes deadlock during systemd daemon-reload

[Lukas Märdian]

"generate" is not calling "udevadm control --reload" anymore, as
discussed in https://github.com/canonical/netplan/pull/488

Fixed in the 1.0.1-1ubuntu2~24.04.1 SRU for Noble (LP: #2074197)

** Changed in: netplan.io (Ubuntu Noble)
       Status: Confirmed => Fix Released

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https://bugs.launchpad.net/bugs/1999178

Title:
  netplan generator causes deadlock during systemd daemon-reload

Status in Netplan:
  Fix Released
Status in netplan.io package in Ubuntu:
  Fix Released
Status in netplan.io source package in Noble:
  Fix Released
Status in netplan.io source package in Oracular:
  Fix Released

Bug description:
  From the issue in the systemd tracker [1]:

  During a systemd daemon-reload, the Netplan generator in
  /usr/lib/systemd/system-generators/netplan tries to reload the udev
  rules and databases with udevadm control --reload [2], which causes a
  deadlock, because reloading udev rules and databases requires a
  functioning systemd-userdbd.service, which is not the case during a
  systemd daemon-reload. The systemd developers will not consider making
  changes to any systemd component in order to prevent this deadlock,
  and instead suggest that the Netplan developers generate their systemd
  link/network/netdev units using a generator service like systemd-
  network-generator.service.

  [1] https://github.com/systemd/systemd/issues/25543
  [2] https://github.com/canonical/netplan/blob/bf8036d43837bc071d1d3f716f67dc24ef5a5b23/src/generate.c#L54

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