[Bug 1623068] Re: Networkd fails to configure a ethernet network device on a 3.4 kernel

[Martin Pitt]

Just to collect all the info, can you please re-run with

  sudo SYSTEMD_LOG_LEVEL=debug /lib/systemd/systemd-networkd

I assume this is a missing kernel feature (systemd only officially
supports kernels ≤ 2 years old), so we'd need some fallback. Can you
please step through with gdb and figure out which call fails in
particular? I don't immediately see where this comes from --
readlinkat() is only called in some wrapper functions in src/basic/fs-
util.c and copy_tree_at, neither of which are being called by networkd.
So I sugguest to build a debug version with CFLAGS="-g -O0" (from
upstream or the Debian package) and gdb through networkd.

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https://bugs.launchpad.net/bugs/1623068

Title:
  Networkd fails to configure a ethernet network device on a 3.4 kernel

Status in systemd package in Ubuntu:
  Confirmed

Bug description:
  Knowing that a 3.4 based kernel is unsupported we have to get it
  working for a specific customer.

  Systemd itself boots up nicely already but networkd fails to configure
  a network device with the following configuration file in
  /etc/systemd/network

  $ cat /etc/systemd/network/enp1s0.network 
  [Match]
  Name=enp1s0

  [Network]
  DNS=8.8.8.8
  Address=192.168.178.30
  Gateway=192.168.178.1

  This gives the following error messages

  $ sudo /lib/systemd/systemd-networkd
  Enumeration completed
  enp1s0: Could not bring up interface: Invalid argument
  enp1s0: Could not set route: Invalid argument

  ifupdown or NetworkManager is reliable able to get the same interface
  up and configured.

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