[Bug 1877176] Autopkgtest regression report (systemd/229-4ubuntu21.29)

[Ubuntu SRU Bot]

All autopkgtests for the newly accepted systemd (229-4ubuntu21.29) for xenial have finished running.
The following regressions have been reported in tests triggered by the package:

systemd/229-4ubuntu21.29 (i386, amd64)


Please visit the excuses page listed below and investigate the failures, proceeding afterwards as per the StableReleaseUpdates policy regarding autopkgtest regressions [1].

https://people.canonical.com/~ubuntu-archive/proposed-
migration/xenial/update_excuses.html#systemd

[1] https://wiki.ubuntu.com/StableReleaseUpdates#Autopkgtest_Regressions

Thank you!

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https://bugs.launchpad.net/bugs/1877176

Title:
  64-char hostname causes dhcp server to reject lease

Status in systemd package in Ubuntu:
  Fix Released
Status in systemd source package in Xenial:
  Fix Committed

Bug description:
  [impact]

  a systemd with a 64-character hostname (the maximum hostname length
  for Linux) will cause a dhcp server to reject its dhcp lease due to
  passing the invalid hostname in the dhcp lease request.

  [test case]

  $ cat /etc/systemd/network/10-ens3.network
  [Match]
  Name=ens3

  [Network]
  DHCP=yes

  set hostname to 64-char name, e.g.:

  $ sudo hostnamectl set-hostname
  a123456789b123456789c123456789d123456789e123456789f123456789g123

  restart networkd:

  $ sudo systemctl restart systemd-networkd

  check logs:

  root at a123456789b123456789c123456789d123456789e123456789f123456789g123:~# journalctl -b -u systemd-networkd --no-pager | grep 'DHCP error'
  May 06 19:01:30 a123456789b123456789c123456789d123456789e123456789f123456789g123 systemd-networkd[737]: ens3: DHCP error: Client failed: Invalid argument

  [regression potential]

  Any regression would likely result in failure configuring/processing
  dhcpv4 server response, or rejection from the dhcpv4 server.

  [scope]

  this is fixed by commit 9740eae694e93b06658ff3b3045b22b591561e7c which
  is included in Bionic and later.  This is needed only for Xenial.

  [other info]

  this is a follow on to bug 1862232, which corrected sd-dhcp-client.c
  to continue networkd dhcp even if the hostname is invalid, however the
  older code in Xenial doesn't correctly detect the invalid hostname, so
  this additional patch is needed.

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