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[Launchpad Bug Tracker <1877176@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package systemd - 229-4ubuntu21.29

---------------
systemd (229-4ubuntu21.29) xenial; urgency=medium

  [ Dan Streetman ]
  * d/p/lp1881312/0001-core-don-t-dispatch-load-queue-when-setting-Slice-fo.patch,
    d/p/lp1881312/0002-run-make-slice-work-in-conjunction-with-scope.patch:
    - run new scope unit in specified slice (LP: #1881312)
    https://git.launchpad.net/~ubuntu-core-dev/ubuntu/+source/systemd/commit/?id=b5a778c3cd93e3d684602146f281f315f30778a8
  * d/p/lp1877176-sd-dhcp-client-validate-hostnames-stricter-7308.patch:
    - strictly validate hostname sent to dhcp server (LP: #1877176)
    https://git.launchpad.net/~ubuntu-core-dev/ubuntu/+source/systemd/commit/?id=7a1f1c41dcd860fcba6be42a2153cfe4315ebf17
  * d/e/rules-ubuntu/40-vm-hotadd.rules:
    - Hotadd only offline memory and CPUs
      (LP: #1876018)
    https://git.launchpad.net/~ubuntu-core-dev/ubuntu/+source/systemd/commit/?id=43357bd260a1c3e7b4951d33cbacaebda1d086b3
  * d/p/lp1698388-journal-remote-Ensure-reallocation-of-source-buf-doe.patch:
    - Fix assertion failure when journald source->filled < source->size
      (LP: #1698388)
    https://git.launchpad.net/~ubuntu-core-dev/ubuntu/+source/systemd/commit/?id=d1cc15b88113510227e5a76654e103ef54a8b8f3

  [ Heitor Alves de Siqueira ]
  * d/p/lp1876600-sd-bus-deal-with-cookie-overruns.patch:
    - deal with dbus cookie overruns (LP: #1876600)
    https://git.launchpad.net/~ubuntu-core-dev/ubuntu/+source/systemd/commit/?id=8dc9ef188944349169044d8974a4ffa55c66be9d

 -- Heitor Alves de Siqueira <halves@xxxxxxxxxxxxx>  Tue, 07 Jul 2020
17:28:11 -0400

** Changed in: systemd (Ubuntu Xenial)
       Status: Fix Committed => Fix Released

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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 Released

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@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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