[Bug 1832050] Re: chrony autopkgtest "time-sources-from-dhcp-servers" fails (produces stderr)

[Balint Reczey]

*** This bug is a duplicate of bug 1805183 ***
    https://bugs.launchpad.net/bugs/1805183

** This bug has been marked a duplicate of bug 1805183
   systemd-resolved constantly restarts on Bionic upgraded from Xenial

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Title:
  chrony autopkgtest "time-sources-from-dhcp-servers" fails (produces
  stderr)

Status in systemd package in Ubuntu:
  Confirmed
Status in systemd source package in Eoan:
  Confirmed

Bug description:
  iproute2 fix in -proposed
  (https://launchpad.net/ubuntu/+source/iproute2/4.18.0-1ubuntu3) has
  showed regressions in chrony autopkgtest (object of this bug report).

  From autopkgtest output:

  """
  Generating /etc/default/isc-dhcp-server...
  Created symlink /etc/systemd/system/multi-user.target.wants/isc-dhcp-server.service → /lib/systemd/system/isc-dhcp-server.service.
  Created symlink /etc/systemd/system/multi-user.target.wants/isc-dhcp-server6.service → /lib/systemd/system/isc-dhcp-server6.service.
  Setting up autopkgtest-satdep (0) ...
  Processing triggers for systemd (240-6ubuntu9) ...
  Processing triggers for man-db (2.8.5-2) ...
  Processing triggers for libc-bin (2.29-0ubuntu2) ...
  (Reading database ... 62774 files and directories currently installed.)
  Removing autopkgtest-satdep (0) ...
  autopkgtest [20:50:33]: test time-sources-from-dhcp-servers: [-----------------------
  Preparing the dummy network interface and dhcpd configuration…
  md5sum: /run/systemd/resolved.conf.d/isc-dhcp-v4-dummy0.conf: No such file or directory
  md5sum: /run/systemd/resolved.conf.d/isc-dhcp-v6-dummy0.conf: No such file or directory
  md5sum: /run/systemd/resolved.conf.d/isc-dhcp-v4-dummy0.conf: No such file or directory
  md5sum: /run/systemd/resolved.conf.d/isc-dhcp-v6-dummy0.conf: No such file or directory
  Done!

  Check if the NTP server is made available to chronyd…
  SUCCESS!

  Release the current lease and check if the NTP server has been correctly removed…
  SUCCESS!
  """

  It is likely that the stdout from md5sum coming out of the dhclient
  command caused the "regression".

  I have reproduced the issue by hand doing:

  $ apt-get install isc-dhcp-server
  $ modprobe dummy

  $ ip link add name dummy0 type dummy
  $ ip address add 192.168.1.1/24 dev dummy0
  $ ip link set dev dummy0 up

  cat <<EOF > /etc/dhcp/dhcpd.conf
  default-lease-time 600;
  max-lease-time 7200;
  authorative;

  subnet 192.168.1.0 netmask 255.255.255.0 {
      option subnet-mask              255.255.255.0;
      option broadcast-address        192.168.1.255;
      option ntp-servers              192.168.1.50;
      range 192.168.1.42 192.168.1.100;
  }
  EOF

  $ sed -i 's/INTERFACESv4=""/INTERFACESv4="dummy0"/' /etc/default/isc-
  dhcp-server

  and

  $ systemctl restart isc-dhcp-server

  $ dhclient dummy0 <- problem happens here

  It could be a "isc-dhcp-client"problem, but I'll keep this bug linked
  to another bug if that is the case.

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