[Bug 1839231] Re: updating bionic to 237-3ubuntu10.25 restarts systemd-networkd

[Dan Streetman]

upgrading systemd does restart networkd, but it should not remove any
existing managed configuration while restarting (or stopping).  For
example:

ubuntu at lp1839231:~$ sudo systemctl start systemd-networkd
ubuntu at lp1839231:~$ ip a show ens3
2: ens3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
    link/ether 52:54:00:e8:e2:3f brd ff:ff:ff:ff:ff:ff
    inet 192.168.122.25/24 brd 192.168.122.255 scope global dynamic ens3
       valid_lft 3537sec preferred_lft 3537sec
    inet6 fe80::5054:ff:fee8:e23f/64 scope link 
       valid_lft forever preferred_lft forever
ubuntu at lp1839231:~$ sudo systemctl stop systemd-networkd
Warning: Stopping systemd-networkd.service, but it can still be activated by:
  systemd-networkd.socket
ubuntu at lp1839231:~$ ip a show ens3
2: ens3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
    link/ether 52:54:00:e8:e2:3f brd ff:ff:ff:ff:ff:ff
    inet 192.168.122.25/24 brd 192.168.122.255 scope global dynamic ens3
       valid_lft 3529sec preferred_lft 3529sec
    inet6 fe80::5054:ff:fee8:e23f/64 scope link 
       valid_lft forever preferred_lft forever
ubuntu at lp1839231:~$ sudo systemctl start systemd-networkd
ubuntu at lp1839231:~$ ip a show ens3
2: ens3: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
    link/ether 52:54:00:e8:e2:3f brd ff:ff:ff:ff:ff:ff
    inet 192.168.122.25/24 brd 192.168.122.255 scope global dynamic ens3
       valid_lft 3599sec preferred_lft 3599sec
    inet6 fe80::5054:ff:fee8:e23f/64 scope link 
       valid_lft forever preferred_lft forever


What specific config is in your networkd config files?  What specific interface(s) or address(es) are you having trouble with?

** Changed in: systemd (Ubuntu)
       Status: New => Incomplete

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Title:
  updating bionic to 237-3ubuntu10.25 restarts systemd-networkd

Status in systemd package in Ubuntu:
  Incomplete

Bug description:
  I updated my Ubuntu 18.04.2 server from systemd 237-3ubuntu10.24 to
  237-3ubuntu10.25. This caused a restart of systemd-networkd, breaking
  all TCP-over-IPv6 connections.

  apt history entry:

  Start-Date: 2019-08-06  19:46:21
  Commandline: apt-get dist-upgrade -y
  Requested-By: shivaram (1000)
  Upgrade: libsystemd0:amd64 (237-3ubuntu10.24, 237-3ubuntu10.25), udev:amd64 (237-3ubuntu10.24, 237-3ubuntu10.25), libudev1:amd64 (237-3ubuntu10.24, 237-3ubuntu10.25), systemd-sysv:amd64 (237-3ubuntu10.24, 237-3ubuntu10.25), libpam-systemd:amd64 (237-3ubuntu10.24, 237-3ubuntu10.25), systemd:amd64 (237-3ubuntu10.24, 237-3ubuntu10.25), libnss-systemd:amd64 (237-3ubuntu10.24, 237-3ubuntu10.25), base-files:amd64 (10.1ubuntu2.5, 10.1ubuntu2.6)
  End-Date: 2019-08-06  19:54:17

  systemd journal output:

  Aug 06 19:47:40 pentos systemd[1]: Reloading.
  Aug 06 19:47:57 pentos systemd[1]: Reexecuting.
  Aug 06 19:47:58 pentos systemd[1]: systemd 237 running in system mode. (+PAM +AUDIT +SELINUX +IMA +APPARMOR +SMACK +SYSVINIT +UTMP +LIBCRYPTSETUP +GCRYPT +GNUTLS +ACL +XZ +LZ4 +SECCOMP +BLKID +ELFUTILS +KMOD -IDN2 +IDN -PCRE2 default-hie
  Aug 06 19:47:58 pentos systemd[1]: Detected architecture x86-64.
  Aug 06 19:47:58 pentos systemd[1]: Stopping Network Service...
  Aug 06 19:47:58 pentos systemd[1]: Stopped Network Service.
  Aug 06 19:47:58 pentos systemd[1]: Starting Network Service...
  Aug 06 19:47:59 pentos systemd-networkd[11513]: ens5: Gained IPv6LL
  Aug 06 19:47:59 pentos systemd-networkd[11513]: Enumeration completed
  Aug 06 19:47:59 pentos systemd[1]: Started Network Service.
  Aug 06 19:47:59 pentos systemd-networkd[11513]: lo: Link is not managed by us
  Aug 06 19:47:59 pentos systemd-networkd[11513]: ens5: DHCPv4 address 192.168.1.103/24 via 192.168.1.1
  Aug 06 19:47:59 pentos dbus-daemon[947]: [system] Activating via systemd: service name='org.freedesktop.hostname1' unit='dbus-org.freedesktop.hostname1.service' requested by ':1.2341' (uid=100 pid=11513 comm="/lib/systemd/systemd-network
  Aug 06 19:47:59 pentos systemd-networkd[11513]: ens5: Configured

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