Bug#819414: systemd: networkd keeps going idle, then starting up again

[Daniel Schaal]

Package: systemd
Version: 229-3
Severity: normal

networkd keeps going idle, then starting up when a Router Advertisement is received,
leading it to reconfigure the network

I get this in the journal about every 10 minutes or so:

dhcpcd[956]: enp2s0: Router Advertisement from fe80::xxxx:xxxx:xxxx:xxxx
systemd[1]: Starting Network Service...
systemd-networkd[1978]: br0: netdev ready
systemd-networkd[1978]: br0: Gained IPv6LL
systemd-networkd[1978]: wlp4s0: Gained IPv6LL
systemd-networkd[1978]: enp2s0: Gained IPv6LL
systemd-networkd[1978]: Enumeration completed
systemd[1]: Started Network Service.
systemd-timesyncd[460]: Network configuration changed, trying to establish connection.
systemd-networkd[1978]: br0: netdev exists, using existing without changing its parameters
systemd-timesyncd[460]: Synchronized to time server xxx.xxx.xxx.xxx:123 (hostname).
systemd-timesyncd[460]: Network configuration changed, trying to establish connection.
systemd-timesyncd[460]: Synchronized to time server xxx.xxx.xxx.xxx:123 (hostname).
systemd-timesyncd[460]: Network configuration changed, trying to establish connection.

This seems related to the upstream bug #2577 [1], which is fixed by commit 9dc907f9 [2]

After building a package with this commit backported, I can confirm that it fixes the
problem and networkd stays running and doesn't reconfigure the network when a RA is
received.

Thanks,
Daniel

[1] https://github.com/systemd/systemd/issues/2577
[2] https://github.com/systemd/systemd/commit/9dc907f9

-- Package-specific info:

-- System Information:
Debian Release: stretch/sid
  APT prefers unstable
  APT policy: (500, 'unstable'), (103, 'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 4.5.0-trunk-amd64 (SMP w/4 CPU cores)
Locale: LANG=de_DE.UTF-8, LC_CTYPE=de_DE.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/bash
Init: systemd (via /run/systemd/system)

Versions of packages systemd depends on:
ii  adduser         3.114
ii  libacl1         2.2.52-3
ii  libapparmor1    2.10-3+b1
ii  libaudit1       1:2.4.5-1+b1
ii  libblkid1       2.27.1-6
ii  libc6           2.22-4
ii  libcap2         1:2.24-12
ii  libcap2-bin     1:2.24-12
ii  libcryptsetup4  2:1.7.0-2
ii  libgcrypt20     1.6.5-2
ii  libgpg-error0   1.21-2
ii  libkmod2        22-1
ii  liblzma5        5.1.1alpha+20120614-2.1
ii  libmount1       2.27.1-6
ii  libpam0g        1.1.8-3.2
ii  libseccomp2     2.2.3-3
ii  libselinux1     2.4-3+b1
ii  libsystemd0     229-3
ii  mount           2.27.1-6
ii  util-linux      2.27.1-6

Versions of packages systemd recommends:
ii  dbus            1.10.8-1
ii  libpam-systemd  229-3

Versions of packages systemd suggests:
pn  systemd-container  <none>
pn  systemd-ui         <none>

Versions of packages systemd is related to:
ii  udev  229-3

-- no debconf information