[Bug 1826387] Re: systemd-networkd restart brings down bond slaves

[Dan Streetman]

*** This bug is a duplicate of bug 1833671 ***
    https://bugs.launchpad.net/bugs/1833671

** This bug has been marked a duplicate of bug 1833671
   bond interfaces stop working after restart of systemd-networkd

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https://bugs.launchpad.net/bugs/1826387

Title:
  systemd-networkd restart brings down bond slaves

Status in systemd:
  Fix Released
Status in systemd package in Ubuntu:
  Fix Released
Status in systemd source package in Bionic:
  New
Status in systemd source package in Cosmic:
  Won't Fix

Bug description:
  Reported upstream as https://github.com/systemd/systemd/issues/10118

  Ubuntu bionic, systemd version 237-3ubuntu10.19

  When systemd-networkd is used to manage network bonds, upon systemd-
  networkd, bonds are brought down for ~10 seconds affecting
  connectivity to the server. From networkd logs (truncated to:

  ```
  # journalctl -b -u systemd-networkd | grep enp3s0f
  Apr 25 12:45:33 compute01 systemd-networkd[30824]: Ignoring /etc/systemd/network/01-enp3s0f1.network, because it's not a regular file with suffix .netdev.
  Apr 25 12:45:33 compute01 systemd-networkd[30824]: Ignoring /etc/systemd/network/00-enp3s0f0.network, because it's not a regular file with suffix .netdev.
  Apr 25 12:45:33 compute01 systemd-networkd[30824]: enp3s0f1: Flags change: +SLAVE +UP +LOWER_UP +RUNNING +MULTICAST +BROADCAST
  Apr 25 12:45:33 compute01 systemd-networkd[30824]: enp3s0f1: Link 6 added
  Apr 25 12:45:33 compute01 systemd-networkd[30824]: enp3s0f1: udev initialized link
  Apr 25 12:45:33 compute01 systemd-networkd[30824]: enp3s0f1: Saved original MTU: 9000
  Apr 25 12:45:33 compute01 systemd-networkd[30824]: enp3s0f0: Flags change: +SLAVE +UP +LOWER_UP +RUNNING +MULTICAST +BROADCAST
  Apr 25 12:45:33 compute01 systemd-networkd[30824]: enp3s0f0: Link 3 added
  Apr 25 12:45:33 compute01 systemd-networkd[30824]: enp3s0f0: udev initialized link
  Apr 25 12:45:33 compute01 systemd-networkd[30824]: enp3s0f0: Saved original MTU: 9000
  Apr 25 12:45:33 compute01 systemd-networkd[30824]: enp3s0f0: Link is not managed by us
  Apr 25 12:45:33 compute01 systemd-networkd[30824]: enp3s0f1: Link is not managed by us
  Apr 25 12:45:33 compute01 systemd-networkd[30824]: enp3s0f0: Link is not managed by us
  Apr 25 12:45:33 compute01 systemd-networkd[30824]: enp3s0f1: Link is not managed by us
  Apr 25 12:45:33 compute01 systemd-networkd[30824]: enp3s0f0: Link is not managed by us
  Apr 25 12:45:33 compute01 systemd-networkd[30824]: enp3s0f1: Link is not managed by us
  Apr 25 12:45:33 compute01 systemd-networkd[30824]: enp3s0f0: Link is not managed by us
  Apr 25 12:45:33 compute01 systemd-networkd[30824]: enp3s0f1: Link is not managed by us
  Apr 25 12:45:33 compute01 systemd-networkd[30824]: enp3s0f0: Link is not managed by us
  Apr 25 12:45:33 compute01 systemd-networkd[30824]: enp3s0f1: Link is not managed by us
  Apr 25 12:45:33 compute01 systemd-networkd[30824]: enp3s0f0: Link is not managed by us
  Apr 25 12:45:33 compute01 systemd-networkd[30824]: enp3s0f1: Link is not managed by us
  Apr 25 12:45:33 compute01 systemd-networkd[30824]: enp3s0f0: Link is not managed by us
  Apr 25 12:45:33 compute01 systemd-networkd[30824]: enp3s0f1: Link is not managed by us
  Apr 25 12:45:33 compute01 systemd-networkd[30824]: enp3s0f1: Link state is up-to-date
  Apr 25 12:45:33 compute01 systemd-networkd[30824]: enp3s0f1: found matching network '/etc/systemd/network/01-enp3s0f1.network'
  Apr 25 12:45:33 compute01 systemd-networkd[30824]: enp3s0f0: Link is not managed by us
  Apr 25 12:45:33 compute01 systemd-networkd[30824]: enp3s0f1: Started LLDP.
  Apr 25 12:45:33 compute01 systemd-networkd[30824]: enp3s0f1: Enslaving by 'bond0'
  Apr 25 12:45:33 compute01 systemd-networkd[30824]: bond0: Link 'enp3s0f1' was up when attempting to enslave it. Bringing link down.
  Apr 25 12:45:33 compute01 systemd-networkd[30824]: enp3s0f1: Bringing link down
  Apr 25 12:45:33 compute01 systemd-networkd[30824]: bond0: Enslaving link 'enp3s0f1'
  Apr 25 12:45:33 compute01 systemd-networkd[30824]: enp3s0f0: Link state is up-to-date
  Apr 25 12:45:33 compute01 systemd-networkd[30824]: enp3s0f0: found matching network '/etc/systemd/network/00-enp3s0f0.network'
  Apr 25 12:45:33 compute01 systemd-networkd[30824]: enp3s0f1: Link does not request DHCPv6 prefix delegation
  Apr 25 12:45:33 compute01 systemd-networkd[30824]: enp3s0f0: Started LLDP.
  Apr 25 12:45:33 compute01 systemd-networkd[30824]: enp3s0f0: Enslaving by 'bond0'
  Apr 25 12:45:33 compute01 systemd-networkd[30824]: bond0: Link 'enp3s0f0' was up when attempting to enslave it. Bringing link down.
  Apr 25 12:45:33 compute01 systemd-networkd[30824]: enp3s0f0: Bringing link down
  Apr 25 12:45:33 compute01 systemd-networkd[30824]: bond0: Enslaving link 'enp3s0f0'
  Apr 25 12:45:33 compute01 systemd-networkd[30824]: enp3s0f1: Flags change: -UP -LOWER_UP -RUNNING
  Apr 25 12:45:33 compute01 systemd-networkd[30824]: enp3s0f1: Stopped LLDP.
  Apr 25 12:45:33 compute01 systemd-networkd[30824]: enp3s0f1: Lost carrier
  Apr 25 12:45:33 compute01 systemd-networkd[30824]: enp3s0f1: State is configuring, dropping config
  Apr 25 12:45:33 compute01 systemd-networkd[30824]: enp3s0f1: Joined netdev
  Apr 25 12:45:33 compute01 systemd-networkd[30824]: enp3s0f1: Bringing link up
  Apr 25 12:45:33 compute01 systemd-networkd[30824]: enp3s0f1: IPv6 successfully enabled
  Apr 25 12:45:34 compute01 systemd-networkd[30824]: enp3s0f0: Flags change: -UP -LOWER_UP -RUNNING
  Apr 25 12:45:34 compute01 systemd-networkd[30824]: enp3s0f0: Stopped LLDP.
  Apr 25 12:45:34 compute01 systemd-networkd[30824]: enp3s0f0: Lost carrier
  Apr 25 12:45:34 compute01 systemd-networkd[30824]: enp3s0f0: State is configuring, dropping config
  Apr 25 12:45:34 compute01 systemd-networkd[30824]: enp3s0f0: Joined netdev
  Apr 25 12:45:34 compute01 systemd-networkd[30824]: enp3s0f0: Bringing link up
  Apr 25 12:45:34 compute01 systemd-networkd[30824]: enp3s0f0: IPv6 successfully enabled
  Apr 25 12:45:34 compute01 systemd-networkd[30824]: enp3s0f1: Flags change: +UP
  Apr 25 12:45:34 compute01 systemd-networkd[30824]: enp3s0f1: Started LLDP.
  Apr 25 12:45:34 compute01 systemd-networkd[30824]: enp3s0f0: Flags change: +UP +RUNNING
  Apr 25 12:45:34 compute01 systemd-networkd[30824]: enp3s0f0: Started LLDP.
  Apr 25 12:45:34 compute01 systemd-networkd[30824]: enp3s0f0: Gained carrier
  Apr 25 12:45:34 compute01 systemd-networkd[30824]: enp3s0f0: Flags change: -RUNNING
  Apr 25 12:45:34 compute01 systemd-networkd[30824]: enp3s0f0: Lost carrier
  Apr 25 12:45:34 compute01 systemd-networkd[30824]: enp3s0f0: State is configuring, dropping config
  Apr 25 12:45:37 compute01 systemd-networkd[30824]: enp3s0f0: Flags change: +LOWER_UP +RUNNING
  Apr 25 12:45:37 compute01 systemd-networkd[30824]: enp3s0f0: Gained carrier
  Apr 25 12:45:37 compute01 systemd-networkd[30824]: enp3s0f1: Flags change: +LOWER_UP +RUNNING
  Apr 25 12:45:37 compute01 systemd-networkd[30824]: enp3s0f1: Gained carrier
  ```

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