[Bug 1759573] Re: vlan on top of untagged network won't start

[Dan Streetman]

** This bug is no longer a duplicate of bug 1701023
   (on trusty) version 1.9-3ubuntu10.4 regression blocking boot completion

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Title:
  vlan on top of untagged network won't start

Status in ifupdown package in Ubuntu:
  New
Status in vlan package in Ubuntu:
  New

Bug description:

  Due to an upgrade (of probably of the ifupdown or vlan package), this specific network configuration no longer comes up automatically:
  1) Two or more network interfaces bonded
  2) An untagged network configured on that bond
  3) A vlan on top of that untagged network

  What does come up automatically:
  1) A single (e.g. unbonded) network interface with an untagged network configured and a vlan on top of that network
  2) Two or more network interfaces bonded with a vlan on top of that untagged bond

  An exact example of the configuration that doesn't work is provided
  below. It fails to come up correctly, both during boot and manually.
  The problem seems to be a blocking dependency loop between the bond
  and the vlan.

  As recommended in
  https://bugs.launchpad.net/ubuntu/+source/ifupdown/+bug/1636708/comments/13
  we added dependency ordering using ifup at .service systemd units for all
  4 interfaces, but this did not affect the behaviour in any way.

  Perhaps related to LP bug 1573272 or bug 1636708 ?

  ==========================================================
  Interface configuration
  ==========================================================

  auto eno1
  iface eno1 inet manual
     mtu 1500
     bond-master bond1
     bond-primary eno1

  auto eno2
  iface eno2 inet manual
     mtu 1500
     bond-master bond1

  auto bond1
  iface bond1 inet static
     mtu 1500
     address 10.10.10.3
     bond-miimon 100
     bond-mode active-backup
     bond-slaves none
     bond-downdelay 0
     bond-updelay 0
     dns-nameservers 10.10.10.1
     gateway 10.10.10.1
     netmask 255.255.0.0

  auto bond1.2
  iface bond1.2 inet static
     mtu 1500
     address 10.11.10.3
     netmask 255.255.0.0
     vlan-raw-device bond1

  ==========================================================
  When bringing up the bond
  ==========================================================

  # ifup bond1 &
  Waiting for a slave to join bond1 (will timeout after 60s)
  # ps afx
  (...)
  ifup bond1
   \_ /bin/sh -c /bin/run-parts --exit-on-error /etc/network/if-pre-up.d
       \_ /bin/run-parts --exit-on-error /etc/network/if-pre-up.d
           \_ /bin/sh /etc/network/if-pre-up.d/ifenslave
  (...)
  /lib/systemd/systemd-udevd
   \_ /lib/systemd/systemd-udevd
       \_ /bin/sh /lib/udev/vlan-network-interface
           \_ /bin/sh /etc/network/if-pre-up.d/vlan
               \_ ifup bond1
  (...)

  ==> After waiting 60 seconds:

  # ip link | grep -E 'eno[1|2]|bond1*'
  eno1: <BROADCAST,MULTICAST> mtu 1500 qdisc mq state DOWN mode DEFAULT group default qlen 1000
  eno2: <BROADCAST,MULTICAST> mtu 1500 qdisc mq state DOWN mode DEFAULT group default qlen 1000
  bond1: <NO-CARRIER,BROADCAST,MULTICAST,MASTER,UP> mtu 1500 qdisc noqueue state DOWN mode DEFAULT group default qlen 1000
  bond1.2 at bond1: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state LOWERLAYERDOWN mode DEFAULT group default qlen 1000

  ==========================================================
  When bringing up a slave
  ==========================================================

  # ifup eno1
  Waiting for bond master bond1 to be ready
  # ps afx
  (...)
  /lib/systemd/systemd-udevd
   \_ /lib/systemd/systemd-udevd
       \_ /bin/sh /lib/udev/vlan-network-interface
           \_ /bin/sh /etc/network/if-pre-up.d/vlan
               \_ ifup bond1
                   \_ /bin/sh -c /bin/run-parts --exit-on-error /etc/network/if-pre-up.d
                       \_ /bin/run-parts --exit-on-error /etc/network/if-pre-up.d
                           \_ /bin/sh /etc/network/if-pre-up.d/ifenslave
                               \_ /bin/sh /lib/udev/vlan-network-interface
                                   \_ /bin/sh /etc/network/if-pre-up.d/vlan
                                       \_ ifup bond1
  (...)
  # ip link | grep -E 'eno[1|2]|bond1*'
  eno1: <BROADCAST,MULTICAST,SLAVE,UP,LOWER_UP> mtu 1500 qdisc mq master bond1 state UP mode DEFAULT group default qlen 1000
  eno2: <BROADCAST,MULTICAST> mtu 1500 qdisc mq state DOWN mode DEFAULT group default qlen 1000
  bond1: <BROADCAST,MULTICAST,MASTER,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP mode DEFAULT group default qlen 1000

  ==========================================================
  Only workaround that works
  ==========================================================

  # ifup eno1
  Waiting for bond master bond1 to be ready
  # kill $(ps -ef | grep 'ifup bond1' | sed -n 2p | awk '{ print $2}')
  # ifup eno2

  # ip link | grep -E 'eno[1|2]|bond1*'
  eno1: <BROADCAST,MULTICAST,SLAVE,UP,LOWER_UP> mtu 1500 qdisc mq master bond1 state UP mode DEFAULT group default qlen 1000
  eno2: <BROADCAST,MULTICAST,SLAVE,UP,LOWER_UP> mtu 1500 qdisc mq master bond1 state UP mode DEFAULT group default qlen 1000
  bond1: <BROADCAST,MULTICAST,MASTER,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP mode DEFAULT group default qlen 1000
  bond1.2 at bond1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP mode DEFAULT group default qlen 1000

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