[Bug 1565804] Re: ifup of vlan interfaces failing during networking start - RTNETLINK answers: File exists

[Dan Streetman]

This is a side effect / duplicate of bug 1224007.  The initial problem
is the high vlan mtu setting, and the "File Exists" error is because
ifup doesn't unwind on failure, so the interface is ip but not
configured, which causes ifup to keep failing because it isn't expecting
the interface to already be up.

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Title:
  ifup of vlan interfaces failing during networking start - RTNETLINK
  answers: File exists

Status in ifupdown package in Ubuntu:
  Confirmed

Bug description:
  /e/n/i:

  auto lo
  iface lo inet loopback
      dns-nameservers 10.245.168.2
      dns-search dellstack
  auto eth0
  iface eth0 inet static
      gateway 10.245.168.1
      address 10.245.168.17/21
      dns-nameservers 10.245.168.2
      mtu 1500

  auto eth1
  iface eth1 inet manual
      mtu 1500

  auto eth1.2667
  iface eth1.2667 inet static
      address 10.245.184.20/24
      vlan-raw-device eth1
      mtu 9000
      vlan_id 2667

  output from networking startup:

  ● networking.service - Raise network interfaces
     Loaded: loaded (/lib/systemd/system/networking.service; enabled; vendor preset: enabled)
    Drop-In: /run/systemd/generator/networking.service.d
             └─50-insserv.conf-$network.conf
     Active: failed (Result: exit-code) since Mon 2016-04-04 12:14:26 UTC; 1h 33min ago
       Docs: man:interfaces(5)
    Process: 1255 ExecStart=/sbin/ifup -a --read-environment (code=exited, status=1/FAILURE)
    Process: 868 ExecStartPre=/bin/sh -c [ "$CONFIGURE_INTERFACES" != "no" ] && [ -n "$(ifquery --read-environment --list --exclude=lo)" ] && udevadm settle (code=exited, 
   Main PID: 1255 (code=exited, status=1/FAILURE)

  Apr 04 12:14:25 reflecting-attraction systemd[1]: Starting Raise network interfaces...
  Apr 04 12:14:26 reflecting-attraction ifup[1255]: Set name-type for VLAN subsystem. Should be visible in /proc/net/vlan/config
  Apr 04 12:14:26 reflecting-attraction ifup[1255]: RTNETLINK answers: File exists
  Apr 04 12:14:26 reflecting-attraction ifup[1255]: Failed to bring up eth1.2667.
  Apr 04 12:14:26 reflecting-attraction systemd[1]: networking.service: Main process exited, code=exited, status=1/FAILURE
  Apr 04 12:14:26 reflecting-attraction systemd[1]: Failed to start Raise network interfaces.
  Apr 04 12:14:26 reflecting-attraction systemd[1]: networking.service: Unit entered failed state.
  Apr 04 12:14:26 reflecting-attraction systemd[1]: networking.service: Failed with result 'exit-code'.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: ifupdown 0.8.10ubuntu1
  ProcVersionSignature: User Name 4.4.0-16.32-generic 4.4.6
  Uname: Linux 4.4.0-16-generic x86_64
  ApportVersion: 2.20.1-0ubuntu1
  Architecture: amd64
  Date: Mon Apr  4 13:42:48 2016
  SourcePackage: ifupdown
  UpgradeStatus: No upgrade log present (probably fresh install)

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