Comment 0 for bug 1295304

This has been observed in trusty:
ii ifupdown 0.7.47.2ubuntu1 amd64 high level tools to configure network interfaces

VLAN interfaces are unable to be brought down properly with ifdown -a:

$ sudo ifdown -av
run-parts --verbose /etc/network/if-down.d
run-parts: executing /etc/network/if-down.d/resolvconf
run-parts: executing /etc/network/if-down.d/upstart
Configuring interface bond0.205=bond0.205 (inet)
run-parts --verbose /etc/network/if-down.d
run-parts: executing /etc/network/if-down.d/resolvconf
run-parts: executing /etc/network/if-down.d/upstart

ip -4 addr flush dev bond0.205 label bond0.205
run-parts --verbose /etc/network/if-post-down.d
run-parts: executing /etc/network/if-post-down.d/bridge
run-parts: executing /etc/network/if-post-down.d/ifenslave
+ BOND_PARAMS=/sys/class/net/bond0.205/bonding
+ IFSTATE=/run/network/ifstate
+ [ -f /sys/class/net/bond0.205/master/bonding/slaves ]
+ [ ! -f /sys/class/net/bond0.205/bonding/slaves ]
+ exit
run-parts: executing /etc/network/if-post-down.d/vlan
Removed VLAN -:bond0.205:-
ip link del bond0.205
Cannot find device "bond0.205"
run-parts --verbose /etc/network/if-post-down.d
run-parts: executing /etc/network/if-post-down.d/bridge
run-parts: executing /etc/network/if-post-down.d/ifenslave
+ BOND_PARAMS=/sys/class/net/--all/bonding
+ IFSTATE=/run/network/ifstate
+ [ -f /sys/class/net/--all/master/bonding/slaves ]
+ [ ! -f /sys/class/net/--all/bonding/slaves ]
+ exit
run-parts: executing /etc/network/if-post-down.d/vlan

$ ifconfig
bond0 Link encap:Ethernet HWaddr 52:54:00:ae:24:cf
          inet addr:192.168.122.207 Bcast:192.168.122.255 Mask:255.255.255.0
          UP BROADCAST RUNNING MASTER MULTICAST MTU:1500 Metric:1
          RX packets:114 errors:0 dropped:53 overruns:0 frame:0
          TX packets:61 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:7630 (7.6 KB) TX bytes:5102 (5.1 KB)

bond0.201 Link encap:Ethernet HWaddr 52:54:00:ae:24:cf
          inet addr:192.168.201.10 Bcast:192.168.201.255 Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:1 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:0 (0.0 B) TX bytes:42 (42.0 B)

eth0 Link encap:Ethernet HWaddr 52:54:00:ae:24:cf
          UP BROADCAST RUNNING SLAVE MULTICAST MTU:1500 Metric:1
          RX packets:56 errors:0 dropped:53 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:3170 (3.1 KB) TX bytes:0 (0.0 B)

eth1 Link encap:Ethernet HWaddr 52:54:00:ae:24:cf
          UP BROADCAST RUNNING SLAVE MULTICAST MTU:1500 Metric:1
          RX packets:58 errors:0 dropped:0 overruns:0 frame:0
          TX packets:61 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:4460 (4.4 KB) TX bytes:5102 (5.1 KB)

lo Link encap:Local Loopback
          inet addr:127.0.0.1 Mask:255.0.0.0
          UP LOOPBACK RUNNING MTU:65536 Metric:1
          RX packets:16 errors:0 dropped:0 overruns:0 frame:0
          TX packets:16 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:1184 (1.1 KB) TX bytes:1184 (1.1 KB)

We'd expect that all interfaces come down with 'ifdown -a', but we get this error.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: ifupdown 0.7.47.2ubuntu1
ProcVersionSignature: User Name 3.13.0-17.37-generic 3.13.6
Uname: Linux 3.13.0-17-generic x86_64
ApportVersion: 2.13.3-0ubuntu1
Architecture: amd64
Date: Thu Mar 20 18:16:49 2014
ProcEnviron:
 TERM=vt102
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: ifupdown
UpgradeStatus: No upgrade log present (probably fresh install)