This bug is caused in two different ways, both not directly from
ifupdown or vlan, but instead because of 'helpful' actions in the
ifenslave and bridge-utils if-pre-up scripts.
First, as reported in this bug, the bridge-utils package adds a
if-pre-up.d/bridge ifupdown script, and in that script it does this:
bridge_parse_ports $INTERFACES | while read i
do
for port in $i
do
# We attach and configure each port of the bridge
if [ "$MODE" = "start" ] && [ ! -d /sys/class/net/$IFACE/brif/$port ]; then
if [ -x /etc/network/if-pre-up.d/vlan ]; then
env IFACE=$port /etc/network/if-pre-up.d/vlan
fi
As pointed out in comment 2, this is done because debian decided ifupdown
should handle the case of a bridge configuration with port(s) using vlan(s)
that are not configured/created anywhere else in the ifupdown configuration.
So, bridge-utils must assume it needs to create any new vlan(s) for its port(s).
Unfortunately, now that the if-pre-up.d/vlan tries to ifup its raw-
device interface (due to bug 1573272) this can lead to a hang, as shown
in this bug's description.
Second, as reported in bug 1759573, the ifenslave package adds a
if-pre-up.d/ifenslave script, and that script does this:
# Trigger the udev bridging hook to bridge the bond if needed
if [ -x /lib/udev/bridge-network-interface ]; then
INTERFACE=$BOND_MASTER /lib/udev/bridge-network-interface
fi
# Trigger the udev bridging hook to tag the bond if needed
if [ -x /lib/udev/vlan-network-interface ]; then
INTERFACE=$BOND_MASTER /lib/udev/vlan-network-interface
fi
This is done for the reasons commented there. Unfortunately, BOTH the
/lib/udev/bridge-network-interface as well as the /lib/udev/vlan-
network-interface call back to the if-pre-up.d/vlan script, which then
tries to ifup the vlan's raw-device, again leading to a hang.
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https://bugs.launchpad.net/bugs/1701023
Title:
(on trusty) version 1.9-3ubuntu10.4 regression blocking boot
completion
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