networking services restart hangs due to missing /etc/network/run/ifenslave.* files

Ubuntu 12.04 LTS
ifenslave-2.6

ifup hangs when bonds are configured and networking is restarted via '/etc/init.d/networking restart'. The script in '/etc/network/if-pre-up.d' does not recognize the bond master and hangs because the '/etc/network/run/ifenslave.*' files are not created.

##/etc/network/if-pre-up.d/ifenslave

#!/bin/sh

[ "$VERBOSITY" = 1 ] && set -x

IFSTATE=/run/network/ifstate

add_master()
{
 # Return if $BOND_MASTER is already a bonding interface.
 [ -f "/sys/class/net/$BOND_MASTER/bonding/slaves" ] && return

 # If the bonding module is not yet loaded, load it.
 if [ ! -r /sys/class/net/bonding_masters ]; then
  modprobe -q bonding

  FAILED=1
  echo "Waiting for bonding kernel module to be ready (will timeout after 5s)"
  for i in $(seq 50); do
   if [ -r /sys/class/net/bonding_masters ]; then
    FAILED=0
    break
   fi
   sleep 0.1
  done

  if [ "$FAILED" = "1" ]; then
   echo "/sys/class/net/bonding_masters doesn't exist. Unable to create $BOND_MASTER"
   exit 1
  fi

 fi

 # Create the master interface.
 if ! grep -sq "\\<$BOND_MASTER\\>" /sys/class/net/bonding_masters; then
  echo "+$BOND_MASTER" > /sys/class/net/bonding_masters
 fi
}

sysfs_change_down()
{
 # Called with :
 # $1 = basename of the file in bonding/ to write to.
 # $2 = value to write. Won't write if $2 is empty.
 if [ "$2" ] ; then
  # If the value we plan to write is different from the current one...
  if ! grep -sq "\\<$2\\>" "/sys/class/net/$BOND_MASTER/bonding/$1" ; then
   # ...and the master is up...
   if ip link show "$BOND_MASTER" | grep -sq '[<,]UP[,>]' ; then
    # ...bring the master down.
    ip link set dev "$BOND_MASTER" down
   fi
  fi
  sysfs "$1" "$2"
 fi
}

sysfs()
{
 # Called with :
 # $1 = basename of the file in bonding/ to write to.
 # $2 = value to write. Won't write if $2 is empty.
 if [ "$2" ] ; then
  echo "$2" > "/sys/class/net/$BOND_MASTER/bonding/$1"
  return $?
 fi
 return 0
}

sysfs_add()
{
 #??Called with :
 # $1 = target filename.
 # $2 = values to write.
 for value in $2; do
  # Do not add $2 to $1 if already present.
  if ! grep -sq "\\<$value\\>" /sys/class/net/$BOND_MASTER/bonding/$1
  then
      sysfs "$1" "+$value"
  fi
 done
}

# early_setup_master is the place where we do master setup that need to be done before enslavement.
early_setup_master()
{
 # Warning: the order in wich we write into the sysfs files is important.
 # Double check in drivers/net/bonding/bond_sysfs.c in linux kernel source tree
 # before changing anything here.

 # fail_over_mac must be set before enslavement of any slaves.
 sysfs fail_over_mac "$IF_BOND_FAIL_OVER_MAC"
}

# late_setup_master runs actions that need to happen after enslavement
late_setup_master()
{
 # primary must be set after mode (because only supported in some modes) and after enslavement.
 # The first slave in bond-primary found in current slaves becomes the primary.
 # If no slave in bond-primary is found, then primary does not change.
 for slave in $IF_BOND_PRIMARY ; do
  if grep -sq "\\<$slave\\>" "/sys/class/net/$BOND_MASTER/bonding/slaves" ; then
   sysfs primary "$slave"
   break
  fi
 done

 # primary_reselect should be set after mode (because only supported in some modes), after enslavement
 # and after primary. This is currently (2.6.35-rc1) not enforced by the bonding driver, but it is
 # probably safer to do it in that order.
 sysfs primary_reselect "$IF_BOND_PRIMARY_RESELECT"

 # queue_id must be set after enslavement.
 for iface_queue_id in $IF_BOND_QUEUE_ID
 do
  sysfs iface_queue_id $iface_queue_id
 done

 # active_slave must be set after mode and after enslavement.
 # The slave must be up and the underlying link must be up too.
 # FIXME: We should have a way to write an empty string to active_slave, to set the active_slave to none.
 if [ "$IF_BOND_ACTIVE_SLAVE" ] ; then
  # Need to force interface up before. Bonding will refuse to activate a down interface.
  ip link set "$IF_BOND_ACTIVE_SLAVE" up
  sysfs active_slave "$IF_BOND_ACTIVE_SLAVE"
 fi
}

enslave_slaves()
{
 case "$BOND_SLAVES" in
  none)
   BOND_SLAVES=""
   ;;
  all)
   BOND_SLAVES=`sed -ne 's/ *\(eth[^:]*\):.*/\1/p' /proc/net/dev`
   AUTOIF="yes"
   ;;
 esac

 [ "$VERBOSITY" = 1 ] && v=-v
 for slave in $BOND_SLAVES ; do
  if ( [ "$AUTOIF" ] && grep -q "^$slave=" $IFSTATE ) ; then
   echo "Not enslaving interface $slave since it is already configured"
  else
   # Ensure $slave is down.
   ip link set "$slave" down 2>/dev/null
   if ! sysfs_add slaves "$slave" 2>/dev/null ; then
    echo "Failed to enslave $slave to $BOND_MASTER. Is $BOND_MASTER ready and a bonding interface ?" >&2
   else
    # Bring up slave if it is the target of an allow-bondX stanza.
    # This is usefull to bring up slaves that need extra setup.
    if [ -z "$(which ifquery)" ] || ifquery --allow \"$BOND_MASTER\" --list | grep -q $slave; then
     ifup $v --allow "$BOND_MASTER" "$slave"
    fi
   fi
  fi
 done
}

setup_master()
{
 # Warning: the order in wich we write into the sysfs files is important.
 # Double check in drivers/net/bonding/bond_sysfs.c in linux kernel source tree
 # before changing anything here.

 # use_carrier can be set anytime.
 sysfs use_carrier "$IF_BOND_USE_CARRIER"
 # num_grat_arp can be set anytime.
 sysfs num_grat_arp "$IF_BOND_NUM_GRAT_ARP"
 # num_unsol_na can be set anytime.
 sysfs num_unsol_na "$IF_BOND_NUM_UNSOL_NA"

 # xmit_hash_policy can be set anytime.
 # Changing xmit_hash_policy requires $BOND_MASTER to be down.
 sysfs_change_down xmit_hash_policy "$IF_BOND_XMIT_HASH_POLICY"

 # arp_ip_target must be set before arp_interval.
 sysfs_add arp_ip_target "$IF_BOND_ARP_IP_TARGET"
 sysfs arp_interval "$IF_BOND_ARP_INTERVAL"

 # miimon must be set before updelay and downdelay.
 sysfs miimon "$IF_BOND_MIIMON"
 sysfs downdelay "$IF_BOND_DOWNDELAY"
 sysfs updelay "$IF_BOND_UPDELAY"

 # Changing ad_select requires $BOND_MASTER to be down.
 sysfs_change_down ad_select "$IF_BOND_AD_SELECT"

 # Changing mode requires $BOND_MASTER to be down.
 # Mode should be set after miimon or arp_interval, to avoid a warning in syslog.
 sysfs_change_down mode "$IF_BOND_MODE"

 # arp_validate must be after mode (because mode must be active-backup).
 sysfs arp_validate "$IF_BOND_ARP_VALIDATE"

 # lacp_rate must be set after mode (because mode must be 802.3ad).
 # Changing lacp_rate requires $BOND_MASTER to be down.
 sysfs_change_down lacp_rate "$IF_BOND_LACP_RATE"

 # Finally bring the bond up, note that without a slave it won't be usable though
 ip link set dev $BOND_MASTER up
}

# Option slaves deprecated, replaced by bond-slaves, but still supported for backward compatibility.
IF_BOND_SLAVES=${IF_BOND_SLAVES:-$IF_SLAVES}

if [ "$IF_BOND_MASTER" ] ; then
 BOND_MASTER="$IF_BOND_MASTER"
 BOND_SLAVES="$IFACE"
else
 if [ "$IF_BOND_SLAVES" ] ; then
  BOND_MASTER="$IFACE"
  BOND_SLAVES="$IF_BOND_SLAVES"
 fi
fi

# Exit if nothing to do...
[ -z "$BOND_MASTER$BOND_SLAVES" ] && exit

# Always try to create the master, returns if already exists
add_master

if [ "$BOND_MASTER" = "$IFACE" ]; then
 # Setup the master interface
 early_setup_master
 setup_master

 # Indicate that we're done setting up the master
 # this is required as ifstate is modified at the beginning
 # of the interface setup, not at the end
 touch /run/network/ifenslave.$IFACE

 # Wait for a slave to join, continuing without a slave
 # would make dhclient, vconfig or brctl fail, so better wait
 # Timeout after a minute
 FAILED=1
 echo "Waiting for a slave to join $BOND_MASTER (will timeout after 60s)"
 for i in $(seq 600); do
  if [ -n "$(cat /sys/class/net/$BOND_MASTER/bonding/slaves)" ]; then
   FAILED=0
   break
  fi
  sleep 0.1
 done
 if [ "$FAILED" = "1" ]; then
  echo "No slave joined $BOND_MASTER, continuing anyway"
 else
  # Trigger the udev bridging hook to bridge the bond if needed
  if [ -x /lib/udev/bridge-network-interface ]; then
   INTERFACE=$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=$BOND_MASTER /lib/udev/vlan-network-interface
  fi
 fi
else
 # Wait for the master to be ready
 [ ! -f /run/network/ifenslave.$BOND_MASTER ] && echo "Waiting for bond master $BOND_MASTER to be ready"
 while :; do
  if [ -f /run/network/ifenslave.$BOND_MASTER ]; then
   break
  fi
  sleep 0.1
 done

 # Only setup one slave at once
 BOND_SLAVES=$IFACE enslave_slaves

 # Call late_setup_master every time we add a slave as we don't have a way to know
 # when all the slaves are up
 BOND_SLAVES=$IFACE late_setup_master
fi
exit 0

## /etc/network/interfaces
# This file describes the network interfaces available on your system
# and how they will be activated. For more information, see interfaces(5).
# chef managed!

auto eth1
iface eth1 inet manual
  bond-master bond0
  bond-primary eth1

# default bridge interface
 auto backend
iface backend inet manual
  bridge_fd 0
  bridge_ports vlan10
  bridge_stp off

# failover nic team
 auto bond0
iface bond0 inet manual
  bond-miimon 100
  bond-mode active-backup
  bond-primary eth1
  bond-slaves none

# The VM network interface
 auto eth0
iface eth0 inet static
  address 10.0.2.15
  broadcast 10.0.2.255
  gateway 10.0.2.0
  netmask 255.255.255.0

# The loopback interface
 auto lo
iface lo inet loopback

# default vlan interface
 auto vlan10
iface vlan10 inet manual
  vlan_raw_device bond0

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: ifenslave-2.6 1.1.0-19ubuntu5
ProcVersionSignature: Ubuntu 3.2.0-32.51-generic 3.2.30
Uname: Linux 3.2.0-32-generic x86_64
ApportVersion: 2.0.1-0ubuntu17.1
Architecture: amd64
Date: Thu Jan 16 17:34:48 2014
InstallationMedia: Ubuntu-Server 12.04.1 LTS "Precise Pangolin" - Release amd64 (20120817.3)
MarkForUpload: True
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: ifenslave-2.6
UpgradeStatus: No upgrade log present (probably fresh install)