Description of problem:
VLAN interface fails to come up when  ifdown eth1.XXX; ifup eth1.XXX command is executed.

Version-Release number of selected component (if applicable):
initscripts-9.03.53-1.el6.x86_64

How reproducible:
Always

Steps to Reproduce:
$cat ifcfg-eth1.100 
DEVICE=eth1.100
TYPE=Ethernet
ONBOOT=no
NM_CONTROLLED=no
BOOTPROTO=none
IPADDR=192.168.1.100
VLAN=yes
LINKDELAY=0


#ifup eth1.100
Determining if ip address 192.168.1.100 is already in use for device eth1...
[root@localhost Desktop]#

#ifdown eth1.100; ifup eth1.100
arping: recvfrom: Network is down <<<<<

#ip addr
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN 
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
2: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 52:54:00:30:09:21 brd ff:ff:ff:ff:ff:ff
3: eth2: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 52:54:00:98:3b:1f brd ff:ff:ff:ff:ff:ff
    inet 10.10.10.253/24 brd 10.10.10.255 scope global eth2
28: eth1.100@eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP 
    link/ether 52:54:00:30:09:21 brd ff:ff:ff:ff:ff:ff

$ps auxwww |grep ifup
root      3306  0.2  0.1 108748  1976 ?        S<   11:50   0:00 /bin/bash /etc/sysconfig/network-scripts/ifup-eth ifcfg-eth1.100
root      3353  0.0  0.0 103320   828 pts/0    S+   11:51   0:00 grep ifup


Actual results:
1. VLAN interface fails to come up with configured IP.  
2. The ifup process keeps running.  cu also observed these process in 'Z' state


Expected results:
VLAN interface up with configured IP


Additional info:
1. The issue not observed in RHEL 7. 
2. Issue observed for VLAN interfaces. 
3. Tried to reproduce it for alias interfaces (eth1:0). But was not success. Command executed successfully.