I was able to reproduce this bug on a non-Xen kernel as well. I've
also found that the bug appears to manifest itself when the aliased
interface uses an address on the host interface's network, but not when
the alias is on a different network:
# ifconfig eth1 10.20.30.41 netmask 255.255.255.0
# ifconfig eth1:0 10.20.30.42 netmask 255.255.255.0
# ip addr flush eth1
Failed to send flush request: Cannot assign requested address
# echo $?
1
# ip addr show eth1
3: eth1: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast
state DOWN qlen 1000
link/ether 00:d0:b7:xx:xx:xx brd ff:ff:ff:ff:ff:ff
# ifconfig eth1 10.20.30.41 netmask 255.255.255.0
# ifconfig eth1:0 10.20.30.42 netmask 255.255.255.0
# ip addr show eth1
3: eth1: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast
state DOWN qlen 1000
link/ether 00:d0:b7:xx:xx:xx brd ff:ff:ff:ff:ff:ff
inet 10.20.30.41/24 brd 10.20.30.255 scope global eth1
inet 10.20.30.42/24 brd 10.20.30.255 scope global secondary eth1:0
# ip addr flush eth1
Failed to send flush request: Cannot assign requested address
# ip addr show eth1
3: eth1: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast
state DOWN qlen 1000
link/ether 00:d0:b7:xx:xx:xx brd ff:ff:ff:ff:ff:ff
# ifconfig eth1 10.20.30.41 netmask 255.255.255.0
# ifconfig eth1:0 10.255.30.42 netmask 255.255.255.0
# ip addr show eth1
3: eth1: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast
state DOWN qlen 1000
link/ether 00:d0:b7:xx:xx:xx brd ff:ff:ff:ff:ff:ff
inet 10.20.30.41/24 brd 10.20.30.255 scope global eth1
inet 10.255.30.42/24 brd 10.255.30.255 scope global eth1:0
# ip addr flush eth1
#
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