Hello Everyone,
I have set up a xen server with 10 physical network devices using the bridge
mode of XEN. This is because I want to split and separate the network traffic
for security reasons. Maybe the best way is to use pci back hide. But I want to
understand what is going on here.
For all testings I have only activated eth[0-3].
My first tests were successful. I have created a VM using 'xm'. But we got some
network problems:
root@bs-xen-p-01:~[0]# netstat -rnv
Kernel IP routing table
Destination Gateway Genmask Flags MSS Window irtt Iface
10.1.17.10 10.1.1.1 255.255.255.255 UGH 0 0 0 eth0
10.1.17.0 0.0.0.0 255.255.255.0 U 0 0 0 eth3
10.1.32.0 0.0.0.0 255.255.255.0 U 0 0 0 eth2
10.1.1.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0
10.1.19.0 0.0.0.0 255.255.255.0 U 0 0 0 eth1
0.0.0.0 10.1.1.1 0.0.0.0 UG 0 0 0 eth0
root@bs-xen-p-01:~[0]#
The routing for eth3, eth3 and eth1 points back to his source. To get partial
rid of the network problems we first define the first rule (we administrate the
xen server through a portal running in the 10.1.17.0/24 segment).
Then I have had the idea to define the physical interfaces in network config to
some IP's residing in the same subnet as the xen server itself (10.1.1.0/24) i.
e.:
auto eth1
allow-hotplug eth1
iface eth1 inet static
address 10.1.1.201
netmask 255.255.255.0
network 1.1.1.0
But since I have done this and restarted the network, the VM cannot start any
more.
I have rebooted the machine - nothing
I have set back the network interface - nothing
I have rebooted the machine - nothing
ifconfig shows only eth[0-9] and lo. bridge control:
root@bs-xen-p-01:~[0]# brctl show
bridge name bridge id STP enabled interfaces
root@bs-xen-p-01:~[0]#
All I've got is a message:
root@bs-xen-p-01:~[0]# xm create otrs-test.sxp
Using config file "/etc/xen/otrs-test.sxp".
Error: Device 0 (vif) could not be connected. Hotplug scripts not working.
root@bs-xen-p-01:~[0]#
The orts-test.sxp file:
name = "otrs-test"
kernel = "/boot/vmlinuz-2.6.18-4-xen-amd64"
ramdisk = "/boot/initrd.img-2.6.18-4-xen-amd64"
memory = 512
disk = [ 'phy:lvm-vg1/vm-otrs-test,sda1,w' ]
root = "/dev/sda1 ro"
vif = [ 'ip=10.1.19.20,mac=00:16:de:ad:fa:cd,bridge=xenbr1' ]
dhcp="off"
netmask="255.255.255.0"
gateway="10.1.19.1"
hostname="otrs-test"
If I set vif to [ '' ] and try starting the VM:
root@bs-xen-p-01:~[0]# xm create otrs-test.sxp
Using config file "/etc/xen/otrs-test.sxp".
Error: Device 0 (vif) could not be connected. Backend device not found.
root@bs-xen-p-01:~[1]#
So I start the bridge manually:
/etc/xen/scripts/network-bridge start vifnum=0 bridge=xenbr0 netdev=eth0
/etc/xen/scripts/network-bridge start vifnum=1 bridge=xenbr1 netdev=eth1
/etc/xen/scripts/network-bridge start vifnum=2 bridge=xenbr2 netdev=eth2
root@bs-xen-p-01:~[0]# dmesg|grep xenbr0
xenbr0: port 1(vif0.0) entering learning state
xenbr0: topology change detected, propagating
xenbr0: port 1(vif0.0) entering forwarding state
xenbr0: port 2(peth0) entering learning state
xenbr0: topology change detected, propagating
xenbr0: port 2(peth0) entering forwarding state
xenbr0: port 1(vif0.0) entering disabled state
xenbr0: port 2(peth0) entering disabled state
xenbr0: port 2(peth0) entering disabled state
xenbr0: port 1(vif0.0) entering disabled state
root@bs-xen-p-01:~[0]# dmesg|grep xenbr1
xenbr1: port 1(vif0.1) entering learning state
xenbr1: topology change detected, propagating
xenbr1: port 1(vif0.1) entering forwarding state
xenbr1: port 2(peth1) entering learning state
xenbr1: topology change detected, propagating
xenbr1: port 2(peth1) entering forwarding state
root@bs-xen-p-01:~[0]# dmesg|grep xenbr2
xenbr2: port 1(vif0.2) entering learning state
xenbr2: topology change detected, propagating
xenbr2: port 1(vif0.2) entering forwarding state
xenbr2: port 2(peth2) entering learning state
xenbr2: topology change detected, propagating
xenbr2: port 2(peth2) entering forwarding state
root@bs-xen-p-01:~[0]#
ifconfig shows eth[0-3], lo, peth[1-2], vif0.[1-2] and xenbr[1-2]. All
interfaces up and running and have a link status.
I fired up the VM, the VM starts, but ends up in the maintenance mode because
the filesystem of the VM is mounted read only. If I gave the root password to
enter the maintenance mode I can see the networking is not startet (ifconfig
shows nothing).
On the xen side:
root@bs-xen-p-01:~[0]# brctl show
bridge name bridge id STP enabled interfaces
xenbr0 8000.feffffffffff no vif0.0
peth0
xenbr1 8000.feffffffffff no vif0.1
peth1
vif6.0
xenbr2 8000.feffffffffff no vif0.2
peth2
root@bs-xen-p-01:~[0]#
I have viewed /var/log/xen/*, /var/log/messages and dmesg. The only hint I have
found is in xen-hotplug.log:
Nothing to flush.
bridge xenbr1 does not exist!
So I switched on (set -x) the "debug" mode in the xen-hotplug-common.sh. Then I
rebooted the machine. After rebooting I only try to start the VM. You can see
the result in the attached file. I have seen several 'trap sigerr ERR' but I
don't understand where they come from.
Could someone help me, not only explaining the last error.
Are there any suggestions setting up a XEN server with many physical network
interfaces?
Christian Placzek
Nothing to flush.
bridge xenbr1 does not exist!
Nothing to flush.
bridge xenbr1 does not exist!
Nothing to flush.
bridge xenbr1 does not exist!
Nothing to flush.
bridge xenbr1 does not exist!
+++ export
PATH=/sbin:/bin:/usr/bin:/usr/sbin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
+++
PATH=/sbin:/bin:/usr/bin:/usr/sbin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
+++ export LANG=POSIX
+++ LANG=POSIX
++++ set
++++ grep '^LC_'
++++ cut -d= -f1
+++ unset
+++ trap sigerr ERR
+++ log debug add XENBUS_PATH=backend/vbd/5/2049
+++ local level=debug
+++ shift
+++ logger -p daemon.debug -- /etc/xen/scripts/block: add
XENBUS_PATH=backend/vbd/5/2049
++ findCommand add
++ for arg in '"$@"'
++ expr index add =
+++ export
PATH=/sbin:/bin:/usr/bin:/usr/sbin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
+++
PATH=/sbin:/bin:/usr/bin:/usr/sbin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
+++ export LANG=POSIX
+++ LANG=POSIX
++++ set
++++ grep '^LC_'
++++ cut -d= -f1
++ command=add
++ return
++ '[' add '!=' add ']'
++ XENBUS_PATH=backend/vbd/5/2049
++ xenstore_read_default backend/vbd/5/2049/type MISSING
++ xenstore-read backend/vbd/5/2049/type
+++ unset
+++ trap sigerr ERR
+++ log debug online XENBUS_PATH=backend/vif/5/0
+++ local level=debug
+++ shift
+++ logger -p daemon.debug -- /etc/xen/scripts/vif-bridge: online
XENBUS_PATH=backend/vif/5/0
++ . /etc/xen/scripts/xen-network-common.sh
+++ '[' -e /etc/SuSE-release ']'
+++ which ifup
++ findCommand online
++ for arg in '"$@"'
++ expr index online =
++ command=online
++ return
++ '[' online '!=' online ']'
++ case "$command" in
++ evalVariables online
++ for arg in '"$@"'
++ expr index online = '>' 1
++ ip=
+++ xenstore_read_default backend/vif/5/0/ip ''
+++ xenstore-read backend/vif/5/0/ip
+ t=phy
+ case "$command" in
++ xenstore_read_default backend/vbd/5/2049/physical-device MISSING
++ xenstore-read backend/vbd/5/2049/physical-device
++ ip=10.1.19.20
++ XENBUS_PATH=backend/vif/5/0
++ vif=vif5.0
+++ xenstore_read_default backend/vif/5/0/vifname ''
+++ xenstore-read backend/vif/5/0/vifname
++ echo MISSING
+ phys=MISSING
+ '[' MISSING '!=' MISSING ']'
+ '[' -n phy ']'
++ xenstore_read backend/vbd/5/2049/params
+++ xenstore-read backend/vbd/5/2049/params
+++ echo ''
++ vifname=
++ '[' '' ']'
+ bridge=
++ xenstore_read_default backend/vif/5/0/bridge ''
++ xenstore-read backend/vif/5/0/bridge
++ local v=lvm-vg1/vm-otrs-test
++ '[' lvm-vg1/vm-otrs-test '!=' '' ']'
++ echo lvm-vg1/vm-otrs-test
+ p=lvm-vg1/vm-otrs-test
++ xenstore_read backend/vbd/5/2049/mode
+++ xenstore-read backend/vbd/5/2049/mode
+ bridge=xenbr1
+ '[' -z xenbr1 ']'
+ case "$command" in
+ setup_bridge_port vif5.0
+ local dev=vif5.0
+ ip link set vif5.0 down
+ ip link set vif5.0 arp off
+ ip link set vif5.0 multicast off
++ local v=w
++ '[' w '!=' '' ']'
++ echo w
+ ip link set vif5.0 addr fe:ff:ff:ff:ff:ff
+ mode=w
+ case $t in
++ expand_dev lvm-vg1/vm-otrs-test
++ local dev
++ case $1 in
++ dev=/dev/lvm-vg1/vm-otrs-test
++ echo -n /dev/lvm-vg1/vm-otrs-test
+ dev=/dev/lvm-vg1/vm-otrs-test
++ xenstore_read backend/vbd/5/2049/frontend-id
+++ xenstore-read backend/vbd/5/2049/frontend-id
+ ip addr flush vif5.0
Nothing to flush.
+ add_to_bridge xenbr1 vif5.0
+ local bridge=xenbr1
+ local dev=vif5.0
+ '[' -e /sys/class/net/xenbr1/brif/vif5.0 ']'
+ brctl addif xenbr1 vif5.0
++ local v=5
++ '[' 5 '!=' '' ']'
++ echo 5
+ FRONTEND_ID=5
++ xenstore_read_default /local/domain/5/vm unknown
++ xenstore-read /local/domain/5/vm
bridge xenbr1 does not exist!
+ FRONTEND_UUID=/vm/4e2612fa-d832-b56e-661a-833fa4b8aa72
+ claim_lock block
+ local lockdir=/var/run/xen-hotplug/block
+ mkdir -p /var/run/xen-hotplug
+ _claim_lock /var/run/xen-hotplug/block
+ local lockdir=/var/run/xen-hotplug/block
++ _lock_owner /var/run/xen-hotplug/block
++ cat /var/run/xen-hotplug/block/owner
++ echo unknown
+ local owner=unknown
+ local retries=0
+ '[' 0 -lt 100 ']'
+ mkdir /var/run/xen-hotplug/block
+ trap 'release_lock /var/run/xen-hotplug/block; sigerr' ERR
+ _update_lock_info /var/run/xen-hotplug/block
+ echo '12596: /etc/xen/scripts/block'
+ return
+ check_device_sharing /dev/lvm-vg1/vm-otrs-test w
+ local dev=/dev/lvm-vg1/vm-otrs-test
++ canonicalise_mode w
++ local mode=w
++ expr index w w
++ expr index w '!'
++ echo w
+ local mode=w
+ local result
+ '[' w == '!' ']'
++ check_sharing /dev/lvm-vg1/vm-otrs-test w
++ local dev=/dev/lvm-vg1/vm-otrs-test
++ local mode=w
+++ device_major_minor /dev/lvm-vg1/vm-otrs-test
+++ stat -L -c %t:%T /dev/lvm-vg1/vm-otrs-test
++ local devmm=fe:1
++ local file
++ '[' w == w ']'
++ toskip='^$'
+++ cat /proc/mounts
+++ grep -v '^$'
+++ cut -f 1 -d ' '
++ for file in '$(cat /proc/mounts | grep -v "$toskip" | cut -f 1 -d '\'' '\'')'
++ '[' -e rootfs ']'
++ for file in '$(cat /proc/mounts | grep -v "$toskip" | cut -f 1 -d '\'' '\'')'
++ '[' -e none ']'
++ for file in '$(cat /proc/mounts | grep -v "$toskip" | cut -f 1 -d '\'' '\'')'
++ '[' -e none ']'
++ for file in '$(cat /proc/mounts | grep -v "$toskip" | cut -f 1 -d '\'' '\'')'
++ '[' -e udev ']'
++ for file in '$(cat /proc/mounts | grep -v "$toskip" | cut -f 1 -d '\'' '\'')'
++ '[' -e /dev/sda5 ']'
+++ device_major_minor /dev/sda5
+++ stat -L -c %t:%T /dev/sda5
++ local d=8:5
++ '[' 8:5 == fe:1 ']'
++ for file in '$(cat /proc/mounts | grep -v "$toskip" | cut -f 1 -d '\'' '\'')'
++ '[' -e /dev/sda5 ']'
+++ device_major_minor /dev/sda5
+++ stat -L -c %t:%T /dev/sda5
++ local d=8:5
++ '[' 8:5 == fe:1 ']'
++ for file in '$(cat /proc/mounts | grep -v "$toskip" | cut -f 1 -d '\'' '\'')'
++ '[' -e tmpfs ']'
++ for file in '$(cat /proc/mounts | grep -v "$toskip" | cut -f 1 -d '\'' '\'')'
++ '[' -e usbfs ']'
++ for file in '$(cat /proc/mounts | grep -v "$toskip" | cut -f 1 -d '\'' '\'')'
++ '[' -e tmpfs ']'
++ for file in '$(cat /proc/mounts | grep -v "$toskip" | cut -f 1 -d '\'' '\'')'
++ '[' -e devpts ']'
++ for file in '$(cat /proc/mounts | grep -v "$toskip" | cut -f 1 -d '\'' '\'')'
++ '[' -e /dev/sda2 ']'
+++ device_major_minor /dev/sda2
+++ stat -L -c %t:%T /dev/sda2
++ local d=8:2
++ '[' 8:2 == fe:1 ']'
++ local base_path=backend/vbd
+++ xenstore-list backend/vbd
++ for dom in '$(xenstore-list "$base_path")'
+++ xenstore-list backend/vbd/5
++ for dev in '$(xenstore-list "$base_path/$dom")'
+++ xenstore_read_default backend/vbd/5/2049/physical-device ''
+++ xenstore-read backend/vbd/5/2049/physical-device
+++ echo ''
++ d=
++ '[' '' == fe:1 ']'
++ echo ok
+ result=ok
+ '[' ok '!=' ok ']'
+ write_dev /dev/lvm-vg1/vm-otrs-test
+ local mm
++ device_major_minor /dev/lvm-vg1/vm-otrs-test
++ stat -L -c %t:%T /dev/lvm-vg1/vm-otrs-test
+ mm=fe:1
+ '[' -z fe:1 ']'
+ xenstore_write backend/vbd/5/2049/physical-device fe:1
+ log debug 'Writing backend/vbd/5/2049/physical-device' 'fe:1 to xenstore.'
+ local level=debug
+ shift
+ logger -p daemon.debug -- /etc/xen/scripts/block: 'Writing
backend/vbd/5/2049/physical-device' 'fe:1 to xenstore.'
+ xenstore-write backend/vbd/5/2049/physical-device fe:1
+ success
+ xenstore_write backend/vbd/5/2049/hotplug-status connected
+ log debug 'Writing backend/vbd/5/2049/hotplug-status' 'connected to xenstore.'
+ local level=debug
+ shift
+ logger -p daemon.debug -- /etc/xen/scripts/block: 'Writing
backend/vbd/5/2049/hotplug-status' 'connected to xenstore.'
+ xenstore-write backend/vbd/5/2049/hotplug-status connected
+ release_lock block
+ _release_lock /var/run/xen-hotplug/block
+ trap sigerr ERR
+ rm -rf /var/run/xen-hotplug/block
+ exit 0
+++ export
PATH=/sbin:/bin:/usr/bin:/usr/sbin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
+++
PATH=/sbin:/bin:/usr/bin:/usr/sbin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
+++ export LANG=POSIX
+++ LANG=POSIX
++++ grep '^LC_'
++++ cut -d= -f1
++++ set
+++ unset
+++ trap sigerr ERR
+++ log debug offline XENBUS_PATH=backend/vif/5/0
+++ local level=debug
+++ shift
+++ logger -p daemon.debug -- /etc/xen/scripts/vif-bridge: offline
XENBUS_PATH=backend/vif/5/0
++ . /etc/xen/scripts/xen-network-common.sh
+++ '[' -e /etc/SuSE-release ']'
+++ which ifup
++ findCommand offline
++ for arg in '"$@"'
++ expr index offline =
++ command=offline
++ return
++ '[' offline '!=' online ']'
++ '[' offline '!=' offline ']'
++ case "$command" in
++ evalVariables offline
++ for arg in '"$@"'
++ expr index offline = '>' 1
++ ip=
+++ xenstore_read_default backend/vif/5/0/ip ''
+++ xenstore-read backend/vif/5/0/ip
+++ export
PATH=/sbin:/bin:/usr/bin:/usr/sbin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
+++
PATH=/sbin:/bin:/usr/bin:/usr/sbin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
+++ export LANG=POSIX
+++ LANG=POSIX
++++ set
++++ grep '^LC_'
++++ cut -d= -f1
+++ unset
+++ trap sigerr ERR
+++ log debug remove XENBUS_PATH=backend/vbd/5/2049
+++ local level=debug
+++ shift
+++ logger -p daemon.debug -- /etc/xen/scripts/block: remove
XENBUS_PATH=backend/vbd/5/2049
++ findCommand remove
++ for arg in '"$@"'
++ expr index remove =
++ command=remove
++ return
++ '[' remove '!=' add ']'
++ '[' remove '!=' remove ']'
++ XENBUS_PATH=backend/vbd/5/2049
++ xenstore_read_default backend/vbd/5/2049/type MISSING
++ xenstore-read backend/vbd/5/2049/type
++ ip=10.1.19.20
++ XENBUS_PATH=backend/vif/5/0
++ vif=vif5.0
+++ xenstore_read_default backend/vif/5/0/vifname ''
+++ xenstore-read backend/vif/5/0/vifname
+ t=phy
+ case "$command" in
+ case $t in
+ exit 0
+++ echo ''
++ vifname=
++ '[' '' ']'
+ bridge=
++ xenstore_read_default backend/vif/5/0/bridge ''
++ xenstore-read backend/vif/5/0/bridge
++ export
PATH=/sbin:/bin:/usr/bin:/usr/sbin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
++
PATH=/sbin:/bin:/usr/bin:/usr/sbin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
++ export LANG=POSIX
++ LANG=POSIX
+++ set
+++ grep '^LC_'
+++ cut -d= -f1
++ unset
++ trap sigerr ERR
++ log debug XENBUS_PATH=backend/vbd/5/2049
++ local level=debug
++ shift
++ logger -p daemon.debug -- /etc/xen/scripts/xen-hotplug-cleanup:
XENBUS_PATH=backend/vbd/5/2049
+ claim_lock block
+ local lockdir=/var/run/xen-hotplug/block
+ mkdir -p /var/run/xen-hotplug
+ _claim_lock /var/run/xen-hotplug/block
+ local lockdir=/var/run/xen-hotplug/block
++ _lock_owner /var/run/xen-hotplug/block
++ cat /var/run/xen-hotplug/block/owner
++ echo unknown
+ local owner=unknown
+ local retries=0
+ '[' 0 -lt 100 ']'
+ mkdir /var/run/xen-hotplug/block
+ trap 'release_lock /var/run/xen-hotplug/block; sigerr' ERR
+ _update_lock_info /var/run/xen-hotplug/block
+ echo '12842: /etc/xen/scripts/xen-hotplug-cleanup'
+ return
++ xenstore-read backend/vbd/5/2049/frontend
+ bridge=xenbr1
+ '[' -z xenbr1 ']'
+ case "$command" in
+ do_without_error brctl delif xenbr1 vif5.0
+ brctl delif xenbr1 vif5.0
+ xenstore-rm -t /local/domain/5/device/vbd/2049
+ log debug brctl delif xenbr1 'vif5.0 failed'
+ local level=debug
+ shift
+ logger -p daemon.debug -- /etc/xen/scripts/vif-bridge: brctl delif xenbr1
'vif5.0 failed'
+ do_without_error ifconfig vif5.0 down
+ ifconfig vif5.0 down
+ true
+ xenstore-rm -t backend/vbd/5/2049
+ log debug ifconfig vif5.0 'down failed'
+ local level=debug
+ shift
+ logger -p daemon.debug -- /etc/xen/scripts/vif-bridge: ifconfig vif5.0 'down
failed'
+ handle_iptable
+ iptables -L -n
+ '[' 10.1.19.20 '!=' '' ']'
+ local addr
+ for addr in '"$ip"'
+ frob_iptable -s 10.1.19.20
+ '[' offline == online ']'
+ local c=-D
+ iptables -D FORWARD -m physdev --physdev-in vif5.0 -s 10.1.19.20 -j ACCEPT
+ '[' -D == -D ']'
+ frob_iptable -p udp --sport 68 --dport 67
+ '[' offline == online ']'
+ local c=-D
+ iptables -D FORWARD -m physdev --physdev-in vif5.0 -p udp --sport 68 --dport
67 -j ACCEPT
+ xenstore-rm -t error/backend/vbd/5/2049
+ '[' -D == -D ']'
+ log debug 'Successful vif-bridge offline for vif5.0, bridge xenbr1.'
+ local level=debug
+ shift
+ logger -p daemon.debug -- /etc/xen/scripts/vif-bridge: 'Successful vif-bridge
offline for vif5.0, bridge xenbr1.'
+ '[' offline == online ']'
++ export
PATH=/sbin:/bin:/usr/bin:/usr/sbin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
++
PATH=/sbin:/bin:/usr/bin:/usr/sbin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
++ export LANG=POSIX
++ LANG=POSIX
+++ set
+++ grep '^LC_'
+ true
+ release_lock block
+ _release_lock /var/run/xen-hotplug/block
+ trap sigerr ERR
+ rm -rf /var/run/xen-hotplug/block
+++ cut -d= -f1
++ unset
++ trap sigerr ERR
++ log debug XENBUS_PATH=backend/vif/5/0
++ local level=debug
++ shift
++ logger -p daemon.debug -- /etc/xen/scripts/xen-hotplug-cleanup:
XENBUS_PATH=backend/vif/5/0
+ claim_lock block
+ local lockdir=/var/run/xen-hotplug/block
+ mkdir -p /var/run/xen-hotplug
+ _claim_lock /var/run/xen-hotplug/block
+ local lockdir=/var/run/xen-hotplug/block
++ _lock_owner /var/run/xen-hotplug/block
++ cat /var/run/xen-hotplug/block/owner
++ echo unknown
+ local owner=unknown
+ local retries=0
+ '[' 0 -lt 100 ']'
+ mkdir /var/run/xen-hotplug/block
+ trap 'release_lock /var/run/xen-hotplug/block; sigerr' ERR
+ _update_lock_info /var/run/xen-hotplug/block
+ echo '12904: /etc/xen/scripts/xen-hotplug-cleanup'
+ return
++ xenstore-read backend/vif/5/0/frontend
+ xenstore-rm -t /local/domain/5/device/vif/0
+ true
+ xenstore-rm -t backend/vif/5/0
+ xenstore-rm -t error/backend/vif/5/0
+ true
+ release_lock block
+ _release_lock /var/run/xen-hotplug/block
+ trap sigerr ERR
+ rm -rf /var/run/xen-hotplug/block
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