libvirt users - Aug 2012 - error: virsh not could create bridge interface

hello,

virsh iface-bridge to build bridge interface does not work for me,i've
searched in google but got nothing ,please give some help,thanks.


# VIRSH_DEBUG=0 VIRSH_LOG_FILE=bridge.log virsh iface-bridge eth0 br0
iface-bridge: found option <interface>: eth0
iface-bridge: <interface> trying as interface NAME
libvir: Interface error : Interface not found: couldn't find interface
named 'br0'
libvir: Interface error : internal error could not get interface XML
description: XSLT transformation failed - runtime error: file
/usr/share/netcf/xml/initscripts-get.xsl line 196 element node
error: Failed to define new bridge interface br0
error: internal error could not get interface XML description: XSLT
transformation failed - runtime error: file
/usr/share/netcf/xml/initscripts-get.xsl line 196 element node

# virsh version
Compiled against library: libvir 0.9.10
Using library: libvir 0.9.10
Using API: QEMU 0.9.10
Running hypervisor: QEMU 0.12.1

# cat bridge.log
[2012.08.16 16:16:50 virsh 10895] INFO iface-bridge: found option
<interface>: eth0
[2012.08.16 16:16:50 virsh 10895] DEBUG iface-bridge: <interface>
trying as interface NAME
[2012.08.16 16:16:50 virsh 10895] ERROR Failed to define new bridge
interface br0
[2012.08.16 16:16:50 virsh 10895] ERROR internal error could not get
interface XML description: XSLT transformation failed - runtime error:
file /usr/share/netcf/xml/initscripts-get.xsl line 196 element node


this is some debug log from /var/log/libvirt/libvirtd.log:


2012-08-16 08:54:25.724+0000: 11526: debug :
virInterfaceDefineXML:10794 : conn=0x7f963c0009c0, xml=<?xml
version="1.0"?>
<interface type="bridge" name="br0">
  <start mode="onboot"/>

  <protocol family="ipv4">
    <ip address="118.123.12.65" prefix="25"/>
    <route gateway="118.123.12.1"/>
  </protocol>
<bridge stp="on" delay="0"><interface
type="ethernet" name="eth0"><mac
address="00:30:48:D9:F7:EE"/></interface></bridge></interface>
, flags=0
2012-08-16 08:54:25.724+0000: 11523: debug :
virEventPollCleanupTimeouts:506 : Cleanup 3
2012-08-16 08:54:25.724+0000: 11523: debug :
virEventPollCleanupHandles:554 : Cleanup 8
2012-08-16 08:54:25.724+0000: 11523: debug :
virEventPollMakePollFDs:383 : Prepare n=0 w=1, f=7 e=1 d=0
2012-08-16 08:54:25.724+0000: 11523: debug :
virEventPollMakePollFDs:383 : Prepare n=1 w=2, f=9 e=1 d=0
2012-08-16 08:54:25.724+0000: 11523: debug :
virEventPollMakePollFDs:383 : Prepare n=2 w=3, f=12 e=1 d=0
2012-08-16 08:54:25.724+0000: 11523: debug :
virEventPollMakePollFDs:383 : Prepare n=3 w=4, f=13 e=1 d=0
2012-08-16 08:54:25.724+0000: 11523: debug :
virEventPollMakePollFDs:383 : Prepare n=4 w=5, f=6 e=1 d=0
2012-08-16 08:54:25.724+0000: 11523: debug :
virEventPollMakePollFDs:383 : Prepare n=5 w=6, f=16 e=1 d=0
2012-08-16 08:54:25.724+0000: 11523: debug :
virEventPollMakePollFDs:383 : Prepare n=6 w=7, f=15 e=1 d=0
2012-08-16 08:54:25.724+0000: 11523: debug :
virEventPollMakePollFDs:383 : Prepare n=7 w=8, f=17 e=1 d=0
2012-08-16 08:54:25.724+0000: 11523: debug :
virEventPollCalculateTimeout:325 : Calculate expiry of 3 timers
2012-08-16 08:54:25.724+0000: 11523: debug :
virEventPollCalculateTimeout:351 : Timeout at 0 due in -1 ms
2012-08-16 08:54:25.724+0000: 11523: debug : virEventPollRunOnce:619 :
EVENT_POLL_RUN: nhandles=8 imeout=-1
2012-08-16 08:54:25.730+0000: 11526: error : interfaceDefineXML:425 :
internal error could not get interface XML description: XSLT
transformation failed - runtime error: file
/usr/share/netcf/xml/initscripts-get.xsl line 196 element node


thanks.