libvirt users - Oct 2012 - Failed to query file context on : No data available

Hi:I downloaded a cirros-0.3.0-x86_64-rootfs.img and mount it to /tmp/bak
then I edit a xml file ,here is the content:


<domain type='lxc'>
  <name>vm1</name>
  <memory>500000</memory>
  <os>
    <type>exe</type>
    <init>/bin/sh</init>
  </os>
  <vcpu>1</vcpu>
  <clock offset='utc'/>
  <on_poweroff>destroy</on_poweroff>
  <on_reboot>restart</on_reboot>
  <on_crash>destroy</on_crash>
  <devices>
    <emulator>/usr/libexec/libvirt_lxc</emulator>
    <filesystem type='mount'>
      <source dir='/tmp/bak'/>
      <target dir='/'/>
    </filesystem>
    <interface type='network'>
      <source network='default'/>
    </interface>
    <console type='pty' />
  </devices>
</domain>


I defined it and no error , but when I start it , it comes with 
error: Failed to start domain vm1
error: internal error guest failed to start: 2012-10-24 13:08:14.684+0000:
16935: info : libvirt version: 0.9.10, package: 21.el6_3.4 (CentOS BuildSystem
<http://bugs.centos.org>, 2012-08-23-18:28:26, c6b9.bsys.dev.centos.org)
2012-10-24 13:08:14.684+0000: 16935: error : lxcControllerRun:1484 : Failed to
query file context on /tmp/bak: No data available



here is the ls -al /tmp/bak
total 92
drwxr-xr-x  21 root root 4096 Oct 24 20:43 .
drwxrwxrwt.  5 root root 4096 Oct 24 21:08 ..
drwxr-xr-x   2 root root 4096 Oct 24 20:43 bin
drwxr-xr-x   3 root root 4096 Oct 24 20:43 boot
drwxr-xr-x   3 root root 4096 Oct 24 20:43 dev
drwxr-xr-x   7 root root 4096 Oct 24 20:43 etc
drwxr-xr-x   4 root root 4096 Oct 24 20:43 home
-rwxr-xr-x   1 root root 2785 Oct 24 20:43 init
lrwxrwxrwx   1 root root   32 Oct 24 20:43 initrd.img ->
boot/initrd.img-3.0.0-12-virtual
drwxr-xr-x   4 root root 4096 Oct 24 20:43 lib
lrwxrwxrwx   1 root root   11 Oct 24 20:43 linuxrc -> bin/busybox
drwx------   2 root root 4096 Oct 24 20:43 lost+found
drwxr-xr-x   2 root root 4096 Oct 24 20:43 mnt
drwxr-xr-x   2 root root 4096 Oct 24 20:43 .oldroot
drwxr-xr-x   2 root root 4096 Oct 24 20:43 old-root
drwxr-xr-x   2 root root 4096 Oct 24 20:43 opt
drwxr-xr-x   2 root root 4096 Oct 24 20:43 proc
drwx------   2 root root 4096 Oct 24 20:43 root
drwxr-xr-x   2 root root 4096 Oct 24 20:43 run
drwxr-xr-x   2 root root 4096 Oct 24 20:43 sbin
drwxr-xr-x   2 root root 4096 Oct 24 20:43 sys
drwxr-xr-t   3 root root 4096 Oct 24 20:43 tmp
drwxr-xr-x   6 root root 4096 Oct 24 20:43 usr
drwxr-xr-x   8 root root 4096 Oct 24 20:43 var
lrwxrwxrwx   1 root root   29 Oct 24 20:43 vmlinuz ->
boot/vmlinuz-3.0.0-12-virtual



How can I  solve this problem? 


Thanks :-)
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