Created attachment 524275 [details]
virt-manager.log

Description of problem:

Could not start virtual network 'default': internal error Child process (/usr/sbin/dnsmasq --strict-order --bind-interfaces --pid-file=/var/run/libvirt/network/default.pid --conf-file= --except-interface lo --listen-address 192.168.122.1 --dhcp-range 192.168.122.2,192.168.122.254 --dhcp-leasefile=/var/lib/libvirt/dnsmasq/default.leases --dhcp-lease-max=253 --dhcp-no-override) status unexpected: exit status 2

Traceback (most recent call last):
  File "/usr/share/virt-manager/virtManager/uihelpers.py", line 631, in validate_network
    virnet.create()
  File "/usr/lib64/python2.7/site-packages/libvirt.py", line 1452, in create
    if ret == -1: raise libvirtError ('virNetworkCreate() failed', net=self)
libvirtError: internal error Child process (/usr/sbin/dnsmasq --strict-order --bind-interfaces --pid-file=/var/run/libvirt/network/default.pid --conf-file= --except-interface lo --listen-address 192.168.122.1 --dhcp-range 192.168.122.2,192.168.122.254 --dhcp-leasefile=/var/lib/libvirt/dnsmasq/default.leases --dhcp-lease-max=253 --dhcp-no-override) status unexpected: exit status 2

Version-Release number of selected component (if applicable):
* virt-manager-0.9.0-5.fc16.noarch
* dnsmasq-2.58-2.fc16.x86_64

How reproducible:
Always

Steps to Reproduce:
1. Add new vm (e.g. Fedora 16 Beta rc1)
2. At step 5 of 5 a message appears that the network can not be started
3. Press Finish (the above message appears in a message box)
  
Actual results:
new VM can not be created

Expected results:
new VM is created.

Additional info:
I've added the version of dnsmasq because it can also be the culprit (internal error Child process).