Hello,
I get this error whenever I try to  launch a VM  (log is attached)
I have last dev-stack installed on bare-metal (fedora24)
Who can assist ?
Regards avi
2017-03-07 14:08:28.284 TRACE nova.compute.manager ^[[01;35m[instance: 
416d0d89-c786-435c-8fd1-85acd857b220] ^[[00mTraceback (most recent call last):
2017-03-07 14:08:28.284 TRACE nova.compute.manager ^[[01;35m[instance: 
416d0d89-c786-435c-8fd1-85acd857b220] ^[[00m  File 
"/opt/stack/nova/nova/compute/manager.py", line 2124, in _build_resources
2017-03-07 14:08:28.284 TRACE nova.compute.manager ^[[01;35m[instance: 
416d0d89-c786-435c-8fd1-85acd857b220] ^[[00m    yield resources
2017-03-07 14:08:28.284 TRACE nova.compute.manager ^[[01;35m[instance: 
416d0d89-c786-435c-8fd1-85acd857b220] ^[[00m  File 
"/opt/stack/nova/nova/compute/manager.py", line 1929, in _build_and_run_instance
2017-03-07 14:08:28.284 TRACE nova.compute.manager ^[[01;35m[instance: 
416d0d89-c786-435c-8fd1-85acd857b220] ^[[00m    
block_device_info=block_device_info)
2017-03-07 14:08:28.284 TRACE nova.compute.manager ^[[01;35m[instance: 
416d0d89-c786-435c-8fd1-85acd857b220] ^[[00m  File 
"/opt/stack/nova/nova/virt/libvirt/driver.py", line 2665, in spawn
2017-03-07 14:08:28.284 TRACE nova.compute.manager ^[[01;35m[instance: 
416d0d89-c786-435c-8fd1-85acd857b220] ^[[00m    destroy_disks_on_failure=True)
2017-03-07 14:08:28.284 TRACE nova.compute.manager ^[[01;35m[instance: 
416d0d89-c786-435c-8fd1-85acd857b220] ^[[00m  File 
"/opt/stack/nova/nova/virt/libvirt/driver.py", line 5068, in 
_create_domain_and_network
2017-03-07 14:08:28.284 TRACE nova.compute.manager ^[[01;35m[instance: 
416d0d89-c786-435c-8fd1-85acd857b220] ^[[00m    destroy_disks_on_failure)
2017-03-07 14:08:28.284 TRACE nova.compute.manager ^[[01;35m[instance: 
416d0d89-c786-435c-8fd1-85acd857b220] ^[[00m  File 
"/usr/lib/python2.7/site-packages/oslo_utils/excutils.py", line 220, in __exit__
2017-03-07 14:08:28.284 TRACE nova.compute.manager ^[[01;35m[instance: 
416d0d89-c786-435c-8fd1-85acd857b220] ^[[00m    self.force_reraise()
2017-03-07 14:08:28.284 TRACE nova.compute.manager ^[[01;35m[instance: 
416d0d89-c786-435c-8fd1-85acd857b220] ^[[00m  File 
"/usr/lib/python2.7/site-packages/oslo_utils/excutils.py", line 196, in 
force_reraise
2017-03-07 14:08:28.284 TRACE nova.compute.manager ^[[01;35m[instance: 
416d0d89-c786-435c-8fd1-85acd857b220] ^[[00m    six.reraise(self.type_, 
self.value, self.tb)
2017-03-07 14:08:28.284 TRACE nova.compute.manager ^[[01;35m[instance: 
416d0d89-c786-435c-8fd1-85acd857b220] ^[[00m  File 
"/opt/stack/nova/nova/virt/libvirt/driver.py", line 5040, in 
_create_domain_and_network
2017-03-07 14:08:28.284 TRACE nova.compute.manager ^[[01;35m[instance: 
416d0d89-c786-435c-8fd1-85acd857b220] ^[[00m    
post_xml_callback=post_xml_callback)
2017-03-07 14:08:28.284 TRACE nova.compute.manager ^[[01;35m[instance: 
416d0d89-c786-435c-8fd1-85acd857b220] ^[[00m  File 
"/opt/stack/nova/nova/virt/libvirt/driver.py", line 4958, in _create_domain
2017-03-07 14:08:28.284 TRACE nova.compute.manager ^[[01;35m[instance: 
416d0d89-c786-435c-8fd1-85acd857b220] ^[[00m    guest.launch(pause=pause)
2017-03-07 14:08:28.284 TRACE nova.compute.manager ^[[01;35m[instance: 
416d0d89-c786-435c-8fd1-85acd857b220] ^[[00m  File 
"/opt/stack/nova/nova/virt/libvirt/guest.py", line 145, in launch
2017-03-07 14:08:28.284 TRACE nova.compute.manager ^[[01;35m[instance: 
416d0d89-c786-435c-8fd1-85acd857b220] ^[[00m    self._encoded_xml, 
errors='ignore')
2017-03-07 14:08:28.284 TRACE nova.compute.manager ^[[01;35m[instance: 
416d0d89-c786-435c-8fd1-85acd857b220] ^[[00m  File 
"/usr/lib/python2.7/site-packages/oslo_utils/excutils.py", line 220, in __exit__
2017-03-07 14:08:28.284 TRACE nova.compute.manager ^[[01;35m[instance: 
416d0d89-c786-435c-8fd1-85acd857b220] ^[[00m    self.force_reraise()
2017-03-07 14:08:28.284 TRACE nova.compute.manager ^[[01;35m[instance: 
416d0d89-c786-435c-8fd1-85acd857b220] ^[[00m  File 
"/usr/lib/python2.7/site-packages/oslo_utils/excutils.py", line 196, in 
force_reraise
2017-03-07 14:08:28.284 TRACE nova.compute.manager ^[[01;35m[instance: 
416d0d89-c786-435c-8fd1-85acd857b220] ^[[00m    six.reraise(self.type_, 
self.value, self.tb)
2017-03-07 14:08:28.284 TRACE nova.compute.manager ^[[01;35m[instance: 
416d0d89-c786-435c-8fd1-85acd857b220] ^[[00m  File 
"/opt/stack/nova/nova/virt/libvirt/guest.py", line 140, in launch
2017-03-07 14:08:28.284 TRACE nova.compute.manager ^[[01;35m[instance: 
416d0d89-c786-435c-8fd1-85acd857b220] ^[[00m    return 
self._domain.createWithFlags(flags)
2017-03-07 14:08:28.284 TRACE nova.compute.manager ^[[01;35m[instance: 
416d0d89-c786-435c-8fd1-85acd857b220] ^[[00m  File 
"/usr/lib/python2.7/site-packages/eventlet/tpool.py", line 186, in doit
2017-03-07 14:08:28.284 TRACE nova.compute.manager ^[[01;35m[instance: 
416d0d89-c786-435c-8fd1-85acd857b220] ^[[00m    result = 
proxy_call(self._autowrap, f, *args, **kwargs)
2017-03-07 14:08:28.284 TRACE nova.compute.manager ^[[01;35m[instance: 
416d0d89-c786-435c-8fd1-85acd857b220] ^[[00m  File 
"/usr/lib/python2.7/site-packages/eventlet/tpool.py", line 144, in proxy_call
2017-03-07 14:08:28.284 TRACE nova.compute.manager ^[[01;35m[instance: 
416d0d89-c786-435c-8fd1-85acd857b220] ^[[00m    rv = execute(f, *args, **kwargs)
2017-03-07 14:08:28.284 TRACE nova.compute.manager ^[[01;35m[instance: 
416d0d89-c786-435c-8fd1-85acd857b220] ^[[00m  File 
"/usr/lib/python2.7/site-packages/eventlet/tpool.py", line 125, in execute
2017-03-07 14:08:28.284 TRACE nova.compute.manager ^[[01;35m[instance: 
416d0d89-c786-435c-8fd1-85acd857b220] ^[[00m    six.reraise(c, e, tb)
2017-03-07 14:08:28.284 TRACE nova.compute.manager ^[[01;35m[instance: 
416d0d89-c786-435c-8fd1-85acd857b220] ^[[00m  File 
"/usr/lib/python2.7/site-packages/eventlet/tpool.py", line 83, in tworker
2017-03-07 14:08:28.284 TRACE nova.compute.manager ^[[01;35m[instance: 
416d0d89-c786-435c-8fd1-85acd857b220] ^[[00m    rv = meth(*args, **kwargs)
2017-03-07 14:08:28.284 TRACE nova.compute.manager ^[[01;35m[instance: 
416d0d89-c786-435c-8fd1-85acd857b220] ^[[00m  File 
"/usr/lib64/python2.7/site-packages/libvirt.py", line 1065, in createWithFlags
2017-03-07 14:08:28.284 TRACE nova.compute.manager ^[[01;35m[instance: 
416d0d89-c786-435c-8fd1-85acd857b220] ^[[00m    if ret == -1: raise 
libvirtError ('virDomainCreateWithFlags() failed', dom=self)
2017-03-07 14:08:28.284 TRACE nova.compute.manager ^[[01;35m[instance: 
416d0d89-c786-435c-8fd1-85acd857b220] ^[[00mlibvirtError: internal error: 
Unable to add port tap2839d93e-e2 to OVS bridge br-int
2017-03-07 14:08:28.284 TRACE nova.compute.manager ^[[01;35m[instance: 
416d0d89-c786-435c-8fd1-85acd857b220] ^[[00m

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