Created attachment 1278802 [details]
artifacts

Description of problem:
When a VM with OVN network attached tries to start on host without OVN bridge, it starts as paused, and doesn't show any error in engine.

This is what is written in the vdsm.log:
17-05-15 09:39:35,277+0300 INFO  (vm/69687cda) [virt.vm] (vmId='69687cda-ed1a-437b-b270-0b3c2134d0f7') Skipping errors on recovery (vm:651)
Traceback (most recent call last):
  File "/usr/share/vdsm/virt/vm.py", line 639, in _startUnderlyingVm
    self._run()
  File "/usr/share/vdsm/virt/vm.py", line 2166, in _run
    self._connection.createXML(domxml, flags),
  File "/usr/lib/python2.7/site-packages/vdsm/libvirtconnection.py", line 123, in wrapper
    ret = f(*args, **kwargs)
  File "/usr/lib/python2.7/site-packages/vdsm/utils.py", line 921, in wrapper
    return func(inst, *args, **kwargs)
  File "/usr/lib64/python2.7/site-packages/libvirt.py", line 3777, in createXML
    if ret is None:raise libvirtError('virDomainCreateXML() failed', conn=self)
libvirtError: Cannot get interface MTU on 'br-int': No such device


Version-Release number of selected component (if applicable):
oVirt Engine Version: 4.2.0-0.0.master.20170503135127.git43302b6.el7.centos

How reproducible:
100%

Steps to Reproduce:
1. Start VM with OVN network on host without OVN bridge (br-int).

Actual results:
VM starts as paused.

Expected results:
Engine should show error regarding the missing bridge on host, and VM shouldn't be in paused state.

Additional info: