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    Hello,<br>
    after upgrade to 3.6 virtual machine with hostusb vdsm hook attached
    cannot be started:<br>
    <br>
    <tt><small><big>Thread-2194::ERROR::2015-11-12
          21:21:16,527::vm::751::virt.vm::(_startUnderlyingVm)
          vmId=`ec7cde24-ac17-453c-a0d3-1873993b80e1`::The vm start
          process failed<br>
          Traceback (most recent call last):<br>
            File "/usr/share/vdsm/virt/vm.py", line 695, in
          _startUnderlyingVm<br>
              self._run()<br>
            File "/usr/share/vdsm/virt/vm.py", line 1876, in _run<br>
              self._domDependentInit()<br>
            File "/usr/share/vdsm/virt/vm.py", line 1733, in
          _domDependentInit<br>
              self._getUnderlyingVmDevicesInfo()<br>
            File "/usr/share/vdsm/virt/vm.py", line 1682, in
          _getUnderlyingVmDevicesInfo<br>
              self._getUnderlyingHostDeviceInfo()<br>
            File "/usr/share/vdsm/virt/vm.py", line 4106, in
          _getUnderlyingHostDeviceInfo<br>
              if device_type == 'usb':<br>
            File "/usr/share/vdsm/virt/vm.py", line 4092, in
          _getUnderlyingHostDeviceUSBInfo<br>
              for dev in self.conf['devices']:<br>
          UnboundLocalError: local variable 'device' referenced before
          assignment<br>
          Thread-2194::INFO::2015-11-12
          21:21:16,546::vm::1278::virt.vm::(setDownStatus)
          vmId=`ec7cde24-ac17-453c-a0d3-1873993b80e1`::Changed state to
          Down: local variable 'device' referenced before assignment
          (code=1)</big><br>
      </small></tt><br>
    Corresponding xml entry present in vm start config:<br>
    <br>
    <small>        &lt;hostdev mode="subsystem"
      type="usb"&gt;&lt;source&gt;&lt;vendor id="0x14a8"/&gt;&lt;product
      id="0x0001"/&gt;&lt;/source&gt;&lt;/hostdev&gt;&lt;/devices&gt;</small><br>
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