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[Matt Riedemann <mriedem@xxxxxxxxxx>]

** Also affects: nova/newton
   Importance: Undecided
       Status: New

** Changed in: nova/newton
       Status: New => Confirmed

** Changed in: nova
   Importance: Undecided => High

** Changed in: nova/newton
   Importance: Undecided => High

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https://bugs.launchpad.net/bugs/1636109

Title:
  Reschedule of a virtual machine fails with  'NetworkInfo' object has
  no 'wait'

Status in OpenStack Compute (nova):
  In Progress
Status in OpenStack Compute (nova) newton series:
  Confirmed

Bug description:
  When a virtual machine is rescheduled and fails eith some storage exception, getting an error that
  'NetworkInfo' object has no attribute 'wait' instead of actual storage issue

  In nova/compute/manager

  https://github.com/openstack/nova/blob/master/nova/compute/manager.py#L2088
  is actually throwing above exception because , network_info is a
  'NetworkInfoAsyncWrapper' object in first time deploy case and
  'NetworkInfo' object in a reschedule case, so during reschedule it is
  throwing 'wait' attribute is not there.

   def _build_networks_for_instance(self, context, instance,
              requested_networks, security_groups):

          # If we're here from a reschedule the network may already be allocated.
          if strutils.bool_from_string(
                  instance.system_metadata.get('network_allocated', 'False')):
              # NOTE(alex_xu): The network_allocated is True means the network
              # resource already allocated at previous scheduling, and the
              # network setup is cleanup at previous. After rescheduling, the
              # network resource need setup on the new host.
              self.network_api.setup_instance_network_on_host(
                  context, instance, instance.host)
              return self.network_api.get_instance_nw_info(context, instance)   --------  this block gets called for reschedule case which returns NetworkInfo object

          if not self.is_neutron_security_groups:
              security_groups = []

          macs = self.driver.macs_for_instance(instance)
          dhcp_options = self.driver.dhcp_options_for_instance(instance)
          network_info = self._allocate_network(context, instance,
                  requested_networks, macs, security_groups, dhcp_options)  ----------------- this block is called for deploy on first host which returns NetworkInfoAsyncWrapper which has wait.

          return network_info

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