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[Wenzhi Yu <wenzhi_yu@xxxxxxx>]

@Robin, it seems this commit[1] had already solved this issue, please
reopen this bug if I was wrong.

[1]https://github.com/openstack/nova/commit/04b7c27dfb446cfce508db32643bed3220b117b1

** Changed in: nova
       Status: In Progress => Invalid

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https://bugs.launchpad.net/bugs/1575598

Title:
  ComputeTaskManager.build_instances exception handling can fail

Status in OpenStack Compute (nova):
  Invalid

Bug description:
  
  If a MaxRetriesExceeded exception is raised by scheduler_utils.populate_retry then request_spec will be undefined in the exception handler, see: https://git.openstack.org/cgit/openstack/nova/tree/nova/conductor/manager.py#n422

  This was introduced by moving the initialization of request_spec
  inside the try block in
  https://git.openstack.org/cgit/openstack/nova/commit/nova/conductor/manager.py?id=399f3abbf9da6ba9f3ae83650513616b151420cb

  Simply moving the initialization of request_spec up one line before
  the call to populate_retry should fix the issue.

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