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[Bug 1550795] [NEW] live migration with block migration on Xen produces "cannot marshal" exception

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Public bug reported:

1. Nova version

commit ce5a2fb419f999bec0fb2c67413387c8b67a691a

2. Deserialized traceback as captured in log as received by messaging

Traceback (most recent call last):
  File "/opt/rackstack/rackstack.532.2/nova/lib/python2.7/site-packages/oslo_messaging/rpc/dispatcher.py", line 143, in _dispatch_and_reply
    executor_callback))
  File "/opt/rackstack/rackstack.532.2/nova/lib/python2.7/site-packages/oslo_messaging/rpc/dispatcher.py", line 189, in _dispatch
    executor_callback)
  File "/opt/rackstack/rackstack.532.2/nova/lib/python2.7/site-packages/oslo_messaging/rpc/dispatcher.py", line 130, in _do_dispatch
    result = func(ctxt, **new_args)
  File "/opt/rackstack/rackstack.532.2/nova/lib/python2.7/site-packages/nova/exception.py", line 110, in wrapped
    payload)
  File "/opt/rackstack/rackstack.532.2/nova/lib/python2.7/site-packages/oslo_utils/excutils.py", line 220, in __exit__
    self.force_reraise()
  File "/opt/rackstack/rackstack.532.2/nova/lib/python2.7/site-packages/oslo_utils/excutils.py", line 196, in force_reraise
    six.reraise(self.type_, self.value, self.tb)
  File "/opt/rackstack/rackstack.532.2/nova/lib/python2.7/site-packages/nova/exception.py", line 89, in wrapped
    return f(self, context, *args, **kw)
  File "/opt/rackstack/rackstack.532.2/nova/lib/python2.7/site-packages/nova/compute/manager.py", line 413, in decorated_function
    return function(self, context, *args, **kwargs)
  File "/opt/rackstack/rackstack.532.2/nova/lib/python2.7/site-packages/nova/compute/manager.py", line 391, in decorated_function
    kwargs['instance'], e, sys.exc_info())
  File "/opt/rackstack/rackstack.532.2/nova/lib/python2.7/site-packages/oslo_utils/excutils.py", line 220, in __exit__
    self.force_reraise()
  File "/opt/rackstack/rackstack.532.2/nova/lib/python2.7/site-packages/oslo_utils/excutils.py", line 196, in force_reraise
    six.reraise(self.type_, self.value, self.tb)
  File "/opt/rackstack/rackstack.532.2/nova/lib/python2.7/site-packages/nova/compute/manager.py", line 379, in decorated_function
    return function(self, context, *args, **kwargs)
  File "/opt/rackstack/rackstack.532.2/nova/lib/python2.7/site-packages/nova/compute/manager.py", line 5281, in check_can_live_migrate_source
    block_device_info)
  File "/opt/rackstack/rackstack.532.2/nova/lib/python2.7/site-packages/nova/virt/xenapi/driver.py", line 530, in check_can_live_migrate_source
    dest_check_data)
  File "/opt/rackstack/rackstack.532.2/nova/lib/python2.7/site-packages/nova/virt/xenapi/vmops.py", line 2419, in check_can_live_migrate_source
    "VM.assert_can_migrate", vm_ref, dest_check_data)
  File "/opt/rackstack/rackstack.532.2/nova/lib/python2.7/site-packages/nova/virt/xenapi/vmops.py", line 2524, in _call_live_migrate_command
    vdi_map, vif_map, options)
  File "/opt/rackstack/rackstack.532.2/nova/lib/python2.7/site-packages/nova/virt/xenapi/client/session.py", line 210, in call_xenapi
    return session.xenapi_request(method, args)
  File "/opt/rackstack/rackstack.532.2/nova/lib/python2.7/site-packages/XenAPI.py", line 133, in xenapi_request
    result = _parse_result(getattr(self, methodname)(*full_params))
  File "/usr/lib/python2.7/xmlrpclib.py", line 1224, in __call__
    return self.__send(self.__name, args)
  File "/usr/lib/python2.7/xmlrpclib.py", line 1572, in __request
    allow_none=self.__allow_none)
  File "/usr/lib/python2.7/xmlrpclib.py", line 1085, in dumps
    data = m.dumps(params)
  File "/usr/lib/python2.7/xmlrpclib.py", line 632, in dumps
    dump(v, write)
  File "/usr/lib/python2.7/xmlrpclib.py", line 652, in __dump
    raise TypeError, "cannot marshal %s objects" % type(value)
TypeError: cannot marshal <class 'oslo_versionedobjects.fields.CoercedDict'> objects

3. Reproduction steps

* nova boot bug-xmlrpc_marshall_exception
* nova live-migration --block-migrate bug-xmlrpc_marshall_exception

** Affects: nova
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1550795

Title:
  live migration with block migration on Xen produces "cannot marshal"
  exception

Status in OpenStack Compute (nova):
  New

Bug description:
  1. Nova version

  commit ce5a2fb419f999bec0fb2c67413387c8b67a691a

  2. Deserialized traceback as captured in log as received by messaging

  Traceback (most recent call last):
    File "/opt/rackstack/rackstack.532.2/nova/lib/python2.7/site-packages/oslo_messaging/rpc/dispatcher.py", line 143, in _dispatch_and_reply
      executor_callback))
    File "/opt/rackstack/rackstack.532.2/nova/lib/python2.7/site-packages/oslo_messaging/rpc/dispatcher.py", line 189, in _dispatch
      executor_callback)
    File "/opt/rackstack/rackstack.532.2/nova/lib/python2.7/site-packages/oslo_messaging/rpc/dispatcher.py", line 130, in _do_dispatch
      result = func(ctxt, **new_args)
    File "/opt/rackstack/rackstack.532.2/nova/lib/python2.7/site-packages/nova/exception.py", line 110, in wrapped
      payload)
    File "/opt/rackstack/rackstack.532.2/nova/lib/python2.7/site-packages/oslo_utils/excutils.py", line 220, in __exit__
      self.force_reraise()
    File "/opt/rackstack/rackstack.532.2/nova/lib/python2.7/site-packages/oslo_utils/excutils.py", line 196, in force_reraise
      six.reraise(self.type_, self.value, self.tb)
    File "/opt/rackstack/rackstack.532.2/nova/lib/python2.7/site-packages/nova/exception.py", line 89, in wrapped
      return f(self, context, *args, **kw)
    File "/opt/rackstack/rackstack.532.2/nova/lib/python2.7/site-packages/nova/compute/manager.py", line 413, in decorated_function
      return function(self, context, *args, **kwargs)
    File "/opt/rackstack/rackstack.532.2/nova/lib/python2.7/site-packages/nova/compute/manager.py", line 391, in decorated_function
      kwargs['instance'], e, sys.exc_info())
    File "/opt/rackstack/rackstack.532.2/nova/lib/python2.7/site-packages/oslo_utils/excutils.py", line 220, in __exit__
      self.force_reraise()
    File "/opt/rackstack/rackstack.532.2/nova/lib/python2.7/site-packages/oslo_utils/excutils.py", line 196, in force_reraise
      six.reraise(self.type_, self.value, self.tb)
    File "/opt/rackstack/rackstack.532.2/nova/lib/python2.7/site-packages/nova/compute/manager.py", line 379, in decorated_function
      return function(self, context, *args, **kwargs)
    File "/opt/rackstack/rackstack.532.2/nova/lib/python2.7/site-packages/nova/compute/manager.py", line 5281, in check_can_live_migrate_source
      block_device_info)
    File "/opt/rackstack/rackstack.532.2/nova/lib/python2.7/site-packages/nova/virt/xenapi/driver.py", line 530, in check_can_live_migrate_source
      dest_check_data)
    File "/opt/rackstack/rackstack.532.2/nova/lib/python2.7/site-packages/nova/virt/xenapi/vmops.py", line 2419, in check_can_live_migrate_source
      "VM.assert_can_migrate", vm_ref, dest_check_data)
    File "/opt/rackstack/rackstack.532.2/nova/lib/python2.7/site-packages/nova/virt/xenapi/vmops.py", line 2524, in _call_live_migrate_command
      vdi_map, vif_map, options)
    File "/opt/rackstack/rackstack.532.2/nova/lib/python2.7/site-packages/nova/virt/xenapi/client/session.py", line 210, in call_xenapi
      return session.xenapi_request(method, args)
    File "/opt/rackstack/rackstack.532.2/nova/lib/python2.7/site-packages/XenAPI.py", line 133, in xenapi_request
      result = _parse_result(getattr(self, methodname)(*full_params))
    File "/usr/lib/python2.7/xmlrpclib.py", line 1224, in __call__
      return self.__send(self.__name, args)
    File "/usr/lib/python2.7/xmlrpclib.py", line 1572, in __request
      allow_none=self.__allow_none)
    File "/usr/lib/python2.7/xmlrpclib.py", line 1085, in dumps
      data = m.dumps(params)
    File "/usr/lib/python2.7/xmlrpclib.py", line 632, in dumps
      dump(v, write)
    File "/usr/lib/python2.7/xmlrpclib.py", line 652, in __dump
      raise TypeError, "cannot marshal %s objects" % type(value)
  TypeError: cannot marshal <class 'oslo_versionedobjects.fields.CoercedDict'> objects

  3. Reproduction steps

  * nova boot bug-xmlrpc_marshall_exception
  * nova live-migration --block-migrate bug-xmlrpc_marshall_exception

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Follow ups

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