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[Sean Dague <sean@xxxxxxxxx>]

** No longer affects: nova/diablo

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https://bugs.launchpad.net/bugs/907125

Title:
  nova-api throws "lazy load operation of attribute 'network' cannot
  proceed"  under stress

Status in OpenStack Compute (Nova):
  Invalid

Bug description:
  Test Environment:

  Nova stable/diablo (d3f32f742c1622f2d8b4b6fc5f42b04ea5da5664) on 2
  machines.  Launch 20 VMs (in parallel) at a time take them down and
  launch another 20.

  Error:

  When run  euca-describe-instances during and after the VM launch
  process  it occasionally says

  # euca-describe-instances 
  UnknownError: An unknown error has occurred. Please try your request again.

  "Parent instance <FixedIp at 0x5dd6390> is not bound to a Session;
  lazy load operation of attribute 'network' cannot proceed"

  This error is similar to Bug #785816 and Bug #815957

  StackTrace (from nova-api.log)

  2011-12-20 13:07:33,881 ERROR nova.api [69c94d83-24fc-403c-b550-ac528ac80414 nova project_503] Unexpected error raised: Parent instance <FixedIp at 0x5dd6390> is not bound to a Session; lazy load operation of attribute 'network' cannot proceed
  (nova.api): TRACE: Traceback (most recent call last):(nova.api): TRACE:   File "/usr/local/lib/python2.7/dist-packages/nova/api/ec2/__init__.py", line 348, in __call__
  (nova.api): TRACE:     result = api_request.invoke(context)(nova.api): TRACE:   File "/usr/local/lib/python2.7/dist-packages/nova/api/ec2/apirequest.py", line 78, in invoke
  (nova.api): TRACE:     result = method(context, **args)
  (nova.api): TRACE:   File "/usr/local/lib/python2.7/dist-packages/nova/api/ec2/cloud.py", line 1152, in describe_instances
  (nova.api): TRACE:     instance_id=instance_id)(nova.api): TRACE:   File "/usr/local/lib/python2.7/dist-packages/nova/api/ec2/cloud.py", line 1161, in _format_describe_instances
  (nova.api): TRACE:     return {'reservationSet': self._format_instances(context, **kwargs)}
  (nova.api): TRACE:   File "/usr/local/lib/python2.7/dist-packages/nova/api/ec2/cloud.py", line 1266, in _format_instances(nova.api): TRACE:     if fixed['network'] and use_v6:
  (nova.api): TRACE:   File "/usr/local/lib/python2.7/dist-packages/nova/db/sqlalchemy/models.py", line 76, in __getitem__(nova.api): TRACE:     return getattr(self, key)
  (nova.api): TRACE:   File "/usr/lib/python2.7/dist-packages/sqlalchemy/orm/attributes.py", line 163, in __get__
  (nova.api): TRACE:     instance_dict(instance))
  (nova.api): TRACE:   File "/usr/lib/python2.7/dist-packages/sqlalchemy/orm/attributes.py", line 383, in get
  (nova.api): TRACE:     value = callable_(passive=passive)
  (nova.api): TRACE:   File "/usr/lib/python2.7/dist-packages/sqlalchemy/orm/strategies.py", line 595, in __call__
  (nova.api): TRACE:     (mapperutil.state_str(state), self.key)(nova.api): TRACE: DetachedInstanceError: Parent instance <FixedIp at 0x5dd6390> is not bound to a Session; lazy load operation of attribute 'network' cannot proceed(nova.api): TRACE:

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