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[Thierry Carrez <thierry.carrez+lp@xxxxxxxxx>]

** Changed in: nova
       Status: Fix Committed => Fix Released

** Changed in: nova
    Milestone: None => kilo-3

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https://bugs.launchpad.net/bugs/1410172

Title:
  500 on deleteing a not existing ec2 security group

Status in OpenStack Compute (Nova):
  Fix Released

Bug description:
  Looks like there are 2 reason for seeing 500 errors on  not existing
  ec2 security group delete attempt:

  *  Unexpected TypeError raised: expected string or buffer
  *  Unexpected UnboundLocalError raised: local variable 'group' referenced before assignment

  Since it is server error the euca2ools automatically and silently
  retries the request multiple (unlimited?) times.

  1. source the ec2 credentials:
  $source /opt/stack/new/devstack/accrc/demo/demo

  2.a:
  $  euca-delete-group --debug 42
  ...
  2015-01-13 09:57:02,907 euca2ools [DEBUG]:Received 500 response.  Retrying in 1.9 seconds

  2.b:
  $  euca-delete-group --debug fortytwo

  Relevant lines from the n-api log (It does not contains a full trace,
  however on this kind of errors it should):

  action: DeleteSecurityGroup __call__ /opt/stack/new/nova/nova/api/ec2/__init__.py:379
  arg: GroupName          val: fortytwo __call__ /opt/stack/new/nova/nova/api/ec2/__init__.py:382
  Neutron security group fortytwo not found get /opt/stack/new/nova/nova/network/security_group/neutron_driver.py:138
  Unexpected UnboundLocalError raised: local variable 'group' referenced before assignment
  EC2 error response: UnboundLocalError: Unknown error occurred. ec2_error_response /opt/stack/new/nova/nova/api/ec2/faults.py:29

  Note: The issue seen in a neutron setup.

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