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["ChangBo Guo\(gcb\)" <glongwave@xxxxxxxxx>]

Public bug reported:

Boot one instance with security_group_api=nova , it will check  Nova's
default security  group firstly,

There is race condition that boot some instances at the first time for
same tenant.  with config option " security_group_api=nova " , current
logic is :

1. get default security group
2. if not get it , create one.

two threads may in step2 , than a exception.SecurityGroupExists is
raised.

Note: this only occure  randomly  when boot some instances at the first
time for same tenant.

** Affects: nova
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1373777

Title:
  race condition when create Nova default security group for same tenant

Status in OpenStack Compute (Nova):
  New

Bug description:
  Boot one instance with security_group_api=nova , it will check  Nova's
  default security  group firstly,

  There is race condition that boot some instances at the first time for
  same tenant.  with config option " security_group_api=nova " , current
  logic is :

  1. get default security group
  2. if not get it , create one.

  two threads may in step2 , than a exception.SecurityGroupExists is
  raised.

  Note: this only occure  randomly  when boot some instances at the
  first time for same tenant.

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