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[Launchpad Bug Tracker <1475938@xxxxxxxxxxxxxxxxxx>]

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That damn piece of code again.

In some cases when network is created for tenant and default security group is created in the process, there may be concurrent network of sg creation happening.
That leads to a condition when the code fetches default sg, it's not there, tries to add it - it's already there, then it tries to fetch it again, but due to REPEATABLE READ isolation method, the query returns empty result.
As a result, such logic will hang in the loop forever.

** Affects: neutron
     Importance: Undecided
     Assignee: Eugene Nikanorov (enikanorov)
         Status: New


** Tags: sg-fw
-- 
create_security_group code may get into endless loop
https://bugs.launchpad.net/bugs/1475938
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