Cause: When doing deletion and creation requests for networking log objects, Neutron attempts to delete and create those objects in the OVN database at the same time, and requests can interlock themselves. Consequence: You could never send requests about security group log objects to the Neutron API in parallel, and needed to make sure they were done on a sequential pace. Fix: Now, the create operation is asynchronous again, since the creation petition is ignored if the object is already there.