Comment 1 for bug 1578520

I could not reproduce the bug on my all-in-one single node devstack, I guess the tricky part would be how busy is your system, and how quickly you attach the ports to the VM.

To attach new ports to VM as soon as possible, I put them into shell file, then ran it.
 nova interface-attach --port-id 686747b0-9b96-49af-9588-1edd9434502e vm
 nova interface-attach --port-id cc9b9d7a-b422-4d9c-9810-510bc860eb43 vm

I was wondering how often you can catch this bug.