Github user mike-tutkowski commented on the pull request:
https://github.com/apache/cloudstack/pull/660#issuecomment-128250790
So, the way we got around the issue of occasionally acquiring the same
device ID was to move the retrieve-device-ID logic from the API layer (which
can be called in parallel) to the attach logic in the job queue (which will
serialize these kinds of calls to the same VM).
In other words, we no longer have an issue of acquiring the same device ID.
This particular bug is around us forgetting to call "acquire device ID" in
the attach logic for one use case.
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