Chrome Version       : Version 52.0.2743.116 (64-bit)
URLs (if applicable) : Without transferables, working: https://jsfiddle.net/c2uhk72j/, with transferables, erroring https://jsfiddle.net/3kq9xfb8/
Other browsers tested:
  Add OK or FAIL, along with the version, after other browsers where you
have tested this issue:
     Safari: OK, 9.1.3 (11601.7.8)
    Firefox: OK, 48.0.2, Nightly
         IE: NA

What steps will reproduce the problem?
(1) https://jsfiddle.net/3kq9xfb8/
(2) Observe the error message in the console

What is the expected result?
Worker.postMessage should successfully transfer the arrayBuffer to the worker context.

What happens instead?
The error: "Uncaught DataCloneError: Failed to execute 'postMessage' on 'Worker': An ArrayBuffer is neutered and could not be cloned." is thrown. 

Please provide any additional information below. Attach a screenshot if
possible.
From what I understand, this error is thrown when an ArrayBuffer has already been transferred once and no longer belongs to the main thread. onAudioProcess should be returning a brand new object with every callback, so I don't see how this error could be thrown given the absence of a bug.