This was the source of that pesky 10.6-only test_clone_media_element.html hang that's been blocking bug 1135785 from landing. Try confirms the fix: https://treeherder.mozilla.org/#/jobs?repo=try&revision=7fd09a1d9acb Given the raciness involved, the patch is quite simple and understandable. Uploading and flagging for review.
Other streams in the list bail out of the servicing loop if they're closed, so we can wait indefinitely.
Attachment #8570929 - Flags: review?(roc)
Attachment #8570929 - Flags: review?(roc) → review+
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