Publishing & Promoting Content View Stuck

We've had a "Publishing and promoting to 1 environment" on a content view stuck for about two weeks.

I created a new content view based on the stuck one via the "Copy View" option, but cannot figure out how to kill the backend task and locks for the "stuck" view in order to unregister content hosts from it and move on.

(1) Is there a way to kill the tasks and get the publish/promote to fail so we can remove iot
(2) Is there a way to clean-up all the backend tasks that are pending or failed other than clean backend objects which doesn't appear to actually kill pending ones and locks?