[SPARK-20358] [core] Executors failing stage on interrupted exception thrown by cancelled tasks #17659
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What changes were proposed in this pull request?
This was a regression introduced by my earlier PR here: #17531
It turns out NonFatal() does not in fact catch InterruptedException.
How was this patch tested?
Extended cancellation unit test coverage. The first test fails before this patch.
cc @JoshRosen @mridulm