Github user gaborgsomogyi commented on the issue:
https://github.com/apache/spark/pull/20888
Thank for the hints. I've taken a deeper look at the possible solutions and
the suggested test. The problem is similar but not the same so I would solve it
a different way. So here is my proposal. `cancelStage` sets `reasonIfKilled` in
`TaskContext` normally but the executor thread will run untouched at this
timestamp. The thread will be killed later triggered by `killTaskIfInterrupted`
which throws `TaskKilledException`. When `isInterrupted` checked all the time
when `DataFrameRangeSuite.stageToKill` will be set then the race can be avoided.
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