Github user mridulm commented on the issue:
    @scwf I think the initial fix with a small change might be sufficient.
    What I meant was something like this :
    protected def reset(): Unit = {
      val executors = synchronized {
        Set() ++ executorDataMap.keys
      executors.foreach ( eid => driverEndpoint.askWithRetry[Boolean](
        RemoveExecutor(eid, SlaveLost("Stale executor after cluster manager 
    This will keep the synchronized block restricted to copying the executor 
keys, and leave the rest as-is removing the deadlock. Thoughts ?

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