wangshuo128 opened a new pull request #26924: [SPARK-30285][CORE]Fix race condition between LiveListenerBus#stop and AsyncEventQueue#removeListenerOnError URL: https://github.com/apache/spark/pull/26924 ### What changes were proposed in this pull request? There is a race condition between `LiveListenerBus#stop` and `AsyncEventQueue#removeListenerOnError`. We can reproduce as follows: 1. Post some events to `LiveListenerBus` 2. Call `LiveListenerBus#stop` and hold the synchronized lock of `bus`(https://github.com/apache/spark/blob/5e92301723464d0876b5a7eec59c15fed0c5b98c/core/src/main/scala/org/apache/spark/scheduler/LiveListenerBus.scala#L229), waiting until all the events are processed by listeners, then remove all the queues 3. Event queue would drain out events by posting to its listeners. If a listener is interrupted, it will call `AsyncEventQueue#removeListenerOnError`, inside it will call `bus.removeListener`(https://github.com/apache/spark/blob/7b1b60c7583faca70aeab2659f06d4e491efa5c0/core/src/main/scala/org/apache/spark/scheduler/AsyncEventQueue.scala#L207), trying to acquire synchronized lock of bus, resulting in deadlock This PR marks interrupted listeners as dead and don't call `LiveListenerBus#stop` or post event to them during LiveListenerBus is stopping. ### Why are the changes needed? To fix race condition. ### Does this PR introduce any user-facing change? No. ### How was this patch tested? New UT.
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