Github user felixcheung commented on the issue:
https://github.com/apache/spark/pull/17892
similar flaky test around ml, with this in the log
```
Exception in thread "SparkListenerBus" java.lang.IllegalAccessError:
Attempted to access garbage collected accumulator 50693
at
org.apache.spark.util.AccumulatorContext$$anonfun$get$1.apply(AccumulatorV2.scala:265)
at
org.apache.spark.util.AccumulatorContext$$anonfun$get$1.apply(AccumulatorV2.scala:261)
at scala.Option.map(Option.scala:146)
at
org.apache.spark.util.AccumulatorContext$.get(AccumulatorV2.scala:261)
at org.apache.spark.util.AccumulatorV2.name(AccumulatorV2.scala:88)
at
org.apache.spark.sql.execution.metric.SQLMetric.toInfo(SQLMetrics.scala:67)
at
org.apache.spark.sql.execution.ui.SQLListener$$anonfun$onTaskEnd$1.apply(SQLListener.scala:216)
at
org.apache.spark.sql.execution.ui.SQLListener$$anonfun$onTaskEnd$1.apply(SQLListener.scala:216)
at
scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:234)
at
scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:234)
at
scala.collection.mutable.ResizableArray$class.foreach(ResizableArray.scala:59)
at scala.collection.mutable.ArrayBuffer.foreach(ArrayBuffer.scala:48)
at scala.collection.TraversableLike$class.map(TraversableLike.scala:234)
at scala.collection.AbstractTraversable.map(Traversable.scala:104)
at
org.apache.spark.sql.execution.ui.SQLListener.onTaskEnd(SQLListener.scala:216)
at
org.apache.spark.scheduler.SparkListenerBus$class.doPostEvent(SparkListenerBus.scala:45)
at
org.apache.spark.scheduler.LiveListenerBus.doPostEvent(LiveListenerBus.scala:36)
at
org.apache.spark.scheduler.LiveListenerBus.doPostEvent(LiveListenerBus.scala:36)
at
org.apache.spark.util.ListenerBus$class.postToAll(ListenerBus.scala:63)
at
org.apache.spark.scheduler.LiveListenerBus.postToAll(LiveListenerBus.scala:36)
at
org.apache.spark.scheduler.LiveListenerBus$$anon$1$$anonfun$run$1$$anonfun$apply$mcV$sp$1.apply$mcV$sp(LiveListenerBus.scala:94)
at
org.apache.spark.scheduler.LiveListenerBus$$anon$1$$anonfun$run$1$$anonfun$apply$mcV$sp$1.apply(LiveListenerBus.scala:79)
at
org.apache.spark.scheduler.LiveListenerBus$$anon$1$$anonfun$run$1$$anonfun$apply$mcV$sp$1.apply(LiveListenerBus.scala:79)
at scala.util.DynamicVariable.withValue(DynamicVariable.scala:58)
at
org.apache.spark.scheduler.LiveListenerBus$$anon$1$$anonfun$run$1.apply$mcV$sp(LiveListenerBus.scala:78)
at org.apache.spark.util.Utils$.tryOrStopSparkContext(Utils.scala:1268)
at
org.apache.spark.scheduler.LiveListenerBus$$anon$1.run(LiveListenerBus.scala:77
```
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