Github user JoshRosen commented on the issue:

    https://github.com/apache/spark/pull/15022
  
    Actually, I spot one more step to make this really robust: I think we also 
need to call `releasePendingUnrollMemoryForThisTask` at the end of `Task` in 
order to be absolutely sure this memory will be released during error cases.
    
    Can you add a call to `releasePendingUnrollMemoryForThisTask` to 
https://github.com/apache/spark/blob/047bc3f13ae193aa49571b6e417f2b5001698bbd/core/src/main/scala/org/apache/spark/scheduler/Task.scala#L106


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