Github user gaborgsomogyi commented on the issue:
https://github.com/apache/spark/pull/19893
I've just started to take a look at it deeper and found some patterns.
Namely we can exclude all netty.* threads + ForkJoinPool.* is most of the time
but not always created inside scala by the global ExecutionContext. All in all
far from have a good picture but I'll exclude these entries.
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