Github user mridulm commented on the issue:
https://github.com/apache/spark/pull/17610
bq. I don't get it. But I think the stack trace shows why this dead-lock
happens.
Based on your description/stacktrace, I get why the deadlock happens - what
I meant was, do any of the super.* methods invoked in the `stop` call tree
assume they are invoked with `this` already locked ?
If not, then a narrow lock on `this` just to flip the state of `stopped`
might be better. An `AtomicBoolean` will introduce a new lock (which is not
required here I think).
The deadlock occurs because we are calling rpc with the lock held already
(which is probably be a pattern we should somehow catch since it will
invariably cause deadlocks !)
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