Github user liancheng commented on the pull request:

    https://github.com/apache/spark/pull/12527#issuecomment-212425913
  
    @yhuai This one can probably avoid the deadlock since I worked around it 
[here][1]. Also check [this comment] for more information.
    
    Not sure whether we should merge this one since I haven't figured out 
whether the deadlock is caused bug(s) in this PR or in `DAGScheduler`.
    
    [1]: 
https://github.com/apache/spark/pull/12527/files#diff-75164dfeac2c1507ae828d2ba5529470R304
    [2]: https://github.com/apache/spark/pull/12153#issuecomment-212424785


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