curcur commented on pull request #12912:
URL: https://github.com/apache/flink/pull/12912#issuecomment-661681066


   Hey, @zhijiangW , I do not disagree with the solution for checking 
`isReleased`. 
   
   For the second point, I mean if the cleanup of channels (sort by channel id 
for example) in the same order in the two threads, would that resolve the 
deadlock problem as well. 


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