zhuzhurk edited a comment on issue #9288: [FLINK-13421] [runtime] Do not allocate slots in a MultiTaskSlot when it’s releasing children URL: https://github.com/apache/flink/pull/9288#issuecomment-517152938 > Thanks for opening this PR @zhuzhurk. I have to admit that I cannot completely follow how the `ConcurrentModificationException` occurs. Could you maybe show me a stack trace of the problematic behaviour? How does it happen that we assign a new child to a `MultiTaskSlot` while it is being released? > > At the moment I don't see how the behaviour you've covered with the test could occur. > > Do you have an example which reproduces the reported problem? With such an example I could better understand the problem or one could generate logs on DEBUG log level. Hi, @tillrohrmann, I added a case to repro this issue at https://github.com/zhuzhurk/flink/commit/7ef30934841854ed7711a5a0eabf89ecefb0ec2d. For the log, unfortunately that round of stability test was running with a local patch for FLINK-13241, and cannot find the community revision number. But I think it's not a new issue, which may happen since 1.7 or 1.8.
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