Github user andrewor14 commented on the pull request:
https://github.com/apache/spark/pull/11546#issuecomment-217323897
@cenyuhai Thanks for fixing this issue. The two offending locks here seem
to be `info` and `memoryManager`, which wrap each other in one order in
`removeBlock` and the opposite order in `evictBlocksToFreeSpace`. I believe
your fix here is largely correct but still not completely safe.
Once you address the comments I left I will go ahead and merge this.
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