fred-db commented on PR #44882:
URL: https://github.com/apache/spark/pull/44882#issuecomment-1914299386

   Hi @mridulm ,
   
   I'm able to reproduce the deadlock consistently when running the test I 
added and after removing the call to `stateLock.synchronized` from 
`getCacheLocs`.
   
   The issue exists essentially with CoalescedRDDs. When calling 
`getPartitions` on a `CoalescedRDD`, the `PartitionLocations` of the 
`DefaultPartitionCoalescer` will do a call to `dagScheduler.getPreferredLocs`, 
which internally calls `getCacheLocs`, causing the deadlock.


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