suztomo commented on pull request #14474:
URL: https://github.com/apache/beam/pull/14474#issuecomment-817023747


   Another case https://gist.github.com/suztomo/b2b7a5a8c4394eb4e11eb4efe2d1b5e5
   
   https://gist.github.com/suztomo/b2b7a5a8c4394eb4e11eb4efe2d1b5e5
   
   ```
   19:21:01 "pool-32-thread-3" #136 prio=5 os_prio=0 tid=0x00007fb2b8e76000 
nid=0x744c waiting on condition [0x00007fb32d116000]
   19:21:01    java.lang.Thread.State: WAITING (parking)
   19:21:01     at sun.misc.Unsafe.park(Native Method)
   19:21:01     - parking to wait for  <0x00000000d7b42658> (a 
java.util.concurrent.CountDownLatch$Sync)
   19:21:01     at 
java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
   19:21:01     at 
java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:836)
   19:21:01     at 
java.util.concurrent.locks.AbstractQueuedSynchronizer.doAcquireSharedInterruptibly(AbstractQueuedSynchronizer.java:997)
   19:21:01     at 
java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireSharedInterruptibly(AbstractQueuedSynchronizer.java:1304)
   19:21:01     at 
java.util.concurrent.CountDownLatch.await(CountDownLatch.java:231)
   19:21:01     at 
org.apache.beam.runners.dataflow.worker.fn.logging.BeamFnLoggingServiceTest.lambda$testMultipleClientsFailingIsHandledGracefullyByServer$1(BeamFnLoggingServiceTest.java:145)
   19:21:01     at 
org.apache.beam.runners.dataflow.worker.fn.logging.BeamFnLoggingServiceTest$$Lambda$179/461780632.call(Unknown
 Source)
   19:21:01     at java.util.concurrent.FutureTask.run(FutureTask.java:266)
   
   ...
   
   19:21:01 "Test worker" #20 prio=5 os_prio=0 tid=0x00007fb364fe1000 
nid=0x5d89 waiting on condition [0x00007fb32f841000]
   19:21:01    java.lang.Thread.State: WAITING (parking)
   19:21:01     at sun.misc.Unsafe.park(Native Method)
   19:21:01     - parking to wait for  <0x00000000d72b4468> (a 
java.util.concurrent.FutureTask)
   19:21:01     at 
java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
   19:21:01     at 
java.util.concurrent.FutureTask.awaitDone(FutureTask.java:429)
   19:21:01     at java.util.concurrent.FutureTask.get(FutureTask.java:191)
   19:21:01     at 
java.util.concurrent.AbstractExecutorService.invokeAll(AbstractExecutorService.java:244)
   19:21:01     at 
org.apache.beam.runners.dataflow.worker.fn.logging.BeamFnLoggingServiceTest.testMultipleClientsFailingIsHandledGracefullyByServer(BeamFnLoggingServiceTest.java:150)
   ...
   
   ```
   
   This time, it has GrpcWindmillServerTest:
   
   ```
   19:21:01 "Thread-11" #88 prio=5 os_prio=0 tid=0x00007fb29000f800 nid=0x6cc9 
waiting on condition [0x00007fb31e6e7000]
   19:21:01    java.lang.Thread.State: TIMED_WAITING (sleeping)
   19:21:01     at java.lang.Thread.sleep(Native Method)
   19:21:01     at 
org.apache.beam.runners.dataflow.worker.windmill.GrpcWindmillServerTest$ResponseErrorInjector.errorThreadBody(GrpcWindmillServerTest.java:141)
   19:21:01     at 
org.apache.beam.runners.dataflow.worker.windmill.GrpcWindmillServerTest$ResponseErrorInjector$$Lambda$81/1082375513.run(Unknown
 Source)
   19:21:01     at java.lang.Thread.run(Thread.java:748)
   19:21:01 
   ```


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