java/util/concurrent/ConcurrentHashMap/ToArray.java timed out intermittently

java/util/concurrent/ConcurrentHashMap/ToArray.java

observed this test timed out in jdk-13+10 testing intermittently, on both linux-x64 and windows-x64 (both machines are 32 cores system)
Update: also spotted on a Solaris-SPARCV9 machine.


"AgentVMThread" #1537 prio=5 os_prio=0 cpu=31.25ms elapsed=1211.59s tid=0x0000003a4c7c7000 nid=0x2bb0 waiting on condition [0x0000003a51a3e000]
   java.lang.Thread.State: WAITING (parking)
at jdk.internal.misc.Unsafe.park(java.base@13-ea/Native Method)
- parking to wait for <0x00000000e041f898> (a java.util.concurrent.CompletableFuture$Signaller)
at java.util.concurrent.locks.LockSupport.park(java.base@13-ea/LockSupport.java:194)
at java.util.concurrent.CompletableFuture$Signaller.block(java.base@13-ea/CompletableFuture.java:1867)
at java.util.concurrent.ForkJoinPool.managedBlock(java.base@13-ea/ForkJoinPool.java:3137)
at java.util.concurrent.CompletableFuture.waitingGet(java.base@13-ea/CompletableFuture.java:1894)
at java.util.concurrent.CompletableFuture.join(java.base@13-ea/CompletableFuture.java:2114)
at ToArray.executeTest(ToArray.java:99)
at ToArray.main(ToArray.java:41)
at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(java.base@13-ea/Native Method)
at jdk.internal.reflect.NativeMethodAccessorImpl.invoke(java.base@13-ea/NativeMethodAccessorImpl.java:62)
at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(java.base@13-ea/DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(java.base@13-ea/Method.java:567)
at com.sun.javatest.regtest.agent.MainActionHelper$AgentVMRunnable.run(MainActionHelper.java:298)
at java.lang.Thread.run(java.base@13-ea/Thread.java:835)

"ForkJoinPool.commonPool-worker-51" #1538 daemon prio=5 os_prio=0 cpu=1189859.38ms elapsed=1211.58s tid=0x0000003a4c7c4800 nid=0xdac runnable [0x0000003a51b3e000]
   java.lang.Thread.State: RUNNABLE
at java.util.concurrent.ConcurrentHashMap$BaseIterator.<init>(java.base@13-ea/ConcurrentHashMap.java:3428)
at java.util.concurrent.ConcurrentHashMap$KeyIterator.<init>(java.base@13-ea/ConcurrentHashMap.java:3447)
at java.util.concurrent.ConcurrentHashMap$KeySetView.iterator(java.base@13-ea/ConcurrentHashMap.java:4627)
at java.util.concurrent.ConcurrentHashMap$CollectionView.toArray(java.base@13-ea/ConcurrentHashMap.java:4456)
at ToArray$1.run(ToArray.java:78)
at java.util.concurrent.CompletableFuture$AsyncRun.run(java.base@13-ea/CompletableFuture.java:1807)
at java.util.concurrent.CompletableFuture$AsyncRun.exec(java.base@13-ea/CompletableFuture.java:1799)
at java.util.concurrent.ForkJoinTask.doExec(java.base@13-ea/ForkJoinTask.java:290)
at java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(java.base@13-ea/ForkJoinPool.java:1016)
at java.util.concurrent.ForkJoinPool.scan(java.base@13-ea/ForkJoinPool.java:1665)
at java.util.concurrent.ForkJoinPool.runWorker(java.base@13-ea/ForkJoinPool.java:1598)
at java.util.concurrent.ForkJoinWorkerThread.run(java.base@13-ea/ForkJoinWorkerThread.java:177)