High amount of non-blocking-thread threads in JBoss EAP

Solution Verified - Updated -

Issue

  • JBoss has many threads, but one common source we see is hundreds of non-blocking-threads like below. What are these from and can they be reduced?
"non-blocking-thread--p5-t112" #670 daemon prio=5 os_prio=0 cpu=21.42ms elapsed=1626953.22s tid=0x0000564f06200e10 nid=0x10f44 waiting on condition  [0x00007f2574001000]
   java.lang.Thread.State: WAITING (parking)
    at jdk.internal.misc.Unsafe.park(java.base@17.0.13/Native Method)
    - parking to wait for  <0x0000000081f5cd50> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
    at java.util.concurrent.locks.LockSupport.park(java.base@17.0.13/LockSupport.java:341)
    at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionNode.block(java.base@17.0.13/AbstractQueuedSynchronizer.java:506)
    at java.util.concurrent.ForkJoinPool.unmanagedBlock(java.base@17.0.13/ForkJoinPool.java:3465)
    at java.util.concurrent.ForkJoinPool.managedBlock(java.base@17.0.13/ForkJoinPool.java:3436)
    at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(java.base@17.0.13/AbstractQueuedSynchronizer.java:1623)
    at java.util.concurrent.LinkedBlockingQueue.take(java.base@17.0.13/LinkedBlockingQueue.java:435)
    at java.util.concurrent.ThreadPoolExecutor.getTask(java.base@17.0.13/ThreadPoolExecutor.java:1062)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(java.base@17.0.13/ThreadPoolExecutor.java:1122)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(java.base@17.0.13/ThreadPoolExecutor.java:635)
    at org.wildfly.clustering.context.ContextReferenceExecutor.execute(ContextReferenceExecutor.java:49)
    at org.wildfly.clustering.context.ContextualExecutor$1.run(ContextualExecutor.java:78)
    at java.lang.Thread.run(java.base@17.0.13/Thread.java:842)

Environment

  • JBoss Enterprise Application Platform (EAP)
    • 7.x
    • 8.x

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