High number of idle MSC threads persisting on JBoss EAP

Issue

• We see a large number of idle MSC threads, for example:

"MSC service thread 1-4" prio=10 tid=0x00007ff9c863d000 nid=0x434e waiting on condition [0x00007ff9bcfda000]
   java.lang.Thread.State: WAITING (parking)
    at sun.misc.Unsafe.park(Native Method)
    - parking to wait for  <0x000000076e70ceb8> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
    at java.util.concurrent.locks.LockSupport.park(LockSupport.java:156)
    at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1987)
    at java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:399)
    at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:957)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:917)
    at java.lang.Thread.run(Thread.java:662)

• Is this a concern?