EAP 7 performance issues with StuckThreadDetectionHandler enabled

Environment

• JBoss Enterprise Application Platform (EAP) 7.x

Issue

• We enabled the StuckThreadDetectionHandler and started seeing degraded performance and increased CPU. Thread dumps show blocks like so:

"default I/O-5" #111 prio=5 os_prio=0 tid=0x0000000004cb5000 nid=0x1156 waiting for monitor entry [0x00007f92bf195000]
   java.lang.Thread.State: BLOCKED (on object monitor)
	at io.undertow.server.handlers.StuckThreadDetectionHandler$1.run(StuckThreadDetectionHandler.java:102)
	- waiting to lock <0x000000074fb03710> (a io.undertow.server.handlers.StuckThreadDetectionHandler)
	at org.xnio.nio.WorkerThread.safeRun(WorkerThread.java:612)
	at org.xnio.nio.WorkerThread.run(WorkerThread.java:479)

Resolution

• Apply 7.1.2 or later updates

Root Cause

• Multiple timer tasks were improperly being registered by the handler for extra processing load
• Content from issues.jboss.org is not included.UNDERTOW-1305
• Content from issues.jboss.org is not included.JBEAP-14384

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