EAP 7 task thread remains in RUNNABLE state forever at sun.nio.ch.PollArrayWrapper during awaitReadable() call

Issue

• Threads hang and remain in RUNNABLE state forever with the following stracktrace:

  "default task-1" #137 prio=5 os_prio=0 tid=0x0000000005239800 nid=0x926d runnable [0x00007efcba88a000]
  java.lang.Thread.State: RUNNABLE
      at sun.nio.ch.EPollArrayWrapper.epollWait(Native Method)
      at sun.nio.ch.EPollArrayWrapper.poll(EPollArrayWrapper.java:269)
      at sun.nio.ch.EPollSelectorImpl.doSelect(EPollSelectorImpl.java:93)
      at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:86)
      - locked <0x00000000eeb7e058> (a sun.nio.ch.Util$3)
      - locked <0x00000000eeb7e048> (a java.util.Collections$UnmodifiableSet)
      - locked <0x00000000eeb7df30> (a sun.nio.ch.EPollSelectorImpl)
      at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:97)
      at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:101)
      at org.xnio.nio.SelectorUtils.await(SelectorUtils.java:51)
      at org.xnio.nio.NioSocketConduit.awaitReadable(NioSocketConduit.java:358)
      at io.undertow.protocols.ssl.SslConduit.awaitReadable(SslConduit.java:312)
      at org.xnio.conduits.AbstractSourceConduit.awaitReadable(AbstractSourceConduit.java:66)
      at io.undertow.conduits.ReadDataStreamSourceConduit.awaitReadable(ReadDataStreamSourceConduit.java:101)
      at io.undertow.conduits.FixedLengthStreamSourceConduit.awaitReadable(FixedLengthStreamSourceConduit.java:285)
      at org.xnio.conduits.ConduitStreamSourceChannel.awaitReadable(ConduitStreamSourceChannel.java:151)
      at io.undertow.channels.DetachableStreamSourceChannel.awaitReadable(DetachableStreamSourceChannel.java:77)
      at io.undertow.server.HttpServerExchange$ReadDispatchChannel.awaitReadable(HttpServerExchange.java:2201)
      at org.xnio.channels.Channels.readBlocking(Channels.java:295)
      at io.undertow.servlet.spec.ServletInputStreamImpl.readIntoBuffer(ServletInputStreamImpl.java:192)
      at io.undertow.servlet.spec.ServletInputStreamImpl.close(ServletInputStreamImpl.java:257)
      at io.undertow.servlet.spec.HttpServletRequestImpl.closeAndDrainRequest(HttpServletRequestImpl.java:682)
      at io.undertow.servlet.core.ServletBlockingHttpExchange.close(ServletBlockingHttpExchange.java:89)
      at io.undertow.server.HttpServerExchange.endExchange(HttpServerExchange.java:1624)
      at io.undertow.server.Connectors.executeRootHandler(Connectors.java:385)
      at io.undertow.server.HttpServerExchange$1.run(HttpServerExchange.java:830)
      at org.jboss.threads.ContextClassLoaderSavingRunnable.run(ContextClassLoaderSavingRunnable.java:35)
      at org.jboss.threads.EnhancedQueueExecutor.safeRun(EnhancedQueueExecutor.java:1985)
      at org.jboss.threads.EnhancedQueueExecutor$ThreadBody.doRunTask(EnhancedQueueExecutor.java:1487)
      at org.jboss.threads.EnhancedQueueExecutor$ThreadBody.run(EnhancedQueueExecutor.java:1378)
      at java.lang.Thread.run(Thread.java:748)