Thread Stuck at sun.nio.ch.EPollArrayWrapper.epollWai

Hello,

We have noticed the following thread hang. It seems to cause wildfly to stop handling http requests. Only a restart fixes. We have not been able to reproduce the issue under test.

PID = 62566, CPU = 66.7%
"default I/O-72" #175 prio=5 os_prio=0 tid=0x00007f1da09cb800 nid=0xf466 runnable [0x00007f1d7013f000]
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:79)
at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:86)

• locked <0x00007f248f9f8028> (a sun.nio.ch.Util$2)
• locked <0x00007f248f9f8010> (a java.util.Collections$UnmodifiableSet)
• locked <0x00007f248f95a0a0> (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.WorkerThread.run(WorkerThread.java:509)