FULL PRODUCT VERSION :
java version "1.8.0_131"
Java(TM) SE Runtime Environment (build 1.8.0_131-b11)
Java HotSpot(TM) 64-Bit Server VM (build 25.131-b11, mixed mode)

ADDITIONAL OS VERSION INFORMATION :
Ubuntu 16.04.2 LTS

Linux api1 4.4.0-1013-aws #22-Ubuntu SMP Fri Mar 31 15:41:31 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux



EXTRA RELEVANT SYSTEM CONFIGURATION :
File limit per process:
Soft Limit Hard Limit Units
100000 100000 files

A DESCRIPTION OF THE PROBLEM :
We have WebSocket server which works normally with 1000 users but starts throwing errors when 2000 users use a server. After that, server leaks both opened files and memory.

Other used technologies: Scala Play Framework 2.4.6, Netty 3.10.6.Final.

The error seems to be related to shipped JDK code.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
There are no easy steps to reproduce issue at the moment


ERROR MESSAGES/STACK TRACES THAT OCCUR :
2017-05-16 15:18:28,149 WARN o.j.n.c.s.n.AbstractNioSelector Unexpected exception in the selector loop.
java.lang.NullPointerException: null
at sun.nio.ch.EPollArrayWrapper.isEventsHighKilled(EPollArrayWrapper.java:174) ~[na:1.8.0_131]
at sun.nio.ch.EPollArrayWrapper.setUpdateEvents(EPollArrayWrapper.java:190) ~[na:1.8.0_131]
at sun.nio.ch.EPollArrayWrapper.add(EPollArrayWrapper.java:239) ~[na:1.8.0_131]
at sun.nio.ch.EPollSelectorImpl.implRegister(EPollSelectorImpl.java:178) ~[na:1.8.0_131]
at sun.nio.ch.SelectorImpl.register(SelectorImpl.java:132) ~[na:1.8.0_131]
at java.nio.channels.spi.AbstractSelectableChannel.register(AbstractSelectableChannel.java:212) ~[na:1.8.0_131]
at org.jboss.netty.channel.socket.nio.NioWorker$RegisterTask.run(NioWorker.java:151) ~[io.netty.netty-3.10.4.Final.jar:na]
at org.jboss.netty.channel.socket.nio.AbstractNioSelector.processTaskQueue(AbstractNioSelector.java:391) ~[io.netty.netty-3.10.4.Final.jar:na]
at org.jboss.netty.channel.socket.nio.AbstractNioSelector.run(AbstractNioSelector.java:315) ~[io.netty.netty-3.10.4.Final.jar:na]
at org.jboss.netty.channel.socket.nio.AbstractNioWorker.run(AbstractNioWorker.java:89) [io.netty.netty-3.10.4.Final.jar:na]
at org.jboss.netty.channel.socket.nio.NioWorker.run(NioWorker.java:178) [io.netty.netty-3.10.4.Final.jar:na]
at org.jboss.netty.util.ThreadRenamingRunnable.run(ThreadRenamingRunnable.java:108) [io.netty.netty-3.10.4.Final.jar:na]
at org.jboss.netty.util.internal.DeadLockProofWorker$1.run(DeadLockProofWorker.java:42) [io.netty.netty-3.10.4.Final.jar:na]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [na:1.8.0_131]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [na:1.8.0_131]
at java.lang.Thread.run(Thread.java:748) [na:1.8.0_131]

REPRODUCIBILITY :
This bug can be reproduced always.