High CPU in XNIO code after updating to EAP 6.4 CP17/CP18

Issue

• After upgrading from EAP 6.4.15.GA to EAP 6.4.17.GA, all our PROD Jboss servers CPU usage went up to 100%.
• We see high CPU in XNIO code like below while connected via SSL enabled management interface:

"Remoting "localhost:MANAGEMENT" read-1" #48 prio=5 os_prio=0 tid=0x00007fb85c0be000 nid=0x1839 runnable [0x00007fb85514b000]
   java.lang.Thread.State: RUNNABLE
    at sun.nio.ch.FileDispatcherImpl.read0(Native Method)
    at sun.nio.ch.SocketDispatcher.read(SocketDispatcher.java:39)
    at sun.nio.ch.IOUtil.readIntoNativeBuffer(IOUtil.java:223)
    at sun.nio.ch.IOUtil.read(IOUtil.java:197)
    at sun.nio.ch.SocketChannelImpl.read(SocketChannelImpl.java:380)
    - locked <0x00000006cf94eb28> (a java.lang.Object)
    at org.xnio.nio.AbstractNioStreamChannel.read(AbstractNioStreamChannel.java:249)
    at org.xnio.ssl.JsseConnectedSslStreamChannel.read(JsseConnectedSslStreamChannel.java:454)
    at org.jboss.remoting3.remote.RemotingMessageChannel.receive(RemotingMessageChannel.java:126)
    - locked <0x00000006cf8cd630> (a java.lang.Object)
    at org.jboss.remoting3.remote.ServerConnectionOpenListener$Initial.handleEvent(ServerConnectionOpenListener.java:243)
    - locked <0x00000006cf8cd600> (a java.util.ArrayDeque)
    at org.jboss.remoting3.remote.ServerConnectionOpenListener$Initial.handleEvent(ServerConnectionOpenListener.java:140)
    at org.xnio.ChannelListeners.invokeChannelListener(ChannelListeners.java:72)
    at org.xnio.channels.TranslatingSuspendableChannel.handleReadable(TranslatingSuspendableChannel.java:189)
    at org.xnio.channels.TranslatingSuspendableChannel$1.handleEvent(TranslatingSuspendableChannel.java:103)
    at org.xnio.ChannelListeners.invokeChannelListener(ChannelListeners.java:72)
    at org.xnio.channels.TranslatingSuspendableChannel.handleReadable(TranslatingSuspendableChannel.java:189)
    at org.xnio.ssl.JsseConnectedSslStreamChannel.handleReadable(JsseConnectedSslStreamChannel.java:183)
    at org.xnio.channels.TranslatingSuspendableChannel$1.handleEvent(TranslatingSuspendableChannel.java:103)
    at org.xnio.ChannelListeners.invokeChannelListener(ChannelListeners.java:72)
    at org.xnio.nio.NioHandle.run(NioHandle.java:90)
    at org.xnio.nio.WorkerThread.run(WorkerThread.java:198)

"Remoting "localhost" read-1" #76 prio=5 os_prio=0 tid=0x00007fb85c137000 nid=0x1855 runnable [0x00007fb85332d000]
   java.lang.Thread.State: RUNNABLE
    at sun.nio.ch.FileDispatcherImpl.read0(Native Method)
    at sun.nio.ch.SocketDispatcher.read(SocketDispatcher.java:39)
    at sun.nio.ch.IOUtil.readIntoNativeBuffer(IOUtil.java:223)
    at sun.nio.ch.IOUtil.read(IOUtil.java:197)
    at sun.nio.ch.SocketChannelImpl.read(SocketChannelImpl.java:380)
    - locked <0x00000006cf951548> (a java.lang.Object)
    at org.xnio.nio.AbstractNioStreamChannel.read(AbstractNioStreamChannel.java:249)
    at org.jboss.remoting3.remote.RemotingMessageChannel.readMessageLength(RemotingMessageChannel.java:78)
    at org.jboss.remoting3.remote.ServerConnectionOpenListener$Initial.handleEvent(ServerConnectionOpenListener.java:228)
    at org.jboss.remoting3.remote.ServerConnectionOpenListener$Initial.handleEvent(ServerConnectionOpenListener.java:140)
    at org.xnio.ChannelListeners.invokeChannelListener(ChannelListeners.java:72)
    at org.xnio.channels.TranslatingSuspendableChannel.handleReadable(TranslatingSuspendableChannel.java:189)
    at org.xnio.channels.TranslatingSuspendableChannel$1.handleEvent(TranslatingSuspendableChannel.java:103)
    at org.xnio.ChannelListeners.invokeChannelListener(ChannelListeners.java:72)
    at org.xnio.nio.NioHandle.run(NioHandle.java:90)
    at org.xnio.nio.WorkerThread.run(WorkerThread.java:198)