High CPU from org.xnio._private.Messages_$logger.connectionClosedEarly calls in EAP 7's I/O threads

Issue

• JBoss EAP 7 reaches high CPU and its I/O threads persist with high CPU in calls like below:

"default I/O-31" #152 prio=5 os_prio=0 tid=0x0000562ec5b22800 nid=0xce7d runnable [0x00007ff48858f000]
   java.lang.Thread.State: RUNNABLE
        at java.lang.Throwable.fillInStackTrace(Native Method)
        at java.lang.Throwable.fillInStackTrace(Throwable.java:784)
        - locked <0x000000062e9ff4f0> (a java.io.EOFException)
        at java.lang.Throwable.<init>(Throwable.java:266)
        at java.lang.Exception.<init>(Exception.java:66)
        at java.io.IOException.<init>(IOException.java:58)
        at java.io.EOFException.<init>(EOFException.java:62)
        at org.xnio._private.Messages_$logger.connectionClosedEarly(Messages_$logger.java:669)
        at org.xnio.http.HttpUpgrade$HttpUpgradeState$UpgradeResultListener.handleEvent(HttpUpgrade.java:416)
        at org.xnio.http.HttpUpgrade$HttpUpgradeState$UpgradeResultListener.handleEvent(HttpUpgrade.java:400)
        at org.xnio.ChannelListeners.invokeChannelListener(ChannelListeners.java:92)
        at org.xnio.conduits.ReadReadyHandler$ChannelListenerHandler.readReady(ReadReadyHandler.java:66)
        at io.undertow.protocols.ssl.SslConduit$SslReadReadyHandler.readReady(SslConduit.java:1254)
        at org.xnio.nio.NioSocketConduit.handleReady(NioSocketConduit.java:89)
        at org.xnio.nio.WorkerThread.run(WorkerThread.java:591)