EAP 7 shutdown stalls with in process requests

Issue

• JBoss shutdown is not completing and the only activity shown in thread dumps is pending request processing like the following:

"default task-23" #174 prio=5 os_prio=0 tid=0x00002b39c0006800 nid=0x5914 runnable [0x00002b394aa7b000]
   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 <0x00000006d240bfe0> (a sun.nio.ch.Util$3)
    - locked <0x00000006d240bfd0> (a java.util.Collections$UnmodifiableSet)
    - locked <0x00000006d240bf88> (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.awaitWritable(NioSocketConduit.java:233)
    at io.undertow.protocols.ssl.SslConduit.awaitWritable(SslConduit.java:459)
    at org.xnio.conduits.AbstractSinkConduit.awaitWritable(AbstractSinkConduit.java:66)
    at org.xnio.conduits.AbstractSinkConduit.awaitWritable(AbstractSinkConduit.java:66)
    at io.undertow.conduits.ChunkedStreamSinkConduit.awaitWritable(ChunkedStreamSinkConduit.java:361)
    at org.xnio.conduits.ConduitStreamSinkChannel.awaitWritable(ConduitStreamSinkChannel.java:134)
    at io.undertow.channels.DetachableStreamSinkChannel.awaitWritable(DetachableStreamSinkChannel.java:87)
    at io.undertow.server.HttpServerExchange$WriteDispatchChannel.awaitWritable(HttpServerExchange.java:1973)
    at org.xnio.channels.Channels.flushBlocking(Channels.java:64)
    at io.undertow.servlet.spec.ServletOutputStreamImpl.close(ServletOutputStreamImpl.java:609)
    at io.undertow.servlet.spec.HttpServletResponseImpl.closeStreamAndWriter(HttpServletResponseImpl.java:478)
    at io.undertow.servlet.spec.HttpServletResponseImpl.responseDone(HttpServletResponseImpl.java:561)