The EAP 6 CLI deadlocks while closing

Issue

• We have a bash CLI script, and the script randomly fails to complete.
• After CLI completes our commands and it is closing, it appears that the CLI hits the following deadlock, preventing it from terminating properly:

"Remoting "cli-client" read-1" prio=10 tid=0x0000000006929800 nid=0x1047 waiting for monitor entry [0x00000000422b2000]
   java.lang.Thread.State: BLOCKED (on object monitor)
    at org.jboss.as.cli.impl.CLIModelControllerClient$ChannelCloseHandler.handleClose(CLIModelControllerClient.java:275)
    - waiting to lock <0x00000000e5a66040> (a java.lang.String)
    at org.jboss.as.cli.impl.CLIModelControllerClient$ChannelCloseHandler.handleClose(CLIModelControllerClient.java:261)
    at org.jboss.remoting3.spi.SpiUtils.safeHandleClose(SpiUtils.java:54)
    at org.jboss.remoting3.spi.AbstractHandleableCloseable$CloseHandlerTask.run(AbstractHandleableCloseable.java:501)
    at org.jboss.remoting3.spi.AbstractHandleableCloseable.runCloseTask(AbstractHandleableCloseable.java:406)
    at org.jboss.remoting3.spi.AbstractHandleableCloseable.closeComplete(AbstractHandleableCloseable.java:277)
    at org.jboss.remoting3.remote.RemoteConnectionChannel.closeAction(RemoteConnectionChannel.java:515)
    at org.jboss.remoting3.spi.AbstractHandleableCloseable.closeAsync(AbstractHandleableCloseable.java:359)
    at org.jboss.remoting3.remote.RemoteConnectionHandler.closeAllChannels(RemoteConnectionHandler.java:390)
    - locked <0x00000000e5e5b050> (a org.jboss.remoting3.remote.RemoteConnection)
    at org.jboss.remoting3.remote.RemoteConnectionHandler.handleConnectionClose(RemoteConnectionHandler.java:108)
    at org.jboss.remoting3.remote.RemoteReadListener.handleEvent(RemoteReadListener.java:78)
    at org.jboss.remoting3.remote.RemoteReadListener.handleEvent(RemoteReadListener.java:45)
    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:180)
    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:187)

"main" prio=10 tid=0x0000000005af1800 nid=0x103b waiting for monitor entry [0x00000000413ab000]
   java.lang.Thread.State: BLOCKED (on object monitor)
    at org.jboss.remoting3.remote.RemoteConnectionHandler.closeAllChannels(RemoteConnectionHandler.java:389)
    - waiting to lock <0x00000000e5e5b050> (a org.jboss.remoting3.remote.RemoteConnection)
    at org.jboss.remoting3.remote.RemoteConnectionHandler.sendCloseRequest(RemoteConnectionHandler.java:231)
    at org.jboss.remoting3.remote.RemoteConnectionHandler.closeAction(RemoteConnectionHandler.java:376)
    at org.jboss.remoting3.spi.AbstractHandleableCloseable.closeAsync(AbstractHandleableCloseable.java:359)
    at org.jboss.remoting3.ConnectionImpl.closeAction(ConnectionImpl.java:52)
    at org.jboss.remoting3.spi.AbstractHandleableCloseable.close(AbstractHandleableCloseable.java:153)
    at org.jboss.as.protocol.StreamUtils.safeClose(StreamUtils.java:66)
    at org.jboss.as.protocol.ProtocolConnectionManager.shutdown(ProtocolConnectionManager.java:110)
    at org.jboss.as.protocol.mgmt.FutureManagementChannel$Establishing.close(FutureManagementChannel.java:193)
    at org.jboss.as.protocol.StreamUtils.safeClose(StreamUtils.java:66)
    at org.jboss.as.cli.impl.CLIModelControllerClient.close(CLIModelControllerClient.java:174)
    - locked <0x00000000e5a66040> (a java.lang.String)
    at org.jboss.as.protocol.StreamUtils.safeClose(StreamUtils.java:66)
    at org.jboss.as.cli.impl.CommandContextImpl.disconnectController(CommandContextImpl.java:901)
    at org.jboss.as.cli.impl.CommandContextImpl.terminateSession(CommandContextImpl.java:581)
    at org.jboss.as.cli.impl.CliLauncher.processCommands(CliLauncher.java:286)
    at org.jboss.as.cli.impl.CliLauncher.main(CliLauncher.java:231)
    at org.jboss.as.cli.CommandLineMain.main(CommandLineMain.java:34)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:601)
    at org.jboss.modules.Module.run(Module.java:270)
    at org.jboss.modules.Main.main(Main.java:294)