Description of problem:

Possibility of this deadlock is introduced after r2682 from bz-1410869

"http-executor-threads - 49":
	at org.apache.tomcat.websocket.WsSession.onClose(WsSession.java:464)
	- waiting to lock <0x00000007a1b2f9d0> (a java.lang.Object)
	at org.apache.tomcat.websocket.WsFrameBase.processDataControl(WsFrameBase.java:336)
	at org.apache.tomcat.websocket.WsFrameBase.processData(WsFrameBase.java:278)
	at org.apache.tomcat.websocket.WsFrameBase.processInputBuffer(WsFrameBase.java:128)
	at org.apache.tomcat.websocket.server.WsFrameServer.onDataAvailable(WsFrameServer.java:56)
	- locked <0x00000007a1b2f120> (a java.lang.Object)
	at org.apache.tomcat.websocket.server.WsHttpUpgradeHandler$WsReadListener.onDataAvailable(WsHttpUpgradeHandler.java:197)
	at org.apache.catalina.core.StandardWrapperValve.async(StandardWrapperValve.java:585)
	at org.apache.catalina.core.StandardWrapperValve.event(StandardWrapperValve.java:350)
	at org.apache.catalina.core.StandardContextValve.event(StandardContextValve.java:171)
	at org.jboss.modcluster.container.jbossweb.JBossWebContext$RequestListenerValve.event(JBossWebContext.java:89)
	at org.apache.catalina.valves.ValveBase.event(ValveBase.java:185)
	at org.apache.catalina.core.StandardHostValve.event(StandardHostValve.java:253)
	at org.apache.catalina.valves.ValveBase.event(ValveBase.java:185)
	at org.apache.catalina.core.StandardEngineValve.event(StandardEngineValve.java:121)
	at org.apache.catalina.connector.CoyoteAdapter.event(CoyoteAdapter.java:227)
	at org.apache.coyote.http11.Http11NioProcessor.event(Http11NioProcessor.java:232)
	at org.apache.coyote.http11.Http11NioProtocol$Http11ConnectionHandler.event(Http11NioProtocol.java:819)
	- locked <0x00000007a11ceff8> (a org.apache.coyote.Request)
	at org.apache.coyote.http11.Http11NioProtocol$Http11ConnectionHandler.event(Http11NioProtocol.java:872)
	- locked <0x00000007a11ceff8> (a org.apache.coyote.Request)
	at org.apache.tomcat.util.net.NioEndpoint$ChannelProcessor.run(NioEndpoint.java:940)
	- locked <0x00000007a1b2eb10> (a java.lang.Object)
	at org.jboss.threads.SimpleDirectExecutor.execute(SimpleDirectExecutor.java:33)
	at org.jboss.threads.QueueExecutor.runTask(QueueExecutor.java:808)
	at org.jboss.threads.QueueExecutor.access$100(QueueExecutor.java:45)
	at org.jboss.threads.QueueExecutor$Worker.run(QueueExecutor.java:849)
	at java.lang.Thread.run(Thread.java:745)
	at org.jboss.threads.JBossThread.run(JBossThread.java:122)
"4579":
	at org.apache.catalina.connector.HttpEventImpl.close(HttpEventImpl.java:76)
	- waiting to lock <0x00000007a11ceff8> (a org.apache.coyote.Request)
	at org.apache.catalina.connector.OutputBuffer.close(OutputBuffer.java:305)
	at org.apache.catalina.connector.CoyoteOutputStream.close(CoyoteOutputStream.java:106)
	at org.apache.tomcat.websocket.server.WsRemoteEndpointImplServer.doClose(WsRemoteEndpointImplServer.java:143)
	at org.apache.tomcat.websocket.WsRemoteEndpointImplBase.close(WsRemoteEndpointImplBase.java:648)
	at org.apache.tomcat.websocket.WsSession.sendCloseMessage(WsSession.java:542)
	at org.apache.tomcat.websocket.WsSession.doClose(WsSession.java:438)
	- locked <0x00000007a1b2f9d0> (a java.lang.Object)
	at org.apache.tomcat.websocket.WsSession.close(WsSession.java:407)