Q on Hung thread in WebSphere

I am seeing the following hung thread in our WebSphere log (version 6.1 fix pack 33) , does anyone know what it means and know how to fix it ?

[2/23/11 14:39:47:519 CST] 0000001b ThreadMonitor W   WSVR0605W: Thread "Default : 42" (00000085) has been active for 685067 milliseconds and may be hung.  There is/are 1 thread(s) in total in the server that may be hung.
      at java.net.SocketInputStream.socketRead0(Native Method)
      at java.net.SocketInputStream.read(SocketInputStream.java:155)
      at com.ibm.jsse2.a.a(a.java:188)
      at com.ibm.jsse2.a.a(a.java:232)
      at com.ibm.jsse2.pc.a(pc.java:211)
      at com.ibm.jsse2.pc.a(pc.java:355)
      at com.ibm.jsse2.e.read(e.java:1)
      at java.io.BufferedInputStream.fill(BufferedInputStream.java:229)
      at java.io.BufferedInputStream.read1(BufferedInputStream.java:267)
      at java.io.BufferedInputStream.read(BufferedInputStream.java:324)
      at java.io.FilterInputStream.read(FilterInputStream.java:134)
      at sun.net.www.protocol.http.HttpURLConnection$HttpInputStream.read(HttpURLConnection.java:2203)
      at org.apache.xerces.impl.XMLEntityManager$RewindableInputStream.read(Unknown Source)
      at org.apache.xerces.impl.io.UTF8Reader.read(Unknown Source)
      at org.apache.xerces.impl.XMLEntityScanner.load(Unknown Source)
      at org.apache.xerces.impl.XMLEntityScanner.skipSpaces(Unknown Source)
      at org.apache.xerces.impl.XMLDocumentScannerImpl$TrailingMiscDispatcher.dispatch(Unknown Source)
      at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)
      at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
      at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
      at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
      at org.apache.xerces.parsers.DOMParser.parse(Unknown Source)
      at com.lawson.efs.ers.framework.FrameworkCall.getXMLDocument(FrameworkCall.java:112)
      at com.lawson.efs.ers.framework.FrameworkCall.getEfsUserSession(FrameworkCall.java:253)
      at com.lawson.efs.ers.user.UserManager.getEfsUser(UserManager.java:274)
      at com.lawson.efs.ers.user.UserManager.getUser(UserManager.java:437)
      at com.lawson.efs.ers.web.RSSessionManager.validateSession(RSSessionManager.java:112)
      at com.ibm._jsp._ersValidateSession._jspService(_ersValidateSession.java:71)
      at com.ibm.ws.jsp.runtime.HttpJspBase.service(HttpJspBase.java:87)
      at javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
      at com.ibm.ws.webcontainer.servlet.ServletWrapper.service(ServletWrapper.java:1146)
      at com.ibm.ws.webcontainer.servlet.ServletWrapper.service(ServletWrapper.java:1087)
      at com.ibm.ws.webcontainer.filter.WebAppFilterChain.doFilter(WebAppFilterChain.java:118)
      at com.ibm.ws.webcontainer.filter.WebAppFilterChain._doFilter(WebAppFilterChain.java:87)
      at com.ibm.ws.webcontainer.filter.WebAppFilterManager.doFilter(WebAppFilterManager.java:848)
      at com.ibm.ws.webcontainer.filter.WebAppFilterManager.doFilter(WebAppFilterManager.java:691)
      at com.ibm.ws.webcontainer.servlet.ServletWrapper.handleRequest(ServletWrapper.java:588)
      at com.ibm.ws.wswebcontainer.servlet.ServletWrapper.handleRequest(ServletWrapper.java:525)
      at com.ibm.wsspi.webcontainer.servlet.GenericServletWrapper.handleRequest(GenericServletWrapper.java:122)
      at com.ibm.ws.jsp.webcontainerext.AbstractJSPExtensionServletWrapper.handleRequest(AbstractJSPExtensionServletWrapper.java:233)
      at com.ibm.ws.webcontainer.servlet.CacheServletWrapper.handleRequest(CacheServletWrapper.java:90)
      at com.ibm.ws.webcontainer.WebContainer.handleRequest(WebContainer.java:764)
      at com.ibm.ws.wswebcontainer.WebContainer.handleRequest(WebContainer.java:1478)
      at com.ibm.ws.webcontainer.channel.WCChannelLink.ready(WCChannelLink.java:133)
      at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.handleDiscrimination(HttpInboundLink.java:450)
      at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.handleNewRequest(HttpInboundLink.java:508)
      at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.processRequest(HttpInboundLink.java:296)
      at com.ibm.ws.http.channel.inbound.impl.HttpICLReadCallback.complete(HttpICLReadCallback.java:102)
      at com.ibm.ws.tcp.channel.impl.AioReadCompletionListener.futureCompleted(AioReadCompletionListener.java:165)
      at com.ibm.io.async.AbstractAsyncFuture.invokeCallback(AbstractAsyncFuture.java:217)
      at com.ibm.io.async.AsyncChannelFuture.fireCompletionActions(AsyncChannelFuture.java:161)
      at com.ibm.io.async.AsyncFuture.completed(AsyncFuture.java:136)
      at com.ibm.io.async.ResultHandler.complete(ResultHandler.java:196)
      at com.ibm.io.async.ResultHandler.runEventProcessingLoop(ResultHandler.java:751)
      at com.ibm.io.async.ResultHandler$2.run(ResultHandler.java:881)
      at com.ibm.ws.util.ThreadPool$Worker.run(ThreadPool.java:1497)