Deadlock in MultiThreadedHttpConnectionManager.shutdown

Issue

• We see a deadlock like below in MultiThreadedHttpConnectionManager.shutdown

"ODEServer-570":
  waiting to lock Monitor@0x000000007794d7d8 (Object@0x00000004ea9810f0, a java/util/HashMap),
  which is held by "ServerService Thread Pool -- 90"
"ServerService Thread Pool -- 90":
  waiting to lock Monitor@0x000000006e9756f8 (Object@0x00000004eb0f6288, a org/apache/commons/httpclient/MultiThreadedHttpConnectionManager$ConnectionPool),
  which is held by "ODEServer-570"

Thread 388: (state = BLOCKED)
 - org.apache.commons.httpclient.MultiThreadedHttpConnectionManager.shutdown() @bci=7, line=276 (Interpreted frame)
 - org.apache.commons.httpclient.MultiThreadedHttpConnectionManager.shutdownAll() @bci=56, line=129 (Interpreted frame)
 - org.apache.axis2.transport.http.AxisServlet.destroy() @bci=46, line=523 (Interpreted frame)
 - org.apache.ode.axis2.hooks.ODEAxisServlet.destroy() @bci=1, line=67 (Interpreted frame)
 - sun.reflect.NativeMethodAccessorImpl.invoke0(java.lang.reflect.Method, java.lang.Object, java.lang.Object[]) @bci=0 (Interpreted frame)
 - sun.reflect.NativeMethodAccessorImpl.invoke(java.lang.Object, java.lang.Object[]) @bci=87, line=57 (Interpreted frame)
 - sun.reflect.DelegatingMethodAccessorImpl.invoke(java.lang.Object, java.lang.Object[]) @bci=6, line=43 (Compiled frame)
 - java.lang.reflect.Method.invoke(java.lang.Object, java.lang.Object[]) @bci=57, line=606 (Compiled frame)
 - org.apache.catalina.security.SecurityUtil$1.run() @bci=12, line=264 (Interpreted frame)
 - org.apache.catalina.security.SecurityUtil$1.run() @bci=1, line=262 (Interpreted frame)
 - java.security.AccessController.doPrivileged(java.security.PrivilegedExceptionAction, java.security.AccessControlContext) @bci=0 (Interpreted frame)
 - javax.security.auth.Subject.doAsPrivileged(javax.security.auth.Subject, java.security.PrivilegedExceptionAction, java.security.AccessControlContext) @bci=59, line=536 (Interpreted frame)
 - org.apache.catalina.security.SecurityUtil.execute(java.lang.reflect.Method, java.lang.Object, java.lang.Object[], java.security.Principal) @bci=136, line=296 (Interpreted frame)
 - org.apache.catalina.security.SecurityUtil.doAsPrivilege(java.lang.String, javax.servlet.Servlet, java.lang.Class[], java.lang.Object[], java.security.Principal) @bci=74, line=156 (Interpreted frame)
 - org.apache.catalina.security.SecurityUtil.doAsPrivilege(java.lang.String, javax.servlet.Servlet) @bci=5, line=87 (Interpreted frame)
 - org.apache.catalina.core.StandardWrapper.unload() @bci=49, line=1369 (Interpreted frame)
 - org.apache.catalina.core.StandardWrapper.stop() @bci=49, line=1669 (Interpreted frame)
 - org.apache.catalina.core.StandardContext.stop() @bci=110, line=3906 (Interpreted frame)
 - org.jboss.as.web.deployment.WebDeploymentService.doStop() @bci=19, line=171 (Interpreted frame)
...
Thread 387: (state = BLOCKED)
 - org.apache.commons.httpclient.MultiThreadedHttpConnectionManager.removeReferenceToConnection(org.apache.commons.httpclient.MultiThreadedHttpConnectionManager$HttpConnectionWithReference) @bci=6, line=233 (Interpreted frame)
 - org.apache.commons.httpclient.MultiThreadedHttpConnectionManager.access$1300(org.apache.commons.httpclient.MultiThreadedHttpConnectionManager$HttpConnectionWithReference) @bci=1, line=65 (Interpreted frame)
 - org.apache.commons.httpclient.MultiThreadedHttpConnectionManager$ConnectionPool.freeConnection(org.apache.commons.httpclient.HttpConnection) @bci=140, line=1005 (Interpreted frame)
 - org.apache.commons.httpclient.MultiThreadedHttpConnectionManager.releaseConnection(org.apache.commons.httpclient.HttpConnection) @bci=34, line=643 (Interpreted frame)
 - org.apache.commons.httpclient.HttpConnection.releaseConnection() @bci=52, line=1179 (Interpreted frame)
 - org.apache.commons.httpclient.MultiThreadedHttpConnectionManager$HttpConnectionAdapter.releaseConnection() @bci=25, line=1423 (Interpreted frame)
 - org.apache.commons.httpclient.HttpMethodBase.ensureConnectionRelease() @bci=11, line=2430 (Interpreted frame)
 - org.apache.commons.httpclient.HttpMethodBase.responseBodyConsumed() @bci=113, line=2422 (Interpreted frame)
 - org.apache.commons.httpclient.HttpMethodBase$1.responseConsumed() @bci=4, line=1892 (Interpreted frame)
 - org.apache.commons.httpclient.AutoCloseInputStream.notifyWatcher() @bci=27, line=198 (Interpreted frame)
 - org.apache.commons.httpclient.AutoCloseInputStream.close() @bci=13, line=158 (Interpreted frame)
 - org.apache.commons.httpclient.HttpMethodBase.releaseConnection() @bci=11, line=1181 (Interpreted frame)
 - org.apache.axis2.transport.http.CommonsHTTPTransportSender.cleanup(org.apache.axis2.context.MessageContext) @bci=15, line=84 (Interpreted frame)
...