[jgroups-users] Deadlock in JGroups

Hello All,

I need some help here. We are using jboss-4.2.0-GA with Jgroups 2.4.1 SP-3 on jdk 1.6 in a clustered environment of 60 servers. It runs fine for days but suddenly all threads get blocked for several minutes.  I have captured thread dumps when this happened yesterday.  We are seeing below in all the thread dumps. Appreciate any help. Should i upgrade jgroups to solve this issue?.

daemon prio=10 tid=0x00007f54d80f0000 nid=0x464 in Object.wait() [0x00007f548a907000]
     java.lang.Thread.State: TIMED_WAITING (on object monitor)
     at java.lang.Object.wait(Native Method)
     - waiting on <0x00000007ddd76e50> (a java.util.HashMap)
     at org.jgroups.blocks.GroupRequest.doExecute(GroupRequest.java:501)
     - locked < 0x00000007ddd76e50> (a java.util.HashMap)
     at org.jgroups.blocks.GroupRequest.execute(GroupRequest.java:193)
     at org.jgroups.blocks.MessageDispatcher.castMessage(MessageDispatcher.java:431)
     at org.jgroups.blocks.RpcDispatcher.callRemoteMethods(RpcDispatcher.java:192)
     at org.jgroups.blocks.RpcDispatcher.callRemoteMethods(RpcDispatcher.java:163)
     at org.jboss.ha.framework.server.HAPartitionImpl.callMethodOnCluster(HAPartitionImpl.java:797)
     at org.jboss.ha.framework.server.HAPartitionImpl.callMethodOnCluster(HAPartitionImpl.java:773)
     at org.jboss.ha.jndi.TreeHead.lookup(TreeHead.java:228)
     at org.jboss.ha.jndi.HAJNDI.lookup(HAJNDI.java:155)
     at sun.reflect.GeneratedMethodAccessor189.invoke(Unknown Source)
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
     at java.lang.reflect.Method.invoke(Method.java:597)
     at org.jboss.ha.framework.interfaces.HARMIClient.invoke(HARMIClient.java:258)
     at $Proxy332.lookup(Unknown Source)
     at org.jnp.interfaces.NamingContext.lookup(NamingContext.java:625)
     at org.jnp.interfaces.NamingContext.lookup(NamingContext.java:587)
     at javax.naming.InitialContext.lookup(InitialContext.java:392)
     at tlm.toc.common.utils.JNDIUtils.lookup(JNDIUtils.java:128)
     - locked < 0x0000000780d72b70> (a java.util.HashMap)
     at hti.provisioning.ws.ProvisioningWS.tcuProvisioningCommand(ProvisioningWS.java:80)
     at sun.reflect.GeneratedMethodAccessor221.invoke(Unknown Source)
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)


Thanks,
Vamshi J.

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