Clustered stateful session bean removal of expired passivated instances causes
deadlock
---------------------------------------------------------------------------------------
Key: JBAS-1560
URL: http://jira.jboss.com/jira/browse/JBAS-1560
Project: JBoss Application Server
Type: Bug
Components: EJBs
Versions: JBossAS-4.0.1 Final, JBossAS-3.2.7 Final, JBossAS-4.0.1 SP1
Reporter: Scott M Stark
Assigned to: Scott M Stark
Priority: Critical
Fix For: JBossAS-5.0 Alpha, JBossAS-4.0.2 Final, JBossAS-4.0.2RC1,
JBossAS-3.2.8 Final
The background processing of expired stateful sessions that have been
passivated can result in deadlock when clustering is used due to the fact that
removal of the stateful session occurs with the cache lock held. This conflicts
with removal requests sent to invalidate a cache entry. The deadlock is
illustrated by the following 3.2.6 traces:
"Thread-25" daemon prio=1 tid=0x89648448 nid=0x3805 in Object.wait()
[8aaed000..8aaed87c]
at java.lang.Object.wait(Native Method)
at org.jgroups.blocks.GroupRequest.doExecute(GroupRequest.java:505)
at org.jgroups.blocks.GroupRequest.execute(GroupRequest.java:183)
- locked <0x9b8ea9e8> (a java.lang.Object)
at org.jgroups.blocks.MessageDispatcher.castMessage(MessageDispatcher.java:384)
at org.jgroups.blocks.RpcDispatcher.callRemoteMethods(RpcDispatcher.java:134)
at
org.jboss.ha.framework.server.HAPartitionImpl.callMethodOnCluster(HAPartitionImpl.java:620)
at
org.jboss.ha.hasessionstate.server.HASessionStateImpl.removeSession(HASessionStateImpl.java:533)
at
org.jboss.ejb.plugins.StatefulHASessionPersistenceManager.removePassivated(StatefulHASessionPersistenceManager.java:219)
at
org.jboss.ejb.plugins.StatefulSessionInstanceCache.removePassivated(StatefulSessionInstanceCache.java:193)
at
org.jboss.ejb.plugins.LRUStatefulContextCachePolicy$RemoverTask.run(LRUStatefulContextCachePolicy.java:146)
- locked <0x9296b8c0> (a java.lang.Object)
at java.util.TimerThread.mainLoop(Timer.java:432)
at java.util.TimerThread.run(Timer.java:382)
"MessageDispatcher up processing thread" daemon prio=1 tid=0x086c06b0
nid=0x3805 waiting for monitor entry [8b788000..8b78887c]
at
org.jboss.ejb.plugins.AbstractInstanceCache.remove(AbstractInstanceCache.java:206)
- waiting to lock <0x9296b8c0> (a java.lang.Object)
at
org.jboss.ejb.plugins.StatefulHASessionPersistenceManager.sessionExternallyModified(StatefulHASessionPersistenceManager.java:231)
at
org.jboss.ha.hasessionstate.server.HASessionStateImpl.ownedObjectExternallyModified(HASessionStateImpl.java:587)
at
org.jboss.ha.hasessionstate.server.HASessionStateImpl._setOwnership(HASessionStateImpl.java:504)
at sun.reflect.GeneratedMethodAccessor400.invoke(Unknown Source)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
at org.jgroups.blocks.MethodCall.invoke(MethodCall.java:236)
at
org.jboss.ha.framework.server.HAPartitionImpl.handle(HAPartitionImpl.java:828)
at
org.jgroups.blocks.RequestCorrelator.handleRequest(RequestCorrelator.java:615)
at
org.jgroups.blocks.RequestCorrelator.receiveMessage(RequestCorrelator.java:512)
at org.jgroups.blocks.RequestCorrelator.receive(RequestCorrelator.java:326)
at
org.jgroups.blocks.MessageDispatcher$ProtocolAdapter.handleUp(MessageDispatcher.java:722)
at
org.jgroups.blocks.MessageDispatcher$ProtocolAdapter.access$300(MessageDispatcher.java:554)
at org.jgroups.blocks.MessageDispatcher$1.run(MessageDispatcher.java:691)
at java.lang.Thread.run(Thread.java:534)
The background removal of the expired passivated sessions should not be done
with the cache lock held.
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