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https://issues.apache.org/activemq/browse/AMQ-2054?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Gary Tully resolved AMQ-2054.
-----------------------------
Resolution: Fixed
Fix Version/s: 5.3.0
patch applied in r734256 with thanks.
> Deadlock in org.apache.activemq.usage.Usage
> -------------------------------------------
>
> Key: AMQ-2054
> URL: https://issues.apache.org/activemq/browse/AMQ-2054
> Project: ActiveMQ
> Issue Type: Bug
> Components: Broker
> Affects Versions: 5.2.0
> Reporter: Danielius Jurna
> Assignee: Gary Tully
> Priority: Critical
> Fix For: 5.3.0
>
> Attachments: Usage.java.patch
>
>
> In highly concurrent environment, client deadlocks with this stack trace.
> Obiously, there are too many synchronized statements in Usage class. Either
> you add statements on method declaration, or use synchronized on mutex
> object. Now for example stop method is declared as synchronized and also
> locks usageMutex and this causes deadlock.
> Found one Java-level deadlock:
> =============================
> "jmsConnector.dispatcher.486":
> waiting to lock monitor 0x08528fb0 (object 0xa4b01390, a java.lang.Object),
> which is held by "ActiveMQ Transport: tcp://localhost/127.0.0.1:61616"
> "ActiveMQ Transport: tcp://localhost/127.0.0.1:61616":
> waiting to lock monitor 0x08528a38 (object 0xa4b01348, a
> org.apache.activemq.usage.MemoryUsage),
> which is held by "jmsConnector.dispatcher.486"
> Java stack information for the threads listed above:
> ===================================================
> "jmsConnector.dispatcher.486":
> at org.apache.activemq.usage.Usage.stop(Usage.java:306)
> - waiting to lock <0xa4b01390> (a java.lang.Object)
> - locked <0xa4b01348> (a org.apache.activemq.usage.MemoryUsage)
> at
> org.apache.activemq.ActiveMQMessageProducer.dispose(ActiveMQMessageProducer.java:156)
> at
> org.apache.activemq.ActiveMQSession.dispose(ActiveMQSession.java:589)
> - locked <0xa4b091d8> (a org.apache.activemq.ActiveMQSession)
> at org.apache.activemq.ActiveMQSession.close(ActiveMQSession.java:555)
> at
> org.apache.activemq.pool.SessionPool.destroyObject(SessionPool.java:81)
> at
> org.apache.commons.pool.impl.GenericObjectPool.addObjectToPool(GenericObjectPool.java:1128)
> at
> org.apache.commons.pool.impl.GenericObjectPool.returnObject(GenericObjectPool.java:1076)
> at
> org.apache.activemq.pool.SessionPool.returnSession(SessionPool.java:67)
> at
> org.apache.activemq.pool.PooledSession.close(PooledSession.java:124)
> at org.mule.providers.jms.JmsConnector.close(JmsConnector.java:1003)
> at
> org.mule.providers.jms.JmsConnector.closeQuietly(JmsConnector.java:1017)
> at
> org.mule.providers.jms.JmsMessageDispatcher.dispatchMessage(JmsMessageDispatcher.java:323)
> at
> org.mule.providers.jms.JmsMessageDispatcher.doDispatch(JmsMessageDispatcher.java:64)
> at
> org.mule.providers.AbstractMessageDispatcher$Worker.run(AbstractMessageDispatcher.java:561)
> at org.mule.impl.work.WorkerContext.run(WorkerContext.java:310)
> at
> edu.emory.mathcs.backport.java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:987)
> at
> edu.emory.mathcs.backport.java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:528)
> at java.lang.Thread.run(Thread.java:619)
> "ActiveMQ Transport: tcp://localhost/127.0.0.1:61616":
> at org.apache.activemq.usage.Usage.getExecutor(Usage.java:404)
> - waiting to lock <0xa4b01348> (a
> org.apache.activemq.usage.MemoryUsage)
> at org.apache.activemq.usage.Usage.fireEvent(Usage.java:271)
> at org.apache.activemq.usage.Usage.setPercentUsage(Usage.java:232)
> - locked <0xa4b01390> (a java.lang.Object)
> at
> org.apache.activemq.usage.MemoryUsage.decreaseUsage(MemoryUsage.java:146)
> at
> org.apache.activemq.ActiveMQMessageProducer.onProducerAck(ActiveMQMessageProducer.java:289)
> at
> org.apache.activemq.ActiveMQConnection$2.processProducerAck(ActiveMQConnection.java:1675)
> at org.apache.activemq.command.ProducerAck.visit(ProducerAck.java:56)
> at
> org.apache.activemq.ActiveMQConnection.onCommand(ActiveMQConnection.java:1647)
> at
> org.apache.activemq.transport.ResponseCorrelator.onCommand(ResponseCorrelator.java:104)
> at
> org.apache.activemq.transport.TransportFilter.onCommand(TransportFilter.java:68)
> at
> org.apache.activemq.transport.failover.FailoverTransport$3.onCommand(FailoverTransport.java:167)
> at
> org.apache.activemq.transport.WireFormatNegotiator.onCommand(WireFormatNegotiator.java:143)
> at
> org.apache.activemq.transport.InactivityMonitor.onCommand(InactivityMonitor.java:206)
> - locked <0x752c53e8> (a
> org.apache.activemq.transport.InactivityMonitor$1)
> at
> org.apache.activemq.transport.TransportSupport.doConsume(TransportSupport.java:84)
> at
> org.apache.activemq.transport.tcp.TcpTransport.doRun(TcpTransport.java:203)
> at
> org.apache.activemq.transport.tcp.TcpTransport.run(TcpTransport.java:185)
> at java.lang.Thread.run(Thread.java:619)
> Found 1 deadlock.
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