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From "Timothy Bish (JIRA)" <j...@apache.org>
Subject [jira] [Assigned] (AMQ-3873) Occasional deadlock during startup
Date Fri, 15 Jun 2012 13:55:42 GMT

     [ https://issues.apache.org/jira/browse/AMQ-3873?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Timothy Bish reassigned AMQ-3873:
---------------------------------

    Assignee: Timothy Bish
    
> Occasional deadlock during startup
> ----------------------------------
>
>                 Key: AMQ-3873
>                 URL: https://issues.apache.org/jira/browse/AMQ-3873
>             Project: ActiveMQ
>          Issue Type: Bug
>    Affects Versions: 5.6.0
>         Environment: Suse Linux, CentOS Linux
> Out-of-the-Box standalone broker with additional beans
>            Reporter: Ron Koerner
>            Assignee: Timothy Bish
>
> During startup I occasionally get deadlocks. I never had those on earlier versions including
a 5.6-SNAPSHOT from January.
> My activemq.xml contains a number of beans which each autowire the BrokerService and
make connections to brokerService.getVmConnectorURI().toString()+"?async=false"
> To avoid beans to be started faster than the broker and create a second broker by trying
to connect, the broker is instantiated with start=false and a special bean listening for the
Spring ContextRefreshedEvent will start the broker and run each beans connection methods.
> Therefore a number of VmConnections will be done serially but in a rapid succession.
> This fails at different points, but always with the following thread lock analysis:
> {code}
> Found one Java-level deadlock:
> =============================
> "ActiveMQ Task-3":
>   waiting for ownable synchronizer 0x9f288120, (a java.util.concurrent.locks.ReentrantLock$NonfairSync),
>   which is held by "BrokerService[smcufs02] Task-1"
> "BrokerService[smcufs02] Task-1":
>   waiting to lock monitor 0x0807a650 (object 0x9f2880d8, a java.util.concurrent.atomic.AtomicBoolean),
>   which is held by "ActiveMQ Task-3"
> Java stack information for the threads listed above:
> ===================================================
> "ActiveMQ Task-3":
>         at sun.misc.Unsafe.park(Native Method)
>         - parking to wait for  <0x9f288120> (a java.util.concurrent.locks.ReentrantLock$NonfairSync)
>         at java.util.concurrent.locks.LockSupport.park(LockSupport.java:158)
>         at java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:747)
>         at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireQueued(AbstractQueuedSynchronizer.java:778)
>         at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquire(AbstractQueuedSynchronizer.java:1114)
>         at java.util.concurrent.locks.ReentrantLock$NonfairSync.lock(ReentrantLock.java:186)
>         at java.util.concurrent.locks.ReentrantLock.lock(ReentrantLock.java:262)
>         at org.apache.activemq.transport.MutexTransport.oneway(MutexTransport.java:66)
>         at org.apache.activemq.transport.ResponseCorrelator.oneway(ResponseCorrelator.java:60)
>         at org.apache.activemq.broker.TransportConnection.dispatch(TransportConnection.java:1307)
>         at org.apache.activemq.broker.TransportConnection.processDispatch(TransportConnection.java:837)
>         at org.apache.activemq.broker.TransportConnection.dispatchSync(TransportConnection.java:798)
>         at org.apache.activemq.broker.TransportConnection$1.onCommand(TransportConnection.java:152)
>         at org.apache.activemq.transport.ResponseCorrelator.onCommand(ResponseCorrelator.java:116)
>         at org.apache.activemq.transport.MutexTransport.onCommand(MutexTransport.java:50)
>         at org.apache.activemq.transport.vm.VMTransport.doDispatch(VMTransport.java:135)
>         at org.apache.activemq.transport.vm.VMTransport.start(VMTransport.java:156)
>         - locked <0x9f2880d8> (a java.util.concurrent.atomic.AtomicBoolean)
>         at org.apache.activemq.transport.TransportFilter.start(TransportFilter.java:58)
>         at org.apache.activemq.transport.TransportFilter.start(TransportFilter.java:58)
>         at org.apache.activemq.broker.TransportConnection.start(TransportConnection.java:914)
>         - locked <0x9f2e4f98> (a org.apache.activemq.broker.TransportConnection)
>         at org.apache.activemq.broker.TransportConnector$1$1.run(TransportConnector.java:227)
>         at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
>         at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
>         at java.lang.Thread.run(Thread.java:619)
> "BrokerService[smcufs02] Task-1":
>         at org.apache.activemq.transport.vm.VMTransport.dispatch(VMTransport.java:114)
>         - waiting to lock <0x9f2880d8> (a java.util.concurrent.atomic.AtomicBoolean)
>         at org.apache.activemq.transport.vm.VMTransport.oneway(VMTransport.java:103)
>         at org.apache.activemq.transport.MutexTransport.oneway(MutexTransport.java:68)
>         at org.apache.activemq.transport.ResponseCorrelator.oneway(ResponseCorrelator.java:60)
>         at org.apache.activemq.broker.TransportConnection.dispatch(TransportConnection.java:1307)
>         at org.apache.activemq.broker.TransportConnection.processDispatch(TransportConnection.java:837)
>         at org.apache.activemq.broker.TransportConnection.iterate(TransportConnection.java:872)
>         at org.apache.activemq.thread.PooledTaskRunner.runTask(PooledTaskRunner.java:122)
>         at org.apache.activemq.thread.PooledTaskRunner$1.run(PooledTaskRunner.java:43)
>         at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
>         at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
>         at java.lang.Thread.run(Thread.java:619)
> Found 1 deadlock.
> {code}

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