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Type: Bug
Resolution: Done
Priority: Critical
Fix Version/s: JBoss A-MQ 6.3
Affects Version/s: JBoss A-MQ 6.2.1
Component/s: broker, fabric8, leveldb
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When troubleshooting a stuck message issue in a fabric environment we discovered the following deadlock in the broker container:

Found one Java-level deadlock:
=============================
"ActiveMQ Transport: tcp:///X.X.X.X:36258@6146":
  waiting for ownable synchronizer 0x00000000c3002170, (a java.util.concurrent.locks.ReentrantReadWriteLock$NonfairSync),
  which is held by "ActiveMQ Broker[activemq-01] Scheduler"
"ActiveMQ Broker[activemq-01] Scheduler":
  waiting for ownable synchronizer 0x00000000c3293578, (a java.util.concurrent.locks.ReentrantLock$NonfairSync),
  which is held by "ActiveMQ Transport: tcp:///X.X.X.X:36258@6146"

Java stack information for the threads listed above:
===================================================
"ActiveMQ Transport: tcp:///X.X.X.X:36258@6146":
	at sun.misc.Unsafe.park(Native Method)
	- parking to wait for  <0x00000000c3002170> (a java.util.concurrent.locks.ReentrantReadWriteLock$NonfairSync)
	at java.util.concurrent.locks.LockSupport.park(LockSupport.java:186)
	at java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:834)
	at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireQueued(AbstractQueuedSynchronizer.java:867)
	at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquire(AbstractQueuedSynchronizer.java:1197)
	at java.util.concurrent.locks.ReentrantReadWriteLock$WriteLock.lock(ReentrantReadWriteLock.java:945)
	at org.apache.activemq.broker.region.Queue.doPendingCursorAdditions(Queue.java:765)
	at org.apache.activemq.broker.region.Queue.orderedCursorAdd(Queue.java:866)
	at org.apache.activemq.broker.region.Queue.doMessageSend(Queue.java:845)
	at org.apache.activemq.broker.region.Queue.send(Queue.java:723)
	at org.apache.activemq.broker.region.AbstractRegion.send(AbstractRegion.java:419)
	at org.apache.activemq.broker.region.RegionBroker.send(RegionBroker.java:468)
	at org.apache.activemq.broker.jmx.ManagedRegionBroker.send(ManagedRegionBroker.java:296)
	at org.apache.activemq.broker.BrokerFilter.send(BrokerFilter.java:152)
	at org.apache.activemq.broker.CompositeDestinationBroker.send(CompositeDestinationBroker.java:96)
	at org.apache.activemq.broker.TransactionBroker.send(TransactionBroker.java:293)
	at org.apache.activemq.broker.BrokerFilter.send(BrokerFilter.java:152)
	at org.apache.activemq.broker.MutableBrokerFilter.send(MutableBrokerFilter.java:157)
	at org.apache.activemq.util.BrokerSupport.doResend(BrokerSupport.java:68)
	at org.apache.activemq.util.BrokerSupport.resendNoCopy(BrokerSupport.java:38)
	at org.apache.activemq.broker.region.RegionBroker.sendToDeadLetterQueue(RegionBroker.java:805)
	at org.apache.activemq.broker.BrokerFilter.sendToDeadLetterQueue(BrokerFilter.java:318)
	at org.apache.activemq.advisory.AdvisoryBroker.sendToDeadLetterQueue(AdvisoryBroker.java:495)
	at org.apache.activemq.broker.BrokerFilter.sendToDeadLetterQueue(BrokerFilter.java:318)
	at org.apache.activemq.broker.BrokerFilter.sendToDeadLetterQueue(BrokerFilter.java:318)
	at org.apache.activemq.broker.BrokerFilter.sendToDeadLetterQueue(BrokerFilter.java:318)
	at org.apache.activemq.broker.MutableBrokerFilter.sendToDeadLetterQueue(MutableBrokerFilter.java:330)
	at org.apache.activemq.broker.region.RegionBroker.messageExpired(RegionBroker.java:766)
	at org.apache.activemq.broker.BrokerFilter.messageExpired(BrokerFilter.java:312)
	at org.apache.activemq.advisory.AdvisoryBroker.messageExpired(AdvisoryBroker.java:348)
	at org.apache.activemq.broker.BrokerFilter.messageExpired(BrokerFilter.java:312)
	at org.apache.activemq.broker.BrokerFilter.messageExpired(BrokerFilter.java:312)
	at org.apache.activemq.broker.BrokerFilter.messageExpired(BrokerFilter.java:312)
	at org.apache.activemq.broker.MutableBrokerFilter.messageExpired(MutableBrokerFilter.java:324)
	at org.apache.activemq.broker.region.Queue.messageExpired(Queue.java:1778)
	at org.apache.activemq.broker.region.PrefetchSubscription.acknowledge(PrefetchSubscription.java:294)
	- locked <0x00000000d4470820> (a java.lang.Object)
	at org.apache.activemq.broker.region.AbstractRegion.acknowledge(AbstractRegion.java:441)
	at org.apache.activemq.broker.region.RegionBroker.acknowledge(RegionBroker.java:484)
	at org.apache.activemq.broker.BrokerFilter.acknowledge(BrokerFilter.java:87)
	at org.apache.activemq.broker.BrokerFilter.acknowledge(BrokerFilter.java:87)
	at org.apache.activemq.broker.TransactionBroker.acknowledge(TransactionBroker.java:276)
	at org.apache.activemq.broker.BrokerFilter.acknowledge(BrokerFilter.java:87)
	at org.apache.activemq.broker.MutableBrokerFilter.acknowledge(MutableBrokerFilter.java:97)
	at org.apache.activemq.broker.TransportConnection.processMessageAck(TransportConnection.java:555)
	at org.apache.activemq.command.MessageAck.visit(MessageAck.java:245)
	at org.apache.activemq.broker.TransportConnection.service(TransportConnection.java:338)
	at org.apache.activemq.broker.TransportConnection$1.onCommand(TransportConnection.java:188)
	at org.apache.activemq.transport.MutexTransport.onCommand(MutexTransport.java:50)
	at org.apache.activemq.transport.WireFormatNegotiator.onCommand(WireFormatNegotiator.java:113)
	at org.apache.activemq.transport.AbstractInactivityMonitor.onCommand(AbstractInactivityMonitor.java:300)
	at org.apache.activemq.transport.TransportSupport.doConsume(TransportSupport.java:83)
	at org.apache.activemq.transport.tcp.TcpTransport.doRun(TcpTransport.java:214)
	at org.apache.activemq.transport.tcp.TcpTransport.run(TcpTransport.java:196)
	at java.lang.Thread.run(Thread.java:745)
"ActiveMQ Broker[activemq-01] Scheduler":
	at sun.misc.Unsafe.park(Native Method)
	- parking to wait for  <0x00000000c3293578> (a java.util.concurrent.locks.ReentrantLock$NonfairSync)
	at java.util.concurrent.locks.LockSupport.park(LockSupport.java:186)
	at java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:834)
	at java.util.concurrent.locks.AbstractQueuedSynchronizer.doAcquireInterruptibly(AbstractQueuedSynchronizer.java:894)
	at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireInterruptibly(AbstractQueuedSynchronizer.java:1221)
	at java.util.concurrent.locks.ReentrantLock.lockInterruptibly(ReentrantLock.java:340)
	at org.apache.activemq.broker.region.Queue.doMessageSend(Queue.java:823)
	at org.apache.activemq.broker.region.Queue.send(Queue.java:723)
	at org.apache.activemq.broker.region.AbstractRegion.send(AbstractRegion.java:419)
	at org.apache.activemq.broker.region.RegionBroker.send(RegionBroker.java:468)
	at org.apache.activemq.broker.jmx.ManagedRegionBroker.send(ManagedRegionBroker.java:296)
	at org.apache.activemq.broker.BrokerFilter.send(BrokerFilter.java:152)
	at org.apache.activemq.broker.CompositeDestinationBroker.send(CompositeDestinationBroker.java:96)
	at org.apache.activemq.broker.TransactionBroker.send(TransactionBroker.java:293)
	at org.apache.activemq.broker.BrokerFilter.send(BrokerFilter.java:152)
	at org.apache.activemq.broker.MutableBrokerFilter.send(MutableBrokerFilter.java:157)
	at org.apache.activemq.util.BrokerSupport.doResend(BrokerSupport.java:68)
	at org.apache.activemq.util.BrokerSupport.resendNoCopy(BrokerSupport.java:38)
	at org.apache.activemq.broker.region.RegionBroker.sendToDeadLetterQueue(RegionBroker.java:805)
	at org.apache.activemq.broker.BrokerFilter.sendToDeadLetterQueue(BrokerFilter.java:318)
	at org.apache.activemq.advisory.AdvisoryBroker.sendToDeadLetterQueue(AdvisoryBroker.java:495)
	at org.apache.activemq.broker.BrokerFilter.sendToDeadLetterQueue(BrokerFilter.java:318)
	at org.apache.activemq.broker.BrokerFilter.sendToDeadLetterQueue(BrokerFilter.java:318)
	at org.apache.activemq.broker.BrokerFilter.sendToDeadLetterQueue(BrokerFilter.java:318)
	at org.apache.activemq.broker.MutableBrokerFilter.sendToDeadLetterQueue(MutableBrokerFilter.java:330)
	at org.apache.activemq.broker.region.RegionBroker.messageExpired(RegionBroker.java:766)
	at org.apache.activemq.broker.BrokerFilter.messageExpired(BrokerFilter.java:312)
	at org.apache.activemq.advisory.AdvisoryBroker.messageExpired(AdvisoryBroker.java:348)
	at org.apache.activemq.broker.BrokerFilter.messageExpired(BrokerFilter.java:312)
	at org.apache.activemq.broker.BrokerFilter.messageExpired(BrokerFilter.java:312)
	at org.apache.activemq.broker.BrokerFilter.messageExpired(BrokerFilter.java:312)
	at org.apache.activemq.broker.MutableBrokerFilter.messageExpired(MutableBrokerFilter.java:324)
	at org.apache.activemq.broker.region.Queue.messageExpired(Queue.java:1778)
	at org.apache.activemq.broker.region.Queue.messageExpired(Queue.java:1772)
	at org.apache.activemq.broker.region.Queue.doPageInForDispatch(Queue.java:1905)
	at org.apache.activemq.broker.region.Queue.pageInMessages(Queue.java:2108)
	at org.apache.activemq.broker.region.Queue.doBrowse(Queue.java:1107)
	at org.apache.activemq.broker.region.Queue.expireMessages(Queue.java:900)
	at org.apache.activemq.broker.region.Queue.access$100(Queue.java:96)
	at org.apache.activemq.broker.region.Queue$2.run(Queue.java:139)
	at org.apache.activemq.thread.SchedulerTimerTask.run(SchedulerTimerTask.java:33)
	at java.util.TimerThread.mainLoop(Timer.java:555)
	at java.util.TimerThread.run(Timer.java:505)

We tried restarting the container and hit the deadlock again within a minute or two of restart. We tried explicitly disabling schedulerSupport in the broker, but still hit the same deadlock again after a restart. After moving the store (leveDB) to the side and restarting, the broker resumed processing.

Configuration is fairly "vanilla":

<beans
  xmlns="http://www.springframework.org/schema/beans"
  xmlns:amq="http://activemq.apache.org/schema/core"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
  http://activemq.apache.org/schema/core http://activemq.apache.org/schema/core/activemq-core.xsd">

    <!-- Allows us to use system properties and fabric as variables in this configuration file -->
    <bean class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
        <property name="properties">
            <bean class="io.fabric8.mq.fabric.ConfigurationProperties"/>
        </property>
    </bean>


    <broker xmlns="http://activemq.apache.org/schema/core" brokerName="${broker-name}" dataDirectory="${data}" start="false" restartAllowed="false">
        <destinationInterceptors>
            <virtualDestinationInterceptor>
                <virtualDestinations>
					<virtualTopic name="VirtualTopic.>" />				  
                </virtualDestinations>
            </virtualDestinationInterceptor>
        </destinationInterceptors>

	  	<destinationPolicy>
            <policyMap>
			    <policyEntries> 
                    <policyEntry topic="t.>" sendAdvisoryIfNoConsumers="true" advisoryForSlowConsumers="true" advisoryForDelivery="true" advisoryForConsumed="true" advisoryForDiscardingMessages="true" advisoryWhenFull="true" />
                    <policyEntry queue="q.>" sendAdvisoryIfNoConsumers="true" advisoryForSlowConsumers="true" advisoryForDelivery="true" advisoryForConsumed="true" advisoryForDiscardingMessages="true" advisoryWhenFull="true" />
			    </policyEntries>
		    </policyMap>
        </destinationPolicy>
	  
        <managementContext>
            <managementContext createConnector="false"/>
        </managementContext>

        <persistenceAdapter>
		    <levelDB directory="${data}/levelDB/${karaf.name}"/>
        </persistenceAdapter>

        <plugins>
            <jaasAuthenticationPlugin configuration="karaf" />
        </plugins>

        <systemUsage>
            <systemUsage sendFailIfNoSpaceAfterTimeout="30000">
                <memoryUsage>
                    <memoryUsage limit="512 mb"/>
                </memoryUsage>
                <storeUsage>
                    <storeUsage limit="100 gb"/>
                </storeUsage>
                <tempUsage>
                    <tempUsage limit="50 gb"/>
                </tempUsage>
            </systemUsage>
        </systemUsage>
	  
        <transportConnectors>
            <transportConnector name="openwire" uri="tcp://0.0.0.0:${openwire-port}"/>		    
        </transportConnectors>
    </broker>

</beans>

Note: We didn't clear the scheduler store; we can try that if the issue reoccurs.

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deadlock-sanitized.tdump
127 kB
2017/10/12 8:29 AM

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