[AMQ-1818] transport deadlock attempting to shutdown the broker

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 5.1.0
• Fix Version/s: 5.2.0
• Component/s: Transport

Environment

Red Hat Desktop release 4 (Nahant Update 4)
Linux ecbuild-lin1 2.6.9-42.ELsmp #1 SMP Wed Jul 12 23:27:17 EDT 2006 i686 i686 i386 GNU/Linux
ActiveMQ 5.1.0

• Assignee: Robert Davies
• Reporter: Scott Stanton
• Created: 20/Jun/08 18:16
• Updated: 08/Oct/08 08:49
• Resolved: 23/Sep/08 06:56

Description

While attempting to shutdown a JVM with an embedded broker listening on a stomp+ssl port, I ran into the following deadlock:

Found one Java-level deadlock:
=============================
"ActiveMQ Transport: ssl:///127.0.0.1:43713":
  waiting to lock monitor 0x8d587f70 (object 0x9b8362b0, a java.lang.Object),
  which is held by "BrokerService"
"BrokerService":
  waiting to lock monitor 0x08901314 (object 0x9b8527b0, a java.lang.Object),
  which is held by "ActiveMQ Transport: ssl:///127.0.0.1:43713"

Java stack information for the threads listed above:
===================================================
"ActiveMQ Transport: ssl:///127.0.0.1:43713":
	at org.apache.activemq.transport.MutexTransport.oneway(MutexTransport.java:40)
	- waiting to lock <0x9b8362b0> (a java.lang.Object)
	at org.apache.activemq.broker.TransportConnection.dispatch(TransportConnection.java:1188)
	at org.apache.activemq.broker.TransportConnection.processDispatch(TransportConnection.java:776)
	at org.apache.activemq.broker.TransportConnection.dispatchSync(TransportConnection.java:735)
	at org.apache.activemq.broker.TransportConnection$1.onCommand(TransportConnection.java:182)
	at org.apache.activemq.transport.TransportFilter.onCommand(TransportFilter.java:68)
	at org.apache.activemq.transport.InactivityMonitor.onCommand(InactivityMonitor.java:206)
	- locked <0x9b852bb0> (a org.apache.activemq.transport.InactivityMonitor$1)
	at org.apache.activemq.transport.stomp.StompTransportFilter.sendToActiveMQ(StompTransportFilter.java:80)
	- locked <0x9b8527b0> (a java.lang.Object)
	at org.apache.activemq.transport.stomp.ProtocolConverter.sendToActiveMQ(ProtocolConverter.java:134)
	at org.apache.activemq.transport.stomp.ProtocolConverter.onStompUnsubscribe(ProtocolConverter.java:424)
	at org.apache.activemq.transport.stomp.ProtocolConverter.onStompCommad(ProtocolConverter.java:184)
	at org.apache.activemq.transport.stomp.StompTransportFilter.onCommand(StompTransportFilter.java:70)
	at org.apache.activemq.transport.TransportSupport.doConsume(TransportSupport.java:84)
	at org.apache.activemq.transport.tcp.SslTransport.doConsume(SslTransport.java:104)
	at org.apache.activemq.transport.tcp.TcpTransport.doRun(TcpTransport.java:196)
	at org.apache.activemq.transport.tcp.TcpTransport.run(TcpTransport.java:183)
	at java.lang.Thread.run(Thread.java:619)
"BrokerService":
	at org.apache.activemq.transport.stomp.StompTransportFilter.sendToActiveMQ(StompTransportFilter.java:80)
	- waiting to lock <0x9b8527b0> (a java.lang.Object)
	at org.apache.activemq.transport.stomp.StompSubscription.onMessageDispatch(StompSubscription.java:71)
	at org.apache.activemq.transport.stomp.ProtocolConverter.onActiveMQCommad(ProtocolConverter.java:550)
	at org.apache.activemq.transport.stomp.StompTransportFilter.oneway(StompTransportFilter.java:59)
	at org.apache.activemq.transport.InactivityMonitor.oneway(InactivityMonitor.java:233)
	- locked <0x9b857d50> (a java.util.concurrent.atomic.AtomicBoolean)
	at org.apache.activemq.transport.MutexTransport.oneway(MutexTransport.java:40)
	- locked <0x9b8362b0> (a java.lang.Object)
	at org.apache.activemq.broker.TransportConnection.dispatch(TransportConnection.java:1188)
	at org.apache.activemq.broker.TransportConnection.processDispatch(TransportConnection.java:776)
	at org.apache.activemq.broker.TransportConnection.iterate(TransportConnection.java:813)
	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:885)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:907)
	at java.lang.Thread.run(Thread.java:619)

Found 1 deadlock.