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From drvillo <f.viv...@gmail.com>
Subject Another deadlock showing up
Date Sat, 23 Dec 2006 10:44:56 GMT

Hi all

This one happens systematically after a while I run my service (not during
an isolated test).
I have still to figure out if I can reproduce it with a stub.
Anyway it always appear to be the same.

The only thing that I find relevant in the logs is that at some point the
broker seems to be unreachable a moment,
but after that clients reconnect and everything goes on normally.
I have attached an excerpt of the log to make things clearer.
http://www.nabble.com/file/5096/deadlock.log deadlock.log 

I'm using an embedded broker, over tcp and connecting through 
tcp://localhost:61617?jms.dispatchAsync=true&amp;jms.dispatchAsync=true


with ActiveMQ-4.2-incubator-SNAPSHOT.
I'm pretty sure this wasn't happening with 4.0.1

I hope someone can help me on this, right now I'm pretty much stuck.

Thanks everybody, and merry christmas!
Francesco


Found one Java-level deadlock:
=============================
"ActiveMQ Task":
  waiting to lock monitor 0x080e4f3c (object 0x92b60db0, a
java.util.LinkedList),
  which is held by "ActiveMQ Transport: tcp:///127.0.0.1:37496"
"ActiveMQ Transport: tcp:///127.0.0.1:37496":
  waiting to lock monitor 0x080e4f7c (object 0x92b60d98, a
org.apache.activemq.broker.region.cursors.VMPendingMessageCursor),
  which is held by "ActiveMQ Task"

Java stack information for the threads listed above:
===================================================
"ActiveMQ Task":
        at
org.apache.activemq.broker.region.PrefetchSubscription.dispatch(PrefetchSubscription.java:414)
        - waiting to lock <0x92b60db0> (a java.util.LinkedList)
        at
org.apache.activemq.broker.region.QueueSubscription.dispatch(QueueSubscription.java:172)
        at
org.apache.activemq.broker.region.PrefetchSubscription.dispatchMatched(PrefetchSubscription.java:397)
        - locked <0x92b60d98> (a
org.apache.activemq.broker.region.cursors.VMPendingMessageCursor)
        at
org.apache.activemq.broker.region.PrefetchSubscription.onDispatch(PrefetchSubscription.java:451)
        at
org.apache.activemq.broker.region.QueueSubscription.onDispatch(QueueSubscription.java:192)
        at
org.apache.activemq.broker.region.PrefetchSubscription$3.run(PrefetchSubscription.java:429)
        at
org.apache.activemq.broker.TransportConnection.processDispatch(TransportConnection.java:778)
        at
org.apache.activemq.broker.TransportConnection.iterate(TransportConnection.java:791)
        at
org.apache.activemq.thread.PooledTaskRunner.runTask(PooledTaskRunner.java:111)
        at
org.apache.activemq.thread.PooledTaskRunner.access$100(PooledTaskRunner.java:26)
        at
org.apache.activemq.thread.PooledTaskRunner$1.run(PooledTaskRunner.java:44)
        at
java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:650)
        at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:675)
        at java.lang.Thread.run(Thread.java:595)
"ActiveMQ Transport: tcp:///127.0.0.1:37496":
        at
org.apache.activemq.broker.region.PrefetchSubscription.dispatchMatched(PrefetchSubscription.java:383)
        - waiting to lock <0x92b60d98> (a
org.apache.activemq.broker.region.cursors.VMPendingMessageCursor)
        at
org.apache.activemq.broker.region.PrefetchSubscription.acknowledge(PrefetchSubscription.java:219)
        - locked <0x92b60db0> (a java.util.LinkedList)
        at
org.apache.activemq.broker.region.AbstractRegion.acknowledge(AbstractRegion.java:299)
        at
org.apache.activemq.broker.region.RegionBroker.acknowledge(RegionBroker.java:397)
        at
org.apache.activemq.broker.TransactionBroker.acknowledge(TransactionBroker.java:177)
        at
org.apache.activemq.broker.BrokerFilter.acknowledge(BrokerFilter.java:74)
        at
org.apache.activemq.broker.BrokerFilter.acknowledge(BrokerFilter.java:74)
        at
org.apache.activemq.broker.MutableBrokerFilter.acknowledge(MutableBrokerFilter.java:88)
        at
org.apache.activemq.broker.TransportConnection.processMessageAck(TransportConnection.java:491)
        at org.apache.activemq.command.MessageAck.visit(MessageAck.java:179)
        at
org.apache.activemq.broker.TransportConnection.service(TransportConnection.java:287)
        at
org.apache.activemq.broker.TransportConnection$1.onCommand(TransportConnection.java:178)
        at
org.apache.activemq.transport.TransportFilter.onCommand(TransportFilter.java:65)
        at
org.apache.activemq.transport.WireFormatNegotiator.onCommand(WireFormatNegotiator.java:133)
        at
org.apache.activemq.transport.InactivityMonitor.onCommand(InactivityMonitor.java:122)
        at
org.apache.activemq.transport.TransportSupport.doConsume(TransportSupport.java:84)
        at
org.apache.activemq.transport.tcp.TcpTransport.run(TcpTransport.java:137)
        at java.lang.Thread.run(Thread.java:595)

Found 1 deadlock.




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