Ron Koerner created AMQ-3873:
--------------------------------
Summary: 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
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:
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.
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