Philip Harvey created QPID-5118:
-----------------------------------
Summary: [JMS] Deadlock when closing a consumer and calling JMS
operatons inside onMessage() on AMQP 0-8/0-9/0-9-1 connection
Key: QPID-5118
URL: https://issues.apache.org/jira/browse/QPID-5118
Project: Qpid
Issue Type: Bug
Components: Java Client
Affects Versions: 0.22
Reporter: Philip Harvey
I have run the java systests with the [JCarder|http://jcarder.org/] agent
attached. When using AMQP 0-9, JCarder detected a potential deadlock when the
following are done concurrently:
* Close a consumer from an application thread.
* Call one of the JMS operations inside MessageListener.onMessage() that uses
AMQConnectionDelegate_8_0.executeRetrySupport(..).
Here is a sketch of the deadlock scenario:
{noformat}
Thread: Dispatcher-1-Conn-600
AMQSession$Dispatcher.dispatchMessage()
lock AMQSession.this._messageDeliveryLock
...
myMessageListener.onMessage()
execute failover-aware operation eg
createQueue, createProducer etc
AMQConnectionDelegate_8_0.executeRetrySupport
lock
AMQConnection.getFailoverMutex()
Thread: main
BasicMessageConsumer.close()
lock AMQSession.getFailoverMutex()
lock AMQSession._messageDeliveryLock
{noformat}
Interestingly, AMQConnectionDelegate_0_10.executeRetrySupport(..) does not
acquire the failover mutex (I have no idea if it _should_) so is not
susceptible to this deadlock.
I've attached the GraphViz .dot file that JCarder generated when it detected
this problem.
Note that this problem is similar to QPID-4574 so might be fixed by a single
commit.
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