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From "Rajith Attapattu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (QPID-4574) [JMS] Deadlock involving _failoverMutex and _messageDeliveryLock
Date Fri, 08 Feb 2013 16:43:12 GMT

    [ https://issues.apache.org/jira/browse/QPID-4574?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13574608#comment-13574608
] 

Rajith Attapattu commented on QPID-4574:
----------------------------------------

The issue here is that the locks are acquired in the wrong order.
A solution to this is to acquire the failoverMutex in the dispatchMessage method in Dispatcher
before it acquires the messageDeliveryLock.
This allows any method (that requires the failoverMutex) called from within the onMessage
method to acquire the locks in the correct order.

Since the close method acquires the messageDeliveryLock after getting the failoverMutex, the
deadlocks is avoided.
This allows the close method to wait until an inprogress message dispatching operation to
proceed before it continues with the close operation.

I have tested this fix with the attached reproducers and it passes our test suite as well.
                
> [JMS] Deadlock involving _failoverMutex and _messageDeliveryLock
> ----------------------------------------------------------------
>
>                 Key: QPID-4574
>                 URL: https://issues.apache.org/jira/browse/QPID-4574
>             Project: Qpid
>          Issue Type: Bug
>          Components: Java Client
>    Affects Versions: 0.14, 0.16, 0.18, 0.20
>            Reporter: Rajith Attapattu
>            Assignee: Rajith Attapattu
>             Fix For: 0.21
>
>
> This deadlock can manifest when a you have a producer sending messages inside an onMessage()
call.
> This is a common enough pattern, and is used by intermediaries like Message Bridges,
ESB's etc..
> "Dispatcher-0-Conn-1":
> 	at org.apache.qpid.client.BasicMessageProducer.send(BasicMessageProducer.java:309)
> 	- waiting to lock <0x00000000ecfd15a8> (a java.lang.Object)
> 	at Test_00782235$1.onMessage(Test_00782235.java:29)
> 	at org.apache.qpid.client.BasicMessageConsumer.notifyMessage(BasicMessageConsumer.java:751)
> 	at org.apache.qpid.client.BasicMessageConsumer_0_10.notifyMessage(BasicMessageConsumer_0_10.java:141)
> 	at org.apache.qpid.client.BasicMessageConsumer.notifyMessage(BasicMessageConsumer.java:725)
> 	at org.apache.qpid.client.BasicMessageConsumer_0_10.notifyMessage(BasicMessageConsumer_0_10.java:186)
> 	at org.apache.qpid.client.BasicMessageConsumer_0_10.notifyMessage(BasicMessageConsumer_0_10.java:54)
> 	at org.apache.qpid.client.AMQSession$Dispatcher.notifyConsumer(AMQSession.java:3479)
> 	at org.apache.qpid.client.AMQSession$Dispatcher.dispatchMessage(AMQSession.java:3418)
> 	- locked <0x00000000ecfd16c8> (a java.lang.Object)
> 	- locked <0x00000000ecfd16d8> (a java.lang.Object)
> 	at org.apache.qpid.client.AMQSession$Dispatcher.access$1000(AMQSession.java:3205)
> 	at org.apache.qpid.client.AMQSession.dispatch(AMQSession.java:3198)
> 	at org.apache.qpid.client.message.UnprocessedMessage.dispatch(UnprocessedMessage.java:54)
> 	at org.apache.qpid.client.AMQSession$Dispatcher.run(AMQSession.java:3341)
> 	at java.lang.Thread.run(Thread.java:679)
> "main":
> 	at org.apache.qpid.client.BasicMessageConsumer.close(BasicMessageConsumer.java:598)
> 	- waiting to lock <0x00000000ecfd16c8> (a java.lang.Object)
> 	- locked <0x00000000ecfd15a8> (a java.lang.Object)
> 	at org.apache.qpid.client.BasicMessageConsumer.close(BasicMessageConsumer.java:558)
> 	at Test_00782235.<init>(Test_00782235.java:62)
> 	at Test_00782235.main(Test_00782235.java:12)

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