Philip Harvey created QPID-5119: ----------------------------------- Summary: Java client - 3-thread deadlock on pre-AMQP-0-10 connection involving messageDeliveryLock, failover mutex and sessionCreationLock Key: QPID-5119 URL: https://issues.apache.org/jira/browse/QPID-5119 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 Connection.createSession from an application thread. * Call Connection.createSession inside MessageListener.onMessage(). Here is a sketch of the deadlock scenario: {noformat} "Dispatcher-1-Conn-780" AMQSession$Dispatcher.dispatchMessage() lock AMQSession.this._messageDeliveryLock AMQConnection.createSession() lock AMQConnection._sessionCreationLock BLOCKED BY applicationThread1 "applicationThread1" AMQConnection.createSession lock AMQConnection._sessionCreationLock ... AMQConnectionDelegate_8_0.executeRetrySupport lock AMQConnection.getFailoverMutex() BLOCKED BY applicationThread2 "applicationThread2" BasicMessageConsumer.close() lock AMQSession.getFailoverMutex() lock AMQSession._messageDeliveryLock BLOCKED BY Dispatcher-1-Conn-780 {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 and QPID-5118 so might be fixed by a single commit. -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators For more information on JIRA, see: http://www.atlassian.com/software/jira --------------------------------------------------------------------- To unsubscribe, e-mail: dev-unsubscr...@qpid.apache.org For additional commands, e-mail: dev-h...@qpid.apache.org