Keith Wall created QPID-5050: -------------------------------- Summary: Clients calling Connection#stop() from within an ExceptionListener have potential for deadlock Key: QPID-5050 URL: https://issues.apache.org/jira/browse/QPID-5050 Project: Qpid Issue Type: Bug Components: Java Client Affects Versions: 0.22, 0.20, 0.18, 0.16, 0.14, 0.12, 0.10, 0.8 Reporter: Keith Wall
A deadlock possibility exists for client applications calling Connection#stop within an application owned ExceptionListener. Unfortunately a common messaging framework (Spring), installs such a ExceptionListener. In a recent support call, such a deadlock had occurred between the dispatcher thread (whose onMessage was in the process of creating a session) and a pooled thread bouncing a message back to the application. (The bounced messages is returned to the application via the exception listener). The deadlock involves the Dispatcher._lock and AMQConnection._failoverMutex. The deadlock was reproduced with a system test (attached to Jira) and deadlock captured with jstack -l <pid> (output below). {noformat} Dispatcher-1-Conn-4 pool-8-thread-1 + acquires c888 (Dispatcher#_lock) + acquires ca68 (AMQConnection#_failoverMutex) + tries to acquire ca68 + tries to acquire c888 {noformat} {noformat} Found one Java-level deadlock: ============================= "pool-8-thread-1": waiting to lock monitor 0x000000005b0d3560 (object 0x00000000f70bc888, a java.lang.Object), which is held by "Dispatcher-1-Conn-4" "Dispatcher-1-Conn-4": waiting to lock monitor 0x000000005b187308 (object 0x00000000f70bca68, a java.lang.Object), which is held by "pool-8-thread-1" Java stack information for the threads listed above: =================================================== "pool-8-thread-1": at org.apache.qpid.client.AMQSession$Dispatcher.setConnectionStopped(AMQSession.java:3276) - waiting to lock <0x00000000f70bc888> (a java.lang.Object) at org.apache.qpid.client.AMQSession.stop(AMQSession.java:2382) at org.apache.qpid.client.AMQConnection.stop(AMQConnection.java:835) at org.apache.qpid.test.unit.client.connection.ExceptionListenerTest$4.onException(ExceptionListenerTest.java:206) at org.apache.qpid.client.AMQConnection.exceptionReceived(AMQConnection.java:1329) - locked <0x00000000f70bca68> (a java.lang.Object) at org.apache.qpid.client.AMQSession_0_8$4.run(AMQSession_0_8.java:600) at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908) at java.lang.Thread.run(Thread.java:662) "Dispatcher-1-Conn-4": at org.apache.qpid.client.AMQConnectionDelegate_8_0.executeRetrySupport(AMQConnectionDelegate_8_0.java:333) - waiting to lock <0x00000000f70bca68> (a java.lang.Object) at org.apache.qpid.client.AMQConnection.executeRetrySupport(AMQConnection.java:624) at org.apache.qpid.client.failover.FailoverRetrySupport.execute(FailoverRetrySupport.java:102) at org.apache.qpid.client.AMQSession.createProducerImpl(AMQSession.java:2600) at org.apache.qpid.client.AMQSession.createProducer(AMQSession.java:1176) at org.apache.qpid.client.AMQSession.createProducer(AMQSession.java:98) at org.apache.qpid.test.unit.client.connection.ExceptionListenerTest$5.onMessage(ExceptionListenerTest.java:229) at org.apache.qpid.client.BasicMessageConsumer.notifyMessage(BasicMessageConsumer.java:744) at org.apache.qpid.client.BasicMessageConsumer.notifyMessage(BasicMessageConsumer.java:718) at org.apache.qpid.client.AMQSession$Dispatcher.notifyConsumer(AMQSession.java:3388) at org.apache.qpid.client.AMQSession$Dispatcher.dispatchMessage(AMQSession.java:3327) - locked <0x00000000f71747e0> (a java.lang.Object) - locked <0x00000000f70bc888> (a java.lang.Object) at org.apache.qpid.client.AMQSession$Dispatcher.access$900(AMQSession.java:3114) at org.apache.qpid.client.AMQSession.dispatch(AMQSession.java:3107) at org.apache.qpid.client.message.UnprocessedMessage.dispatch(UnprocessedMessage.java:54) at org.apache.qpid.client.AMQSession$Dispatcher.run(AMQSession.java:3250) at java.lang.Thread.run(Thread.java:662) Found 1 deadlock. {noformat} -- 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