I have run the java systests with the JCarder 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:
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.