Sporadically, on shut down, IBM MQ and JBoss will deadlock. This does not occur on EAP 6.

The Deadlocking threads are
[1]
~~~
ServerService Thread Pool – 63" #183 prio=5 os_prio=0 tid=0x00000000021ef800 nid=0x50e2 waiting for monitor entry [0x00007fef8451a000]
java.lang.Thread.State: BLOCKED (on object monitor)
at com.ibm.mq.connector.outbound.ConnectionEventHandler.removeListener(ConnectionEventHandler.java:93)

• waiting to lock <0x000000009be01318> (a com.ibm.mq.connector.outbound.ConnectionEventHandler)
  at com.ibm.mq.connector.outbound.ManagedConnectionImpl.removeConnectionEventListener(ManagedConnectionImpl.java:434)
  at org.jboss.jca.core.connectionmanager.pool.mcp.SemaphoreConcurrentLinkedDequeManagedConnectionPool.doDestroy(SemaphoreConcurrentLinkedDequeManagedConnectionPool.java:1376)
  at org.jboss.jca.core.connectionmanager.pool.mcp.SemaphoreConcurrentLinkedDequeManagedConnectionPool.flush(SemaphoreConcurrentLinkedDequeManagedConnectionPool.java:882)
  at org.jboss.jca.core.connectionmanager.pool.mcp.SemaphoreConcurrentLinkedDequeManagedConnectionPool.shutdown(SemaphoreConcurrentLinkedDequeManagedConnectionPool.java:1065)
  at org.jboss.jca.core.connectionmanager.pool.AbstractPool.shutdown(AbstractPool.java:930)
• locked < 0x000000008d09b340> (a org.jboss.jca.core.connectionmanager.pool.strategy.OnePool)
  at org.jboss.jca.core.connectionmanager.AbstractConnectionManager.shutdown(AbstractConnectionManager.java:285)
• locked < 0x000000008d09b2e0> (a org.jboss.jca.core.connectionmanager.notx.NoTxConnectionManagerImpl)
  at org.jboss.as.connector.services.resourceadapters.deployment.AbstractResourceAdapterDeploymentService.unregisterAll(AbstractResourceAdapterDeploymentService.java:192)
  at org.jboss.as.connector.services.resourceadapters.deployment.AbstractResourceAdapterDeploymentService$3.run(AbstractResourceAdapterDeploymentService.java:346)
  at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
  at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
  at java.lang.Thread.run(Thread.java:745)
  at org.jboss.threads.JBossThread.run(JBossThread.java:320)
  ~~~
  [2]
  ~~~
  "DefaultMessageListenerContainer-2" #162 prio=5 os_prio=0 tid=0x0000000001d7a800 nid=0x46bf waiting for monitor entry [0x00007fef70a7d000]
  java.lang.Thread.State: BLOCKED (on object monitor)
  at org.jboss.jca.core.connectionmanager.AbstractConnectionManager.shutdown(AbstractConnectionManager.java:281)
• waiting to lock <0x000000008d09b2e0> (a org.jboss.jca.core.connectionmanager.notx.NoTxConnectionManagerImpl)
  at org.jboss.jca.core.connectionmanager.AbstractConnectionManager.returnManagedConnection(AbstractConnectionManager.java:724)
  at org.jboss.jca.core.connectionmanager.listener.NoTxConnectionListener.connectionClosed(NoTxConnectionListener.java:93)
  at com.ibm.mq.connector.outbound.ConnectionEventHandler.fireEvent(ConnectionEventHandler.java:135)
• locked < 0x000000009be01318> (a com.ibm.mq.connector.outbound.ConnectionEventHandler)
  at com.ibm.mq.connector.outbound.ManagedConnectionImpl.fireConnectionClosed(ManagedConnectionImpl.java:784)
  at com.ibm.mq.connector.outbound.ConnectionWrapper.close(ConnectionWrapper.java:337)
  at org.springframework.jms.connection.ConnectionFactoryUtils.releaseConnection(ConnectionFactoryUtils.java:80)
  at org.springframework.jms.listener.AbstractPollingMessageListenerContainer.doReceiveAndExecute(AbstractPollingMessageListenerContainer.java:358)
  at org.springframework.jms.listener.AbstractPollingMessageListenerContainer.receiveAndExecute(AbstractPollingMessageListenerContainer.java:255)
  at org.springframework.jms.listener.DefaultMessageListenerContainer$AsyncMessageListenerInvoker.invokeListener(DefaultMessageListenerContainer.java:1166)
  at org.springframework.jms.listener.DefaultMessageListenerContainer$AsyncMessageListenerInvoker.executeOngoingLoop(DefaultMessageListenerContainer.java:1158)
  at org.springframework.jms.listener.DefaultMessageListenerContainer$AsyncMessageListenerInvoker.run(DefaultMessageListenerContainer.java:1055)
  at java.lang.Thread.run(Thread.java:745)