JBoss shutdown hangs on IBM MQ ServerSessionImpl

Issue

• We see our JBoss shutdown hang on IBM MQs com.ibm.mq.connector.inbound.ServerSessionImpl.close like so:

"MSC service thread 1-27" prio=10 tid=0x00007fbeec088000 nid=0xee74 in Object.wait() [0x00007fbf3d988000]
   java.lang.Thread.State: WAITING (on object monitor)
    at java.lang.Object.wait(Native Method)
    - waiting on <0x00000007667b79a0> (a com.ibm.mq.connector.inbound.ServerSessionImpl$IsInUseLock)
    at java.lang.Object.wait(Object.java:503)
    at com.ibm.mq.connector.inbound.ServerSessionImpl.close(ServerSessionImpl.java:290)
    - locked <0x00000007667b79a0> (a com.ibm.mq.connector.inbound.ServerSessionImpl$IsInUseLock)
    at com.ibm.mq.connector.inbound.ServerSessionPoolImpl.closeInternal(ServerSessionPoolImpl.java:645)
    at com.ibm.mq.connector.inbound.ServerSessionPoolImpl.close(ServerSessionPoolImpl.java:583)
    at com.ibm.mq.connector.inbound.MessageEndpointDeployment.stopDeliveryASF(MessageEndpointDeployment.java:583)
    at com.ibm.mq.connector.inbound.MessageEndpointDeployment.stop(MessageEndpointDeployment.java:482)
    at com.ibm.mq.connector.ResourceAdapterImpl.endpointDeactivation(ResourceAdapterImpl.java:476)
    - locked <0x0000000790acc5b0> (a java.util.HashMap)
    at org.jboss.jca.core.rar.EndpointImpl.deactivate(EndpointImpl.java:235)
    at org.jboss.as.ejb3.component.messagedriven.MessageDrivenComponent.deactivate(MessageDrivenComponent.java:216)
    at org.jboss.as.ejb3.component.messagedriven.MessageDrivenComponent.stopDelivery(MessageDrivenComponent.java:230)