JBoss shutdown stalls on XARecoveryModule.waitForScanState

Issue

• We see JBoss shutdown operations hanging in XARecoveryModule.waitForScanState like so:

"ServerService Thread Pool -- 15" prio=10 tid=0x00007fbc84096000 nid=0x3ee in Object.wait() [0x00007fbde4372000]
   java.lang.Thread.State: WAITING (on object monitor)
    at java.lang.Object.wait(Native Method)
    at java.lang.Object.wait(Object.java:503)
    at com.arjuna.ats.internal.jta.recovery.arjunacore.XARecoveryModule.waitForScanState(XARecoveryModule.java:935)
    at com.arjuna.ats.internal.jta.recovery.arjunacore.XARecoveryModule.removeXAResourceRecoveryHelper(XARecoveryModule.java:92)
    - locked <0x000000078cbc3b28> (a java.util.concurrent.atomic.AtomicInteger)
    at com.arjuna.ats.jbossatx.jta.RecoveryManagerService.removeXAResourceRecovery(RecoveryManagerService.java:117)
    at org.hornetq.jms.server.recovery.HornetQRegistryBase.stop(HornetQRegistryBase.java:59)
    at org.hornetq.ra.recovery.RecoveryManager.stop(RecoveryManager.java:90)
    at org.hornetq.ra.HornetQResourceAdapter.stop(HornetQResourceAdapter.java:298)
    at org.jboss.as.connector.services.resourceadapters.deployment.AbstractResourceAdapterDeploymentService.unregisterAll(AbstractResourceAdapterDeploymentService.java:188)
    at org.jboss.as.connector.services.resourceadapters.ResourceAdapterActivatorService.unregisterAll(ResourceAdapterActivatorService.java:129)
    at org.jboss.as.connector.services.resourceadapters.deployment.AbstractResourceAdapterDeploymentService$2.run(AbstractResourceAdapterDeploymentService.java:299)
    - locked <0x0000000770f5ce88> (a org.jboss.as.connector.services.resourceadapters.deployment.AbstractResourceAdapterDeploymentService$2)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
    at java.lang.Thread.run(Thread.java:745)
    at org.jboss.threads.JBossThread.run(JBossThread.java:122)