[jboss-jira] [JBoss JIRA] (AS7-5858) JBOSS 7.1.1.Final hangs on z/OS with new JDK maintenance

[Stuart Douglas (JIRA)]

     [ https://issues.jboss.org/browse/AS7-5858?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Stuart Douglas updated AS7-5858:
--------------------------------

    Attachment: xnio-nio-3.0.8.GA-SNAPSHOT.jar


I may have a possible workaround at:

https://github.com/stuartwdouglas/xnio/tree/AS7-5858

I have attached an XNIO jar built with this version, would you be able to try it out and see if it fixes your problem? Just copy it over the existing xnio-nio jar in the modules directory.
                
> JBOSS 7.1.1.Final hangs on z/OS with new JDK maintenance
> --------------------------------------------------------
>
>                 Key: AS7-5858
>                 URL: https://issues.jboss.org/browse/AS7-5858
>             Project: Application Server 7
>          Issue Type: Bug
>          Components: Server
>    Affects Versions: 7.1.1.Final
>         Environment: operating system - z/OS version 1.13
> JDK version info:
> java version "1.7.0"
> Java(TM) SE Runtime Environment (build pmz6470sr2-20120901_01(SR2))
> IBM J9 VM (build 2.6, JRE 1.7.0 z/OS s390x-64 20120809_118929 (JIT enabled, AOT enabled)
> J9VM - R26_Java726_SR2_20120809_0948_B118929
> JIT  - r11.b01_20120808_24925
> GC   - R26_Java726_SR2_20120809_0948_B118929
> J9CL - 20120809_118929)
> JCL - 20120831_02 based on Oracle 7u3-b05
>            Reporter: Bob Bennett
>            Assignee: Jason Greene
>              Labels: jboss
>         Attachments: relevant-threads.txt, threadstacks.txt, xnio-nio-3.0.8.GA-SNAPSHOT.jar
>
>
> When I install the jboss-as-7.1.1.Final on a z/OS system with the newest JDK, and start the standalone server, it gets stuck and never completes initialization.  It also does not respond to kill, and requires kill -9 to terminate.  I have javacore from the hang.  I opened an issue with IBM support, and here is their response:
> Hi Bob,                                                                 
>                                                                         
> Have you contacted JBoss support for this issue?                        
>                                                                         
> From my review of the javacore, every application-related thread is     
> waiting on some kind of internal state monitoring code. The most        
> prominent cause of waiting appears to be a CountdownLatch used in:      
>                                                                         
> org/jboss/as/controller/ParallelBootOperationStepHandler                
>           $ParallelBootTransactionControl.operationPrepared             
>                                                                         
> A quick search found this possibly related JBoss bug which was          
> introduced because of incompatibilities with Java 7 (although it would appear to have been fixed before your current build, but I'm not certain
> how.) https://issues.jboss.org/browse/AS7-2940?_sscc=t                  
>                                                                         
> The CountdownLatch is one of the Concurrency classes, and is very       
> simplistic in that it allows an application to direct threads to wait   
> until some certain number of actions have occured. The application code 
> (JBoss in this case) would need to explain how many countdowns are      
> required and which piece of code decrements the counter as needed.      
>                                                                         
> There's not much to say from a JVM perspective other than the threads   
> are all waiting for an application-level event (a call to the           
> "countDown()" method 'N' times where 'N' is how many JBoss initialized  
> the CountDownLatch to originally.)                                      
>                                                                         
> If the JBoss team believes there is a specific thread not processing for one reason or another, we could look at that from a JVM perspective to see why. Unfortunately we'd need the JBoss team to explain which thread 
> they think should be executing and why. A system dump of the problem    
> (taken using signal 3, or from the operator console) would potentially allow for the internal state variables associated here to be read out...
> but that won't really be of any use if we don't know what JBoss expects 
> them to be.                                                             
>                                                                         
> Regards,                                                                                                                         
> Java Defect Support                                                     
> Please let me know if you need more info, either from myself or IBM JDK support.

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