IBM Support

PM95819: The XIOPrimary thread hangs while waiting to place work on another thread pool.

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APAR status

  • Closed as program error.

Error description

  • When the ContainerWork thread pool is consumed, threads that
    attempt to put work on that thread pool will wait until the
    ContainerWork thread pool has an available thread. See the
    following example of messages that indicate thread hangs:
    
    [8/8/13 17:56:12:893 EDT] 00000065 XSThreadPool  W   CWOBJ7853W:
    Detected a hung thread named "XIOPrimaryPool : 201" TID:17fa
    TIMED_WAITING.  Executing since 8/8/2013 17:55:44:294 -0400.
    Stack Trace:
     java.lang.Object.wait(Native Method)
     java.lang.Object.wait(Object.java:196)
     com.ibm.ws.util.BoundedBuffer.waitPut_(BoundedBuffer.java:214)
     com.ibm.ws.util.BoundedBuffer.put(BoundedBuffer.java:324)
     com.ibm.ws.util.ThreadPool.execute(ThreadPool.java:1305)
     com.ibm.ws.util.ThreadPool.execute(ThreadPool.java:1082)
    
    com.ibm.ws.objectgrid.thread.ThreadPoolMgrImpl$SecurityContextTh
    readPool.execute(ThreadPoolMgrImpl.java:181)
    
    com.ibm.ws.objectgrid.thread.ThreadPoolMgrImpl$SecurityContextTh
    readPool.execute(ThreadPoolMgrImpl.java:176)
    
    com.ibm.ws.objectgrid.server.container.ContainerActor.doWorkRece
    ive(ContainerActor.java:298)
    
    com.ibm.ws.objectgrid.server.container.ContainerActor.receive(Co
    ntainerActor.java:174)
    
    com.ibm.ws.xsspi.xio.actor.XIOReferable.dispatch(XIOReferable.ja
    va:114)
    
    com.ibm.ws.xsspi.xio.actor.XIORegistry.sendToTarget(XIORegistry.
    java:964)
    
    com.ibm.ws.xs.xio.transport.channel.XIORegistryRunnable.run(XIOR
    egistryRunnable.java:84)
    
    java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExec
    utor.java:1156)
    
    java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExe
    cutor.java:626)
    
    com.ibm.ws.objectgrid.thread.XSThreadPool$Worker.run(XSThreadPoo
    l.java:309)
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED:  All users of eXtreme Scale.                 *
    ****************************************************************
    * PROBLEM DESCRIPTION: When placement events take longer,      *
    *                      the transport thread pool can get       *
    *                      backed up due to thread pool            *
    *                      implementation.                         *
    ****************************************************************
    * RECOMMENDATION:                                              *
    ****************************************************************
    The ContainerWork thread pool implementation was updated to
    queue waiting work instead of blocking work until a thread is
    available to process it.
    

Problem conclusion

  • An interim fix is available for this APAR.
    

Temporary fix

Comments

APAR Information

  • APAR number

    PM95819

  • Reported component name

    WS EXTREME SCAL

  • Reported component ID

    5724X6702

  • Reported release

    860

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2013-08-26

  • Closed date

    2013-08-29

  • Last modified date

    2013-08-29

  • APAR is sysrouted FROM one or more of the following:

  • APAR is sysrouted TO one or more of the following:

Fix information

  • Fixed component name

    WS EXTREME SCAL

  • Fixed component ID

    5724X6702

Applicable component levels

  • R860 PSY

       UP

[{"Business Unit":{"code":"BU053","label":"Cloud & Data Platform"},"Product":{"code":"SSTVLU","label":"WebSphere eXtreme Scale"},"Component":"","ARM Category":[],"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"860","Edition":"","Line of Business":{"code":"LOB45","label":"Automation"}}]

Document Information

Modified date:
29 August 2013