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PI59372: DEADLOCK MAY OCCUR IN CSCOPE RECOVERYMANAGER

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APAR status

  • Closed as program error.

Error description

  • A deadlock may occur in the CScope RecoveryManager.  A
    javacore shows callstacks of the following form:
    
     "HAManager.thread.pool : 1"
       Waiting on:
       com/ibm/ws/cscope/EventSemaphore@0x0000000103688678
       Owned by: <unowned>
       at java/lang/Object.wait(Native Method)
       at java/lang/Object.wait(Object.java:167(Compiled Code))
       at com/ibm/ws/cscope/EventSemaphore.waitEvent
          (EventSemaphore.java:62)
          (entered lock: com/ibm/ws/cscope/
           EventSemaphore@0x0000000103688678, entry count: 1)
       at
    com/ibm/ws/cscope/RecoveryManager.waitForRecoveryCompletion
          (RecoveryManager.java:1565)
       at com/ibm/ws/cscope/RecoveryManager.prepareToShutdown
          (RecoveryManager.java:1550)
       at
    com/ibm/ws/cscope/CScopeFailureScopeLifeCycleHelper.shutdown
          (CScopeFailureScopeLifeCycleHelper.java:298)
       at com/ibm/ws/cscope/RecoveryManager.terminateRecovery
          (RecoveryManager.java:1461)
          (entered lock: java/lang/Object
            @0x00000000996F14B8, entry count: 1)
       at com/ibm/ws/cscope/CScopeRecoveryAgent.terminateRecovery
          (CScopeRecoveryAgent.java:198)
       at
    com/ibm/ws/recoverylog/spi/RecoveryDirectorImpl.directTerminatio
    n
          (RecoveryDirectorImpl.java:823)
       at
    com/ibm/ws/recoverylog/spi/RLSHAGroupCallback.memberDeactivate
          (RLSHAGroupCallback.java:367)
       at com/ibm/ws/hamanager/impl/HAGroupImpl.doDeactivateMember
          (HAGroupImpl.java:761)
       at com/ibm/ws/hamanager/impl/HAGroupImpl$
          HAGroupUserCallback.doCallback(HAGroupImpl.java:1379)
       at com/ibm/ws/hamanager/impl/Worker.run(Worker.java:64
          (Compiled Code))
       at
    com/ibm/ws/util/ThreadPool$Worker.run(ThreadPool.java:1892)
    
     "Thread-2270"
       Blocked on: java/lang/Object@0x00000000996F14B8
       Owned by: "HAManager.thread.pool : 1"
       at com/ibm/ws/cscope/RecoveryManager.processRecoveredData
          (RecoveryManager.java:1027)
          (entered lock: com/ibm/ws/cscope/RecoveryManager
            @0x00000001036871F0, entry count: 1)
       at
    com/ibm/ws/cscope/RecoveryManager.run(RecoveryManager.java:649)
    

Local fix

  • N.\/A
    

Problem summary

  • ****************************************************************
    * USERS AFFECTED:  WebSphere Application Server users of       *
    *                  Business Activities (CScopes).              *
    ****************************************************************
    * PROBLEM DESCRIPTION: WSVR0605W message occurs indicating     *
    *                      a thread may be hung in the             *
    *                      com.ibm.ws.cscope.RecoveryManager       *
    *                      class                                   *
    ****************************************************************
    * RECOMMENDATION:                                              *
    ****************************************************************
    Synchronization in the CScope RecoveryManager class is
    performed both using an intrinsic lock on the RecoveryManager
    instance and a wait/notifyAll pattern on another internal
    object. The thread holding the intrinsic lock waited for the
    notify.  The thread that would post the notify was blocked
    trying to obtain the intrinsic lock.
    

Problem conclusion

  • The synchronization within the CScope RecoveryManager was
    modified so that the condition can no longer occur.
    
    The fix for this APAR is currently targeted for inclusion in
    fix packs 8.5.5.13 and 9.0.0.5.  Please refer to the
    Recommended Updates page for delivery information:
    http://www.ibm.com/support/docview.wss?rs=180&uid=swg27004980
    

Temporary fix

Comments

APAR Information

  • APAR number

    PI59372

  • Reported component name

    WEBS APP SERV N

  • Reported component ID

    5724H8800

  • Reported release

    850

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2016-03-17

  • Closed date

    2017-07-21

  • Last modified date

    2017-07-28

  • 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

    WEBS APP SERV N

  • Fixed component ID

    5724H8800

Applicable component levels

  • R850 PSY

       UP

  • R900 PSY

       UP

[{"Business Unit":{"code":"BU053","label":"Cloud \u0026 Data Platform"},"Product":{"code":"SSEQTP","label":"WebSphere Application Server"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"850","Line of Business":{"code":"LOB36","label":"IBM Automation"}}]

Document Information

Modified date:
16 October 2021