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PM35239: DEADLOCK IN COM/IBM/WS/ASYNCHBEANS/SERVICES/WLM/ENCLAVEMANAGER

A fix is available

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APAR status

  • Closed as program error.

Error description

  • When running Websphere Application Server zOS, the
    com/ibm/ws/asynchbeans/services/wlm/EnclaveManager goes into a
    deadlock with two threads causing the server to hang and
    eventually timeout with an EC3/04130007.
    
    The external symptoms would be a server hang/timeout with the
    below.
    BBOO0327I HTTP REQUEST TIMEOUT:
    (0301):(FCCD51ED):(0001001D):(009B6088):(STC64556):
    (2011/01/29 21:45:01.811575):(2011/01/29 21:45:02.046377):
    (2011/01/29 21:45:02.054852):(RemoteWebContainer):(httprequest):
    (ipaddr=a.b.b.d port=xxxx):():():(/aaaaa/bbbbb)
    
    When extracted the javacore from the EC3 dump we found the below
    deadlock contention.
    1LKDEADLOCK    Deadlock detected !!!
    NULL           ---------------------
    NULL
    2LKDEADLOCKTHR  Thread
    "java.lang.ThreadGroup[name=DefaultWorkManager:
    CWS_LOGON_EAR,maxpri=10]" (0x4EFFCC00)
    3LKDEADLOCKWTR    is waiting for:
    4LKDEADLOCKMON      sys_mon_t:0x5113A2AC infl_mon_t: 0x5113A2EC:
    4LKDEADLOCKOBJ      java/util/HashMap@36548D18/36548D24:
    3LKDEADLOCKOWN    which is owned by:
    2LKDEADLOCKTHR  Thread "WebSphere:ORB.thread.pool t=009be9d8"
    (0x527A0500)
    3LKDEADLOCKWTR    which is waiting for:
    4LKDEADLOCKMON      sys_mon_t:0x5113A7FC infl_mon_t: 0x5113A83C:
    4LKDEADLOCKOBJ
    com/ibm/ws/asynchbeans/services/wlm/Enclave@2EAE7F80/2EAE7F8C:
    3LKDEADLOCKOWN    which is owned by:
    2LKDEADLOCKTHR  Thread
    "java.lang.ThreadGroup[name=DefaultWorkManager:
    CWS_LOGON_EAR,maxpri=10]" (0x4EFFCC00)
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED:  All users of IBM WebSphere Application Server
    *                  V7.0                                        *
    ****************************************************************
    * PROBLEM DESCRIPTION: At times a deadlock is reported when    *
    *                      using Classifiction Service in          *
    *                      AsynchBeans.                            *
    ****************************************************************
    * RECOMMENDATION:                                              *
    ****************************************************************
    There is a circular reference in the EnclaveManager code of
    Classification Service that could lead to deadlock, when two
    threads simultaneously work on the single object of this class.
    

Problem conclusion

  • The problem is fixed by avoiding circular reference.
    
    APAR PM35239 is currently targeted for inclusion in Service
    Level (Fix Pack) 7.0.0.19 of WebSphere Application Server V7.0.
    
    Please refer to URL:
    //www.ibm.com/support/docview.wss?rs=404&uid=swg27006970
    for Fix Pack availability.
    

Temporary fix

Comments

APAR Information

  • APAR number

    PM35239

  • Reported component name

    WEBSPHERE FOR Z

  • Reported component ID

    5655I3500

  • Reported release

    700

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2011-03-21

  • Closed date

    2011-05-10

  • Last modified date

    2011-10-04

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

    PM32618

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

Fix information

  • Fixed component name

    WEBSPHERE FOR Z

  • Fixed component ID

    5655I3500

Applicable component levels

  • R700 PSY UK71280

       UP11/09/10 P F109

Fix is available

  • Select the PTF appropriate for your component level. You will be required to sign in. Distribution on physical media is not available in all countries.

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Document Information

Modified date:
10 February 2022