IBM Support

PM90822: WHEN A THREAD ENDS A CELL IN THE CPOOL WITH A HEADER OF "WEBSPHERE SR CTX CPOOL" IS LEAKED

Fixes are available

8.0.0.8: WebSphere Application Server V8.0 Fix Pack 8
7.0.0.31: WebSphere Application Server V7.0 Fix Pack 31
8.5.5.2: WebSphere Application Server V8.5.5 Fix Pack 2
7.0.0.33: WebSphere Application Server V7.0 Fix Pack 33
8.0.0.9: WebSphere Application Server V8.0 Fix Pack 9
Rational ClearCase Fix Pack 4 (8.0.1.4) for 8.0.1
8.5.5.3: WebSphere Application Server V8.5.5 Fix Pack 3
Rational ClearCase Fix Pack 5 (8.0.1.5) for 8.0.1
7.0.0.35: WebSphere Application Server V7.0 Fix Pack 35
8.5.5.4: WebSphere Application Server V8.5.5 Fix Pack 4
Rational ClearCase Fix Pack 6 (8.0.1.6) for 8.0.1
8.0.0.10: WebSphere Application Server V8.0 Fix Pack 10
7.0.0.37: WebSphere Application Server V7.0 Fix Pack 37
8.5.5.5: WebSphere Application Server V8.5.5 Fix Pack 5
Rational ClearCase Fix Pack 7 (8.0.1.7) for 8.0.1
Rational ClearCase Fix Pack 8 (8.0.1.8) for 8.0.1
8.5.5.6: WebSphere Application Server V8.5.5 Fix Pack 6
8.0.0.11: WebSphere Application Server V8.0 Fix Pack 11
8.5.5.7: WebSphere Application Server V8.5.5 Fix Pack 7
Rational ClearCase Fix Pack 9 (8.0.1.9) for 8.0.1
7.0.0.39: WebSphere Application Server V7.0 Fix Pack 39
8.5.5.8: WebSphere Application Server V8.5.5 Fix Pack 8
Rational ClearCase Fix Pack 10 (8.0.1.10) for 8.0.1
8.0.0.12: WebSphere Application Server V8.0 Fix Pack 12
8.5.5.9: WebSphere Application Server V8.5.5 Fix Pack 9
7.0.0.41: WebSphere Application Server V7.0 Fix Pack 41
Rational ClearCase Fix Pack 11 (8.0.1.11) for 8.0.1
8.5.5.10: WebSphere Application Server V8.5.5 Fix Pack 10
Rational ClearCase Fix Pack 12 (8.0.1.12) for 8.0.1
Rational ClearCase Fix Pack 13 (8.0.1.13) for 8.0.1
8.5.5.11: WebSphere Application Server V8.5.5 Fix Pack 11
8.0.0.13: WebSphere Application Server V8.0 Fix Pack 13
Rational ClearCase Fix Pack 14 (8.0.1.14) for 8.0.1
7.0.0.43: WebSphere Application Server V7.0 Fix Pack 43
8.5.5.12: WebSphere Application Server V8.5.5 Fix Pack 12
Rational ClearCase Fix Pack 15 (8.0.1.15) for 8.0.1
8.0.0.14: WebSphere Application Server V8.0 Fix Pack 14
Rational ClearCase Fix Pack 16 (8.0.1.16) for 8.0.1
8.5.5.13: WebSphere Application Server V8.5.5 Fix Pack 13
Rational ClearCase Fix Pack 17 (8.0.1.17) for 8.0.1
7.0.0.45: WebSphere Application Server V7.0 Fix Pack 45
8.0.0.15: WebSphere Application Server V8.0 Fix Pack 15
7.0.0.45: Java SDK 1.6 SR16 FP60 Cumulative Fix for WebSphere Application Server
7.0.0.31: Java SDK 1.6 SR15 Cumulative Fix for WebSphere Application Server
7.0.0.35: Java SDK 1.6 SR16 FP1 Cumulative Fix for WebSphere Application Server
7.0.0.37: Java SDK 1.6 SR16 FP3 Cumulative Fix for WebSphere Application Server
7.0.0.39: Java SDK 1.6 SR16 FP7 Cumulative Fix for WebSphere Application Server
7.0.0.41: Java SDK 1.6 SR16 FP20 Cumulative Fix for WebSphere Application Server
7.0.0.43: Java SDK 1.6 SR16 FP41 Cumulative Fix for WebSphere Application Server
8.5.5.14: WebSphere Application Server V8.5.5 Fix Pack 14
Rational ClearCase Fix Pack 18 (8.0.1.18) for 8.0.1
Rational ClearCase Fix Pack 19 (8.0.1.19) for 8.0.1
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APAR status

  • Closed as program error.

Error description

  • When a thread ends, a cell in the cpool with a header of
    "WebSphere SR Ctx Cpool" is leaked.  The cells come from
    common storage subpool 241.  This is especially noticable if
    a large number of threads are created and destroyed during an
    appservers lifespan.
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED:  All users of IBM WebSphere Application      *
    *                  Server V7.0, V8.0 and V8.5                  *
    ****************************************************************
    * PROBLEM DESCRIPTION: WebSphere Application Server for z/OS   *
    *                      using a high amount of subpool 241      *
    *                      (common storage).                       *
    ****************************************************************
    * RECOMMENDATION:                                              *
    ****************************************************************
    Queue elements used to keep track of all contexts used by the
    server come from a common area cell pool. A terminating thread
    with a context will not remove the context from the queue.
    Servers with applications that create a thread
    that runs for awhile, performs an operation that requires
    a context and then ends cause a cpool element to be leaked.
    The severity of the leak is determined by the number of threads
    that are starting and ending.
    The element cpool's header is "WebSphere SR Ctx Cpool".
    The dump showed the the cpool had expanded may times.
    

Problem conclusion

  • The task level resource manager was updated to remove the
    queue element containing the ending thread's context
    from the queue of contexts.
    
    APAR PM90822 is currently targeted for inclusion in WebSphere
    Application Server Fix Packs 7.0.0.31, 8.0.0.8, and 8.5.5.2
    of WebSphere Application Server for z/OS.
    
    Please refer to URL:
    //www.ibm.com/support/docview.wss?rs=404&uid=swg27006970
    for Fix Pack availability.
    
    In addition, please refer to URL:
    http://www.ibm.com/support/docview.wss?rs=404&uid=swg27006970
    for Fix Pack PTF information.
    

Temporary fix

Comments

APAR Information

  • APAR number

    PM90822

  • 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

    2013-06-11

  • Closed date

    2013-08-27

  • Last modified date

    2014-02-05

  • 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

    WEBSPHERE FOR Z

  • Fixed component ID

    5655I3500

Applicable component levels

  • R700 PSY UI13725

       UP14/01/11 P F401

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.



Document information

More support for: WebSphere Application Server for z/OS
General

Software version: 7.0

Reference #: PM90822

Modified date: 05 February 2014