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IC73447: MEMORY LEAK IN V7.0 WEBSPHERE MQ CLASSES FOR JMS WHEN TRACING IS ENABLED

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APAR status

  • Closed as program error.

Error description

  • When the V7.0 WebSphere MQ classes for JMS tracing is enabled
    for a long time, an OutOfMemory error is observed. The
    generated heap dump shows the following leak suspect:
    
    246,668,272 (93%) [152] 1 com/ibm/rds/RDSCache 0xc216e8
    246,668,120 (93%) [72] 4 java/util/logging/Logger 0xc21658
    246,597,112 (93%) [24] 3 java/util/logging/LogManager 0x98f860
    246,577,920 (93%) [40] 1 java/util/Hashtable 0xa0c298
    246,577,880 (93%) [784] 98 array of
    java/util/Hashtable$Entry 0x21d3120
    246,435,320 (93%) [32] 3 java/util/Hashtable$Entry 0x1259848
    246,434,344 (93%) [72] 6 java/util/logging/Logger 0x125d398
    246,434,152 (93%) [80] 1 array of
    java/util/logging/Handler 0x1262d80
    246,434,072 (93%) [88] 12 java/util/logging/FileHandler
    0x1264d38
    246,409,784 (93%) [64] 5
    com/ibm/msg/client/commonservices/j2se/trace/HumanFormatter
    0x1264d90
    246,368,608 (93%) [32] 4
    
    com/ibm/msg/client/commonservices/j2se/trace
    /HumanFormatter$FastHashMap
    0x12689c0
    246,368,192 (93%) [48] 2 java/util/HashMap 0x1289fc8
    246,368,128 (93%) [4,194,320] 417,238 array of
    java/util/HashMap$Entry 0xe905588
    
    This issue is observed when the using the V7.0 WebSphere MQ
    classes for JMS tracing with wrapping options set and the
    output destination set to a file.
    

Local fix

Problem summary

  • ****************************************************************
    USERS AFFECTED:
    This issue affects users of the V7.0 WebSphere MQ classes for
    JMS who enable the WebSphere MQ classes for JMS trace.
    
    Platforms affected:
    All Distributed (iSeries, all Unix and Windows) +Java
    ****************************************************************
    PROBLEM SUMMARY:
    One of the data structures used for maintaining the cache for
    WebSphere MQ JMS tracing was not being cleared. This led to a
    slow accumulation of objects in the java heap, which eventually
    led to a OutOfMemory error when tracing was left running for a
    long length of time.
    

Problem conclusion

  • The code fix associated with this APAR ensures that the number
    of objects in the cache do not overflow, and hence ensures that
    the java heap is not filled up while writing the trace output.
    
    ---------------------------------------------------------------
    The fix is targeted for delivery in the following PTFs:
    
                       v7.0
    Platform           Fix Pack 7.0.1.6
    --------           --------------------
    Windows            U200328
    AIX                U840698
    HP-UX (PA-RISC)    U841555
    HP-UX (Itanium)    U841560
    Solaris (SPARC)    U841556
    Solaris (x86-64)   U841562
    iSeries            tbc_p700_0_1_6
    Linux (x86)        U841557
    Linux (x86-64)     U841561
    Linux (zSeries)    U841558
    Linux (Power)      U841559
    
    The latest available maintenance can be obtained from
    'WebSphere MQ Recommended Fixes'
    http://www-1.ibm.com/support/docview.wss?rs=171&uid=swg27006037
    
    If the maintenance level is not yet available, information on
    its planned availability can be found in 'WebSphere MQ
    Planned Maintenance Release Dates'
    http://www-1.ibm.com/support/docview.wss?rs=171&uid=swg27006309
    ---------------------------------------------------------------
    

Temporary fix

Comments

APAR Information

  • APAR number

    IC73447

  • Reported component name

    WMQ WINDOWS V7

  • Reported component ID

    5724H7220

  • Reported release

    700

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2010-12-22

  • Closed date

    2011-01-28

  • Last modified date

    2011-02-08

  • 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

    WMQ WINDOWS V7

  • Fixed component ID

    5724H7220

Applicable component levels

  • R700 PSY

       UP

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Document Information

Modified date:
08 February 2011