IBM Support

IT27095: RESTRICT XLXP SYMBOL TABLE FROM GROWING IN ORDER TO STOP ABENDS FROM HAPPENING

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APAR status

  • Closed as program error.

Error description

  • If the symbol table grows beyond a certain size, e.g.
    256Kb then it can trigger abends that include the following
    XLXP function call :
    
    SymbolTable_scanQNameBuffered2 from
    /opt/ibm/mqsi/iib-10.0.0.11/server/xlxpc/lib/libBIPNVBRT.so.11
    

Local fix

Problem summary

  • ****************************************************************
    USERS AFFECTED:
    <span style="background-color:rgb(255, 255, 255)">All users of
    IBM Integration Bus V10.0 and IBM App Connect Enterprise V11.0
    using  XMLNSC, SOAP or DataObject domain. </span>
    
    
    Platforms affected:
    z/OS, MultiPlatform
    
    ****************************************************************
    PROBLEM DESCRIPTION:
    <span style="background-color:rgb(255, 255, 255)">XMLNSC parser
    crashes occasionally with the following call </span>
    <span style="background-color:rgb(255, 255, 255)">
    
    </span>
    <span style="background-color:rgb(255, 255,
    255)">SymbolTable_scanQNameBuffered2 from </span><span
    style="background-color:rgb(255, 255,
    255)">/opt/ibm/mqsi/iib-10.0.0.11/server/xlxpc/l</span>
    
    The reason being a growth in the internal symbol table used by
    the parser.
    The issue may appear in SOAP, DataObject parsers as they
    internally make use of XMLNSC parser.
    

Problem conclusion

  • A new property named 'symbolTableThresholdInKB' is introduced
    for XMLNSC parser which can be used to set an upper limit on its
    internal symbol table size.  It can be set as below
    
    mqsichangeproperties node_name -e server_name -o
    ComIbmGenericXmlParserFactory -n symbolTableThresholdInKB -v
    <value in kb. for eg: 1>
    
    For stand-alone integration servers, the property can be set in
    the server.conf.yaml under the XMLNSC section.
    
    With this property being set, the XMLNSC parser will release all
    its cached objects once its symbol table size reaches the
    threshold value. You can see the following message in activity
    log when this happens
    
    <span style="background-color:rgb(255, 255, 255)">BIP11311W :
    The parser of type 'XMLNSC' has been reset due to the
    symbolTableThresholdInKB threshold being reached. </span>
    
    ---------------------------------------------------------------
    The fix is targeted for delivery in the following PTFs:
    
    Version    Maintenance Level
    v10.0      10.0.0.17
    v11.0      11.0.0.9
    
    The latest available maintenance can be obtained from:
    http://www-01.ibm.com/support/docview.wss?rs=849&uid=swg27006041
    
    If the maintenance level is not yet available,information on
    its planned availability can be found on:
    http://www-1.ibm.com/support/docview.wss?rs=849&uid=swg27006308
    ---------------------------------------------------------------
    

Temporary fix

Comments

APAR Information

  • APAR number

    IT27095

  • Reported component name

    INTEGRATION BUS

  • Reported component ID

    5724J0540

  • Reported release

    A00

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2018-11-27

  • Closed date

    2020-04-20

  • Last modified date

    2020-04-20

  • 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

    INTEGRATION BUS

  • Fixed component ID

    5724J0540

Applicable component levels

[{"Business Unit":{"code":"BU053","label":"Cloud & Data Platform"},"Product":{"code":"SSNQK6","label":"IBM Integration Bus"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Line of Business":{"code":"LOB36","label":"IBM Automation"}}]

Document Information

Modified date:
21 April 2020