IBM Support

IT30721: FDC with probe ID XC130031 (Access violation/SIGSEGV) reported during client application disconnect

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APAR status

  • Closed as program error.

Error description

  • A 'C' client application connected to a queue manager providing
    an MQSCO structure with a non-null AuthInfoRecPtr field, a value
    of zero was supplied for the AuthInfoRecCount field. When the
    application disconnected a failure data capture (FDC) record
    with probe XC130031 was produced indicating a segmentation
    violation had occurred.
    

Local fix

  • Code application to provide a NULL AuthInfoRecPtr.
    

Problem summary

  • ****************************************************************
    USERS AFFECTED:
    Any native applications that provide MQSCO SSL configuration
    options programmatically via MQCONNX are potentially affected.
    
    
    Platforms affected:
    MultiPlatform
    
    ****************************************************************
    PROBLEM DESCRIPTION:
    A client application connected using custom SSL configuration
    options provided via an MQSCO structure, when the application
    disconnected from the queue manager a segmentation violation
    occurred in the MQDISC call, an FFST with a probe id of XC130031
    was produced.
    

Problem conclusion

  • In processing of a client application disconnect, various
    resources are freed, this includes memory used to retain a copy
    of the optional MQSCO and MQAIR values provided by an
    application. The IBM MQ KnowledgeCenter states that the
    AuthInfoRecPtr field of the MQSCO is ignored if the
    AuthInfoRecCount is zero - this does not occur and can cause a
    segmentation violation and FFST during application disconnect.
    
    The logic used to cleanup MQAIR resources during application
    disconnect is corrected to use the value of AuthInfoRecCount.
    
    ---------------------------------------------------------------
    The fix is targeted for delivery in the following PTFs:
    
    Version    Maintenance Level
    v8.0       8.0.0.14
    v9.0 LTS   9.0.0.9
    v9.1 CD    9.1.5
    v9.1 LTS   9.1.0.5
    
    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

    IT30721

  • Reported component name

    IBM MQ BASE MP

  • Reported component ID

    5724H7251

  • Reported release

    800

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2019-10-28

  • Closed date

    2020-01-13

  • Last modified date

    2020-01-13

  • 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

    IBM MQ BASE MP

  • Fixed component ID

    5724H7251

Applicable component levels

[{"Business Unit":{"code":"BU053","label":"Cloud & Data Platform"},"Product":{"code":"SSYHRD","label":"IBM MQ"},"Component":"","ARM Category":[],"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"8.0.0.0","Edition":"","Line of Business":{"code":"LOB36","label":"IBM Automation"}}]

Document Information

Modified date:
13 January 2020