IBM Support

IT39234: Access violation in MQDISC causes timeouts with IBM Integration Bus (IIB) on Windows

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APAR status

  • Closed as program error.

Error description

  • Customer was using MQ 9.1.0.8 and the IIB connection has
    problems with MQDISC.
    The problem is an access violation:
    APPLICATION_FAULT_NULL_CLASS_PTR_READ_INVALID_POINTER_READ_AFTER
    _CALL
    
    The call stack is:
    
    
    STACK_TEXT:
    000000c4`012feb50 00007ff8`a3e908a1 : 000000c4`7d8dc8c0
    00007ff8`a8c503db 00000000`00000000 00000000`00000000 :
    mqe!xihCheckThreadList+0x1b2
    000000c4`012feba0 00007ff8`a3e3277e : 00000000`0140003e
    000000c4`012fef88 00000000`00000011 00000000`00000000 :
    mqe!xcsTerminate+0x191
    000000c4`012feef0 00007ff8`b3ad702f : 00000000`00000000
    000000c4`012fef88 000000c4`012fef84 000000c4`012fef78 :
    mqe!zswMQDISC_Call+0x9e
    000000c4`012fef30 00000000`00000000 : 000000c4`012fef88
    000000c4`012fef84 000000c4`012fef78 00000000`00123800 :
    LibraryLoader+0x702f
    .
    

Local fix

Problem summary

  • ****************************************************************
    USERS AFFECTED:
    Users of MQ and IIB on the Windows operating system
    
    
    Platforms affected:
    Windows
    
    ****************************************************************
    PROBLEM DESCRIPTION:
    During MQDISC processing, an invalid pointer operation caused a
    memory access violation whilst checking for any still running
    Windows threads.
    

Problem conclusion

  • MQDISC code now appropriately validates the pointer before use.
    
    MQ version 9.2.0.0 and later versions already contain the
    resolution to this problem.
    
    ---------------------------------------------------------------
    The fix is targeted for delivery in the following PTFs:
    
    Version    Maintenance Level
    v9.1 LTS   9.1.0.11
    v9.2 LTS   9.2.0.6
    v9.x CD    9.1.2
    
    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

    IT39234

  • Reported component name

    IBM MQ BASE MP

  • Reported component ID

    5724H7271

  • Reported release

    910

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2021-11-29

  • Closed date

    2022-01-20

  • Last modified date

    2022-06-16

  • 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

    5724H7271

Applicable component levels

[{"Line of Business":{"code":"LOB45","label":"Automation"},"Business Unit":{"code":"BU059","label":"IBM Software w\/o TPS"},"Product":{"code":"SSYHRD","label":"IBM MQ"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"910"}]

Document Information

Modified date:
17 June 2022