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PI84078: WMQ 7.1: CHIN FAILS WITH ABN=5C6-00940001 DUE TO INVALID SEQUENCE OF XA FLOWS FROM CLIENT

A fix is available

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APAR status

  • Closed as program error.

Error description

  • Chin abend with ABN=5C6-00940001 due to invalid
    sequence of XA flows from client
    
    Queue manager is abending rather then rejecting the
    incorrect XA call.
    

Local fix

  • investigate the client application to determine the incorrect
    sequence of xa calls
    

Problem summary

  • ****************************************************************
    * USERS AFFECTED: All users of WebSphere MQ for z/OS Version 7 *
    *                 Release 1 Modification 0                     *
    ****************************************************************
    * PROBLEM DESCRIPTION: XA_START calls are incorrectly accepted *
    *                      from applications while they are still  *
    *                      associated with a previous XA           *
    *                      transaction, resulting in unexpected    *
    *                      behaviour on subsequent calls.          *
    ****************************************************************
    * RECOMMENDATION:                                              *
    ****************************************************************
    An application which is actively associated with an XA
    transaction should not be able to successfully start a new XA
    transaction through a XA_START call. However this is not being
    correctly restricted. If used with CSQSERVICE1, this can result
    in other XA calls being unable to correctly find the associated
    XID, resulting in various abends, including 5C6-00940001 when
    XA_END is issued for a started XID.
    

Problem conclusion

  • XA processing has been changed to correctly reject XA_START when
    an application is already associated with an XA transaction for
    non-TMF MQ applications.
    100Y
    CSQMXARH
    

Temporary fix

Comments

APAR Information

  • APAR number

    PI84078

  • Reported component name

    WMQ Z/OS V7

  • Reported component ID

    5655R3600

  • Reported release

    100

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2017-07-07

  • Closed date

    2017-12-12

  • Last modified date

    2018-01-06

  • APAR is sysrouted FROM one or more of the following:

  • APAR is sysrouted TO one or more of the following:

    PI90327 PI90331 UI52836

Modules/Macros

  • CSQMXARH
    

Fix information

  • Fixed component name

    WMQ Z/OS V7

  • Fixed component ID

    5655R3600

Applicable component levels

  • R100 PSY UI52836

       UP18/01/06 I 1000

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 MQ
APAR / Maintenance

Software version: 7.1

Reference #: PI84078

Modified date: 06 January 2018


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