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PH29385: CSQX541E WITH DATA CONVERSION FAILED FFST WHILE CONVERTING MQPMO FROM CCSID 1208 TO 500

A fix is available

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APAR status

  • Closed as program error.

Error description

  • The FFST is occurring due to being unable to convert the MQPMO
    structure. When an MQPMO is received, the character fields are
    converted from their received CCSID (1208 - ASCII in this case)
    to the CCSID of the system (500 - EBCDIC). Since the
    ResolvedQMgrName and ResolvedQName are output only fields,
    queue manager doesn't convert them upon receipt, and instead
    rely on them being populated during the proceeding MQPUT. The
    queue manager subsequently convert all of the character fields
    back (EBCDIC to ASCII) before returning them to the sender.
    
    Most of the time this is fine, since the MQPUT will populate
    the ResolvedQMgrName and ResolvedQName fields with EBCDIC data
    which can be converted as required. However, in this case, the
    put is to an ALIAS queue which resolves to a TOPIC, so the
    queue manager doesn't fill in the ResolvedQMgrName and
    ResolvedQName fields. This leads the queue manager to thinking
    that they must be in EBCDIC, but they're actually still in
    ASCII (since conversion was skipped before). This is what
    causes the conversion problems and the FFST.
    

Local fix

  • Explicitly set the ResolvedQMgrName and ResolvedQName fields to
    '00'x
    

Problem summary

  • ****************************************************************
    * USERS AFFECTED: All users of IBM MQ for z/OS Version 9       *
    *                 Release 0 Modification 0, Release 1          *
    *                 Modification 0 and Release 2 Modification 0. *
    ****************************************************************
    * PROBLEM DESCRIPTION: When putting a message from an ASCII    *
    *                      environment to an alias queue which     *
    *                      resolves to a topic, if the output-only *
    *                      MQPMO fields ResolvedQName or           *
    *                      ResolvedQMgrName contain certain ASCII  *
    *                      characters, then CSQX053E and CSQX541E  *
    *                      messages may be issued in the CHIN. The *
    *                      CSQX053E message is accompanied by an   *
    *                      FFST.                                   *
    *                                                              *
    *                      In this scenario the application will   *
    *                      also receive an MQRC 2009               *
    *                      (MQRC_CONNECTION_BROKEN). Depending on  *
    *                      the syncpoint options on the MQPUT, the *
    *                      publish to the topic may or may not     *
    *                      have succeeded.                         *
    ****************************************************************
    The problem occurs when converting the MQPMO character fields
    ResolvedQName and ResolvedQMgrName. Since they are output-only
    fields, they are not converted to the QMGR CCSID before the
    MQPUT, instead only being converted to the client CCSID after
    they have been populated by the MQPUT.
    
    When the MQPUT is to an alias queue which resolves to a topic,
    these fields do not get populated, meaning that they will be
    interpreted as EBCDIC characters for the conversion back to
    ASCII. Depending on the original ASCII characters present in
    these fields, this conversion may fail.
    

Problem conclusion

  • The code has been changed to treat the conversion of the MQPMO
    output-only fields correctly when putting to an alias queue to a
    topic.
    

Temporary fix

Comments

APAR Information

  • APAR number

    PH29385

  • Reported component name

    IBM MQ Z/OS V9

  • Reported component ID

    5655MQ900

  • Reported release

    100

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2020-09-10

  • Closed date

    2020-12-02

  • Last modified date

    2021-02-01

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

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

    UI72878 UI72879 UI72880

Modules/Macros

  • CMQXRSRV
    

Fix information

  • Fixed component name

    IBM MQ Z/OS V9

  • Fixed component ID

    5655MQ900

Applicable component levels

  • R000 PSY UI72878

       UP21/01/28 P F101

  • R100 PSY UI72879

       UP21/01/28 P F101

  • R200 PSY UI72880

       UP21/01/28 P F101

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.

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Document Information

Modified date:
02 February 2021