PM85756: ABEND0C4 CMQXRSTF +00256 13/04/23 PTF PECHANGE

A fix is available

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APAR status

  • Closed as program error.

Error description

  • ABEND0C4 CMQXRSTF +00256
    Change Team finds that when a client is browsing a message
    on a transmission queue with a small buffer the MQGET returns
    MQRC 2079 ( MQRC_TRUNCATED_MSG_ACCEPTED ) and CSQXADPM invokes
    CSQAVICD to perform data-conversion. However, before doing so
    it sets the lCompCode and lReason to 0 (these would have been
    set to 1 and 2079). CSQAVICD then detects that a message with
    an XQH is being processed. However, the amount of message data
    available is not enough to perform the data conversion (due to
    the smaller buffer size). As lCompCode is now 0, CSQAVICD sets
    lCompCode to 1 and lReason to 2119, MQRC_NOT_CONVERTED
    This then results in subsequent processing not detecting that
    a truncated message was being processed, thus leading to the
    ABEND0C4.
    ADDITIONAL SYMPTOM :
    FFST in RSTSENDASYNCMESSAGE for Message length error
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED: All users of WebSphere MQ for z/OS Version 7 *
    *                 Release 1 Modification 0.                    *
    ****************************************************************
    * PROBLEM DESCRIPTION: After applying PTF UK83816 a multiplex  *
    *                      client browsing a transmission queue    *
    *                      receives RC=2119. CHINIT gets an 0C4    *
    *                      abend in program CMQXRSTF. Message      *
    *                      CSQX068I message may also appear in     *
    *                      CHINIT output.                          *
    ****************************************************************
    * RECOMMENDATION:                                              *
    ****************************************************************
    Multiplex client does an MQGET on a transmission queue with a
    small buffer and using options MQGMO_ACCEPT_TRUNCATED_MSG +
    MQGMO_CONVERT (and internally receives a MQCC=1, MQRC=2079)
    (MQRC_TRUNCATED_MSG_ACCEPTED). However because of PTF UK83816
    the compcode is reset to zero before calling CSQAVICD to do the
    convert. CSQAVICD detects that the message has an XQH and that
    there is not enough message data to perform the conversion.
    CSQAVICD, on seeing that the MQCC is now zero, sets a new
    compcode of 2, RC=2119 (MSG_NOT_CONVERTED).
    
    This causes rstCheckForOneMessage to invoke
    rstHandleMsgExpansion to obtain a buffer three times larger than
    the existing one in order to attempt the convert. However it
    copies from the old staging area specifying a length larger than
    the old staging area itself, possibly getting an 0C4 abend in
    CMQXRSTF.
    
    If there is no 0C4 then any subsequent MQGET from the
    transmission queue will request a buffer three times larger than
    the previous one which may eventually result in storage
    constraint within the CHINIT and for the scavenger to be
    invoked, as indicated by message CSQX068I.
    

Problem conclusion

  • Changed CSQXADPM so that the CompCode and Reason code are only
    set to zero if the conversion in CSQAVICD is redriven.
    100Y
    CSQACCF
    CSQACSTR
    CSQACS64
    CSQALOCT
    CSQAVICD
    CSQXADPM
    CSQXCNVT
    CSQXLOCT
    CSQXSPRT
    HMS7100J
    

Temporary fix

  • *********
    * HIPER *
    *********
    

Comments

APAR Information

  • APAR number

    PM85756

  • Reported component name

    WMQ Z/OS V7

  • Reported component ID

    5655R3600

  • Reported release

    100

  • Status

    CLOSED PER

  • PE

    YesPE

  • HIPER

    YesHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2013-03-27

  • Closed date

    2013-04-26

  • Last modified date

    2013-07-18

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

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

    UK93834

Modules/Macros

  • CSQACCF  CSQACSTR CSQACS64 CSQALOCT CSQAVICD
    CSQXADPM CSQXCNVT CSQXLOCT CSQXSPRT HMS7100J
    

Fix information

  • Fixed component name

    WMQ Z/OS V7

  • Fixed component ID

    5655R3600

Applicable component levels

  • R100 PSY UK93834

       UP13/06/14 P F306 ®

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


More support for:

z/OS family

Software version:

7.1

Reference #:

PM85756

Modified date:

2013-07-18

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