PM80577: WHEN RUNNING A PRE-V710 VERSION OF CSQBRRSI WITH V710 VERSION SCSQAUTH, AN MQRC 2002 CAN OCCUR EVEN AFTER MQDISC.

A fix is available

Subscribe

You can track all active APARs for this component.

APAR status

  • Closed as program error.

Error description

  • The customer is running a batch job was running fine until
    they upgraded their early code and SCSQAUTH to V710. The batch
    job in question is issuing MQCONN, followed by some MQPUTs /
    PUT1 and then a MQDISC. It then attempts another MQCONN but
    unexpectedly fails with a 2002 MQRC_ALREADY_CONNECTED.
    .
    The change team looked at the code and can see the cause of
    the problem. The problem occurs when an application linked
    with a pre-V710 version of CSQBRRSI is run with a V710 version
    of the SCSQAUTH dataset (so that the application is using the
    V710 version of CSQBCON, CSQBDSC etc). The offset of the
    fRRSDisc flag in the BLOA has changed between V701 and V710,
    hence the MQRC 2002 may occur even though an MQDISC has been
    issued.
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED: All users of WebSphere MQ for z/OS Version 7 *
    *                 Release 1 Modification 0.                    *
    ****************************************************************
    * PROBLEM DESCRIPTION: An application linked using CSQBRRSI or *
    *                      CSQBRSTB at a release prior to 710      *
    *                      receives MQRC_ALREADY_CONNECTED         *
    *                      (MQRC2002) when using MQCONN to         *
    *                      reconnect to the queue manager, even    *
    *                      if MQDISC was previously issued.        *
    *                      If the application was linked at        *
    *                      701 with the fix for PM70746 applied,   *
    *                      and MQCONN is called to reconnect to    *
    *                      the queue manager, it receives          *
    *                      MQRC_ENVIRONMENT_ERROR (MQRC2012).      *
    ****************************************************************
    * RECOMMENDATION:                                              *
    ****************************************************************
    When an application linked with an RRS stub calls MQDISC to
    disconnect from the queue manager, a flag is set in the bloa to
    indicate this.
    An optimisation in the stubs uses this flag to check if the
    application has disconnected without the overhead of loading
    CSQBCON.
    Between 701 and 710 the offset of this flag within the BLOA was
    changed, causing this optimisation to incorrectly flag that
    the application is still connected when the application was
    compiled with 701 stub code, and connects to the queue manager
    using 710 adapter code.
    
    Additional Keywords: 2002 2012
    

Problem conclusion

  • The adapter code is changed to set the flags required for the
    optimisation at the correct offsets for both the 701 and 710 RRS
    stubs.
    100Y
    CSQBCON
    CSQBDSC
    CSQBRRSI
    CSQBRSTB
    CSQBSRV
    CSQBTEXT
    CSQMEOTC
    CSQXACON
    CSQXDSC
    IMQS23DR
    

Temporary fix

Comments

APAR Information

  • APAR number

    PM80577

  • Reported component name

    WMQ Z/OS V7

  • Reported component ID

    5655R3600

  • Reported release

    100

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2013-01-14

  • Closed date

    2013-03-18

  • Last modified date

    2013-05-06

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

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

    UK92602

Modules/Macros

  •    CSQBCON  CSQBDSC  CSQBRRSI CSQBRSTB CSQBSRV
    CSQBTEXT CSQMEOTC CSQXACON CSQXDSC  IMQS23DR
    

Fix information

  • Fixed component name

    WMQ Z/OS V7

  • Fixed component ID

    5655R3600

Applicable component levels

  • R100 PSY UK92602

       UP13/04/04 P F304

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.



Rate this page:

(0 users)Average rating

Add comments

Document information


More support for:

z/OS family

Software version:

100

Reference #:

PM80577

Modified date:

2013-05-06

Translate my page

Machine Translation

Content navigation