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PI75103: CHIN ABEND WITH 502-00000000,RC=00000208 DUE TO THE LARGE NUMBER OF CLIENT CHANNELS USING SHARED CONVERSATIONS.

A fix is available

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APAR status

  • Closed as program error.

Error description

  • The customer received 502-00000000,RC=00000208  due to
    the large number of client channels using shared
    conversations.
    .
    CSQY291E CSQXDMPS SDUMPX FAILED, RC=00000208,XXXX,
     ABN= 502-00000000,LOC=        .????????+B8C68
    CSQX112E xxxx CSQXDISP Dispatcher process error,
     TCB=009B9968 reason=502000-00000000
    .
    This has caused the events table used by the async consume
    notify task (CSQXACNO) to become full (at MQ V8 the
    default size is 512 - at V710 the PTF for APAR PM76990
    increased the size from 512 to 2048).
    The customer can circumvent the problem by issuing the
    following command:
    .
    RECOVER QMGR(TUNE CHINASTHTBSZ 2048)
    
    .
    
    Note that this command will only take effect the next
    time the CHIN is started, and can be added to the
    queue-manager's CSQINP2 datasets.
    .
    The purpose of this APAR is look at increasing
    the size of the events table used by the async
    consume on a permanent basis.
    
    
    
    
    
    Additional Symptom(s) Search Keyword(s):
    

Local fix

  • RECOVER QMGR(TUNE CHINASTHTBSZ 2048)
    .
    Note that this command will only take affect the next
    time the CHIN is started, and can be added to the
    queue-manager's CSQINP2 datasets.
    

Problem summary

  • ****************************************************************
    * USERS AFFECTED: All users of IBM MQ for z/OS Version 9       *
    *                 Release 0 Modification 0.                    *
    ****************************************************************
    * PROBLEM DESCRIPTION: Abend S502 may occur when a large       *
    *                      number of messages arrive for           *
    *                      waiting SVRCONNs at once.               *
    ****************************************************************
    When a very large number of messages arrive for waiting SVRCONN
    channels with a SHARECNV value > 1, it is possible under
    certain circumstances that the processing of the arrival
    notifications for these messages may result in the events table
    filling up for the async-consumer notification task.
    In rare circumstances it is possible for the events table to
    fill up resulting in an S502 abend.
    

Problem conclusion

  • The size of the z/OS events table for the ECBs has been
    increased.
    

Temporary fix

Comments

APAR Information

  • APAR number

    PI75103

  • Reported component name

    MQ Z/OS V9

  • Reported component ID

    5655MQ900

  • Reported release

    000

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    YesHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2017-01-18

  • Closed date

    2017-01-25

  • Last modified date

    2018-08-03

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

    PI72414

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

    UI44195

Modules/Macros

  • CSQIRECP CSQXACNO
    

Fix information

  • Fixed component name

    MQ Z/OS V9

  • Fixed component ID

    5655MQ900

Applicable component levels

  • R000 PSY UI44195

       UP17/02/08 P F702

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:
03 August 2018