PI72414: CHIN ABEND WITH 502-00000000,RC=00000208 DUE TO THE LARGE NUMBER OF CLIENT CHANNELS USING SHARED CONVERSATIONS.

Obtain the fix for this APAR.

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):
  ABEND502 ABENDS502
  

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 WebSphere MQ for z/OS Version 8 *
  *                 Release 0 Modification 0.                    *
  ****************************************************************
  * PROBLEM DESCRIPTION: Abend S502 may occur when a large       *
  *                      number of messages arrive for           *
  *                      waiting SVRCONNs at once.               *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  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.
  000Y
  CSQIRECP
  CSQXACNO
  

Temporary fix

Comments

APAR Information

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

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

  PI75103 UI44193

Modules/Macros

• CSQIRECP CSQXACNO
  

Fix information

• Fixed component name

  WMQ Z/OS 8

• Fixed component ID

  5655W9700

Applicable component levels

• R000 PSY UI44193

     UP17/03/04 P F703

Fix is available

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