PH56510: ABEND5C6 00E20044 CSQIUOWA WHILE PROCESSING AN EUOWD WITHIN THE IUWD SACB 64 BIT QUICKCELL POOL

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• MQ Development finds that for an eUOWD that is larger than 4K,
  an ABEND5C6 00E20044 can occur when these are logged during
  checkpointing. It is invalid for an eUOWD to have a length
  greater than 4K. Given this, Development intends that this fix
  will enforce that limit to avoid such an abend.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All users of IBM MQ for z/OS Version 9       *
  *                 Release 3 Modification 0.                    *
  ****************************************************************
  * PROBLEM DESCRIPTION: A product bug existed in earlier        *
  *                      releases of IBM MQ which resulted in    *
  *                      the size of checkpointed eUOWD          *
  *                      increasing each time a QMGR was         *
  *                      restarted. If the size increased to     *
  *                      more than 4096 bytes, then the next     *
  *                      time the QMGR restarts, storage may be  *
  *                      overlaid.                               *
  *                                                              *
  *                      Internal storage manager changes at     *
  *                      affected releases mean that this        *
  *                      overlay could result in an              *
  *                      S5C6-00E20044 abend in CSQIUOWA during  *
  *                      QMGR startup. This will be proceeded by *
  *                      the QMGR terminating with reason        *
  *                      00D96001.                               *
  ****************************************************************
  APAR PI39539 fixed a problem whereby a checkpointed eUOWD
  increased in size each time the QMGR was restarted. However, the
  APAR did not attempt to correct the size of any already affected
  eUOWD.
  
  eUOWD are copied into fixed size buffers during QMGR startup,
  and if the size of the eUOWD exceeds the buffer size, then the
  following buffer will be overlaid.
  
  Internal changes were made to the management of these buffers at
  affected releases which makes the overlay more problematic. If
  an eUOWD overlays the following buffer and that buffer is
  subsequently required, then a S5C6-00E20044 abend will occur in
  CSQIUOWA.
  

Problem conclusion

• A code change has been made in CSQIUOWA to correct the length of
  checkpointed eUOWD during QMGR startup.
  

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:

  UI93822

Modules/Macros

• CSQI201M CSQIUOWA
  

Fix information

• Fixed component name

  IBM MQ Z/OS V9

• Fixed component ID

  5655MQ900

Applicable component levels

• R300 PSY UI93822

     UP23/10/10 P F310 ¢

Fix is available

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