PH54423: CSQBBCLS/CSQBBDSC GOT EXCEPTION DURING TERMINATION 23/05/19 PTF PECHANGE

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• When we canceled RRS region to simulate RRS failure, MQ code
  CSQBBCLS/CSQBBDSC got exception in 2 IIB Integration Server
  regions during termination. It issued an abend0c4 svcdump.
  .
  We can see 2 kinds of abend stack:
  .
  CSQBBCLS                        +????????    Exception
  MQCLOSE                         +????????
  
  MQConnection::reallyClose(bool) +????????
  
  MQConnection::close()           +????????
  .
  CSQBBDSC                        +????????    Exception
  MQDISC                          +????????
  MQConnection::reallyClose(bool) +????????
  MQConnection::close()           +????????
  .
  SYSTRACE shows the S0C4-00000010 abends occurring at
  CSQAPRHX while executing a key 7 MVCK because GPR1 points
  to freed storage.
  
  Earlier entries show the storage being freed by a STORAGE
  RELEASE from CSQMEOTC. CSQMEOTC was called due to incorrect
  checks in CSQAPRHX.
  .
  This problem is a regression caused by PSIRT APAR PH47725 with
  V920 PTF UI82092.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All users of IBM MQ for z/OS Version 9       *
  *                 Release 1 Modification 0,                    *
  *                 Release 2 Modification 0 and                 *
  *                 Release 3 Modification 0.                    *
  ****************************************************************
  * PROBLEM DESCRIPTION: When an RRS region is cancelled it is   *
  *                      possible for an 0C4 abend to occur      *
  *                      in CSQAPRHX.                            *
  ****************************************************************
  The code that handles end of task processing had an invalid
  check which resulted in CSQMEOTC being called. This resulted in
  storage being incorrectly freed. During subsequent processing
  in CSQAPRHX, the code attempted to use this now freed storage
  resulting in the 0C4 abend.
  

Problem conclusion

• The code has been changed to correct the invalid check to
  prevent storage being incorrectly freed and therefore prevent
  the 0C4 abend.
  

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:

  UI92522 UI92523 UI92524

Modules/Macros

• CSQAPRHX CSQARIB
  

Fix information

• Fixed component name

  IBM MQ Z/OS V9

• Fixed component ID

  5655MQ900

Applicable component levels

• R100 PSY UI92524

     UP23/07/15 P F307 {

• R200 PSY UI92523

     UP23/07/15 P F307 {

• R300 PSY UI92522

     UP23/07/15 P F307 {

Fix is available

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