PM70347: S0C4 ABEND'S OCCUR IN APPLICATION ADDRESS SPACE WHEN A CSQSNAP DUMP IS BEING FORMATTED.

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• When an abend occurs whilst running an MQ batch job with a
  CSQSNAP DD card, S0C4 abends can be observed in the logrec
  in CSQWDCBF.
  When the abend occurs, formatting code is run in the application
  address space to produce some output relating to the problem
  that occured. Anchors and their associated blocks are formatted
  by CSQWDHPP, which sets up the WDIB block and invokes CSQWDCBF
  to format the individual blocks.
  In the initialisation of WDIB, the WDIBFMTP is not set, and the
  FMT_PARM block is not initialised. CSQWDCBF however requires
  this block to be set up, and expects WDIBFMTP to point to it.
  Since this is not the case, CSQWDCBF abends with S0C4.
  

Local fix

• Allocate and initialise the FMT_PARM block and set WDIBFMTP.
  

Problem summary

• ****************************************************************
  * USERS AFFECTED: All users of WebSphere MQ for z/OS Version 7 *
  *                 Release 1 Modification 0.                    *
  ****************************************************************
  * PROBLEM DESCRIPTION: The application address space abends    *
  *                      with S0C4-00000004 when formatting      *
  *                      diagnostic information into CSQSNAP.    *
  *                      This abend can only be seen in the      *
  *                      logrec view.                            *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  When an abend happens during MQ processing, some dump
  information is formatted to the joblog of the application
  if the CSQSNAP card is defined. This causes CSQWDHPP to be
  invoked, which sets up the WDIB block and iterates through the
  anchors in the anchor table and formats them along with the
  blocks by invoking CSQWDCBF. This module expects the WDIB to be
  setup and WDIBFMTP to point to a valid FMT_PARM block. CSQWDPRD,
  which is used when analysing dumps in IPCS, does allocate and
  initialise this block, however this is not the case for
  CSQWDHPP. When CSQWDCBF tries to refer to the FMT_BLOCK, the 0C4
  abend occurs, as the pointer to it in the WDIB block is null.
  

Problem conclusion

• The code was changed to correctly intialise the FMT control
  block and set the pointer to it in the WDIB control block.
  100Y
  CSQWDHPP
  

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:

  UK83714

Modules/Macros

• CSQWDHPP
  

Fix information

• Fixed component name

  WMQ Z/OS V7

• Fixed component ID

  5655R3600

Applicable component levels

• R100 PSY UK83714

     UP13/01/16 P F301

Fix is available

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