PH71458: MQFB_IIH_ERROR OCCURS WHEN CHIN PUTS A MESSAGE TO AN IMS BRIDGE QUEUE

APAR status

• Closed as program error.

Error description

• The problem occurs during the put of a message to an IMS bridge
  queue by the CHIN. In this case the data is converted to the
  QMGR CCSID before the put of the message. If the message
  contains bytes which expand on conversion, then the initial
  conversion fails internally with MQRC_CONVERTED_MSG_TOO_BIG.
  This drives the CHIN to allocate a new, bigger buffer to
  reattempt the conversion. The subsequent conversion is
  successful, but the problem is that the QRPL isn't updated
  correctly for the subsequent put, so the original unconverted
  message data is used for the put to the queue.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All users of IBM MQ for z/OS Version 9       *
  *                 Release 4 Modification 0.                    *
  ****************************************************************
  * PROBLEM DESCRIPTION: When putting a message to an IMS bridge *
  *                      queue where data conversion is required *
  *                      and the conversion causes the message   *
  *                      buffer to be reallocated, the message   *
  *                      written to the IMS queue will contain   *
  *                      the original unconverted data. This may *
  *                      cause the following symptoms:           *
  *                                                              *
  *                      - The message is put to the dead letter *
  *                      queue with reason MQFB_IIH_ERROR.       *
  *                      - The put may fail with MQRC_IIH_ERROR. *
  ****************************************************************
  During IMS data conversion processing, when the conversion of a
  message requires a larger buffer to be allocated to hold the
  converted data, the internal queue request control blocks were
  not updated to reflect the new buffer address. As a result, when
  the MQPUT was retried following the conversion, it used the
  original pre-conversion buffer rather than the newly allocated
  buffer containing the converted message data, causing the
  unconverted message data to be written to the IMS queue instead
  of the converted data.
  

Problem conclusion

• The IMS data conversion processing has been updated to check
  whether a new buffer was allocated during data conversion. If a
  larger new buffer was allocated to hold the converted message,
  the queue request control blocks are now updated to point to the
  new buffer with the converted message.
  

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:

  PH71934 UO08722

Modules/Macros

• CSQXADPM
  

Fix information

• Fixed component name

  IBM MQ Z/OS V9

• Fixed component ID

  5655MQ900

Applicable component levels