PH67086: MQ Z/OS V9.4.0: ABEND0C4 IN LOAD MODULE CSQAVICM CSECT CSQAIVS6 DURING DATA CONVERSION FOR FORMAT MQIMSVS

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• After migration to IBM MQ 9.4 for z/OS, the CHIN address space
  receives an ABEND0C4: CSQX112E CSQXDISP Dispatcher process error
  0C4000-00000011 DUMP TITLE: ssid,ABN=
  0C4-00000011,C=MQ900.940.CHIN,M=CSQXDISP,LOC=CSQAVICM.
  ????????+19066 The program interrupt is in CSECT
  CSQAIVS6+x'6A6'. Reg1 is bad. The code is working with data
  conversion of a message with an MQMD.Format of MQIMSVS and
  byte-swapped (little endian) data. The bug was exposed at V9.4.0
  LTS by changes related to CHIN 64-bit buffers. Additional
  keywords and symptoms: IMS Bridge
  

Local fix

• N/A
  

Problem summary

• ****************************************************************
  * USERS AFFECTED: All users of IBM MQ for z/OS Version 9       *
  *                 Release 4 Modification 0                     *
  ****************************************************************
  * PROBLEM DESCRIPTION: When putting large messages with        *
  *                      MQFMT_IMS_VAR_STRING format and little  *
  *                      endian data over a Channel, an ABEND0C4 *
  *                      may be experienced in the channel       *
  *                      initiator and MQRC_CONNECTION_BROKEN    *
  *                      may be returned to the putting          *
  *                      application.                            *
  ****************************************************************
  When a message is big enough that data conversion needs to
  allocate a temporary 64-bit buffer for use during data
  conversion, CSQAIVS6 is called to convert the MQIMSVS format
  data, but it uses an intermediate 31-bit pointer to reference
  the data when byteswapping. This results in an incorrect access
  of the buffer and the subsequent S0C4 abend.
  

Problem conclusion

• Data Conversion now uses a 64-bit pointer to point to the input
  data if in amode64
  

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:

  UO04563

Modules/Macros

• CSQAIVS6
  

Fix information

• Fixed component name

  IBM MQ Z/OS V9

• Fixed component ID

  5655MQ900

Applicable component levels

• R400 PSY UO04563

     UP25/09/13 P F509

Fix is available

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