PH65669: ABN=5C6-EBEBEBED,U=XXXXXXXX,C=MQ900.920.MMC -CSQMALCH,M=CSQGFRCV,LOC=CSQMGPLM.CSQMBALC+OFFSET

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• The S5C6-EBEBEBED abend in CSQMBALC is occurring because the
  MBAL control block provided by the caller doesn't contain a
  reference to an SKB stack block. The MBAL is initialised in
  CSQBCON as part of the connect while still in the HOME address
  space. The V920 CSQBCON initialises an SKB and stores it's
  address in the MBAL to be used later in the QMGR if stack
  storage is required in the HOME address space. The V940 CSQBCON
  however, does not setup an SKB and instead uses a different
  mechanism for obtaining storage in the application HOME address
  space. The QMGR code is at the V920 level, however the
  application is using a V940 SCSQAUTH which means that the MQCONN
  will LINK to the V940 CSQBCON.
  

Local fix

• Run the application using a SCSQAUTH which matches the QMGR
  level.
  

Problem summary

• ****************************************************************
  * USERS AFFECTED: All users of IBM MQ for z/OS Version 9       *
  *                 Release 4 Modification 0.                    *
  ****************************************************************
  * PROBLEM DESCRIPTION: An application abend S5C6-EBEBEBED      *
  *                      occurred in module CSQMBALC when the    *
  *                      size of buffer used for asynchronous    *
  *                      gets (e.g. callbacks registered with    *
  *                      MQCB) needed to be increased. The abend *
  *                      was triggered when the application      *
  *                      running with the v940 batch adapter had *
  *                      connected to a V920 queue manager.      *
  ****************************************************************
  The abend was caused by the absence of a valid SKB stack block
  in the MBAL control block. In previous versions of MQ, CSQBCON
  initializes an SKB and stores its address in the MBAL for later
  use by the queue manager. However, in V940, the SKB block was
  replaced with a different mechanism for the stack storage. When
  an application using V940 adapter libaries connects to a queue
  manager running at V920 the MBAL lacks the required SKB, leading
  to the abend.
  

Problem conclusion

• The CSQBCON module has been updated to restore the SKB
  initialisation logic.
  

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:

  UO07277

Modules/Macros

• CSQBCON
  

Fix information

• Fixed component name

  IBM MQ Z/OS V9

• Fixed component ID

  5655MQ900

Applicable component levels

• R400 PSY UO07277

     UP26/04/14 P F604

Fix is available

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