PH25132: ABN=B78-18 and ABN=0C4-11,U=CICSTS,C=MMC-CSQMCALH, M=CSQGFRCV,LOC=CSQMLPLM.CSQMCALH

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• ABN=B78-00000018,U=CICSTS  ,C=MMC -CSQMCALH,M=CSQGFRCV
  ABN=0C4-00000011,U=CICSTS  ,C=MMC -CSQMCALH,
  M=CSQGFRCV,LOC=CSQMLPLM.CSQMCALH
  
  The 0C4 and B78 abends in CSQMCALH occur when attempting to
  free the QINFO block associated with a handle for an AMS
  protected queue during local memory termination processing for
  a CICS connection to MQ, because the TCB that owns the storage
  has already ended and consequently the storage has already been
  freed (and potentially reused).
  .
  Additional Keywords:
  ABENDB78 ABENDSB78 ABEND0C4 ABENDS0C4
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All users of IBM MQ for z/OS Version 9       *
  *                 Release 1 Modification 0 and Release 2       *
  *                 Modification 0.                              *
  ****************************************************************
  * PROBLEM DESCRIPTION: Abends B78 and/or 0C4 occur in          *
  *                      CSQMLPLM.CSQMCALH when the MQ adapter   *
  *                      terminates the connection to MQ, and    *
  *                      the adapter is using AMS protected      *
  *                      queues.                                 *
  ****************************************************************
  During MQ adapter termination CSQMCLMT is called to end any
  ACEs remaining for the address space, and as part of this, to
  close any remaining handles.
  While closing handles for AMS protected queues, an attempt to
  free AMS control blocks in the CICS address space is made,
  however at this point in termination processing the TCB owning
  these control blocks has already ended and implicitly freed the
  storage.
  The attempt to access/free the storage after this results in the
  reported abend.
  

Problem conclusion

• CSQMCALH is changed to detect when it is called during local
  memory termination processing and to avoid incorrectly
  attempting to free the AMS control blocks a second time.
  

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:

  UI71006 UI72356

Modules/Macros

• CSQMCALH
  

Fix information

• Fixed component name

  IBM MQ Z/OS V9

• Fixed component ID

  5655MQ900

Applicable component levels

• R100 PSY UI71006

     UP20/11/02 P F010

• R200 PSY UI72356

     UP20/12/07 P F012

Fix is available

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