OA44082: LOOP IN MODULE ISTSDCCC +X'62E' - RUNNING A CHAIN OF MODEL RDTES THAT IS CORRUPTED.FINREVERSAL OA42880.

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• Loop in module ISTSDCCC +x'62E' - running a chain of
  model RDTEs that is corrupted.
  This is a FIN reversal of APAR OA42880 - which describes
  a different symptom of the same problem.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All users of VTAM model applications.        *
  ****************************************************************
  * PROBLEM DESCRIPTION: Loop in ISTSDCCC or ISTSDCLO after      *
  *                      failure of an activation of application *
  *                      major node containing a model           *
  *                      definition.                             *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  The problem may be summarized as follows:
  1. Some model application definitions have been previously
     activated.
  2. The activation of a new application major node, with a
     model application definition, fails. This failure can be for
     any number of reasons (one reason seen was a resource
     definition collision with a just created CDRSC in a very
     narrow timing window, another reason seen was that a
     table definition in the major node had a problem).
  3. During the cleanup of the application major node, the
     storage for the model application definition is freed,
     but the pointer to the storage is still on the chain
     of model application definitions.  This is the error.
  4. An application opens an ACB that uses one of the existing
     models to build a clone definition.  This clone definition
     reuses the freed storage.  At this point, the chain loops
     back on itself because the clone definition is on the chain
     and points back to its model definition which is earlier in
     the chain.
  5. Activating another application major node with a model
     definition will cause ISTSDCCC to loop, hanging all VTAM
     synchronous PABs.  Alternatively, opening another clone
     application may cause ISTSDCLO to loop, hanging all VTAM
     synchronous PABs.
  

Problem conclusion

• ISTSDCCC is updated to remove a model APPL definition's
  storage from the CSG_MDLAP chain before freeing the storage.
  

Temporary fix

• *********
  * HIPER *
  *********
  

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

• APAR is sysrouted TO one or more of the following:

  OA44136 UA71836 UA71837

Modules/Macros

• ISTSDCIO
  

Fix information

• Fixed component name

  VTAM V4 MVS/ESA

• Fixed component ID

  569511701

Applicable component levels

• R1C0 PSY UA71836

     UP14/03/14 P F403 Ž

• R1D0 PSY UA71837

     UP14/03/14 P F403 Ž

Fix is available

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