OA44136: 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:                                              *
  * Apply PTF.                                                   *
  ****************************************************************
  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:

  OA44082

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

  UA71855

Modules/Macros

• ISTSDCIO
  

Fix information

• Fixed component name

  VTAM V4 MVS/ESA

• Fixed component ID

  569511701

Applicable component levels

• R210 PSY UA71855

     UP14/03/14 P F403

Fix is available

• Select the PTF appropriate for your component level. You will be required to sign in. Distribution on physical media is not available in all countries.