PQ34234: ABND=0C4-00000004,M=DSNAPRHX,LOC=DSN3EPX.DSNAET03+02B8

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• DSNAET03 is processing a D972 0070 3000 (MVCK inst) and it
  failed because reg3 storages were key 0 while it expected to
  be key 8 that was specified in reg11.
  .
  APAR PQ04003 updated DSNAET03 to move the feedback
  code into the private area of DSNAET03. Under certain
  circumstances, FRBFBACK points to the RIB, which is
  key 0 storage.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: Users of DB2 data bases.                     *
  ****************************************************************
  * PROBLEM DESCRIPTION: Before DSNAET03 moves the FRB           *
  *                      feedback code into private              *
  *                      storage, it determines                  *
  *                      whether there is a feedback             *
  *                      code by checking FRBFBACK for           *
  *                      zeroes.                                 *
  *                      In this case, DSNAET03 was called as    *
  *                      a result of a "subsystem not            *
  *                      operational" condition (SNO             *
  *                      exit). FRBFBACK                         *
  *                      contained the RIB address,              *
  *                      not the address of the                  *
  *                      feedback area.  DSNAET03                *
  *                      received an 0C4 when it tried           *
  *                      to access storage beyond the            *
  *                      RIB.                                    *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  When DSNAET03 moves the FRB
  feedback code into private
  storage, it determines
  whether there is a feedback
  code by checking FRBFBACK for
  zeroes.
  When DSNAET03 is called as a result
  of a "subsystem not operational"
  condition (SNO exit), FRBFBACK
  contains the RIB address,
  not the address of the
  feedback area.  DSNAET03
  received an 0C4 when it tried
  to access storage beyond the RIB.
  
  A similar problem was
  encountered by CICS, and a
  similar solution applied, by
  PN09681.
  DSNMSNO0 was changed to clear
  the FRBFBACK field before
  calling the translation routine.
  

Problem conclusion

• When DSNAET03 moves the FRB
  feedback code into private
  storage, it determines
  whether there is a feedback
  code by checking FRBFBACK for
  zeroes.
  When DSNAET03 is called as a result
  of an IMS SNO exit (subsystem not
  operational) getting control,
  FRBFBACK contains the RIB
  address instead of the address
  of the feedback area. The 0C4
  resulted when DSNAET03 tried
  to access storage beyond the
  RIB.
  The solution was to zero out
  the FRBFBACK field
  in DSNMSNO0 before calling
  the translation routine so that
  the translation routine would not
  erroneously try to access the
  feedback code.
  A similar problem was
  reported for CICS via PN09681 and
  was resolved via a similar
  solution.
  

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:

  UQ40481 UQ40482

Modules/Macros

•    DSNMSNO0
  

Fix information

• Fixed component name

  5740 IMS V1 ATT

• Fixed component ID

  5740IY100

Applicable component levels

• R510 PSY UQ40481

     UP00/03/06 P F003

• R610 PSY UQ40482

     UP00/03/06 P F003

Fix is available

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