PH46343: WHEN IMS HP IMAGE COPY SCHEDULES IN DRF, IMS HP IMAGE COPY OVERLAYS STORAGE BEYOND THE OUTPUT IC BUFFER

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• If the length of the output buffer area for ICDS is 1 byte
  longer than the length of the IC record, IMS HP Image copy
  incorrectly clears 256 bytes when it should clear 1 byte. As a
  result, the storage located adjacent to the output buffer is
  overwritten and DRF terminates with an unexpected error.
  
  In one case, the VSAM IDARCWA work area was overlaid with zeroes
  causing an ABEND0C4 in IDA019L1. IMS database segment data can
  be seen directly above the overlay area in storage.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All users of IMS High Performance Image Copy *
  *                 for z/OS Version 4 Release 2                 *
  *                 ( FMID=H1J0420 ) who use it with IMS         *
  *                 Reorganization Expert or Database Recovery   *
  *                 Facility of IMS Recovery Solution Pack.      *
  ****************************************************************
  * PROBLEM DESCRIPTION: When the following conditions are met,  *
  *                      an unexpected error occurs:             *
  *                      - IMS HP Image Copy is scheduled in     *
  *                        Database Recovery Facility (DRF) of   *
  *                        IMS Recovery Solution Pack or IMS     *
  *                        Database  Reorganization Exert (RGE)  *
  *                        type-A                                *
  *                      - Output image copy data set is not     *
  *                        compressed                            *
  *                      - The record length of input DBDS is    *
  *                        one byte shorter than a multiple of 8 *
  ****************************************************************
  * RECOMMENDATION: INSTALL CORRECTIVE SERVICE FOR APAR/PTF      *
  ****************************************************************
  When the following conditions are met, an unexpected error
  occurs.
  - IMS HP Image Copy is scheduled in IMS Database Recovery
    Facility (DRF) of IMS Recovery Solution Pack or IMS Database
    Reorganization Exert (RGE) type-A.
  - Output image copy data set is not compressed
  - The record length of input DBDS is one byte shorter than a
     multiple of 8
  
  When IMS HP Image Copy is scheduled in DRF or RGE type-A, it
  defines the LRECL of output image copy data set to be a multiple
  of 8. IMS HP Image Copy sets the input DBDS records in the
  output buffer and then clears the rest of the output buffer
  area where no data is set. If the record length is one byte
  shorter than a multiple of 8, it must clear one byte. However,
  the clear logic is incorrect and clears a length of 256 bytes.
  As a result, the storage behind the buffer is overwritten with
  zeros, resulting in an unexpected error.
  

Problem conclusion

• After IMS HP Image Copy puts the record, it clears the unused
  area with the correct length.
  

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:

  UI80821

Modules/Macros

• FABJDPUT FABJDRQS
  

Fix information

• Fixed component name

  IMS HP IMAGE CO

• Fixed component ID

  5655K9600

Applicable component levels

• R420 PSY UI80821

     UP22/06/03 P F206

Fix is available

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