PK57922: WHEN AN OUTPUT BUFFER OVERRUNS ITS LIMIT AND DESTROYS MEMORY ABEND 0C4 OR U385 MAY OCCUR

APAR status

• Closed as program error.

Error description

• When an output buffer overruns its limit and destroys memory
  abend 0c4 or u385 may occur.
  The culprit is a recovery block that is being filled with
  records from the input source.  The block is supposed to be
  flushed each time that it reaches capacity, but it does not
  flush under one specific condition.
  The block (DDRF) structure is 32768 (X'8000') and includes an
  imbedded buffer to hold the records.
     DDRF header info 76 bytes  (1st 2 bytes are HW length)
                   buffer 32692 bytes    (this is standard VB
  record format buffer)
  abendu385
  abendu0385
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: IMS Database Recovery Facility for z/OS      *
  *                 Version 3 Release 1                          *
  ****************************************************************
  * PROBLEM DESCRIPTION: Database recovery fails with change     *
  *                      accumulation input. Errors include:     *
  *                      S0C4 FRXRBUF0                           *
  *                      S0C4 FRXPSDR0                           *
  *                      U385-A FRXRBUF0                         *
  *                      CA detail records infrequently dropped  *
  *                      FRD4285I ERROR ENCOUNTERED              *
  ****************************************************************
  * RECOMMENDATION: INSTALL CORRECTIVE SERVICE FOR APAR/PTF      *
  ****************************************************************
  Change accumulation input records can cause overrun of
  output buffers resulting in various failures, either
  abending DRF or introducing pointer checker errors.
  The processing of VBS spanned records can result in
  lost data when conditional tests are made against
  unitialized data.
  

Problem conclusion

• AIDS: RIDS/UTIL RIDS/DBS DBS/UTIL
    GEN:
  
  *** END IMS KEYWORDS ***
  Constraints are now properly applied to ensure that
  output buffer limits are not exceeded.
  FRXRBUF0:
  Input buffer has been extended to accomodate 32760
  blksize.
  Output buffer size is restricted to 32760.
  Processing of VBS spanned records is corrected.
  FRXIVCN0, FRXIOCN0:
  Constraints are now set to prevent CA input from
  overlay of image copy records.
  

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:

  UK34976

Modules/Macros

• FRXIGIR  FRXIICA  FRXIOCN0 FRXIVCN0 FRXRBUF0
  

Fix information

• Fixed component name

  IMS DB RECOVERY

• Fixed component ID

  5655I4400

Applicable component levels

• R310 PSY UK34976

     UP08/04/15 P F804