OA23675: MULTIPLE ABENDS IN ISTORCGB

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• Multiple abends due to the first byte of the two word GETBLK
  header being overlaid.
  
  IST931I SYMPTOM STRING = AB/S00C4 LVLS/618 RIDS/ISTAPCFR#R 134
  IST931I SYMPTOM STRING = PIDS/5695-11701 ADRS/0000083E
  RIDS/UNKNOWN
  IST931I SYMPTOM STRING = #L RIDS/ISTORCGB LVLS/05.236
  PTFS/HVT6180
  IST931I SYMPTOM STRING = REGS/0C81C PRCS/00000010 ASID/0060
  IST314I END
  FFST probe tripped on first occurrence:
  EPW0401I EPWFFST: EVENT DETECTED BY VTAM FOR PROBEID ISTORCZ1
  EPW0406I DUMP DATASET IS: SYSTEM DUMP DATA SET
  EPW0402I PRIMARY SYMPTOM STRING FOR PROBEID ISTORCZ1 FOLLOWS:
  EPW0404I PIDS/569511701 LVLS/180 PCSS/ISTORCZ1 RIDS/ISTORCGB
  EPW0404I PCSS/FULL OVS/ISTGBHDR
  EPW0701I END OF MESSAGE GROUP
  ------------------------------------------------------------
  Several hours before the ISTORCGB abend occurred, an 0C4 abend
  occurred in ISTORCFB due to the overlaid header. This APAR does
  not fix the cause of the overlay, it helps to prevent the
  repeated abends afterwards. In this particular case this is
  what the header looked like: 44000CF0 FFFFFFFF the '44' in
  the first byte was the overlay. The beginning of the overlay
  started three bytes before the GETBLK SMS header, but the last
  byte of the one word overlay ended up on the GETBLK HDR.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All                                          *
  ****************************************************************
  * PROBLEM DESCRIPTION: Multiple ABENDs due to the overlaid     *
  *                      first byte of the GETBLK header.        *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  This problem is described as follows:
  1. The first byte of the GETBLK header (GBHFBQE) was overlaid
     with X'44'.
  2. TSC issued a GETBLK request to obtain storage.
  3. ISTORCGB received control to process the GETBLK request,
     detected GBHFBQE in the GETBLK header overlaid with X'44',
     and issued FFST probe ISTORCZ1 to take a dump. It tried
     to fix the overlay using the whole word GBHFBQE as an offset
     to the next GETBLK header. This caused an ABEND0C4 because
     the address was invalid.
  

Problem conclusion

• ISTORCGB has been changed to assume that GBHFBQE in
  the GETBLK header has been overlaid if the value is
  greater than or equal to 65535.
  

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:

  UA39172 UA39173 UA39174

Modules/Macros

• ISTORCGB
  

Fix information

• Fixed component name

  VTAM V4 MVS/ESA

• Fixed component ID

  569511701

Applicable component levels

• R170 PSY UA39172

     UP08/03/04 P F803 Ž

• R180 PSY UA39173

     UP08/03/04 P F803 Ž

• R190 PSY UA39174

     UP08/03/04 P F803 Ž

Fix is available

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