PI27998: STORAGE OVERLAY OCCURRED AT XSLOT_FREECHAIN FOR CCBX FOR SSAM POOL CAUSING MULTIPLE ABEND0C4S

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• Storage overlay occurred at XSLOT_FREECHAIN for CCBX FOR SSAM.
  The corrupted free CCBX block is then successfully reallocated.
  Its corrupted forward pointer is moved to XSLOT_FREECHAIN and
  caused multiple ABEND0C4. The overlaid blocks are owned by
  DSN3AUCM.
  .
  Possible ABEND0C4s are ABEND0C4 RC00000004 or RC00000010 from
  DSNSVSFB OFFSET03DA
  
  Possible DSNL033I DSNLCINI DDF TERMINATION SCHEDULED DUE
  TO DETECTION OF ABEND 0C4 REASON 00000000
  and abend 0C4 is out of DSNQLINA or DSNLAGNX
  
  
  Additional keywords and symptoms:
  ********************************
  ABEND0C4 DSNLQINA OFFSET15CC
  ABEND0C4 DSNLAGNX OFFSET05AC
  

Local fix

• N/A
  

Problem summary

• ****************************************************************
  * USERS AFFECTED: All DB2 for z/OS V11 users.                  *
  ****************************************************************
  * PROBLEM DESCRIPTION: A storage overlay or ABEND0C4 may occur *
  *                      on a freed CCBX pool block.  The CCBX   *
  *                      had been in use but was freed when      *
  *                      the abend or overlay occurs.            *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  A storage overlay or ABEND0C4 may occur on a freed CCBX pool
  block.  The CCBX had been in use but was freed when the
  ABEND0C4 or storage overlay occurs.
  Module DSN3AUCN or DSNSVSFB may be executing when the
  ABEND0C4 or storage overlay occurs.
  DB2OVRLAY/K
  

Problem conclusion

• Module DSN3ID30 has been updated to verify that the CCBX pool
  block has been obtained.  Other DB2 modules have been updated to
  verify that the CCBX block is valid before trying to set end
  user client fields in the CCBX.
  

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:

  UI24047

Modules/Macros

•    DSNXERD  DSN3AUCM DSN3AUCN DSN3CT30 DSN3EOM0
  DSN3ID30 DSN3ID80 DSN3SI30 DSN3TM00
  

Fix information

• Fixed component name

  DB2 OS/390 & Z/

• Fixed component ID

  5740XYR00

Applicable component levels

• RB10 PSY UI24047

     UP15/01/08 P F501 Ž

Fix is available

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