PM20489: ABEND0C4 IN DSNLMTOK WHEN IT IS CALLED BY DSN3CT80. THE HIGH ORDER HALF OF R13 IS NONZERO.

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• ABEND0C4 at DSNLMTOK+4 while in 64 bit mode. The program check
  happens while DSNLMTOK is attempting to save registers into the
  savearea R13 points to. The high order word of R13 is nonzero.
  The resulting 64 bit address is invalid. The bytes in the high
  order word of R13 are the same as seen on entry to DB2.
  AMODE64 OFFSET4
  Additional Symptom(s) Search Keyword(s):
  After upgrading DB2 to Version 9, your CICS region receives an
  an AD2R abend within CICS and the DB2 thread terminates.
  The CICS exception trace entry looks like:
  AP 319D D2EX1 *EXC* THREAD TCB HAS ABENDED WITH ABEND
  000000C4,REASON,0003EB60
  .
  The reason code is not a valid DB2 reason code.
  Prior to this, within the CICS trace entries, you see:
  AP 3180 D2EX1 ENTRY APPLICATION  REQUEST EXEC SQL UNKNOWN
  .
  If a system dump is captured for the ABENDAD2R, the kernel
  error table will show an ABEND0C4 followed by transaction
  abend percolates.
  ERROR TYPE            ERR_CODE  MODULE    OFFSET
  PROGRAM_CHECK         0C4/AKEA  UNKNOWN   UNKNOWN
  TRAN_ABEND_PERCOLATE  ---/AD2R  DFHPCP    00000604
  TRAN_ABEND_PERCOLATE  ---/AD2R  DFHD2EX1  00002CDC
  TRAN_ABEND_PERCOLATE  ---/AD2R  DFHERM    0000137E
  The PSW of this abend0C4-38 points into module DSNLMTOK +4
  to a StoreMultiple (EBEC D008 0024 STMG  R14,R12,8(R13)  ).
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All DB2 users.                               *
  ****************************************************************
  * PROBLEM DESCRIPTION: An ABEND0C4 may occur in module         *
  *                      DSNLMTOK when it is called by DSN3CT80  *
  *                      during distributed thread termination.  *
  *                      DSNLMTOK is running in 64 bit mode, but *
  *                      DSN3CT80 passed a register 13 with      *
  *                      invalid data in the high half of the    *
  *                      register.  DSNLMTOK abended when it     *
  *                      attempted to save registers using the   *
  *                      invalid 64 bit register 13.             *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  DSN3CT80 should clear the high half of register 13 before
  switching to 64 bit mode and calling DSNLMTOK.
  

Problem conclusion

• Module DSN3CT80 has been modified to ensure that register 13 is
  a valid 64 bit register before calling DSNLMTOK.
  

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:

  UK60422

Modules/Macros

• DSN3CT80
  

Fix information

• Fixed component name

  DB2 OS/390 & Z/

• Fixed component ID

  5740XYR00

Applicable component levels

• R910 PSY UK60422

     UP10/09/29 P F009

Fix is available

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