PK72699: ABEND0C4 IN DFHKERPC IN THE AFTERMATH OF AN ABEND04E OF A DB2 THREAD TCB.

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• Abend0C4 in DFHKERPC following an abend04E.  Another symptom
  shows up in a dump taken while control of a task is in DB2
  processing an SQL call.   The last 2 lines of the kernel stack
  for that task look like this:
  00EE 2ADD8568 0DC0 Lifo 2B0F4028 AB0F733E 3316       DFHD2EX1
  00EE 2ADD9328 FFFF Lifo 2B0F4028 AA3FABD0 0000 *YES* DFHD2EX1
  .
  That last line is DFHD2D2's stack.  It formats out wrong because
  the 1st word of the stack is FFFFFFFF.
  .
  DB2 APAR PK51008 changes DSNAPRH to store the high half of R6
  in the 1st word pointed to by R13.  When CICS calls DSNAPRH,
  R13 is pointing to DFHD2D2's Kernel stack.  That is how the
  1st word of D2D2's Kernel stack gets overlayed with FFFFFFFF,
  since the high half of R6 was FFFFFFFF.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All                                          *
  ****************************************************************
  * PROBLEM DESCRIPTION: Abend0C4 in CICS following an abend in  *
  *                      DB2.                                    *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  After application of the PTF of DB2 APAR PK51008 (either UK30697
  or UK30698) DB2 may use the first halfword of storage pointed to
  by R13 after DSNAPRH has been called by CICS. In the event of an
  abend, any value placed in the halfword by DB2 may cause an
  abend0C4 in DFHKERPC or CICS to hang.
  Keywords: 0C4 04E
  

Problem conclusion

• DFHD2D2, DFHD2CO and DFHD2EX1 have been changed to point R13 at
  a 144 byte save area in each module's automatic storage before
  each call to DSNAPRH. On return from DB2, R13 is restored.
  

Temporary fix

• FIX AVAILABLE BY PTF ONLY
  

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

  PK66630

• APAR is sysrouted TO one or more of the following:

  UK40516 UK40517

Modules/Macros

•    DESD2CO  DESD2D2  DESD2EX1 DFHD2CO  DFHD2D2
  DFHD2EX1
  

Fix information

• Fixed component name

  CICSTS V3 Z/OS

• Fixed component ID

  5655M1500

Applicable component levels

• R400 PSY UK40516

     UP08/10/14 P F810

• R500 PSY UK40517

     UP08/10/14 P F810

Fix is available

• Select the PTF appropriate for your component level. You will be required to sign in. Distribution on physical media is not available in all countries.