PM80948: ABEND0C4 RC3B FROM DSNWALCK OFFSET258C

APAR status

• Closed as program error.

Error description

• ABND=0C4-0000003B - LOC=DSNWAAP0.DSNWALCK+258C
  
  If the length of the caller's return area is exactly the same
  as the length of the response area, DSNWALCK will incorrectly
  assume that it don't fit. This will cause the ABEND0C4.
  

Local fix

• n/a
  

Problem summary

• ****************************************************************
  * USERS AFFECTED: All users of DB2 for z/OS 9 and 10.          *
  ****************************************************************
  * PROBLEM DESCRIPTION: 1. An IFI READS request causes ABEND0C4 *
  *                         in CSECT DSNWALCK.                   *
  *                                                              *
  *                      2. An invalid FROM CCSID may be used    *
  *                         when IFCID217 is written.            *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  1. If the size of the response area used for an IFI request is
  exactly the size of the return data, an incorrect pointer will
  be used by DB2 IFI code to update IFCA fields.  This will lead
  to an ABEND0C4 in CSECT DSNWALCK.
  
  2. When writing an IFCID217, DB2 may incorrectly determine the
  FROM CCSID to be used to convert the QW0217QA field to UTF.
  Dealing with an invalid CCSID, will cause a significant number
  of CPU cycles to be used by the conversion services.  This can
  lead to an increase of CPU cycles in the conversion services
  code.
  

Problem conclusion

• 1. Correct the logic error for updating IFCA fields  when
  the response data equals the return area size.
  
  2. Correctly determine the FROM CCSID when writing IFCID217
  

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:

  UK94119 UK94120

Modules/Macros

•    DSNTXSTB DSNWALCK
  

Fix information

• Fixed component name

  DB2 OS/390 & Z/

• Fixed component ID

  5740XYR00

Applicable component levels

• RA10 PSY

     UP

• R910 PSY

     UP