DB2 FOR LUW / DB2FORLUW / 970 - DB2

When we have CPU_PARALLELISM  set to a value greater than 27 
explicitly or implicitly, the instance might crash with a 
possible memory corruption detected message in db2diag.log when 
performing a cursor load. 
 
db2diag.log will have entries similar to the following 
2014-09-17-04.00.01.948960-240 I20911E529          LEVEL: 
Warning 
PID     : 2710744              TID  : 140334889690880PROC : 
db2sysc 
INSTANCE: db2inst1             NODE : 000          DB   : TESTDB 
APPHDL  : 0-83                 APPID: 
*LOCAL.db2inst1.140917075957 
AUTHID  : db2inst1 
EDUID   : 198                  EDUNAME: db2lrid 
FUNCTION: DB2 UDB, database utilities, sqlulPrintPhaseMsg, 
probe:314 
DATA #1 : String, 100 bytes 
LOADID: 16.2014-09-17-03.59.38.013429.0 (3;4) 
Completed BUILD phase at 17-09-2014 04:00:01.948908. 
 
2014-09-17-04.00.02.049135-240 I21441E1776         LEVEL: Severe 
PID     : 2710744              TID  : 140334889690880PROC : 
db2sysc 
INSTANCE: db2inst1             NODE : 000          DB   : TESTDB 
APPHDL  : 0-83                 APPID: 
*LOCAL.db2inst1.140917075957 
AUTHID  : db2inst1 
EDUID   : 198                  EDUNAME: db2lrid 
FUNCTION: DB2 UDB, SQO Memory Management, 
sqloDiagnoseFreeBlockFailure, probe:10 
MESSAGE : Possible memory corruption detected. 
DATA #1 : ZRC, PD_TYPE_ZRC, 4 bytes 
0x820F0002 
DATA #2 : Corrupt block address, PD_TYPE_CORRUPT_BLK_PTR, 8 
bytes 
0x00007fa30221f220 
DATA #3 : Block header, PD_TYPE_BLK_HEADER, 24 bytes 
0x00007FA30221F208 : E0AF 0200 817F 0000 0000 001D 5D0A 8610 
............]... 
0x00007FA30221F218 : 1022 30FA 0100 802C 
."0...., 
DATA #4 : Data header, PD_TYPE_BLK_DATA_HEAD, 48 bytes 
0x00007FA30221F220 : 0000 0000 0000 0300 0000 0000 0000 0000 
................ 
0x00007FA30221F230 : 0000 0000 0000 0000 0000 0000 0000 0000 
................ 
0x00007FA30221F240 : 0000 0100 0400 0200 C0FE 6501 A37F 0000 
..........e..... 
CALLSTCK: 
  [0] 0x00007FA4B7B82F52 pdLog + 0x398 
  [1] 0x00007FA4B9667FDC 
/home/db2inst1/sqllib/lib64/libdb2e.so.1 + 0x2823FDC 
  [2] 0x00007FA4BA3AA5F3 sqlofmblkEx + 0x8F3 
  [3] 0x00007FA4B9EDB308 
/home/db2inst1/sqllib/lib64/libdb2e.so.1 + 0x3097308 
  [4] 0x00007FA4B9EDB4A5 
/home/db2inst1/sqllib/lib64/libdb2e.so.1 + 0x30974A5 
  [5] 0x00007FA4B9EDBB39 _Z19sqluDMSortTerminatePPh + 0xD7 
  [6] 0x00007FA4B9EA6E32 
_Z21sqluTerminateLoadSortP13SQLUCACB_TYPEP18SQU_EDU_ESSENTIALS + 
0x84 
  [7] 0x00007FA4B9ED40F7 
/home/db2inst1/sqllib/lib64/libdb2e.so.1 + 0x30900F7 
  [8] 0x00007FA4B9ED3D4B _ZN11sqluCRidder8iCleanUpEi + 0x145 
  [9] 0x00007FA4B9ED742B _Z17sqluLoadEDUDriverPhj + 0x36F 
 
This APAR will resolve the above observed issue.

**************************************************************** 
* USERS AFFECTED:                                              * 
* All users                                                    * 
**************************************************************** 
* PROBLEM DESCRIPTION:                                         * 
* See Error Description                                        * 
**************************************************************** 
* RECOMMENDATION:                                              * 
* Upgrade to DB2 for LUW Version 9.7 FixPack 11 or higher.     * 
****************************************************************

set CPU_PARALLELISM to a value lower than 27.

Firstly fixed in DB2 for LUW Version 9.7 FixPack 11.

not known / see Local fix

Date  - problem reported    :
Date  - problem closed      :
Date  - last modified       :

24.09.2014
13.10.2015
13.10.2015

9.7.FP11