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DB2 - Problem description

Problem IC64255 Status: Closed

DB2 ABEND WHEN RUNNING OLAP QUERIES WITH "WITH HOLD" CURSORS
USING SCALAR AGGREGATE FUNCTIONS WHEN CC IS ENABLED.

product:
DB2 FOR LUW / DB2FORLUW / 910 - DB2
Problem description:
DB2 may abend with signal 11 when running OLAP queries with 
"WITH HOLD" 
cursors using scalar aggregate functions in an environment where 
Connection Concentrator is enabled. 
 
 
The entries in db2 diag may look as follows: 
 
2009-10-08-17.33.13.930178-420 I16330362A1659     LEVEL: Severe 
PID     : 729544               TID  : 1           PROC : 
db2agent (SAMPLE) 0 
INSTANCE: db2inst1             NODE : 000         DB   : SAMPLE 
APPHDL  : 0-000                APPID: 
FUNCTION: DB2 UDB, SQO Memory Management, sqlofmblkEx, probe:20 
MESSAGE : Memory corruption detected. 
DATA #1 : ZRC, PD_TYPE_PARAM_ZRC, 4 bytes 
0x820F0002 
DATA #2 : Corrupt block address, PD_TYPE_CORRUPT_BLK_PTR, 8 
bytes 
0x00000001118145e0 
DATA #3 : Block header, PD_TYPE_BLK_HEADER, 16 bytes 
0x00000001118145D0 : 0000 0000 0000 0000 0000 0000 0000 0000 
................ 
DATA #4 : Data header, PD_TYPE_BLK_DATA_HEAD, 48 bytes 
0x00000001118145E0 : 0000 0000 0000 0000 0000 0000 0000 0000 
................ 
0x00000001118145F0 : 0000 0000 0000 0000 0000 0000 0000 0000 
................ 
0x0000000111814600 : 0000 0000 0000 0000 0000 0000 0000 0000 
................ 
CALLSTCK: 
  [0] 0x0900000011086C74 pdLog + 0xA4 
  [1] 0x090000001124065C sqlofmblkEx + 0x5D0 
  [2] 0x090000001145EB88 
sqlri_scalag_close__FP8sqlrr_cbP15sqlri_scalagobj + 0x36C 
  [3] 0x0900000011410688 sqlri_scalag__FP8sqlrr_cb + 0x32C 
  [4] 0x090000001143DC8C 
sqlriSectInvoke__FP8sqlrr_cbP12sqlri_opparm + 0x18 
  [5] 0x090000001143CC98 sqlrr_process_fetch_request__FP7UCintfc 
+ 0xC 
  [6] 0x090000001143B3E0 
sqlrr_fetch__FP7UCintfcP15db2UCCursorInfo + 0x19C 
  [7] 0x0900000011115E50 
sqljs_ddm_cntqry__FP7UCintfcP14sqljsDDMObject + 0x82C 
  [8] 0x09000000111165BC 
sqljsParseRdbAccessed__FP13sqljsDrdaAsCbP14sqljsDDMObjectP7UCint 
fc + 0x2C 
  [9] 0x090000001113DF44 sqljsParse__FP13sqljsDrdaAsCbP7UCintfc 
+ 0xFFFFFFFFFFFFFF20 
 
 
 
2009-10-08-17.33.14.067268-420 E16337693A737      LEVEL: Severe 
PID     : 729544               TID  : 1           PROC : 
db2agent (SAMPLE) 0 
INSTANCE: db2inst1             NODE : 000         DB   : SAMPLE 
APPHDL  : 0-000                APPID: 
FUNCTION: DB2 UDB, oper system services, sqloEDUCodeTrapHandler, 
probe:20 
DATA #1 : Signal Number Recieved, 4 bytes 
11 
DATA #2 : Siginfo, 64 bytes 
0x0FFFFFFFFFFF7500 : 0000 000B 0000 0000 0000 0033 0000 0000 
...........3.... 
0x0FFFFFFFFFFF7510 : 0000 0000 0000 0000 0000 0000 0000 0000 
................ 
0x0FFFFFFFFFFF7520 : 0000 0000 0000 0000 0000 0000 0000 0000 
................ 
0x0FFFFFFFFFFF7530 : 0000 0000 0000 0000 0000 0000 0000 0000 
................ 
 
 
 
2009-10-08-17.33.19.535857-420 E16458189A881      LEVEL: Severe 
PID     : 2130026              TID  : 1           PROC : db2gds 
0 
INSTANCE: db2inst1             NODE : 000 
FUNCTION: DB2 UDB, oper system services, sqloEDUSIGCHLDHandler, 
probe:50 
DATA #1 : <preformatted> 
Detected the death of an EDU with process id 729544 
The signal number that terminated this process was 11 
Look for trap files (t729544.*) in the dump directory 
CALLSTCK: 
  [0] 0x0900000011719AF0 pdLogPrintf + 0xB8 
  [1] 0x09000000113E8490 
@38@sqloEDUSIGCHLDHandler__FiP9siginfo_tPv + 0x35C 
  [2] 0x0000000000000000 ?unknown + 0x0 
  [3] 0x0000000000000000 ?unknown + 0x0 
  [4] 0x0000000000000000 ?unknown + 0x0 
  [5] 0x0000000000000000 ?unknown + 0x0 
  [6] 0x0000000000000000 ?unknown + 0x0 
  [7] 0x0000000000000000 ?unknown + 0x0 
  [8] 0x0000000000000000 ?unknown + 0x0 
  [9] 0x0000000000000000 ?unknown + 0x0 
 
 
 
The fix is to return -901 error instead of db2 abend and output 
the following message in db2diag.log: 
 
2009-10-30-13.01.41.033538-240 I2554A836          LEVEL: Severe 
PID     : 205518               TID  : 1           PROC : 
db2agent (SAMPLE) 
INSTANCE: db2inst1                NODE : 000         DB   : 
SAMPLE 
APPHDL  : 0-7                  APPID: *LOCAL.elena.091030170039 
AUTHID  : db2inst1 
FUNCTION: DB2 UDB, trace services, sqlt_logerr_data, probe:0 
DATA #1 : SQLCA, PD_DB2_TYPE_SQLCA, 136 bytes 
 sqlcaid : SQLCA     sqlcabc: 136   sqlcode: -901   sqlerrml: 70 
 sqlerrmc: sqlricjpInfrequent: do not use Connection 
Concentrator and OLAP functions 
 sqlerrp : SQLRI462 
 sqlerrd : (1) 0x00000000      (2) 0x00000000      (3) 
0x00000000 
           (4) 0x00000000      (5) 0xFFFFEC11      (6) 
0x00000000 
 sqlwarn : (1)      (2)      (3)      (4)        (5)       (6) 
           (7)      (8)      (9)      (10)        (11) 
 sqlstate:
Problem Summary:
DB2 ABEND WHEN RUNNING OLAP QUERIES WITH "WITH HOLD" CURSORS 
USING SCALAR AGGREGATE FUNCTIONS WHEN CC IS ENABLED.
Local Fix:
1. Disable Connection Concentrator: 
 
db2 update dbm cfg using MAX_CONNECTIONS -1 
db2start 
db2stop 
 
2. Do not use WITH HOLD cursors.
available fix packs:
DB2 Version 9.1 Fix Pack 9  for Linux, UNIX and Windows
 DB2 Version 9.1 Fix Pack 10  for Linux, UNIX and Windows
 DB2 Version 9.1 Fix Pack 11  for Linux, UNIX and Windows
 DB2 Version 9.1 Fix Pack 12  for Linux, UNIX and Windows
Solution
FIRST FIXED in DB2 v91fp9 
 
LOCAL FIX: 
1. Disable Connection Concentrator: 
 
db2 update dbm cfg using MAX_CONNECTIONS -1 
db2start 
db2stop 
 
2. Do not use WITH HOLD cursors.
Workaround
not known / see Local fix
Timestamps
Date  - problem reported    :
Date  - problem closed      :
Date  - last modified       :

30.10.2009
19.04.2010
19.04.2010
Problem solved at the following versions (IBM BugInfos)
9.1.FP9
Problem solved according to the fixlist(s) of the following version(s)
9.1.0.9 FixList