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: |
