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DB2 - Problem description

Problem IC77559 Status: Closed

INSERT OR UPDATE WITH INDEX COMPRESSION MAY CAUSE MEMORY CORRUPTION AND
CRASH

product:
DB2 FOR LUW / DB2FORLUW / 980 - DB2
Problem description:
If the indexes for a table are compressed then any of the 
following operations can cause a crash : 
 
- INSERT 
- UPDATE 
- IMPORT 
- LOAD 
- CREATE INDEX 
- REORG INDEXES 
 
The following are example stacktraces for the crash: 
 
<StackTrace> 
-------Frame------ ------Function + Offset------ 
sqloCrashOnCriticalMemoryValidationFailure + 0x20 
diagnoseMemoryCorruptionAndCrash__13SQLO_MEM_POOLFUlCPCc + 0x27C 
diagnoseMemoryCorruptionAndCrash__13SQLO_MEM_POOLFUlCPCc@glue7C4 
+x78 
MemTreeGet__13SQLO_MEM_POOLFCUlT1PPvPP17SqloChunkSubgroupPP12SMe 
mLostNode + 0x54 
 .allocateMemoryBlock.fdpr.clone.26__13SQLO_MEM_POOLFCUlUlT1UiT1 
PPvPP17SqloChunk 
SubgroupPP12SMemLostNodeCP12SMemLogEvent + 0x80 
sqlogmblkEx + 0x72C 
sqldAllocWorkArea__FP8sqeAgentP16SQLD_WORK_MEMORYUiiN23PPc + 
0x98 
sqldAllocWorkArea__FP8sqeAgentP16SQLD_WORK_MEMORYUiiN23PPc@glue5 
68 + 0x8C 
sqldGetWorkArea__FP8sqeAgentiPPcUiT2@glueC2A + 0x2C 
@147@sqlipcLogPrefixImprovement__FP7SQLI_CBP14SQLI_PAGE_DESCT2lP 
9SQLI_SLOT + 0x1FC 
@147@sqlipcCopyTempPgToCurrentPg__FP7SQLI_CBP14SQLI_PAGE_DESCP9S 
QLI_SLOTT2lP6ACT_PG + 0x270 
@147@sqlipcPhysicalMerge__FP7SQLI_CBP6ACT_PGP14SQLI_PAGE_DESCP27 
SQLI_PREFIX_META 
_DATA_TABLEUlN25lP9SQLI_SLOT  + 0x688 
sqlipcOptimizePrefixes__FP7SQLI_CBP6ACT_PGP14SQLI_PAGE_DESCP9SQL 
I_SLOTUlT5PUl + 0x62C 
sqlipcOptimizePrefixes__FP7SQLI_CBP6ACT_PGP14SQLI_PAGE_DESCP9SQL 
I_SLOTUlT5PUl@glue1500 + 0x74 
@147@addkeyToLeaf__FP7SQLI_CBP11SQLI_SAGLOBP9SQLI_SLOT + 0x814 
</StackTrace> 
 
 
<StackTrace> 
-------Frame------ ------Function + Offset------ 
?unknown + 0x0 
memcpy__FPvPCvUl + 0x2C 
sqlo_md_mcpy + 0x208 
sqlipcUseLongerPrefix__FP7SQLI_CBPcN32PUs +  0xFB4 
sqlipcPutNewSuffixOnTempPg__FP7SQLI_CBP14SQLI_PAGE_DESCT2lN24P21 
SQLI_PREFIX_META_DATA + 0x4F0 
sqlipcCopyModifiedSuffixesWithRelocate__FP7SQLI_CBP14SQLI_PAGE_D 
ESCT2P9SQLI_SLOTUl + 0x520 
sqlipcPhysicalMerge__FP7SQLI_CBP6ACT_PGP14SQLI_PAGE_DESCP27SQLI_ 
PREFIX_META_DATA_TABLEUlN25lP9SQLI_SLOT + 0x4D0 
sqlipcOptimizePrefixes__FP7SQLI_CBP6ACT_PGP14SQLI_PAGE_DESCP9SQL 
I_SLOTUlT5PUl + 0x4A0 
sqliNormalAddKey__FP7SQLI_CBP14SQLI_PAGE_DESCP9SQLI_SLOTP8SQLD_K 
 EYP12SQLI_KEYDATA + 0x4AC 
sqliakn__FP7SQLI_CBP14SQLI_PAGE_DESCP9SQLI_SLOTP8SQLD_KEYP12SQLI 
_KEYDATAPUc + 0x668 
addkeyToLeaf__FP7SQLI_CBP11SQLI_SAGLOBP9SQLI_SLOT + 0x2C8 
procLeaf2Add__FP7SQLI_CBP11SQLI_SAGLOBP9SQLI_SLOTiP12SQLI_KEYDAT 
A + 0x4D4 
sqlischa__FP7SQLI_CBP11SQLI_SAGLOBiUi + 0xFC4 
next_level__FP7SQLI_CBP11SQLI_SAGLOBiUi + 0x138 
sqlischa__FP7SQLI_CBP11SQLI_SAGLOBiUi + 0xF4C 
sqliaddk__FP8sqeAgentP9SQLD_IXCBP8SQLD_KEYP12SQLI_KEYDATAP14SQLP 
_LOCK_INFOP8SQLP 
_LRBUlP10SQLI_IXPCR + 0xF88 
sqldKeyInsert__FP13SQLD_DFM_WORKP16SQLD_TABLE_CACHET2P13SQLD_TDA 
TARECiUl + 0x7B4 
sqldRowInsert__FP8sqeAgentUsT2UcUliPP10SQLD_VALUEP13SQLD_TDATARE 
CP8SQLZ_RID + 0x1230 
sqlrinsr__FP8sqlrr_cbUsT2iT2PP10SQLD_VALUEUlP8SQLZ_RID + 0xE8 
sqlriisr__FP8sqlrr_cb + 0x4F0 
sqlriExecThread__FP8sqlrr_cbP12sqlri_opparm + 0x584 
sqlriSectInvoke__FP8sqlrr_cbP12sqlri_opparm + 0x4DC 
sqlrr_process_execute_request__FP8sqlrr_cbi + 0x1880 
sqlrr_execute__FP14db2UCinterfaceP9UCstpInfo + 0x5A4 
sqljs_ddm_excsqlstt__FP14db2UCinterfaceP13sqljDDMObject + 0x5D8 
sqljsParseRdbAccessed__FP13sqljsDrdaAsCbP13sqljDDMObjectP14db2UC 
interface + 0x1E0 
sqljsParse__FP13sqljsDrdaAsCbP14db2UCinterfaceP8sqeAgentb + 0x21 
C 
sqljsSqlam__FP14db2UCinterfaceP8sqeAgentb + 0x4AC 
 
sqljsDriveRequests__FP8sqeAgentP14db2UCconHandle + 0x15C 
sqljsDrdaAsInnerDriver__FP18SQLCC_INITSTRUCT_Tb + 0x478 
sqljsDrdaAsDriver__FP18SQLCC_INITSTRUCT_T +  0x23C 
RunEDU__8sqeAgentFv + 0x3AC 
EDUDriver__9sqzEDUObjFv + 0x19C 
sqlzRunEDU__FPcUi + 0x3C 
sqloEDUEntry + 0x6A4 
</StackTrace>
Problem Summary:
**************************************************************** 
* USERS AFFECTED:                                              * 
* ALL                                                          * 
**************************************************************** 
* PROBLEM DESCRIPTION:                                         * 
* See error description above                                  * 
**************************************************************** 
* RECOMMENDATION:                                              * 
* Upgrade to DB2 V9.8 FP4                                      * 
****************************************************************
Local Fix:
db2set DB2_INDEX_COMPRESSION=OFF 
followed by db2stop/db2start to pick up this change, 
then drop and recreate the indexes. 
 
Alternatively use the ALTER INDEX command with the COMPRESS NO, 
following by using the REORG INDEXES command to recreate the 
problem index as uncompressed
available fix packs:
DB2 Version 9.8 Fix Pack 4 for AIX and Linux
 DB2 Version 9.8 Fix Pack 5 for AIX and Linux
Solution
Problem first fixed in DB2 V9.8 FP4
Workaround
not known / see Local fix
Timestamps
Date  - problem reported    :
Date  - problem closed      :
Date  - last modified       :

15.07.2011
10.08.2011
10.08.2011
Problem solved at the following versions (IBM BugInfos)
9.8.FP4
Problem solved according to the fixlist(s) of the following version(s)
9.8.0.4 FixList