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DB2 - Problem description

Problem IC78792 Status: Closed

DOUBLE FREE ERROR CAN OCCUR IN SQLPRECM WHEN SQLPALR_LOADUSERBUFFER REPORTS
"BUFFER IS TOO SMALL." MESSAGE.

product:
DB2 FOR LUW / DB2FORLUW / 950 - DB2
Problem description:
This problem is known to occur during dropped table rollforward 
recovery. 
A typical call stack may show : 
 
pdLog 
sqloDiagnoseFreeBlockFailure(SMemFBlk*) 
sqloDiagnoseFreeBlockFailure(SMemFBlk*) 
sqlofmblkEx 
sqlprecm(sqeAgent*,SQLP_LSN8*,SQLP_LSN8*,unsigned int,unsigned 
long) 
sqlprUndoPhaseTblSpace(sqeAgent*,SQLP_DBCB*,unsigned 
int*,SQLB_POOL_ID_LIST*,bool*,bool*) 
sqlpForwardRecoveryTblSpace(sqeAgent*,unsigned short,unsigned 
int,char*,int*,int*,int*,unsigned int*,SQLB_POOL_ID_LIST*,int) 
sqlpprfr(SQLP_PDB_RFW_SQP_RQST*,SQLP_RFW_RPLY*,sqeAgent*,SQLB_PO 
OL_ID_LIST*,int*,sqlca*) 
sqlpPdbRfwRouter(sqeAgent*) 
sqleSubRequestRouter(sqeAgent*,unsigned int*,unsigned int*) 
 
the db2diag.log would report the following 2 typical messages : 
 
FUNCTION: DB2 UDB, data protection services, 
sqlpALR_LoadUserBuffer, 
probe:350 
 
DATA #1 : <preformatted> 
 
Buffer is too small.  Update readStartLsn from 1D259B1C5D3F to 
1D259B1C5D3F 
 
and 
 
FUNCTION: DB2 UDB, SQO Memory Management, 
sqloDiagnoseFreeBlockFailure, 
probe:30 
 
DATA #1 : String, 12 bytes 
 
Double free.
Problem Summary:
An instance may abend during drop table rollforward recovery.
Local Fix:
no known workarounds
available fix packs:
DB2 Version 9.5 Fix Pack 9 for Linux, UNIX, and Windows
 DB2 Version 9.5 Fix Pack 10 for Linux, UNIX, and Windows
Solution
This problem has first been fixed in V9.5 Fix Pack 9
Workaround
not known / see Local fix
BUG-Tracking
forerunner  : APAR is sysrouted TO one or more of the following: IC79860 
follow-up :
Timestamps
Date  - problem reported    :
Date  - problem closed      :
Date  - last modified       :

20.09.2011
08.03.2012
08.03.2012
Problem solved at the following versions (IBM BugInfos)
9.5.FP9
Problem solved according to the fixlist(s) of the following version(s)
9.5.0.9 FixList