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DB2 - Problem description

Problem IC82489 Status: Closed

Within a very small timing window DB2 can panic and trap in
sqlbDecrementFixCountWithLatches.

product:
DB2 FOR LUW / DB2FORLUW / 970 - DB2
Problem description:
The following error messages will be generated in the 
db2diag.log before DB2 panics and comes down. 
 
2010-06-15-08.45.41.147072-300 I586896E1748       LEVEL: Severe 
PID     : 11111                TID  : 183035406528PROC : 
db2agntp 7 
INSTANCE: db2inst1             NODE : 007 
APPHDL  : 0-240                APPID: 
10.80.176.143.32476.10061511111 
AUTHID  : TEST 
FUNCTION: <0>, <0>, <195>, probe:222 
DATA #1 : String, 49 bytes 
sqlbDecrementFixCountWithLatches hashindx changed 
DATA #2 : Buffer page descriptor, PD_TYPE_SQLB_BPD, 152 bytes 
  Pagekey: {pool:3;obj:0;type:128} PPNum:1234 
  objectPageNum:                      1887 
  bucketGroupHashIndex:                 -2 
  hashnext:             0x0000000000000000 
  hashprev:             0x0000000000000000 
  osslatch: 
 
2010-06-15-08.45.41.382239-300 I588645E460        LEVEL: Severe 
PID     : 23228                TID  : 183035406528PROC : 
db2agntp 7 
INSTANCE: db2inst1             NODE : 007 
APPHDL  : 0-240                APPID: 
10.80.176.143.32476.10061511111 
AUTHID  : TEST 
FUNCTION: DB2 UDB, buffer pool services, sqlb_panic, probe:20 
RETCODE : ZRC=0x87020002=-2029912062=SQLB_BPSE "Debug logic 
error detected" 
          DIA8501C A buffer pool logic error has occurred. 
. 
. 
2010-06-15-08.45.51.198126-300 I688988E456        LEVEL: Severe 
PID     : 11111                TID  : 183035406528PROC : 
db2agntp 7 
INSTANCE: db2inst1             NODE : 007 
APPHDL  : 0-240                APPID: 
10.80.176.143.32476.10061511111 
AUTHID  : TEST 
FUNCTION: DB2 UDB, base sys utilities, sqle_panic, probe:10 
MESSAGE : sqle_panic: Panic/sleep = 
DATA #1 : Hexdump, 4 bytes 
0x00000002000101CC : 0000 0000 
.... 
. 
. 
2010-06-15-08.45.57.478074-300 E695237E601        LEVEL: Severe 
PID     : 11111                TID  : 183035406528PROC : 
db2agntp 7 
INSTANCE: db2inst1             NODE : 007 
APPHDL  : 0-240                APPID: 
10.80.176.143.32476.10061511111 
AUTHID  : TEST 
FUNCTION: DB2 UDB, oper system services, sqloEDUCodeTrapHandler, 
probe:10 
MESSAGE : ADM0503C  An unexpected internal processing error has 
occurred.  ALL 
          DB2 PROCESSES ASSOCIATED WITH THIS INSTANCE HAVE BEEN 
SHUTDOWN. 
          Diagnostic information has been recorded.  Contact IBM 
Support for 
          further assistance. 
 
Snippet of the stack that gets generated in the Trap file: 
 
0000002A96BAD05C _Z10sqle_panicv + 0x0034 
        (/opt/IBM/db2/V9.1/lib64/libdb2e.so.1) 
0000002A96A69F69 sqlb_panic + 0x0069 
        (/opt/IBM/db2/V9.1/lib64/libdb2e.so.1) 
0000002A963EC86B 
_Z32sqlbDecrementFixCountWithLatchesP8SQLB_BPDP12SQLB_GLOBALSP15 
SQLB_BufferPoolb 
+ 0x013b 
        (/opt/IBM/db2/V9.1/lib64/libdb2e.so.1) 
0000002A980871E9 _Z7sqlbfixP11SQLB_FIX_CB + 0x1591 
        (/opt/IBM/db2/V9.1/lib64/libdb2e.so.1) 
0000002A9809E878 address: 0x0000002A9809E878 ; dladdress: 
0x0000002A956B3000 ; offset in lib: 0x00000000029EB878 ; 
        (/opt/IBM/db2/V9.1/lib64/libdb2e.so.1) 
0000002A9809D4E5 _Z7sqldfrdP13SQLD_DFM_WORK + 0x00d5 
        (/opt/IBM/db2/V9.1/lib64/libdb2e.so.1) 
0000002A980FFA47 
_Z12sqlsmergerecP20sqle_agent_privatecbP10SQLS_SLDESP10SQLS_MBUF 
Sm 
+ 0x00d7 
        (/opt/IBM/db2/V9.1/lib64/libdb2e.so.1) 
0000002A980FAF8F 
_Z8sqlsfetcP20sqle_agent_privatecbP8SQLD_CCBiP10SQLD_DPREDPP10SQ 
LD_VALUEP8SQLZ_RIDPc 
+ 0x02d7 
        (/opt/IBM/db2/V9.1/lib64/libdb2e.so.1) 
0000002A980E0215 _Z10sqlriFetchP8sqlrr_cbP9sqlri_taol + 0x0095 
        (/opt/IBM/db2/V9.1/lib64/libdb2e.so.1) 
0000002A980ECE0A _Z7sqlritaP8sqlrr_cb + 0x00ca
Problem Summary:
**************************************************************** 
* USERS AFFECTED:                                              * 
* See Error Description                                        * 
**************************************************************** 
* PROBLEM DESCRIPTION:                                         * 
* See Error Description                                        * 
**************************************************************** 
* RECOMMENDATION:                                              * 
* Upgrade to DB2 for Linux, UNIX, Windows version 9.7 Fix Pack * 
* 7                                                            * 
****************************************************************
Local Fix:
available fix packs:
DB2 Version 9.7 Fix Pack 7 for Linux, UNIX, and Windows
DB2 Version 9.7 Fix Pack 8 for Linux, UNIX, and Windows
DB2 Version 9.7 Fix Pack 9 for Linux, UNIX, and Windows
DB2 Version 9.7 Fix Pack 9a for Linux, UNIX, and Windows
DB2 Version 9.7 Fix Pack 10 for Linux, UNIX, and Windows

Solution
Problem first fixed in DB2 for Linux, UNIX, Windows version 9.7 
Fix Pack 7
Workaround
not known / see Local fix
Timestamps
Date  - problem reported    :
Date  - problem closed      :
Date  - last modified       :
03.04.2012
26.10.2012
26.10.2012
Problem solved at the following versions (IBM BugInfos)
9.7.,
9.7.FP*
Problem solved according to the fixlist(s) of the following version(s)
9.7.0.7 FixList