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DB2 - Problembeschreibung

Problem IC73583 Status: Geschlossen

INSTANCE PANICS DUE TO "SQLBPRINTMAP(): NEW MAP IS NULL" DURING
REBALANCE TRIGGERED BY CRASH RECOVERY

Produkt:
DB2 FOR LUW / DB2FORLUW / 970 - DB2
Problembeschreibung:
If the rebalancer moves tablespace containers from one storage 
group to another and crashes before committing the rebalance 
changes, then during the subsequent crash recovery the 
rebalancer will not be able to find the path to the old 
tablespace containers. This will result in a database panic 
(abend), i.e. crash recovery will be unable to complete, 
therefore it will not be possible to connect to the database. 
 
This issue is timing sensitive - the initial rebalance must fail 
at a very precise point - which is difficult to hit in a real 
life scenario. The following data was gathered on a system where 
this problem was simulated: 
 
db2diag.log 
=========== 
2010-11-10-17.02.46.808455-480 I3768037E683          LEVEL: 
Severe 
PID     : 4675                 TID  : 47865472739648 KTID : 5383 
PROC    : db2sysc 
INSTANCE: db2inst1             NODE : 000 
EDUID   : 35                   EDUNAME: db2rebal (SAMPLE) 
FUNCTION: DB2 UDB, buffer pool services, sqlbDMSOpenContainer, 
probe:20 
MESSAGE : ZRC=0x870F0011=-2029060079=SQLO_PATH "an invalid path" 
          DIA8514C An invalid file path, "", was specified. 
DATA #1 : String, 66 bytes 
/u/db2inst1/db2inst1/SAMPLE/NODE0000/T0000007/C0000000.LRG 
DATA #2 : Object control block, PD_TYPE_SQLB_OBJECT, 12 bytes 
Obj: {pool:7;obj:0;type:0} Parent={0;0} 
DATA #3 : unsigned integer, 4 bytes 
0 
 
2010-11-10-17.02.46.819668-480 I3768721E455          LEVEL: 
Severe 
PID     : 4675                 TID  : 47865472739648 KTID : 5383 
PROC    : db2sysc 
INSTANCE: db2inst1             NODE : 000 
EDUID   : 35                   EDUNAME: db2rebal (SAMPLE) 
FUNCTION: DB2 UDB, buffer pool services, 
SqlbFhdlTbl::getFileHandle, probe:10 
RETCODE : ZRC=0x870F0011=-2029060079=SQLO_PATH "an invalid path" 
          DIA8514C An invalid file path, "", was specified. 
 
2010-11-10-17.02.46.821831-480 I3769177E449          LEVEL: 
Error 
PID     : 4675                 TID  : 47865472739648 KTID : 5383 
PROC    : db2sysc 
INSTANCE: db2inst1             NODE : 000 
EDUID   : 35                   EDUNAME: db2rebal (SAMPLE) 
FUNCTION: DB2 UDB, buffer pool services, sqlbPostRebalanceWork, 
probe:40 
MESSAGE : ZRC=0x870F0011=-2029060079=SQLO_PATH "an invalid path" 
          DIA8514C An invalid file path, "", was specified. 
 
2010-11-10-17.02.46.823768-480 I3769627E443          LEVEL: 
Severe 
PID     : 4675                 TID  : 47865472739648 KTID : 5383 
PROC    : db2sysc 
INSTANCE: db2inst1             NODE : 000 
EDUID   : 35                   EDUNAME: db2rebal (SAMPLE) 
FUNCTION: DB2 UDB, buffer pool services, sqlb_rebalance, 
probe:50 
MESSAGE : ZRC=0x870F0011=-2029060079=SQLO_PATH "an invalid path" 
          DIA8514C An invalid file path, "", was specified. 
 
2010-11-10-17.02.46.827628-480 I3770566E645          LEVEL: 
Severe 
PID     : 4675                 TID  : 47865472739648 KTID : 5383 
PROC    : db2sysc 
INSTANCE: db2inst1             NODE : 000 
EDUID   : 35                   EDUNAME: db2rebal (SAMPLE) 
FUNCTION: DB2 UDB, buffer pool services, sqlb_rebalance, 
probe:50 
DATA #1 : String, 299 bytes 
Current Map: Map Error 
 
  Map entry size: 80 
  Map entries:    1 
  Map size:       1 
 
 Set   Range  Off  MaxExtent  MaxPage  StartStr  EndStr  Adj 
Conts 
 ----  -----  ---  ---------  -------  --------  ------  --- 
----- 
 [ 0]   [ 0]    0         27      895         0       6    0  4 
(1, 2, 3, 4) 
 
2010-11-10-17.02.46.829504-480 I3771212E377          LEVEL: 
Severe 
PID     : 4675                 TID  : 47865472739648 KTID : 5383 
PROC    : db2sysc 
INSTANCE: db2inst1             NODE : 000 
EDUID   : 35                   EDUNAME: db2rebal (SAMPLE) 
FUNCTION: DB2 UDB, buffer pool services, sqlb_rebalance, 
probe:50 
DATA #1 : String, 31 bytes 
sqlbPrintMap(): New map is NULL 
 
2010-11-10-17.02.46.831488-480 E3771590E843          LEVEL: 
Critical 
PID     : 4675                 TID  : 47865472739648 KTID : 5383 
PROC    : db2sysc 
INSTANCE: db2inst1             NODE : 000 
EDUID   : 35                   EDUNAME: db2rebal (SAMPLE) 
FUNCTION: DB2 UDB, RAS/PD component, pdStartFODC, probe:10 
MESSAGE : ADM14001C  An unexpected and critical error has 
occurred: "Panic". 
          The instance may have been shutdown as a result. 
"Automatic" FODC 
          (First Occurrence Data Capture) has been invoked and 
diagnostic 
          information has been recorded in directory 
 
"/u/db2inst1/sqllib/db2dump/FODC_Panic_2010-11-10-17.02.46.83139 
2/". 
          Please look in this directory for detailed evidence 
about what 
          happened and contact IBM support if necessary to 
diagnose the 
          problem.
Problem-Zusammenfassung:
**************************************************************** 
* USERS AFFECTED:                                              * 
* See APAR text.                                               * 
**************************************************************** 
* PROBLEM DESCRIPTION:                                         * 
* See APAR text.                                               * 
**************************************************************** 
* RECOMMENDATION:                                              * 
* Upgrade to DB2 UDB 9.7 FixPak 4.                             * 
****************************************************************
Local-Fix:
verfügbare FixPacks:
DB2 Version 9.7 Fix Pack 4 for Linux, UNIX, and Windows
DB2 Version 9.7 Fix Pack 5 for Linux, UNIX, and Windows
DB2 Version 9.7 Fix Pack 6 for Linux, UNIX, and Windows
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

Lösung
See APAR text.
Workaround
keiner bekannt / siehe Local-Fix
Bug-Verfolgung
Vorgänger  : APAR is sysrouted TO one or more of the following: IC73649 
Nachfolger : 
Weitere Daten
Datum - Problem gemeldet    :
Datum - Problem geschlossen :
Datum - der letzten Änderung:
29.12.2010
28.04.2011
28.04.2011
Problem behoben ab folgender Versionen (IBM BugInfos)
9.7.
Problem behoben lt. FixList in der Version
9.7.0.4 FixList