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DB2 - Problem description

Problem IC73649 Status: Closed

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

product:
DB2 FOR LUW / DB2FORLUW / 950 - DB2
Problem description:
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 Summary:
**************************************************************** 
* USERS AFFECTED:                                              * 
* See APAR description                                         * 
**************************************************************** 
* PROBLEM DESCRIPTION:                                         * 
* See APAR description                                         * 
**************************************************************** 
* RECOMMENDATION:                                              * 
* Upgrade to DB2 UDB 9.5 FixPak 8                              * 
****************************************************************
Local Fix:
available fix packs:
DB2 Version 9.5 Fix Pack 8 for Linux, UNIX, and Windows
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
See APAR description
Workaround
not known / see Local fix
Timestamps
Date  - problem reported    :
Date  - problem closed      :
Date  - last modified       :
04.01.2011
27.06.2011
27.06.2011
Problem solved at the following versions (IBM BugInfos)
9.5.
Problem solved according to the fixlist(s) of the following version(s)
9.5.0.8 FixList
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