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DB2 - Problembeschreibung

Problem IT00810 Status: Geschlossen

THE DB2 INSTANCE MAY HANG OR TRAP ON LINUX WHEN USING A HIGH NUMDB SETTING

Produkt:
DB2 FOR LUW / DB2FORLUW / A10 - DB2
Problembeschreibung:
Using a high NUMDB setting (~100 or higher) may result 
in a hang or trap on DB2 / Linux.  The high setting results in 
the creation of an additional segment for the DBMS memory set 
during instance startup processing (db2start).  The address 
space assigned to the new segment for the db2sysc process at 
this point in time may not be available in the db2wdog 
(watchdog) process.  The watchdog may not then be able to 
function properly, resulting in unpredictable symptoms, 
including errors related to managing FMP processes. 
 
The db2ckpwd process handling authentication may also be 
impacted.  It may trap in sqltinit , resulting in hangs when 
attempting to connect to a database (or attach to an instance) 
with authentication. 
 
This problem may be more common in environments using address 
space layout randomization (ASLR). 
 
To confirm vulnerability, check "db2pd -memsets" whether a new 
segment is created immediately after db2start.  This record 
beginning with "Seg0" directly below the "DBMS" record indicates 
a new segment was added. 
 
Memory Sets: 
Name         Address            Id 
DBMS         0x0000000200000000 1314979889 
  Seg0       0x00002AAACD72A000 1315045427
Problem-Zusammenfassung:
**************************************************************** 
* USERS AFFECTED:                                              * 
* DB2/Linux systems with a high NUMDB setting                  * 
**************************************************************** 
* PROBLEM DESCRIPTION:                                         * 
* See Error Description                                        * 
**************************************************************** 
* RECOMMENDATION:                                              * 
* Upgrade to DB2 Version 10.1 Fix Pack 5                       * 
****************************************************************
Local-Fix:
Avoid unnecessarily large settings for the NUMDB database 
manager configuration parameter
Lösung
Problem first fixed in DB2 Version 10.1 Fix Pack 5
Workaround
see Local Fix
Weitere Daten
Datum - Problem gemeldet    :
Datum - Problem geschlossen :
Datum - der letzten Änderung:
03.04.2014
16.07.2015
16.07.2015
Problem behoben ab folgender Versionen (IBM BugInfos)
Problem behoben lt. FixList in der Version
10.1.0.5 FixList