DB2 FOR LUW / DB2FORLUW / 950 - DB2

The instance many trap after a restore of an existing database 
when a Roll Forward command is issued.  The Roll Forward command 
may include a check of the status of the Roll Forward as well as 
the actual command to start the Roll Forward.  The trap is due 
to a timing issue during the activation of different processes / 
threads. 
 
The the db2loggr process / thread will fail with a signal 11: 
 
2010-01-30-02.12.46.280761+060 E339182911E982     LEVEL: Severe 
PID     : 17712                TID  : 47238155786528  PROC : 
db2loggr (SAMPLE) 0 
INSTANCE: db2inst1             NODE : 000 
FUNCTION: DB2 UDB, oper system services, sqloEDUCodeTrapHandler, 
probe:20 
DATA #1 : Signal Number Recieved, 4 bytes 
11 
 
And will have the following stack: 
       sqlbInitEDU 
       sqlpgasn 
       sqloCreateEDU 
       sqloRunGDS 
       sqloInitEDUServices 
       sqloSystemControllerMain 
       sqloRunInstance 
       DB2main 
       main 
 
The problem is timing dependent, i.e. not always reproducible. 
The user can use a non-intrusive db2trc command to change the 
timing, thus work around the issue. In the same manner, db2trc 
can be used to reproduce the crash. Sample steps to recreate the 
crash: 
 
Setup: 
====== 
Create a database. Take an online backup while there is activity 
going on the database. 
 
session 1: db2 create db test 
session 1: db2 update db cfg for test using logretain yes 
session 1: db2 backup db test to /dev/null 
session 1: db2 backup db test online 
session 1: db2 connect to test 
session 1: db2 "create table t1 (c1 char(100))" 
session 1: db2 "insert into t1 values ('aaaaaaaaa')" 
session 1: while [ 1 ]; do db2 "insert into t1 select * from 
t1"; done 
session 2: db2 backup db test online 
session 1: Ctrl-C 
session 1: db2 terminate 
 
Reproduce: 
========== 
session 1: db2 restore db test 
session 1: db2trc on -crash "DB2.SQLP.sqlpgLoggrPostInit.entry" 
-suspend 
session 1: db2 rollforward db test (this step will hang) 
session 2: db2trc off              (in order to end the hang) 
session 1: (the session will resume, the output will be:) 
 
SQL1224N  The database manager is not able to accept new 
requests, has 
terminated all requests in progress, or has terminated your 
particular request 
due to a problem with your request.  SQLSTATE=55032

**************************************************************** 
* USERS AFFECTED:                                              * 
* Users performing a rollforward command.                      * 
**************************************************************** 
* PROBLEM DESCRIPTION:                                         * 
* The instance many trap after a restore of an                 * 
* existingdatabase when a Roll Forward command is issued.  The * 
* RollForward command may include a check of the status of     * 
* theRoll Forward as well as the actual command to start the   * 
* RollForward.  The trap is due to a timing issue during       * 
* theactivation of different processes /threads.The the        * 
* db2loggr process / thread will fail with a                   * 
* signal11:2010-01-30-02.12.46.280761+060 E339182911E982       * 
* LEVEL:SeverePID    : 17712                TID  :             * 
* 47238155786528  PROC :db2loggr (SAMPLE) 0INSTANCE: db2inst1  * 
*           NODE : 000FUNCTION: DB2 UDB, oper system           * 
* services,sqloEDUCodeTrapHandler, probe:20DATA #1 : Signal    * 
* Number Recieved, 4 bytes11And will have the following        * 
* stack:sqlbInitEDUsqlpgasnsqloCreateEDUsqloRunGDSsqloInitEDUSer 
**************************************************************** 
* RECOMMENDATION:                                              * 
* Upgrade to Version 9.5 Fix Pack 6 or later releasecontaining * 
* the fix.                                                     * 
****************************************************************

Despite the presence of the "-crash" option of db2trc, these 
steps will not cause any crash or other damage to the system. 
Instead, a certain code path will merely be put to sleep, and 
later resumed. 
 
session 1: db2 restore db test 
session 1: db2trc on -crash "DB2.SQLP.sqlpterm.entry" -suspend 
session 1: db2 rollforward db test (this step will hang) 
session 2: db2trc off              (in order to end the hang) 
session 1: (the session will resume, the output will be:) 
 
                                Rollforward Status 
 
Input database alias                   = test 
Number of nodes have returned status   = 1 
<..etc, the regular success message...>

DB2 Version 9.5 Fix Pack 6a for Linux, UNIX, and Windows
 DB2 Version 9.5 Fix Pack 7 for Linux, UNIX, and Windows
 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
 

Problem was first fixed in Version 9.5 Fix Pack 6.

See Local Fix.

Datum - Problem gemeldet    :
Datum - Problem geschlossen :
Datum - der letzten Änderung:

12.02.2010
25.05.2010
25.05.2010

9.5.FP6