I have added the complete job log listing from where the problem starts. As recommended by Chuck:
All the "to" vars (procedure, module etc.) apparently point to stuff in the OS itself.
The system is on V6R1M0. As for PTF:s (since I do not manage PTF:s) the question is which product to look for.
A full version of the log messages follow. Interestingly there is no telling what reason code "6" is - despite the logging level is *seclvl.
The sequence below then repeats over and over again for over 90 thousand pages.
Anyhow this is a full version of where the messages start:
---------------------
CPF8361    Escape                  40   11-12-30  04:11:26,524933  QTNCMTSP     QSYS        *STMT    QRWSARDB    QSYS 
                                      From module . . . . . . . . :   QTNCRDSP                                         
                                      From procedure  . . . . . . :   SNDMSG                                           
                                      Statement . . . . . . . . . :   17178                                            
                                      To module . . . . . . . . . :   QRWSARDB                                         
                                      To procedure  . . . . . . . :   REGLCLRSC                                        
                                      Statement . . . . . . . . . :   9895                                             
                                      Message . . . . :   Cannot place resource under commitment control. Reason       
                                        code 6.                                                                        
                                      Cause . . . . . :   An attempt was made to place a resource under commitment     
                                        control for commitment definition *DFTACTGRP that was not valid. Reason code   
                                        is 6 -- One of the following limits was exceeded: system storage, user         
                                        profile storage limit for user profile QDBSHR, no more than 2,097,143 unique   
                                        commitment definition/journal combinations on the system, or the maximum       
                                        resources for the commitment definition exceeded.       Recovery  . . . :      
                                        Depending on which limit was exceeded, do one of the following: (1) Free       
                                        some storage STG(*FREE) parameter on the SAVOBJ command.  (2) Assign storage   
                                        to user profile QDBSHR using the MAXSTG parameter on the CHGUSRPRF command.    
                                        (3) Have fewer than 2,097,143 unique commitment definitions/journal
                                                   combinations on the system.  (4) Remove some resources from commitment               
                                       control.     Technical description . . . . . . . . :   The commitment                
 5761SS1 V6R1M0 080215                           Job Log                             ED9EM05A 11-12-30 04:11:32          Pag
  Job name . . . . . . . . . . :   M01_NDC         User  . . . . . . :   REXNDC       Number . . . . . . . . . . . :   85545
  Job description  . . . . . . :   REXBATCH        Library . . . . . :   REXNDCSHR    Section number . . . . . . . :   0007 
MSGID      TYPE                    SEV  DATE      TIME             FROM PGM     LIBRARY     INST     TO PGM      LIBRARY    
                                       definition identifier is X'5CC4C6E3C1C3E3C7D9D7'. The activation group               
                                       number is X'00000002'. The lock space id is UDB_01000000001A5E1D. The lock           
                                       space associated space id is 1. The XID is                                           
                                       X'00000000000000000000000000000000000000000000000000000000000000000000000000         
                                       0000000000000000000000000000000000000000000000000000000000000000000000000000         
                                       0000000000000000000000000000000000000000000000000000000000000000000000000000         
                                       000000000000000000000000000000000000000000000000000000'.                             
SQL0752    Diagnostic              30   11-12-30  04:11:26,525147  QSQCONN      QSYS        *STMT    QSQCONN     QSYS       
                                     From module . . . . . . . . :   QSQCONN                                                
                                     From procedure  . . . . . . :   CLEANUP                                                
                                     Statement . . . . . . . . . :   21002                                                  
                                     To module . . . . . . . . . :   QSQCONN                                                
                                     To procedure  . . . . . . . :   CLEANUP                                                
                                     Statement . . . . . . . . . :   21002                                           
                                     Message . . . . :   Connection cannot be changed. Reason code is 0.             
                                     Cause . . . . . :   Connection cannot be made because the application process   
                                       is not in a connectable state. The reason code is 0. Reason codes and their   
                                       meanings are: 1 -- SQL is not in a connectable state. SQL enters the          
                                       connectable state after a COMMIT or ROLLBACK. SQL leaves the connectable      
                                       state when any SQL statement except a COMMIT, ROLLBACK, or CONNECT statement  
                                       is run. 2 -- There are pending changes or open files under commitment         
                                       control at the current server and the relational database (RDB) specified on  
                                       the CONNECT request is not the current server. 3 -- A create SQL package      
                                       request is being processed when not on a commit boundary. 4 -- The            
                                       connection is locked by another invocation of Interactive SQL, or there is a  
                                       level mismatch between the Interactive SQL product and DB2 for i5/OS. 5 --    
                                       The connection cannot be changed due to restrictions with remote connections  
                                       and the job level commitment definition. 6 -- The connection cannot be        
                                       changed to a remote system due to a SET TRANSACTION statement. 7 -- The       
                                       connection cannot be changed using *RUW connection management because a       
                                       previous connection is protected. 8 -- CONNECT RESET cannot start a local     
                                       connection to RDB ED9EM05A because the RDB for the auxiliary storage pool     
                                       (ASP) group of the thread is ED9EM05A. 9 -- There is a mismatch between the      
                                       active connection and the current ASP group of the thread. Recovery  . . . :     
                                         Do one of the following based on the reason code: 1 -- Issue a COMMIT or       
                                       ROLLBACK statement to enter the connectable state. 2 -- Close all files open     
                                       under commitment control and issue a COMMIT or ROLLBACK statement. 3 --          
                                       Issue a COMMIT or ROLLBACK statement. 4 -- Exit Interactive SQL and try the      
                                       request again. If Interactive SQL is active, the current server can only be      
                                       changed using Interactive SQL. 5 -- All activation groups associated with        
                                       the job level commitment definition must be local; or only one remote            
                                       connection and no local connections can be associated with the job level         
                                       commitment definition. 6 -- Issue a COMMIT or ROLLBACK statement. 7 --           
                                       Release the protected conversation followed by a COMMIT. 8 -- Change the ASP     
                                       group of the thread to the ASP group for relational database ED9EM05A. 9 --      
                                       Either change the ASP group of the thread to the ASP group for relational        
                                       database ED9EM05A or use a CONNECT or SET CONNECTION statement to change the     
                                       active connection.                                                               
SQL0900    Diagnostic              30   11-12-30  04:11:26,525180  QSQROUTS     QSYS        *STMT    QSQROUTS    QSYS   
                                     From module . . . . . . . . :   QSQCLNUP                                           
                                     From procedure  . . . . . . :   SQROUTE_CLEANUP                                    
                                     Statement . . . . . . . . . :   3945                                                
 5761SS1 V6R1M0 080215                           Job Log                             ED9EM05A 11-12-30 04:11:32          
  Job name . . . . . . . . . . :   M01_NDC         User  . . . . . . :   REXNDC       Number . . . . . . . . . . . :   85
  Job description  . . . . . . :   REXBATCH        Library . . . . . :   REXNDCSHR    Section number . . . . . . . :   00
MSGID      TYPE                    SEV  DATE      TIME             FROM PGM     LIBRARY     INST     TO PGM      LIBRARY 
                                     To module . . . . . . . . . :   QSQCLNUP                                            
                                     To procedure  . . . . . . . :   SQROUTE_CLEANUP                                     
                                     Statement . . . . . . . . . :   3945                                                
                                     Message . . . . :   Application process not in a connected state.                   
                                     Cause . . . . . :   One of the following occurred: -- The current connection        
                                       was disconnected using the DISCONNECT statement. -- The current connection        
                                       was released and a commit occurred. -- A previous error has left the              
                                       application process in an unconnected state.   Use the Display Job Log            
                                       (DSPJOBLOG) command to see previous errors. Recovery  . . . :   Issue             
                                       CONNECT statement with the TO or RESET clause or the SET CONNECTION               
                                       statement to enter the connected state.                                           
SQL0900    Diagnostic              30   11-12-30  04:11:26,525203  QSQROUTS     QSYS        *STMT    QSQROUTS    QSYS    
                                     From module . . . . . . . . :   QSQCLNUP                                            
                                     From procedure  . . . . . . :   SQROUTE_CLEANUP                                     
                                                                                                                         
                                     Statement . . . . . . . . . :   3945                                              
                                     To module . . . . . . . . . :   QSQCLNUP                                          
                                     To procedure  . . . . . . . :   SQROUTE_CLEANUP                                   
                                     Statement . . . . . . . . . :   3945                                              
                                     Message . . . . :   Application process not in a connected state.                 
                                     Cause . . . . . :   One of the following occurred: -- The current connection      
                                       was disconnected using the DISCONNECT statement. -- The current connection      
                                       was released and a commit occurred. -- A previous error has left the            
                                       application process in an unconnected state.   Use the Display Job Log          
                                       (DSPJOBLOG) command to see previous errors. Recovery  . . . :   Issue           
                                       CONNECT statement with the TO or RESET clause or the SET CONNECTION             
                                       statement to enter the connected state.                                         
---------------------------------------------------
Med vänlig hälsning / Best regards
Åke H Olsson
Box 433   SE 551 16  Jönköping   Sweden   visit: Brunnsgatan 11
phone: +46 (0)36 342976   mobile: +46 (0)705 482976 fax: +46 (0)36 34 29 29
ake.olsson@xxxxxx    www.pdb.se
message: 3
date: Thu, 29 Dec 2011 11:04:27 -0800
from: CRPence <CRPbottle@xxxxxxxxx>
subject: Re: SQL-Commitment control issue generating enormout amount
	of jog	logs
On 29-Dec-2011 01:37 , ?ke Olsson wrote:
We have an overnight job where we from time to time see an enormous
number of job logs. Last night over 91 thousand pages.
Most of this is repeats of the same information and it all happens
in the flow between calls to two programs:
The starting point for the issues is a call to non-sql program.
We get a CPF8361 "Cannot place resource under commitment control.
Reason code 6" Followed by SQL0752 "Connection cannot be changed"
SQL0900 "Application process not in a connected state."
And this continues for another 90785 pages of joblog - same three
messages in that sequence.
The time used by this is just under 3 minutes.
I have checked all SQL programs in the flow to see if there could be
any SQL statements with problems and found none. We do not user
journaling or commitment control at all.
Any ideas on where to look?
   The best place to start would be with the messages, but viewed for 
the full details available from a LOG(4 0 *SECLVL) spooled joblog.  That 
will show all of the replacement text for each message as well as 
exactly which program(s) receive the errors [i.e. the "to" program] such 
as the program that apparently is wanting to place some resource under 
CmtCtl for which that request is being denied, and the program(s) that 
identified both the resource as being ineligible for the request [i.e. 
the "from" program] and the connection status difficulties.
   Which release of the LIC and OS [plus optionally PTF cumulative and 
database group levels] is installed where the problem is being 
encountered might be relevant to assist in excluding unrelated defect 
searches.  The first listed error has a partial [per lack of the full 
second level spooled joblog message details] symptom string which could 
be used in a defect search [though alone, produces results spanning 
several releases] as:
     msgCPF8361 RC6
Regards, Chuck
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