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IT29629: APPLICATION CAN GET CAUGHT IN ENDLESS LOOP IN BSORTINITCNTSRTSTACKINFO IF APPLHEAPSZ = 2147483647

Fixes are available

Db2 Version 11.1 Mod 4 Fix Pack 5 for Linux, UNIX, and Windows
Db2 Version 11.1 Mod 4 Fix Pack 6 for Linux, UNIX, and Windows
Db2 Version 11.1 Mod 4 Fix Pack 6 for Linux, UNIX, and Windows

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You can track all active APARs for this component.

 

APAR status

  • Closed as program error.

Error description

  • When running SQL we can get caught in an endless loop in
bsortInitCntSrtStackInfo if APPLHEAPSZ = 2147483647.

The EDU stack can look like the following:

Stack:
======================

0x090000004090BE00
bsortInitCntSrtStackInfo__FP8sqeAgentP23SQLS_BSORT_CNTSRT_STACK
+ 0xA0
0x09000000408FEC3C
sqlsBinSort__FP8sqeAgentP10SQLS_SLDESP10SQLS_SORTS + 0xC7C
0x09000000409019F0
sqlsBinSortIncremental__FP8sqeAgentP10SQLS_SLDESP10SQLS_SORTSi +
0x410
0x09000000408D9AC8
sqlsopen__FP8sqeAgentiT2P10SQLD_DPREDT2PP8SQLD_CCBPcPUcP12sqlri_
vectorPP10SQLD_VALUE + 0x3748
0x090000004078D818
IPRA.$sqldInsertTQ__FP8sqeAgentPcPP10SQLD_VALUET3P15SQLI_SUBAGNT
_CB + 0x118
0x090000004078BFDC sqldParScanSort__FP8sqeAgent + 0x9DC
0x0900000040C3E7FC IPRA.$sqleSubRequestRouter__FP8sqeAgentPUiPUl
+ 0x159C
0x0900000040C37AB8 sqleProcessSubRequest__FP8sqeAgent + 0x2C38
0x090000003C12C8AC RunEDU__8sqeAgentFv + 0x9EC
0x090000003C106C40 EDUDriver__9sqzEDUObjFv + 0x300
0x090000003BFE8280 sqloEDUEntry + 0x360

Local fix

  • Look to reduce the APPLHEAPSZ value below the maximum
value(2147483647)

eg.

db2 update db cfg for SAMPLE using APPLHEAPSZ 10000 AUTOMATIC

This should be done before you hit this issue.

Problem summary

  • ****************************************************************
* USERS AFFECTED:                                              *
* ALL                                                          *
****************************************************************
* PROBLEM DESCRIPTION:                                         *
* See Error Description                                        *
****************************************************************
* RECOMMENDATION:                                              *
* Upgrade to Db2 11.1 Mod 4 Fixpack 5 or higher                *
****************************************************************

Problem conclusion

  • First fixed in Db2 11.1 Mod 4 Fixpack 5

Temporary fix

  • 



Comments


    

  • 



APAR Information




    

  • APAR number
    IT29629
    • 

  • Reported component name
    DB2 FOR LUW
    • 

  • Reported component ID
    DB2FORLUW
    • 

  • Reported release
    B10
    • 

  • Status
    CLOSED  PER
    • 

  • PE
    NoPE
    • 

  • HIPER
    NoHIPER
    • 

  • Special Attention
    NoSpecatt / Xsystem
    • 

  • Submitted date
    2019-07-05
    • 

  • Closed date
    2020-01-20
    • 

  • Last modified date
    2020-01-20
    • 





    

  • APAR is sysrouted FROM one or more of the following:
    

    • 

  • APAR is sysrouted TO one or more of the following:
    

    • 



Fix information


    

  • Fixed component name
    DB2 FOR LUW
    • 

  • Fixed component ID
    DB2FORLUW
    • 



Applicable component levels


    

  • RB10  PSN
       UP
    • 








      
              
                            

              

              [{"Business Unit":{"code":"BU058","label":"IBM Infrastructure w\/TPS"},"Product":{"code":"SSEPGG","label":"DB2 for Linux- UNIX and Windows"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"11.1","Line of Business":{"code":"LOB10","label":"Data and AI"}}]
              

                          

          
 
        

      

    

      

        

          

            
Document Information


            

            


                        

            Modified date:
            

            04 May 2022
            

            
                      

        


        

        


      

    

  



    

  

  
    
            

          
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