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IZ42660: DOUBLE FREE OF A MEMORY BLOCK MAY OCCUR IF USER INTERRUPT IS RECEIVED WHILE DB2 IS RETRIEVING LONG OR LOB DATA

Fixes are available

DB2 Version 9.5 Fix Pack 5 for Linux, UNIX, and Windows
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

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You can track all active APARs for this component.

 

APAR status

  • Closed as program error.

Error description

  • Double free of a memory block may occur if user interrupt is
received while DB2 is retrieving long or lob data.

The following messages are logged in db2diag.log:
(1)
EDUID   : ##                   EDUNAME: db2agent (YOURDB) 0
FUNCTION: DB2 UDB, runtime interpreter, sqlriWriteCsoIntoBuffer,
probe:1388
CALLED  : DB2 UDB, runtime interpreter, sqlrimso
RETCODE : ZRC=0x80480003=-2142765053=SQLDXE_INTR "User
Interrupt"
          DIA8003C The interrupt  has been received.
DATA #1 : String, 47 bytes
sqlriWriteCsoIntoBuffer: materialization failed

(2)
EDUID   : ##                   EDUNAME: db2agent (YOURDB) 0
FUNCTION: DB2 UDB, SQO Memory Management,
sqloDiagnoseFreeBlockFailure, probe:10
MESSAGE : Possible memory corruption detected.

(3)
EDUID   : ##                   EDUNAME: db2agent (YOURDB) 0
FUNCTION: DB2 UDB, SQO Memory Management,
sqloDiagnoseFreeBlockFailure, probe:30
DATA #1 : String, 12 bytes
Double free.

Then DB2 engine process receives a segment violation signal.

Local fix

  • N/A

Problem summary

  • DOUBLE FREE OF A MEMORY BLOCK MAY OCCUR IF USER INTERRUPT IS
RECEIVED WHILE DB2 IS RETRIEVING LONG OR LOB DATA

Problem conclusion

  • First fixed in DB2 9.5 FixPak 5

Temporary fix

  • N/A

Comments

  • 



APAR Information




    

  • APAR number
    IZ42660
    • 

  • Reported component name
    DB2 UDB ESE SOL
    • 

  • Reported component ID
    5765F4102
    • 

  • Reported release
    950
    • 

  • Status
    CLOSED  PER
    • 

  • PE
    NoPE
    • 

  • HIPER
    NoHIPER
    • 

  • Special Attention
    NoSpecatt
    • 

  • Submitted date
    2009-01-27
    • 

  • Closed date
    2009-12-15
    • 

  • Last modified date
    2009-12-15
    • 





    

  • 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 UDB ESE SOL
    • 

  • Fixed component ID
    5765F4102
    • 



Applicable component levels


    

  • R950  PSY
       UP
    • 








      
              
                            

              

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Document Information


            

            


                        

            Modified date:
            

            15 December 2009
            

            
                      

        


        

        


      

    

  



    

  

  
    
            

          
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