IBM Support

IT28412: DB2 FAILS ON SOME AVX-512 CAPABLE CPUS

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

Subscribe

You can track all active APARs for this component.

 

APAR status

  • Closed as fixed if next.

Error description

  • Db2 V11.1.4.4 utilizes the following Intel AVX-512 instructions
extensions:
AVX512DP,AVX512F,AVX512BW,AVX512CD,AVX512VL
Not all Intel AVX-512 capable CPUs support all these extensions.
Db2 currently only checks for AVX512F and AVX512CD.

On Linux the supported instruction extensions can be verified
using
cat /proc/cpuinfo | grep flags

Local fix

  • db2set DB2_CPU_FEATURE_DISABLE=AVX512

Problem summary

  • ****************************************************************
* USERS AFFECTED:                                              *
* Db2 V11.1.4.4 users using certain Intel AVX512 CPUs.         *
****************************************************************
* PROBLEM DESCRIPTION:                                         *
* See Error Description                                        *
****************************************************************
* RECOMMENDATION:                                              *
* Upgrade to next release.                                     *
****************************************************************

Problem conclusion

  • 



Temporary fix


    

  • 



Comments


    

  • 



APAR Information




    

  • APAR number
    IT28412
    • 

  • Reported component name
    DB2 FOR LUW
    • 

  • Reported component ID
    DB2FORLUW
    • 

  • Reported release
    B10
    • 

  • Status
    CLOSED  FIN
    • 

  • PE
    NoPE
    • 

  • HIPER
    NoHIPER
    • 

  • Special Attention
    NoSpecatt / Xsystem
    • 

  • Submitted date
    2019-03-11
    • 

  • Closed date
    2020-01-18
    • 

  • Last modified date
    2020-01-18
    • 





    

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

    • 

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

    • 



Fix information


    



Applicable component levels


    

  • RB10  PSN
       UP
    • 

  • RB10  PSY
       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
            

            
                      

        


        

        


      

    

  



    

  

  
    
            

          
Page Feedback