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IZ78750: SYSTEM HANG IN VMMD WHILE WAITING ON PAGE IN APPLIES TO AIX 6100-05

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APAR status

  • Closed as program error.

Error description

  • Possible system crash or process hang when a multi-threaded
process is forking and the thread doing the fork() is also
having its private memory migrated to another affinity domain.
The vmmd kernel thread would have a stack trace with
v_thread_reaffin_getthrd_cache() near the top.

Local fix

  • 



Problem summary


    

  • ****************************************************************
* USERS AFFECTED:
* Systems running the 6100-05 Technology Level with the
* bos.mp64 fileset at the 6.1.5.0 through 6.1.5.2 level.
****************************************************************
* PROBLEM DESCRIPTION:
* Possible system crash or process hang when a multi-threaded
* process is forking and the thread doing the fork() is also
* having its private memory migrated to another affinity domain.
****************************************************************
* RECOMMENDATION:
* Install APAR IZ78750.
****************************************************************

    



Problem conclusion


    

  • Do not migrate threads while they're on the forkstack.

    



Temporary fix


    

  • 



Comments


    

  • 6100-05 - use AIX APAR IZ78750
6100-06 - use AIX APAR IZ77954
6100-06 - use AIX APAR IZ78276
7100-00 - use AIX APAR IZ80551

    



APAR Information




    

  • APAR number
    IZ78750
    • 

  • Reported component name
    AIX 610 STD EDI
    • 

  • Reported component ID
    5765G6200
    • 

  • Reported release
    610
    • 

  • Status
    CLOSED  PER
    • 

  • PE
    NoPE
    • 

  • HIPER
    NoHIPER
    • 

  • Submitted date
    2010-07-02
    • 

  • Closed date
    2010-07-02
    • 

  • Last modified date
    2013-03-28
    • 





    

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

    
IZ77954
    

    • 

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

    • 



Fix information


    

  • Fixed component name
    AIX 610 STD EDI
    • 

  • Fixed component ID
    5765G6200
    • 



Applicable component levels


    

  • R610  PSY  U834695
       UP10/08/20  I  1000
    • 



PTF to Fileset Mapping








      
              
                            

              

              [{"Business Unit":{"code":"BU054","label":"Systems w\/TPS"},"Product":{"code":"SSMV87","label":"AIX 6.1 Enterprise Edition"},"Component":"","ARM Category":[],"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"610","Edition":"","Line of Business":{"code":"LOB08","label":"Cognitive Systems"}},{"Business Unit":{"code":"BU058","label":"IBM Infrastructure w\/TPS"},"Product":{"code":"SSMVAX","label":"AIX Express Edition"},"Component":"","ARM Category":[],"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"610","Edition":"","Line of Business":{"code":"LOB08","label":"Cognitive Systems"}},{"Business Unit":{"code":"BU054","label":"Systems w\/TPS"},"Product":{"code":"SSAUMY","label":"IBM AIX Enterprise Edition"},"Component":"","ARM Category":[],"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"610","Edition":"","Line of Business":{"code":"","label":""}},{"Business Unit":{"code":"BU054","label":"Systems w\/TPS"},"Product":{"code":"SG11Q","label":"AIX 6.1 HIPERS, APARs and Fixes"},"Component":"","ARM Category":[],"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"610","Edition":"","Line of Business":{"code":"","label":""}}]
              

                          

          
 
        

      

    

      

        

          

            
Document Information


            

            


                        

            Modified date:
            

            28 March 2013
            

            
                      

        


        

        


      

    

  



    

  

  
    
            

          
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