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VM66398: HUNG Z/OS GUEST ON Z/VM WITH ROCE WORKLOAD WITH SET IOASSIST OFF

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APAR status

  • Closed as program error.

Error description

  • When SET IOASSIST OFF is in effect, a z/OS guest can hang when
running RoCE workload.

Local fix

  • 



Problem summary


    

  • ****************************************************************
* USERS AFFECTED: All users of SET IOASSIST OFF running RoCE w *
****************************************************************
* PROBLEM DESCRIPTION:                                         *
****************************************************************
* RECOMMENDATION: APPLY PTF                                    *
****************************************************************
A z/OS guest running on z/VM can hang when running RoCE
workload with SET IOASSIST OFF in effect.

    



Problem conclusion


    

  • The hang is due to a lock which was obtained and never released.
The code in HCPPCH has been corrected.

    



Temporary fix


    

  • 



Comments


    

  • 



APAR Information




    

  • APAR number
    VM66398
    • 

  • Reported component name
    VM CP
    • 

  • Reported component ID
    568411202
    • 

  • Reported release
    640
    • 

  • Status
    CLOSED  PER
    • 

  • PE
    NoPE
    • 

  • HIPER
    NoHIPER
    • 

  • Special Attention
    NoSpecatt / Xsystem
    • 

  • Submitted date
    2020-06-04
    • 

  • Closed date
    2020-06-25
    • 

  • Last modified date
    2021-06-29
    • 





    

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

    • 

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

    
UM35682 UM35683
    

    • 



Modules/Macros


    

  • HCPPCH

    



Fix information


    

  • Fixed component name
    VM CP
    • 

  • Fixed component ID
    568411202
    • 



Applicable component levels


    

  • R640  PSY  UM35682
       UP20/07/06  I  1000
    • 

  • R710  PSY  UM35683
       UP20/07/06  P  2101
    • 



Fix is available


    

  • Select the PTF appropriate for your component level.
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              [{"Business Unit":{"code":"BU011","label":"Systems - zSystems software"},"Product":{"code":"SG27M"},"Platform":[{"code":"PF054","label":"z\/OS"}],"Version":"640","Line of Business":{"code":"LOB16","label":"Mainframe HW"}}]
              

                          

          
 
        

      

    

      

        

          

            
Document Information


            

            


                        

            Modified date:
            

            30 June 2021
            

            
                      

        


        

        


      

    

  



    

  

  
    
            

          
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