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IV55974: REDUCE CPU FABRIC CHATTER TO AVOID HANG DURING DR EVENTS APPLIES TO AIX 7100-03

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APAR status

  • Closed as program error.

Error description

  • System responds sluggishly or is completely hung.

Multiple CPUs show the following stack as they spin on atomic
op

pvthread+010E00 STACK:  Ý0000AF28¨.fetch_and_nop+000008 ()
Ý000DE37C¨dr_mpc_freeze_handler+0000DC ()
Ý001EACBC¨drp_mpc_handler+00013C () Ý0030C244¨i_softmod+000584
() Ý00154A14¨flih_util+000260 ()

Local fix

  • 



Problem summary


    

  • System responds sluggishly or is completely hung.

Multiple CPUs show the following stack as they spin on atomic
op

pvthread+010E00 STACK:   0000AF28 .fetch_and_nop+000008 ()
 000DE37C dr_mpc_freeze_handler+0000DC ()
 001EACBC drp_mpc_handler+00013C ()  0030C244 i_softmod+000584
()  00154A14 flih_util+000260 ()

    



Problem conclusion


    

  • Perform an unserialized read of the shared word first and then
a serialized, atomic read only when the first read indicates a
value is present.

    



Temporary fix


    

  • 



Comments


    

  • 6100-09 - use AIX APAR IV55958
6100-09 - use AIX APAR IV55958
6100-09 - use AIX APAR IV55958
7100-03 - use AIX APAR IV55974
7100-04 - use AIX APAR IV56109

    



APAR Information




    

  • APAR number
    IV55974
    • 

  • Reported component name
    AIX V7.1
    • 

  • Reported component ID
    5765H4000
    • 

  • Reported release
    710
    • 

  • Status
    CLOSED  PER
    • 

  • PE
    NoPE
    • 

  • HIPER
    NoHIPER
    • 

  • Submitted date
    2014-02-26
    • 

  • Closed date
    2014-02-26
    • 

  • Last modified date
    2016-05-10
    • 





    

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

    
IV55958
    

    • 

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

    • 



Fix information


    

  • Fixed component name
    AIX V7.1
    • 

  • Fixed component ID
    5765H4000
    • 



Applicable component levels


    

  • R710  PSY  U858978
       UP14/05/22  I  1000
    • 



PTF to Fileset Mapping








      
              
                            

              

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Document Information


            

            


                        

            Modified date:
            

            10 May 2016
            

            
                      

        


        

        


      

    

  



    

  

  
    
            

          
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