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IV66512: DMS timeout during amepat crit sect on only available cpu APPLIES TO AIX 6100-09

A fix is available

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APAR status

  • Closed as program error.

Error description

  • DMS timeout might occur when amepat is running on the
only available
CPU on the system.

All the other CPUs are folded and amepat has monopolized
the
only online CPU in the system

Stack trace will be something like

pvthread+0F2200 STACK:
[0005F480]begfst+000200 ()
[0005F47C]begfst+0001FC ()
[001327E0]vm_cmem_get_ref_stats+000100 (??)
[006EBFA0]_vmgetinfo+001100 (??, ??, ??, ??)
[006F46A8]vmgetinfo+000048 (??, ??, ??)
[00003888]mfspurr_sc_flih01+0000E4 ()
[kdb_get_virtual_memory] no real storage @ 2FF224B8

Local fix

  • To circumvent this issue, make sure that there is always
an extra
CPU available. This can be achieved by the following
command

schedo -p -o vpm_xvcpus=2

NOTE: this still might not protect from a situation where
HATDS
or similar process is bound to this particular CPU where
'amepat' command is running

Problem summary

  • A heartbeat or other realtime process will incorrectly signal
a failure.

Problem conclusion

  • Insert a manual scheduler check during statistics processing.

Temporary fix

  • 



Comments


    

  • 6100-09 - use AIX APAR IV66512
7100-03 - use AIX APAR IV66750

    



APAR Information




    

  • APAR number
    IV66512
    • 

  • Reported component name
    AIX 610 STD EDI
    • 

  • Reported component ID
    5765G6200
    • 

  • Reported release
    610
    • 

  • Status
    CLOSED  PER
    • 

  • PE
    NoPE
    • 

  • HIPER
    NoHIPER
    • 

  • Submitted date
    2014-11-03
    • 

  • Closed date
    2014-11-06
    • 

  • Last modified date
    2015-11-22
    • 





    

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

    • 

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

    
IV66750 IV66804
    

    • 



Fix information


    

  • Fixed component name
    AIX 610 STD EDI
    • 

  • Fixed component ID
    5765G6200
    • 



Applicable component levels


    

  • R610  PSY  U861403
       UP15/11/22  I  1000
    • 



PTF to Fileset Mapping








      
              
                            

              

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Document Information


            

            


                        

            Modified date:
            

            17 December 2021
            

            
                      

        


        

        


      

    

  



    

  

  
    
            

          
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