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IV70175: DEBUG KERNEL TRAP IN V_RELALIAS_BLOCK+000498 APPLIES TO AIX 6100-09

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APAR status

  • Closed as program error.

Error description

  • Using a DEBUG kernel on a P8 system may hit an incorrect assert
when trying to use mprotect() to remove all access to a
privately mmap'ed object that still has translations to the
source object.

The stack trace back will have v_relalias_block.
Here is one example trace back:

KDB(0)> f
pvthread+013F00 STACK:
￭00023980abend_trap+000000 ()
￭0026FE98v_relalias_block+000498 (??, ??, ??, ??, ??)
￭002735E4v_relalias+000704 (??, ??, ??, ??, ??)
￭00400DD4v_protectap+0007F4 (??, ??, ??, ??, ??, ??)
￭004D3E78v_preprotectap+000238 (??, ??, ??, ??, ??, ??)
￭0002F3E0begfst+000190 ()

Local fix

  • 



Problem summary


    

  • Using a DEBUG kernel on a P8 system may hit an incorrect assert
when trying to use mprotect() to remove all access to a
privately mmap'ed object that still has translations to the
source object.

The stack trace back will have v_relalias_block.
Here is one example trace back:

KDB(0)> f
pvthread+013F00 STACK:
 00023980 abend_trap+000000 ()
 0026FE98 v_relalias_block+000498 (??, ??, ??, ??, ??)
 002735E4 v_relalias+000704 (??, ??, ??, ??, ??)
 00400DD4 v_protectap+0007F4 (??, ??, ??, ??, ??, ??)
 004D3E78 v_preprotectap+000238 (??, ??, ??, ??, ??, ??)
 0002F3E0 begfst+000190 ()

    



Problem conclusion


    

  • Fix the DEBUG assert.

    



Temporary fix


    

  • 



Comments


    

  • 6100-09 - use AIX APAR IV70175
7100-03 - use AIX APAR IV70167

    



APAR Information




    

  • APAR number
    IV70175
    • 

  • Reported component name
    AIX 610 STD EDI
    • 

  • Reported component ID
    5765G6200
    • 

  • Reported release
    610
    • 

  • Status
    CLOSED  PER
    • 

  • PE
    NoPE
    • 

  • HIPER
    NoHIPER
    • 

  • Submitted date
    2015-02-27
    • 

  • Closed date
    2015-02-27
    • 

  • Last modified date
    2015-11-22
    • 





    

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

    
IV70167
    

    • 

  • 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  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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