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IZ81088: FUSER -FX MAY GIVE INCORRECT PIDS WHEN MMAPED FILES ARE OPENED APPLIES TO AIX 6100-06

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APAR status

  • Closed as program error.

Error description

  • fuser -fx may give incorrect PIDs when mmaped files are
opened.

If the system has mmap()'ed file in open state,
fuser -fx for a non-mmap()'ed files incorrectly lists
process IDs of all process which have mmap()'ed file
in open state.

# cd /tmp/
# ls > aaaa
# ls > bbbb
# ./mmap_file -s /tmp/bbbb (a program which does mmap()).
mmap_file#5570612: /tmp/bbbb
mmap_file#5570612: mmapp = 0x30000000-0x30000004

# fuser -fx /tmp/bbbb
/tmp/bbbb:  5570612m   << This is okay.

# fuser -fx /tmp/aaaa
/tmp/aaaa:  5570612m   << It should NOT display this pid.

This APAR superseeds, IZ75959 (AIX 6.1 TL5)

Local fix

  • use -O option

Problem summary

  • Cannot unmount filesystems, as fuser fails to detect mapped
files processes

Problem conclusion

  • Do proper validation to detect mapped files.

Temporary fix

  • 



Comments


    

  • 6100-04 - use AIX APAR IZ77347
6100-05 - use AIX APAR IZ77904
6100-06 - use AIX APAR IZ80837
6100-06 - use AIX APAR IZ81088
7100-00 - use AIX APAR IZ84259

    



APAR Information




    

  • APAR number
    IZ81088
    • 

  • Reported component name
    AIX 610 STD EDI
    • 

  • Reported component ID
    5765G6200
    • 

  • Reported release
    610
    • 

  • Status
    CLOSED  PER
    • 

  • PE
    NoPE
    • 

  • HIPER
    NoHIPER
    • 

  • Submitted date
    2010-07-27
    • 

  • Closed date
    2010-07-27
    • 

  • Last modified date
    2013-03-28
    • 





    

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

    
IZ77347
    

    • 

  • 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  U835816
       UP11/05/10  I  1000
    • 



PTF to Fileset Mapping








      
              
                            

              

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Document Information


            

            


                        

            Modified date:
            

            28 March 2013
            

            
                      

        


        

        


      

    

  



    

  

  
    
            

          
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