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IJ06297: FUSER RUN ON A LOCAL FILESYSTEM CAN HANG DUE TO NFS DOWN

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APAR status

  • Closed as program error.

Error description

  • In certain PowerHA environments fuser run on a local
filesytem has been seen to hang due to the NFS network
down. It would seem a defect that fuser run on a local
filesytem would be affected by a problem with NFS.
The current design of fuser depends on accessing all
processes one at a time to determine if any of their
files belong to the local file system. Currently a
stat call is used to determine the attributes of the
precesse's executable. If the executable is NFS
mounted the stat depends on NFS network being up to
be successful and can hang if it is not up.
What is needed is a new stat call that can obtain
the attributes known locally which do not need to be
accessed over the network.

Local fix

  • Using soft NFS mounts that would return an error instead
hanging can be used as workaround.

Problem summary

  • fuser command hangs when NFS is down, even when not run on an
NFS file/filesystem

Problem conclusion

  • We now ignore NFS processes that we know will not be a match
when fuser is run on a local file/ filesystem

Temporary fix

  • 



Comments


    

  • 



APAR Information




    

  • APAR number
    IJ06297
    • 

  • Reported component name
    AIX V7.2
    • 

  • Reported component ID
    5765CD200
    • 

  • Reported release
    720
    • 

  • Status
    CLOSED  PER
    • 

  • PE
    NoPE
    • 

  • HIPER
    NoHIPER
    • 

  • Submitted date
    2018-05-09
    • 

  • Closed date
    2018-05-09
    • 

  • Last modified date
    2019-01-29
    • 





    

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

    
IJ03793
    

    • 

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

    
U883752
    

    • 



Fix information


    

  • Fixed component name
    AIX V7.2
    • 

  • Fixed component ID
    5765CD200
    • 



Applicable component levels


    

  • R720  PSY  U883752
       UP19/01/29  I  1000
    • 








      
              
                            

              

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Document Information


            

            


                        

            Modified date:
            

            29 January 2019
            

            
                      

        


        

        


      

    

  



    

  

  
    
            

          
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