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IV95102: SYSTEM CRASH WHEN USING PROCFS FOR PROCESSES CLOSING MANY FILES

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APAR status

  • Closed as program error.

Error description

  • **************************************************************
* USERS AFFECTED:
* Systems running the AIX 6100-09 Technology Level
* with bos.mp64 between and including the 6.1.9.15
* and 6.1.9.201 levels.
  **************************************************************
* ERROR DESCRIPTION:
* If procfs /proc/<pid>/fd/ directory is accessed for a
* process that uses many file descriptors, the LPAR my crash
* due to bad values in the application stack data.
* This occurs when the application closes many file
* descriptors all at once while at the same time the procfs
* data in /proc/<pid>/fd/ is being accessed.
*
* This has been most commonly seen when the 'fuser' command is
* run while an application is running that opens and closes
* many files during its execution.
* The crash can have varied symptoms, but in one common case
* the stack looks like:
* (0)> f
* pvthread+018000 STACK:
* 000039B4 .sys_call_ret+000078 ()
* 00003958 .sys_call_ret+00001C ()
  **************************************************************
* RECOMMENDATION:
* Install APAR IV95102.
* Prior to fix availability, an interim fix is available from
* either
* ftp://aix.software.ibm.com/aix/ifixes/iv95102/
* https://aix.software.ibm.com/aix/ifixes/iv95102/
* Installation of the ifix requires a reboot.
  **************************************************************

Local fix

  • 



Problem summary


    

  • System crash with following stack:
(0)> f
pvthread+018000 STACK:
 000039B4 .sys_call_ret+000078 ()
 00003958 .sys_call_ret+00001C ()
uninitialized stack variable content access to write
reulted in corruption of mst/other u-block area.

    



Problem conclusion


    

  • Change the code to avoid this corruption.

    



Temporary fix


    

  • *********
  * HIPER *
  *********

    



Comments


    

  • 



APAR Information




    

  • APAR number
    IV95102
    • 

  • Reported component name
    AIX 610 STD EDI
    • 

  • Reported component ID
    5765G6200
    • 

  • Reported release
    610
    • 

  • Status
    CLOSED  PER
    • 

  • PE
    NoPE
    • 

  • HIPER
    YesHIPER
    • 

  • Submitted date
    2017-04-13
    • 

  • Closed date
    2017-04-13
    • 

  • Last modified date
    2017-10-17
    • 





    

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

    
IV92812
    

    • 

  • 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  U870015
       UP17/10/17  I  1000  Ž
    • 



PTF to Fileset Mapping








      
              
                            

              

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Document Information


            

            


                        

            Modified date:
            

            17 December 2021
            

            
                      

        


        

        


      

    

  



    

  

  
    
            

          
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