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IV91922: POSSIBLE DATA LOSS WITH CAPI ADAPTER AFTER EEH APPLIES TO AIX 7200-01

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APAR status

  • Closed as program error.

Error description

  • **************************************************************
* USERS AFFECTED:
* Systems running the AIX 7200-01 Technology Level
* with devices.capi.1410f0041410f004.com below the 7.2.1.1
* level.
**************************************************************
* PROBLEM DESCRIPTION:
* With the CAPI adapter (FC EJ17 and EJ18), if an
* EEH (Extended Error Handling) condition happens, there is a
* very small timing window where the application may read
* incorrect data from a CAPI device possibly resulting in
* undetected data loss.
*
* An EEH condition can occur during adapter firmware update or
* CAPI bus errors.
**************************************************************
* RECOMMENDATION:
* Install APAR IV91922.
* Prior to fix availability, an interim fix is available from
* either
* ftp://aix.software.ibm.com/aix/ifixes/iv91922/
* https://aix.software.ibm.com/aix/ifixes/iv91922/
* The ifix can be installed using Live Update (LU).
* If LU is not used, installation of the ifix requires a
* reboot.
**************************************************************

Local fix

  • If you don't use the CAPI device during a firmware update,
it will reduce the risk of seeing this problem.

Problem summary

  • When an EEH condition is discovered, there is a very small
timing window where the CAPI adapter driver completes I/O
requests to the upper layers by clearing the SUE error in
the user buffer.  This could cause the upper layers to read
the wrong data from a CAPI device.

Problem conclusion

  • Fix the command processing path in CAPI adapter device driver
to not clear the user buffer during EEH recovery condition.

Temporary fix

  •   *********
  * HIPER *
  *********

Comments

  • 



APAR Information




    

  • APAR number
    IV91922
    • 

  • Reported component name
    AIX V7.2
    • 

  • Reported component ID
    5765CD200
    • 

  • Reported release
    720
    • 

  • Status
    CLOSED  PER
    • 

  • PE
    NoPE
    • 

  • HIPER
    YesHIPER
    • 

  • Submitted date
    2017-01-04
    • 

  • Closed date
    2017-01-04
    • 

  • Last modified date
    2017-04-10
    • 





    

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

    
IV91464
    

    • 

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

    • 



Fix information


    

  • Fixed component name
    AIX V7.2
    • 

  • Fixed component ID
    5765CD200
    • 



Applicable component levels


    

  • R720  PSY  U872712
       UP17/04/06  I  1000  Ž
    • 



PTF to Fileset Mapping








      
              
                            

              

              [{"Business Unit":{"code":"BU058","label":"IBM Infrastructure w\/TPS"},"Product":{"code":"SSVEF8","label":"AIX 7.2 Enterprise Edition"},"Component":"","ARM Category":[],"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"720","Edition":"","Line of Business":{"code":"LOB08","label":"Cognitive Systems"}},{"Business Unit":{"code":"BU054","label":"Systems w\/TPS"},"Product":{"code":"SG11S","label":"AIX 7.2 HIPERS, APARs and Fixes"},"Component":"","ARM Category":[],"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"720","Edition":"","Line of Business":{"code":"","label":""}}]
              

                          

          
 
        

      

    

      

        

          

            
Document Information


            

            


                        

            Modified date:
            

            10 April 2017
            

            
                      

        


        

        


      

    

  



    

  

  
    
            

          
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