IBM Support

IJ31047: ASSERT !OWNED_BY_CALLER(LOCKWORDCOPY, LOCKWORDCOPY)

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APAR status

  • Closed as program error.

Error description

  • mmfsd code assert at !OWNED_BY_CALLER(lockWordCopy,
lockWordCopy) Failure at line 1275 in file
/project/spreltac505/build/rtac505s003a/src/avs/fs/mmfs/t
s/tasking/dSynch.C

Local fix

  • 



Problem summary


    

  • The prefetch thread is checking the snapshot status while
holding the prefetch list mutex lock, then runs into a buffer
stealing which requires to acquire the pretech list mutex lock
again, thus forms a self-deadlock and triggers such assertion.

    



Problem conclusion


    

  • Eliminate the nested acquisition on pretech list mutex lock by
checking the snapshot status outside the prefetch list mutex
lock.

    



Temporary fix


    

  • 



Comments


    

  • 



APAR Information




    

  • APAR number
    IJ31047
    • 

  • Reported component name
    SPEC SCALE STD
    • 

  • Reported component ID
    5737F33AP
    • 

  • Reported release
    505
    • 

  • Status
    CLOSED  PER
    • 

  • PE
    NoPE
    • 

  • HIPER
    NoHIPER
    • 

  • Special Attention
    NoSpecatt / Xsystem
    • 

  • Submitted date
    2021-02-25
    • 

  • Closed date
    2021-03-08
    • 

  • Last modified date
    2021-03-08
    • 





    

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

    • 

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

    • 



Fix information


    

  • Fixed component name
    SPEC SCALE STD
    • 

  • Fixed component ID
    5737F33AP
    • 



Applicable component levels


    








      
              
                            

              

              [{"Business Unit":{"code":"BU058","label":"IBM Infrastructure w\/TPS"},"Product":{"code":"STXKQY","label":"IBM Spectrum Scale"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"505","Line of Business":{"code":"LOB26","label":"Storage"}}]
              

                                                                    

          
 
        

      

    

      

        

          

            
Document Information


            

            


                        

            Modified date:
            

            10 March 2021
            

            
                      

        


        

        


      

    

  



    

  

  
    
            

          
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