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IJ20341: ISSUING "LS -L" TO A SPECIFIC DIRECTORY CAUSES LONG WAITERS

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APAR status

  • Closed as program error.

Error description

  • Users can not ls a specific directory,  it caused comamnd
hang and below waiters on all the nodes:


Waiting 274.7932 sec since 15:17:05, monitored, thread
30874 SharedHashTabFetchHandlerThread: on ThCond
0x18007F7A718 (LkObjCondvar), reason 'change_lock_shark
waiting to set acquirePending flag'
Waiting 274.7932 sec since 15:17:05, monitored, thread
30872 InodePrefetchWorkerThread: on ThCond 0x7F04340011B0
(MsgRecordCondvar), reason 'RPC wait' for
tmMsgTellAcquire1 on node

Local fix

  • 



Problem summary


    

  • Deadlock is happening due to the lock ordering issue while
reading the same file from multiple threads.

    



Problem conclusion


    

  •  Benefits of the solution: Fixed the lock ordering issue to
avoid the deadlock.
Work around: None.

Problem trigger: Reading a single file from multiple threads.

Symptom: Deadlock

Platforms affected: All

Functional Area affected: All Scale Users

Customer Impact: High Importance

    



Temporary fix


    

  • 



Comments


    

  • 



APAR Information




    

  • APAR number
    IJ20341
    • 

  • Reported component name
    SPECTRUM SCALE
    • 

  • Reported component ID
    5725Q01AP
    • 

  • Reported release
    423
    • 

  • Status
    CLOSED  PER
    • 

  • PE
    NoPE
    • 

  • HIPER
    NoHIPER
    • 

  • Special Attention
    NoSpecatt / Xsystem
    • 

  • Submitted date
    2019-10-16
    • 

  • Closed date
    2019-11-08
    • 

  • Last modified date
    2019-11-08
    • 





    

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

    • 

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

    
IJ20881
    

    • 



Fix information


    

  • Fixed component name
    SPECTRUM SCALE
    • 

  • Fixed component ID
    5725Q01AP
    • 



Applicable component levels


    








      
              
                            

              

              [{"Business Unit":{"code":"BU058","label":"IBM Infrastructure w\/TPS"},"Product":{"code":"STXKQY","label":"IBM Spectrum Scale"},"Component":"","ARM Category":[],"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"423","Edition":"","Line of Business":{"code":"LOB26","label":"Storage"}},{"Business Unit":{"code":"BU058","label":"IBM Infrastructure w\/TPS"},"Product":{"code":"SSFKCN","label":"General Parallel File System"},"Component":"","ARM Category":[],"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"423","Edition":"","Line of Business":{"code":"","label":""}}]
              

                                                                    

          
 
        

      

    

      

        

          

            
Document Information


            

            


                        

            Modified date:
            

            08 November 2019
            

            
                      

        


        

        


      

    

  



    

  

  
    
            

          
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