IBM Support

IJ29248: MMFSD COREDUMP AT DASSIGNSHAREDBUFFERSPACE(INT)

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APAR status

  • Closed as program error.

Error description

  • lxtrace command keep running, which may cause mmfsd core
dump at function dAssignSharedBufferSpace(int)

Reported in:
Spectrum Scale 4.2.3.17

Local fix

  • When enable Spectrum Scale trace, do not call
lxtrace-xxxx command but use mmtracectl instead.

Problem summary

  • Spectrum Scale has core dump triggered in
dAssignSharedBufferSpace() due to
segmentation fault hit by mmfsd or lxtrace daemon.

Problem conclusion

  • Benefits of the solution:
Avoid Spectrum Scale crash.

Work around:
User should not directly use lxtrace command,
instead you should use mmtrace or mmtracectl
command to recycle the trace data.

Problem trigger:
Enabling overwrite tracing and using internal
lxtrace command to recycle the trace data.

Symptom:
daemon crash

Platforms affected:
Linux

Functional Area affected:
All Linux Scale users when enabling overwrite
tracing and using internal lxtrace command.

Customer Impact:
Suggested

Temporary fix

  • 



Comments


    

  • 



APAR Information




    

  • APAR number
    IJ29248
    • 

  • Reported component name
    SPEC SCALE STD
    • 

  • Reported component ID
    5737F33AP
    • 

  • Reported release
    510
    • 

  • Status
    CLOSED  PER
    • 

  • PE
    NoPE
    • 

  • HIPER
    NoHIPER
    • 

  • Special Attention
    NoSpecatt / Xsystem
    • 

  • Submitted date
    2020-11-11
    • 

  • Closed date
    2020-11-11
    • 

  • Last modified date
    2020-11-11
    • 





    

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

    
IJ28647
    

    • 

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

    
IJ29530
    

    • 



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":"510","Line of Business":{"code":"LOB26","label":"Storage"}}]
              

                                                                    

          
 
        

      

    

      

        

          

            
Document Information


            

            


                        

            Modified date:
            

            02 December 2020
            

            
                      

        


        

        


      

    

  



    

  

  
    
            

          
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