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IJ41758: LINUX OS CRASH CAUSED BY MMCCR AND TRACEDEV MODULE

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APAR status

  • Closed as program error.

Error description

  • Part of GPFS are kernel modules that are loaded upon
startup and used by other components. Usage counters
were not used correctly in the tracedev module,
which can lead to the module being unloaded while
still in use, resulting in a kernel crash. One case
where this is possible is running the "mmvdisk server configure"
and "mmvdisk server unconfigure"
commands with the --recycle option.

Local fix

  • Avoid stopping GPFS immediately after starting up.

Problem summary

  • Part of GPFS are kernel modules that are loaded upon
startup and used by other components. Usage counters
were not used correctly in the tracedev module,
which can lead to the module being unloaded while
still in use, resulting in a kernel crash. One case
where this is possible is running the "mmvdisk server configure"
and "mmvdisk server unconfigure"
commands with the --recycle option.

Problem conclusion

  • This problem is fixed in 5.1.2 PTF 1
To see all Spectrum Scale APARs and
their respective fix solutions refer to page
https://public.dhe.ibm.com/storage/spectrumscale/spectrum_scale
apars.html


Benefits of the solution:
Avoid the kernel crash, by handling the usage
counters of the tracedev module correctly.

Work Around:
Avoid stopping GPFS immediately after starting up.
Problem trigger:
Run GPFS shutdown and startup. This is a rare problem,
so running this or the mentioned "mmvdisk server" command
in a loop will be necessary to trigger the problem.
Symptom: Abend/Crash
Platforms affected: ALL Linux OS environments
Functional Area affected: All Scale Users
Customer Impact: Suggested

Temporary fix

  • 



Comments


    

  • 



APAR Information




    

  • APAR number
    IJ41758
    • 

  • Reported component name
    SPEC SCALE STD
    • 

  • Reported component ID
    5737F33AP
    • 

  • Reported release
    512
    • 

  • Status
    CLOSED  PER
    • 

  • PE
    NoPE
    • 

  • HIPER
    NoHIPER
    • 

  • Special Attention
    NoSpecatt / Xsystem
    • 

  • Submitted date
    2022-08-23
    • 

  • Closed date
    2022-08-23
    • 

  • Last modified date
    2022-08-23
    • 





    

  • 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"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"512","Line of Business":{"code":"LOB26","label":"Storage"}}]
              

                                                                    

          
 
        

      

    

      

        

          

            
Document Information


            

            


                        

            Modified date:
            

            23 August 2022
            

            
                      

        


        

        


      

    

  



    

  

  
    
            

          
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