IBM Support

IJ21396: NMI WATCHDOG: BUG: SOFT LOCKUP - CPU STUCK [NFSD]

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APAR status

  • Closed as program error.

Error description

  • On RHEL 7 nodes (pre-Linux kernel v3.18), in the GPFS kernel NFS
support environment, GPFS may try to acquire some mutex, while
holding an inode environment, GPFS may try to acquire
some mutex, while holding an inode spin lock, which may be
detected as a soft lockup issue by the kernel NMI watchdog.

Local fix

  • 



Problem summary


    

  • On RHEL 7 nodes (pre-Linux kernel v3.18), in the GPFS kernel
NFS support environment, GPFS may try to acquire
some mutex, while holding an inode spin lock, which may be
detected as a soft lockup issue by the kernel NMI watchdog.

    



Problem conclusion


    

  • Benefits of the solution:

Avoid CPU stuck and performance impacts

Work around:

None

Problem trigger:

GPFS breaks a spin lock holding policy in NFS support
environment

Symptom:

Performance Impact/CPU stuck

Platforms affected:

All RHEL 7.x

Functional Area affected:

Users of KNFS/CNFS only

Customer Impact:

High Importance

    



Temporary fix


    

  • 



Comments


    

  • 



APAR Information




    

  • APAR number
    IJ21396
    • 

  • Reported component name
    SPEC SCALE STD
    • 

  • Reported component ID
    5737F33AP
    • 

  • Reported release
    504
    • 

  • Status
    CLOSED  PER
    • 

  • PE
    NoPE
    • 

  • HIPER
    NoHIPER
    • 

  • Special Attention
    NoSpecatt / Xsystem
    • 

  • Submitted date
    2019-12-04
    • 

  • Closed date
    2020-02-03
    • 

  • Last modified date
    2020-02-03
    • 





    

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

    
IJ21127
    

    • 

  • 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"},"Component":"","ARM Category":[],"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"504","Edition":"","Line of Business":{"code":"LOB26","label":"Storage"}}]
              

                                                                    

          
 
        

      

    

      

        

          

            
Document Information


            

            


                        

            Modified date:
            

            03 February 2020
            

            
                      

        


        

        


      

    

  



    

  

  
    
            

          
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