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PM79159: Kernel panic on RHEL 6.3 while attempting to free root vfsmount structure after lookup of view-extended name

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You can track all active APARs for this component.

 

APAR status

  • Closed as program error.

Error description

  • A kernel panic may occur when building in IBM Rational ClearCase
dynamic views on Red Hat Enterprise Linux 6.3. The trace
follows:

Call Trace:
 [?ffffffff81169359?] free_percpu+0x99/0x140
 [?ffffffff8119a40e?] free_vfsmnt+0x2e/0x50
 [?ffffffff8119a4e7?] mntput_no_expire+0xb7/0x110
 [?ffffffff81188461?] path_put+0x31/0x40
 [?ffffffff8118ab7b?] path_walk+0x7b/0xe0
 [?ffffffff8118ad3b?] do_path_lookup+0x5b/0xa0
 [?ffffffff8118b9a7?] user_path_at+0x57/0xa0
 [?ffffffff81191f1f?] ? d_free+0x3f/0x60
 [?ffffffff811803b4?] ? cp_new_stat+0xe4/0x100
 [?ffffffff811805dc?] vfs_fstatat+0x3c/0x80
 [?ffffffff8118074b?] vfs_stat+0x1b/0x20
 [?ffffffff81180774?] sys_newstat+0x24/0x50
 [?ffffffff810d6b12?] ? audit_syscall_entry+0x272/0x2a0
 [?ffffffff8100b0f2?] system_call_fastpath+0x16/0x1b

Steps to reproduce: The conditions to reproduce this issue are
currently unknown.

Workaround: No known workaround.

Local fix

  • 



Problem summary


    

  • ****************************************************************
* USERS AFFECTED:                                              *
****************************************************************
* PROBLEM DESCRIPTION:                                         *
****************************************************************
* RECOMMENDATION:                                              *
****************************************************************
A Linux system might encounter a kernel panic in
free_vfsmount during a lookup of an MVFS file.

    



Problem conclusion


    

  • This problem was resolved in 7.1.2.09 and 8.0.0.05 by the
fix for PM64312.

    



Temporary fix


    

  • 



Comments


    

  • 



APAR Information




    

  • APAR number
    PM79159
    • 

  • Reported component name
    CLEARCASE UNIX
    • 

  • Reported component ID
    5724G2901
    • 

  • Reported release
    712
    • 

  • Status
    CLOSED  PER
    • 

  • PE
    NoPE
    • 

  • HIPER
    NoHIPER
    • 

  • Special Attention
    NoSpecatt
    • 

  • Submitted date
    2012-12-13
    • 

  • Closed date
    2013-04-11
    • 

  • Last modified date
    2013-04-11
    • 





    

  • 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
    CLEARCASE UNIX
    • 

  • Fixed component ID
    5724G2901
    • 



Applicable component levels


    

  • R712  PSN
       UP
    • 








      
              
                            

              

              [{"Business Unit":{"code":"BU053","label":"Cloud & Data Platform"},"Product":{"code":"SSSH27","label":"Rational ClearCase"},"Component":"","ARM Category":[],"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"7.1.2","Edition":"","Line of Business":{"code":"LOB45","label":"Automation"}}]
              

                                                                    

          
 
        

      

    

      

        

          

            
Document Information


            

            


                        

            Modified date:
            

            11 April 2013
            

            
                      

        


        

        


      

    

  



    

  

  
    
            

          
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