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IV46875: AIX NFSV3 SERVER CRASHES IN LOCKFH_WALK_VNODES()

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APAR status

  • Closed as program error.

Error description

  • AIX NFSv3 server could crash with the following stack:

(17)> f
pvthread+2AC300 STACK:
[04B37D60]lockfh_walk_vnodes@AF80_7+000080
(0000000000000000, 496E616374697661 [??])
[0076BE90]vn_search+000090 (??, ??, ??)
[00014F50].kernel_add_gate_cstack+000030 ()
[04B37C70]lockfh_walk_vfs@AF79_8+000030 (??, ??)
[0076CFB4]vfs_search+000094 (??, ??)
[00014F50].kernel_add_gate_cstack+000030 ()
[04B37BE4]unlock_lockmgr_granted@AF78_55+000024 (??, ??)
[04B43688]lm_unlock_client+0000E8 (??)
[04B45554]lm_free_all+000054 (??, ??, ??, ??)
[04B48538]lm_nlm4_dispatch+000438 (??, ??)
[049A0C78]svc_getreq+0009B8 (??)
[0024AD9C]threadentry+00005C (??, ??, ??, ??)
[kdb_read_mem] no real storage @ FFFFFFFFFFF95E0

Mostly seen with non-UNIX NFS clients or clients that
rely on the NLMPROC4_FREE_ALL call.

Local fix

  • 



Problem summary


    

  • AIX NFS server may crash, If NFS clients make NLMPROC4_FREE_ALL
call to release all locks.

    



Problem conclusion


    

  • vnode list travarsal is bypassed if vfs type is MNT_PROCFS,
MNT_AHAFS, MNT_UDF, MNT_CDROM. We should not go ahead and
search for VNODEs on these VFS types.

    



Temporary fix


    

  • 



Comments


    

  • 



APAR Information




    

  • APAR number
    IV46875
    • 

  • Reported component name
    AIX 610 STD EDI
    • 

  • Reported component ID
    5765G6200
    • 

  • Reported release
    610
    • 

  • Status
    CLOSED  PER
    • 

  • PE
    NoPE
    • 

  • HIPER
    NoHIPER
    • 

  • Submitted date
    2013-08-11
    • 

  • Closed date
    2013-09-18
    • 

  • Last modified date
    2014-03-31
    • 






Fix information


    

  • Fixed component name
    AIX 610 STD EDI
    • 

  • Fixed component ID
    5765G6200
    • 



Applicable component levels


    

  • R610  PSY
       UP
    • 








      
              
                            

              

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Document Information


            

            


                        

            Modified date:
            

            31 March 2014
            

            
                      

        


        

        


      

    

  



    

  

  
    
            

          
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