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IZ97383: UPT:SHEMP02: XM_READ_FREE AT NFS4_RECOVER_REVOKED_STATE+4C APPLIES TO AIX 6100-06

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APAR status

  • Closed as program error.

Error description

  • the nfs v4 machine crash with following stack trace
pvthread+33CD00 STACK:
￭00022080abend_trap+000000 ()
￭06D72BC0dnlc_lookup+0002E0 (??, ??, ??)
￭06CFC5C0nfs4lookup+0001A0 (??, ??, ??, ??)
￭06CF6B88nfs4_lookup+0000A8 (??, ??, ??, ??, ??, ??)
￭005E95B4vnop_lookup+0001D4 (??, ??, ??, ??, ??, ??)
￭005AA758lookuppn+000918 (??, ??, ??, ??, ??, ??, ??, ??)
￭006E9038kunlinkat+000338 (FFFFFFFEFFFFFFFE, 000000002FF19E10,
0000000000000000, 0000000000000000)
￭0000386Covlya_addr_sc_flih_main+00014C ()
￭kdb_get_virtual_memory no real storage @ 2FF18988
￭100016E4100016E4 ()
￭kdb_read_mem no real storage @ FFFFFFFFFFF5D00

or the machine has an error entry about XM_READ_FREE.
and the stack trace for it will be
nfs4_recover_revoked_state+4C
nfs4write+8B8
nfs4_write+5EC
nfs4_rdwr+1D0
nfs4_rdwr_attr+12C
vnop_rdwr+1A8
vno_rw+B4
fp_rwuio+2D4
rw_request+238
process_request+1F8
process_queue+50
do_requests+44
server_main+23C
procentry+10

or

nfs4_recover_revoked_state+4C
nfs4read+684
nfs4_bio+9C8
do_async_op+158
nfs_async_start+2EC
threadentry+54

the r_deleg_count will be -1 and the vnode's
v_count is 1 less than what it should be

Local fix

  • 



Problem summary


    

  • the nfs v4 machine crash with following stack trace
pvthread+33CD00 STACK:
 00022080 abend_trap+000000 ()
 06D72BC0 dnlc_lookup+0002E0 (??, ??, ??)
 06CFC5C0 nfs4lookup+0001A0 (??, ??, ??, ??)
 06CF6B88 nfs4_lookup+0000A8 (??, ??, ??, ??, ??, ??)
 005E95B4 vnop_lookup+0001D4 (??, ??, ??, ??, ??, ??)
 005AA758 lookuppn+000918 (??, ??, ??, ??, ??, ??, ??, ??)
 006E9038 kunlinkat+000338 (FFFFFFFEFFFFFFFE, 000000002FF19E10,
0000000000000000, 0000000000000000)
 0000386C ovlya_addr_sc_flih_main+00014C ()
 kdb_get_virtual_memory  no real storage @ 2FF18988
 100016E4 100016E4 ()
 kdb_read_mem  no real storage @ FFFFFFFFFFF5D00
.
or the machine has an error entry about XM_READ_FREE.
and the stack trace for it will be
nfs4_recover_revoked_state+4C
nfs4write+8B8
nfs4_write+5EC
nfs4_rdwr+1D0
nfs4_rdwr_attr+12C
vnop_rdwr+1A8
vno_rw+B4
fp_rwuio+2D4
rw_request+238
process_request+1F8
process_queue+50
do_requests+44
server_main+23C
procentry+10
.
or
.
nfs4_recover_revoked_state+4C
nfs4read+684
nfs4_bio+9C8
do_async_op+158
nfs_async_start+2EC
threadentry+54
.
the r_deleg_count will be -1 and the vnode's
v_count is 1 less than what it should be

    



Problem conclusion


    

  • make sure that we re-fetch the dsp after we re-obtained the
state change.

    



Temporary fix


    

  • 



Comments


    

  • 6100-04 - use AIX APAR IZ97621
6100-05 - use AIX APAR IZ97526
6100-06 - use AIX APAR IZ97383
7100-00 - use AIX APAR IZ97414

    



APAR Information




    

  • APAR number
    IZ97383
    • 

  • Reported component name
    AIX 610 STD EDI
    • 

  • Reported component ID
    5765G6200
    • 

  • Reported release
    610
    • 

  • Status
    CLOSED  PER
    • 

  • PE
    NoPE
    • 

  • HIPER
    NoHIPER
    • 

  • Submitted date
    2011-03-28
    • 

  • Closed date
    2011-03-28
    • 

  • Last modified date
    2013-04-16
    • 





    

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

    
IZ97204
    

    • 

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

    • 



Fix information


    

  • Fixed component name
    AIX 610 STD EDI
    • 

  • Fixed component ID
    5765G6200
    • 



Applicable component levels


    

  • R610  PSY  U835918
       UP11/05/10  I  1000
    • 



PTF to Fileset Mapping








      
              
                            

              

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Document Information


            

            


                        

            Modified date:
            

            16 April 2013
            

            
                      

        


        

        


      

    

  



    

  

  
    
            

          
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