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IV13585: ENHANCE UDF_UNMOUNT SERIALIZATION APPLIES TO AIX 6100-05

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APAR status

  • Closed as program error.

Error description

  • When unmouting UDFS, system may crash in a small window
with the following stack:

(0)> f
pvthread+032D00 STACK:
[0000BC24].lock_write+000024 ()
[04719A44]RemoveFromLinkedList+000024 (??)
[04719148]addFree+000028 (??)
[04726544]udf_rele+00007C (??)
[0040A870]vnop_rele+000080 (??)
[0050724C]statfs64+0000F8 (??, ??)
[00003810].svc_instr+000110 ()
[kdb_get_memory] no real storage @ 2FF20C90
[100017E4]100017E4 ()

The udf_unmount thread can be seen as waiting for IO
completion.

(0)> f 896
pvthread+038000 STACK:
[00054CEC]e_block_thread+000278 ()
[000555F8]e_sleep_thread+00005C (??, ??, ??)
[04081B50]scsidisk_sleep+00004C (??, ??, ??)
[04068DFC]scsidisk_release_allow+000098 (??, ??)
[04073D34]scsidisk_close+000644 (??, ??, ??)
[003F6F28]devcclose+0001E8 (??, ??)
[003F7160]rdevclose+0000B8 (??, ??)
[004CDBAC]gno_close@AF15_2+000028 (??)
[00443AC8]closef+000060 (??)
[00443BD4]fp_close+00007C (??)
[0471BAE4]udf_unmount+000078 (??, ??, ??)
[0042D774]vfs_unmount+0000AC (??, ??, ??)
[0041B568]kunmount+000084 (??, ??, ??)
[0041BAEC]uvmount+00019C (??, ??)
[00003810].svc_instr+000110 ()
[kdb_get_memory] no real storage @ 2FF21E60
[1000047C]1000047C ()

Local fix

  • Do not run commands against UDFS while unmounting it.

Problem summary

  • When unmouting UDFS, system may crash in a small window
with the following stack:

(0)> f
pvthread+032D00 STACK:
 0000BC24 .lock_write+000024 ()
 04719A44 RemoveFromLinkedList+000024 (??)
 04719148 addFree+000028 (??)
 04726544 udf_rele+00007C (??)
 0040A870 vnop_rele+000080 (??)
 0050724C statfs64+0000F8 (??, ??)
 00003810 .svc_instr+000110 ()
 kdb_get_memory  no real storage @ 2FF20C90
 100017E4 100017E4 ()

The udf_unmount thread can be seen as waiting for IO
completion.

(0)> f 896
pvthread+038000 STACK:
 00054CEC e_block_thread+000278 ()
 000555F8 e_sleep_thread+00005C (??, ??, ??)
 04081B50 scsidisk_sleep+00004C (??, ??, ??)
 04068DFC scsidisk_release_allow+000098 (??, ??)
 04073D34 scsidisk_close+000644 (??, ??, ??)
 003F6F28 devcclose+0001E8 (??, ??)
 003F7160 rdevclose+0000B8 (??, ??)
 004CDBAC gno_close@AF15_2+000028 (??)
 00443AC8 closef+000060 (??)
 00443BD4 fp_close+00007C (??)
 0471BAE4 udf_unmount+000078 (??, ??, ??)
 0042D774 vfs_unmount+0000AC (??, ??, ??)
 0041B568 kunmount+000084 (??, ??, ??)
 0041BAEC uvmount+00019C (??, ??)
 00003810 .svc_instr+000110 ()
 kdb_get_memory  no real storage @ 2FF21E60
 1000047C 1000047C ()

Problem conclusion

  • Check for vfs_count before purging vnode cache and proceeding
with unmount

Temporary fix

  • 



Comments


    

  • 



APAR Information




    

  • APAR number
    IV13585
    • 

  • Reported component name
    AIX 610 STD EDI
    • 

  • Reported component ID
    5765G6200
    • 

  • Reported release
    610
    • 

  • Status
    CLOSED  PER
    • 

  • PE
    NoPE
    • 

  • HIPER
    NoHIPER
    • 

  • Submitted date
    2012-01-19
    • 

  • Closed date
    2012-01-19
    • 

  • Last modified date
    2013-02-27
    • 





    

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

    
IV07145
    

    • 

  • 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  U849764
       UP12/03/14  I  1000
    • 



PTF to Fileset Mapping








      
              
                            

              

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Document Information


            

            


                        

            Modified date:
            

            27 February 2013
            

            
                      

        


        

        


      

    

  



    

  

  
    
            

          
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