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IZ96501: UMOUNT AND SYNCD DEADLOCKED FOR PGBUFS APPLIES TO AIX 6100-06

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APAR status

  • Closed as program error.

Error description

  • Customer file system unmount hangs with the following
stack trace:
(0)> f
pvthread+03C200 STACK:
[0005DFB0]e_block_thread+000290 ()
[002EF51C]bmInodeWrite@AF119_67+00017C (??, ??, ??, ??,
??, ??, ??, ??)
[002EC460]bmInodeWrite+000040 (??)
[00338ABC]diSync+00007C (??)
[002F5674]quiesceFSReportTmp+0000F4 (??, ??, ??)
[0046BB98]j2_umount+000AB8 (??, ??, ??)
[00535C6C]vfs_unmount+00008C (??, ??, ??)
[005334A8]kunmount+0001C8 (??, ??, ??)
[00533E68]uvmount+000208 (??, ??)

In addition, the syncd kernel thread is sleeping
with the following stack trace:
(0)> f 139
pvthread+008B00 STACK:
[0005DFB0]e_block_thread+000290 ()
[002EE3DC]bmAssign+0006DC (??, ??, ??, ??, ??, ??)
[002F45BC]writeSuperblock+00007C (??, ??)
[002F4408]updateSuperblock+000088 (??, ??)
[002F2FFC]markFilesystemException+00005C (??, ??, ??)
[00356F54]lmLogException+0000F4 (??, ??, ??)
[00357454]lmGroupCommit+000314 (??, ??)
[0030D580]txCommit+0008C0 (??, ??, ??, ??)
[002F59C4]iWriteLogToDiskAll+000124 ()
[002D5740]iSyncdAll+0000C0 ()
[002F5E34]j2_syncvfs@AF46_10+0000F4 (??, ??, ??, ??, ??)
[005355C4]vfs_syncvfs+000044 (??, ??, ??, ??)
[00534BA4]syncvfs+000244 (??, ??)
[00003844].svc_instr+000144 ()

Local fix

  • Reboot the system as soon as possible as there is a
danger for file system corruption and lost data since
the sync daemon is hung.

Problem summary

  • JFS2 deadlock between two threads with following stack traces

Threead:1
---------
JFS2 file system unmount hangs with the following
stack trace:
(0)> f
pvthread+03C200 STACK:
 0005DFB0 e_block_thread+000290 ()
 002EF51C bmInodeWrite@AF119_67+00017C
 002EC460 bmInodeWrite+000040
 00338ABC diSync+00007C
 002F5674 quiesceFSReportTmp+0000F4
 0046BB98 j2_umount+000AB8
 00535C6C vfs_unmount+00008C
 005334A8 kunmount+0001C8
 00533E68 uvmount+000208

Thread 2:
----------
In addition, the syncd kernel thread is sleeping
with the following stack trace:
(0)> f 139
pvthread+008B00 STACK:
 0005DFB0 e_block_thread+000290 ()
 002EE3DC bmAssign+0006DC
 002F45BC writeSuperblock+00007C
 002F4408 updateSuperblock+000088
 002F2FFC markFilesystemException+00005C
 00356F54 lmLogException+0000F4
 00357454 lmGroupCommit+000314
 0030D580 txCommit+0008C0
 002F59C4 iWriteLogToDiskAll+000124 ()
 002D5740 iSyncdAll+0000C0 ()
 002F5E34 j2_syncvfs@AF46_10+0000F4
 005355C4 vfs_syncvfs+000044
 00534BA4 syncvfs+000244
 00003844 .svc_instr+000144 ()

Problem conclusion

  • 0 rialize quiesceFSReportTmp() with sync

Temporary fix

  • 



Comments


    

  • 



APAR Information




    

  • APAR number
    IZ96501
    • 

  • Reported component name
    AIX 610 STD EDI
    • 

  • Reported component ID
    5765G6200
    • 

  • Reported release
    610
    • 

  • Status
    CLOSED  PER
    • 

  • PE
    NoPE
    • 

  • HIPER
    NoHIPER
    • 

  • Submitted date
    2011-03-09
    • 

  • Closed date
    2011-04-26
    • 

  • Last modified date
    2013-02-21
    • 





    

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

    • 

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

    
IV04928
    

    • 



Fix information


    

  • Fixed component name
    AIX 610 STD EDI
    • 

  • Fixed component ID
    5765G6200
    • 



Applicable component levels


    

  • R610  PSY  U843098
       UP11/10/15  I  1000
    • 



PTF to Fileset Mapping








      
              
                            

              

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Document Information


            

            


                        

            Modified date:
            

            21 February 2013
            

            
                      

        


        

        


      

    

  



    

  

  
    
            

          
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