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IT34195: ASSERT FAILURE OR HANG POSSIBLE ON PRIMARY SERVER WHEN USING CDCAND HDR SECONDARY SERVER

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APAR status

  • Closed as program error.

Error description

  • An Informix server using 14.10.FC4W1 with CDC sessions and a
connected HDR secondary server may experience an Assert Failure
or hang and become unresponsive. The affected thread will be the
dr_prsend thread which communicates with the HDR secondary. An
example of the stack in the Assert Failure:

Stack for thread: 221163 dr_prsend

afstack
mt_ex_throw_sig
afsig_handler
mt_wakeup_expedite_haslock
mt_wakeup_expedite_haslock
mt_wakeup_expedite
cdrLSNQ_wakup
cdrlsn_skiplist_remove
cdrLSNQ_SetLSN@AF10_6
hdrSetLPG
dr_primary_send
dr_session_thread
startup

If a hang occurs then same dr_prsend thread may be seen in a
constantly running state. Using a command such as pstack or
procstack to obtain the stack of the CPU VP oninit process on
which the dr_prsend thread runs may show a stack similar to:

__fd_poll
mt_nap_int
mt_spin_lock_wait
cdrLSNQ_wakup
cdrlsn_skiplist_remove
cdrLSNQ_SetLSN@AF10_6
hdrSetLPG
dr_primary_send
dr_session_thread
startup
system

In both cases a restart of the primary server will be required.

Local fix

  • 



Problem summary


    

  • ****************************************************************
* USERS AFFECTED:                                              *
* Users of Informix Server prior to 12.10.xC15 and 14.10.xC5.  *
****************************************************************
* PROBLEM DESCRIPTION:                                         *
* See Error Description                                        *
****************************************************************
* RECOMMENDATION:                                              *
* Upgrade to Informix Server 12.10.xC15 (when available) or    *
* 14.10.xC5.                                                   *
****************************************************************

    



Problem conclusion


    

  • Fixed in Informix Server 12.10.xC15 and 14.10.xC5.

    



Temporary fix


    

  • 



Comments


    

  • 



APAR Information




    

  • APAR number
    IT34195
    • 

  • Reported component name
    INFORMIX SERVER
    • 

  • Reported component ID
    5725A3900
    • 

  • Reported release
    E10
    • 

  • Status
    CLOSED  PER
    • 

  • PE
    NoPE
    • 

  • HIPER
    NoHIPER
    • 

  • Special Attention
    NoSpecatt / Xsystem
    • 

  • Submitted date
    2020-09-13
    • 

  • Closed date
    2020-12-09
    • 

  • Last modified date
    2020-12-09
    • 





    

  • 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
    INFORMIX SERVER
    • 

  • Fixed component ID
    5725A3900
    • 



Applicable component levels


    








      
              
                            

              

              [{"Line of Business":{"code":"LOB10","label":"Data and AI"},"Business Unit":{"code":"BU053","label":"Cloud & Data Platform"},"Product":{"code":"SSGU8G","label":"Informix Servers"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"E10"}]
              

                          

          
 
        

      

    

      

        

          

            
Document Information


            

            


                        

            Modified date:
            

            10 December 2020
            

            
                      

        


        

        


      

    

  



    

  

  
    
            

          
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