IBM Support

IT34066: SET EXPLAIN OFF CAN CAUSE ASSERT FAIL CALLING MT_AIO_FCLOSE FROMSETEXPLAIN

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APAR status

  • Closed as program error.

Error description

  • Shortly after bringing the server on-line, it's possible for the
server to assert with a stack like below when
running set explain off.

0x00000000014e501d (oninit) afstack
0x00000000014eabe1 (oninit) mt_ex_throw_sig
0x00000000014f8d68 (oninit) afsig_handler
0x00007fa64fe205e0 (Linux) <signal frame>
0x00000000014cc299 (oninit) mt_aio_fclose
0x0000000000646a84 (oninit) setexplain
0x00000000007502de (oninit) aud_setexplain
0x0000000000640bd7 (oninit) excommand
0x0000000000af260b (oninit) sq_execute_workhorse
0x0000000000af2e4d (oninit) sq_execute
0x0000000000bc655e (oninit) sqmain
0x0000000001613a7a (oninit) spawn_thread
0x00000000014d5cf2 (oninit) th_init_initgls
0x000000000151c00f (oninit) startup

The problem has a generally reliable reproduction, but after it
asserts for the first time on a cpu vp
it seems to no longer reproduce.

Local fix

  • Setting the following onconfig parameter may work around the
problem:

STMT_CACHE_QUERY_PLAN 0

Problem summary

  • ****************************************************************
* USERS AFFECTED:                                              *
* Users of Informix Server prior to 14.10.xC5.                 *
****************************************************************
* PROBLEM DESCRIPTION:                                         *
* See Error Description                                        *
****************************************************************
* RECOMMENDATION:                                              *
* Update to Informix Server 14.10.xC5.                         *
****************************************************************

Problem conclusion

  • Fixed in Informix Server 14.10.xC5.

Temporary fix

  • 



Comments


    

  • 



APAR Information




    

  • APAR number
    IT34066
    • 

  • 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
    2020-08-31
    • 

  • Closed date
    2020-12-07
    • 

  • Last modified date
    2020-12-07
    • 





    

  • 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":null,"label":null},"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:
            

            08 December 2020
            

            
                      

        


        

        


      

    

  



    

  

  
    
            

          
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