IBM Support

IV97096: JAVA 1.8 PROCESS COREDUMP DUE TO EBB ILL INST WHEN TPROF IS RUN APPLIES TO AIX 7200-00

A fix is available

Obtain the fix for this APAR.

Subscribe

You can track all active APARs for this component.

 

APAR status

  • Closed as program error.

Error description

  • 1XHEXCPCODE    J9Generic_Signal_Number: 00000010
1XHEXCPCODE    Signal_Number: 00000004

IAR: 0000000000008624

Java 1.8 process coredump due to Illegal Instruction at
IAR '0x8624'. This happens when tprof event based is
used.
This happens because tprof -E is a global tool with
respect to PMSVCS and pmsvcs does not restore java?s
pmcontext
into CPU when global tool is running.

As pmcontext of java is not restored in to PMU
mmcr0[PMCC] bit is set ?00? revoking the access to mmcr0
register
in user space.
When Java process tries to access the mmcr0 via
?_write_mmcr0_addr? routine it gets ILL INSTRUCTION
EXCEPTION.

Local fix

  • power7 compat mode. OR
Also as a workaround you could even disable
RuntimeInstrumentation feature in IBM JAVA.
-XX:-RuntimeInstrumentation

Problem summary

  • 1XHEXCPCODE J9Generic_Signal_Number:
00000010
1XHEXCPCODE Signal_Number: 00000004

IAR: 0000000000008624

Java 1.8 process coredump due to
Illegal Instruction at IAR '0x8624'.
This happens when tprof event based
profiling is used.
This happens because tprof -E is a
global tool with respect to PMSVCS
and pmsvcs does not restore java   s
pmcontext into CPU when global tool
is running.

Problem conclusion

  • Added the code to restore the access of mmcr0
Register in user space even when global tool is
running

Temporary fix

  • 



Comments


    

  • 



APAR Information




    

  • APAR number
    IV97096
    • 

  • Reported component name
    AIX V7.2
    • 

  • Reported component ID
    5765CD200
    • 

  • Reported release
    720
    • 

  • Status
    CLOSED  PER
    • 

  • PE
    NoPE
    • 

  • HIPER
    NoHIPER
    • 

  • Submitted date
    2017-06-09
    • 

  • Closed date
    2017-06-09
    • 

  • Last modified date
    2017-10-05
    • 





    

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

    
IV96353
    

    • 

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

    • 



Fix information


    

  • Fixed component name
    AIX V7.2
    • 

  • Fixed component ID
    5765CD200
    • 



Applicable component levels


    

  • R720  PSY  U878415
       UP17/10/05  I  1000
    • 








      
              
                            

              

              [{"Business Unit":{"code":"BU058","label":"IBM Infrastructure w\/TPS"},"Product":{"code":"SSVEF8","label":"AIX 7.2 Enterprise Edition"},"Component":"","ARM Category":[],"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"720","Edition":"","Line of Business":{"code":"LOB08","label":"Cognitive Systems"}},{"Business Unit":{"code":"BU054","label":"Systems w\/TPS"},"Product":{"code":"SG11S","label":"AIX 7.2 HIPERS, APARs and Fixes"},"Component":"","ARM Category":[],"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"720","Edition":"","Line of Business":{"code":"","label":""}}]
              

                          

          
 
        

      

    

      

        

          

            
Document Information


            

            


                        

            Modified date:
            

            05 October 2017
            

            
                      

        


        

        


      

    

  



    

  

  
    
            

          
Page Feedback