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IV19215: SEGMENTATION ERROR DURING JIT COMPILATION ON 32-BIT

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APAR status

  • Closed as program error.

Error description

  • Error Message: There are a number of possible error messages,
but what they have in common is:
- vmState begins with 0x0005
- There is a "Method_being_compiled"
- InaccessibleAddress starts with a series of "F"s.
Here is an example:
Unhandled exception
Type=Segmentation error vmState=0x00051dff
J9Generic_Signal_Number=00000004 Signal_Number=0000000b
Error_Value=00000000 Signal_Code=00000001
Handler1=559A570A Handler2=55A37AB7 InaccessibleAddress=FFFF5000
EDI=FFFF5000 ESI=0000EBBC EAX=00000000 EBX=5639C944
ECX=000036DC EDX=00000000
EIP=55653327 ES=002B DS=002B ESP=D943B988
EFlags=00010246 CS=0023 SS=002B EBP=D943BA68
Module=/lib/libc.so.6
Module_base_address=555DC000 Symbol=memset
Symbol_address=556532F0
Method_being_compiled=com/ibm/jtc/svt/tests/invoke/AsTypeTest.te
stConvertInt(I)V
Target=2_60_20110805_088344 (Linux 2.6.32.36-0.5-default)
CPU=x86 (8 logical CPUs) (0x3ed34c000 RAM)
.
Stack Trace: N/A
.

Local fix

  • 64-bit builds are far less likely to exhibit this problem, so if
switching to 64-bit is a viable option, that is very likely
(almost certain) to make the problem disappear.

Problem summary

  • The JIT's internal memory allocator doesn't properly handle the
situation where the address of allocated memory is right at the
top of the address space.  In that case, if an allocation
request is too large to accommodate, the calculations will
overflow, causing invalid pointers to be generated.

Problem conclusion

  • This defect will be fixed in:
7.0.0 SR1
6.0.1 SR2
WRT-V3 SR1
.
The JIT has been fixed to avoid overflow in the memory
allocation calculations.

Temporary fix

  • 



Comments


    

  • 



APAR Information




    

  • APAR number
    IV19215
    • 

  • Reported component name
    JIT
    • 

  • Reported component ID
    620700124
    • 

  • Reported release
    260
    • 

  • Status
    CLOSED  PER
    • 

  • PE
    NoPE
    • 

  • HIPER
    NoHIPER
    • 

  • Special Attention
    NoSpecatt
    • 

  • Submitted date
    2012-04-09
    • 

  • Closed date
    2012-04-09
    • 

  • Last modified date
    2012-05-20
    • 





    

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

    • 

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

    
IV21496
    

    • 



Fix information


    

  • Fixed component name
    JIT
    • 

  • Fixed component ID
    620700124
    • 



Applicable component levels


    

  • R260  PSY
       UP
    • 








      
              
                            

              

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Document Information


            

            


                        

            Modified date:
            

            20 May 2012
            

            
                      

        


        

        


      

    

  



    

  

  
    
            

          
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