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


More support for:

Runtimes for Java Technology
Just In Time (JIT) Compiler

Software version:

260

Reference #:

IV19215

Modified date:

2012-05-20

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