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IV45208: FLOATING POINT ERROR CRASH IN JIT COMPILED CODE

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APAR status

  • Closed as program error.

Error description

  • Error Message: Unhandled exception
    Type=Floating point error vmState=0x00000000
    J9Generic_Signal_Number=00000020 Signal_Number=00000008
    Error_Value=00000000 Signal_Code=00000000
    ...
    Compiled_method=java/lang/StringBuffer.getChars(II<OSB>CI)V
    .
    Stack Trace: N/A
    .
    Postmortem analysis shows that the PSW of the floating point
    error points immediately after a CRT instruction. This issue can
    only be observed on z/Linux.
    

Local fix

  • This issue can be worked around with the JVM option
    -Xjit:noResumableTrapHandler.  The use of this option may result
    in performance degradation of up to 5%.
    

Problem summary

  • The problem is caused by incorrect generation of compare and
    trap instructions for arraycopy related bound checks.  The JIT
    signal handler fails to recognize the trap error condition when
    the bound checks fail, resulting in the floating point error.
    

Problem conclusion

  • This defect will be fixed in:
    7.0.0 SR6
    6.0.1 SR7
    .
    The JIT compiler has been updated to generate the proper compare
    and trap instruction sequence.
    

Temporary fix

Comments

APAR Information

  • APAR number

    IV45208

  • Reported component name

    JIT

  • Reported component ID

    620700124

  • Reported release

    260

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2013-07-04

  • Closed date

    2013-07-15

  • Last modified date

    2013-07-15

  • 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

    JIT

  • Fixed component ID

    620700124

Applicable component levels

  • R260 PSY

       UP

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Document Information

Modified date:
15 July 2013