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IJ11116: ILLEGAL LOCR INSTRUCTION ON Z10

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APAR status

  • Closed as program error.

Error description

  • Error Message: The JRE reports the following error message
    Type=Illegal instruction vmState=0x00000000
    .
    Stack Trace: N/A
    .
    This problem can only happen on IBM Z on z10 machines
    

Local fix

  • This problem can be avoided using the following command line
    option:
    -Xjit:disableMaxMinOptimization
    

Problem summary

  • The JIT compiler has an optimized version of the max/min
    operation which uses the LOCR instruction which is not available
    on z10. A guard was missing for this operation so it was
    possible for the JIT compiler to generate on LOCR on z10 which
    results in an illegal instruction exception when executed.
    

Problem conclusion

Temporary fix

Comments

APAR Information

  • APAR number

    IJ11116

  • Reported component name

    JIT

  • Reported component ID

    620700124

  • Reported release

    130

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2018-11-06

  • Closed date

    2018-11-06

  • Last modified date

    2018-11-06

  • 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

[{"Business Unit":{"code":"BU048","label":"IBM Software"},"Product":{"code":"SSC9HBA","label":"Just In Time (JIT) Compiler"},"Component":"","ARM Category":[],"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"130","Edition":"","Line of Business":{"code":"","label":""}}]

Document Information

Modified date:
06 November 2018