IZ68010: 64-BIT ZLINUX/ZOS JAVA CRASH IN SYSTEM.ARRAYCOPY

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You can track all active APARs for this component.

APAR status

  • Closed as program error.

Error description

  • Error Message: A SIGSEGV/ABEND is raised when a JIT-compiled
    Java method attempts to call System.arraycopy with an unusual
    length or array index. The number has just been incremented from
    -1 to 0.
    The problem may also manifest itself as a crash in other
    locations, or incorrect computation involving a mixture of ints
    and longs.
    The problem only affects 64-bit 390, on both z/Linux and z/OS.
    .
    Stack Trace: N/A
    .
    

Local fix

  • This issue can be avoided by setting the environment variable
    TR_NRECORDLGFR=1 before launching the JVM.
    

Problem summary

  • The problem is caused when a 32-bit (int) value is sign-extended
    and assigned to a 64-bit (long) global register, which is later
    clobbered by an int operation, and then finally used for a long
    operation again. Under some circumstances, the JIT compiler may
    optimize away the required sign extension incorrectly.
    

Problem conclusion

  • This defect will be fixed in:
    6.0.0 SR8
    5.0.0 SR12
    .
    The JIT compiler has been updated to correct the optimization.
    .
    To obtain the fix:
    Install build 20100126 or later
    

Temporary fix

Comments

APAR Information

  • APAR number

    IZ68010

  • Reported component name

    JAVA 5 JIT

  • Reported component ID

    620500124

  • Reported release

    500

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2010-01-16

  • Closed date

    2010-01-26

  • Last modified date

    2010-07-22

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

    IZ68006

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

Fix information

  • Fixed component name

    JAVA 5 JIT

  • Fixed component ID

    620500124

Applicable component levels

  • R500 PSN

       UP



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Document information


More support for:

Runtimes for Java Technology
Just In Time (JIT) Compiler

Software version:

5.0

Reference #:

IZ68010

Modified date:

2010-07-22

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