IBM Support

IV77449: CRASH OR INCORRECT BEHAVIOUR ON POWER PLATFORMS DUE TO AN INCORR ECTLY REMOVED LOAD INSTRUCTION

Subscribe to this APAR

By subscribing, you receive periodic emails alerting you to the status of the APAR, along with a link to the fix after it becomes available. You can track this item individually or track all items by product.

Notify me when this APAR changes.

Notify me when an APAR for this component changes.

 

APAR status

  • Closed as program error.

Error description

  • Error Message: This problem is only possible on POWER platforms
    running Java 7.1 builds that include IV76415.
    Under certain conditions in JIT compiled code a load instruction
    will be incorrectly removed during the optimization process and
    lead to crashes or incorrect behavior.
    .
    Stack Trace: N/A
    .
    

Local fix

  • This problem can be worked around by defining the following
    environment variable: TR_DisableLHSPeephole=<any value>. This
    workaround may incur a small performance penalty.
    

Problem summary

  • Under certain conditions in JIT compiled code a load instruction
    immediately following a store instruction will be incorrectly
    removed during the optimization process and lead to crashes or
    incorrect behavior. The store instruction must be a D-form
    instruction in order for this problem to manifest. In certain
    cases the load instruction will be replaced by an mr
    instruction, in others it will simply be deleted.
    

Problem conclusion

  • This problem is only possible on POWER platforms running Java
    7.1 builds that include IV76415. The JIT compiler has been fixed
    to avoid this problem.
    .
    This APAR will be fixed in the following Java Releases:
       8    SR2       (8.0.2.0)
       7 R1 SR3 FP20  (7.1.3.20)
    .
    Contact your IBM Product's Service Team for these Service
    Refreshes and Fix Packs.
    For those running stand-alone, information about the available
    Service Refreshes and Fix Packs can be found at:
               https://www.ibm.com/developerworks/java/jdk/
    

Temporary fix

Comments

APAR Information

  • APAR number

    IV77449

  • Reported component name

    JIT

  • Reported component ID

    620700124

  • Reported release

    130

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2015-09-24

  • Closed date

    2015-09-24

  • Last modified date

    2015-09-24

  • 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

  • R130 PSY

       UP

[{"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:
24 September 2015