IZ61357: INTERMITTENT JAVA CRASH IN COMPILED CODE WITH HEAVY WORKLOAD DUE TO UNINITIALIZED STACK SLOT

Subscribe

You can track all active APARs for this component.

APAR status

  • Closed as program error.

Error description

  • Error Message: A GPF/SIGSEGV is received when a compiled Java
    method is executed that contains loops (or calls to methods
    containing loops). The method is likely to be hot (frequently
    executed) and heavily optimized. The direct cause of the
    crash is an attempt to dereference a pointer that has been
    loaded from a stack slot that was not initialized.
    .
    Stack Trace: N/A
    .
    

Local fix

  • The issue can be avoided with the -Xjit:disableLoopVersioner
    option. However, this can cause significant (2% to 10%) impact
    on performance.
    

Problem summary

  • The JIT compiler contained a loop optimization bug which could
    lose variable updates in a loop in the generated code.
    

Problem conclusion

  • This defect will be fixed in:
    5.0.0 SR11
    .
    The JIT compiler has been modified to correct the problem.
    .
    To obtain the fix:
    Install build 20090928 or later
    

Temporary fix

Comments

APAR Information

  • APAR number

    IZ61357

  • 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

    2009-09-24

  • Closed date

    2009-12-16

  • Last modified date

    2009-12-16

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

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

    IZ61639

Fix information

  • Fixed component name

    JAVA 5 JIT

  • Fixed component ID

    620500124

Applicable component levels

  • R500 PSN

       UP



Rate this page:

(0 users)Average rating

Add comments

Document information


More support for:

Runtimes for Java Technology
Just In Time (JIT) Compiler

Software version:

5.0

Reference #:

IZ61357

Modified date:

2009-12-16

Translate my page

Machine Translation

Content navigation