IV20921: HANG IN A SINGLE APPLICATION THREAD WHILE ALL OTHER THREADS HAVE YIELDED

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APAR status

  • Closed as program error.

Error description

  • Error Message: The application hangs, i.e., no progress is made
    by the application, with no error message.
    .
    Stack Trace: N/A
    .
    

Local fix

  • -Xjit:disableAsyncCheckRemoval works around this problem but it
    may cause slight performance degradation.
    

Problem summary

  • This problem may occur when a trusted method (i.e., a method in
    String, HashMap, or TreeMap classes) that contains a loop is
    inlined in user code.  With low probability, the JIT generates a
    code for the user loop that doesn't have a GC point.
    Now if other threads are waiting for GC to happen, and the user
    code doesn't progress until something happens in the other
    threads, there will be a deadlock. In other words, GC is waiting
    for user loop which is waiting for other threads which are
    waiting for GC.
    

Problem conclusion

  • This defect will be fixed in:
    7.0.0 SR2
    6.0.0 SR11
    6.0.1 SR3
    5.0.0 SR14
    .
    The check that JIT uses to detect whether a loop has come from a
    trusted method has been made more accurate.
    

Temporary fix

Comments

APAR Information

  • APAR number

    IV20921

  • Reported component name

    JIT

  • Reported component ID

    620700124

  • Reported release

    260

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2012-05-10

  • Closed date

    2012-05-21

  • Last modified date

    2012-09-06

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

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

    IV20922

Fix information

  • Fixed component name

    JIT

  • Fixed component ID

    620700124

Applicable component levels

  • R260 PSY

       UP

  • R600 PSY

       UP



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Document information


More support for:

Runtimes for Java Technology
Just In Time (JIT) Compiler

Software version:

260

Reference #:

IV20921

Modified date:

2012-09-06

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