IBM Support

IV82849: HANG DUE TO JIT COMPILATION THREAD OMITTING TO SEND A NOTIFICATI ON SIGNAL WHEN COMPILATION ENDS

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APAR status

  • Closed as program error.

Error description

  • Error Message: N/A
    .
    Stack Trace: N/A
    .
    A javacore for the hung process will show an application thread
    waiting to be notified on a JIT-QueueSlotMonitor.
    E.g.:
    2LKREGMON          JIT-QueueSlotMonitor-1353 lock
    (0x00007F4058189C80): <unowned>
    3LKNOTIFYQ            Waiting to be notified:
    3LKWAITNOTIFY            "Pooled Thread #71 running
    gnu.testlet.java.util.AbstractMap.AcuniaAbstractMapTest"
    (J9VMThread:0x00007F4200311400)
    

Local fix

Problem summary

  • Under some circumstances an application thread may request a
    synchronous re-compilation to be performed and thus, the thread
    is going to wait for the compilation to finish before
    continuing. In some rare cases the JIT compilation thread may
    omit to send a notification when the compilation is over
    resulting in the waiting thread being blocked forever.
    

Problem conclusion

  • The code has been changed to send the notification signal to the
    waiting thread.
    .
    This APAR will be fixed in the following Java Releases:
       8    SR3       (8.0.3.0)
       7 R1 SR3 FP40  (7.1.3.40)
       7    SR9 FP40  (7.0.9.40)
       6 R1 SR8 FP25  (6.1.8.25)
    .
    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

    IV82849

  • Reported component name

    JIT

  • Reported component ID

    620700124

  • Reported release

    130

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2016-03-21

  • Closed date

    2016-03-21

  • Last modified date

    2016-03-21

  • 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

  • R260 PSY

       UP



Document information

More support for: Runtimes for Java Technology
Just In Time (JIT) Compiler

Software version: 130

Reference #: IV82849

Modified date: 21 March 2016