IBM Support

IV69509: HANG IN JAVA.UTIL.CONCURRENT.LOCKS.ABSTRACTQUEUEDSYNCHRONIZER.CONDITIONOBJECT.AWAITNANOS

Subscribe

You can track all active APARs for this component.

APAR status

  • Closed as program error.

Error description

  • Error Message: The JVM becomes unresponsive with low (but
    nonzero) CPU usage.
    .
    Stack Trace: 3XMTHREADINFO3           Java
    callstack:4XESTACKTRACE                at
    sun/misc/Unsafe.park(Native Method)4XESTACKTRACE
    at
    java/util/concurrent/locks/LockSupport.parkNanos(LockSupport.jav
    a:226)4XESTACKTRACE                at
    java/util/concurrent/locks/AbstractQueuedSynchronizer$ConditionO
    bject.awaitNanos(AbstractQueuedSynchronizer.java:2089(Compiled
    Code))Note that ConditionObject.awaitNanos is listed as
    "Compiled Code".
    .
    Only occurs on the Linux ia32 platform, and only with
    -Xshareclasses.  Another symptom of the same problem is that
    System.nanoTime can return an answer 1000x smaller than
    expected.
    

Local fix

  • -Xaot:disableInlining
    

Problem summary

  • AOT-compiled methods calling System.nanoTime could use a flawed
    algorithm that produced a result that is 1000x too small.  As a
    result, ConditionObject.awaitNanos would wait for 1000x longer
    than requested.
    

Problem conclusion

  • The JIT has been modified to call the correct nanoTime
    implementation.
    .
    This APAR will be fixed in the following Java Releases:
       8    SR1       (8.0.1.0)
       6 R1 SR8 FP4   (6.1.8.4)
       6    SR16 FP4  (6.0.16.4)
       7 R1 SR3       (7.1.3.0)
       7    SR9       (7.0.9.9)
    .
    Contact your IBM Product's Service Team for these Service
    Refreshes and Fix Packs.
    For those running stand-alone, information about the Service
    Refreshes and Fix Packs can be found at:
               https://www.ibm.com/developerworks/java/jdk/
    

Temporary fix

Comments

APAR Information

  • APAR number

    IV69509

  • Reported component name

    JIT

  • Reported component ID

    620700124

  • Reported release

    130

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2015-02-13

  • Closed date

    2015-02-23

  • Last modified date

    2018-02-26

  • 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



Document information

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

Software version: 130

Reference #: IV69509

Modified date: 26 February 2018