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

PI37003: Ship Java 8 + IV69417 + IV69419 + IV69509 + IV70681 for WAS 8555

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 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

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