JDK-6818464 : TEST_BUG: java/util/Timer/KillThread.java failing intermittently
  • Type: Bug
  • Component: core-libs
  • Sub-Component: java.util
  • Affected Version: 7
  • Priority: P5
  • Status: Closed
  • Resolution: Fixed
  • OS: generic
  • CPU: generic
  • Submitted: 2009-03-17
  • Updated: 2013-12-17
  • Resolved: 2012-05-07
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JDK 7 JDK 8
7u21Fixed 8 b15Fixed
Related Reports
Relates :  
JDK-6776147 - java/util/Timer/KillThread.java fails in fastdebug with Exception: We failed silently on Solaris
Relates :  
JDK-7114125 - TEST_BUG: java/util/Timer/KillThread.java should use volatile cross thread variable declaration
Description
Tests with insufficient hardcoded timeouts that fail on slow machines (sparc) in slow configurations (Xcomp/server/fastdebug) as a result:

   java/util/Timer/KillThread.java
Comments
EVALUATION These timing bugs should be split into separate bugs. In the case of KillThread there appears to be a legitimate race condition in the test code that presumes 100 milliseconds will be sufficient to schedule and fire the initial TimerTask before the second schedule operation is attempted. This could be addressed with a local variable to ensure the firect operation is complete. In the second example for StoreDeadLock, the presumption is the external test harness will terminate the test if it does not complete in the expected timeframe. That can be handled simply by using the timefactor for the test harness as a whole.
07-11-2011
SUGGESTED FIX diff --git a/test/java/util/Timer/KillThread.java b/test/java/util/Timer/KillThread.java --- a/test/java/util/Timer/KillThread.java +++ b/test/java/util/Timer/KillThread.java @@ -31,19 +31,23 @@ import java.util.*; public class KillThread { + static boolean waiting = true ; public static void main (String[] args) throws Exception { Timer t = new Timer(); // Start a mean event that kills the timer thread t.schedule(new TimerTask() { public void run() { + waiting = false ; throw new ThreadDeath(); } }, 0); // Wait for mean event to do the deed and thread to die. try { + do { Thread.sleep(100); + } while(waiting); } catch(InterruptedException e) { }
07-11-2011