RFR for JDK-8025198 Intermittent test failure: java/util/concurrent/ThreadPoolExecutor/ThrowingTasks.java
David Holmes
david.holmes at oracle.com
Mon Nov 4 06:59:28 UTC 2013
On 4/11/2013 4:40 PM, Martin Buchholz wrote:
> David and I might prefer a fix using AtomicInteger, but I don't think
> there's anything incorrect with your fix - approved. Especially if you
> have seen the flakiness has gone away. (I've never seen this test fail.)
+1
David
>
> On Sun, Nov 3, 2013 at 8:14 PM, Tristan Yan <tristan.yan at oracle.com> wrote:
>
>> Thank you Martin
>> I updated the code as below
>>
>> http://cr.openjdk.java.net/~ewang/tristan/JDK-8025198/webrev.02/
>> Thank you
>>
>>
>>
>> On 11/04/2013 11:38 AM, Martin Buchholz wrote:
>>
>> Tristan, I think your change it correct.
>> There are some stylistic improvements I would make:
>> - make lock final
>> - make lessThanCorePoolSize "blank final"; final boolean
>> lessThanCorePoolSize;
>> - add spaces after // and before {
>>
>>
>> On Sun, Nov 3, 2013 at 4:49 PM, Tristan Yan <tristan.yan at oracle.com>wrote:
>>
>>> Thank you Martin
>>> I had code change. I took the similar way as you do here.
>>>
>>> Please review the code change for JDK-8025198.
>>> Description:
>>> Race condition exists in the test ThrowingTasks.java. We should sync
>>> CountDownLatch.countDown and CountDownLatch.getCount.
>>>
>>>
>>> http://cr.openjdk.java.net/~ewang/tristan/JDK-8025198/webrev.01/test/java/util/concurrent/ThreadPoolExecutor/ThrowingTasks.java.sdiff.html
>>>
>>> Thank you
>>> Tristan
>>>
>>>
>>>
>>> On 11/03/2013 12:46 PM, Martin Buchholz wrote:
>>>
>>> I think the author of this test was sleep-deprived by baby Tristan back
>>> in 2007.[image: Inline image 1]
>>>
>>> I tried and failed to find a single synchronizer that properly does
>>> what we are trying to do with allStarted here. Too bad
>>> CountDownLatch.countDown doesn't return the count. Best to introduce
>>> another synchronizer. I propose this fix:
>>>
>>> diff --git
>>> a/test/java/util/concurrent/ThreadPoolExecutor/ThrowingTasks.java
>>> b/test/java/util/concurrent/ThreadPoolExecutor/ThrowingTasks.java
>>> --- a/test/java/util/concurrent/ThreadPoolExecutor/ThrowingTasks.java
>>> +++ b/test/java/util/concurrent/ThreadPoolExecutor/ThrowingTasks.java
>>> @@ -136,6 +136,7 @@
>>> }
>>>
>>> static final CountDownLatch allStarted = new
>>> CountDownLatch(flakes.size());
>>> + static final AtomicInteger taskSerial = new AtomicInteger(0);
>>> static final CountDownLatch allContinue = new CountDownLatch(1);
>>>
>>> static class PermissiveSecurityManger extends SecurityManager {
>>> @@ -164,7 +165,8 @@
>>> }
>>> @Override protected void beforeExecute(Thread t, Runnable r) {
>>> allStarted.countDown();
>>> - if (allStarted.getCount() < getCorePoolSize())
>>> + // Get last core pool cohort to start in unison
>>> + if (flakes.size() - taskSerial.incrementAndGet() <
>>> getCorePoolSize())
>>> try { allContinue.await(); }
>>> catch (InterruptedException x) { unexpected(x); }
>>> beforeExecuteCount.getAndIncrement();
>>>
>>>
>>>
>>> On Fri, Nov 1, 2013 at 6:48 PM, Tristan Yan <tristan.yan at oracle.com>wrote:
>>>
>>>> This only happened when I tried a 1000 times loop run, see the jstack
>>>> out put below:
>>>> Also by using jmap/jhat, below values help me find the reason
>>>> flakes.size() = 25
>>>> allStarted.state = 1
>>>> beforeExecuteCount.count = 1
>>>>
>>>> Full thread dump Java HotSpot(TM) 64-Bit Server VM (25.0-b56 mixed mode):
>>>>
>>>> "Attach Listener" #32 daemon prio=9 os_prio=31 tid=0x00007faf1d808000
>>>> nid=0x390b waiting on condition [0x0000000000000000]
>>>> java.lang.Thread.State: RUNNABLE
>>>>
>>>> "Thread-22" #31 prio=5 os_prio=31 tid=0x00007faf1d07b000 nid=0x5d0b
>>>> waiting on condition [0x000000019b530000]
>>>> java.lang.Thread.State: WAITING (parking)
>>>> at sun.misc.Unsafe.park(Native Method)
>>>> - parking to wait for <0x00000001683e9610> (a
>>>> java.util.concurrent.CountDownLatch$Sync)
>>>> at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
>>>> at
>>>> java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:836)
>>>> at
>>>> java.util.concurrent.locks.AbstractQueuedSynchronizer.doAcquireSharedInterruptibly(AbstractQueuedSynchronizer.java:997)
>>>> at
>>>> java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireSharedInterruptibly(AbstractQueuedSynchronizer.java:1304)
>>>> at java.util.concurrent.CountDownLatch.await(CountDownLatch.java:231)
>>>> at
>>>> ThrowingTasks$CheckingExecutor.beforeExecute(ThrowingTasks.java:168)
>>>> at
>>>> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1139)
>>>> at
>>>> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
>>>> at java.lang.Thread.run(Thread.java:744)
>>>>
>>>> "Thread-21" #30 prio=5 os_prio=31 tid=0x00007faf1d80c800 nid=0x5507
>>>> waiting on condition [0x000000019ae1b000]
>>>> java.lang.Thread.State: WAITING (parking)
>>>> at sun.misc.Unsafe.park(Native Method)
>>>> - parking to wait for <0x00000001683e9610> (a
>>>> java.util.concurrent.CountDownLatch$Sync)
>>>> at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
>>>> at
>>>> java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:836)
>>>> at
>>>> java.util.concurrent.locks.AbstractQueuedSynchronizer.doAcquireSharedInterruptibly(AbstractQueuedSynchronizer.java:997)
>>>> at
>>>> java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireSharedInterruptibly(AbstractQueuedSynchronizer.java:1304)
>>>> at java.util.concurrent.CountDownLatch.await(CountDownLatch.java:231)
>>>> at
>>>> ThrowingTasks$CheckingExecutor.beforeExecute(ThrowingTasks.java:168)
>>>> at
>>>> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1139)
>>>> at
>>>> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
>>>> at java.lang.Thread.run(Thread.java:744)
>>>>
>>>> "Thread-20" #29 prio=5 os_prio=31 tid=0x00007faf1c10b000 nid=0x6307
>>>> waiting on condition [0x000000019b227000]
>>>> java.lang.Thread.State: WAITING (parking)
>>>> at sun.misc.Unsafe.park(Native Method)
>>>> - parking to wait for <0x00000001683e9610> (a
>>>> java.util.concurrent.CountDownLatch$Sync)
>>>> at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
>>>> at
>>>> java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:836)
>>>> at
>>>> java.util.concurrent.locks.AbstractQueuedSynchronizer.doAcquireSharedInterruptibly(AbstractQueuedSynchronizer.java:997)
>>>> at
>>>> java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireSharedInterruptibly(AbstractQueuedSynchronizer.java:1304)
>>>> at java.util.concurrent.CountDownLatch.await(CountDownLatch.java:231)
>>>> at
>>>> ThrowingTasks$CheckingExecutor.beforeExecute(ThrowingTasks.java:168)
>>>> at
>>>> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1139)
>>>> at
>>>> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
>>>> at java.lang.Thread.run(Thread.java:744)
>>>>
>>>> "Thread-18" #27 prio=5 os_prio=31 tid=0x00007faf1c10a000 nid=0x6107
>>>> waiting on condition [0x000000019b42d000]
>>>> java.lang.Thread.State: WAITING (parking)
>>>> at sun.misc.Unsafe.park(Native Method)
>>>> - parking to wait for <0x00000001683e9610> (a
>>>> java.util.concurrent.CountDownLatch$Sync)
>>>> at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
>>>> at
>>>> java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:836)
>>>> at
>>>> java.util.concurrent.locks.AbstractQueuedSynchronizer.doAcquireSharedInterruptibly(AbstractQueuedSynchronizer.java:997)
>>>> at
>>>> java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireSharedInterruptibly(AbstractQueuedSynchronizer.java:1304)
>>>> at java.util.concurrent.CountDownLatch.await(CountDownLatch.java:231)
>>>> at
>>>> ThrowingTasks$CheckingExecutor.beforeExecute(ThrowingTasks.java:168)
>>>> at
>>>> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1139)
>>>> at
>>>> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
>>>> at java.lang.Thread.run(Thread.java:744)
>>>>
>>>> "Thread-14" #23 prio=5 os_prio=31 tid=0x00007faf1d80c000 nid=0x500b
>>>> waiting on condition [0x000000019ad18000]
>>>> java.lang.Thread.State: WAITING (parking)
>>>> at sun.misc.Unsafe.park(Native Method)
>>>> - parking to wait for <0x00000001683e9610> (a
>>>> java.util.concurrent.CountDownLatch$Sync)
>>>> at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
>>>> at
>>>> java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:836)
>>>> at
>>>> java.util.concurrent.locks.AbstractQueuedSynchronizer.doAcquireSharedInterruptibly(AbstractQueuedSynchronizer.java:997)
>>>> at
>>>> java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireSharedInterruptibly(AbstractQueuedSynchronizer.java:1304)
>>>> at java.util.concurrent.CountDownLatch.await(CountDownLatch.java:231)
>>>> at
>>>> ThrowingTasks$CheckingExecutor.beforeExecute(ThrowingTasks.java:168)
>>>> at
>>>> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1139)
>>>> at
>>>> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
>>>> at java.lang.Thread.run(Thread.java:744)
>>>>
>>>> "Thread-13" #22 prio=5 os_prio=31 tid=0x00007faf1c108800 nid=0x5f03
>>>> waiting on condition [0x000000019b32a000]
>>>> java.lang.Thread.State: WAITING (parking)
>>>> at sun.misc.Unsafe.park(Native Method)
>>>> - parking to wait for <0x00000001683e9610> (a
>>>> java.util.concurrent.CountDownLatch$Sync)
>>>> at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
>>>> at
>>>> java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:836)
>>>> at
>>>> java.util.concurrent.locks.AbstractQueuedSynchronizer.doAcquireSharedInterruptibly(AbstractQueuedSynchronizer.java:997)
>>>> at
>>>> java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireSharedInterruptibly(AbstractQueuedSynchronizer.java:1304)
>>>> at java.util.concurrent.CountDownLatch.await(CountDownLatch.java:231)
>>>> at
>>>> ThrowingTasks$CheckingExecutor.beforeExecute(ThrowingTasks.java:168)
>>>> at
>>>> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1139)
>>>> at
>>>> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
>>>> at java.lang.Thread.run(Thread.java:744)
>>>>
>>>> "Thread-12" #21 prio=5 os_prio=31 tid=0x00007faf1d80b000 nid=0x540b
>>>> waiting on condition [0x000000019ab12000]
>>>> java.lang.Thread.State: WAITING (parking)
>>>> at sun.misc.Unsafe.park(Native Method)
>>>> - parking to wait for <0x00000001683e9610> (a
>>>> java.util.concurrent.CountDownLatch$Sync)
>>>> at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
>>>> at
>>>> java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:836)
>>>> at
>>>> java.util.concurrent.locks.AbstractQueuedSynchronizer.doAcquireSharedInterruptibly(AbstractQueuedSynchronizer.java:997)
>>>> at
>>>> java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireSharedInterruptibly(AbstractQueuedSynchronizer.java:1304)
>>>> at java.util.concurrent.CountDownLatch.await(CountDownLatch.java:231)
>>>> at
>>>> ThrowingTasks$CheckingExecutor.beforeExecute(ThrowingTasks.java:168)
>>>> at
>>>> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1139)
>>>> at
>>>> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
>>>> at java.lang.Thread.run(Thread.java:744)
>>>>
>>>> "Thread-10" #19 prio=5 os_prio=31 tid=0x00007faf1d80a800 nid=0x5107
>>>> waiting on condition [0x000000019af1e000]
>>>> java.lang.Thread.State: WAITING (parking)
>>>> at sun.misc.Unsafe.park(Native Method)
>>>> - parking to wait for <0x00000001683e9610> (a
>>>> java.util.concurrent.CountDownLatch$Sync)
>>>> at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
>>>> at
>>>> java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:836)
>>>> at
>>>> java.util.concurrent.locks.AbstractQueuedSynchronizer.doAcquireSharedInterruptibly(AbstractQueuedSynchronizer.java:997)
>>>> at
>>>> java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireSharedInterruptibly(AbstractQueuedSynchronizer.java:1304)
>>>> at java.util.concurrent.CountDownLatch.await(CountDownLatch.java:231)
>>>> at
>>>> ThrowingTasks$CheckingExecutor.beforeExecute(ThrowingTasks.java:168)
>>>> at
>>>> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1139)
>>>> at
>>>> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
>>>> at java.lang.Thread.run(Thread.java:744)
>>>>
>>>> "Thread-6" #14 prio=5 os_prio=31 tid=0x00007faf1d809800 nid=0x5807
>>>> waiting on condition [0x000000019ac15000]
>>>> java.lang.Thread.State: WAITING (parking)
>>>> at sun.misc.Unsafe.park(Native Method)
>>>> - parking to wait for <0x00000001683e9610> (a
>>>> java.util.concurrent.CountDownLatch$Sync)
>>>> at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
>>>> at
>>>> java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:836)
>>>> at
>>>> java.util.concurrent.locks.AbstractQueuedSynchronizer.doAcquireSharedInterruptibly(AbstractQueuedSynchronizer.java:997)
>>>> at
>>>> java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireSharedInterruptibly(AbstractQueuedSynchronizer.java:1304)
>>>> at java.util.concurrent.CountDownLatch.await(CountDownLatch.java:231)
>>>> at
>>>> ThrowingTasks$CheckingExecutor.beforeExecute(ThrowingTasks.java:168)
>>>> at
>>>> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1139)
>>>> at
>>>> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
>>>> at java.lang.Thread.run(Thread.java:744)
>>>>
>>>> "Thread-8" #16 prio=5 os_prio=31 tid=0x00007faf1d809000 nid=0x5b03
>>>> waiting on condition [0x000000019b124000]
>>>> java.lang.Thread.State: WAITING (parking)
>>>> at sun.misc.Unsafe.park(Native Method)
>>>> - parking to wait for <0x00000001683e9610> (a
>>>> java.util.concurrent.CountDownLatch$Sync)
>>>> at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
>>>> at
>>>> java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:836)
>>>> at
>>>> java.util.concurrent.locks.AbstractQueuedSynchronizer.doAcquireSharedInterruptibly(AbstractQueuedSynchronizer.java:997)
>>>> at
>>>> java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireSharedInterruptibly(AbstractQueuedSynchronizer.java:1304)
>>>> at java.util.concurrent.CountDownLatch.await(CountDownLatch.java:231)
>>>> at
>>>> ThrowingTasks$CheckingExecutor.beforeExecute(ThrowingTasks.java:168)
>>>> at
>>>> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1139)
>>>> at
>>>> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
>>>> at java.lang.Thread.run(Thread.java:744)
>>>>
>>>> "Service Thread" #8 daemon prio=9 os_prio=31 tid=0x00007faf1c837000
>>>> nid=0x4b03 runnable [0x0000000000000000]
>>>> java.lang.Thread.State: RUNNABLE
>>>>
>>>> "C1 CompilerThread2" #7 daemon prio=9 os_prio=31 tid=0x00007faf1c816000
>>>> nid=0x4903 waiting on condition [0x0000000000000000]
>>>> java.lang.Thread.State: RUNNABLE
>>>>
>>>> "C2 CompilerThread1" #6 daemon prio=9 os_prio=31 tid=0x00007faf1c809800
>>>> nid=0x4703 waiting on condition [0x0000000000000000]
>>>> java.lang.Thread.State: RUNNABLE
>>>>
>>>> "C2 CompilerThread0" #5 daemon prio=9 os_prio=31 tid=0x00007faf1c818000
>>>> nid=0x4503 waiting on condition [0x0000000000000000]
>>>> java.lang.Thread.State: RUNNABLE
>>>>
>>>> "Signal Dispatcher" #4 daemon prio=9 os_prio=31 tid=0x00007faf1c078800
>>>> nid=0x4303 runnable [0x0000000000000000]
>>>> java.lang.Thread.State: RUNNABLE
>>>>
>>>> "Finalizer" #3 daemon prio=8 os_prio=31 tid=0x00007faf1c811000
>>>> nid=0x2d03 in Object.wait() [0x00000001999be000]
>>>> java.lang.Thread.State: WAITING (on object monitor)
>>>> at java.lang.Object.wait(Native Method)
>>>> - waiting on <0x0000000168286218> (a
>>>> java.lang.ref.ReferenceQueue$Lock)
>>>> at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:142)
>>>> - locked <0x0000000168286218> (a java.lang.ref.ReferenceQueue$Lock)
>>>> at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:158)
>>>> at java.lang.ref.Finalizer$FinalizerThread.run(Finalizer.java:189)
>>>>
>>>> "Reference Handler" #2 daemon prio=10 os_prio=31 tid=0x00007faf1c810800
>>>> nid=0x2b03 in Object.wait() [0x00000001998bb000]
>>>> java.lang.Thread.State: WAITING (on object monitor)
>>>> at java.lang.Object.wait(Native Method)
>>>> - waiting on <0x0000000168285c88> (a java.lang.ref.Reference$Lock)
>>>> at java.lang.Object.wait(Object.java:502)
>>>> at java.lang.ref.Reference$ReferenceHandler.run(Reference.java:157)
>>>> - locked <0x0000000168285c88> (a java.lang.ref.Reference$Lock)
>>>>
>>>> "main" #1 prio=5 os_prio=31 tid=0x00007faf1c800000 nid=0x1b03 waiting on
>>>> condition [0x000000010386e000]
>>>> java.lang.Thread.State: WAITING (parking)
>>>> at sun.misc.Unsafe.park(Native Method)
>>>> - parking to wait for <0x00000001683e95e0> (a
>>>> java.util.concurrent.CountDownLatch$Sync)
>>>> at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
>>>> at
>>>> java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:836)
>>>> at
>>>> java.util.concurrent.locks.AbstractQueuedSynchronizer.doAcquireSharedInterruptibly(AbstractQueuedSynchronizer.java:997)
>>>> at
>>>> java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireSharedInterruptibly(AbstractQueuedSynchronizer.java:1304)
>>>> at java.util.concurrent.CountDownLatch.await(CountDownLatch.java:231)
>>>> at ThrowingTasks.realMain(ThrowingTasks.java:207)
>>>> at ThrowingTasks.main(ThrowingTasks.java:267)
>>>>
>>>> "VM Thread" os_prio=31 tid=0x00007faf1c066000 nid=0x2903 runnable
>>>>
>>>> "GC task thread#0 (ParallelGC)" os_prio=31 tid=0x00007faf1c80d000
>>>> nid=0x2103 runnable
>>>>
>>>> "GC task thread#1 (ParallelGC)" os_prio=31 tid=0x00007faf1c012000
>>>> nid=0x2303 runnable
>>>>
>>>> "GC task thread#2 (ParallelGC)" os_prio=31 tid=0x00007faf1c80e000
>>>> nid=0x2503 runnable
>>>>
>>>> "GC task thread#3 (ParallelGC)" os_prio=31 tid=0x00007faf1c013000
>>>> nid=0x2703 runnable
>>>>
>>>> "VM Periodic Task Thread" os_prio=31 tid=0x00007faf1c06c800 nid=0x4d03
>>>> waiting on condition
>>>>
>>>> JNI global references: 7
>>>>
>>>>
>>>> On 02/11/2013 04:01, Martin Buchholz wrote:
>>>>
>>>>
>>>>
>>>> Including a jstack output extract might be useful for diagnosis.
>>>>
>>>> I have never seen this test fail. Is there a hint that might allow me
>>>> to reproduce it?
>>>>
>>>>
>>>>
>>>
>>>
>>
>>
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