Thank you！
I'm version is 7u55. and upgrade 7u60 test is ok.
jdk 1.7.0_55 test result
time:Tue Nov 11 13:24:01 CST 2014
nanoTime:18093680000
currentTime:18093
-------------------------
time:Tue Nov 11 13:24:02 CST 2014
nanoTime:19097878000
currentTime:19098
-------------------------
time:Tue Nov 11 12:24:03 CST 2014
nanoTime:-3580426662000 (negative difference)
currentTime:-3580427
-------------------------
time:Tue Nov 11 12:24:04 CST 2014
nanoTime:-3579424553000
currentTime:-3579425
jdk 1.7.0_60 test result
time:Tue Nov 11 12:28:51 CST 2014
nanoTime:8034263027
currentTime:8034
-------------------------
time:Tue Nov 11 12:28:52 CST 2014
nanoTime:9034780087
currentTime:9035
-------------------------
time:Tue Nov 11 11:28:50 CST 2014
nanoTime:10035322113 (is ok)
currentTime:-3593155
-------------------------
time:Tue Nov 11 11:28:51 CST 2014
nanoTime:11035884267
currentTime:-3592154
> 在 2014年11月11日，上午10:25，David Holmes <david.hol...@oracle.com> 写道：
>
> Repeating my response due to the subject mangling in the other "thread":
>
> This is a known issue:
>
> https://bugs.openjdk.java.net/browse/JDK-6900441
>
> fixed in 7u60, 8 and 9.
>
> What version were you running?
>
> David
>
> On 7/11/2014 6:22 PM, wuwen.55 wrote:
>> call .await(10, TimeUnit.SECONDS) and change the time one hours back.
>>
>> i.e. start at 13:00 call .await and at 13:05 change the time to 12:05
>>
>> you will notice that the wait does not return.
>>
>> when change the time to the current time . change the time to 13:05.
>>
>> the wait still does not return.
>>
>> test code:
>> CountDownLatch c = new CountDownLatch(1);
>> ...
>> c.await(10, TimeUnit.SECONDS);
>> ...
>> ----------------------------------
>>
>> AbstractQueuedSynchronizer.doAcquireNanos
>>
>>
>> long lastTime = System.nanoTime();
>> final Node node = addWaiter(Node.EXCLUSIVE);
>> boolean failed = true;
>> try {
>> for (;;) {
>> final Node p = node.predecessor();
>> if (p == head && tryAcquire(arg)) {
>> setHead(node);
>> p.next = null; // help GC
>> failed = false;
>> return true;
>> }
>> if (nanosTimeout <= 0)
>> return false;
>> if (shouldParkAfterFailedAcquire(p, node) &&
>> nanosTimeout > spinForTimeoutThreshold)
>> LockSupport.parkNanos(this, nanosTimeout);
>> long now = System.nanoTime();
>> nanosTimeout -= now - lastTime;
>> lastTime = now;
>> if (Thread.interrupted())
>> throw new InterruptedException();
>> }
>> } finally {
>> if (failed)
>> cancelAcquire(node);
>> }
>>
>> when change the time one hours back
>>
>> now - lastTime is negative number.
>>
>> —————————
>>
>>
