currentTimeMillis() is not monotonically increasing. To me it seems sleep(timeout) would be much better (and easier to read).

This is most probably not related to JDK-8293289, a huge offset in time would be needed like daytime saving.

Although it is not causing JDK-8293289, it is still wrong.

change
```
        // check timeout to success deadlocking
        while(System.currentTimeMillis() < startTime + timeout) {
            System.out.println("sleeping...");
            sleep(1000);
        }
```
to something like: `sleep(timeout)`