closed/sun/java2d/SunGraphics2D/CoordinateTruncationBug.java failed on linux

test closed/sun/java2d/SunGraphics2D/CoordinateTruncationBug.java almost always fails on linux; sometimes it passes

reproduced with jdk's: 7u25b15, 8b103, 8b57
can't reproduce the issue on windows 7 with jdk8b103

see also JDK-7040022 and JDK-7043455

failure log:
----------System.out:(0/0)----------
----------System.err:(15/829)----------
Screen(0, 0) == fff2f1f0
Screen failed!
java.lang.RuntimeException: Test failed due to 1 or more failures
at CoordinateTruncationBug.main(CoordinateTruncationBug.java:39)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:491)
at com.sun.javatest.regtest.MainWrapper$MainThread.run(MainWrapper.java:94)
at java.lang.Thread.run(Thread.java:724)