javax/swing/JList/6462008/bug6462008.java fails

Mac OS X 10.7.3, iMac

With b16, this test fails not too often with such an exception:

java.lang.RuntimeException: anchor is -1, should be 0
   at bug6462008.checkSelectionNonThreadSafe(bug6462008.java:389)

Note that I cannot reproduce this on my macmini4,1 running just this test alone. Perhaps there's some sort of a race (as NonThreadSafe name of the method suggests).