Hello! This is an 8u-dev only fix. (In 9 the bug was fixed with a massive update [1]).
The fix is essentially one-liner: just check that the index remains within the bounds after update.
Regression test was updated to cover the case. Would you please help review at your convenience? BUGURL: https://bugs.openjdk.java.net/browse/JDK-8169056 WEBREV: http://cr.openjdk.java.net/~igerasim/8169056/00/webrev/ [1] http://hg.openjdk.java.net/jdk9/dev/jdk/rev/d0c319c32334 -- With kind regards, Ivan Gerasimov