ShenandoahWeakRoot::oop_do() uses wrong timing phase. Bug: https://bugs.openjdk.java.net/browse/JDK-8229206 Webrev: http://cr.openjdk.java.net/~zgu/JDK-8229206/webrev.00/ Test: hotspot_gc_shenandoah (fastdebug and release) Thanks, -Zhengyu