Hi, The test failed due to degenerated cycle, which takes over task queue from earlier cycle. Resetting task queue statistics under these circumstances, results assertion failures during print_statistics(). Webrev: http://cr.openjdk.java.net/~zgu/shenandoah/degen_tq_stats/webrev.00/ Test: hotspot_gc_shenandoah. Thanks, -Zhengyu