Hi, I have been trying to analyze the cause for OOME with Shenandoah, only to figure that Shenandoah does not support heap dumping (d'oh). Solved this by implementing ShenandoahHeap::safe_object_iterate: http://cr.openjdk.java.net/~shade/shenandoah/heapdump-support/webrev.01/ Testing: manual heap dumps with fastdebug/release. Thanks, -Aleksey