--- a/src/hotspot/share/gc/shenandoah/shenandoahHeap.cpp	Thu Oct 10 21:54:53 2019 +0200
+++ b/src/hotspot/share/gc/shenandoah/shenandoahHeap.cpp	Thu Oct 10 21:54:54 2019 +0200
@@ -963,7 +963,8 @@
     ShenandoahConcurrentEvacuateRegionObjectClosure cl(_sh);
     ShenandoahHeapRegion* r;
     while ((r =_cs->claim_next()) != NULL) {
-      assert(r->has_live(), "all-garbage regions are reclaimed early");
+      assert(r->has_live(), "Region " SIZE_FORMAT " should have been reclaimed early", r->region_number());
+      assert(r->is_conc_move_allowed(), "Region " SIZE_FORMAT " should be movable", r->region_number());
       _sh->marked_object_iterate(r, &cl);
 
       if (ShenandoahPacing) {