--- old/src/share/vm/gc_implementation/parallelScavenge/psYoungGen.cpp	2013-09-19 22:40:49.000000000 +0200
+++ new/src/share/vm/gc_implementation/parallelScavenge/psYoungGen.cpp	2013-09-19 22:40:49.000000000 +0200
@@ -158,6 +158,7 @@
   // Compute sizes
   size_t alignment = heap->intra_heap_alignment();
   size_t size = virtual_space()->committed_size();
+  assert(size >= 3 * alignment, "Young space is not large enough for eden + 2 survivors");
 
   size_t survivor_size = size / InitialSurvivorRatio;
   survivor_size = align_size_down(survivor_size, alignment);