*** old/src/share/vm/gc_implementation/parallelScavenge/psYoungGen.cpp	Mon Sep 30 21:53:57 2013
--- new/src/share/vm/gc_implementation/parallelScavenge/psYoungGen.cpp	Mon Sep 30 21:53:57 2013

*** 156,165 ****
--- 156,166 ----
    assert(heap->kind() == CollectedHeap::ParallelScavengeHeap, "Sanity");
  
    // 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);
    // ... but never less than an alignment
    survivor_size = MAX2(survivor_size, alignment);