diff -r 1653229eceb3 -r d935ba54284e src/mem/ruby/common/NetDest.cc
--- a/src/mem/ruby/common/NetDest.cc	Sat Jul 14 10:43:47 2012 -0500
+++ b/src/mem/ruby/common/NetDest.cc	Sat Jul 14 10:45:54 2012 -0500
@@ -38,6 +38,7 @@
 void
 NetDest::add(MachineID newElement)
 {
+    assert(bitIndex(newElement.num) < m_bits[vecIndex(newElement)].getSize());
     m_bits[vecIndex(newElement)].add(bitIndex(newElement.num));
 }