Merge pull request ethereum#1896 from karalabe/fix-vm-stack-logs

core/vm: copy stack element to prevent overwrites

core/vm/vm.go

@@ -370,17 +370,18 @@ func (self *Vm) log(pc uint64, op OpCode, gas, cost *big.Int, memory *Memory, st
 	if Debug {
 		mem := make([]byte, len(memory.Data()))
 		copy(mem, memory.Data())
-		stck := make([]*big.Int, len(stack.Data()))
-		copy(stck, stack.Data())
 
+		stck := make([]*big.Int, len(stack.Data()))
+		for i, item := range stack.Data() {
+			stck[i] = new(big.Int).Set(item)
+		}
 		storage := make(map[common.Hash][]byte)
 		/*
 			object := contract.self.(*state.StateObject)
 			object.EachStorage(func(k, v []byte) {
 				storage[common.BytesToHash(k)] = v
 			})
 		*/
-
 		self.env.AddStructLog(StructLog{pc, op, new(big.Int).Set(gas), cost, mem, stck, storage, err})
 	}
 }