Program: 43987
Project: 43987
Buggy source:
public boolean luaStackCall(LuaState vm){
switch (id) {
case INSTALL:
    install(vm._G);
  break;
case CONCAT:
{
  int n=vm.gettop();
  LTable table=vm.totable(2);
  LString sep=(n >= 3 ? vm.tolstring(3) : null);
  int i=vm.tointeger(4);
  int j=vm.tointeger(5);
  int len=table.luaLength();
  if (i == 0)   i=1;
  if (j == 0)   j=len;
  ByteArrayOutputStream baos=new ByteArrayOutputStream();
  try {
    for (int k=i; k <= j; k++) {
      LValue v=table.get(k);
      v.luaAsString().write(baos);
      if (k < j && sep != null)       sep.write(baos);
    }
    vm.resettop();
    vm.pushlstring(baos.toByteArray());
  }
 catch (  IOException e) {
    vm.error(e.getMessage());
  }
  break;
}
case FOREACH:
case FOREACHI:
{
LTable table=vm.totable(2);
LFunction function=vm.tojavafunction(3);
LValue result=table.foreach(vm,function,id == FOREACHI);
vm.resettop();
vm.pushlvalue(result);
break;
}
case GETN:
{
LTable table=vm.totable(2);
vm.resettop();
vm.pushinteger(table.luaLength());
break;
}
case INSERT:
{
int n=vm.gettop();
LTable table=vm.totable(2);
int pos=(n >= 4 ? vm.tointeger(3) : 0);
LValue value=vm.topointer(-1);
table.luaInsertPos(pos,value);
break;
}
case MAXN:
{
LTable table=vm.totable(2);
vm.resettop();
vm.pushinteger(table.luaMaxN());
break;
}
case REMOVE:
{
int n=vm.gettop();
LTable table=vm.totable(2);
int pos=(n >= 3 ? vm.tointeger(3) : 0);
vm.resettop();
vm.pushlvalue(table.luaRemovePos(pos));
break;
}
case SORT:
{
LTable table=vm.totable(2);
LValue compare=vm.topointer(3);
table.luaSort(vm,compare);
vm.resettop();
break;
}
default :
LuaState.vmerror("String_Node_Str");
}
return false;
}

Fixed version (ground truth):
public boolean luaStackCall(LuaState vm){
switch (id) {
case INSTALL:
    install(vm._G);
  break;
case CONCAT:
{
  int n=vm.gettop();
  LTable table=vm.totable(2);
  LString sep=(n >= 3 ? vm.tolstring(3) : null);
  int i=vm.tointeger(4);
  int j=vm.tointeger(5);
  int len=table.luaLength();
  if (i == 0)   i=1;
  if (j == 0)   j=len;
  ByteArrayOutputStream baos=new ByteArrayOutputStream();
  try {
    for (int k=i; k <= j; k++) {
      LValue v=table.get(k);
      v.luaAsString().write(baos);
      if (k < j && sep != null)       sep.write(baos);
    }
    vm.resettop();
    vm.pushlstring(baos.toByteArray());
  }
 catch (  IOException e) {
    vm.error(e.getMessage());
  }
  break;
}
case FOREACH:
case FOREACHI:
{
LTable table=vm.totable(2);
LFunction function=vm.tojavafunction(3);
LValue result=table.foreach(vm,function,id == FOREACHI);
vm.resettop();
vm.pushlvalue(result);
break;
}
case GETN:
{
LTable table=vm.totable(2);
vm.resettop();
vm.pushinteger(table.luaLength());
break;
}
case INSERT:
{
int n=vm.gettop();
LTable table=vm.totable(2);
int pos=(n >= 4 ? vm.tointeger(3) : 0);
LValue value=vm.topointer(-1);
table.luaInsertPos(pos,value);
break;
}
case MAXN:
{
LTable table=vm.totable(2);
vm.resettop();
vm.pushlvalue(table.luaMaxN());
break;
}
case REMOVE:
{
int n=vm.gettop();
LTable table=vm.totable(2);
int pos=(n >= 3 ? vm.tointeger(3) : 0);
vm.resettop();
vm.pushlvalue(table.luaRemovePos(pos));
break;
}
case SORT:
{
LTable table=vm.totable(2);
LValue compare=vm.topointer(3);
table.luaSort(vm,compare);
vm.resettop();
break;
}
default :
LuaState.vmerror("String_Node_Str");
}
return false;
}