1// Copyright 2022 The Go Authors. All rights reserved. 2// Use of this source code is governed by a BSD-style 3// license that can be found in the LICENSE file. 4 5//go:build goexperiment.arenas 6 7package main 8 9import "arena" 10 11func main() { 12 a := arena.NewArena() 13 x := arena.New[[200]byte](a) 14 x[0] = 9 15 a.Free() 16 // Use after free. 17 // 18 // ASAN should detect this deterministically as Free 19 // should poison the arena memory. 20 // 21 // MSAN should detect that this access is to freed 22 // memory. This may crash with an "accessed freed arena 23 // memory" error before MSAN gets a chance, but if MSAN 24 // was not enabled there would be a chance that this 25 // could fail to crash on its own. 26 println(x[0]) 27} 28