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arena_fail.go
// Copyright 2022 The Go Authors. All rights reserved. // Use of this source code is governed by a BSD-style // license that can be found in the LICENSE file. //go:build goexperiment.arenas package main import "arena" func main() { a := arena.NewArena() x := arena.New[[200]byte](a) x[0] = 9 a.Free() // Use after free. // // ASAN should detect this deterministically as Free // should poison the arena memory. // // MSAN should detect that this access is to freed // memory. This may crash with an "accessed freed arena // memory" error before MSAN gets a chance, but if MSAN // was not enabled there would be a chance that this // could fail to crash on its own. println(x[0]) }
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