| // Copyright 2017 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. | |
| package main | |
| // This program hung when run under the C/C++ ThreadSanitizer. TSAN installs a | |
| // libc interceptor that writes signal handlers to a global variable within the | |
| // TSAN runtime instead of making a sigaction system call. A bug in | |
| // syscall.runtime_AfterForkInChild corrupted TSAN's signal forwarding table | |
| // during calls to (*os/exec.Cmd).Run, causing the parent process to fail to | |
| // invoke signal handlers. | |
| import ( | |
| "fmt" | |
| "os" | |
| "os/exec" | |
| "os/signal" | |
| "syscall" | |
| ) | |
| import "C" | |
| func main() { | |
| ch := make(chan os.Signal, 1) | |
| signal.Notify(ch, syscall.SIGUSR1) | |
| if err := exec.Command("true").Run(); err != nil { | |
| fmt.Fprintf(os.Stderr, "Unexpected error from `true`: %v", err) | |
| os.Exit(1) | |
| } | |
| syscall.Kill(syscall.Getpid(), syscall.SIGUSR1) | |
| <-ch | |
| } | |