| // 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) |
| 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 |
| } |
