libgo/misc/cgo/testsanitizers/src/tsan12.go

   1 // Copyright 2017 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 package main
   6
   7 // This program hung when run under the C/C++ ThreadSanitizer. TSAN installs a
   8 // libc interceptor that writes signal handlers to a global variable within the
   9 // TSAN runtime instead of making a sigaction system call. A bug in
  10 // syscall.runtime_AfterForkInChild corrupted TSAN's signal forwarding table
  11 // during calls to (*os/exec.Cmd).Run, causing the parent process to fail to
  12 // invoke signal handlers.
  13
  14 import (
  15         "fmt"
  16         "os"
  17         "os/exec"
  18         "os/signal"
  19         "syscall"
  20 )
  21
  22 import "C"
  23
  24 func main() {
  25         ch := make(chan os.Signal)
  26         signal.Notify(ch, syscall.SIGUSR1)
  27
  28         if err := exec.Command("true").Run(); err != nil {
  29                 fmt.Fprintf(os.Stderr, "Unexpected error from `true`: %v", err)
  30                 os.Exit(1)
  31         }
  32
  33         syscall.Kill(syscall.Getpid(), syscall.SIGUSR1)
  34         <-ch
  35 }