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 } 36
