1// Copyright 2016 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 5package main 6 7// This program failed when run under the C/C++ ThreadSanitizer. The TSAN 8// sigaction function interceptor returned SIG_DFL instead of the Go runtime's 9// handler in registerSegvForwarder. 10 11/* 12#cgo CFLAGS: -fsanitize=thread 13#cgo LDFLAGS: -fsanitize=thread 14 15#include <signal.h> 16#include <stdio.h> 17#include <stdlib.h> 18#include <string.h> 19 20struct sigaction prev_sa; 21 22void forwardSignal(int signo, siginfo_t *info, void *context) { 23 // One of sa_sigaction and/or sa_handler 24 if ((prev_sa.sa_flags&SA_SIGINFO) != 0) { 25 prev_sa.sa_sigaction(signo, info, context); 26 return; 27 } 28 if (prev_sa.sa_handler != SIG_IGN && prev_sa.sa_handler != SIG_DFL) { 29 prev_sa.sa_handler(signo); 30 return; 31 } 32 33 fprintf(stderr, "No Go handler to forward to!\n"); 34 abort(); 35} 36 37void registerSegvFowarder() { 38 struct sigaction sa; 39 memset(&sa, 0, sizeof(sa)); 40 sigemptyset(&sa.sa_mask); 41 sa.sa_flags = SA_SIGINFO | SA_ONSTACK; 42 sa.sa_sigaction = forwardSignal; 43 44 if (sigaction(SIGSEGV, &sa, &prev_sa) != 0) { 45 perror("failed to register SEGV forwarder"); 46 exit(EXIT_FAILURE); 47 } 48} 49*/ 50import "C" 51 52func main() { 53 C.registerSegvFowarder() 54 55 defer func() { 56 recover() 57 }() 58 var nilp *int 59 *nilp = 42 60} 61