blob: 55ff67ecbafc473795ad158b794a2f15675c59f5 [file] [log] [blame]
// 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 failed with SIGSEGV when run under the C/C++ ThreadSanitizer.
// The Go runtime had re-registered the C handler with the wrong flags due to a
// typo, resulting in null pointers being passed for the info and context
// parameters to the handler.
#cgo CFLAGS: -fsanitize=thread
#cgo LDFLAGS: -fsanitize=thread
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ucontext.h>
void check_params(int signo, siginfo_t *info, void *context) {
ucontext_t* uc = (ucontext_t*)(context);
if (info->si_signo != signo) {
fprintf(stderr, "info->si_signo does not match signo.\n");
if (uc->uc_stack.ss_size == 0) {
fprintf(stderr, "uc_stack has size 0.\n");
// Set up the signal handler in a high priority constructor, so
// that it is installed before the Go code starts.
static void register_handler(void) __attribute__ ((constructor (200)));
static void register_handler() {
struct sigaction sa;
memset(&sa, 0, sizeof(sa));
sa.sa_flags = SA_SIGINFO;
sa.sa_sigaction = check_params;
if (sigaction(SIGUSR1, &sa, NULL) != 0) {
perror("failed to register SIGUSR1 handler");
import "C"
import "syscall"
func init() {
func main() {}