src/runtime/crash_cgo_test.go

// Copyright 2012 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.

// +build cgo

package runtime_test

import (
	"os/exec"
	"runtime"
	"strings"
	"testing"
)

func TestCgoCrashHandler(t *testing.T) {
	testCrashHandler(t, true)
}

func TestCgoSignalDeadlock(t *testing.T) {
	if testing.Short() && runtime.GOOS == "windows" {
		t.Skip("Skipping in short mode") // takes up to 64 seconds
	}
	got := executeTest(t, cgoSignalDeadlockSource, nil)
	want := "OK\n"
	if got != want {
		t.Fatalf("expected %q, but got %q", want, got)
	}
}

func TestCgoTraceback(t *testing.T) {
	got := executeTest(t, cgoTracebackSource, nil)
	want := "OK\n"
	if got != want {
		t.Fatalf("expected %q, but got %q", want, got)
	}
}

func TestCgoCallbackGC(t *testing.T) {
	if runtime.GOOS == "plan9" || runtime.GOOS == "windows" {
		t.Skipf("no pthreads on %s", runtime.GOOS)
	}
	if testing.Short() && runtime.GOOS == "dragonfly" {
		t.Skip("see golang.org/issue/11990")
	}
	got := executeTest(t, cgoCallbackGCSource, nil)
	want := "OK\n"
	if got != want {
		t.Fatalf("expected %q, but got %q", want, got)
	}
}

func TestCgoExternalThreadPanic(t *testing.T) {
	if runtime.GOOS == "plan9" {
		t.Skipf("no pthreads on %s", runtime.GOOS)
	}
	csrc := cgoExternalThreadPanicC
	if runtime.GOOS == "windows" {
		csrc = cgoExternalThreadPanicC_windows
	}
	got := executeTest(t, cgoExternalThreadPanicSource, nil, "main.c", csrc)
	want := "panic: BOOM"
	if !strings.Contains(got, want) {
		t.Fatalf("want failure containing %q. output:\n%s\n", want, got)
	}
}

func TestCgoExternalThreadSIGPROF(t *testing.T) {
	// issue 9456.
	switch runtime.GOOS {
	case "plan9", "windows":
		t.Skipf("no pthreads on %s", runtime.GOOS)
	case "darwin":
		if runtime.GOARCH != "arm" && runtime.GOARCH != "arm64" {
			// static constructor needs external linking, but we don't support
			// external linking on OS X 10.6.
			out, err := exec.Command("uname", "-r").Output()
			if err != nil {
				t.Fatalf("uname -r failed: %v", err)
			}
			// OS X 10.6 == Darwin 10.x
			if strings.HasPrefix(string(out), "10.") {
				t.Skipf("no external linking on OS X 10.6")
			}
		}
	}
	if runtime.GOARCH == "ppc64" {
		// TODO(austin) External linking not implemented on
		// ppc64 (issue #8912)
		t.Skipf("no external linking on ppc64")
	}
	got := executeTest(t, cgoExternalThreadSIGPROFSource, nil)
	want := "OK\n"
	if got != want {
		t.Fatalf("expected %q, but got %q", want, got)
	}
}

func TestCgoExternalThreadSignal(t *testing.T) {
	// issue 10139
	switch runtime.GOOS {
	case "plan9", "windows":
		t.Skipf("no pthreads on %s", runtime.GOOS)
	}
	got := executeTest(t, cgoExternalThreadSignalSource, nil)
	want := "OK\n"
	if got != want {
		t.Fatalf("expected %q, but got %q", want, got)
	}
}

func TestCgoDLLImports(t *testing.T) {
	// test issue 9356
	if runtime.GOOS != "windows" {
		t.Skip("skipping windows specific test")
	}
	got := executeTest(t, cgoDLLImportsMainSource, nil, "a/a.go", cgoDLLImportsPkgSource)
	want := "OK\n"
	if got != want {
		t.Fatalf("expected %q, but got %v", want, got)
	}
}

const cgoSignalDeadlockSource = `
package main

import "C"

import (
	"fmt"
	"runtime"
	"time"
)

func main() {
	runtime.GOMAXPROCS(100)
	ping := make(chan bool)
	go func() {
		for i := 0; ; i++ {
			runtime.Gosched()
			select {
			case done := <-ping:
				if done {
					ping <- true
					return
				}
				ping <- true
			default:
			}
			func() {
				defer func() {
					recover()
				}()
				var s *string
				*s = ""
			}()
		}
	}()
	time.Sleep(time.Millisecond)
	for i := 0; i < 64; i++ {
		go func() {
			runtime.LockOSThread()
			select {}
		}()
		go func() {
			runtime.LockOSThread()
			select {}
		}()
		time.Sleep(time.Millisecond)
		ping <- false
		select {
		case <-ping:
		case <-time.After(time.Second):
			fmt.Printf("HANG\n")
			return
		}
	}
	ping <- true
	select {
	case <-ping:
	case <-time.After(time.Second):
		fmt.Printf("HANG\n")
		return
	}
	fmt.Printf("OK\n")
}
`

const cgoTracebackSource = `
package main

/* void foo(void) {} */
import "C"

import (
	"fmt"
	"runtime"
)

func main() {
	C.foo()
	buf := make([]byte, 1)
	runtime.Stack(buf, true)
	fmt.Printf("OK\n")
}
`

const cgoCallbackGCSource = `
package main

import "runtime"

/*
#include <pthread.h>

void go_callback();

static void *thr(void *arg) {
    go_callback();
    return 0;
}

static void foo() {
    pthread_t th;
    pthread_attr_t attr;
    pthread_attr_init(&attr);
    pthread_attr_setstacksize(&attr, 256 << 10);
    pthread_create(&th, &attr, thr, 0);
    pthread_join(th, 0);
}
*/
import "C"
import "fmt"

//export go_callback
func go_callback() {
	runtime.GC()
	grow()
	runtime.GC()
}

var cnt int

func grow() {
	x := 10000
	sum := 0
	if grow1(&x, &sum) == 0 {
		panic("bad")
	}
}

func grow1(x, sum *int) int {
	if *x == 0 {
		return *sum + 1
	}
	*x--
	sum1 := *sum + *x
	return grow1(x, &sum1)
}

func main() {
	const P = 100
	done := make(chan bool)
	// allocate a bunch of stack frames and spray them with pointers
	for i := 0; i < P; i++ {
		go func() {
			grow()
			done <- true
		}()
	}
	for i := 0; i < P; i++ {
		<-done
	}
	// now give these stack frames to cgo callbacks
	for i := 0; i < P; i++ {
		go func() {
			C.foo()
			done <- true
		}()
	}
	for i := 0; i < P; i++ {
		<-done
	}
	fmt.Printf("OK\n")
}
`

const cgoExternalThreadPanicSource = `
package main

// void start(void);
import "C"

func main() {
	C.start()
	select {}
}

//export gopanic
func gopanic() {
	panic("BOOM")
}
`

const cgoExternalThreadPanicC = `
#include <stdlib.h>
#include <stdio.h>
#include <pthread.h>

void gopanic(void);

static void*
die(void* x)
{
	gopanic();
	return 0;
}

void
start(void)
{
	pthread_t t;
	if(pthread_create(&t, 0, die, 0) != 0)
		printf("pthread_create failed\n");
}
`

const cgoExternalThreadPanicC_windows = `
#include <stdlib.h>
#include <stdio.h>

void gopanic(void);

static void*
die(void* x)
{
	gopanic();
	return 0;
}

void
start(void)
{
	if(_beginthreadex(0, 0, die, 0, 0, 0) != 0)
		printf("_beginthreadex failed\n");
}
`

const cgoExternalThreadSIGPROFSource = `
package main

/*
#include <stdint.h>
#include <signal.h>
#include <pthread.h>

volatile int32_t spinlock;

static void *thread1(void *p) {
	(void)p;
	while (spinlock == 0)
		;
	pthread_kill(pthread_self(), SIGPROF);
	spinlock = 0;
	return NULL;
}
__attribute__((constructor)) void issue9456() {
	pthread_t tid;
	pthread_create(&tid, 0, thread1, NULL);
}
*/
import "C"

import (
	"runtime"
	"sync/atomic"
	"unsafe"
)

func main() {
	// This test intends to test that sending SIGPROF to foreign threads
	// before we make any cgo call will not abort the whole process, so
	// we cannot make any cgo call here. See https://golang.org/issue/9456.
	atomic.StoreInt32((*int32)(unsafe.Pointer(&C.spinlock)), 1)
	for atomic.LoadInt32((*int32)(unsafe.Pointer(&C.spinlock))) == 1 {
		runtime.Gosched()
	}
	println("OK")
}
`

const cgoExternalThreadSignalSource = `
package main

/*
#include <pthread.h>

void **nullptr;

void *crash(void *p) {
	*nullptr = p;
	return 0;
}

int start_crashing_thread(void) {
	pthread_t tid;
	return pthread_create(&tid, 0, crash, 0);
}
*/
import "C"

import (
	"fmt"
	"os"
	"os/exec"
	"time"
)

func main() {
	if len(os.Args) > 1 && os.Args[1] == "crash" {
		i := C.start_crashing_thread()
		if i != 0 {
			fmt.Println("pthread_create failed:", i)
			// Exit with 0 because parent expects us to crash.
			return
		}

		// We should crash immediately, but give it plenty of
		// time before failing (by exiting 0) in case we are
		// running on a slow system.
		time.Sleep(5 * time.Second)
		return
	}

	out, err := exec.Command(os.Args[0], "crash").CombinedOutput()
	if err == nil {
		fmt.Println("C signal did not crash as expected\n")
		fmt.Printf("%s\n", out)
		os.Exit(1)
	}

	fmt.Println("OK")
}
`

const cgoDLLImportsMainSource = `
package main

/*
#include <windows.h>

DWORD getthread() {
	return GetCurrentThreadId();
}
*/
import "C"

import "./a"

func main() {
	C.getthread()
	a.GetThread()
	println("OK")
}
`

const cgoDLLImportsPkgSource = `
package a

/*
#cgo CFLAGS: -mnop-fun-dllimport

#include <windows.h>

DWORD agetthread() {
	return GetCurrentThreadId();
}
*/
import "C"

func GetThread() uint32 {
	return uint32(C.agetthread())
}
`