// The msan tests require support for the -msan option.
	if !compilerRequiredTsanVersion(goos, goarch) {
		t.Skipf("skipping on %s/%s; compiler version for -tsan option is too old.", goos, goarch)
	}

	t.Parallel()
	requireOvercommit(t)
	config := configure("thread")
	config.skipIfCSanitizerBroken(t)

	mustRun(t, config.goCmd("build", "std"))

	cases := []struct {
		src          string
		needsRuntime bool
	}{
		{src: "tsan.go"},

	// Overcommit is enabled by default on FreeBSD (vm.overcommit=0, see tuning(7)).
	// Do not skip tests with stricter overcommit settings unless testing shows that FreeBSD has similar issues.
	if goos == "linux" {
		requireOvercommit(t)
	}
	config := configure("memory")
	config.skipIfCSanitizerBroken(t)

	mustRun(t, config.goCmd("build", "std"))

	cases := []struct {
		src         string
		wantErr     bool
		experiments []string

	// otherwise a segmentation fault will occur.
	if !compilerRequiredAsanVersion(goos, goarch) {
		t.Skipf("skipping on %s/%s: too old version of compiler", goos, goarch)
	}

	t.Parallel()
	requireOvercommit(t)
	config := configure("address")
	config.skipIfCSanitizerBroken(t)

	mustRun(t, config.goCmd("build", "std"))

	cases := []struct {
		src               string
		memoryAccessError string

	"internal/testenv"
	"os"
	"strings"
	"testing"
)

func TestShared(t *testing.T) {
	testenv.MustHaveGoBuild(t)
	testenv.MustHaveCGO(t)
	testenv.MustHaveBuildMode(t, "c-shared")

	t.Parallel()
	requireOvercommit(t)

	GOOS, err := goEnv("GOOS")
	if err != nil {
		t.Fatal(err)
	}

	GOARCH, err := goEnv("GOARCH")
	if err != nil {
		t.Fatal(err)
	}

	libExt := "so"
	if GOOS == "darwin" {

	"strconv"
	"strings"
	"sync"
	"syscall"
	"testing"
	"time"
	"unicode"
)

var overcommit struct {
	sync.Once
	value int
	err   error
}

// requireOvercommit skips t if the kernel does not allow overcommit.
func requireOvercommit(t *testing.T) {
	t.Helper()

	overcommit.Once.Do(func() {
		var out []byte
		out, overcommit.err = os.ReadFile("/proc/sys/vm/overcommit_memory")
		if overcommit.err != nil {