misc/cgo/testsanitizers: convert test.bash to Go

This makes it much easier to run individual failing subtests.

Use $(go env CC) instead of always defaulting to clang; this makes it
easier to test with other compilers.

Run C binaries to detect incompatible compiler/kernel pairings instead
of sniffing versions.

updates #21196

Change-Id: I0debb3cc4a4244df44b825157ffdc97b5c09338d
Reviewed-on: https://go-review.googlesource.com/52910
Run-TryBot: Bryan Mills <bcmills@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

27 files changed, 665 insertions, 234 deletions

diff --git a/misc/cgo/testsanitizers/cc_test.go b/misc/cgo/testsanitizers/cc_test.go
new file mode 100644
index 0000000000..cacb0d93df
--- /dev/null
+++ b/misc/cgo/testsanitizers/cc_test.go
@@ -0,0 +1,441 @@
+// 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.
+
+// sanitizers_test checks the use of Go with sanitizers like msan, asan, etc.
+// See https://github.com/google/sanitizers.
+package sanitizers_test
+
+import (
+	"bytes"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"io/ioutil"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"regexp"
+	"strconv"
+	"strings"
+	"sync"
+	"syscall"
+	"testing"
+	"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 = ioutil.ReadFile("/proc/sys/vm/overcommit_memory")
+		if overcommit.err != nil {
+			return
+		}
+		overcommit.value, overcommit.err = strconv.Atoi(string(bytes.TrimSpace(out)))
+	})
+
+	if overcommit.err != nil {
+		t.Skipf("couldn't determine vm.overcommit_memory (%v); assuming no overcommit", overcommit.err)
+	}
+	if overcommit.value == 2 {
+		t.Skip("vm.overcommit_memory=2")
+	}
+}
+
+var env struct {
+	sync.Once
+	m   map[string]string
+	err error
+}
+
+// goEnv returns the output of $(go env) as a map.
+func goEnv(key string) (string, error) {
+	env.Once.Do(func() {
+		var out []byte
+		out, env.err = exec.Command("go", "env", "-json").Output()
+		if env.err != nil {
+			return
+		}
+
+		env.m = make(map[string]string)
+		env.err = json.Unmarshal(out, &env.m)
+	})
+	if env.err != nil {
+		return "", env.err
+	}
+
+	v, ok := env.m[key]
+	if !ok {
+		return "", fmt.Errorf("`go env`: no entry for %v", key)
+	}
+	return v, nil
+}
+
+// replaceEnv sets the key environment variable to value in cmd.
+func replaceEnv(cmd *exec.Cmd, key, value string) {
+	if cmd.Env == nil {
+		cmd.Env = os.Environ()
+	}
+	cmd.Env = append(cmd.Env, key+"="+value)
+}
+
+// mustRun executes t and fails cmd with a well-formatted message if it fails.
+func mustRun(t *testing.T, cmd *exec.Cmd) {
+	t.Helper()
+	out, err := cmd.CombinedOutput()
+	if err != nil {
+		t.Fatalf("%#q exited with %v\n%s", strings.Join(cmd.Args, " "), err, out)
+	}
+}
+
+// cc returns a cmd that executes `$(go env CC) $(go env GOGCCFLAGS) $args`.
+func cc(args ...string) (*exec.Cmd, error) {
+	CC, err := goEnv("CC")
+	if err != nil {
+		return nil, err
+	}
+
+	GOGCCFLAGS, err := goEnv("GOGCCFLAGS")
+	if err != nil {
+		return nil, err
+	}
+
+	// Split GOGCCFLAGS, respecting quoting.
+	//
+	// TODO(bcmills): This code also appears in
+	// misc/cgo/testcarchive/carchive_test.go, and perhaps ought to go in
+	// src/cmd/dist/test.go as well. Figure out where to put it so that it can be
+	// shared.
+	var flags []string
+	quote := '\000'
+	start := 0
+	lastSpace := true
+	backslash := false
+	for i, c := range GOGCCFLAGS {
+		if quote == '\000' && unicode.IsSpace(c) {
+			if !lastSpace {
+				flags = append(flags, GOGCCFLAGS[start:i])
+				lastSpace = true
+			}
+		} else {
+			if lastSpace {
+				start = i
+				lastSpace = false
+			}
+			if quote == '\000' && !backslash && (c == '"' || c == '\'') {
+				quote = c
+				backslash = false
+			} else if !backslash && quote == c {
+				quote = '\000'
+			} else if (quote == '\000' || quote == '"') && !backslash && c == '\\' {
+				backslash = true
+			} else {
+				backslash = false
+			}
+		}
+	}
+	if !lastSpace {
+		flags = append(flags, GOGCCFLAGS[start:])
+	}
+
+	cmd := exec.Command(CC, flags...)
+	cmd.Args = append(cmd.Args, args...)
+	return cmd, nil
+}
+
+type version struct {
+	name         string
+	major, minor int
+}
+
+var compiler struct {
+	sync.Once
+	version
+	err error
+}
+
+// compilerVersion detects the version of $(go env CC).
+//
+// It returns a non-nil error if the compiler matches a known version schema but
+// the version could not be parsed, or if $(go env CC) could not be determined.
+func compilerVersion() (version, error) {
+	compiler.Once.Do(func() {
+		compiler.err = func() error {
+			compiler.name = "unknown"
+
+			cmd, err := cc("--version")
+			if err != nil {
+				return err
+			}
+			out, err := cmd.Output()
+			if err != nil {
+				// Compiler does not support "--version" flag: not Clang or GCC.
+				return nil
+			}
+
+			var match [][]byte
+			if bytes.HasPrefix(out, []byte("gcc")) {
+				compiler.name = "gcc"
+
+				cmd, err := cc("-dumpversion")
+				if err != nil {
+					return err
+				}
+				out, err := cmd.Output()
+				if err != nil {
+					// gcc, but does not support gcc's "-dumpversion" flag?!
+					return err
+				}
+				gccRE := regexp.MustCompile(`(\d+)\.(\d+)`)
+				match = gccRE.FindSubmatch(out)
+			} else {
+				clangRE := regexp.MustCompile(`clang version (\d+)\.(\d+)`)
+				if match = clangRE.FindSubmatch(out); len(match) > 0 {
+					compiler.name = "clang"
+				}
+			}
+
+			if len(match) < 3 {
+				return nil // "unknown"
+			}
+			if compiler.major, err = strconv.Atoi(string(match[1])); err != nil {
+				return err
+			}
+			if compiler.minor, err = strconv.Atoi(string(match[2])); err != nil {
+				return err
+			}
+			return nil
+		}()
+	})
+	return compiler.version, compiler.err
+}
+
+type compilerCheck struct {
+	once sync.Once
+	err  error
+	skip bool // If true, skip with err instead of failing with it.
+}
+
+type config struct {
+	sanitizer string
+
+	cFlags, ldFlags, goFlags []string
+
+	sanitizerCheck, runtimeCheck compilerCheck
+}
+
+var configs struct {
+	sync.Mutex
+	m map[string]*config
+}
+
+// configure returns the configuration for the given sanitizer.
+func configure(sanitizer string) *config {
+	configs.Lock()
+	defer configs.Unlock()
+	if c, ok := configs.m[sanitizer]; ok {
+		return c
+	}
+
+	c := &config{
+		sanitizer: sanitizer,
+		cFlags:    []string{"-fsanitize=" + sanitizer},
+		ldFlags:   []string{"-fsanitize=" + sanitizer},
+	}
+
+	if testing.Verbose() {
+		c.goFlags = append(c.goFlags, "-x")
+	}
+
+	switch sanitizer {
+	case "memory":
+		c.goFlags = append(c.goFlags, "-msan")
+
+	case "thread":
+		c.goFlags = append(c.goFlags, "--installsuffix=tsan")
+		compiler, _ := compilerVersion()
+		if compiler.name == "gcc" {
+			c.cFlags = append(c.cFlags, "-fPIC")
+			c.ldFlags = append(c.ldFlags, "-fPIC", "-static-libtsan")
+		}
+
+	default:
+		panic(fmt.Sprintf("unrecognized sanitizer: %q", sanitizer))
+	}
+
+	if configs.m == nil {
+		configs.m = make(map[string]*config)
+	}
+	configs.m[sanitizer] = c
+	return c
+}
+
+// goCmd returns a Cmd that executes "go $subcommand $args" with appropriate
+// additional flags and environment.
+func (c *config) goCmd(subcommand string, args ...string) *exec.Cmd {
+	cmd := exec.Command("go", subcommand)
+	cmd.Args = append(cmd.Args, c.goFlags...)
+	cmd.Args = append(cmd.Args, args...)
+	replaceEnv(cmd, "CGO_CFLAGS", strings.Join(c.cFlags, " "))
+	replaceEnv(cmd, "CGO_LDFLAGS", strings.Join(c.ldFlags, " "))
+	return cmd
+}
+
+// skipIfCSanitizerBroken skips t if the C compiler does not produce working
+// binaries as configured.
+func (c *config) skipIfCSanitizerBroken(t *testing.T) {
+	check := &c.sanitizerCheck
+	check.once.Do(func() {
+		check.skip, check.err = c.checkCSanitizer()
+	})
+	if check.err != nil {
+		t.Helper()
+		if check.skip {
+			t.Skip(check.err)
+		}
+		t.Fatal(check.err)
+	}
+}
+
+var cMain = []byte(`
+int main() {
+	return 0;
+}
+`)
+
+func (c *config) checkCSanitizer() (skip bool, err error) {
+	dir, err := ioutil.TempDir("", c.sanitizer)
+	if err != nil {
+		return false, fmt.Errorf("failed to create temp directory: %v", err)
+	}
+	defer os.RemoveAll(dir)
+
+	src := filepath.Join(dir, "return0.c")
+	if err := ioutil.WriteFile(src, cMain, 0600); err != nil {
+		return false, fmt.Errorf("failed to write C source file: %v", err)
+	}
+
+	dst := filepath.Join(dir, "return0")
+	cmd, err := cc(c.cFlags...)
+	if err != nil {
+		return false, err
+	}
+	cmd.Args = append(cmd.Args, c.ldFlags...)
+	cmd.Args = append(cmd.Args, "-o", dst, src)
+	out, err := cmd.CombinedOutput()
+	if err != nil {
+		if bytes.Contains(out, []byte("-fsanitize")) &&
+			(bytes.Contains(out, []byte("unrecognized")) ||
+				bytes.Contains(out, []byte("unsupported"))) {
+			return true, errors.New(string(out))
+		}
+		return true, fmt.Errorf("%#q failed: %v\n%s", strings.Join(cmd.Args, " "), err, out)
+	}
+
+	if out, err := exec.Command(dst).CombinedOutput(); err != nil {
+		if os.IsNotExist(err) {
+			return true, fmt.Errorf("%#q failed to produce executable: %v", strings.Join(cmd.Args, " "), err)
+		}
+		snippet := bytes.SplitN(out, []byte{'\n'}, 2)[0]
+		return true, fmt.Errorf("%#q generated broken executable: %v\n%s", strings.Join(cmd.Args, " "), err, snippet)
+	}
+
+	return false, nil
+}
+
+// skipIfRuntimeIncompatible skips t if the Go runtime is suspected not to work
+// with cgo as configured.
+func (c *config) skipIfRuntimeIncompatible(t *testing.T) {
+	check := &c.runtimeCheck
+	check.once.Do(func() {
+		check.skip, check.err = c.checkRuntime()
+	})
+	if check.err != nil {
+		t.Helper()
+		if check.skip {
+			t.Skip(check.err)
+		}
+		t.Fatal(check.err)
+	}
+}
+
+func (c *config) checkRuntime() (skip bool, err error) {
+	if c.sanitizer != "thread" {
+		return false, nil
+	}
+
+	// libcgo.h sets CGO_TSAN if it detects TSAN support in the C compiler.
+	// Dump the preprocessor defines to check that that works.
+	// (Sometimes it doesn't: see https://golang.org/issue/15983.)
+	cmd, err := cc(c.cFlags...)
+	if err != nil {
+		return false, err
+	}
+	cmd.Args = append(cmd.Args, "-dM", "-E", "../../../src/runtime/cgo/libcgo.h")
+	out, err := cmd.CombinedOutput()
+	if err != nil {
+		return false, fmt.Errorf("%#q exited with %v\n%s", strings.Join(cmd.Args, " "), err, out)
+	}
+	if !bytes.Contains(out, []byte("#define CGO_TSAN")) {
+		return true, fmt.Errorf("%#q did not define CGO_TSAN")
+	}
+	return false, nil
+}
+
+// srcPath returns the path to the given file relative to this test's source tree.
+func srcPath(path string) string {
+	return filepath.Join("src", path)
+}
+
+// A tempDir manages a temporary directory within a test.
+type tempDir struct {
+	base string
+}
+
+func (d *tempDir) RemoveAll(t *testing.T) {
+	t.Helper()
+	if d.base == "" {
+		return
+	}
+	if err := os.RemoveAll(d.base); err != nil {
+		t.Fatal("Failed to remove temp dir: %v", err)
+	}
+}
+
+func (d *tempDir) Join(name string) string {
+	return filepath.Join(d.base, name)
+}
+
+func newTempDir(t *testing.T) *tempDir {
+	t.Helper()
+	dir, err := ioutil.TempDir("", filepath.Dir(t.Name()))
+	if err != nil {
+		t.Fatalf("Failed to create temp dir: %v", err)
+	}
+	return &tempDir{base: dir}
+}
+
+// hangProneCmd returns an exec.Cmd for a command that is likely to hang.
+//
+// If one of these tests hangs, the caller is likely to kill the test process
+// using SIGINT, which will be sent to all of the processes in the test's group.
+// Unfortunately, TSAN in particular is prone to dropping signals, so the SIGINT
+// may terminate the test binary but leave the subprocess running. hangProneCmd
+// configures subprocess to receive SIGKILL instead to ensure that it won't
+// leak.
+func hangProneCmd(name string, arg ...string) *exec.Cmd {
+	cmd := exec.Command(name, arg...)
+	cmd.SysProcAttr = &syscall.SysProcAttr{
+		Pdeathsig: syscall.SIGKILL,
+	}
+	return cmd
+}
diff --git a/misc/cgo/testsanitizers/cshared_test.go b/misc/cgo/testsanitizers/cshared_test.go
new file mode 100644
index 0000000000..56063ea620
--- /dev/null
+++ b/misc/cgo/testsanitizers/cshared_test.go
@@ -0,0 +1,74 @@
+// 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 sanitizers_test
+
+import (
+	"fmt"
+	"io/ioutil"
+	"strings"
+	"testing"
+)
+
+func TestShared(t *testing.T) {
+	t.Parallel()
+	requireOvercommit(t)
+
+	GOOS, err := goEnv("GOOS")
+	if err != nil {
+		t.Fatal(err)
+	}
+	libExt := "so"
+	if GOOS == "darwin" {
+		libExt = "dylib"
+	}
+
+	cases := []struct {
+		src       string
+		sanitizer string
+	}{
+		{
+			src:       "msan_shared.go",
+			sanitizer: "memory",
+		},
+		{
+			src:       "tsan_shared.go",
+			sanitizer: "thread",
+		},
+	}
+
+	for _, tc := range cases {
+		tc := tc
+		name := strings.TrimSuffix(tc.src, ".go")
+		t.Run(name, func(t *testing.T) {
+			t.Parallel()
+			config := configure(tc.sanitizer)
+			config.skipIfCSanitizerBroken(t)
+
+			dir := newTempDir(t)
+			defer dir.RemoveAll(t)
+
+			lib := dir.Join(fmt.Sprintf("lib%s.%s", name, libExt))
+			mustRun(t, config.goCmd("build", "-buildmode=c-shared", "-o", lib, srcPath(tc.src)))
+
+			cSrc := dir.Join("main.c")
+			if err := ioutil.WriteFile(cSrc, cMain, 0600); err != nil {
+				t.Fatalf("failed to write C source file: %v", err)
+			}
+
+			dstBin := dir.Join(name)
+			cmd, err := cc(config.cFlags...)
+			if err != nil {
+				t.Fatal(err)
+			}
+			cmd.Args = append(cmd.Args, config.ldFlags...)
+			cmd.Args = append(cmd.Args, "-o", dstBin, cSrc, lib)
+			mustRun(t, cmd)
+
+			cmd = hangProneCmd(dstBin)
+			replaceEnv(cmd, "LD_LIBRARY_PATH", ".")
+			mustRun(t, cmd)
+		})
+	}
+}
diff --git a/misc/cgo/testsanitizers/msan_test.go b/misc/cgo/testsanitizers/msan_test.go
new file mode 100644
index 0000000000..af5afa9ee4
--- /dev/null
+++ b/misc/cgo/testsanitizers/msan_test.go
@@ -0,0 +1,55 @@
+// 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 sanitizers_test
+
+import (
+	"strings"
+	"testing"
+)
+
+func TestMSAN(t *testing.T) {
+	t.Parallel()
+	requireOvercommit(t)
+	config := configure("memory")
+	config.skipIfCSanitizerBroken(t)
+
+	mustRun(t, config.goCmd("build", "std"))
+
+	cases := []struct {
+		src     string
+		wantErr bool
+	}{
+		{src: "msan.go"},
+		{src: "msan2.go"},
+		{src: "msan2_cmsan.go"},
+		{src: "msan3.go"},
+		{src: "msan4.go"},
+		{src: "msan5.go"},
+		{src: "msan_fail.go", wantErr: true},
+	}
+	for _, tc := range cases {
+		tc := tc
+		name := strings.TrimSuffix(tc.src, ".go")
+		t.Run(name, func(t *testing.T) {
+			t.Parallel()
+
+			dir := newTempDir(t)
+			defer dir.RemoveAll(t)
+
+			outPath := dir.Join(name)
+			mustRun(t, config.goCmd("build", "-o", outPath, srcPath(tc.src)))
+
+			cmd := hangProneCmd(outPath)
+			if tc.wantErr {
+				out, err := cmd.CombinedOutput()
+				if err != nil {
+					return
+				}
+				t.Fatalf("%#q exited without error; want MSAN failure\n%s", strings.Join(cmd.Args, " "), out)
+			}
+			mustRun(t, cmd)
+		})
+	}
+}
diff --git a/misc/cgo/testsanitizers/msan.go b/misc/cgo/testsanitizers/src/msan.go
index 7915fa84f6..7915fa84f6 100644
--- a/misc/cgo/testsanitizers/msan.go
+++ b/misc/cgo/testsanitizers/src/msan.go
diff --git a/misc/cgo/testsanitizers/msan2.go b/misc/cgo/testsanitizers/src/msan2.go
index 6690cb034f..6690cb034f 100644
--- a/misc/cgo/testsanitizers/msan2.go
+++ b/misc/cgo/testsanitizers/src/msan2.go
diff --git a/misc/cgo/testsanitizers/src/msan2_cmsan.go b/misc/cgo/testsanitizers/src/msan2_cmsan.go
new file mode 100644
index 0000000000..8fdaea90c9
--- /dev/null
+++ b/misc/cgo/testsanitizers/src/msan2_cmsan.go
@@ -0,0 +1,38 @@
+// Copyright 2015 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
+
+/*
+#cgo LDFLAGS: -fsanitize=memory
+#cgo CPPFLAGS: -fsanitize=memory
+
+#include <string.h>
+#include <stdint.h>
+#include <stdlib.h>
+
+void f(int32_t *p, int n) {
+  int32_t * volatile q = (int32_t *)malloc(sizeof(int32_t) * n);
+  memcpy(p, q, n * sizeof(*p));
+  free(q);
+}
+
+void g(int32_t *p, int n) {
+  if (p[4] != 1) {
+    abort();
+  }
+}
+*/
+import "C"
+
+import (
+	"unsafe"
+)
+
+func main() {
+	a := make([]int32, 10)
+	C.f((*C.int32_t)(unsafe.Pointer(&a[0])), C.int(len(a)))
+	a[4] = 1
+	C.g((*C.int32_t)(unsafe.Pointer(&a[0])), C.int(len(a)))
+}
diff --git a/misc/cgo/testsanitizers/msan3.go b/misc/cgo/testsanitizers/src/msan3.go
index 61a9c29e1a..61a9c29e1a 100644
--- a/misc/cgo/testsanitizers/msan3.go
+++ b/misc/cgo/testsanitizers/src/msan3.go
diff --git a/misc/cgo/testsanitizers/msan4.go b/misc/cgo/testsanitizers/src/msan4.go
index 6c91ff5f09..6c91ff5f09 100644
--- a/misc/cgo/testsanitizers/msan4.go
+++ b/misc/cgo/testsanitizers/src/msan4.go
diff --git a/misc/cgo/testsanitizers/msan5.go b/misc/cgo/testsanitizers/src/msan5.go
index f1479eb8a0..f1479eb8a0 100644
--- a/misc/cgo/testsanitizers/msan5.go
+++ b/misc/cgo/testsanitizers/src/msan5.go
diff --git a/misc/cgo/testsanitizers/msan_fail.go b/misc/cgo/testsanitizers/src/msan_fail.go
index 4c8dab34f6..4c8dab34f6 100644
--- a/misc/cgo/testsanitizers/msan_fail.go
+++ b/misc/cgo/testsanitizers/src/msan_fail.go
diff --git a/misc/cgo/testsanitizers/msan_shared.go b/misc/cgo/testsanitizers/src/msan_shared.go
index 966947cac3..966947cac3 100644
--- a/misc/cgo/testsanitizers/msan_shared.go
+++ b/misc/cgo/testsanitizers/src/msan_shared.go
diff --git a/misc/cgo/testsanitizers/tsan.go b/misc/cgo/testsanitizers/src/tsan.go
index 6c377a701f..6c377a701f 100644
--- a/misc/cgo/testsanitizers/tsan.go
+++ b/misc/cgo/testsanitizers/src/tsan.go
diff --git a/misc/cgo/testsanitizers/tsan10.go b/misc/cgo/testsanitizers/src/tsan10.go
index a40f245553..a40f245553 100644
--- a/misc/cgo/testsanitizers/tsan10.go
+++ b/misc/cgo/testsanitizers/src/tsan10.go
diff --git a/misc/cgo/testsanitizers/tsan11.go b/misc/cgo/testsanitizers/src/tsan11.go
index 70ac9c8ae2..70ac9c8ae2 100644
--- a/misc/cgo/testsanitizers/tsan11.go
+++ b/misc/cgo/testsanitizers/src/tsan11.go
diff --git a/misc/cgo/testsanitizers/tsan12.go b/misc/cgo/testsanitizers/src/tsan12.go
index 3e767eee1f..3e767eee1f 100644
--- a/misc/cgo/testsanitizers/tsan12.go
+++ b/misc/cgo/testsanitizers/src/tsan12.go
diff --git a/misc/cgo/testsanitizers/tsan2.go b/misc/cgo/testsanitizers/src/tsan2.go
index 5018a1987c..5018a1987c 100644
--- a/misc/cgo/testsanitizers/tsan2.go
+++ b/misc/cgo/testsanitizers/src/tsan2.go
diff --git a/misc/cgo/testsanitizers/tsan3.go b/misc/cgo/testsanitizers/src/tsan3.go
index 87f6c80f1b..87f6c80f1b 100644
--- a/misc/cgo/testsanitizers/tsan3.go
+++ b/misc/cgo/testsanitizers/src/tsan3.go
diff --git a/misc/cgo/testsanitizers/tsan4.go b/misc/cgo/testsanitizers/src/tsan4.go
index f0c76d8411..f0c76d8411 100644
--- a/misc/cgo/testsanitizers/tsan4.go
+++ b/misc/cgo/testsanitizers/src/tsan4.go
diff --git a/misc/cgo/testsanitizers/tsan5.go b/misc/cgo/testsanitizers/src/tsan5.go
index 1214a7743b..1214a7743b 100644
--- a/misc/cgo/testsanitizers/tsan5.go
+++ b/misc/cgo/testsanitizers/src/tsan5.go
diff --git a/misc/cgo/testsanitizers/tsan6.go b/misc/cgo/testsanitizers/src/tsan6.go
index c96f08d2f3..c96f08d2f3 100644
--- a/misc/cgo/testsanitizers/tsan6.go
+++ b/misc/cgo/testsanitizers/src/tsan6.go
diff --git a/misc/cgo/testsanitizers/tsan7.go b/misc/cgo/testsanitizers/src/tsan7.go
index 2fb9e45ee2..2fb9e45ee2 100644
--- a/misc/cgo/testsanitizers/tsan7.go
+++ b/misc/cgo/testsanitizers/src/tsan7.go
diff --git a/misc/cgo/testsanitizers/tsan8.go b/misc/cgo/testsanitizers/src/tsan8.go
index 88d82a6078..88d82a6078 100644
--- a/misc/cgo/testsanitizers/tsan8.go
+++ b/misc/cgo/testsanitizers/src/tsan8.go
diff --git a/misc/cgo/testsanitizers/tsan9.go b/misc/cgo/testsanitizers/src/tsan9.go
index f166d8b495..f166d8b495 100644
--- a/misc/cgo/testsanitizers/tsan9.go
+++ b/misc/cgo/testsanitizers/src/tsan9.go
diff --git a/misc/cgo/testsanitizers/tsan_shared.go b/misc/cgo/testsanitizers/src/tsan_shared.go
index 55ff67ecba..55ff67ecba 100644
--- a/misc/cgo/testsanitizers/tsan_shared.go
+++ b/misc/cgo/testsanitizers/src/tsan_shared.go
diff --git a/misc/cgo/testsanitizers/test.bash b/misc/cgo/testsanitizers/test.bash
deleted file mode 100755
index 9f80af6c50..0000000000
--- a/misc/cgo/testsanitizers/test.bash
+++ /dev/null
@@ -1,233 +0,0 @@
-#!/usr/bin/env bash
-# Copyright 2015 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.
-
-# This directory is intended to test the use of Go with sanitizers
-# like msan, asan, etc.  See https://github.com/google/sanitizers .
-
-set -e
-
-# The sanitizers were originally developed with clang, so prefer it.
-CC=cc
-if test -x "$(type -p clang)"; then
-  CC=clang
-fi
-export CC
-
-if [ "$(sysctl -n vm.overcommit_memory)" = 2 ]; then
-  echo "skipping msan/tsan tests: vm.overcommit_memory=2" >&2
-  exit 0
-fi
-
-msan=yes
-
-TMPDIR=${TMPDIR:-/tmp}
-echo 'int main() { return 0; }' > ${TMPDIR}/testsanitizers$$.c
-if $CC -fsanitize=memory -o ${TMPDIR}/testsanitizers$$ ${TMPDIR}/testsanitizers$$.c 2>&1 | grep "unrecognized" >& /dev/null; then
-  echo "skipping msan tests: $CC -fsanitize=memory not supported"
-  msan=no
-elif ! test -x ${TMPDIR}/testsanitizers$$; then
-  echo "skipping msan tests: $CC -fsanitize-memory did not generate an executable"
-  msan=no
-elif ! ${TMPDIR}/testsanitizers$$ >/dev/null 2>&1; then
-  echo "skipping msan tests: $CC -fsanitize-memory generates broken executable"
-  msan=no
-fi
-rm -f ${TMPDIR}/testsanitizers$$.*
-
-tsan=yes
-
-# The memory and thread sanitizers in versions of clang before 3.6
-# don't work with Go.
-if test "$msan" = "yes" && $CC --version | grep clang >& /dev/null; then
-  ver=$($CC --version | sed -e 's/.* version \([0-9.-]*\).*/\1/')
-  major=$(echo $ver | sed -e 's/\([0-9]*\).*/\1/')
-  minor=$(echo $ver | sed -e 's/[0-9]*\.\([0-9]*\).*/\1/')
-  if test "$major" -lt 3 || test "$major" -eq 3 -a "$minor" -lt 6; then
-    echo "skipping msan/tsan tests: clang version $major.$minor (older than 3.6)"
-    msan=no
-    tsan=no
-  fi
-
-  # Clang before 3.8 does not work with Linux at or after 4.1.
-  # golang.org/issue/12898.
-  if test "$msan" = "yes" -a "$major" -lt 3 || test "$major" -eq 3 -a "$minor" -lt 8; then
-    if test "$(uname)" = Linux; then
-      linuxver=$(uname -r)
-      linuxmajor=$(echo $linuxver | sed -e 's/\([0-9]*\).*/\1/')
-      linuxminor=$(echo $linuxver | sed -e 's/[0-9]*\.\([0-9]*\).*/\1/')
-      if test "$linuxmajor" -gt 4 || test "$linuxmajor" -eq 4 -a "$linuxminor" -ge 1; then
-        echo "skipping msan/tsan tests: clang version $major.$minor (older than 3.8) incompatible with linux version $linuxmajor.$linuxminor (4.1 or newer)"
-	msan=no
-	tsan=no
-      fi
-    fi
-  fi
-fi
-
-status=0
-
-testmsanshared() {
-  goos=$(go env GOOS)
-  suffix="-installsuffix testsanitizers"
-  libext="so"
-  if [ "$goos" = "darwin" ]; then
-	  libext="dylib"
-  fi
-  go build -msan -buildmode=c-shared $suffix -o ${TMPDIR}/libmsanshared.$libext msan_shared.go
-
-  echo 'int main() { return 0; }' > ${TMPDIR}/testmsanshared.c
-  $CC $(go env GOGCCFLAGS) -fsanitize=memory -o ${TMPDIR}/testmsanshared ${TMPDIR}/testmsanshared.c ${TMPDIR}/libmsanshared.$libext
-
-  if ! LD_LIBRARY_PATH=. ${TMPDIR}/testmsanshared; then
-    echo "FAIL: msan_shared"
-    status=1
-  fi
-  rm -f ${TMPDIR}/{testmsanshared,testmsanshared.c,libmsanshared.$libext}
-}
-
-if test "$msan" = "yes"; then
-    if ! go build -msan std; then
-	echo "FAIL: build -msan std"
-	status=1
-    fi
-
-    if ! go run -msan msan.go; then
-	echo "FAIL: msan"
-	status=1
-    fi
-
-    if ! CGO_LDFLAGS="-fsanitize=memory" CGO_CPPFLAGS="-fsanitize=memory" go run -msan -a msan2.go; then
-	echo "FAIL: msan2 with -fsanitize=memory"
-	status=1
-    fi
-
-    if ! go run -msan -a msan2.go; then
-	echo "FAIL: msan2"
-	status=1
-    fi
-
-    if ! go run -msan msan3.go; then
-	echo "FAIL: msan3"
-	status=1
-    fi
-
-    if ! go run -msan msan4.go; then
-	echo "FAIL: msan4"
-	status=1
-    fi
-
-    if ! go run -msan msan5.go; then
-	echo "FAIL: msan5"
-	status=1
-    fi
-
-    if go run -msan msan_fail.go 2>/dev/null; then
-	echo "FAIL: msan_fail"
-	status=1
-    fi
-
-    testmsanshared
-fi
-
-testtsanshared() {
-  goos=$(go env GOOS)
-  suffix="-installsuffix tsan"
-  libext="so"
-  if [ "$goos" = "darwin" ]; then
-	  libext="dylib"
-  fi
-  go build -buildmode=c-shared $suffix -o ${TMPDIR}/libtsanshared.$libext tsan_shared.go
-
-  echo 'int main() { return 0; }' > ${TMPDIR}/testtsanshared.c
-  $CC $(go env GOGCCFLAGS) -fsanitize=thread -o ${TMPDIR}/testtsanshared ${TMPDIR}/testtsanshared.c ${TMPDIR}/libtsanshared.$libext
-
-  if ! LD_LIBRARY_PATH=. ${TMPDIR}/testtsanshared; then
-    echo "FAIL: tsan_shared"
-    status=1
-  fi
-  rm -f ${TMPDIR}/{testtsanshared,testtsanshared.c,libtsanshared.$libext}
-}
-
-if test "$tsan" = "yes"; then
-    echo 'int main() { return 0; }' > ${TMPDIR}/testsanitizers$$.c
-    ok=yes
-    if ! $CC -fsanitize=thread ${TMPDIR}/testsanitizers$$.c -o ${TMPDIR}/testsanitizers$$ &> ${TMPDIR}/testsanitizers$$.err; then
-	ok=no
-    fi
-    if grep "unrecognized" ${TMPDIR}/testsanitizers$$.err >& /dev/null; then
-	echo "skipping tsan tests: -fsanitize=thread not supported"
-	tsan=no
-    elif test "$ok" != "yes"; then
-	cat ${TMPDIR}/testsanitizers$$.err
-	echo "skipping tsan tests: -fsanitizer=thread build failed"
-	tsan=no
-    elif ! ${TMPDIR}/testsanitizers$$ 2>&1; then
-	echo "skipping tsan tests: running tsan program failed"
-	tsan=no
-    fi
-    rm -f ${TMPDIR}/testsanitizers$$*
-fi
-
-# Run a TSAN test.
-# $1 test name
-# $2 environment variables
-# $3 go run args
-testtsan() {
-    err=${TMPDIR}/tsanerr$$.out
-    if ! env $2 go run $3 $1 2>$err; then
-	cat $err
-	echo "FAIL: $1"
-	status=1
-    elif grep -i warning $err >/dev/null 2>&1; then
-	cat $err
-	echo "FAIL: $1"
-	status=1
-    fi
-    rm -f $err
-}
-
-if test "$tsan" = "yes"; then
-    testtsan tsan.go
-    testtsan tsan2.go
-    testtsan tsan3.go
-    testtsan tsan4.go
-    testtsan tsan8.go
-    testtsan tsan9.go
-
-    # These tests are only reliable using clang or GCC version 7 or later.
-    # Otherwise runtime/cgo/libcgo.h can't tell whether TSAN is in use.
-    ok=false
-    clang=false
-    if ${CC} --version | grep clang >/dev/null 2>&1; then
-	ok=true
-	clang=true
-    else
-	ver=$($CC -dumpversion)
-	major=$(echo $ver | sed -e 's/\([0-9]*\).*/\1/')
-	if test "$major" -lt 7; then
-	    echo "skipping remaining TSAN tests: GCC version $major (older than 7)"
-	else
-	    ok=true
-	fi
-    fi
-
-    if test "$ok" = "true"; then
-	# These tests require rebuilding os/user with -fsanitize=thread.
-	testtsan tsan5.go "CGO_CFLAGS=-fsanitize=thread CGO_LDFLAGS=-fsanitize=thread" "-installsuffix=tsan"
-	testtsan tsan6.go "CGO_CFLAGS=-fsanitize=thread CGO_LDFLAGS=-fsanitize=thread" "-installsuffix=tsan"
-	testtsan tsan7.go "CGO_CFLAGS=-fsanitize=thread CGO_LDFLAGS=-fsanitize=thread" "-installsuffix=tsan"
-
-	# The remaining tests reportedly hang when built with GCC; issue #21196.
-	if test "$clang" = "true"; then
-	    testtsan tsan10.go "CGO_CFLAGS=-fsanitize=thread CGO_LDFLAGS=-fsanitize=thread" "-installsuffix=tsan"
-	    testtsan tsan11.go "CGO_CFLAGS=-fsanitize=thread CGO_LDFLAGS=-fsanitize=thread" "-installsuffix=tsan"
-	    testtsan tsan12.go "CGO_CFLAGS=-fsanitize=thread CGO_LDFLAGS=-fsanitize=thread" "-installsuffix=tsan"
-	fi
-
-	testtsanshared
-    fi
-fi
-
-exit $status
diff --git a/misc/cgo/testsanitizers/tsan_test.go b/misc/cgo/testsanitizers/tsan_test.go
new file mode 100644
index 0000000000..ec4e0033fb
--- /dev/null
+++ b/misc/cgo/testsanitizers/tsan_test.go
@@ -0,0 +1,56 @@
+// 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 sanitizers_test
+
+import (
+	"strings"
+	"testing"
+)
+
+func TestTSAN(t *testing.T) {
+	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"},
+		{src: "tsan2.go"},
+		{src: "tsan3.go"},
+		{src: "tsan4.go"},
+		{src: "tsan5.go", needsRuntime: true},
+		{src: "tsan6.go", needsRuntime: true},
+		{src: "tsan7.go", needsRuntime: true},
+		{src: "tsan8.go"},
+		{src: "tsan9.go"},
+		{src: "tsan10.go", needsRuntime: true},
+		{src: "tsan11.go", needsRuntime: true},
+		{src: "tsan12.go", needsRuntime: true},
+	}
+	for _, tc := range cases {
+		tc := tc
+		name := strings.TrimSuffix(tc.src, ".go")
+		t.Run(name, func(t *testing.T) {
+			t.Parallel()
+
+			dir := newTempDir(t)
+			defer dir.RemoveAll(t)
+
+			outPath := dir.Join(name)
+			mustRun(t, config.goCmd("build", "-o", outPath, srcPath(tc.src)))
+
+			cmd := hangProneCmd(outPath)
+			if tc.needsRuntime {
+				config.skipIfRuntimeIncompatible(t)
+			}
+			mustRun(t, cmd)
+		})
+	}
+}
diff --git a/src/cmd/dist/test.go b/src/cmd/dist/test.go
index 6052904cbf..79338b3721 100644
--- a/src/cmd/dist/test.go
+++ b/src/cmd/dist/test.go
@@ -620,7 +620,7 @@ func (t *tester) registerTests() {
 			t.registerTest("testasan", "../misc/cgo/testasan", "go", "run", "main.go")
 		}
 		if t.goos == "linux" && t.goarch == "amd64" {
-			t.registerTest("testsanitizers", "../misc/cgo/testsanitizers", "./test.bash")
+			t.registerHostTest("testsanitizers/msan", "../misc/cgo/testsanitizers", "misc/cgo/testsanitizers", ".")
 		}
 		if t.hasBash() && t.goos != "android" && !t.iOS() && t.gohostos != "windows" {
 			t.registerTest("cgo_errors", "../misc/cgo/errors", "./test.bash")