Remove unnecessary calls to rand.Seed(time.Now().Unix()).

As per https://pkg.go.dev/math/rand#Seed:
"If Seed is not called, the generator is seeded randomly at program startup."
"Prior to Go 1.20, the generator was seeded like Seed(1) at program startup. To
force the old behavior, call Seed(1) at program startup."
"As of Go 1.20 there is no reason to call Seed with a random value."

rand.Seed() is deprecated. Followup to #11015.

PiperOrigin-RevId: 685052229

pkg/compressio/compressio_test.go

@@ -154,8 +154,6 @@ func doTest(t harness, opts testOpts) {
 var hashKey = []byte("01234567890123456789012345678901")
 
 func TestCompress(t *testing.T) {
-	rand.Seed(time.Now().Unix())
-
 	var (
 		data  = initTest(t, 10*1024*1024)
 		data0 = data[:0]

pkg/compressio/nocompressio_test.go

@@ -18,14 +18,10 @@ import (
 	"bytes"
 	"fmt"
 	"io"
-	"math/rand"
 	"testing"
-	"time"
 )
 
 func TestNoCompress(t *testing.T) {
-	rand.Seed(time.Now().Unix())
-
 	var (
 		data  = initTest(t, 10*1024*1024)
 		data0 = data[:0]

pkg/state/statefile/statefile_test.go

@@ -22,7 +22,6 @@ import (
 	"math/rand"
 	"runtime"
 	"testing"
-	"time"
 
 	"gvisor.dev/gvisor/pkg/compressio"
 )
@@ -44,8 +43,6 @@ type testCase struct {
 }
 
 func TestStatefile(t *testing.T) {
-	rand.Seed(time.Now().Unix())
-
 	compression := map[string]CompressionLevel{
 		"none":       CompressionLevelNone,
 		"compressed": CompressionLevelFlateBestSpeed,

pkg/tcpip/sample/tun_tcp_connect/main.go

@@ -45,11 +45,9 @@ import (
 	"bytes"
 	"fmt"
 	"log"
-	"math/rand"
 	"net"
 	"os"
 	"strconv"
-	"time"
 
 	"gvisor.dev/gvisor/pkg/rawfile"
 	"gvisor.dev/gvisor/pkg/tcpip"
@@ -100,8 +98,6 @@ func main() {
 	remoteAddrName := os.Args[4]
 	remotePortName := os.Args[5]
 
-	rand.Seed(time.Now().UnixNano())
-
 	addr := tcpip.AddrFromSlice(net.ParseIP(addrName).To4())
 	remote := tcpip.FullAddress{
 		NIC:  1,

pkg/tcpip/sample/tun_tcp_echo/main.go

@@ -25,12 +25,10 @@ import (
 	"flag"
 	"io"
 	"log"
-	"math/rand"
 	"net"
 	"os"
 	"strconv"
 	"strings"
-	"time"
 
 	"gvisor.dev/gvisor/pkg/rawfile"
 	"gvisor.dev/gvisor/pkg/tcpip"
@@ -113,8 +111,6 @@ func main() {
 	addrName := flag.Arg(1)
 	portName := flag.Arg(2)
 
-	rand.Seed(time.Now().UnixNano())
-
 	// Parse the mac address.
 	maddr, err := net.ParseMAC(*mac)
 	if err != nil {

runsc/boot/loader.go

@@ -19,7 +19,6 @@ import (
 	"encoding/json"
 	"errors"
 	"fmt"
-	mrand "math/rand"
 	"os"
 	"runtime"
 	"strconv"
@@ -294,11 +293,6 @@ type FDMapping struct {
 	Host  int
 }
 
-func init() {
-	// Initialize the random number generator.
-	mrand.Seed(gtime.Now().UnixNano())
-}
-
 // Args are the arguments for New().
 type Args struct {
 	// Id is the sandbox ID.

runsc/boot/loader_test.go

@@ -41,7 +41,6 @@ import (
 
 func init() {
 	log.SetLevel(log.Debug)
-	rand.Seed(time.Now().UnixNano())
 	if err := fsgofer.OpenProcSelfFD("/proc/self/fd"); err != nil {
 		panic(err)
 	}

test/benchmarks/tcp/tcp_proxy.go

@@ -398,10 +398,6 @@ func main() {
 	if *forward == "" {
 		log.Fatalf("no forward provided")
 	}
-	// Seed the random number generator to ensure that we are given MAC addresses that don't
-	// for the case of the client and server stack.
-	rand.Seed(time.Now().UTC().UnixNano())
-
 	if *cpuprofile != "" {
 		f, err := os.Create(*cpuprofile)
 		if err != nil {

test/fsstress/fsstress_test.go

@@ -24,17 +24,12 @@ import (
 	"strconv"
 	"strings"
 	"testing"
-	"time"
 
 	"github.com/docker/docker/api/types/mount"
 	"gvisor.dev/gvisor/pkg/test/dockerutil"
 	"gvisor.dev/gvisor/pkg/test/testutil"
 )
 
-func init() {
-	rand.Seed(int64(time.Now().Nanosecond()))
-}
-
 func TestMain(m *testing.M) {
 	dockerutil.EnsureSupportedDockerVersion()
 	flag.Parse()