diff --git a/internal/testutil/testutil.go b/internal/testutil/testutil.go
deleted file mode 100644
index 9df3ed1f68e..00000000000
--- a/internal/testutil/testutil.go
+++ /dev/null
@@ -1,30 +0,0 @@
-package testutil
-
-import (
-	"os/exec"
-	"strconv"
-	"sync"
-	"testing"
-)
-
-var (
-	centosVer     string
-	centosVerOnce sync.Once
-)
-
-func centosVersion() string {
-	centosVerOnce.Do(func() {
-		ver, _ := exec.Command("rpm", "-q", "--qf", "%{version}", "centos-release").CombinedOutput()
-		centosVer = string(ver)
-	})
-	return centosVer
-}
-
-func SkipOnCentOS(t *testing.T, reason string, versions ...int) {
-	t.Helper()
-	for _, v := range versions {
-		if vstr := strconv.Itoa(v); centosVersion() == vstr {
-			t.Skip(reason + " on CentOS " + vstr)
-		}
-	}
-}
diff --git a/libcontainer/cgroups/devices/systemd_test.go b/libcontainer/cgroups/devices/systemd_test.go
index 7bae2f7406a..2ab4b253529 100644
--- a/libcontainer/cgroups/devices/systemd_test.go
+++ b/libcontainer/cgroups/devices/systemd_test.go
@@ -8,7 +8,6 @@ import (
 	"strings"
 	"testing"
 
-	"github.com/opencontainers/runc/internal/testutil"
 	"github.com/opencontainers/runc/libcontainer/cgroups"
 	"github.com/opencontainers/runc/libcontainer/cgroups/systemd"
 	"github.com/opencontainers/runc/libcontainer/configs"
@@ -27,8 +26,6 @@ func TestPodSkipDevicesUpdate(t *testing.T) {
 	if os.Geteuid() != 0 {
 		t.Skip("Test requires root.")
 	}
-	// https://github.com/opencontainers/runc/issues/3743.
-	testutil.SkipOnCentOS(t, "Flaky (#3743)", 7)
 
 	podName := "system-runc_test_pod" + t.Name() + ".slice"
 	podConfig := &configs.Cgroup{
@@ -126,8 +123,6 @@ func testSkipDevices(t *testing.T, skipDevices bool, expected []string) {
 	if os.Geteuid() != 0 {
 		t.Skip("Test requires root.")
 	}
-	// https://github.com/opencontainers/runc/issues/3743.
-	testutil.SkipOnCentOS(t, "Flaky (#3743)", 7)
 
 	podConfig := &configs.Cgroup{
 		Parent: "system.slice",
diff --git a/libcontainer/cgroups/file_test.go b/libcontainer/cgroups/file_test.go
index 5ce43838018..3a9fac32935 100644
--- a/libcontainer/cgroups/file_test.go
+++ b/libcontainer/cgroups/file_test.go
@@ -8,13 +8,9 @@ import (
 	"strconv"
 	"testing"
 	"time"
-
-	"github.com/opencontainers/runc/internal/testutil"
 )
 
 func TestWriteCgroupFileHandlesInterrupt(t *testing.T) {
-	testutil.SkipOnCentOS(t, "Flaky (see #3418)", 7)
-
 	const (
 		memoryCgroupMount = "/sys/fs/cgroup/memory"
 		memoryLimit       = "memory.limit_in_bytes"