diff --git a/pkg/internal/testing/process/procattr_other.go b/pkg/internal/testing/process/procattr_other.go
new file mode 100644
index 0000000000..03c0265483
--- /dev/null
+++ b/pkg/internal/testing/process/procattr_other.go
@@ -0,0 +1,28 @@
+//go:build (!aix && !darwin && !dragonfly && !freebsd && !linux && !netbsd && !openbsd && !solaris && !zos) || !go1.9
+// +build !aix,!darwin,!dragonfly,!freebsd,!linux,!netbsd,!openbsd,!solaris,!zos !go1.9
+
+/*
+Copyright 2016 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package process
+
+import "syscall"
+
+// getSysProcAttr returns the SysProcAttr to use for the process,
+// for non-unix systems this returns nil.
+func getSysProcAttr() *syscall.SysProcAttr {
+	return nil
+}
diff --git a/pkg/internal/testing/process/procattr_unix.go b/pkg/internal/testing/process/procattr_unix.go
new file mode 100644
index 0000000000..531c2f8ed7
--- /dev/null
+++ b/pkg/internal/testing/process/procattr_unix.go
@@ -0,0 +1,34 @@
+//go:build (aix || darwin || dragonfly || freebsd || linux || netbsd || openbsd || solaris || zos) && go1.9
+// +build aix darwin dragonfly freebsd linux netbsd openbsd solaris zos
+// +build go1.9
+
+/*
+Copyright 2023 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package process
+
+import (
+	"golang.org/x/sys/unix"
+)
+
+// getSysProcAttr returns the SysProcAttr to use for the process,
+// for unix systems this returns a SysProcAttr with Setpgid set to true,
+// which inherits the parent's process group id.
+func getSysProcAttr() *unix.SysProcAttr {
+	return &unix.SysProcAttr{
+		Setpgid: true,
+	}
+}
diff --git a/pkg/internal/testing/process/process.go b/pkg/internal/testing/process/process.go
index af83c70a2f..1ad2938802 100644
--- a/pkg/internal/testing/process/process.go
+++ b/pkg/internal/testing/process/process.go
@@ -155,6 +155,7 @@ func (ps *State) Start(stdout, stderr io.Writer) (err error) {
 	ps.Cmd = exec.Command(ps.Path, ps.Args...)
 	ps.Cmd.Stdout = stdout
 	ps.Cmd.Stderr = stderr
+	ps.Cmd.SysProcAttr = getSysProcAttr()
 
 	ready := make(chan bool)
 	timedOut := time.After(ps.StartTimeout)
@@ -265,6 +266,9 @@ func (ps *State) Stop() error {
 	case <-ps.waitDone:
 		break
 	case <-timedOut:
+		if err := ps.Cmd.Process.Signal(syscall.SIGKILL); err != nil {
+			return fmt.Errorf("unable to kill process %s: %w", ps.Path, err)
+		}
 		return fmt.Errorf("timeout waiting for process %s to stop", path.Base(ps.Path))
 	}
 	ps.ready = false