Repository: kubernetes/minikube (go)

Issue:
fix minikube mount --kill
### What Happened?

minikube mount --kill should kill all already mount processes spwan by minikube


to reproduce
try to mount 3 different folders
minikube mount -p minikube /tmp:/a1 
minikube mount -p minikube /tmp:/a2
minikube mount -p minikube /tmp:/a3

and then 
minikube mount --kill=true

and expect there be no process

ps aux | grep "minikube mount"

### Attach the log file

n/a

### Operating System

None

### Driver

None

Pull request description:
Fixes mount cleaning mechanism
### MASTER:
```
$ minikube mount -p minikube /tmp:/a1 &
$ minikube mount -p minikube /tmp:/a2 &
$ minikube mount -p minikube /tmp:/a3 &

$ ps -ef | grep "minikube mount"
andrew   1357636 1241621  0 21:30 pts/5    00:00:00 minikube mount -p minikube /tmp:/a1
andrew   1357728 1241621  0 21:30 pts/5    00:00:00 minikube mount -p minikube /tmp:/a2
andrew   1357819 1241621  0 21:30 pts/5    00:00:00 minikube mount -p minikube /tmp:/a3

$ minikube mount --kill=true

$ ps -ef | grep "minikube mount"
andrew   1357636 1241621  0 21:30 pts/5    00:00:00 minikube mount -p minikube /tmp:/a1
andrew   1357728 1241621  0 21:30 pts/5    00:00:00 minikube mount -p minikube /tmp:/a2
andrew   1357819 1241621  0 21:30 pts/5    00:00:00 minikube mount -p minikube /tmp:/a3
```

### FIX:
```
$ minikube mount -p minikube /tmp:/a1 &
$ minikube mount -p minikube /tmp:/a2 &
$ minikube mount -p minikube /tmp:/a3 &

$ ps -ef | grep "minikube mount"
andrew   1360220 1241621  1 21:37 pts/5    00:00:00 minikube mount -p minikube /tmp:/a1
andrew   1360313 1241621  1 21:37 pts/5    00:00:00 minikube mount -p minikube /tmp:/a2
andrew   1360409 1241621  3 21:37 pts/5    00:00:00 minikube mount -p minikube /tmp:/a3

$ minikube mount --kill=true

$ ps -ef | grep "minikube mount"
```
fixes #15778

Patch:
diff --git a/cmd/minikube/cmd/delete.go b/cmd/minikube/cmd/delete.go
index acdf12bc6..74ecf22bf 100644
--- a/cmd/minikube/cmd/delete.go
+++ b/cmd/minikube/cmd/delete.go
@@ -584,9 +584,10 @@ func deleteMachineDirectories(cc *config.ClusterConfig) {
 	}
 }
 
-// killMountProcess kills the mount process, if it is running
+// killMountProcess looks for the legacy path and for profile path for a pidfile,
+// it then tries to kill all the pids listed in the pidfile (one or more)
 func killMountProcess() error {
-	profile := viper.GetString("profile")
+	profile := ClusterFlagValue()
 	paths := []string{
 		localpath.MiniPath(), // legacy mount-process path for backwards compatibility
 		localpath.Profile(profile),
@@ -601,49 +602,120 @@ func killMountProcess() error {
 	return nil
 }
 
+// killProcess takes a path to look for a pidfile (space-separated),
+// it reads the file and converts it to a bunch of pid ints,
+// then it tries to kill each one of them.
+// If no errors were encountered, it cleans the pidfile
 func killProcess(path string) error {
 	pidPath := filepath.Join(path, constants.MountProcessFileName)
 	if _, err := os.Stat(pidPath); os.IsNotExist(err) {
 		return nil
 	}
-
 	klog.Infof("Found %s ...", pidPath)
-	out, err := os.ReadFile(pidPath)
+
+	ppp, err := getPids(pidPath)
 	if err != nil {
-		return errors.Wrap(err, "ReadFile")
+		return err
 	}
-	klog.Infof("pidfile contents: %s", out)
-	pid, err := strconv.Atoi(string(out))
-	if err != nil {
-		return errors.Wrap(err, "error parsing pid")
+
+	// we're trying to kill each process, without stopping at first error encountered
+	// error handling is done below
+	var errs []error
+	for _, pp := range ppp {
+		err := trySigKillProcess(pp)
+		if err != nil {
+			errs = append(errs, err)
+		}
+
 	}
-	// os.FindProcess does not check if pid is running :(
-	entry, err := ps.FindProcess(pid)
+
+	if len(errs) == 1 {
+		// if we've encountered only one error, we're returning it:
+		return errs[0]
+	} else if len(errs) != 0 {
+		// if multiple errors were encountered, combine them into a single error
+		out.Styled(style.Failure, "Multiple errors encountered:")
+		for _, e := range errs {
+			out.Err("%v\n", e)
+		}
+		return errors.New("multiple errors encountered while closing mount processes")
+	}
+
+	// if no errors were encoutered, it's safe to delete pidFile
+	if err := os.Remove(pidPath); err != nil {
+		return errors.Wrap(err, "while closing mount-pids file")
+	}
+
+	return nil
+}
+
+// trySigKillProcess takes a PID as argument and tries to SIGKILL it.
+// It performs an ownership check of the pid,
+// before trying to send a sigkill signal to it
+func trySigKillProcess(pid int) error {
+	itDoes, err := isMinikubeProcess(pid)
 	if err != nil {
-		return errors.Wrap(err, "ps.FindProcess")
+		return err
 	}
-	if entry == nil {
-		klog.Infof("Stale pid: %d", pid)
-		if err := os.Remove(pidPath); err != nil {
-			return errors.Wrap(err, "Removing stale pid")
-		}
-		return nil
+
+	if !itDoes {
+		return fmt.Errorf("stale pid: %d", pid)
 	}
 
-	// We found a process, but it still may not be ours.
-	klog.Infof("Found process %d: %s", pid, entry.Executable())
 	proc, err := os.FindProcess(pid)
 	if err != nil {
-		return errors.Wrap(err, "os.FindProcess")
+		return errors.Wrapf(err, "os.FindProcess: %d", pid)
 	}
 
 	klog.Infof("Killing pid %d ...", pid)
 	if err := proc.Kill(); err != nil {
 		klog.Infof("Kill failed with %v - removing probably stale pid...", err)
-		if err := os.Remove(pidPath); err != nil {
-			return errors.Wrap(err, "Removing likely stale unkillable pid")
-		}
-		return errors.Wrap(err, fmt.Sprintf("Kill(%d/%s)", pid, entry.Executable()))
+		return errors.Wrapf(err, "removing likely stale unkillable pid: %d", pid)
 	}
+
 	return nil
 }
+
+// doesPIDBelongToMinikube tries to find the process with that PID
+// and checks if the executable name contains the string "minikube"
+var isMinikubeProcess = func(pid int) (bool, error) {
+	entry, err := ps.FindProcess(pid)
+	if err != nil {
+		return false, errors.Wrapf(err, "ps.FindProcess for %d", pid)
+	}
+	if entry == nil {
+		klog.Infof("Process not found. pid %d", pid)
+		return false, nil
+	}
+
+	klog.Infof("Found process %d", pid)
+	if !strings.Contains(entry.Executable(), "minikube") {
+		klog.Infof("process %d was not started by minikube", pid)
+		return false, nil
+	}
+
+	return true, nil
+}
+
+// getPids opens the file at PATH and tries to read
+// one or more space separated pids
+func getPids(path string) ([]int, error) {
+	out, err := os.ReadFile(path)
+	if err != nil {
+		return nil, errors.Wrap(err, "ReadFile")
+	}
+	klog.Infof("pidfile contents: %s", out)
+
+	pids := []int{}
+	strPids := strings.Fields(string(out))
+	for _, p := range strPids {
+		intPid, err := strconv.Atoi(p)
+		if err != nil {
+			return nil, err
+		}
+
+		pids = append(pids, intPid)
+	}
+
+	return pids, nil
+}
diff --git a/cmd/minikube/cmd/mount.go b/cmd/minikube/cmd/mount.go
index fc9fdc120..dde841f25 100644
--- a/cmd/minikube/cmd/mount.go
+++ b/cmd/minikube/cmd/mount.go
@@ -21,6 +21,7 @@ import (
 	"net"
 	"os"
 	"os/signal"
+	"path/filepath"
 	"runtime"
 	"strconv"
 	"strings"
@@ -35,11 +36,13 @@ import (
 	"k8s.io/minikube/pkg/minikube/detect"
 	"k8s.io/minikube/pkg/minikube/driver"
 	"k8s.io/minikube/pkg/minikube/exit"
+	"k8s.io/minikube/pkg/minikube/localpath"
 	"k8s.io/minikube/pkg/minikube/mustload"
 	"k8s.io/minikube/pkg/minikube/out"
 	"k8s.io/minikube/pkg/minikube/reason"
 	"k8s.io/minikube/pkg/minikube/style"
 	pkgnetwork "k8s.io/minikube/pkg/network"
+	"k8s.io/minikube/pkg/util/lock"
 	"k8s.io/minikube/third_party/go9p/ufs"
 )
 
@@ -202,15 +205,18 @@ var mountCmd = &cobra.Command{
 		out.Infof("Bind Address: {{.Address}}", out.V{"Address": net.JoinHostPort(bindIP, fmt.Sprint(port))})
 
 		var wg sync.WaitGroup
+		pidchan := make(chan int)
 		if cfg.Type == nineP {
 			wg.Add(1)
-			go func() {
+			go func(pid chan int) {
+				pid <- os.Getpid()
 				out.Styled(style.Fileserver, "Userspace file server: ")
 				ufs.StartServer(net.JoinHostPort(bindIP, strconv.Itoa(port)), debugVal, hostPath)
 				out.Step(style.Stopped, "Userspace file server is shutdown")
 				wg.Done()
-			}()
+			}(pidchan)
 		}
+		pid := <-pidchan
 
 		// Unmount if Ctrl-C or kill request is received.
 		c := make(chan os.Signal, 1)
@@ -222,11 +228,17 @@ var mountCmd = &cobra.Command{
 				if err != nil {
 					out.FailureT("Failed unmount: {{.error}}", out.V{"error": err})
 				}
+
+				err = removePidFromFile(pid)
+				if err != nil {
+					out.FailureT("Failed removing pid from pidfile: {{.error}}", out.V{"error": err})
+				}
+
 				exit.Message(reason.Interrupted, "Received {{.name}} signal", out.V{"name": sig})
 			}
 		}()
 
-		err = cluster.Mount(co.CP.Runner, ip.String(), vmPath, cfg)
+		err = cluster.Mount(co.CP.Runner, ip.String(), vmPath, cfg, pid)
 		if err != nil {
 			if rtErr, ok := err.(*cluster.MountError); ok && rtErr.ErrorType == cluster.MountErrorConnect {
 				exit.Error(reason.GuestMountCouldNotConnect, "mount could not connect", rtErr)
@@ -266,3 +278,56 @@ func getPort() (int, error) {
 	defer l.Close()
 	return l.Addr().(*net.TCPAddr).Port, nil
 }
+
+// removePidFromFile looks at the default locations for the mount-pids file,
+// for the profile in use. If a file is found and its content shows PID, PID gets removed.
+func removePidFromFile(pid int) error {
+	profile := ClusterFlagValue()
+	paths := []string{
+		localpath.MiniPath(), // legacy mount-process path for backwards compatibility
+		localpath.Profile(profile),
+	}
+
+	for _, path := range paths {
+		err := removePid(path, strconv.Itoa(pid))
+		if err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+// removePid reads the file at PATH and tries to remove PID from it if found
+func removePid(path string, pid string) error {
+	// is it the file we're looking for?
+	pidPath := filepath.Join(path, constants.MountProcessFileName)
+	if _, err := os.Stat(pidPath); os.IsNotExist(err) {
+		return nil
+	}
+
+	// we found the correct file
+	// we're reading the pids...
+	out, err := os.ReadFile(pidPath)
+	if err != nil {
+		return errors.Wrap(err, "readFile")
+	}
+
+	pids := []string{}
+	// we're splitting the mount-pids file content into a slice of strings
+	// so that we can compare each to the PID we're looking for
+	strPids := strings.Fields(string(out))
+	for _, p := range strPids {
+		// If we find the PID, we don't add it to the slice
+		if p == pid {
+			continue
+		}
+
+		// if p doesn't correspond to PID, we add to a list
+		pids = append(pids, p)
+	}
+
+	// we write the slice that we obtained back to the mount-pids file
+	newPids := strings.Join(pids, " ")
+	return lock.WriteFile(pidPath, []byte(newPids), 0o644)
+}
diff --git a/pkg/minikube/cluster/mount.go b/pkg/minikube/cluster/mount.go
index 9e8163c58..147729905 100644
--- a/pkg/minikube/cluster/mount.go
+++ b/pkg/minikube/cluster/mount.go
@@ -19,13 +19,20 @@ package cluster
 import (
 	"fmt"
 	"os/exec"
+	"path/filepath"
 	"sort"
 	"strconv"
 	"strings"
 
 	"github.com/pkg/errors"
+	"github.com/spf13/viper"
 	"k8s.io/klog/v2"
 	"k8s.io/minikube/pkg/minikube/command"
+	"k8s.io/minikube/pkg/minikube/constants"
+	"k8s.io/minikube/pkg/minikube/exit"
+	"k8s.io/minikube/pkg/minikube/localpath"
+	"k8s.io/minikube/pkg/minikube/reason"
+	"k8s.io/minikube/pkg/util/lock"
 )
 
 // MountConfig defines the options available to the Mount command
@@ -73,7 +80,7 @@ func (m *MountError) Error() string {
 }
 
 // Mount runs the mount command from the 9p client on the VM to the 9p server on the host
-func Mount(r mountRunner, source string, target string, c *MountConfig) error {
+func Mount(r mountRunner, source string, target string, c *MountConfig, pid int) error {
 	if err := Unmount(r, target); err != nil {
 		return &MountError{ErrorType: MountErrorUnknown, UnderlyingError: errors.Wrap(err, "umount")}
 	}
@@ -90,6 +97,11 @@ func Mount(r mountRunner, source string, target string, c *MountConfig) error {
 		return &MountError{ErrorType: MountErrorUnknown, UnderlyingError: errors.Wrapf(err, "mount with cmd %s ", rr.Command())}
 	}
 
+	profile := viper.GetString("profile")
+	if err := lock.AppendToFile(filepath.Join(localpath.Profile(profile), constants.MountProcessFileName), []byte(fmt.Sprintf(" %s", strconv.Itoa(pid))), 0o644); err != nil {
+		exit.Error(reason.HostMountPid, "Error writing mount pid", err)
+	}
+
 	klog.Infof("mount successful: %q", rr.Output())
 	return nil
 }
diff --git a/pkg/minikube/node/config.go b/pkg/minikube/node/config.go
index b2f51740f..f58839aa5 100644
--- a/pkg/minikube/node/config.go
+++ b/pkg/minikube/node/config.go
@@ -89,7 +89,7 @@ func configureMounts(wg *sync.WaitGroup, cc config.ClusterConfig) {
 	if err := mountCmd.Start(); err != nil {
 		exit.Error(reason.GuestMount, "Error starting mount", err)
 	}
-	if err := lock.WriteFile(filepath.Join(localpath.Profile(profile), constants.MountProcessFileName), []byte(strconv.Itoa(mountCmd.Process.Pid)), 0o644); err != nil {
+	if err := lock.AppendToFile(filepath.Join(localpath.Profile(profile), constants.MountProcessFileName), []byte(fmt.Sprintf(" %s", strconv.Itoa(mountCmd.Process.Pid))), 0o644); err != nil {
 		exit.Error(reason.HostMountPid, "Error writing mount pid", err)
 	}
 }
diff --git a/pkg/util/lock/lock.go b/pkg/util/lock/lock.go
index efb8dc01b..54154ff83 100644
--- a/pkg/util/lock/lock.go
+++ b/pkg/util/lock/lock.go
@@ -43,6 +43,27 @@ func WriteFile(filename string, data []byte, perm os.FileMode) error {
 	return os.WriteFile(filename, data, perm)
 }
 
+// AppendToFile appends DATA bytes to the specified FILENAME in a mutually exclusive way.
+// The file is created if it does not exist, using the specified PERM (before umask)
+func AppendToFile(filename string, data []byte, perm os.FileMode) error {
+	spec := PathMutexSpec(filename)
+	klog.Infof("WriteFile acquiring %s: %+v", filename, spec)
+	releaser, err := mutex.Acquire(spec)
+	if err != nil {
+		return errors.Wrapf(err, "failed to acquire lock for %s: %+v", filename, spec)
+	}
+
+	defer releaser.Release()
+
+	fd, err := os.OpenFile(filename, os.O_APPEND|os.O_CREATE|os.O_WRONLY, perm)
+	if err != nil {
+		return errors.Wrapf(err, "failed to open %s: %+v", filename, spec)
+	}
+
+	_, err = fd.Write(data)
+	return err
+}
+
 // PathMutexSpec returns a mutex spec for a path
 func PathMutexSpec(path string) mutex.Spec {
 	s := mutex.Spec{
diff --git a/translations/de.json b/translations/de.json
index 12ea4e025..9ed7e20a7 100644
--- a/translations/de.json
+++ b/translations/de.json
@@ -249,6 +249,7 @@
 	"Exposed port of the proxyfied dashboard. Set to 0 to pick a random port.": "Port, der für das über den Proxy erreichbare Dashboard freigegeben wird. Wenn man 0 angibt, wird ein zufälliger Port ausgewählt.",
 	"External Adapter on which external switch will be created if no external switch is found. (hyperv driver only)": "Externer Adapter, auf dem der externe Switch erzeugt wird, wenn kein externer Switch gefunden wurde. (nur hyperv Treiber)",
 	"Fail check if container paused": "Schlägt fehl, wenn der Container pausiert ist",
+	"Failed removing pid from pidfile: {{.error}}": "",
 	"Failed runtime": "Runtime fehlgeschlagen",
 	"Failed to build image": "Bau des Images fehlgeschlagen",
 	"Failed to cache and load images": "Cachen und laden der Images fehlgeschlagen",
@@ -431,6 +432,7 @@
 	"Mounts the specified directory into minikube": "Mounted das angegebene Verzeichnis in Minikube",
 	"Mounts the specified directory into minikube.": "Mounted das angegebene Verzeichnis in Minikube.",
 	"Multiple errors deleting profiles": "Es sind mehrere Fehler beim Löschen der Profile aufgetreten",
+	"Multiple errors encountered:": "",
 	"Multiple minikube profiles were found - ": "Es wurden mehrere Minikube Profile gefunden - ",
 	"NIC Type used for host only network. One of Am79C970A, Am79C973, 82540EM, 82543GC, 82545EM, or virtio (virtualbox driver only)": "NIC Type der fürs Host only Netzwerk verwendet wird. Einer aus Am79C970A, Am79C973, 82540EM, 82543GC, 82545EM, oder virtio (nur virtualbox Treiber)",
 	"NIC Type used for nat network. One of Am79C970A, Am79C973, 82540EM, 82543GC, 82545EM, or virtio (virtualbox driver only)": "NIC Type der fürs NAT Network verwendet wird. Einer aus Am79C970A, Am79C973, 82540EM, 82543GC, 82545EM, or virtio (Nur virtualbox Treiber)",
diff --git a/translations/es.json b/translations/es.json
index 97c950087..3673d2bbd 100644
--- a/translations/es.json
+++ b/translations/es.json
@@ -258,6 +258,7 @@
 	"Exposed port of the proxyfied dashboard. Set to 0 to pick a random port.": "",
 	"External Adapter on which external switch will be created if no external switch is found. (hyperv driver only)": "",
 	"Fail check if container paused": "",
+	"Failed removing pid from pidfile: {{.error}}": "",
 	"Failed runtime": "",
 	"Failed to build image": "No se pudo construir la imagen",
 	"Failed to cache and load images": "",
@@ -439,6 +440,7 @@
 	"Mounts the specified directory into minikube": "",
 	"Mounts the specified directory into minikube.": "",
 	"Multiple errors deleting profiles": "",
+	"Multiple errors encountered:": "",
 	"Multiple minikube profiles were found - ": "",
 	"NIC Type used for host only network. One of Am79C970A, Am79C973, 82540EM, 82543GC, 82545EM, or virtio (virtualbox driver only)": "",
 	"NIC Type used for nat network. One of Am79C970A, Am79C973, 82540EM, 82543GC, 82545EM, or virtio (virtualbox driver only)": "",
diff --git a/translations/fr.json b/translations/fr.json
index af3d6a585..b3f7635a5 100644
--- a/translations/fr.json
+++ b/translations/fr.json
@@ -245,6 +245,7 @@
 	"Exposed port of the proxyfied dashboard. Set to 0 to pick a random port.": "Port exposé du tableau de bord proxyfié. Réglez sur 0 pour choisir un port aléatoire.",
 	"External Adapter on which external switch will be created if no external switch is found. (hyperv driver only)": "L'adaptateur externe sur lequel un commutateur externe sera créé si aucun commutateur externe n'est trouvé. (pilote hyperv uniquement)",
 	"Fail check if container paused": "Échec de la vérification si le conteneur est en pause",
+	"Failed removing pid from pidfile: {{.error}}": "",
 	"Failed runtime": "Échec de l'exécution",
 	"Failed to build image": "Échec de la création de l'image",
 	"Failed to cache and load images": "Échec de la mise en cache et du chargement des images",
@@ -422,6 +423,7 @@
 	"Mounts the specified directory into minikube": "Monte le répertoire spécifié dans minikube",
 	"Mounts the specified directory into minikube.": "Monte le répertoire spécifié dans minikube.",
 	"Multiple errors deleting profiles": "Plusieurs erreurs lors de la suppression des profils",
+	"Multiple errors encountered:": "",
 	"Multiple minikube profiles were found - ": "Plusieurs profils minikube ont été trouvés -",
 	"NIC Type used for host only network. One of Am79C970A, Am79C973, 82540EM, 82543GC, 82545EM, or virtio (virtualbox driver only)": "Type de carte réseau utilisé pour le réseau hôte uniquement. Am79C970A, Am79C973, 82540EM, 82543GC, 82545EM ou virtio (pilote virtualbox uniquement)",
 	"NIC Type used for nat network. One of Am79C970A, Am79C973, 82540EM, 82543GC, 82545EM, or virtio (virtualbox driver only)": "Type de carte réseau utilisé pour le réseau nat. Am79C970A, Am79C973, 82540EM, 82543GC, 82545EM ou virtio (pilote virtualbox uniquement)",
diff --git a/translations/ja.json b/translations/ja.json
index 52f00c68e..4fa2db612 100644
--- a/translations/ja.json
+++ b/translations/ja.json
@@ -235,6 +235,7 @@
 	"Exposed port of the proxyfied dashboard. Set to 0 to pick a random port.": "プロキシー化されたダッシュボードの公開ポート。0 に設定すると、ランダムなポートが選ばれます。",
 	"External Adapter on which external switch will be created if no external switch is found. (hyperv driver only)": "外部スイッチが見つからない場合に、外部スイッチが作成される外部アダプター (hyperv ドライバーのみ)。",
 	"Fail check if container paused": "コンテナーが一時停止しているかどうかのチェックに失敗しました",
+	"Failed removing pid from pidfile: {{.error}}": "",
 	"Failed runtime": "ランタイムが失敗しました",
 	"Failed to build image": "イメージのビルドに失敗しました",
 	"Failed to cache and load images": "イメージのキャッシュとロードに失敗しました",
@@ -408,6 +409,7 @@
 	"Mounts the specified directory into minikube": "minikube に指定されたディレクトリーをマウントします",
 	"Mounts the specified directory into minikube.": "minikube に指定されたディレクトリーをマウントします。",
 	"Multiple errors deleting profiles": "プロファイル削除中に複数のエラーが発生しました",
+	"Multiple errors encountered:": "",
 	"Multiple minikube profiles were found - ": "複数の minikube プロファイルが見つかりました - ",
 	"NIC Type used for host only network. One of Am79C970A, Am79C973, 82540EM, 82543GC, 82545EM, or virtio (virtualbox driver only)": "ホストオンリーネットワークに使用する NIC タイプ。Am79C970A、Am79C973、82540EM、82543GC、82545EM、virtio のいずれか (virtualbox ドライバーのみ)",
 	"NIC Type used for nat network. One of Am79C970A, Am79C973, 82540EM, 82543GC, 82545EM, or virtio (virtualbox driver only)": "NAT ネットワークに使用する NIC タイプ。Am79C970A、Am79C973、82540EM、82543GC、82545EM、virtio のいずれか (virtualbox ドライバーのみ)",
diff --git a/translations/ko.json b/translations/ko.json
index ec8cca1a2..9064e493d 100644
--- a/translations/ko.json
+++ b/translations/ko.json
@@ -267,6 +267,7 @@
 	"Exposed port of the proxyfied dashboard. Set to 0 to pick a random port.": "",
 	"External Adapter on which external switch will be created if no external switch is found. (hyperv driver only)": "",
 	"Fail check if container paused": "",
+	"Failed removing pid from pidfile: {{.error}}": "",
 	"Failed runtime": "런타임이 실패하였습니다",
 	"Failed to build image": "",
 	"Failed to cache ISO": "ISO 캐싱에 실패하였습니다",
@@ -454,6 +455,7 @@
 	"Mounts the specified directory into minikube": "특정 디렉토리를 minikube 에 마운트합니다",
 	"Mounts the specified directory into minikube.": "",
 	"Multiple errors deleting profiles": "",
+	"Multiple errors encountered:": "",
 	"Multiple minikube profiles were found - ": "",
 	"NIC Type used for host only network. One of Am79C970A, Am79C973, 82540EM, 82543GC, 82545EM, or virtio (virtualbox driver only)": "",
 	"NIC Type used for nat network. One of Am79C970A, Am79C973, 82540EM, 82543GC, 82545EM, or virtio (virtualbox driver only)": "",
diff --git a/translations/pl.json b/translations/pl.json
index c300a992b..494464de6 100644
--- a/translations/pl.json
+++ b/translations/pl.json
@@ -258,6 +258,7 @@
 	"Exposed port of the proxyfied dashboard. Set to 0 to pick a random port.": "",
 	"External Adapter on which external switch will be created if no external switch is found. (hyperv driver only)": "",
 	"Fail check if container paused": "",
+	"Failed removing pid from pidfile: {{.error}}": "",
 	"Failed runtime": "",
 	"Failed to build image": "",
 	"Failed to cache and load images": "",
@@ -443,6 +444,7 @@
 	"Mounts the specified directory into minikube": "Montuje podany katalog wewnątrz minikube",
 	"Mounts the specified directory into minikube.": "Montuje podany katalog wewnątrz minikube",
 	"Multiple errors deleting profiles": "Wystąpiło wiele błędów podczas usuwania profili",
+	"Multiple errors encountered:": "",
 	"Multiple minikube profiles were found - ": "Znaleziono wiele profili minikube - ",
 	"NIC Type used for host only network. One of Am79C970A, Am79C973, 82540EM, 82543GC, 82545EM, or virtio (virtualbox driver only)": "",
 	"NIC Type used for nat network. One of Am79C970A, Am79C973, 82540EM, 82543GC, 82545EM, or virtio (virtualbox driver only)": "",
diff --git a/translations/ru.json b/translations/ru.json
index 095293e49..d8540a316 100644
--- a/translations/ru.json
+++ b/translations/ru.json
@@ -232,6 +232,7 @@
 	"Exposed port of the proxyfied dashboard. Set to 0 to pick a random port.": "",
 	"External Adapter on which external switch will be created if no external switch is found. (hyperv driver only)": "",
 	"Fail check if container paused": "",
+	"Failed removing pid from pidfile: {{.error}}": "",
 	"Failed runtime": "",
 	"Failed to build image": "",
 	"Failed to cache and load images": "",
@@ -404,6 +405,7 @@
 	"Mounts the specified directory into minikube": "",
 	"Mounts the specified directory into minikube.": "",
 	"Multiple errors deleting profiles": "",
+	"Multiple errors encountered:": "",
 	"Multiple minikube profiles were found - ": "",
 	"NIC Type used for host only network. One of Am79C970A, Am79C973, 82540EM, 82543GC, 82545EM, or virtio (virtualbox driver only)": "",
 	"NIC Type used for nat network. One of Am79C970A, Am79C973, 82540EM, 82543GC, 82545EM, or virtio (virtualbox driver only)": "",
diff --git a/translations/strings.txt b/translations/strings.txt
index 953366b39..fa3bed8d7 100644
--- a/translations/strings.txt
+++ b/translations/strings.txt
@@ -232,6 +232,7 @@
 	"Exposed port of the proxyfied dashboard. Set to 0 to pick a random port.": "",
 	"External Adapter on which external switch will be created if no external switch is found. (hyperv driver only)": "",
 	"Fail check if container paused": "",
+	"Failed removing pid from pidfile: {{.error}}": "",
 	"Failed runtime": "",
 	"Failed to build image": "",
 	"Failed to cache and load images": "",
@@ -404,6 +405,7 @@
 	"Mounts the specified directory into minikube": "",
 	"Mounts the specified directory into minikube.": "",
 	"Multiple errors deleting profiles": "",
+	"Multiple errors encountered:": "",
 	"Multiple minikube profiles were found - ": "",
 	"NIC Type used for host only network. One of Am79C970A, Am79C973, 82540EM, 82543GC, 82545EM, or virtio (virtualbox driver only)": "",
 	"NIC Type used for nat network. One of Am79C970A, Am79C973, 82540EM, 82543GC, 82545EM, or virtio (virtualbox driver only)": "",
diff --git a/translations/zh-CN.json b/translations/zh-CN.json
index ed7882591..5eada44e9 100644
--- a/translations/zh-CN.json
+++ b/translations/zh-CN.json
@@ -316,6 +316,7 @@
 	"Exposed port of the proxyfied dashboard. Set to 0 to pick a random port.": "",
 	"External Adapter on which external switch will be created if no external switch is found. (hyperv driver only)": "",
 	"Fail check if container paused": "如果容器已挂起，则检查失败",
+	"Failed removing pid from pidfile: {{.error}}": "",
 	"Failed runtime": "运行时失败",
 	"Failed to build image": "构建镜像失败",
 	"Failed to cache ISO": "缓存ISO 时失败",
@@ -518,6 +519,7 @@
 	"Mounts the specified directory into minikube": "将指定的目录挂载到 minikube",
 	"Mounts the specified directory into minikube.": "将指定的目录挂载到 minikube。",
 	"Multiple errors deleting profiles": "删除配置文件时出现多个错误",
+	"Multiple errors encountered:": "",
 	"Multiple minikube profiles were found -": "发现了多个 minikube 配置文件 -",
 	"Multiple minikube profiles were found - ": "",
 	"NIC Type used for host only network. One of Am79C970A, Am79C973, 82540EM, 82543GC, 82545EM, or virtio (virtualbox driver only)": "网卡类型仅用于主机网络。Am79C970A, Am79C973, 82540EM, 82543GC, 82545EM 之一，或 virtio(仅限 VirtualBox 驱动程序)",


Test patch:
diff --git a/cmd/minikube/cmd/delete_test.go b/cmd/minikube/cmd/delete_test.go
index d91f6d5b3..36adc1cb4 100644
--- a/cmd/minikube/cmd/delete_test.go
+++ b/cmd/minikube/cmd/delete_test.go
@@ -19,7 +19,9 @@ package cmd
 import (
 	"fmt"
 	"os"
+	"os/exec"
 	"path/filepath"
+	"strings"
 	"testing"
 
 	"github.com/docker/machine/libmachine"
@@ -220,3 +222,64 @@ func TestDeleteAllProfiles(t *testing.T) {
 
 	viper.Set(config.ProfileName, "")
 }
+
+// TestTryKillOne spawns a go child process that waits to be SIGKILLed,
+// then tries to execute the tryKillOne function on it;
+// if after tryKillOne the process still exists, we consider it a failure
+func TestTryKillOne(t *testing.T) {
+
+	var waitForSig = []byte(`
+package main
+
+import (
+	"os"
+	"os/signal"
+	"syscall"
+)
+
+// This is used to unit test functions that send termination
+// signals to processes, in a cross-platform way.
+func main() {
+	ch := make(chan os.Signal, 1)
+	done := make(chan struct{})
+	defer close(ch)
+
+	signal.Notify(ch, syscall.SIGHUP)
+	defer signal.Stop(ch)
+
+	go func() {
+		<-ch
+		close(done)
+	}()
+
+	<-done
+}
+`)
+	td := t.TempDir()
+	tmpfile := filepath.Join(td, "waitForSig.go")
+
+	if err := os.WriteFile(tmpfile, waitForSig, 0o600); err != nil {
+		t.Fatalf("copying source to %s: %v\n", tmpfile, err)
+	}
+
+	processToKill := exec.Command("go", "run", tmpfile)
+	err := processToKill.Start()
+	if err != nil {
+		t.Fatalf("while execing child process: %v\n", err)
+	}
+	pid := processToKill.Process.Pid
+
+	isMinikubeProcess = func(int) (bool, error) {
+		return true, nil
+	}
+
+	err = trySigKillProcess(pid)
+	if err != nil {
+		t.Fatalf("while trying to kill child proc %d: %v\n", pid, err)
+	}
+
+	// waiting for process to exit
+	if err := processToKill.Wait(); !strings.Contains(err.Error(), "killed") {
+		t.Fatalf("unable to kill process: %v\n", err)
+	}
+}
diff --git a/site/content/en/docs/contrib/tests.en.md b/site/content/en/docs/contrib/tests.en.md
index 2c17563f3..1d3ff3407 100644
--- a/site/content/en/docs/contrib/tests.en.md
+++ b/site/content/en/docs/contrib/tests.en.md
@@ -399,6 +399,10 @@ Note: This test will fail on release PRs as the licenses file for the new versio
 
 #### validateMountCmd
 verifies the minikube mount command works properly
+for the platforms that support it, we're testing:
+- a generic 9p mount
+- a 9p mount on a specific port
+- cleaning-mechanism for profile-specific mounts
 
 #### validatePersistentVolumeClaim
 makes sure PVCs work properly
diff --git a/test/integration/functional_test_mount_test.go b/test/integration/functional_test_mount_test.go
index b09491d42..a04e2a800 100644
--- a/test/integration/functional_test_mount_test.go
+++ b/test/integration/functional_test_mount_test.go
@@ -45,6 +45,10 @@ const (
 )
 
 // validateMountCmd verifies the minikube mount command works properly
+// for the platforms that support it, we're testing:
+// - a generic 9p mount
+// - a 9p mount on a specific port
+// - cleaning-mechanism for profile-specific mounts
 func validateMountCmd(ctx context.Context, t *testing.T, profile string) { // nolint
 	if NoneDriver() {
 		t.Skip("skipping: none driver does not support mount")
@@ -116,7 +120,7 @@ func validateMountCmd(ctx context.Context, t *testing.T, profile string) { // no
 		if err := retry.Expo(checkMount, time.Millisecond*500, Seconds(15)); err != nil {
 			// For local testing, allow macOS users to click prompt. If they don't, skip the test.
 			if runtime.GOOS == "darwin" {
-				t.Skip("skipping: mount did not appear, likely because macOS requires prompt to allow non-codesigned binaries to listen on non-localhost port")
+				t.Skip("skipping: mount did not appear, likely because macOS requires prompt to allow non-code signed binaries to listen on non-localhost port")
 			}
 			t.Fatalf("/mount-9p did not appear within %s: %v", time.Since(start), err)
 		}
@@ -244,7 +248,7 @@ func validateMountCmd(ctx context.Context, t *testing.T, profile string) { // no
 		if err := retry.Expo(checkMount, time.Millisecond*500, Seconds(15)); err != nil {
 			// For local testing, allow macOS users to click prompt. If they don't, skip the test.
 			if runtime.GOOS == "darwin" {
-				t.Skip("skipping: mount did not appear, likely because macOS requires prompt to allow non-codesigned binaries to listen on non-localhost port")
+				t.Skip("skipping: mount did not appear, likely because macOS requires prompt to allow non-code signed binaries to listen on non-localhost port")
 			}
 			t.Fatalf("/mount-9p did not appear within %s: %v", time.Since(start), err)
 		}
@@ -280,4 +284,95 @@ func validateMountCmd(ctx context.Context, t *testing.T, profile string) { // no
 			t.Fatalf("failed to find bind address with port 46464. Mount command out: \n%v", mountText)
 		}
 	})
+
+	t.Run("VerifyCleanup", func(t *testing.T) {
+		tempDir := t.TempDir()
+
+		ctx, cancel := context.WithTimeout(ctx, Minutes(10))
+
+		guestMountPaths := []string{"/mount1", "/mount2", "/mount3"}
+
+		var mntProcs []*StartSession
+		for _, guestMount := range guestMountPaths {
+			args := []string{"mount", "-p", profile, fmt.Sprintf("%s:%s", tempDir, guestMount), "--alsologtostderr", "-v=1"}
+			mntProc, err := Start(t, exec.CommandContext(ctx, Target(), args...))
+			if err != nil {
+				t.Fatalf("%v failed: %v", args, err)
+			}
+
+			mntProcs = append(mntProcs, mntProc)
+
+		}
+
+		defer func() {
+			// Still trying to stop mount processes that could otherwise
+			// (if something weird happens...) leave the test run hanging
+			// The worst thing that could happen is that we try to kill
+			// something that was aleardy killed...
+			for _, mp := range mntProcs {
+				mp.Stop(t)
+			}
+
+			cancel()
+			if *cleanup {
+				os.RemoveAll(tempDir)
+			}
+		}()
+
+		// are the mounts alive yet..?
+		checkMount := func() error {
+			for _, mnt := range guestMountPaths {
+				rr, err := Run(t, exec.CommandContext(ctx, Target(), "-p", profile, "ssh", "findmnt -T", mnt))
+				if err != nil {
+					// if something weird has happened from previous tests..
+					// this could at least spare us some waiting
+					if strings.Contains(rr.Stdout.String(), fmt.Sprintf("Profile \"%s\" not found.", profile)) {
+						t.Fatalf("profile was deleted, cancelling the test")
+					}
+					return err
+				}
+			}
+			return nil
+		}
+		if err := retry.Expo(checkMount, time.Millisecond*500, Seconds(15)); err != nil {
+			// For local testing, allow macOS users to click prompt. If they don't, skip the test.
+			if runtime.GOOS == "darwin" {
+				t.Skip("skipping: mount did not appear, likely because macOS requires prompt to allow non-code signed binaries to listen on non-localhost port")
+			}
+			t.Fatalf("mount was not ready in time: %v", err)
+		}
+
+		checkProcsAlive := func(end chan bool) {
+			for _, mntp := range mntProcs {
+				// Trying to wait for process end
+				// if the wait fail with ExitError we know that the process
+				// doesn't exist anymore..
+				go func(end chan bool) {
+					err := mntp.cmd.Wait()
+					if _, ok := err.(*exec.ExitError); ok {
+						end <- true
+					}
+				}(end)
+
+				// Either we know that the mount process has ended
+				// or we fail after 1 second
+				// TODO: is there a better way? rather than waiting..
+				select {
+				case <-time.After(1 * time.Second):
+					t.Fatalf("1s TIMEOUT: Process %d is still running\n", mntp.cmd.Process.Pid)
+				case <-end:
+					continue
+				}
+			}
+		}
+
+		// exec the mount killer
+		_, err := Run(t, exec.Command(Target(), "mount", "-p", profile, "--kill=true"))
+		if err != nil {
+			t.Fatalf("failed while trying to kill mounts")
+		}
+
+		end := make(chan bool, 1)
+		checkProcsAlive(end)
+	})
 }