add D status check for container when killing it

Signed-off-by: ningmingxiao <[email protected]>

Author: ningmingxiao

daemon/container_operations_unix.go

@@ -351,16 +351,26 @@ func killProcessDirectly(container *container.Container) error {
 		return err
 	}
 
-	// In case there were some exceptions(e.g., state of zombie and D)
 	if process.Alive(pid) {
-		// Since we can not kill a zombie pid, add zombie check here
-		isZombie, err := process.Zombie(pid)
+		status, err := process.Status(pid)
 		if err != nil {
 			logrus.WithError(err).WithField("container", container.ID).Warn("Container state is invalid")
 			return err
 		}
-		if isZombie {
+		// Since we can not kill a zombie and D status pid, add check here
+		switch status {
+		case "D":
+			return errdefs.System(errors.Errorf("container %s PID %d is uninterruptible and can not be killed", stringid.TruncateID(container.ID), pid))
+		case "Z":
 			return errdefs.System(errors.Errorf("container %s PID %d is zombie and can not be killed. Use the --init option when creating containers to run an init inside the container that forwards signals and reaps processes", stringid.TruncateID(container.ID), pid))
+		case "S":
+			return errdefs.System(errors.Errorf("container %s PID %d is %s and can not be killed", stringid.TruncateID(container.ID), pid, status))
+		case "T", "X", "x":
+		case "":
+			return errdefs.System(errors.Errorf("container %s PID %d status is nil", stringid.TruncateID(container.ID), pid))
+		default:
+			// If process can't be killed and status is not D or Z print some warning log.It is almost impossible to happen.
+			logrus.Warnf("container %s PID %d status is \"%s\"", container.ID, pid, status)
 		}
 	}
 	return nil

pkg/process/process_unix.go

@@ -64,18 +64,29 @@ func Kill(pid int) error {
 //
 // [PROC(5)]: https://man7.org/linux/man-pages/man5/proc.5.html
 func Zombie(pid int) (bool, error) {
+	status, err := Status(pid)
+	return status == "Z", err
+}
+
+// Status returns the status of the given process. It only considers positive
+// PIDs; 0 (all processes in the current process group), -1 (all processes with
+// a PID larger than 1), and negative (-n, all processes in process group "n")
+// values for pid are ignored. Refer to [PROC(5)] for details.
+//
+// [PROC(5)]: https://man7.org/linux/man-pages/man5/proc.5.html
+func Status(pid int) (string, error) {
 	if pid < 1 {
-		return false, nil
+		return "", nil
 	}
 	data, err := os.ReadFile(fmt.Sprintf("/proc/%d/stat", pid))
 	if err != nil {
 		if os.IsNotExist(err) {
-			return false, nil
+			return "", nil
 		}
-		return false, err
+		return "", err
 	}
-	if cols := bytes.SplitN(data, []byte(" "), 4); len(cols) >= 3 && string(cols[2]) == "Z" {
-		return true, nil
+	if cols := bytes.SplitN(data, []byte(" "), 4); len(cols) >= 3 {
+		return string(cols[2]), nil
 	}
-	return false, nil
+	return "", nil
 }