vendor: update google/cadvisor and opencontainers/runc

Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>

vendor/github.com/opencontainers/runc/libcontainer/cgroups/fs2/defaultpath.go

@@ -44,14 +44,10 @@ func defaultDirPath(c *configs.Cgroup) (string, error) {
 	cgParent := libcontainerUtils.CleanPath(c.Parent)
 	cgName := libcontainerUtils.CleanPath(c.Name)
 
-	ownCgroup, err := parseCgroupFile("/proc/self/cgroup")
-	if err != nil {
-		return "", err
-	}
-	return _defaultDirPath(UnifiedMountpoint, cgPath, cgParent, cgName, ownCgroup)
+	return _defaultDirPath(UnifiedMountpoint, cgPath, cgParent, cgName)
 }
 
-func _defaultDirPath(root, cgPath, cgParent, cgName, ownCgroup string) (string, error) {
+func _defaultDirPath(root, cgPath, cgParent, cgName string) (string, error) {
 	if (cgName != "" || cgParent != "") && cgPath != "" {
 		return "", errors.New("cgroup: either Path or Name and Parent should be used")
 	}
@@ -62,6 +58,16 @@ func _defaultDirPath(root, cgPath, cgParent, cgName, ownCgroup string) (string,
 	if filepath.IsAbs(innerPath) {
 		return filepath.Join(root, innerPath), nil
 	}
+
+	ownCgroup, err := parseCgroupFile("/proc/self/cgroup")
+	if err != nil {
+		return "", err
+	}
+	// The current user scope most probably has tasks in it already,
+	// making it impossible to enable controllers for its sub-cgroup.
+	// A parent cgroup (with no tasks in it) is what we need.
+	ownCgroup = filepath.Dir(ownCgroup)
+
 	return filepath.Join(root, ownCgroup, innerPath), nil
 }
 
@@ -80,9 +86,6 @@ func parseCgroupFromReader(r io.Reader) (string, error) {
 		s = bufio.NewScanner(r)
 	)
 	for s.Scan() {
-		if err := s.Err(); err != nil {
-			return "", err
-		}
 		var (
 			text  = s.Text()
 			parts = strings.SplitN(text, ":", 3)
@@ -95,5 +98,8 @@ func parseCgroupFromReader(r io.Reader) (string, error) {
 			return parts[2], nil
 		}
 	}
+	if err := s.Err(); err != nil {
+		return "", err
+	}
 	return "", errors.New("cgroup path not found")
 }