utils: ignore unified on cgroupv1 if not present
@@ -150,6 +150,11 @@ func moveUnderCgroup(cgroup, subtree string, processes []uint32) error {
// If it is not using unified mode, the cgroup v2 hierarchy is
// usually mounted under /sys/fs/cgroup/unified
cgroupRoot = filepath.Join(cgroupRoot, "unified")
+
+ // Ignore the unified mount if it doesn't exist
+ if _, err := os.Stat(cgroupRoot); err != nil && os.IsNotExist(err) {
+ continue
+ }
} else if parts[1] != "" {
// Assume the controller is mounted at /sys/fs/cgroup/$CONTROLLER.
controller := strings.TrimPrefix(parts[1], "name=")
