kubernetes/kops · error

error reading /proc/self/mountinfo: %v

Error message

error reading /proc/self/mountinfo: %v

What it means

BindMount.Find determines whether the mount already exists by parsing /proc/self/mountinfo. If the file cannot be read, the error is wrapped with this message. This indicates a /proc issue rather than a mount-state mismatch.

Source

Thrown at upup/pkg/fi/nodeup/nodetasks/bindmount.go:98

		}
	}

	return deps
}

func findTaskInSlice(tasks []fi.NodeupTask, task fi.NodeupTask) int {
	for i, t := range tasks {
		if t == task {
			return i
		}
	}
	return -1
}

func (e *BindMount) Find(c *fi.NodeupContext) (*BindMount, error) {
	mounts, err := os.ReadFile("/proc/self/mountinfo")
	if err != nil {
		return nil, fmt.Errorf("error reading /proc/self/mountinfo: %v", err)
	}
	for _, line := range strings.Split(string(mounts), "\n") {
		// See `man mount_namespaces` and `man proc`
		// 534 458 8:1 /var/lib/kubelet /home/kubernetes/containerized_mounter/rootfs/var/lib/kubelet rw,nosuid,nodev,noexec,relatime shared:19 - ext4 /dev/sda1 rw,commit=30,data=ordered
		line = strings.TrimSpace(line)
		if line == "" {
			continue
		}
		tokens := strings.Fields(line)
		if len(tokens) < 8 {
			klog.V(4).Infof("ignoring mountinfo line: %q", line)
		}

		mountpoint := tokens[4]
		if strings.TrimSuffix(mountpoint, "/") != strings.TrimSuffix(e.Mountpoint, "/") {
			continue
		}

View on GitHub (pinned to 4c8573c808)

Solutions

1. Ensure /proc is mounted in the environment (`mount -t proc proc /proc`)
2. Run nodeup on the host (systemd unit) rather than inside a restricted container
3. Check security profiles (seccomp/AppArmor/SELinux) that may deny reads on /proc/self/mountinfo
4. Reboot/re-provision the node if procfs appears corrupted

if _, err := os.Stat("/proc/self/mountinfo"); err != nil {
  return errors.New("procfs unavailable; run nodeup on the host with /proc mounted")
}

if err := nodeup.Run(ctx); err != nil {
  if strings.Contains(err.Error(), "/proc/self/mountinfo") {
    klog.Errorf("procfs inaccessible — check container/seccomp profile: %v", err)
  }
}

When it happens

Trigger: os.ReadFile("/proc/self/mountinfo") fails — /proc not mounted (minimal containers), procfs hidden by seccomp/AppArmor, or host filesystem corruption.

Common situations: Running nodeup inside a container without /proc mounted; hardened runtimes blocking procfs reads; chrooted environments lacking procfs.

Related errors

• failed to ensure the directory: %s, error: %w
• error creating temp dir: %v
• error writing temp file: %v
• error reading addons file %s: %v
• reading %q certificate: %v

AI-assisted analysis of kubernetes/kops@4c8573c808 (2026-09-05). Data as JSON: /api/errors/4fc2668f4113f017. Report an issue: GitHub.