Software⏱️ 2 min read📅 2026-05-30

How to Fix: Lighthouse CI failing when running 2nd test due to Eperm issues

Lighthouse CI Permission Denied Error

Quick Answer: Try running Lighthouse with elevated privileges or using a different temporary directory to resolve the EPERM error.

📋 Table of Contents

  1. 💡 Why You Are Getting This Error
  2. ✅ Best Solutions to Fix It
  3. ✨ Wrapping Up

Lighthouse CI failing when running 2nd test due to Eperm issues

💡 Why You Are Getting This Error

  • Causes of this issue include:
    1. Running multiple tests in a row without sufficient clearance between them, leading to file descriptor exhaustion.

✅ Best Solutions to Fix It

Method 1: Running Lighthouse in a Separate Process

  1. Step 1: Run the lighthouse command with the --no-wait option to prevent file descriptor exhaustion.

Method 2: Increasing the Maximum Number of Open Files

  1. Step 1: Edit your system's configuration file to increase the maximum number of open files.

✨ Wrapping Up

To resolve this issue, try running Lighthouse in a separate process or increasing the maximum number of open files on your system. By doing so, you should be able to run multiple tests without encountering EPERM errors.

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