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Vagrant Fatal Error: Runtime BSDThread_Register Error

Vagrant Fatal Error: Runtime BSDThread_Register Error

If you’ve ever encountered the dreaded “Vagrant fatal error: runtime BSDThread_Register error,” you’re not alone. This perplexing error message can be frustrating and confusing, especially if you’re new to Vagrant and virtualization. But fear not! In this article, we’ll unravel the mystery behind this error, explain its meaning, and provide solutions to help you overcome it.

Vagrant Fatal Error: Runtime BSDThread_Register Error

Here are some additional details about the error:

  • The error message “fatal error: runtime: bsdthread_register error” is caused by a conflict between Vagrant and VirtualBox. Vagrant uses a feature called “threads” to run multiple tasks simultaneously. VirtualBox also uses threads, but it uses a different implementation than Vagrant. This conflict can cause Vagrant to fail to start.
  • To fix this error, you must update VirtualBox to the latest version. The latest version of VirtualBox uses a newer implementation of threads compatible with Vagrant. You can update VirtualBox by opening a terminal and running the following command: brew upgrade virtualbox.

Once you have updated VirtualBox, you can start Vagrant without any problems.

Understanding Vagrant and Virtualization

Before we dive into the specifics of the BSDThread_Register error, let’s take a step back and briefly discuss Vagrant and virtualization. Vagrant is an open-source tool designed to create and manage portable development environments.

It allows developers to set up reproducible and consistent development environments regardless of the underlying host operating system.

On the other hand, virtualization is the process of emulating a physical computer within another computer, enabling multiple operating systems to run simultaneously on a single machine.

Vagrant leverages virtualization technologies like VirtualBox or VMware to create these isolated development environments.

The BSDThread_Register Error

So, what exactly is the BSDThread_Register error? This error typically occurs when Vagrant tries to communicate with the underlying virtualization software but encounters a problem. The error message might look something like this:


Vagrant fatal error: runtime BSDThread_Register error

While this error message may seem cryptic, it clarifies the underlying issue. BSDThread_Register is a function used by the macOS kernel, and encountering an error during its runtime suggests a problem with the interaction between Vagrant and the macOS operating system.

Common Causes of the BSDThread_Register Error

Now that we know what the error signifies, let’s explore some of its common causes. Understanding the root cause can help us identify potential solutions. Here are a few possible reasons for encountering the BSDThread_Register error:

  • Outdated Virtualization Software: Using an outdated version of the virtualization software, such as VirtualBox or VMware, can lead to compatibility issues with Vagrant and macOS.
  • Unsupported macOS Version: The virtualization software might not fully support certain versions, causing conflicts when running Vagrant.
  • Inadequate System Resources: Running resource-intensive applications alongside Vagrant can strain your system’s resources, potentially leading to errors.

Resolving the BSDThread_Register Error

Now that we’ve uncovered the potential causes, let’s explore some strategies to resolve the BSDThread_Register error and get back to smooth Vagrant usage.

1. Update Virtualization Software

The first step is to ensure you use your virtualization software’s latest version. Visit the official website of the virtualization software you use, such as VirtualBox or VMware, and download the newest version available.

Upgrading your virtualization software can often resolve compatibility issues with Vagrant and macOS.

2. Upgrade macOS

If you’re running an outdated macOS version, consider upgrading to a newer version. Apple regularly releases updates to address bugs and improve compatibility with various software. Before upgrading, back up your important data and follow the recommended upgrade process for your specific macOS version.

3. Adjust System Resources

If you’re running resource-intensive applications alongside Vagrant, your system may struggle to allocate enough resources to run both smoothly. Try closing unnecessary applications and reducing the load on your system.

Additionally, you can adjust the settings of your virtual machine to allocate more memory or CPU cores, if available.

4. Check Vagrant Plugin Compatibility

Vagrant offers a wide range of plugins that enhance its functionality. However, certain plugins might not be fully compatible with the version of Vagrant or the virtualization software you’re using.

Check the documentation of the plugins you have installed and ensure they are compatible with your setup. Consider updating or removing any plugins that could cause conflicts.

5. Reinstall Vagrant and Plugins

If all else fails, you might consider reinstalling Vagrant and its associated plugins. Uninstall Vagrant completely from your system, and then download and install the latest version from the official Vagrant website.

This fresh installation can often resolve any underlying configuration or compatibility issues causing the BSDThread_Register error.


Encountering the Vagrant fatal error: runtime BSDThread_Register error can be a frustrating roadblock in your development workflow. However, armed with the knowledge of its causes and potential solutions, you can tackle this error head-on. Remember to update your virtualization software, ensure macOS compatibility, manage system resources, check plugin compatibility, and consider reinstalling Vagrant if needed. With these steps, you’ll be well-equipped to overcome the BSDThread_Register error and continue using Vagrant smoothly in your development environment.


Q: What does the “Vagrant fatal error: runtime BSDThread_Register error” mean?

A: This error occurs when Vagrant encounters a problem communicating with the underlying virtualization software on macOS.

Q: Why am I seeing this error?

A: There are several potential causes for this error, including outdated virtualization software, unsupported macOS versions, or inadequate system resources.

Q: How can I fix the BSDThread_Register error?

A: Here are some possible solutions: update your virtualization software, upgrade macOS, adjust system resources, check plugin compatibility, or reinstall Vagrant.

Q: Is the BSDThread_Register error specific to Vagrant on macOS?

A: This error is typically encountered when using Vagrant on macOS due to the interaction between Vagrant and the macOS kernel.

Q: Can I still use Vagrant if I encounter this error?

A: While encountering this error can be frustrating, it is possible to resolve it and continue using Vagrant for your development environments.

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