hashicorp/vagrant · error · Vagrant::Errors::MachineLocked

Vagrant can't use the requested machine because it is locked

Error message

Vagrant can't use the requested machine because it is locked! This
means that another Vagrant process is currently reading or modifying
the machine. Please wait for that Vagrant process to end and try
again. Details about the machine are shown below:

Name: %{name}
Provider: %{provider}

What it means

Error "Vagrant can't use the requested machine because it is locked! This means that another Vagrant process is currently reading or modifying the machine. Please wait for that Vagrant process to end and try again. Details about the machine are shown below: Name: %{name} Provider: %{provider}" thrown in hashicorp/vagrant.

Source

Thrown at lib/vagrant/machine_index.rb:138

    # @return [MachineIndex::Entry]
    def get(uuid)
      entry = nil

      @lock.synchronize do
        with_index_lock do
          # Reload the data
          unlocked_reload

          data = find_by_prefix(uuid)
          return nil if !data
          uuid = data["id"]

          entry = Entry.new(uuid, data)

          # Lock this machine
          lock_file = lock_machine(uuid)
          if !lock_file
            raise Errors::MachineLocked,
              name: entry.name,
              provider: entry.provider
          end

          @machine_locks[uuid] = lock_file
        end
      end

      entry
    end

    # Tests if the index has the given UUID.
    #
    # @param [String] uuid
    # @return [Boolean]
    def include?(uuid)
      @lock.synchronize do
        with_index_lock do

View on GitHub (pinned to 35f3160f4a)

When it happens

Trigger: Thrown at lib/vagrant/machine_index.rb:138 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of hashicorp/vagrant@35f3160f4a (2026-08-21). Data as JSON: /api/errors/0522a3c8189d6f25. Report an issue: GitHub.