Exclusive locks are not supported for this stream

I have the same problem. I know your post is 10 months old.

With this method http://php.net/manual/en/function.file-put-contents.php you set LOCK_EX parameter. PHP has some http://php.net/manual/en/filesystem.constants.php Constants.

I my case is the nfs mount a problem. But i don't know how i can fix it. Maybe you use vagrant to?

Try to edit your config...

'local' => [
            'driver' => 'local',
            'root'   => storage_path('app'),
        ],

to:

'local' => [
            'driver' => 'local',
            'root'   => '/tmp/',
        ],

It works well on my VM. The problem was the NFS share. Maybe the NFS protocol doesn't have this feature.

I know its an old post, but as it seems there is not a solution posted, here is what worked for me:

I had this issue today due NFS share, I'm on a windows 10 host using Homestead. I fixed by adding the 'nolock' option in Homestead/scripts/homestead.rb

So the full shared folder registration block looks like this:

    # Register All Of The Configured Shared Folders
    if settings.include? 'folders'
      settings["folders"].sort! { |a,b| a["map"].length <=> b["map"].length }
      settings["folders"].each do |folder|
        mount_opts = []

        if (folder["type"] == "nfs")
            mount_opts = folder["mount_options"] ? folder["mount_options"] : ['actimeo=1','nolock']
        elsif (folder["type"] == "smb")
            mount_opts = folder["mount_options"] ? folder["mount_options"] : ['vers=3.02', 'mfsymlinks']
        end

        # For b/w compatibility keep separate 'mount_opts', but merge with options
        options = (folder["options"] || {}).merge({ mount_options: mount_opts })

        # Double-splat (**) operator only works with symbol keys, so convert
        options.keys.each{|k| options[k.to_sym] = options.delete(k) }

        config.vm.synced_folder folder["map"], folder["to"], type: folder["type"] ||= nil, **options

        # Bindfs support to fix shared folder (NFS) permission issue on Mac
        if Vagrant.has_plugin?("vagrant-bindfs")
          config.bindfs.bind_folder folder["to"], folder["to"]
        end
      end
    end

I hope it helps somebody,

To chime in - I just ran into this issue and just as JorgeNeira stated above, the problem is with NFS shares. But my situation might be slightly different. Just posting here to document, if someone needs it.

I'm using VirtualBox 6 on MacOS .

I ran into the issue when I brought up a new box but it did not have the VM VirtualBox Extension Pack installed, as I had installed it with a previous box. I'm not certain if VirtualBox installs the extension pack automagically when creating a new, additional box. Reinstalling the extension pack resolved the issue without config changes.

Old post, sorry, but I looked around and did not find a solution for my particular problem anywhere. In my case, it was Apparmor. You need to add a "k" permission to your storage directory and below.

In my case I have created a file called /etc/apparmor.d/local/php-fpm and I put all my overrides there.

/websites/*/root/storage/** rwk,

In Ubuntu, you will find Apparmor logs in /var/logs/audit/audit.log. I always forget to look there, when some unexpected issue arises that involves permissions...