Note there is no hint on what the problem is. I would expect a log message "creating new disk of sizeX...", "Copying contents...", "Removing old disk..." or something.
Instead we get the message "Permission denied to unlink D:\backup\vms\Gitlab\box-disk1.vmdk" - which sounds like the plugin wanted to maliciously remove my VM hard drive.
C:/Users/bach_ar/.vagrant.d/gems/2.2.5/gems/vagrant-disksize-0.1.2/lib/vagrant/disksize/actions.rb:47:in `delete': Permission denied @ unlink_internal - D:\backup\vms\Gitlab\box-disk1.vmdk (Errno::EAC
CES)
from C:/Users/bach_ar/.vagrant.d/gems/2.2.5/gems/vagrant-disksize-0.1.2/lib/vagrant/disksize/actions.rb:47:in `ensure_disk_resizable'
from C:/Users/bach_ar/.vagrant.d/gems/2.2.5/gems/vagrant-disksize-0.1.2/lib/vagrant/disksize/actions.rb:24:in `call'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.9.3/lib/vagrant/action/warden.rb:34:in `call'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.9.3/plugins/providers/virtualbox/action/customize.rb:40:in `call'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.9.3/lib/vagrant/action/warden.rb:34:in `call'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.9.3/plugins/providers/virtualbox/action/sane_defaults.rb:38:in `call'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.9.3/lib/vagrant/action/warden.rb:34:in `call'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.9.3/lib/vagrant/action/builtin/set_hostname.rb:16:in `call'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.9.3/lib/vagrant/action/warden.rb:34:in `call'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.9.3/plugins/providers/virtualbox/action/forward_ports.rb:31:in `call'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.9.3/lib/vagrant/action/warden.rb:34:in `call'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.9.3/plugins/providers/virtualbox/action/network_fix_ipv6.rb:41:in `call'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.9.3/lib/vagrant/action/warden.rb:34:in `call'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.9.3/plugins/providers/virtualbox/action/network.rb:122:in `call'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.9.3/lib/vagrant/action/warden.rb:34:in `call'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.9.3/plugins/providers/virtualbox/action/clear_network_interfaces.rb:26:in `call'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.9.3/lib/vagrant/action/warden.rb:34:in `call'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.9.3/plugins/providers/virtualbox/action/prepare_nfs_settings.rb:18:in `call'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.9.3/lib/vagrant/action/warden.rb:34:in `call'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.9.3/lib/vagrant/action/builtin/synced_folders.rb:87:in `call'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.9.3/lib/vagrant/action/warden.rb:34:in `call'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.9.3/lib/vagrant/action/builtin/synced_folder_cleanup.rb:28:in `call'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.9.3/lib/vagrant/action/warden.rb:34:in `call'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.9.3/plugins/synced_folders/nfs/action_cleanup.rb:19:in `call'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.9.3/lib/vagrant/action/warden.rb:34:in `call'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.9.3/plugins/providers/virtualbox/action/prepare_nfs_valid_ids.rb:12:in `call'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.9.3/lib/vagrant/action/warden.rb:34:in `call'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.9.3/lib/vagrant/action/builtin/handle_forwarded_port_collisions.rb:49:in `call'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.9.3/lib/vagrant/action/warden.rb:34:in `call'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.9.3/plugins/providers/virtualbox/action/prepare_forwarded_port_collision_params.rb:30:in `call'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.9.3/lib/vagrant/action/warden.rb:34:in `call'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.9.3/lib/vagrant/action/builtin/env_set.rb:19:in `call'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.9.3/lib/vagrant/action/warden.rb:34:in `call'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.9.3/lib/vagrant/action/builtin/provision.rb:80:in `call'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.9.3/lib/vagrant/action/warden.rb:34:in `call'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.9.3/plugins/providers/virtualbox/action/clear_forwarded_ports.rb:15:in `call'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.9.3/lib/vagrant/action/warden.rb:34:in `call'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.9.3/plugins/providers/virtualbox/action/set_name.rb:50:in `call'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.9.3/lib/vagrant/action/warden.rb:34:in `call'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.9.3/plugins/providers/virtualbox/action/clean_machine_folder.rb:17:in `call'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.9.3/lib/vagrant/action/warden.rb:34:in `call'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.9.3/plugins/providers/virtualbox/action/check_accessible.rb:18:in `call'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.9.3/lib/vagrant/action/warden.rb:34:in `call'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.9.3/lib/vagrant/action/warden.rb:95:in `block in finalize_action'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.9.3/lib/vagrant/action/warden.rb:34:in `call'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.9.3/lib/vagrant/action/warden.rb:34:in `call'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.9.3/lib/vagrant/action/builder.rb:116:in `call'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.9.3/lib/vagrant/action/runner.rb:66:in `block in run'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.9.3/lib/vagrant/util/busy.rb:19:in `busy'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.9.3/lib/vagrant/action/runner.rb:66:in `run'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.9.3/lib/vagrant/action/builtin/call.rb:53:in `call'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.9.3/lib/vagrant/action/warden.rb:34:in `call'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.9.3/lib/vagrant/action/warden.rb:95:in `block in finalize_action'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.9.3/lib/vagrant/action/warden.rb:34:in `call'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.9.3/lib/vagrant/action/warden.rb:34:in `call'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.9.3/lib/vagrant/action/builder.rb:116:in `call'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.9.3/lib/vagrant/action/runner.rb:66:in `block in run'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.9.3/lib/vagrant/util/busy.rb:19:in `busy'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.9.3/lib/vagrant/action/runner.rb:66:in `run'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.9.3/lib/vagrant/action/builtin/call.rb:53:in `call'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.9.3/lib/vagrant/action/warden.rb:34:in `call'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.9.3/lib/vagrant/action/warden.rb:95:in `block in finalize_action'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.9.3/lib/vagrant/action/warden.rb:34:in `call'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.9.3/lib/vagrant/action/warden.rb:34:in `call'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.9.3/lib/vagrant/action/builder.rb:116:in `call'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.9.3/lib/vagrant/action/runner.rb:66:in `block in run'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.9.3/lib/vagrant/util/busy.rb:19:in `busy'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.9.3/lib/vagrant/action/runner.rb:66:in `run'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.9.3/lib/vagrant/action/builtin/call.rb:53:in `call'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.9.3/lib/vagrant/action/warden.rb:34:in `call'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.9.3/lib/vagrant/action/builtin/box_check_outdated.rb:23:in `call'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.9.3/lib/vagrant/action/warden.rb:34:in `call'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.9.3/lib/vagrant/action/builtin/config_validate.rb:25:in `call'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.9.3/lib/vagrant/action/warden.rb:34:in `call'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.9.3/plugins/providers/virtualbox/action/check_virtualbox.rb:17:in `call'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.9.3/lib/vagrant/action/warden.rb:34:in `call'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.9.3/lib/vagrant/action/warden.rb:95:in `block in finalize_action'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.9.3/lib/vagrant/action/warden.rb:34:in `call'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.9.3/lib/vagrant/action/warden.rb:34:in `call'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.9.3/lib/vagrant/action/warden.rb:95:in `block in finalize_action'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.9.3/lib/vagrant/action/warden.rb:34:in `call'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.9.3/lib/vagrant/action/warden.rb:34:in `call'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.9.3/lib/vagrant/action/builder.rb:116:in `call'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.9.3/lib/vagrant/action/runner.rb:66:in `block in run'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.9.3/lib/vagrant/util/busy.rb:19:in `busy'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.9.3/lib/vagrant/action/runner.rb:66:in `run'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.9.3/lib/vagrant/action/builtin/call.rb:53:in `call'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.9.3/lib/vagrant/action/warden.rb:34:in `call'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.9.3/lib/vagrant/action/builtin/config_validate.rb:25:in `call'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.9.3/lib/vagrant/action/warden.rb:34:in `call'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.9.3/lib/vagrant/action/warden.rb:95:in `block in finalize_action'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.9.3/lib/vagrant/action/warden.rb:34:in `call'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.9.3/lib/vagrant/action/warden.rb:34:in `call'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.9.3/lib/vagrant/action/warden.rb:95:in `block in finalize_action'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.9.3/lib/vagrant/action/warden.rb:34:in `call'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.9.3/lib/vagrant/action/warden.rb:34:in `call'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.9.3/lib/vagrant/action/builder.rb:116:in `call'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.9.3/lib/vagrant/action/runner.rb:66:in `block in run'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.9.3/lib/vagrant/util/busy.rb:19:in `busy'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.9.3/lib/vagrant/action/runner.rb:66:in `run'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.9.3/lib/vagrant/action/builtin/call.rb:53:in `call'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.9.3/lib/vagrant/action/warden.rb:34:in `call'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.9.3/plugins/providers/virtualbox/action/check_virtualbox.rb:17:in `call'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.9.3/lib/vagrant/action/warden.rb:34:in `call'
from C:/Users/bach_ar/.vagrant.d/gems/2.2.5/gems/vagrant-triggers-0.5.3/lib/vagrant-triggers/action/trigger.rb:17:in `call'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.9.3/lib/vagrant/action/warden.rb:34:in `call'
from C:/Users/bach_ar/.vagrant.d/gems/2.2.5/gems/vagrant-triggers-0.5.3/lib/vagrant-triggers/action/trigger.rb:17:in `call'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.9.3/lib/vagrant/action/warden.rb:34:in `call'
from C:/Users/bach_ar/.vagrant.d/gems/2.2.5/gems/vagrant-triggers-0.5.3/lib/vagrant-triggers/action/trigger.rb:17:in `call'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.9.3/lib/vagrant/action/warden.rb:34:in `call'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.9.3/lib/vagrant/action/builder.rb:116:in `call'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.9.3/lib/vagrant/action/runner.rb:66:in `block in run'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.9.3/lib/vagrant/util/busy.rb:19:in `busy'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.9.3/lib/vagrant/action/runner.rb:66:in `run'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.9.3/lib/vagrant/machine.rb:225:in `action_raw'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.9.3/lib/vagrant/machine.rb:200:in `block in action'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.9.3/lib/vagrant/environment.rb:567:in `lock'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.9.3/lib/vagrant/machine.rb:186:in `call'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.9.3/lib/vagrant/machine.rb:186:in `action'
from C:/Program Files (x86)/Vagrant/embedded/gems/gems/vagrant-1.9.3/lib/vagrant/batch_action.rb:82:in `block (2 levels) in run'
Using a disk size of 11GB afterwards succeeded, but I couldn´t use the extended space as the image was using bare partitions.
Note there is no hint on what the problem is. I would expect a log message "creating new disk of sizeX...", "Copying contents...", "Removing old disk..." or something. Instead we get the message "Permission denied to unlink D:\backup\vms\Gitlab\box-disk1.vmdk" - which sounds like the plugin wanted to maliciously remove my VM hard drive.
Using a disk size of 11GB afterwards succeeded, but I couldn´t use the extended space as the image was using bare partitions.