Shared Folders from Linux Guest VM not accessible

[PeterE]

After an update from Arch Linux 4.15.12-1 to 4.18.3 the use of shared folders in a Linux Guest VM is broken. The VirtualBox drivers were updated from 5.2.8 to 5.2.18.

During the build of my Arch Linux I performed the following steps: I created a file /etc/modules-load.d/virtualbox.conf with three lines:

vboxguest
vboxsf
vboxvideo

Then I entered:

pacman -S virtualbox-guest-modules-arch
pacman -S virtualbox-guest-utils
systemctl enable vboxservice.service
reboot

My Arch Linux systems were running without problems for more than a year. I had several updates in between. After the last update I can’t access the files on the Windows host via shared folders. Every time I boot I get the following error message in front of the login prompt: vboxsf: Old binary mount data not supported, remove obsolete mount.vboxsf and/or update your VBoxService.

My mount as a user in .bashrc doesn’t work:

sudo mount -t vboxsf D_DRIVE /home/peter/d

I have tried a lot to find a solution. I have renamed or removed the following files:

/usr/lib/virtualbox/mount.vboxsf
/usr/bin/mount.vboxsf
/etc/modules-load.d/virtualbox.conf

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Then I have built a completely new Arch Linux VM system with Kernel 4.18.5. I know that since kernel 4.16 the modules vboxguest and vboxvideo are integrated into the kernel. I don’t get the error message, but I can not mount as root:

mount -cit vboxsf D_DRIVE d

I have tried to blacklist the vboxguest module and install the drivers like above. Then I get the error message.

I think there is a bug in the vboxguest modules.