Mounting share directory on Linux host result in Protocol error if default share name is used

[Paul Siu]

Host is Ubuntu 7.10. Guest is Linux Mint 4.0

I created a new shared directory using the GUI in a machine's setting. The GUI will prompt me to select a host directory for the shared directory. When I select the share directory, a share name is automatically generated. So if I select the directory "/home/paulsiu/vshare", the share name "vshare" is created.

If I attempt to mount the vshare using the following command in the Linux Guest I get the following error:

sudo mount -t vboxsf vshare /home/paulsiu/share /sbin/mount.vboxsf: mounting failed with the error: Protocol error

The syslog will have the error:

Oct 8 18:27:09 wxbuilder kernel: vboxvfs: sf_glob_alloc: vboxCallMapFolder failed rc=-102 Oct 8 18:27:09 wxbuilder kernel: sf_read_super_aux err=-71

Now suppose I go back into the GUI and change the "vshare" to "vshare2". The following mount command will work:

sudo mount -t vboxsf vshare2 /home/paulsiu/share

For some reason, whatever Virtualbox select as the default share name will always fail to mount. If you pick something else, it will work.