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Ticket Resolution Summary Owner Reporter
#16697 duplicate Guest Additions shared folders broken with 5.1.20 on RHEL 7 cknz
Description

Blogged at http://distracted-it.blogspot.co.nz/2017/04/virtualbox-5120-bug-with-shared-folders.html

After installing GA for 5.1.20, shared folders no longer mount:

# mount host_home
mount: wrong fs type, bad option, bad superblock on host_home,
       missing codepage or helper program, or other error

       In some cases useful info is found in syslog - try
       dmesg | tail or so.

# dmesg | tail
...
[  334.616717] vboxsf: Successfully loaded version 5.1.20 (interface 0x00010004)
[  343.413650] sf_read_super_aux err=-22

Looking around the problem is caused by a broken symlink to mount.vboxsf

# updatedb

# locate mount.vbox
/opt/VBoxGuestAdditions-5.1.20/lib/VBoxGuestAdditions/mount.vboxsf
/usr/sbin/mount.vboxsf

# ls -l /usr/sbin/mount.vboxsf 
lrwxrwxrwx. 1 root root 49 Apr 26 10:04 /usr/sbin/mount.vboxsf 
    -> /opt/VBoxGuestAdditions-5.1.20/other/mount.vboxsf

Aha, it seems that mount.vboxsf is a broken link; the following are not the same:

/opt/VBoxGuestAdditions-5.1.20/lib/VBoxGuestAdditions/mount.vboxsf  <--- available
/opt/VBoxGuestAdditions-5.1.20/other/mount.vboxsf                   <--- pointed at

Bit of a quicky fix:

# rm -f /usr/sbin/mount.vboxsf

# ln -s /opt/VBoxGuestAdditions-5.1.20/lib/VBoxGuestAdditions/mount.vboxsf \
    /usr/sbin/mount.vboxsf

# ls -l /usr/sbin/mount.vboxsf 
lrwxrwxrwx. 1 root root 66 Apr 26 10:16 /usr/sbin/mount.vboxsf 
    -> /opt/VBoxGuestAdditions-5.1.20/lib/VBoxGuestAdditions/mount.vboxsf
Moment of truth:

# mount host_home

$ mount
...
host_home on /home/ckerr/host_home type vboxsf (rw,nodev,relatime)
#16693 fixed GL libraries not detected and none ending process. Steve Moyes
Description

Hi, Windows guest is unable to start with 3D acceleration enabled. Having only 2D enabled results in Windows booting to a black screen.

First symptom: Starting virtualbox on the cli gets:

$ virtualbox
libGL error: unable to load driver: i965_dri.so
libGL error: driver pointer missing
libGL error: failed to load driver: i965
libGL error: unable to load driver: i965_dri.so
libGL error: driver pointer missing
libGL error: failed to load driver: i965
libGL error: unable to load driver: swrast_dri.so
libGL error: failed to load driver: swrast

Second symptom: Closing the GUI window does not always end the process (also experienced on a Windows host). CTRL-C has to be used.

Third symptom: Trying to start a VM with 3D acceleration gets the error:

Failed to open a session for the virtual machine win10.
The VM session was aborted.
Result Code: NS_ERROR_FAILURE (0x80004005)
Component: SessionMachine
Interface: ISession {7844aa05-b02e-4cdd-a04f-ade4a762e6b7}

Downgrading to version 5.1.18 resolves all of the above.

#16689 duplicate HostAudioNotResponding after update to 5.1.20 jay214128
Description

After updating to version 5.1.20, I get the warning popup about the HostAudioNotResponding and no sound in the guest. Host system is Ubuntu 16.04. Guest is Windows 7 64-bit.

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