Error writing to a file froma SMB share - shared through VirtualBox

[GrizzlyWullf]

Summary: This problem is similar to ticket # 14252. Have upgraded to 5.0.2r102096, however, problem still exists. Did not have problem with version 4.3.28. Can create a file, delete the file, but cannot modify the file that is an SMB share, shared via VirtualBox to guest systems.

Issue: Connect a SMB share to Linux host and share it via VirtualBox to guest VMs. In Linux Guest VM access shared folder via mount /media/sf_Shared. Can create file, however, cannot modify file. Receive the following error: "The document cannot be saved, as it was not possible to write to /media/sf_Shared/lin.txt. Check that you have write access to this file or that enough disk space is available." In Linux guest delete file works. With a Windows 8.1 Guest VM access shared folder via G: drive (
vboxsvr\Shared). Can create file, however cannot modify file lin.txt. Receive error: "An unexpected error occurred while writing G:\lin.txt." In Windows guest delete file works. Also, created file from both Linux and Windows guest systems and then accessed the file from the host. Confirmed permissions set on the file were correct. Can modify the file via the host.

Temporary Workaround: In both Linux and Windows guest systems connect to SMB server directly (
mestor\Shared). Can modify files.

Host System: HP envy15t with 16GB RAM, Intel i7-4700MQ, Sandisk SSD 120GB drive Xubuntu - 15.04 - Vivid VirtualBox version 5.0.2 r102096

Linux Guest System: Kubuntu - 14.10 - utopic Guest Additions version 5.0.2r102096

Windows Guest System: Windows 8.1 - 6.3 build 9600 Guest Additions version 5.0.2r102096

Sincerely,

Charles

[GrizzlyWullf]

ProcMon log showing "INVALID PARAMETER" when trying to write file

[GrizzlyWullf]

PDF with screen caps showing smb mounts and mappings and guest system Shared Folders settings.