[aur-general] Virtualbox quite suddenly can't access shared folder anymore

[Ralf Mardorf]

   A. I'm out of ideas.

The Windows 7 guest crashes, if I try to access the shared folder /mnt/winos7/winOS_2/ with this content:

[rocketmouse at archlinux ~]$ ls -hAl /mnt/winos7/winOS_2/
total 417M
-rw-r--r-- 1 rocketmouse rocketmouse 155M Jul 28 17:09 iCloudSetup.exe
-rw-r--r-- 1 rocketmouse rocketmouse 263M Jul 28 17:12 iTunes64Setup.exe
-rw-r--r-- 1 rocketmouse rocketmouse    0 Jul 28 17:40 test.txt
[rocketmouse at archlinux ~]$ grep VERR_VM_DRIVER_NOT_ACCESSIBLE .VirtualBox/VBoxSVC.log
00:00:00.117543 nspr-2   Failed to open "/dev/vboxdrvu", errno=13, rc=VERR_VM_DRIVER_NOT_ACCESSIBLE
00:00:00.561476 nspr-4   Failed to open "/dev/vboxdrvu", errno=13, rc=VERR_VM_DRIVER_NOT_ACCESSIBLE

The Windows 7 guest can open the shared folder without any issue, if this is the content:

[rocketmouse at archlinux ~]$ ls -hAl /mnt/winos7/winOS_2/
total 0
-rw-r--r-- 1 rocketmouse rocketmouse 0 Jul 28 17:40 test.txt
[rocketmouse at archlinux ~]$ grep VERR_VM_DRIVER_NOT_ACCESSIBLE .VirtualBox/VBoxSVC.log
00:00:00.116380 nspr-2   Failed to open "/dev/vboxdrvu", errno=13, rc=VERR_VM_DRIVER_NOT_ACCESSIBLE
00:00:00.561547 nspr-3   Failed to open "/dev/vboxdrvu", errno=13, rc=VERR_VM_DRIVER_NOT_ACCESSIBLE

In both cases the log shows "VERR_VM_DRIVER_NOT_ACCESSIBLE".

Still ok, but a fishy log:

[rocketmouse at archlinux ~]$ ls -hAl /mnt/winos7/winOS_2/
total 4.0K
drwxr-xr-x 11 rocketmouse rocketmouse 4.0K Jul 19 03:58 auriapro-2019-jul-19-TESTCOPY
-rw-r--r--  1 rocketmouse rocketmouse    0 Jul 28 17:40 test.txt
[rocketmouse at archlinux ~]$ grep VERR_VM_DRIVER_NOT_ACCESSIBLE .VirtualBox/VBoxSVC.log
00:00:00.131207 nspr-2   Failed to open "/dev/vboxdrvu", errno=13, rc=VERR_VM_DRIVER_NOT_ACCESSIBLE
00:00:00.888320 nspr-3   Failed to open "/dev/vboxdrvu", errno=13, rc=VERR_VM_DRIVER_NOT_ACCESSIBLE

Still ok:
[rocketmouse at archlinux ~]$ ls -hAl /mnt/winos7/winOS_2/
total 32M
drwxr-xr-x 11 rocketmouse rocketmouse 4.0K Jul 19 03:58 auriapro-2019-jul-19-TESTCOPY
-rw-r--r--  1 rocketmouse rocketmouse  32M Jul 28 18:03 GR-55FloorBoard_Setup.exe
-rw-r--r--  1 rocketmouse rocketmouse    0 Jul 28 17:40 test.txt

Crash:
[rocketmouse at archlinux ~]$ ls -hAl /mnt/winos7/winOS_2/
total 295M
drwxr-xr-x 11 rocketmouse rocketmouse 4.0K Jul 19 03:58 auriapro-2019-jul-19-TESTCOPY
-rw-r--r--  1 rocketmouse rocketmouse  32M Jul 28 18:03 GR-55FloorBoard_Setup.exe
-rw-r--r--  1 rocketmouse rocketmouse 263M Jul 28 17:12 iTunes64Setup.exe
-rw-r--r--  1 rocketmouse rocketmouse    0 Jul 28 17:40 test.txt

Just in case I removed anti virus software from the guest install, but
it still crashes with the iTunes64Setup.exe in the shared folder.

The only change for the guest from working to broken was an update of
the anti virus software's data base.

IIRC the original log file from the backup doesn't contain "Failed to
open "/dev/vboxdrvu", errno=13, rc=VERR_VM_DRIVER_NOT_ACCESSIBLE", so I
still suspect the host, not the guest. I'll restore from the backup
later.