discard fails with Accessibility check was not yet performed

[Jim O'Connor]

When I try to delete a snapshot of a VM with an immutable disk, I get the following error:

VirtualBox Command Line Management Interface Version 2.1.2 (C) 2005-2009 Sun Microsystems, Inc. All rights reserved.

0%...10%...20%...30%...40%...50%...60%...FAILED Error: failed to discard. Error message: Medium '/engine/native/vmm/virtualbox/dsl-linux/instances/linux01/linux01/Snapshots/{e639aca4-81b9-4986-a475-3304563db1df}.vdi' is not accessible. Accessibility check was not yet performed

The following script produces this error:

============= zen:test jim$ cat manual.sh /usr/bin/VBoxManage registerimage disk /engine/native/vmm/virtualbox/dsl-linux/vdi/dsl-linux-master.vdi -type immutable

/usr/bin/VBoxManage createvm -name linux01 -register -basefolder /engine/native/vmm/virtualbox/dsl-linux/instances/linux01

/usr/bin/VBoxManage modifyvm linux01 -memory 256 -vrdpport 3390 -hda /engine/native/vmm/virtualbox/dsl-linux/vdi/dsl-linux-master.vdi

/usr/bin/VBoxHeadless -s linux01 &

sleep 20

/usr/bin/VBoxManage snapshot linux01 take base

/usr/bin/VBoxManage controlvm linux01 poweroff

sleep 20

VBoxManage snapshot linux01 discardcurrent -all =============

There seems to be a race condition with this error. If I change the final sleep in the script to "sleep 5", the discardcurrent works every time. With it set to 20, it fails every time.

============= Here is the complete output from running the script (with the sleep set to 20):

zen:test jim$ ./manual.sh VirtualBox Command Line Management Interface Version 2.1.2 (C) 2005-2009 Sun Microsystems, Inc. All rights reserved.

VirtualBox Command Line Management Interface Version 2.1.2 (C) 2005-2009 Sun Microsystems, Inc. All rights reserved.

Virtual machine 'linux01' is created and registered. UUID: 56bf98f6-9ed9-4067-b247-90850f4e9996 Settings file: '/engine/native/vmm/virtualbox/dsl-linux/instances/linux01/linux01/linux01.xml' VirtualBox Command Line Management Interface Version 2.1.2 (C) 2005-2009 Sun Microsystems, Inc. All rights reserved.

VirtualBox Headless Interface 2.1.2 (C) 2008-2009 Sun Microsystems, Inc. All rights reserved.

Listening on port 3390 VirtualBox Command Line Management Interface Version 2.1.2 (C) 2005-2009 Sun Microsystems, Inc. All rights reserved.

0%...10%...20%...30%...40%...50%...60%...70%...80%...90%...100% VirtualBox Command Line Management Interface Version 2.1.2 (C) 2005-2009 Sun Microsystems, Inc. All rights reserved.

VirtualBox Command Line Management Interface Version 2.1.2 (C) 2005-2009 Sun Microsystems, Inc. All rights reserved.

0%...10%...20%...30%...40%...50%...60%...FAILED Error: failed to discard. Error message: Medium '/engine/native/vmm/virtualbox/dsl-linux/instances/linux01/linux01/Snapshots/{0496f61c-d92b-4fc8-8a35-9b44a3fd09e1}.vdi' is not accessible. Accessibility check was not yet performed

=============

The above error occurs on Windows XP, Centos, and Mac OSX. This is a showstopper for me because it prevents be from deleting my VM (except for manually editing the VirtualBox.xml).

BTW, it would be really nice to be able to delete a VM, snapshots and all, with a single command.

[Jim O'Connor]

This is a regression error. The above functionality works fine in VirtualBox 2.0.6.

[Rudolf Blazek]

This problem persists in Virtual Box 2.1.4 and after upgrading also in 2.2.0 !! It should be addressed ASAP because it makes the snapshot function completely unusable which is a disaster.

Thanks! Rudy

VBox: 2.2.0 (and 2.1.4) Host: Ubuntu server 8.04 LTS
Guest: Ubuntu JeOS 8.04 (but the problem is guest-independent)
Tool used: VBoxManage

Snapshots:
Name: Initial Install with Host Networking (UUID: e50fc48a-c441-4026-9671-d2079f3e75a7)
Name: Initial Install with Host Networking (UUID: 42319365-7b3f-44db-81c7-f50785da1e68)
Name: Backup 2009 Apr 11 19:23:22 (UUID: 44800c3d-bd90-4750-b399-3addd62b77f7)
Name: Backup 2009 Apr 11 19:24:02 (UUID: 53c5b44e-3207-41d9-a5e4-fd8aedb95e7e)

testvm@host$ VBoxManage snapshot TestVM discard "Backup 2009 Apr 11 19:23:22"
VirtualBox Command Line Management Interface Version 2.2.0
(C) 2005-2009 Sun Microsystems, Inc.
All rights reserved.

0%...FAILED
Error: failed to discard snapshot. Error message: Medium 
'/home/testvm/.VirtualBox/Machines/TestVM/Snapshots/{b37af01d-0eb5-4ed4-b398-f25185de6928}.vdi' 
is not accessible. Accessibility check was not yet performed

[aeichner]

Please reopen if still relevant with a recent VirtualBox release.