Stderr output

<core_client_version>8.0.4</core_client_version>
<![CDATA[
<message>
Unzul�ssige Funktion.
 (0x1) - exit code 1 (0x1)</message>
<stderr_txt>
2025-06-05 03:40:46 (9484): vboxwrapper version 26210
2025-06-05 03:40:46 (9484): BOINC client version: 8.0.4
2025-06-05 03:40:47 (9484): Detected: VirtualBox VboxManage Interface (Version: 7.1.8)
2025-06-05 03:40:47 (9484): Detected: Heartbeat check (file: 'heartbeat' every 1800.000000 seconds)
2025-06-05 03:40:47 (9484): Successfully copied 'init_data.xml' to the shared directory.
2025-06-05 03:40:47 (9484): Successfully copied 'input' to the shared directory.
2025-06-05 03:40:47 (9484): Create VM. (boinc_1a20fda9c20e3b60, slot#4)
2025-06-05 03:40:48 (9484): Setting Memory Size for VM. (630MB)
2025-06-05 03:40:48 (9484): Setting CPU Count for VM. (1)
2025-06-05 03:40:48 (9484): Setting Chipset Options for VM.
2025-06-05 03:40:49 (9484): Setting Graphics Controller Options for VM. (Driver: VBoxVGA, 16MB)
2025-06-05 03:40:49 (9484): Setting Boot Options for VM.
2025-06-05 03:40:49 (9484): Setting Network Configuration for NAT. (Driver: virtio)
2025-06-05 03:40:50 (9484): Enabling VM Network Access.
2025-06-05 03:40:50 (9484): Disabling USB Support for VM.
2025-06-05 03:40:50 (9484): Disabling COM Port Support for VM.
2025-06-05 03:40:51 (9484): Disabling LPT Port Support for VM.
2025-06-05 03:40:51 (9484): Disabling Audio Support for VM.
2025-06-05 03:40:51 (9484): Disabling Clipboard Support for VM.
2025-06-05 03:40:51 (9484): Disabling Drag and Drop Support for VM.
2025-06-05 03:40:52 (9484): Adding storage controller(s) to VM.
2025-06-05 03:40:52 (9484): Adding virtual disk drive to VM. (Theory_2025_04_17_prod.vdi)
2025-06-05 03:40:54 (9484): Adding VirtualBox Guest Additions to VM.
2025-06-05 03:40:54 (9484): Adding network bandwidth throttle group to VM. (Defaulting to 1024GB)
2025-06-05 03:40:54 (9484): forwarding host port 60516 to guest port 80
2025-06-05 03:40:55 (9484): Enabling remote desktop for VM.
2025-06-05 03:40:55 (9484): Enabling shared directory for VM.
2025-06-05 03:40:56 (9484): Starting VM using VBoxManage interface. (boinc_1a20fda9c20e3b60, slot#4)
2025-06-05 03:40:57 (9484): Error in start VM for VM: 1
Command:
VBoxManage -q startvm "boinc_1a20fda9c20e3b60" --type headless
Output:
VBoxManage.exe: error: The virtual machine 'boinc_1a20fda9c20e3b60' has terminated unexpectedly during startup with exit code 1 (0x1).  More details may be available in 'C:\ProgramData\BOINC\slots\4\boinc_1a20fda9c20e3b60\Logs\VBoxHardening.log'
VBoxManage.exe: error: Details: code E_FAIL (0x80004005), component MachineWrap, interface IMachine
Waiting for VM "boinc_1a20fda9c20e3b60" to power on...

2025-06-05 03:40:57 (9484): VM failed to start.
2025-06-05 03:40:57 (9484): Could not start 
2025-06-05 03:40:57 (9484): ERROR: VM failed to start
2025-06-05 03:40:57 (9484): Powering off VM.
2025-06-05 03:40:57 (9484): Deregistering VM. (boinc_1a20fda9c20e3b60, slot#4)
2025-06-05 03:40:57 (9484): Removing network bandwidth throttle group from VM.
2025-06-05 03:40:57 (9484): Removing VM from VirtualBox.

    Hypervisor System Log:

00:00:10.566396          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={e36a5081-a82a-40bd-9e4e-42a44d6ce50f} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:10.566402          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={e36a5081-a82a-40bd-9e4e-42a44d6ce50f} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:10.566407          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={e36a5081-a82a-40bd-9e4e-42a44d6ce50f} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:10.567282          Platform architecture set to 'x86'
00:00:10.567935          ERROR [COM]: aRC=E_FAIL (0x80004005) aIID={e36a5081-a82a-40bd-9e4e-42a44d6ce50f} aComponent={SessionMachine} aText={This machine does not have any snapshots}, preserve=false aResultDetail=0
00:00:10.597093          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={e36a5081-a82a-40bd-9e4e-42a44d6ce50f} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:10.597155          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={e36a5081-a82a-40bd-9e4e-42a44d6ce50f} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:10.597166          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={e36a5081-a82a-40bd-9e4e-42a44d6ce50f} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:10.597172          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={e36a5081-a82a-40bd-9e4e-42a44d6ce50f} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:10.597178          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={e36a5081-a82a-40bd-9e4e-42a44d6ce50f} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:10.597183          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={e36a5081-a82a-40bd-9e4e-42a44d6ce50f} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:10.597188          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={e36a5081-a82a-40bd-9e4e-42a44d6ce50f} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:10.597193          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={e36a5081-a82a-40bd-9e4e-42a44d6ce50f} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:10.597197          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={e36a5081-a82a-40bd-9e4e-42a44d6ce50f} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:10.597951          Platform architecture set to 'x86'
00:00:10.598958          Saving settings file "C:\ProgramData\BOINC\slots\4\boinc_1a20fda9c20e3b60\boinc_1a20fda9c20e3b60.vbox" with version "1.19-windows"
00:00:10.601010          Finished saving settings file "C:\ProgramData\BOINC\slots\4\boinc_1a20fda9c20e3b60\boinc_1a20fda9c20e3b60.vbox"
00:00:10.857534          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={e36a5081-a82a-40bd-9e4e-42a44d6ce50f} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:10.857553          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={e36a5081-a82a-40bd-9e4e-42a44d6ce50f} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:10.857560          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={e36a5081-a82a-40bd-9e4e-42a44d6ce50f} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:10.857566          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={e36a5081-a82a-40bd-9e4e-42a44d6ce50f} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:10.857571          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={e36a5081-a82a-40bd-9e4e-42a44d6ce50f} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:10.857577          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={e36a5081-a82a-40bd-9e4e-42a44d6ce50f} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:10.857582          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={e36a5081-a82a-40bd-9e4e-42a44d6ce50f} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:10.857588          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={e36a5081-a82a-40bd-9e4e-42a44d6ce50f} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:10.857593          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={e36a5081-a82a-40bd-9e4e-42a44d6ce50f} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:10.857818          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={e36a5081-a82a-40bd-9e4e-42a44d6ce50f} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:10.857832          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={e36a5081-a82a-40bd-9e4e-42a44d6ce50f} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:10.857839          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={e36a5081-a82a-40bd-9e4e-42a44d6ce50f} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:10.857844          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={e36a5081-a82a-40bd-9e4e-42a44d6ce50f} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:10.857849          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={e36a5081-a82a-40bd-9e4e-42a44d6ce50f} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:10.857853          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={e36a5081-a82a-40bd-9e4e-42a44d6ce50f} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:10.857858          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={e36a5081-a82a-40bd-9e4e-42a44d6ce50f} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:10.857863          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={e36a5081-a82a-40bd-9e4e-42a44d6ce50f} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:10.857867          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={e36a5081-a82a-40bd-9e4e-42a44d6ce50f} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:10.857924          Saving settings file "C:\Users\Ole\.VirtualBox\VirtualBox.xml" with version "1.12-windows"
00:00:10.868065          Finished saving settings file "C:\Users\Ole\.VirtualBox\VirtualBox.xml"
00:00:10.868162          Saving settings file "C:\Users\Ole\.VirtualBox\VirtualBox.xml" with version "1.12-windows"
00:00:10.887615          Finished saving settings file "C:\Users\Ole\.VirtualBox\VirtualBox.xml"
00:00:10.888346 DeleteVM Saving settings file "C:\Users\Ole\.VirtualBox\VirtualBox.xml" with version "1.12-windows"
00:00:10.890463 DeleteVM Finished saving settings file "C:\Users\Ole\.VirtualBox\VirtualBox.xml"
00:00:15.901876 main     VirtualBox: object deletion starts
00:00:15.902526 main     HostDnsMonitor: shutting down ...
00:00:15.902571 main     HostDnsMonitor: shut down
00:00:15.903604 Watcher  ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={d644ad1e-c501-4fc7-9ab6-aa6d763bc540} aComponent={VirtualBoxWrap} aText={The object is not ready}, preserve=false aResultDetail=0
00:00:15.903733 main     VirtualBox: object deleted

    VM Execution Log:


    VM Startup Log:


    VM Trace Log:

rding_started="off"
recording_enabled="off"
recording_screens=1
 rec_screen0
rec_screen_enabled="on"
rec_screen_id=0
rec_screen_video_enabled="on"
rec_screen_audio_enabled="off"
rec_screen_dest="File"
rec_screen_dest_filename="C:\\ProgramData\\BOINC\\slots\\4\\boinc_1a20fda9c20e3b60\\boinc_1a20fda9c20e3b60-screen0.webm"
rec_screen_opts="vc_enabled=true,ac_enabled=false,ac_profile=med"
rec_screen_video_res_xy="1024x768"
rec_screen_video_rate_kbps=512
rec_screen_video_fps=25
description="Theory_2914-4622308-10_1"
GuestMemoryBalloon=0

2025-06-05 03:40:50 (9484): 
Command: VBoxManage -q modifyvm "boinc_1a20fda9c20e3b60" --nic1 nat --nic-type1 "virtio" --cable-connected1 off --nat-dns-proxy1 on 
Exit Code: 0
Output:

2025-06-05 03:40:50 (9484): 
Command: VBoxManage -q modifyvm "boinc_1a20fda9c20e3b60" --cable-connected1 on 
Exit Code: 0
Output:

2025-06-05 03:40:50 (9484): 
Command: VBoxManage -q modifyvm "boinc_1a20fda9c20e3b60" --usb off 
Exit Code: 0
Output:

2025-06-05 03:40:51 (9484): 
Command: VBoxManage -q modifyvm "boinc_1a20fda9c20e3b60" --uart1 off --uart2 off 
Exit Code: 0
Output:

2025-06-05 03:40:51 (9484): 
Command: VBoxManage -q modifyvm "boinc_1a20fda9c20e3b60" --lpt1 off --lpt2 off 
Exit Code: 0
Output:

2025-06-05 03:40:51 (9484): 
Command: VBoxManage -q modifyvm "boinc_1a20fda9c20e3b60" --audio-enabled off 
Exit Code: 0
Output:

2025-06-05 03:40:51 (9484): 
Command: VBoxManage -q modifyvm "boinc_1a20fda9c20e3b60" --clipboard disabled 
Exit Code: 0
Output:

2025-06-05 03:40:52 (9484): 
Command: VBoxManage -q modifyvm "boinc_1a20fda9c20e3b60" --draganddrop disabled 
Exit Code: 0
Output:

2025-06-05 03:40:52 (9484): 
Command: VBoxManage -q storagectl "boinc_1a20fda9c20e3b60" --name "Hard Disk Controller" --add "sata" --controller "IntelAHCI" --hostiocache off --portcount 3
Exit Code: 0
Output:

2025-06-05 03:40:52 (9484): 
Command: VBoxManage -q showhdinfo "C:\ProgramData\BOINC/projects/lhcathome.cern.ch_lhcathome/Theory_2025_04_17_prod.vdi" 
Exit Code: 0
Output:
UUID:           b1b25507-41e2-4ead-9ca8-6f5e1c8e2ce4
Parent UUID:    base
State:          created
Type:           multiattach
Location:       C:\ProgramData\BOINC\projects\lhcathome.cern.ch_lhcathome\Theory_2025_04_17_prod.vdi
Storage format: VDI
Format variant: dynamic default
Capacity:       10240 MBytes
Size on disk:   2451 MBytes
Encryption:     disabled
Property:       AllocationBlockSize=1048576

2025-06-05 03:40:52 (9484): 
Command: VBoxManage -q storageattach "boinc_1a20fda9c20e3b60" --storagectl "Hard Disk Controller" --port 0 --device 0 --type hdd --mtype multiattach --medium "C:\ProgramData\BOINC/projects/lhcathome.cern.ch_lhcathome/Theory_2025_04_17_prod.vdi" 
Exit Code: -2135228409
Output:
VBoxManage.exe: error: Cannot attach medium 'C:\ProgramData\BOINC\projects\lhcathome.cern.ch_lhcathome\Theory_2025_04_17_prod.vdi': the media type 'MultiAttach' can only be attached to machines that were created with VirtualBox 4.0 or later
VBoxManage.exe: error: Details: code VBOX_E_INVALID_OBJECT_STATE (0x80bb0007), component SessionMachine, interface IMachine, callee IUnknown
VBoxManage.exe: error: Context: "AttachDevice(Bstr(pszCtl).raw(), port, device, DeviceType_HardDisk, pMedium2Mount)" at line 786 of file VBoxManageStorageController.cpp

2025-06-05 03:40:53 (9484): 
Command: VBoxManage -q showhdinfo "C:\ProgramData\BOINC/projects/lhcathome.cern.ch_lhcathome/Theory_2025_04_17_prod.vdi" 
Exit Code: 0
Output:
UUID:           b1b25507-41e2-4ead-9ca8-6f5e1c8e2ce4
Parent UUID:    base
State:          created
Type:           multiattach
Location:       C:\ProgramData\BOINC\projects\lhcathome.cern.ch_lhcathome\Theory_2025_04_17_prod.vdi
Storage format: VDI
Format variant: dynamic default
Capacity:       10240 MBytes
Size on disk:   2451 MBytes
Encryption:     disabled
Property:       AllocationBlockSize=1048576

2025-06-05 03:40:53 (9484): 
Command: VBoxManage -q closemedium disk "C:\ProgramData\BOINC\projects\lhcathome.cern.ch_lhcathome\Theory_2025_04_17_prod.vdi" 
Exit Code: 0
Output:

2025-06-05 03:40:53 (9484): 
Command: VBoxManage -q showhdinfo "C:\ProgramData\BOINC/projects/lhcathome.cern.ch_lhcathome/Theory_2025_04_17_prod.vdi" 
Exit Code: 0
Output:
UUID:           b1b25507-41e2-4ead-9ca8-6f5e1c8e2ce4
Parent UUID:    base
State:          created
Type:           normal (base)
Location:       C:\ProgramData\BOINC\projects\lhcathome.cern.ch_lhcathome\Theory_2025_04_17_prod.vdi
Storage format: VDI
Format variant: dynamic default
Capacity:       10240 MBytes
Size on disk:   2451 MBytes
Encryption:     disabled
Property:       AllocationBlockSize=1048576

2025-06-05 03:40:53 (9484): 
Command: VBoxManage -q storageattach "boinc_1a20fda9c20e3b60" --storagectl "Hard Disk Controller" --port 0 --device 0 --type hdd --medium "C:\ProgramData\BOINC/projects/lhcathome.cern.ch_lhcathome/Theory_2025_04_17_prod.vdi" 
Exit Code: 0
Output:

2025-06-05 03:40:54 (9484): 
Command: VBoxManage -q storageattach "boinc_1a20fda9c20e3b60" --storagectl "Hard Disk Controller" --port 0 --device 0 --type hdd --medium none 
Exit Code: 0
Output:

2025-06-05 03:40:54 (9484): 
Command: VBoxManage -q storageattach "boinc_1a20fda9c20e3b60" --storagectl "Hard Disk Controller" --port 0 --device 0 --type hdd --mtype multiattach --medium "C:\ProgramData\BOINC/projects/lhcathome.cern.ch_lhcathome/Theory_2025_04_17_prod.vdi" 
Exit Code: 0
Output:

2025-06-05 03:40:54 (9484): 
Command: VBoxManage -q storageattach "boinc_1a20fda9c20e3b60" --storagectl "Hard Disk Controller" --port 1 --device 0 --type dvddrive --medium "C:\Program Files\Oracle\VirtualBox/VBoxGuestAdditions.iso" 
Exit Code: 0
Output:

2025-06-05 03:40:54 (9484): 
Command: VBoxManage -q bandwidthctl "boinc_1a20fda9c20e3b60" add "boinc_1a20fda9c20e3b60_net" --type network --limit 1024G 
Exit Code: 0
Output:

2025-06-05 03:40:55 (9484): 
Command: VBoxManage -q modifyvm "boinc_1a20fda9c20e3b60" --natpf1 ",tcp,127.0.0.1,60516,,80" 
Exit Code: 0
Output:

2025-06-05 03:40:55 (9484): 
Command: VBoxManage -q list extpacks
Exit Code: 0
Output:
Extension Packs: 1
Pack no. 0:   Oracle VM VirtualBox Extension Pack
Version:        6.1.28
Revision:       147628
Edition:        
Description:    Oracle Cloud Infrastructure integration, USB 2.0 and USB 3.0 Host Controller, Host Webcam, VirtualBox RDP, PXE ROM, Disk Encryption, NVMe.
VRDE Module:    VBoxVRDP
Crypto Module:  
Usable:         false
Why unusable:   VBoxExtPackRegister returned VERR_VERSION_MISMATCH, pReg=0000000000000000 ErrInfo='Helper version mismatch - expected 0x30000 got 0x50000'

2025-06-05 03:40:55 (9484): 
Command: VBoxManage -q modifyvm "boinc_1a20fda9c20e3b60" --vrde on --vrdeextpack default --vrdeauthlibrary default --vrdeauthtype null --vrdeport 60517 --vrde-property "Security/Method=RDP" 
Exit Code: 0
Output:

2025-06-05 03:40:56 (9484): 
Command: VBoxManage -q sharedfolder add "boinc_1a20fda9c20e3b60" --name "shared" --hostpath "C:\ProgramData\BOINC\slots\4/shared"
Exit Code: 0
Output:

2025-06-05 03:40:57 (9484): 
Command: VBoxManage -q startvm "boinc_1a20fda9c20e3b60" --type headless
Exit Code: 1
Output:
VBoxManage.exe: error: The virtual machine 'boinc_1a20fda9c20e3b60' has terminated unexpectedly during startup with exit code 1 (0x1).  More details may be available in 'C:\ProgramData\BOINC\slots\4\boinc_1a20fda9c20e3b60\Logs\VBoxHardening.log'
VBoxManage.exe: error: Details: code E_FAIL (0x80004005), component MachineWrap, interface IMachine
Waiting for VM "boinc_1a20fda9c20e3b60" to power on...

2025-06-05 03:40:57 (9484): 
Command: VBoxManage -q snapshot "boinc_1a20fda9c20e3b60" list 
Exit Code: -108
Output:
This machine does not have any snapshots

2025-06-05 03:40:57 (9484): 
Command: VBoxManage -q bandwidthctl "boinc_1a20fda9c20e3b60" remove "boinc_1a20fda9c20e3b60_net" 
Exit Code: 0
Output:

2025-06-05 03:40:57 (9484): 
Command: VBoxManage -q unregistervm "boinc_1a20fda9c20e3b60" --delete 
Exit Code: 0
Output:
0%...10%...20%...30%...40%...50%...60%...70%...80%...90%...100%

2025-06-05 03:41:03 (9484): called boinc_finish(1)

</stderr_txt>
]]>

©2025 CERN