Stderr output

<core_client_version>8.2.4</core_client_version>
<![CDATA[
<message>
Incorrect function.
 (0x1) - exit code 1 (0x1)</message>
<stderr_txt>
2025-10-10 20:12:30 (20144): vboxwrapper version 26210
2025-10-10 20:12:30 (20144): BOINC client version: 8.2.4
2025-10-10 20:12:31 (20144): Detected: VirtualBox VboxManage Interface (Version: 7.0.6)
2025-10-10 20:12:32 (20144): Successfully copied 'init_data.xml' to the shared directory.
2025-10-10 20:12:32 (20144): Create VM. (boinc_c63ae51e888dcc0e, slot#38)
2025-10-10 20:12:32 (20144): Setting Memory Size for VM. (4800MB)
2025-10-10 20:12:33 (20144): Setting CPU Count for VM. (8)
2025-10-10 20:12:33 (20144): Setting Chipset Options for VM.
2025-10-10 20:12:33 (20144): Setting Graphics Controller Options for VM. (Driver: VBoxVGA, 16MB)
2025-10-10 20:12:33 (20144): Setting Boot Options for VM.
2025-10-10 20:12:34 (20144): Setting Network Configuration for NAT. (Driver: virtio)
2025-10-10 20:12:34 (20144): Enabling VM Network Access.
2025-10-10 20:12:34 (20144): Disabling USB Support for VM.
2025-10-10 20:12:35 (20144): Disabling COM Port Support for VM.
2025-10-10 20:12:35 (20144): Disabling LPT Port Support for VM.
2025-10-10 20:12:35 (20144): Disabling Audio Support for VM.
2025-10-10 20:12:36 (20144): Disabling Clipboard Support for VM.
2025-10-10 20:12:36 (20144): Disabling Drag and Drop Support for VM.
2025-10-10 20:12:36 (20144): Adding storage controller(s) to VM.
2025-10-10 20:12:36 (20144): Adding virtual disk drive to VM. (ATLAS_vbox_3.03_image.vdi)
2025-10-10 20:12:38 (20144): Adding VirtualBox Guest Additions to VM.
2025-10-10 20:12:39 (20144): Adding network bandwidth throttle group to VM. (Defaulting to 1024GB)
2025-10-10 20:12:39 (20144): forwarding host port 59403 to guest port 80
2025-10-10 20:12:39 (20144): Enabling remote desktop for VM.
2025-10-10 20:12:40 (20144): Enabling shared directory for VM.
2025-10-10 20:12:40 (20144): Starting VM using VBoxManage interface. (boinc_c63ae51e888dcc0e, slot#38)
2025-10-10 20:12:41 (20144): Error in start VM for VM: 1
Command:
VBoxManage -q startvm "boinc_c63ae51e888dcc0e" --type headless
Output:
VBoxManage.exe: error: The virtual machine 'boinc_c63ae51e888dcc0e' has terminated unexpectedly during startup with exit code 1 (0x1).  More details may be available in 'C:\ProgramData\BOINC\slots\38\boinc_c63ae51e888dcc0e\Logs\VBoxHardening.log'
VBoxManage.exe: error: Details: code E_FAIL (0x80004005), component MachineWrap, interface IMachine
Waiting for VM "boinc_c63ae51e888dcc0e" to power on...

2025-10-10 20:12:41 (20144): VM failed to start.
2025-10-10 20:12:41 (20144): Could not start 
2025-10-10 20:12:41 (20144): ERROR: VM failed to start
2025-10-10 20:12:41 (20144): Powering off VM.
2025-10-10 20:12:41 (20144): Deregistering VM. (boinc_c63ae51e888dcc0e, slot#38)
2025-10-10 20:12:41 (20144): Removing network bandwidth throttle group from VM.
2025-10-10 20:12:41 (20144): Removing VM from VirtualBox.

    Hypervisor System Log:

06:16:15.846757          ERROR [COM]: aRC=VBOX_E_OBJECT_NOT_FOUND (0x80bb0001) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={SessionMachine} aText={No storage device attached to device slot 0 on port 1 of controller 'Hard Disk Controller'}, preserve=false aResultDetail=0
06:16:15.847917          Saving settings file "C:\ProgramData\BOINC\slots\38\boinc_c63ae51e888dcc0e\boinc_c63ae51e888dcc0e.vbox" with version "1.19-windows"
06:16:15.864030          Finished saving settings file "C:\ProgramData\BOINC\slots\38\boinc_c63ae51e888dcc0e\boinc_c63ae51e888dcc0e.vbox"
06:16:15.881392          ERROR [COM]: aRC=VBOX_E_INVALID_VM_STATE (0x80bb0002) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The machine is not mutable (state is PoweredOff)}, preserve=false aResultDetail=0
06:16:16.096343          Saving settings file "C:\ProgramData\BOINC\slots\38\boinc_c63ae51e888dcc0e\boinc_c63ae51e888dcc0e.vbox" with version "1.19-windows"
06:16:16.108543          Finished saving settings file "C:\ProgramData\BOINC\slots\38\boinc_c63ae51e888dcc0e\boinc_c63ae51e888dcc0e.vbox"
06:16:16.124021          ERROR [COM]: aRC=VBOX_E_INVALID_VM_STATE (0x80bb0002) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The machine is not mutable (state is PoweredOff)}, preserve=false aResultDetail=0
06:16:16.357133          Saving settings file "C:\ProgramData\BOINC\slots\38\boinc_c63ae51e888dcc0e\boinc_c63ae51e888dcc0e.vbox" with version "1.19-windows"
06:16:16.371771          Finished saving settings file "C:\ProgramData\BOINC\slots\38\boinc_c63ae51e888dcc0e\boinc_c63ae51e888dcc0e.vbox"
06:16:16.388504          ERROR [COM]: aRC=VBOX_E_INVALID_VM_STATE (0x80bb0002) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The machine is not mutable (state is PoweredOff)}, preserve=false aResultDetail=0
06:16:16.896924          Saving settings file "C:\ProgramData\BOINC\slots\38\boinc_c63ae51e888dcc0e\boinc_c63ae51e888dcc0e.vbox" with version "1.19-windows"
06:16:16.907650          Finished saving settings file "C:\ProgramData\BOINC\slots\38\boinc_c63ae51e888dcc0e\boinc_c63ae51e888dcc0e.vbox"
06:16:16.925003          ERROR [COM]: aRC=VBOX_E_INVALID_VM_STATE (0x80bb0002) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The machine is not mutable (state is PoweredOff)}, preserve=false aResultDetail=0
06:16:17.143939          Saving settings file "C:\ProgramData\BOINC\slots\38\boinc_c63ae51e888dcc0e\boinc_c63ae51e888dcc0e.vbox" with version "1.19-windows"
06:16:17.159567          Finished saving settings file "C:\ProgramData\BOINC\slots\38\boinc_c63ae51e888dcc0e\boinc_c63ae51e888dcc0e.vbox"
06:16:17.176148          ERROR [COM]: aRC=VBOX_E_INVALID_VM_STATE (0x80bb0002) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The machine is not mutable (state is PoweredOff)}, preserve=false aResultDetail=0
06:16:17.397256          ERROR [COM]: aRC=VBOX_E_NOT_SUPPORTED (0x80bb0009) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={SessionMachine} aText={This VM is not encrypted}, preserve=false aResultDetail=0
06:16:17.410054          ERROR [COM]: aRC=VBOX_E_OBJECT_NOT_FOUND (0x80bb0001) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={SessionMachine} aText={No storage device attached to device slot 0 on port 2 of controller 'Hard Disk Controller'}, preserve=false aResultDetail=0
06:16:17.410184          ERROR [COM]: aRC=VBOX_E_OBJECT_NOT_FOUND (0x80bb0001) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={SessionMachine} aText={No storage device attached to device slot 0 on port 2 of controller 'Hard Disk Controller'}, preserve=false aResultDetail=0
06:16:17.415978          ERROR [COM]: aRC=VBOX_E_INVALID_VM_STATE (0x80bb0002) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The machine is not mutable (state is PoweredOff)}, preserve=false aResultDetail=0
06:16:17.577882          ERROR [COM]: aRC=E_FAIL (0x80004005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={SessionMachine} aText={This machine does not have any snapshots}, preserve=false aResultDetail=0
06:16:17.614561          ERROR [COM]: aRC=VBOX_E_INVALID_VM_STATE (0x80bb0002) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The machine is not mutable (state is PoweredOff)}, preserve=false aResultDetail=0
06:16:17.913605          Launched VM: 3356199488 pid: 10344 (0x2868) frontend: headless name: boinc_c63ae51e888dcc0e
06:16:17.931160          ERROR [COM]: aRC=VBOX_E_INVALID_VM_STATE (0x80bb0002) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The machine is not mutable (state is PoweredOff)}, preserve=false aResultDetail=0
06:16:18.360499 Watcher  ERROR [COM]: aRC=E_FAIL (0x80004005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The virtual machine 'boinc_c63ae51e888dcc0e' has terminated unexpectedly during startup with exit code 1 (0x1).  More details may be available in 'C:\ProgramData\BOINC\slots\38\boinc_c63ae51e888dcc0e\Logs\VBoxHardening.log'}, preserve=false aResultDetail=0
06:16:18.361281 Watcher  Reaper: Pid 10344 (0x2868) exited normally: 1 (0x1)
06:16:18.375874          ERROR [COM]: aRC=VBOX_E_INVALID_VM_STATE (0x80bb0002) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The machine is not mutable (state is PoweredOff)}, preserve=false aResultDetail=0
06:16:18.466568          ERROR [COM]: aRC=E_FAIL (0x80004005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={SessionMachine} aText={This machine does not have any snapshots}, preserve=false aResultDetail=0
06:16:18.477174          ERROR [COM]: aRC=VBOX_E_INVALID_VM_STATE (0x80bb0002) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The machine is not mutable (state is PoweredOff)}, preserve=false aResultDetail=0
06:16:18.558122          Saving settings file "C:\ProgramData\BOINC\slots\38\boinc_c63ae51e888dcc0e\boinc_c63ae51e888dcc0e.vbox" with version "1.19-windows"
06:16:18.571479          Finished saving settings file "C:\ProgramData\BOINC\slots\38\boinc_c63ae51e888dcc0e\boinc_c63ae51e888dcc0e.vbox"
06:16:18.589138          ERROR [COM]: aRC=VBOX_E_INVALID_VM_STATE (0x80bb0002) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The machine is not mutable (state is PoweredOff)}, preserve=false aResultDetail=0
06:16:18.839427          Saving settings file "C:\Users\Dad\.VirtualBox\VirtualBox.xml" with version "1.12-windows"
06:16:18.847999          Finished saving settings file "C:\Users\Dad\.VirtualBox\VirtualBox.xml"
06:16:18.848341          Saving settings file "C:\Users\Dad\.VirtualBox\VirtualBox.xml" with version "1.12-windows"
06:16:18.853894          Finished saving settings file "C:\Users\Dad\.VirtualBox\VirtualBox.xml"
06:16:18.855403 DeleteVM Saving settings file "C:\Users\Dad\.VirtualBox\VirtualBox.xml" with version "1.12-windows"
06:16:18.863472 DeleteVM Finished saving settings file "C:\Users\Dad\.VirtualBox\VirtualBox.xml"
06:16:18.864714          Saving settings file "C:\Users\Dad\.VirtualBox\VirtualBox.xml" with version "1.12-windows"
06:16:18.871819          Finished saving settings file "C:\Users\Dad\.VirtualBox\VirtualBox.xml"
06:16:18.890149          ERROR [COM]: aRC=VBOX_E_OBJECT_NOT_FOUND (0x80bb0001) aIID={7682d5eb-f00e-44f1-8ca2-99d08b1cd607} aComponent={VirtualBoxWrap} aText={Could not find a registered machine with UUID {8d77fbf2-fe37-4ce1-9225-5ace7cc408a5}}, preserve=false aResultDetail=0
06:16:18.908673          ERROR [COM]: aRC=VBOX_E_OBJECT_NOT_FOUND (0x80bb0001) aIID={7682d5eb-f00e-44f1-8ca2-99d08b1cd607} aComponent={VirtualBoxWrap} aText={Could not find a registered machine with UUID {8d77fbf2-fe37-4ce1-9225-5ace7cc408a5}}, preserve=false aResultDetail=0
06:16:18.937529          ERROR [COM]: aRC=VBOX_E_INVALID_VM_STATE (0x80bb0002) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The machine is not mutable (state is Running)}, preserve=false aResultDetail=0

    VM Execution Log:


    VM Startup Log:


    VM Trace Log:

f"
audio_in="off"
clipboard="disabled"
draganddrop="disabled"
vrde="off"
usb="off"
ehci="off"
xhci="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\\38\\boinc_c63ae51e888dcc0e\\boinc_c63ae51e888dcc0e-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="GcjKDmhvZR8nsSi4ap6QjLDmwznN0nGgGQJmUXzaDmGVeNDmTxhGPo_1"
GuestMemoryBalloon=0

2025-10-10 20:12:34 (20144): 
Command: VBoxManage -q modifyvm "boinc_c63ae51e888dcc0e" --nic1 nat --nic-type1 "virtio" --cable-connected1 off --nat-dns-proxy1 on 
Exit Code: 0
Output:

2025-10-10 20:12:34 (20144): 
Command: VBoxManage -q modifyvm "boinc_c63ae51e888dcc0e" --cable-connected1 on 
Exit Code: 0
Output:

2025-10-10 20:12:35 (20144): 
Command: VBoxManage -q modifyvm "boinc_c63ae51e888dcc0e" --usb off 
Exit Code: 0
Output:

2025-10-10 20:12:35 (20144): 
Command: VBoxManage -q modifyvm "boinc_c63ae51e888dcc0e" --uart1 off --uart2 off 
Exit Code: 0
Output:

2025-10-10 20:12:35 (20144): 
Command: VBoxManage -q modifyvm "boinc_c63ae51e888dcc0e" --lpt1 off --lpt2 off 
Exit Code: 0
Output:

2025-10-10 20:12:36 (20144): 
Command: VBoxManage -q modifyvm "boinc_c63ae51e888dcc0e" --audio-enabled off 
Exit Code: 0
Output:

2025-10-10 20:12:36 (20144): 
Command: VBoxManage -q modifyvm "boinc_c63ae51e888dcc0e" --clipboard disabled 
Exit Code: 0
Output:

2025-10-10 20:12:36 (20144): 
Command: VBoxManage -q modifyvm "boinc_c63ae51e888dcc0e" --draganddrop disabled 
Exit Code: 0
Output:

2025-10-10 20:12:36 (20144): 
Command: VBoxManage -q storagectl "boinc_c63ae51e888dcc0e" --name "Hard Disk Controller" --add "sata" --controller "IntelAHCI" --hostiocache off --portcount 3
Exit Code: 0
Output:

2025-10-10 20:12:37 (20144): 
Command: VBoxManage -q showhdinfo "C:\ProgramData\BOINC/projects/lhcathome.cern.ch_lhcathome/ATLAS_vbox_3.03_image.vdi" 
Exit Code: 0
Output:
UUID:           3e56213b-898f-4e83-899f-8eb541d45260
Parent UUID:    base
State:          created
Type:           multiattach
Location:       C:\ProgramData\BOINC\projects\lhcathome.cern.ch_lhcathome\ATLAS_vbox_3.03_image.vdi
Storage format: VDI
Format variant: dynamic default
Capacity:       20480 MBytes
Size on disk:   4204 MBytes
Encryption:     disabled
Property:       AllocationBlockSize=1048576

2025-10-10 20:12:37 (20144): 
Command: VBoxManage -q storageattach "boinc_c63ae51e888dcc0e" --storagectl "Hard Disk Controller" --port 0 --device 0 --type hdd --mtype multiattach --medium "C:\ProgramData\BOINC/projects/lhcathome.cern.ch_lhcathome/ATLAS_vbox_3.03_image.vdi" 
Exit Code: -2135228409
Output:
VBoxManage.exe: error: Cannot attach medium 'C:\ProgramData\BOINC\projects\lhcathome.cern.ch_lhcathome\ATLAS_vbox_3.03_image.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 785 of file VBoxManageStorageController.cpp

2025-10-10 20:12:37 (20144): 
Command: VBoxManage -q showhdinfo "C:\ProgramData\BOINC/projects/lhcathome.cern.ch_lhcathome/ATLAS_vbox_3.03_image.vdi" 
Exit Code: 0
Output:
UUID:           3e56213b-898f-4e83-899f-8eb541d45260
Parent UUID:    base
State:          created
Type:           multiattach
Location:       C:\ProgramData\BOINC\projects\lhcathome.cern.ch_lhcathome\ATLAS_vbox_3.03_image.vdi
Storage format: VDI
Format variant: dynamic default
Capacity:       20480 MBytes
Size on disk:   4204 MBytes
Encryption:     disabled
Property:       AllocationBlockSize=1048576

2025-10-10 20:12:37 (20144): 
Command: VBoxManage -q closemedium disk "C:\ProgramData\BOINC\projects\lhcathome.cern.ch_lhcathome\ATLAS_vbox_3.03_image.vdi" 
Exit Code: 0
Output:

2025-10-10 20:12:38 (20144): 
Command: VBoxManage -q showhdinfo "C:\ProgramData\BOINC/projects/lhcathome.cern.ch_lhcathome/ATLAS_vbox_3.03_image.vdi" 
Exit Code: 0
Output:
UUID:           3e56213b-898f-4e83-899f-8eb541d45260
Parent UUID:    base
State:          created
Type:           normal (base)
Location:       C:\ProgramData\BOINC\projects\lhcathome.cern.ch_lhcathome\ATLAS_vbox_3.03_image.vdi
Storage format: VDI
Format variant: dynamic default
Capacity:       20480 MBytes
Size on disk:   4204 MBytes
Encryption:     disabled
Property:       AllocationBlockSize=1048576

2025-10-10 20:12:38 (20144): 
Command: VBoxManage -q storageattach "boinc_c63ae51e888dcc0e" --storagectl "Hard Disk Controller" --port 0 --device 0 --type hdd --medium "C:\ProgramData\BOINC/projects/lhcathome.cern.ch_lhcathome/ATLAS_vbox_3.03_image.vdi" 
Exit Code: 0
Output:

2025-10-10 20:12:38 (20144): 
Command: VBoxManage -q storageattach "boinc_c63ae51e888dcc0e" --storagectl "Hard Disk Controller" --port 0 --device 0 --type hdd --medium none 
Exit Code: 0
Output:

2025-10-10 20:12:38 (20144): 
Command: VBoxManage -q storageattach "boinc_c63ae51e888dcc0e" --storagectl "Hard Disk Controller" --port 0 --device 0 --type hdd --mtype multiattach --medium "C:\ProgramData\BOINC/projects/lhcathome.cern.ch_lhcathome/ATLAS_vbox_3.03_image.vdi" 
Exit Code: 0
Output:

2025-10-10 20:12:39 (20144): 
Command: VBoxManage -q storageattach "boinc_c63ae51e888dcc0e" --storagectl "Hard Disk Controller" --port 1 --device 0 --type dvddrive --medium "C:\Program Files\Oracle\VirtualBox/VBoxGuestAdditions.iso" 
Exit Code: 0
Output:

2025-10-10 20:12:39 (20144): 
Command: VBoxManage -q bandwidthctl "boinc_c63ae51e888dcc0e" add "boinc_c63ae51e888dcc0e_net" --type network --limit 1024G 
Exit Code: 0
Output:

2025-10-10 20:12:39 (20144): 
Command: VBoxManage -q modifyvm "boinc_c63ae51e888dcc0e" --natpf1 ",tcp,127.0.0.1,59403,,80" 
Exit Code: 0
Output:

2025-10-10 20:12:39 (20144): 
Command: VBoxManage -q list extpacks
Exit Code: 0
Output:
Extension Packs: 1
Pack no. 0:   Oracle VM VirtualBox Extension Pack
Version:        7.0.6
Revision:       155176
Edition:        
Description:    Oracle Cloud Infrastructure integration, Host Webcam, VirtualBox RDP, PXE ROM, Disk Encryption, NVMe, full VM encryption.
VRDE Module:    VBoxVRDP
Crypto Module:  VBoxPuelCrypto
Usable:         true
Why unusable:   

2025-10-10 20:12:40 (20144): 
Command: VBoxManage -q modifyvm "boinc_c63ae51e888dcc0e" --vrde on --vrdeextpack default --vrdeauthlibrary default --vrdeauthtype null --vrdeport 59404 --vrde-property "Security/Method=RDP" 
Exit Code: 0
Output:

2025-10-10 20:12:40 (20144): 
Command: VBoxManage -q sharedfolder add "boinc_c63ae51e888dcc0e" --name "shared" --hostpath "C:\ProgramData\BOINC\slots\38/shared"
Exit Code: 0
Output:

2025-10-10 20:12:41 (20144): 
Command: VBoxManage -q startvm "boinc_c63ae51e888dcc0e" --type headless
Exit Code: 1
Output:
VBoxManage.exe: error: The virtual machine 'boinc_c63ae51e888dcc0e' has terminated unexpectedly during startup with exit code 1 (0x1).  More details may be available in 'C:\ProgramData\BOINC\slots\38\boinc_c63ae51e888dcc0e\Logs\VBoxHardening.log'
VBoxManage.exe: error: Details: code E_FAIL (0x80004005), component MachineWrap, interface IMachine
Waiting for VM "boinc_c63ae51e888dcc0e" to power on...

2025-10-10 20:12:41 (20144): 
Command: VBoxManage -q snapshot "boinc_c63ae51e888dcc0e" list 
Exit Code: -108
Output:
This machine does not have any snapshots

2025-10-10 20:12:41 (20144): 
Command: VBoxManage -q bandwidthctl "boinc_c63ae51e888dcc0e" remove "boinc_c63ae51e888dcc0e_net" 
Exit Code: 0
Output:

2025-10-10 20:12:42 (20144): 
Command: VBoxManage -q unregistervm "boinc_c63ae51e888dcc0e" --delete 
Exit Code: 0
Output:
0%...10%...20%...30%...40%...50%...60%...70%...80%...90%...100%

2025-10-10 20:12:52 (20144): called boinc_finish(1)

</stderr_txt>
]]>

©2025 CERN