Stderr output

<core_client_version>7.16.11</core_client_version>
<![CDATA[
<message>
Unspecified error
 (0x80004005) - exit code 2147500037 (0x80004005)</message>
<stderr_txt>
2025-10-11 09:55:19 (9192): vboxwrapper version 26210
2025-10-11 09:55:19 (9192): BOINC client version: 7.16.11
2025-10-11 09:55:20 (9192): Detected: VirtualBox VboxManage Interface (Version: 6.1.12)
2025-10-11 09:55:20 (9192): Successfully copied 'init_data.xml' to the shared directory.
2025-10-11 09:55:20 (9192): Create VM. (boinc_27b71823c4aa76b2, slot#0)
2025-10-11 09:55:21 (9192): Setting Memory Size for VM. (4800MB)
2025-10-11 09:55:21 (9192): Setting CPU Count for VM. (8)
2025-10-11 09:55:22 (9192): Setting Chipset Options for VM.
2025-10-11 09:55:22 (9192): Setting Graphics Controller Options for VM. (Driver: VBoxVGA, 16MB)
2025-10-11 09:55:22 (9192): Setting Boot Options for VM.
2025-10-11 09:55:23 (9192): Setting Network Configuration for NAT. (Driver: virtio)
2025-10-11 09:55:23 (9192): Enabling VM Network Access.
2025-10-11 09:55:23 (9192): Disabling USB Support for VM.
2025-10-11 09:55:23 (9192): Disabling COM Port Support for VM.
2025-10-11 09:55:24 (9192): Disabling LPT Port Support for VM.
2025-10-11 09:55:24 (9192): Disabling Audio Support for VM.
2025-10-11 09:55:24 (9192): Disabling Clipboard Support for VM.
2025-10-11 09:55:24 (9192): Disabling Drag and Drop Support for VM.
2025-10-11 09:55:25 (9192): Adding storage controller(s) to VM.
2025-10-11 09:55:25 (9192): Adding virtual disk drive to VM. (ATLAS_vbox_3.03_image.vdi)
2025-10-11 09:55:26 (9192): Adding VirtualBox Guest Additions to VM.
2025-10-11 09:55:26 (9192): Adding network bandwidth throttle group to VM. (Defaulting to 1024GB)
2025-10-11 09:55:26 (9192): forwarding host port 51286 to guest port 80
2025-10-11 09:55:27 (9192): Enabling remote desktop for VM.
2025-10-11 09:55:27 (9192): Required extension pack not installed, remote desktop not enabled.
2025-10-11 09:55:27 (9192): Enabling shared directory for VM.
2025-10-11 09:55:28 (9192): Starting VM using VBoxManage interface. (boinc_27b71823c4aa76b2, slot#0)
2025-10-11 09:55:31 (9192): Error in start VM for VM: -2147467259
Command:
VBoxManage -q startvm "boinc_27b71823c4aa76b2" --type headless
Output:
Waiting for VM "boinc_27b71823c4aa76b2" to power on...
VBoxManage.exe: error: Not in a hypervisor partition (HVP=0) (VERR_NEM_NOT_AVAILABLE).
VBoxManage.exe: error: VT-x is disabled in the BIOS for all CPU modes (VERR_VMX_MSR_ALL_VMX_DISABLED)
VBoxManage.exe: error: Details: code E_FAIL (0x80004005), component ConsoleWrap, interface IConsole

2025-10-11 09:55:31 (9192): VM failed to start.
2025-10-11 09:55:31 (9192): Could not start 
2025-10-11 09:55:31 (9192): ERROR: VM failed to start
2025-10-11 09:55:31 (9192): Powering off VM.
2025-10-11 09:55:31 (9192): Deregistering VM. (boinc_27b71823c4aa76b2, slot#0)
2025-10-11 09:55:31 (9192): Removing network bandwidth throttle group from VM.
2025-10-11 09:55:31 (9192): Removing VM from VirtualBox.

    Hypervisor System Log:

00:00:11.435515          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={85632c68-b5bb-4316-a900-5eb28d3413df} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:11.689319          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={85632c68-b5bb-4316-a900-5eb28d3413df} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:11.689341          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={85632c68-b5bb-4316-a900-5eb28d3413df} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:11.689350          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={85632c68-b5bb-4316-a900-5eb28d3413df} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:11.689358          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={85632c68-b5bb-4316-a900-5eb28d3413df} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:11.689365          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={85632c68-b5bb-4316-a900-5eb28d3413df} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:11.689371          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={85632c68-b5bb-4316-a900-5eb28d3413df} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:11.689378          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={85632c68-b5bb-4316-a900-5eb28d3413df} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:11.689385          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={85632c68-b5bb-4316-a900-5eb28d3413df} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:11.689391          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={85632c68-b5bb-4316-a900-5eb28d3413df} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:11.689398          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={85632c68-b5bb-4316-a900-5eb28d3413df} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:11.689405          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={85632c68-b5bb-4316-a900-5eb28d3413df} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:11.689595          ERROR [COM]: aRC=VBOX_E_INVALID_OBJECT_STATE (0x80bb0007) aIID={85632c68-b5bb-4316-a900-5eb28d3413df} aComponent={MachineWrap} aText={Cannot unregister the machine 'boinc_27b71823c4aa76b2' while it is locked}, preserve=false aResultDetail=0
00:00:12.954646          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={85632c68-b5bb-4316-a900-5eb28d3413df} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:12.954670          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={85632c68-b5bb-4316-a900-5eb28d3413df} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:12.954679          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={85632c68-b5bb-4316-a900-5eb28d3413df} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:12.954687          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={85632c68-b5bb-4316-a900-5eb28d3413df} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:12.954694          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={85632c68-b5bb-4316-a900-5eb28d3413df} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:12.954700          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={85632c68-b5bb-4316-a900-5eb28d3413df} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:12.954707          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={85632c68-b5bb-4316-a900-5eb28d3413df} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:12.954714          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={85632c68-b5bb-4316-a900-5eb28d3413df} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:12.954721          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={85632c68-b5bb-4316-a900-5eb28d3413df} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:12.954727          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={85632c68-b5bb-4316-a900-5eb28d3413df} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:12.954734          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={85632c68-b5bb-4316-a900-5eb28d3413df} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:12.954972          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={85632c68-b5bb-4316-a900-5eb28d3413df} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:12.954985          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={85632c68-b5bb-4316-a900-5eb28d3413df} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:12.954992          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={85632c68-b5bb-4316-a900-5eb28d3413df} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:12.954999          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={85632c68-b5bb-4316-a900-5eb28d3413df} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:12.955009          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={85632c68-b5bb-4316-a900-5eb28d3413df} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:12.955016          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={85632c68-b5bb-4316-a900-5eb28d3413df} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:12.955022          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={85632c68-b5bb-4316-a900-5eb28d3413df} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:12.955029          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={85632c68-b5bb-4316-a900-5eb28d3413df} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:12.955038          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={85632c68-b5bb-4316-a900-5eb28d3413df} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:12.955046          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={85632c68-b5bb-4316-a900-5eb28d3413df} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:12.955052          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={85632c68-b5bb-4316-a900-5eb28d3413df} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:12.955093          Saving settings file "C:\Users\svenh\.VirtualBox\VirtualBox.xml" with version "1.12-windows"
00:00:17.991643 main     VirtualBox: object deletion starts
00:00:17.992161 main     HostDnsMonitor: shutting down ...
00:00:17.992244 main     HostDnsMonitor: shut down
00:00:17.994112 Watcher  ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={d0a0163f-e254-4e5b-a1f2-011cf991c38d} aComponent={VirtualBoxWrap} aText={The object is not ready}, preserve=false aResultDetail=0
00:00:17.994286 main     VirtualBox: object deleted

    VM Execution Log:


    VM Startup Log:


    VM Trace Log:

5:22 (9192): 
Command: VBoxManage -q modifyvm "boinc_27b71823c4aa76b2" --cpus 8 
Exit Code: 0
Output:

2025-10-11 09:55:22 (9192): 
Command: VBoxManage -q modifyvm "boinc_27b71823c4aa76b2" --acpi on --ioapic on --rtcuseutc off 
Exit Code: 0
Output:

2025-10-11 09:55:22 (9192): 
Command: VBoxManage -q modifyvm "boinc_27b71823c4aa76b2" --vram 16 --graphicscontroller VBoxVGA 
Exit Code: 0
Output:

2025-10-11 09:55:22 (9192): 
Command: VBoxManage -q modifyvm "boinc_27b71823c4aa76b2" --boot1 disk --boot2 dvd --boot3 none --boot4 none 
Exit Code: 0
Output:

2025-10-11 09:55:23 (9192): 
Command: VBoxManage -q showvminfo "boinc_27b71823c4aa76b2" --machinereadable 
Exit Code: 0
Output:
name="boinc_27b71823c4aa76b2"
groups="/"
ostype="Linux 2.6 / 3.x / 4.x (64-bit)"
UUID="8b5a222d-c5c4-4ded-b99e-d71d8e1572cc"
CfgFile="C:\\ProgramData\\BOINC\\slots\\0\\boinc_27b71823c4aa76b2\\boinc_27b71823c4aa76b2.vbox"
SnapFldr="C:\\ProgramData\\BOINC\\slots\\0\\boinc_27b71823c4aa76b2\\Snapshots"
LogFldr="C:\\ProgramData\\BOINC\\slots\\0\\boinc_27b71823c4aa76b2\\Logs"
hardwareuuid="8b5a222d-c5c4-4ded-b99e-d71d8e1572cc"
memory=4800
pagefusion="off"
vram=16
cpuexecutioncap=100
hpet="off"
cpu-profile="host"
chipset="piix3"
firmware="BIOS"
cpus=8
pae="on"
longmode="on"
triplefaultreset="off"
apic="on"
x2apic="on"
nested-hw-virt="off"
cpuid-portability-level=0
bootmenu="messageandmenu"
boot1="disk"
boot2="dvd"
boot3="none"
boot4="none"
acpi="on"
ioapic="on"
biosapic="apic"
biossystemtimeoffset=0
rtcuseutc="off"
hwvirtex="on"
nestedpaging="on"
largepages="on"
vtxvpid="on"
vtxux="on"
paravirtprovider="default"
effparavirtprovider="kvm"
VMState="poweroff"
VMStateChangeTime="2025-10-11T07:55:21.023000000"
graphicscontroller="vboxvga"
monitorcount=1
accelerate3d="off"
accelerate2dvideo="off"
teleporterenabled="off"
teleporterport=0
teleporteraddress=""
teleporterpassword=""
tracing-enabled="off"
tracing-allow-vm-access="off"
tracing-config=""
autostart-enabled="off"
autostart-delay=0
defaultfrontend=""
vmprocpriority="default"
natnet1="nat"
macaddress1="08002728EEA4"
cableconnected1="on"
nic1="nat"
nictype1="82540EM"
nicspeed1="0"
mtu="0"
sockSnd="64"
sockRcv="64"
tcpWndSnd="64"
tcpWndRcv="64"
nic2="none"
nic3="none"
nic4="none"
nic5="none"
nic6="none"
nic7="none"
nic8="none"
hidpointing="ps2mouse"
hidkeyboard="ps2kbd"
uart1="off"
uart2="off"
uart3="off"
uart4="off"
lpt1="off"
lpt2="off"
audio="dsound"
audio_out="off"
audio_in="off"
clipboard="disabled"
draganddrop="disabled"
vrde="off"
usb="off"
ehci="off"
xhci="off"
videocap="off"
videocapaudio="off"
capturescreens=""
capturefilename="C:\\ProgramData\\BOINC\\slots\\0\\boinc_27b71823c4aa76b2\\boinc_27b71823c4aa76b2.webm"
captureres="1024x768"
capturevideorate=512
capturevideofps=25
captureopts=""
description="65LMDmTreR8n9Rq4apOajLDm4fhM0noT9bVof3QYDm9zQMDmrapzAn_1"
GuestMemoryBalloon=0

2025-10-11 09:55:23 (9192): 
Command: VBoxManage -q modifyvm "boinc_27b71823c4aa76b2" --nic1 nat --nictype1 "virtio" --cableconnected1 off --natdnsproxy1 on 
Exit Code: 0
Output:

2025-10-11 09:55:23 (9192): 
Command: VBoxManage -q modifyvm "boinc_27b71823c4aa76b2" --cableconnected1 on 
Exit Code: 0
Output:

2025-10-11 09:55:23 (9192): 
Command: VBoxManage -q modifyvm "boinc_27b71823c4aa76b2" --usb off 
Exit Code: 0
Output:

2025-10-11 09:55:24 (9192): 
Command: VBoxManage -q modifyvm "boinc_27b71823c4aa76b2" --uart1 off --uart2 off 
Exit Code: 0
Output:

2025-10-11 09:55:24 (9192): 
Command: VBoxManage -q modifyvm "boinc_27b71823c4aa76b2" --lpt1 off --lpt2 off 
Exit Code: 0
Output:

2025-10-11 09:55:24 (9192): 
Command: VBoxManage -q modifyvm "boinc_27b71823c4aa76b2" --audio none 
Exit Code: 0
Output:

2025-10-11 09:55:24 (9192): 
Command: VBoxManage -q modifyvm "boinc_27b71823c4aa76b2" --clipboard disabled 
Exit Code: 0
Output:

2025-10-11 09:55:25 (9192): 
Command: VBoxManage -q modifyvm "boinc_27b71823c4aa76b2" --draganddrop disabled 
Exit Code: 0
Output:

2025-10-11 09:55:25 (9192): 
Command: VBoxManage -q storagectl "boinc_27b71823c4aa76b2" --name "Hard Disk Controller" --add "sata" --controller "IntelAHCI" --hostiocache off --portcount 3
Exit Code: 0
Output:

2025-10-11 09:55:25 (9192): 
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

2025-10-11 09:55:25 (9192): 
Command: VBoxManage -q storageattach "boinc_27b71823c4aa76b2" --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:

2025-10-11 09:55:26 (9192): 
Command: VBoxManage -q storageattach "boinc_27b71823c4aa76b2" --storagectl "Hard Disk Controller" --port 0 --device 0 --type hdd --medium none 
Exit Code: 0
Output:

2025-10-11 09:55:26 (9192): 
Command: VBoxManage -q storageattach "boinc_27b71823c4aa76b2" --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:

2025-10-11 09:55:26 (9192): 
Command: VBoxManage -q storageattach "boinc_27b71823c4aa76b2" --storagectl "Hard Disk Controller" --port 1 --device 0 --type dvddrive --medium "C:\Program Files\Oracle\VirtualBox/VBoxGuestAdditions.iso" 
Exit Code: 0
Output:

2025-10-11 09:55:26 (9192): 
Command: VBoxManage -q bandwidthctl "boinc_27b71823c4aa76b2" add "boinc_27b71823c4aa76b2_net" --type network --limit 1024G 
Exit Code: 0
Output:

2025-10-11 09:55:27 (9192): 
Command: VBoxManage -q modifyvm "boinc_27b71823c4aa76b2" --natpf1 ",tcp,127.0.0.1,51286,,80" 
Exit Code: 0
Output:

2025-10-11 09:55:27 (9192): 
Command: VBoxManage -q list extpacks
Exit Code: 0
Output:
Extension Packs: 0

2025-10-11 09:55:27 (9192): 
Command: VBoxManage -q sharedfolder add "boinc_27b71823c4aa76b2" --name "shared" --hostpath "C:\ProgramData\BOINC\slots\0/shared"
Exit Code: 0
Output:

2025-10-11 09:55:31 (9192): 
Command: VBoxManage -q startvm "boinc_27b71823c4aa76b2" --type headless
Exit Code: -2147467259
Output:
Waiting for VM "boinc_27b71823c4aa76b2" to power on...
VBoxManage.exe: error: Not in a hypervisor partition (HVP=0) (VERR_NEM_NOT_AVAILABLE).
VBoxManage.exe: error: VT-x is disabled in the BIOS for all CPU modes (VERR_VMX_MSR_ALL_VMX_DISABLED)
VBoxManage.exe: error: Details: code E_FAIL (0x80004005), component ConsoleWrap, interface IConsole

2025-10-11 09:55:31 (9192): 
Command: VBoxManage -q snapshot "boinc_27b71823c4aa76b2" list 
Exit Code: -108
Output:
This machine does not have any snapshots

2025-10-11 09:55:31 (9192): 
Command: VBoxManage -q bandwidthctl "boinc_27b71823c4aa76b2" remove "boinc_27b71823c4aa76b2_net" 
Exit Code: 0
Output:
VBoxManage.exe: error: Bandwidth groups cannot be deleted while the VM is running

2025-10-11 09:55:31 (9192): 
Command: VBoxManage -q unregistervm "boinc_27b71823c4aa76b2" --delete 
Exit Code: -2135228409
Output:
VBoxManage.exe: error: Cannot unregister the machine 'boinc_27b71823c4aa76b2' while it is locked
VBoxManage.exe: error: Details: code VBOX_E_INVALID_OBJECT_STATE (0x80bb0007), component MachineWrap, interface IMachine, callee IUnknown
VBoxManage.exe: error: Context: "Unregister(CleanupMode_DetachAllReturnHardDisksOnly, ComSafeArrayAsOutParam(aMedia))" at line 154 of file VBoxManageMisc.cpp

2025-10-11 09:55:33 (9192): 
Command: VBoxManage -q unregistervm "boinc_27b71823c4aa76b2" --delete 
Exit Code: 0
Output:
0%...10%...20%...30%...40%...50%...60%...70%...80%...90%...100%

2025-10-11 09:55:38 (9192): called boinc_finish(-2147467259)

</stderr_txt>
]]>

©2025 CERN