Stderr output

<core_client_version>8.0.2</core_client_version>
<![CDATA[
<message>
Unspecified error
 (0x80004005) - exit code 2147500037 (0x80004005)</message>
<stderr_txt>
2025-05-18 14:36:30 (11708): vboxwrapper version 26210
2025-05-18 14:36:30 (11708): BOINC client version: 8.0.2
2025-05-18 14:36:31 (11708): Detected: VirtualBox VboxManage Interface (Version: 7.0.18)
2025-05-18 14:36:31 (11708): Detected: Heartbeat check (file: 'heartbeat' every 1800.000000 seconds)
2025-05-18 14:36:31 (11708): Successfully copied 'init_data.xml' to the shared directory.
2025-05-18 14:36:31 (11708): Successfully copied 'input' to the shared directory.
2025-05-18 14:36:32 (11708): Create VM. (boinc_074938f6f85952e2, slot#8)
2025-05-18 14:36:33 (11708): Setting Memory Size for VM. (630MB)
2025-05-18 14:36:33 (11708): Setting CPU Count for VM. (1)
2025-05-18 14:36:33 (11708): Setting Chipset Options for VM.
2025-05-18 14:36:34 (11708): Setting Graphics Controller Options for VM. (Driver: VBoxVGA, 16MB)
2025-05-18 14:36:34 (11708): Setting Boot Options for VM.
2025-05-18 14:36:35 (11708): Setting Network Configuration for NAT. (Driver: virtio)
2025-05-18 14:36:35 (11708): Enabling VM Network Access.
2025-05-18 14:36:36 (11708): Disabling USB Support for VM.
2025-05-18 14:36:36 (11708): Disabling COM Port Support for VM.
2025-05-18 14:36:36 (11708): Disabling LPT Port Support for VM.
2025-05-18 14:36:37 (11708): Disabling Audio Support for VM.
2025-05-18 14:36:37 (11708): Disabling Clipboard Support for VM.
2025-05-18 14:36:38 (11708): Disabling Drag and Drop Support for VM.
2025-05-18 14:36:38 (11708): Adding storage controller(s) to VM.
2025-05-18 14:36:38 (11708): Adding virtual disk drive to VM. (Theory_2025_04_17_prod.vdi)
2025-05-18 14:36:42 (11708): Attempts: 3
2025-05-18 14:36:42 (11708): Adding VirtualBox Guest Additions to VM.
2025-05-18 14:36:43 (11708): Adding network bandwidth throttle group to VM. (Defaulting to 1024GB)
2025-05-18 14:36:43 (11708): forwarding host port 64437 to guest port 80
2025-05-18 14:36:43 (11708): Enabling remote desktop for VM.
2025-05-18 14:36:44 (11708): Required extension pack not installed, remote desktop not enabled.
2025-05-18 14:36:44 (11708): Enabling shared directory for VM.
2025-05-18 14:36:44 (11708): Starting VM using VBoxManage interface. (boinc_074938f6f85952e2, slot#8)
2025-05-18 14:36:49 (11708): Error in start VM for VM: -2147467259
Command:
VBoxManage -q startvm "boinc_074938f6f85952e2" --type headless
Output:
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
Waiting for VM "boinc_074938f6f85952e2" to power on...

2025-05-18 14:36:49 (11708): VM failed to start.
2025-05-18 14:36:49 (11708): Could not start 
2025-05-18 14:36:49 (11708): ERROR: VM failed to start
2025-05-18 14:36:49 (11708): Powering off VM.
2025-05-18 14:36:49 (11708): Deregistering VM. (boinc_074938f6f85952e2, slot#8)
2025-05-18 14:36:49 (11708): Removing network bandwidth throttle group from VM.
2025-05-18 14:36:50 (11708): Removing VM from VirtualBox.

    Hypervisor System Log:

00:00:18.027681          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:18.027797          Saving settings file "C:\Users\Owner\.VirtualBox\VirtualBox.xml" with version "1.12-windows"
00:00:18.035808          Finished saving settings file "C:\Users\Owner\.VirtualBox\VirtualBox.xml"
00:00:18.035902          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:18.035928          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:18.035941          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:18.035953          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:18.036365          Saving settings file "C:\ProgramData\BOINC\slots\8\boinc_074938f6f85952e2\boinc_074938f6f85952e2.vbox" with version "1.19-windows"
00:00:18.043010          Finished saving settings file "C:\ProgramData\BOINC\slots\8\boinc_074938f6f85952e2\boinc_074938f6f85952e2.vbox"
00:00:18.045019 DeleteVM ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:18.045081 DeleteVM ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:18.045107 DeleteVM ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:18.045122 DeleteVM ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:18.045702 DeleteVM Saving settings file "C:\ProgramData\BOINC\slots\8\boinc_074938f6f85952e2\boinc_074938f6f85952e2.vbox" with version "1.19-windows"
00:00:18.051128 DeleteVM Finished saving settings file "C:\ProgramData\BOINC\slots\8\boinc_074938f6f85952e2\boinc_074938f6f85952e2.vbox"
00:00:18.807088          Saving settings file "C:\ProgramData\BOINC\slots\8\boinc_074938f6f85952e2\boinc_074938f6f85952e2.vbox" with version "1.19-windows"
00:00:18.811459          Finished saving settings file "C:\ProgramData\BOINC\slots\8\boinc_074938f6f85952e2\boinc_074938f6f85952e2.vbox"
00:00:18.930839          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:18.930866          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:18.930879          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:18.930889          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:18.932650          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
00:00:19.123385          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:19.123428          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:19.123441          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:19.123451          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:19.126235          Saving settings file "C:\ProgramData\BOINC\slots\8\boinc_074938f6f85952e2\boinc_074938f6f85952e2.vbox" with version "1.19-windows"
00:00:19.130874          Finished saving settings file "C:\ProgramData\BOINC\slots\8\boinc_074938f6f85952e2\boinc_074938f6f85952e2.vbox"
00:00:19.448004          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:19.448031          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:19.448045          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:19.448060          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:19.448426          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:19.448446          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:19.448459          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:19.448470          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:19.448566          Saving settings file "C:\Users\Owner\.VirtualBox\VirtualBox.xml" with version "1.12-windows"
00:00:19.455207          Finished saving settings file "C:\Users\Owner\.VirtualBox\VirtualBox.xml"
00:00:19.455614          Saving settings file "C:\Users\Owner\.VirtualBox\VirtualBox.xml" with version "1.12-windows"
00:00:19.461537          Finished saving settings file "C:\Users\Owner\.VirtualBox\VirtualBox.xml"
00:00:19.463823 DeleteVM Saving settings file "C:\Users\Owner\.VirtualBox\VirtualBox.xml" with version "1.12-windows"
00:00:19.470752 DeleteVM Finished saving settings file "C:\Users\Owner\.VirtualBox\VirtualBox.xml"
00:00:24.494304 main     VirtualBox: object deletion starts
00:00:24.497331 main     HostDnsMonitor: shutting down ...
00:00:24.497377 main     HostDnsMonitor: shut down
00:00:24.499712 Watcher  ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={7682d5eb-f00e-44f1-8ca2-99d08b1cd607} aComponent={VirtualBoxWrap} aText={The object is not ready}, preserve=false aResultDetail=0
00:00:24.500185 main     VirtualBox: object deleted

    VM Execution Log:


    VM Startup Log:


    VM Trace Log:

e "boinc_074938f6f85952e2" --basefolder "C:\ProgramData\BOINC\slots\8" --ostype "Linux26_64" --register
Exit Code: 0
Output:
Virtual machine 'boinc_074938f6f85952e2' is created and registered.
UUID: 8ca56c4c-8640-4dda-8c3e-5227b068d335
Settings file: 'C:\ProgramData\BOINC\slots\8\boinc_074938f6f85952e2\boinc_074938f6f85952e2.vbox'

2025-05-18 14:36:33 (11708): 
Command: VBoxManage -q modifyvm "boinc_074938f6f85952e2" --description "Theory_2848-4473589-968_0" 
Exit Code: 0
Output:

2025-05-18 14:36:33 (11708): 
Command: VBoxManage -q modifyvm "boinc_074938f6f85952e2" --memory 630 
Exit Code: 0
Output:

2025-05-18 14:36:33 (11708): 
Command: VBoxManage -q modifyvm "boinc_074938f6f85952e2" --cpus 1 
Exit Code: 0
Output:

2025-05-18 14:36:34 (11708): 
Command: VBoxManage -q modifyvm "boinc_074938f6f85952e2" --acpi on --ioapic on --rtcuseutc off 
Exit Code: 0
Output:

2025-05-18 14:36:34 (11708): 
Command: VBoxManage -q modifyvm "boinc_074938f6f85952e2" --vram 16 --graphicscontroller VBoxVGA 
Exit Code: 0
Output:

2025-05-18 14:36:35 (11708): 
Command: VBoxManage -q modifyvm "boinc_074938f6f85952e2" --boot1 disk --boot2 dvd --boot3 none --boot4 none 
Exit Code: 0
Output:

2025-05-18 14:36:35 (11708): 
Command: VBoxManage -q showvminfo "boinc_074938f6f85952e2" --machinereadable 
Exit Code: 0
Output:
name="boinc_074938f6f85952e2"
encryption="disabled"
groups="/"
ostype="Linux 2.6 / 3.x / 4.x / 5.x (64-bit)"
UUID="8ca56c4c-8640-4dda-8c3e-5227b068d335"
CfgFile="C:\\ProgramData\\BOINC\\slots\\8\\boinc_074938f6f85952e2\\boinc_074938f6f85952e2.vbox"
SnapFldr="C:\\ProgramData\\BOINC\\slots\\8\\boinc_074938f6f85952e2\\Snapshots"
LogFldr="C:\\ProgramData\\BOINC\\slots\\8\\boinc_074938f6f85952e2\\Logs"
hardwareuuid="8ca56c4c-8640-4dda-8c3e-5227b068d335"
memory=630
pagefusion="off"
vram=16
cpuexecutioncap=100
hpet="off"
cpu-profile="host"
chipset="piix3"
firmware="BIOS"
cpus=1
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
NvramFile="C:\\ProgramData\\BOINC\\slots\\8\\boinc_074938f6f85952e2\\boinc_074938f6f85952e2.nvram"
rtcuseutc="off"
hwvirtex="on"
nestedpaging="on"
largepages="on"
vtxvpid="on"
vtxux="on"
virtvmsavevmload="on"
iommu="none"
paravirtprovider="default"
effparavirtprovider="kvm"
VMState="poweroff"
VMStateChangeTime="2025-05-18T20:36:32.429000000"
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="080027F51919"
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="default"
audio_out="off"
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\\8\\boinc_074938f6f85952e2\\boinc_074938f6f85952e2-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_2848-4473589-968_0"
GuestMemoryBalloon=0

2025-05-18 14:36:35 (11708): 
Command: VBoxManage -q modifyvm "boinc_074938f6f85952e2" --nic1 nat --nic-type1 "virtio" --cable-connected1 off --nat-dns-proxy1 on 
Exit Code: 0
Output:

2025-05-18 14:36:36 (11708): 
Command: VBoxManage -q modifyvm "boinc_074938f6f85952e2" --cable-connected1 on 
Exit Code: 0
Output:

2025-05-18 14:36:36 (11708): 
Command: VBoxManage -q modifyvm "boinc_074938f6f85952e2" --usb off 
Exit Code: 0
Output:

2025-05-18 14:36:36 (11708): 
Command: VBoxManage -q modifyvm "boinc_074938f6f85952e2" --uart1 off --uart2 off 
Exit Code: 0
Output:

2025-05-18 14:36:37 (11708): 
Command: VBoxManage -q modifyvm "boinc_074938f6f85952e2" --lpt1 off --lpt2 off 
Exit Code: 0
Output:

2025-05-18 14:36:37 (11708): 
Command: VBoxManage -q modifyvm "boinc_074938f6f85952e2" --audio-enabled off 
Exit Code: 0
Output:

2025-05-18 14:36:38 (11708): 
Command: VBoxManage -q modifyvm "boinc_074938f6f85952e2" --clipboard disabled 
Exit Code: 0
Output:

2025-05-18 14:36:38 (11708): 
Command: VBoxManage -q modifyvm "boinc_074938f6f85952e2" --draganddrop disabled 
Exit Code: 0
Output:

2025-05-18 14:36:38 (11708): 
Command: VBoxManage -q storagectl "boinc_074938f6f85952e2" --name "Hard Disk Controller" --add "sata" --controller "IntelAHCI" --hostiocache off --portcount 3
Exit Code: 0
Output:

2025-05-18 14:36:42 (11708): 
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
Child UUIDs:    ca2f0c07-8f38-4033-9a4e-2b7f976d50aa

2025-05-18 14:36:42 (11708): 
Command: VBoxManage -q storageattach "boinc_074938f6f85952e2" --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:

2025-05-18 14:36:43 (11708): 
Command: VBoxManage -q storageattach "boinc_074938f6f85952e2" --storagectl "Hard Disk Controller" --port 1 --device 0 --type dvddrive --medium "C:\Program Files\Oracle\VirtualBox/VBoxGuestAdditions.iso" 
Exit Code: 0
Output:

2025-05-18 14:36:43 (11708): 
Command: VBoxManage -q bandwidthctl "boinc_074938f6f85952e2" add "boinc_074938f6f85952e2_net" --type network --limit 1024G 
Exit Code: 0
Output:

2025-05-18 14:36:43 (11708): 
Command: VBoxManage -q modifyvm "boinc_074938f6f85952e2" --natpf1 ",tcp,127.0.0.1,64437,,80" 
Exit Code: 0
Output:

2025-05-18 14:36:44 (11708): 
Command: VBoxManage -q list extpacks
Exit Code: 0
Output:
Extension Packs: 0

2025-05-18 14:36:44 (11708): 
Command: VBoxManage -q sharedfolder add "boinc_074938f6f85952e2" --name "shared" --hostpath "C:\ProgramData\BOINC\slots\8/shared"
Exit Code: 0
Output:

2025-05-18 14:36:49 (11708): 
Command: VBoxManage -q startvm "boinc_074938f6f85952e2" --type headless
Exit Code: -2147467259
Output:
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
Waiting for VM "boinc_074938f6f85952e2" to power on...

2025-05-18 14:36:49 (11708): 
Command: VBoxManage -q snapshot "boinc_074938f6f85952e2" list 
Exit Code: -108
Output:
This machine does not have any snapshots

2025-05-18 14:36:50 (11708): 
Command: VBoxManage -q bandwidthctl "boinc_074938f6f85952e2" remove "boinc_074938f6f85952e2_net" 
Exit Code: 0
Output:

2025-05-18 14:36:50 (11708): 
Command: VBoxManage -q unregistervm "boinc_074938f6f85952e2" --delete 
Exit Code: 0
Output:
0%...10%...20%...30%...40%...50%...60%...70%...80%...90%...100%

2025-05-18 14:36:55 (11708): called boinc_finish(-2147467259)

</stderr_txt>
]]>

©2025 CERN