Stderr output

<core_client_version>8.0.2</core_client_version>
<![CDATA[
<message>
Unbekannter Fehler
 (0x80004005) - exit code 2147500037 (0x80004005)</message>
<stderr_txt>
2025-07-19 11:27:38 (12656): vboxwrapper version 26210
2025-07-19 11:27:38 (12656): BOINC client version: 8.0.2
2025-07-19 11:27:39 (12656): Detected: VirtualBox VboxManage Interface (Version: 7.1.12)
2025-07-19 11:27:39 (12656): Detected: Heartbeat check (file: 'heartbeat' every 1800.000000 seconds)
2025-07-19 11:27:40 (12656): Successfully copied 'init_data.xml' to the shared directory.
2025-07-19 11:27:40 (12656): Successfully copied 'input' to the shared directory.
2025-07-19 11:27:40 (12656): Create VM. (boinc_13be64b7676824f5, slot#2)
2025-07-19 11:27:40 (12656): Setting Memory Size for VM. (630MB)
2025-07-19 11:27:41 (12656): Setting CPU Count for VM. (1)
2025-07-19 11:27:41 (12656): Setting Chipset Options for VM.
2025-07-19 11:27:41 (12656): Setting Graphics Controller Options for VM. (Driver: VBoxVGA, 16MB)
2025-07-19 11:27:42 (12656): Setting Boot Options for VM.
2025-07-19 11:27:42 (12656): Setting Network Configuration for NAT. (Driver: virtio)
2025-07-19 11:27:42 (12656): Enabling VM Network Access.
2025-07-19 11:27:43 (12656): Disabling USB Support for VM.
2025-07-19 11:27:43 (12656): Disabling COM Port Support for VM.
2025-07-19 11:27:43 (12656): Disabling LPT Port Support for VM.
2025-07-19 11:27:44 (12656): Disabling Audio Support for VM.
2025-07-19 11:27:44 (12656): Disabling Clipboard Support for VM.
2025-07-19 11:27:44 (12656): Disabling Drag and Drop Support for VM.
2025-07-19 11:27:45 (12656): Adding storage controller(s) to VM.
2025-07-19 11:27:45 (12656): Adding virtual disk drive to VM. (Theory_2025_07_03_prod.vdi)
2025-07-19 11:27:48 (12656): Attempts: 3
2025-07-19 11:27:49 (12656): Adding VirtualBox Guest Additions to VM.
2025-07-19 11:27:49 (12656): Adding network bandwidth throttle group to VM. (Defaulting to 1024GB)
2025-07-19 11:27:49 (12656): forwarding host port 64647 to guest port 80
2025-07-19 11:27:50 (12656): Enabling remote desktop for VM.
2025-07-19 11:27:50 (12656): Required extension pack not installed, remote desktop not enabled.
2025-07-19 11:27:50 (12656): Enabling shared directory for VM.
2025-07-19 11:27:51 (12656): Starting VM using VBoxManage interface. (boinc_13be64b7676824f5, slot#2)
2025-07-19 11:27:58 (12656): Error in start VM for VM: -2147467259
Command:
VBoxManage -q startvm "boinc_13be64b7676824f5" --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_13be64b7676824f5" to power on...

2025-07-19 11:27:58 (12656): VM failed to start.
2025-07-19 11:27:58 (12656): Could not start 
2025-07-19 11:27:58 (12656): ERROR: VM failed to start
2025-07-19 11:27:58 (12656): Powering off VM.
2025-07-19 11:27:58 (12656): Deregistering VM. (boinc_13be64b7676824f5, slot#2)
2025-07-19 11:27:58 (12656): Removing network bandwidth throttle group from VM.
2025-07-19 11:27:59 (12656): Removing VM from VirtualBox.

    Hypervisor System Log:

00:00:14.739904          ERROR [COM]: aRC=E_FAIL (0x80004005) aIID={bea3ef5c-de2f-4b74-aa3a-15d6249371a0} aComponent={RecordingSettingsWrap} aText={Recording not started}, preserve=false aResultDetail=0
00:00:14.742496          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
00:00:15.035822          Launched VM: 3691289744 pid: 10520 (0x2918) frontend: headless name: boinc_12ae7637b4ff9f1c
00:00:16.228121          Platform architecture set to 'x86'
00:00:17.569474          Platform architecture set to 'x86'
00:00:17.733167          Saving settings file "C:\ProgramData\BOINC\slots\1\boinc_906dcd6b380ddc50\boinc_906dcd6b380ddc50.vbox" with version "1.19-windows"
00:00:17.739258          Finished saving settings file "C:\ProgramData\BOINC\slots\1\boinc_906dcd6b380ddc50\boinc_906dcd6b380ddc50.vbox"
00:00:17.949542          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
00:00:18.253640          Platform architecture set to 'x86'
00:00:18.257808          Saving settings file "C:\ProgramData\BOINC\slots\1\boinc_906dcd6b380ddc50\boinc_906dcd6b380ddc50.vbox" with version "1.19-windows"
00:00:18.264386          Finished saving settings file "C:\ProgramData\BOINC\slots\1\boinc_906dcd6b380ddc50\boinc_906dcd6b380ddc50.vbox"
00:00:18.735892          Saving settings file "C:\Users\Lorant Kupas\.VirtualBox\VirtualBox.xml" with version "1.12-windows"
00:00:18.741354          Finished saving settings file "C:\Users\Lorant Kupas\.VirtualBox\VirtualBox.xml"
00:00:18.741772          Saving settings file "C:\ProgramData\BOINC\slots\3\boinc_32cbe4867b263ba1\boinc_32cbe4867b263ba1.vbox" with version "1.19-windows"
00:00:18.747149          Finished saving settings file "C:\ProgramData\BOINC\slots\3\boinc_32cbe4867b263ba1\boinc_32cbe4867b263ba1.vbox"
00:00:18.763146 DeleteVM Saving settings file "C:\ProgramData\BOINC\slots\3\boinc_32cbe4867b263ba1\boinc_32cbe4867b263ba1.vbox" with version "1.19-windows"
00:00:18.769037 DeleteVM Finished saving settings file "C:\ProgramData\BOINC\slots\3\boinc_32cbe4867b263ba1\boinc_32cbe4867b263ba1.vbox"
00:00:18.863111          Platform architecture set to 'x86'
00:00:19.100715          Saving settings file "C:\ProgramData\BOINC\slots\3\boinc_32cbe4867b263ba1\boinc_32cbe4867b263ba1.vbox" with version "1.19-windows"
00:00:19.106301          Finished saving settings file "C:\ProgramData\BOINC\slots\3\boinc_32cbe4867b263ba1\boinc_32cbe4867b263ba1.vbox"
00:00:19.308192          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
00:00:19.539735          Platform architecture set to 'x86'
00:00:19.542783          Saving settings file "C:\ProgramData\BOINC\slots\3\boinc_32cbe4867b263ba1\boinc_32cbe4867b263ba1.vbox" with version "1.19-windows"
00:00:19.549251          Finished saving settings file "C:\ProgramData\BOINC\slots\3\boinc_32cbe4867b263ba1\boinc_32cbe4867b263ba1.vbox"
00:00:19.791487          Saving settings file "C:\Users\Lorant Kupas\.VirtualBox\VirtualBox.xml" with version "1.12-windows"
00:00:19.795959          Finished saving settings file "C:\Users\Lorant Kupas\.VirtualBox\VirtualBox.xml"
00:00:19.796240          Saving settings file "C:\ProgramData\BOINC\slots\2\boinc_13be64b7676824f5\boinc_13be64b7676824f5.vbox" with version "1.19-windows"
00:00:19.800181          Finished saving settings file "C:\ProgramData\BOINC\slots\2\boinc_13be64b7676824f5\boinc_13be64b7676824f5.vbox"
00:00:19.802276 DeleteVM Saving settings file "C:\ProgramData\BOINC\slots\2\boinc_13be64b7676824f5\boinc_13be64b7676824f5.vbox" with version "1.19-windows"
00:00:19.811370 DeleteVM Finished saving settings file "C:\ProgramData\BOINC\slots\2\boinc_13be64b7676824f5\boinc_13be64b7676824f5.vbox"
00:00:20.214145          Saving settings file "C:\ProgramData\BOINC\slots\2\boinc_13be64b7676824f5\boinc_13be64b7676824f5.vbox" with version "1.19-windows"
00:00:20.218494          Finished saving settings file "C:\ProgramData\BOINC\slots\2\boinc_13be64b7676824f5\boinc_13be64b7676824f5.vbox"
00:00:20.410432          Platform architecture set to 'x86'
00:00:20.412210          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
00:00:20.554930          Platform architecture set to 'x86'
00:00:20.557929          Saving settings file "C:\ProgramData\BOINC\slots\2\boinc_13be64b7676824f5\boinc_13be64b7676824f5.vbox" with version "1.19-windows"
00:00:20.563984          Finished saving settings file "C:\ProgramData\BOINC\slots\2\boinc_13be64b7676824f5\boinc_13be64b7676824f5.vbox"
00:00:20.840401          Saving settings file "C:\Users\Lorant Kupas\.VirtualBox\VirtualBox.xml" with version "1.12-windows"
00:00:20.845250          Finished saving settings file "C:\Users\Lorant Kupas\.VirtualBox\VirtualBox.xml"
00:00:20.845523          Saving settings file "C:\ProgramData\BOINC\slots\0\boinc_12ae7637b4ff9f1c\boinc_12ae7637b4ff9f1c.vbox" with version "1.19-windows"
00:00:20.850283          Finished saving settings file "C:\ProgramData\BOINC\slots\0\boinc_12ae7637b4ff9f1c\boinc_12ae7637b4ff9f1c.vbox"
00:00:20.853064 DeleteVM Saving settings file "C:\ProgramData\BOINC\slots\0\boinc_12ae7637b4ff9f1c\boinc_12ae7637b4ff9f1c.vbox" with version "1.19-windows"
00:00:20.857897 DeleteVM Finished saving settings file "C:\ProgramData\BOINC\slots\0\boinc_12ae7637b4ff9f1c\boinc_12ae7637b4ff9f1c.vbox"
00:00:20.901823          Platform architecture set to 'x86'
00:00:21.819488          Saving settings file "C:\ProgramData\BOINC\slots\0\boinc_12ae7637b4ff9f1c\boinc_12ae7637b4ff9f1c.vbox" with version "1.19-windows"
00:00:21.823640          Finished saving settings file "C:\ProgramData\BOINC\slots\0\boinc_12ae7637b4ff9f1c\boinc_12ae7637b4ff9f1c.vbox"
00:00:21.959694          Platform architecture set to 'x86'
00:00:21.961609          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
00:00:22.092815          Platform architecture set to 'x86'
00:00:22.096439          Saving settings file "C:\ProgramData\BOINC\slots\0\boinc_12ae7637b4ff9f1c\boinc_12ae7637b4ff9f1c.vbox" with version "1.19-windows"
00:00:22.101138          Finished saving settings file "C:\ProgramData\BOINC\slots\0\boinc_12ae7637b4ff9f1c\boinc_12ae7637b4ff9f1c.vbox"
00:00:22.368597          Saving settings file "C:\Users\Lorant Kupas\.VirtualBox\VirtualBox.xml" with version "1.12-windows"
00:00:22.373980          Finished saving settings file "C:\Users\Lorant Kupas\.VirtualBox\VirtualBox.xml"
00:00:22.374147          Saving settings file "C:\Users\Lorant Kupas\.VirtualBox\VirtualBox.xml" with version "1.12-windows"
00:00:22.379608          Finished saving settings file "C:\Users\Lorant Kupas\.VirtualBox\VirtualBox.xml"
00:00:22.381041 DeleteVM Saving settings file "C:\Users\Lorant Kupas\.VirtualBox\VirtualBox.xml" with version "1.12-windows"
00:00:22.386405 DeleteVM Finished saving settings file "C:\Users\Lorant Kupas\.VirtualBox\VirtualBox.xml"
00:00:27.407637 main     VirtualBox: object deletion starts
00:00:27.409814 main     HostDnsMonitor: shutting down ...
00:00:27.409943 main     HostDnsMonitor: shut down
00:00:27.413103 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
00:00:27.413462 main     VirtualBox: object deleted

    VM Execution Log:


    VM Startup Log:


    VM Trace Log:

6824f5' is created and registered.
UUID: a0897736-4562-4e46-9ad7-5188fa380f3d
Settings file: 'C:\ProgramData\BOINC\slots\2\boinc_13be64b7676824f5\boinc_13be64b7676824f5.vbox'

2025-07-19 11:27:40 (12656): 
Command: VBoxManage -q modifyvm "boinc_13be64b7676824f5" --description "Theory_2922-4765750-105_0" 
Exit Code: 0
Output:

2025-07-19 11:27:41 (12656): 
Command: VBoxManage -q modifyvm "boinc_13be64b7676824f5" --memory 630 
Exit Code: 0
Output:

2025-07-19 11:27:41 (12656): 
Command: VBoxManage -q modifyvm "boinc_13be64b7676824f5" --cpus 1 
Exit Code: 0
Output:

2025-07-19 11:27:41 (12656): 
Command: VBoxManage -q modifyvm "boinc_13be64b7676824f5" --acpi on --ioapic on --rtcuseutc off 
Exit Code: 0
Output:

2025-07-19 11:27:42 (12656): 
Command: VBoxManage -q modifyvm "boinc_13be64b7676824f5" --vram 16 --graphicscontroller VBoxVGA 
Exit Code: 0
Output:

2025-07-19 11:27:42 (12656): 
Command: VBoxManage -q modifyvm "boinc_13be64b7676824f5" --boot1 disk --boot2 dvd --boot3 none --boot4 none 
Exit Code: 0
Output:

2025-07-19 11:27:42 (12656): 
Command: VBoxManage -q showvminfo "boinc_13be64b7676824f5" --machinereadable 
Exit Code: 0
Output:
name="boinc_13be64b7676824f5"
encryption="disabled"
groups="/"
platformArchitecture="x86"
ostype="Linux 2.6 / 3.x / 4.x / 5.x (64-bit)"
UUID="a0897736-4562-4e46-9ad7-5188fa380f3d"
CfgFile="C:\\ProgramData\\BOINC\\slots\\2\\boinc_13be64b7676824f5\\boinc_13be64b7676824f5.vbox"
SnapFldr="C:\\ProgramData\\BOINC\\slots\\2\\boinc_13be64b7676824f5\\Snapshots"
LogFldr="C:\\ProgramData\\BOINC\\slots\\2\\boinc_13be64b7676824f5\\Logs"
hardwareuuid="a0897736-4562-4e46-9ad7-5188fa380f3d"
memory=630
pagefusion="off"
vram=16
cpuexecutioncap=100
cpu-profile="host"
chipset="piix3"
firmware="BIOS"
cpus=1
hpet="off"
pae="off"
longmode="on"
triplefaultreset="off"
apic="on"
x2apic="on"
nested-hw-virt="off"
hwvirtex="on"
nestedpaging="on"
largepages="on"
vtxvpid="on"
vtxux="on"
virtvmsavevmload="on"
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\\2\\boinc_13be64b7676824f5\\boinc_13be64b7676824f5.nvram"
rtcuseutc="off"
iommu="none"
paravirtprovider="default"
effparavirtprovider="kvm"
VMState="poweroff"
VMStateChangeTime="2025-07-19T09:27:40.481000000"
graphicscontroller="vboxvga"
monitorcount=1
accelerate3d="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="080027D394B4"
cableconnected1="on"
nic1="nat"
nictype1="82540EM"
nicspeed1="0"
mtu="0"
sockSnd="64"
sockRcv="64"
tcpWndSnd="64"
tcpWndRcv="64"
localhostReachable="0"
forwardBroadcast="0"
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"
clipboard_file_transfers="off"
draganddrop="disabled"
vrde="off"
usb="off"
ehci="off"
xhci="off"
recording_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\\2\\boinc_13be64b7676824f5\\boinc_13be64b7676824f5-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_2922-4765750-105_0"
GuestMemoryBalloon=0

2025-07-19 11:27:42 (12656): 
Command: VBoxManage -q modifyvm "boinc_13be64b7676824f5" --nic1 nat --nic-type1 "virtio" --cable-connected1 off --nat-dns-proxy1 on 
Exit Code: 0
Output:

2025-07-19 11:27:43 (12656): 
Command: VBoxManage -q modifyvm "boinc_13be64b7676824f5" --cable-connected1 on 
Exit Code: 0
Output:

2025-07-19 11:27:43 (12656): 
Command: VBoxManage -q modifyvm "boinc_13be64b7676824f5" --usb off 
Exit Code: 0
Output:

2025-07-19 11:27:43 (12656): 
Command: VBoxManage -q modifyvm "boinc_13be64b7676824f5" --uart1 off --uart2 off 
Exit Code: 0
Output:

2025-07-19 11:27:44 (12656): 
Command: VBoxManage -q modifyvm "boinc_13be64b7676824f5" --lpt1 off --lpt2 off 
Exit Code: 0
Output:

2025-07-19 11:27:44 (12656): 
Command: VBoxManage -q modifyvm "boinc_13be64b7676824f5" --audio-enabled off 
Exit Code: 0
Output:

2025-07-19 11:27:44 (12656): 
Command: VBoxManage -q modifyvm "boinc_13be64b7676824f5" --clipboard disabled 
Exit Code: 0
Output:

2025-07-19 11:27:45 (12656): 
Command: VBoxManage -q modifyvm "boinc_13be64b7676824f5" --draganddrop disabled 
Exit Code: 0
Output:

2025-07-19 11:27:45 (12656): 
Command: VBoxManage -q storagectl "boinc_13be64b7676824f5" --name "Hard Disk Controller" --add "sata" --controller "IntelAHCI" --hostiocache off --portcount 3
Exit Code: 0
Output:

2025-07-19 11:27:49 (12656): 
Command: VBoxManage -q showhdinfo "C:\ProgramData\BOINC/projects/lhcathome.cern.ch_lhcathome/Theory_2025_07_03_prod.vdi" 
Exit Code: 0
Output:
UUID:           93ef7340-8636-46d8-8751-a7cb0c80413d
Parent UUID:    base
State:          created
Type:           multiattach
Location:       C:\ProgramData\BOINC\projects\lhcathome.cern.ch_lhcathome\Theory_2025_07_03_prod.vdi
Storage format: VDI
Format variant: dynamic default
Capacity:       10240 MBytes
Size on disk:   2847 MBytes
Encryption:     disabled
Property:       AllocationBlockSize=1048576
Child UUIDs:    5d23a3ca-71a1-4e49-94df-056d25fbab51
                056206ad-d9aa-448a-b50c-c04279439ea5

2025-07-19 11:27:49 (12656): 
Command: VBoxManage -q storageattach "boinc_13be64b7676824f5" --storagectl "Hard Disk Controller" --port 0 --device 0 --type hdd --mtype multiattach --medium "C:\ProgramData\BOINC/projects/lhcathome.cern.ch_lhcathome/Theory_2025_07_03_prod.vdi" 
Exit Code: 0
Output:

2025-07-19 11:27:49 (12656): 
Command: VBoxManage -q storageattach "boinc_13be64b7676824f5" --storagectl "Hard Disk Controller" --port 1 --device 0 --type dvddrive --medium "C:\Program Files\Oracle\VirtualBox/VBoxGuestAdditions.iso" 
Exit Code: 0
Output:

2025-07-19 11:27:49 (12656): 
Command: VBoxManage -q bandwidthctl "boinc_13be64b7676824f5" add "boinc_13be64b7676824f5_net" --type network --limit 1024G 
Exit Code: 0
Output:

2025-07-19 11:27:50 (12656): 
Command: VBoxManage -q modifyvm "boinc_13be64b7676824f5" --natpf1 ",tcp,127.0.0.1,64647,,80" 
Exit Code: 0
Output:

2025-07-19 11:27:50 (12656): 
Command: VBoxManage -q list extpacks
Exit Code: 0
Output:
Extension Packs: 0

2025-07-19 11:27:50 (12656): 
Command: VBoxManage -q sharedfolder add "boinc_13be64b7676824f5" --name "shared" --hostpath "C:\ProgramData\BOINC\slots\2/shared"
Exit Code: 0
Output:

2025-07-19 11:27:58 (12656): 
Command: VBoxManage -q startvm "boinc_13be64b7676824f5" --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_13be64b7676824f5" to power on...

2025-07-19 11:27:58 (12656): 
Command: VBoxManage -q snapshot "boinc_13be64b7676824f5" list 
Exit Code: -108
Output:
This machine does not have any snapshots

2025-07-19 11:27:59 (12656): 
Command: VBoxManage -q bandwidthctl "boinc_13be64b7676824f5" remove "boinc_13be64b7676824f5_net" 
Exit Code: 0
Output:

2025-07-19 11:27:59 (12656): 
Command: VBoxManage -q unregistervm "boinc_13be64b7676824f5" --delete 
Exit Code: 0
Output:
0%...10%...20%...30%...40%...50%...60%...70%...80%...90%...100%

2025-07-19 11:28:06 (12656): called boinc_finish(-2147467259)

</stderr_txt>
]]>

©2025 CERN