Stderr output

<core_client_version>7.24.1</core_client_version>
<![CDATA[
<message>
Incorrect function.
 (0x1) - exit code 1 (0x1)</message>
<stderr_txt>
2025-04-02 11:11:57 (2676): Detected: vboxwrapper 26206
2025-04-02 11:11:57 (2676): Detected: BOINC client v7.24.1
2025-04-02 11:11:59 (2676): Detected: VirtualBox VboxManage Interface (Version: 7.1.6)
2025-04-02 11:12:00 (2676): Successfully copied 'init_data.xml' to the shared directory.
2025-04-02 11:12:00 (2676): Create VM. (boinc_b6b4bb54b7bd3144, slot#0)
2025-04-02 11:12:01 (2676): Setting Memory Size for VM. (4400MB)
2025-04-02 11:12:01 (2676): Setting CPU Count for VM. (4)
2025-04-02 11:12:01 (2676): Setting Chipset Options for VM.
2025-04-02 11:12:02 (2676): Setting Graphics Controller Options for VM.
2025-04-02 11:12:02 (2676): Setting Boot Options for VM.
2025-04-02 11:12:02 (2676): Setting Network Configuration for NAT.
2025-04-02 11:12:03 (2676): Enabling VM Network Access.
2025-04-02 11:12:03 (2676): Disabling USB Support for VM.
2025-04-02 11:12:03 (2676): Disabling COM Port Support for VM.
2025-04-02 11:12:04 (2676): Disabling LPT Port Support for VM.
2025-04-02 11:12:04 (2676): Disabling Audio Support for VM.
2025-04-02 11:12:04 (2676): Disabling Clipboard Support for VM.
2025-04-02 11:12:05 (2676): Disabling Drag and Drop Support for VM.
2025-04-02 11:12:05 (2676): Adding storage controller(s) to VM.
2025-04-02 11:12:05 (2676): Adding virtual disk drive to VM. (ATLAS_vbox_3.01_image.vdi)
2025-04-02 11:12:08 (2676): Adding VirtualBox Guest Additions to VM.
2025-04-02 11:12:08 (2676): Adding network bandwidth throttle group to VM. (Defaulting to 1024GB)
2025-04-02 11:12:09 (2676): forwarding host port 49581 to guest port 80
2025-04-02 11:12:09 (2676): Enabling remote desktop for VM.
2025-04-02 11:12:09 (2676): Required extension pack not installed, remote desktop not enabled.
2025-04-02 11:12:09 (2676): Enabling shared directory for VM.
2025-04-02 11:12:10 (2676): Starting VM using VBoxManage interface. (boinc_b6b4bb54b7bd3144, slot#0)
2025-04-02 11:12:11 (2676): Error in start VM for VM: 1
Command:
VBoxManage -q startvm "boinc_b6b4bb54b7bd3144" --type headless
Output:
VBoxManage.exe: error: The virtual machine 'boinc_b6b4bb54b7bd3144' has terminated unexpectedly during startup with exit code 1 (0x1).  More details may be available in 'C:\ProgramData\BOINC\slots\0\boinc_b6b4bb54b7bd3144\Logs\VBoxHardening.log'
VBoxManage.exe: error: Details: code E_FAIL (0x80004005), component MachineWrap, interface IMachine
Waiting for VM "boinc_b6b4bb54b7bd3144" to power on...

2025-04-02 11:12:11 (2676): VM failed to start.
2025-04-02 11:12:11 (2676): Could not start 
2025-04-02 11:12:11 (2676): ERROR: VM failed to start
2025-04-02 11:12:11 (2676): Powering off VM.
2025-04-02 11:12:11 (2676): Deregistering VM. (boinc_b6b4bb54b7bd3144, slot#0)
2025-04-02 11:12:11 (2676): Removing network bandwidth throttle group from VM.
2025-04-02 11:12:12 (2676): Removing VM from VirtualBox.

    Hypervisor System Log:

00:00:13.999402          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={e36a5081-a82a-40bd-9e4e-42a44d6ce50f} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:13.999424          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={e36a5081-a82a-40bd-9e4e-42a44d6ce50f} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:13.999446          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={e36a5081-a82a-40bd-9e4e-42a44d6ce50f} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:13.999468          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={e36a5081-a82a-40bd-9e4e-42a44d6ce50f} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:13.999492          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={e36a5081-a82a-40bd-9e4e-42a44d6ce50f} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:13.999515          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={e36a5081-a82a-40bd-9e4e-42a44d6ce50f} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:13.999534          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={e36a5081-a82a-40bd-9e4e-42a44d6ce50f} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:13.999552          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={e36a5081-a82a-40bd-9e4e-42a44d6ce50f} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:13.999571          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={e36a5081-a82a-40bd-9e4e-42a44d6ce50f} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:13.999589          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={e36a5081-a82a-40bd-9e4e-42a44d6ce50f} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:13.999607          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={e36a5081-a82a-40bd-9e4e-42a44d6ce50f} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:13.999628          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={e36a5081-a82a-40bd-9e4e-42a44d6ce50f} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:13.999648          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={e36a5081-a82a-40bd-9e4e-42a44d6ce50f} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:13.999666          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={e36a5081-a82a-40bd-9e4e-42a44d6ce50f} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:13.999684          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={e36a5081-a82a-40bd-9e4e-42a44d6ce50f} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:13.999702          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={e36a5081-a82a-40bd-9e4e-42a44d6ce50f} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:13.999720          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={e36a5081-a82a-40bd-9e4e-42a44d6ce50f} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:13.999737          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={e36a5081-a82a-40bd-9e4e-42a44d6ce50f} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:13.999758          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={e36a5081-a82a-40bd-9e4e-42a44d6ce50f} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:13.999776          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={e36a5081-a82a-40bd-9e4e-42a44d6ce50f} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:13.999794          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={e36a5081-a82a-40bd-9e4e-42a44d6ce50f} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:13.999811          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={e36a5081-a82a-40bd-9e4e-42a44d6ce50f} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:13.999829          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={e36a5081-a82a-40bd-9e4e-42a44d6ce50f} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:13.999847          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={e36a5081-a82a-40bd-9e4e-42a44d6ce50f} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:13.999865          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={e36a5081-a82a-40bd-9e4e-42a44d6ce50f} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:13.999883          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={e36a5081-a82a-40bd-9e4e-42a44d6ce50f} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:13.999901          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={e36a5081-a82a-40bd-9e4e-42a44d6ce50f} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:13.999919          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={e36a5081-a82a-40bd-9e4e-42a44d6ce50f} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:13.999937          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={e36a5081-a82a-40bd-9e4e-42a44d6ce50f} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:13.999954          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={e36a5081-a82a-40bd-9e4e-42a44d6ce50f} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:13.999975          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={e36a5081-a82a-40bd-9e4e-42a44d6ce50f} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:13.999994          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={e36a5081-a82a-40bd-9e4e-42a44d6ce50f} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:14.000881          Saving settings file "C:\Users\Dan\.VirtualBox\VirtualBox.xml" with version "1.12-windows"
00:00:14.010130          Finished saving settings file "C:\Users\Dan\.VirtualBox\VirtualBox.xml"
00:00:14.011128          Saving settings file "C:\Users\Dan\.VirtualBox\VirtualBox.xml" with version "1.12-windows"
00:00:14.017620          Finished saving settings file "C:\Users\Dan\.VirtualBox\VirtualBox.xml"
00:00:14.020580 DeleteVM Saving settings file "C:\Users\Dan\.VirtualBox\VirtualBox.xml" with version "1.12-windows"
00:00:14.027729 DeleteVM Finished saving settings file "C:\Users\Dan\.VirtualBox\VirtualBox.xml"
00:00:19.044852 main     VirtualBox: object deletion starts
00:00:19.056334 main     HostDnsMonitor: shutting down ...
00:00:19.056434 main     HostDnsMonitor: shut down
00:00:19.059550 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
00:00:19.060068 main     VirtualBox: object deleted

    VM Execution Log:


    VM Startup Log:


    VM Trace Log:

age -q showhdinfo "C:\ProgramData\BOINC\slots\0/vm_image.vdi" 
Exit Code: -2135228412
Output:
VBoxManage.exe: error: Could not find file for the medium 'C:\ProgramData\BOINC\slots\0\vm_image.vdi' (VERR_FILE_NOT_FOUND)
VBoxManage.exe: error: Details: code VBOX_E_FILE_ERROR (0x80bb0004), component MediumWrap, interface IMedium, callee IUnknown
VBoxManage.exe: error: Context: "OpenMedium(Bstr(pszFilenameOrUuid).raw(), enmDevType, enmAccessMode, fForceNewUuidOnOpen, pMedium.asOutParam())" at line 201 of file VBoxManageDisk.cpp

2025-04-02 11:12:00 (2676): 
Command: VBoxManage -q createvm --name "boinc_b6b4bb54b7bd3144" --basefolder "C:\ProgramData\BOINC\slots\0" --ostype "Linux26_64" --register
Exit Code: 0
Output:
Virtual machine 'boinc_b6b4bb54b7bd3144' is created and registered.
UUID: db47670c-6dfb-41ca-a8cd-bfd7405450ba
Settings file: 'C:\ProgramData\BOINC\slots\0\boinc_b6b4bb54b7bd3144\boinc_b6b4bb54b7bd3144.vbox'

2025-04-02 11:12:01 (2676): 
Command: VBoxManage -q modifyvm "boinc_b6b4bb54b7bd3144" --description "vgaNDmS55J7n9Rq4apOajLDm4fhM0noT9bVoFjIUDmNlrKDmg00ORm_0" 
Exit Code: 0
Output:

2025-04-02 11:12:01 (2676): 
Command: VBoxManage -q modifyvm "boinc_b6b4bb54b7bd3144" --memory 4400 
Exit Code: 0
Output:

2025-04-02 11:12:01 (2676): 
Command: VBoxManage -q modifyvm "boinc_b6b4bb54b7bd3144" --cpus 4 
Exit Code: 0
Output:

2025-04-02 11:12:02 (2676): 
Command: VBoxManage -q modifyvm "boinc_b6b4bb54b7bd3144" --acpi on --ioapic on --rtcuseutc off 
Exit Code: 0
Output:

2025-04-02 11:12:02 (2676): 
Command: VBoxManage -q modifyvm "boinc_b6b4bb54b7bd3144" --vram 16 --graphicscontroller VBoxVGA 
Exit Code: 0
Output:

2025-04-02 11:12:02 (2676): 
Command: VBoxManage -q modifyvm "boinc_b6b4bb54b7bd3144" --boot1 disk --boot2 dvd --boot3 none --boot4 none 
Exit Code: 0
Output:

2025-04-02 11:12:03 (2676): 
Command: VBoxManage -q modifyvm "boinc_b6b4bb54b7bd3144" --nic1 nat --natdnsproxy1 on --cableconnected1 off 
Exit Code: 0
Output:

2025-04-02 11:12:03 (2676): 
Command: VBoxManage -q modifyvm "boinc_b6b4bb54b7bd3144" --cableconnected1 on 
Exit Code: 0
Output:

2025-04-02 11:12:03 (2676): 
Command: VBoxManage -q modifyvm "boinc_b6b4bb54b7bd3144" --usb off 
Exit Code: 0
Output:

2025-04-02 11:12:04 (2676): 
Command: VBoxManage -q modifyvm "boinc_b6b4bb54b7bd3144" --uart1 off --uart2 off 
Exit Code: 0
Output:

2025-04-02 11:12:04 (2676): 
Command: VBoxManage -q modifyvm "boinc_b6b4bb54b7bd3144" --lpt1 off --lpt2 off 
Exit Code: 0
Output:

2025-04-02 11:12:04 (2676): 
Command: VBoxManage -q modifyvm "boinc_b6b4bb54b7bd3144" --audio none 
Exit Code: 0
Output:
Warning: --audio is deprecated and will be removed soon. Use --audio-driver instead!

2025-04-02 11:12:05 (2676): 
Command: VBoxManage -q modifyvm "boinc_b6b4bb54b7bd3144" --clipboard disabled 
Exit Code: 0
Output:

2025-04-02 11:12:05 (2676): 
Command: VBoxManage -q modifyvm "boinc_b6b4bb54b7bd3144" --draganddrop disabled 
Exit Code: 0
Output:

2025-04-02 11:12:05 (2676): 
Command: VBoxManage -q storagectl "boinc_b6b4bb54b7bd3144" --name "Hard Disk Controller" --add "sata" --controller "IntelAHCI" --hostiocache off --portcount 3
Exit Code: 0
Output:

2025-04-02 11:12:05 (2676): 
Command: VBoxManage -q showhdinfo "C:\ProgramData\BOINC/projects/lhcathome.cern.ch_lhcathome/ATLAS_vbox_3.01_image.vdi" 
Exit Code: 0
Output:
UUID:           ba4f7346-8ee8-4da6-a071-5ab41c7f9cb8
Parent UUID:    base
State:          created
Type:           multiattach
Location:       C:\ProgramData\BOINC\projects\lhcathome.cern.ch_lhcathome\ATLAS_vbox_3.01_image.vdi
Storage format: VDI
Format variant: dynamic default
Capacity:       20480 MBytes
Size on disk:   4204 MBytes
Encryption:     disabled
Property:       AllocationBlockSize=1048576

2025-04-02 11:12:06 (2676): 
Command: VBoxManage -q storageattach "boinc_b6b4bb54b7bd3144" --storagectl "Hard Disk Controller" --port 0 --device 0 --type hdd --mtype multiattach --medium "C:\ProgramData\BOINC/projects/lhcathome.cern.ch_lhcathome/ATLAS_vbox_3.01_image.vdi" 
Exit Code: -2135228409
Output:
VBoxManage.exe: error: Cannot attach medium 'C:\ProgramData\BOINC\projects\lhcathome.cern.ch_lhcathome\ATLAS_vbox_3.01_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 786 of file VBoxManageStorageController.cpp

2025-04-02 11:12:06 (2676): 
Command: VBoxManage -q closemedium "C:\ProgramData\BOINC/projects/lhcathome.cern.ch_lhcathome/ATLAS_vbox_3.01_image.vdi" 
Exit Code: 0
Output:

2025-04-02 11:12:07 (2676): 
Command: VBoxManage -q showhdinfo "C:\ProgramData\BOINC/projects/lhcathome.cern.ch_lhcathome/ATLAS_vbox_3.01_image.vdi" 
Exit Code: 0
Output:
UUID:           ba4f7346-8ee8-4da6-a071-5ab41c7f9cb8
Parent UUID:    base
State:          created
Type:           normal (base)
Location:       C:\ProgramData\BOINC\projects\lhcathome.cern.ch_lhcathome\ATLAS_vbox_3.01_image.vdi
Storage format: VDI
Format variant: dynamic default
Capacity:       20480 MBytes
Size on disk:   4204 MBytes
Encryption:     disabled
Property:       AllocationBlockSize=1048576

2025-04-02 11:12:08 (2676): 
Command: VBoxManage -q storageattach "boinc_b6b4bb54b7bd3144" --storagectl "Hard Disk Controller" --port 0 --device 0 --type hdd --medium "C:\ProgramData\BOINC/projects/lhcathome.cern.ch_lhcathome/ATLAS_vbox_3.01_image.vdi" 
Exit Code: 0
Output:

2025-04-02 11:12:08 (2676): 
Command: VBoxManage -q storageattach "boinc_b6b4bb54b7bd3144" --storagectl "Hard Disk Controller" --port 0 --device 0 --type hdd --medium none 
Exit Code: 0
Output:

2025-04-02 11:12:08 (2676): 
Command: VBoxManage -q storageattach "boinc_b6b4bb54b7bd3144" --storagectl "Hard Disk Controller" --port 0 --device 0 --type hdd --mtype multiattach --medium "C:\ProgramData\BOINC/projects/lhcathome.cern.ch_lhcathome/ATLAS_vbox_3.01_image.vdi" 
Exit Code: 0
Output:

2025-04-02 11:12:08 (2676): 
Command: VBoxManage -q storageattach "boinc_b6b4bb54b7bd3144" --storagectl "Hard Disk Controller" --port 1 --device 0 --type dvddrive --medium "C:\Program Files\Oracle\VirtualBox/VBoxGuestAdditions.iso" 
Exit Code: 0
Output:

2025-04-02 11:12:09 (2676): 
Command: VBoxManage -q bandwidthctl "boinc_b6b4bb54b7bd3144" add "boinc_b6b4bb54b7bd3144_net" --type network --limit 1024G 
Exit Code: 0
Output:

2025-04-02 11:12:09 (2676): 
Command: VBoxManage -q modifyvm "boinc_b6b4bb54b7bd3144" --natpf1 ",tcp,127.0.0.1,49581,,80" 
Exit Code: 0
Output:

2025-04-02 11:12:09 (2676): 
Command: VBoxManage -q list extpacks
Exit Code: 0
Output:
Extension Packs: 0

2025-04-02 11:12:10 (2676): 
Command: VBoxManage -q sharedfolder add "boinc_b6b4bb54b7bd3144" --name "shared" --hostpath "C:\ProgramData\BOINC\slots\0/shared"
Exit Code: 0
Output:

2025-04-02 11:12:11 (2676): 
Command: VBoxManage -q startvm "boinc_b6b4bb54b7bd3144" --type headless
Exit Code: 1
Output:
VBoxManage.exe: error: The virtual machine 'boinc_b6b4bb54b7bd3144' has terminated unexpectedly during startup with exit code 1 (0x1).  More details may be available in 'C:\ProgramData\BOINC\slots\0\boinc_b6b4bb54b7bd3144\Logs\VBoxHardening.log'
VBoxManage.exe: error: Details: code E_FAIL (0x80004005), component MachineWrap, interface IMachine
Waiting for VM "boinc_b6b4bb54b7bd3144" to power on...

2025-04-02 11:12:11 (2676): 
Command: VBoxManage -q snapshot "boinc_b6b4bb54b7bd3144" list 
Exit Code: -108
Output:
This machine does not have any snapshots

2025-04-02 11:12:12 (2676): 
Command: VBoxManage -q bandwidthctl "boinc_b6b4bb54b7bd3144" remove "boinc_b6b4bb54b7bd3144_net" 
Exit Code: 0
Output:

2025-04-02 11:12:12 (2676): 
Command: VBoxManage -q unregistervm "boinc_b6b4bb54b7bd3144" --delete 
Exit Code: 0
Output:
0%...10%...20%...30%...40%...50%...60%...70%...80%...90%...100%

11:12:17 (2676): called boinc_finish(1)

</stderr_txt>
]]>

©2025 CERN