Name ulPKDm3oU66nsSi4ap6QjLDmwznN0nGgGQJmkKkKDmPlvKDmBgvyLm_2
Workunit 230529555
Created 24 Feb 2025, 3:17:49 UTC
Sent 24 Feb 2025, 4:20:22 UTC
Report deadline 4 Mar 2025, 4:20:22 UTC
Received 24 Feb 2025, 5:04:39 UTC
Server state Over
Outcome Computation error
Client state Compute error
Exit status -2147467259 (0x80004005) Unknown error code
Computer ID 10774691
Run time 19 sec
CPU time
Validate state Invalid
Credit 0.00
Device peak FLOPS 40.85 GFLOPS
Application version ATLAS Simulation v3.01 (vbox64_mt_mcore_atlas)
windows_x86_64
Peak working set size 11.72 MB
Peak swap size 6.26 MB
Peak disk usage 325.82 MB

Stderr output

<core_client_version>7.16.20</core_client_version>
<![CDATA[
<message>
Unspecified error
 (0x80004005) - exit code 2147500037 (0x80004005)</message>
<stderr_txt>
2025-02-23 20:21:03 (162820): Detected: vboxwrapper 26206
2025-02-23 20:21:03 (162820): Detected: BOINC client v7.16.20
2025-02-23 20:21:03 (162820): Detected: VirtualBox VboxManage Interface (Version: 6.0.14)
2025-02-23 20:21:04 (162820): Successfully copied 'init_data.xml' to the shared directory.
2025-02-23 20:21:04 (162820): Create VM. (boinc_c665638a048e0df9, slot#13)
2025-02-23 20:21:05 (162820): Setting Memory Size for VM. (4800MB)
2025-02-23 20:21:05 (162820): Setting CPU Count for VM. (8)
2025-02-23 20:21:05 (162820): Setting Chipset Options for VM.
2025-02-23 20:21:05 (162820): Setting Graphics Controller Options for VM.
2025-02-23 20:21:06 (162820): Setting Boot Options for VM.
2025-02-23 20:21:06 (162820): Setting Network Configuration for NAT.
2025-02-23 20:21:06 (162820): Enabling VM Network Access.
2025-02-23 20:21:06 (162820): Disabling USB Support for VM.
2025-02-23 20:21:07 (162820): Disabling COM Port Support for VM.
2025-02-23 20:21:07 (162820): Disabling LPT Port Support for VM.
2025-02-23 20:21:07 (162820): Disabling Audio Support for VM.
2025-02-23 20:21:07 (162820): Disabling Clipboard Support for VM.
2025-02-23 20:21:08 (162820): Disabling Drag and Drop Support for VM.
2025-02-23 20:21:08 (162820): Adding storage controller(s) to VM.
2025-02-23 20:21:08 (162820): Adding virtual disk drive to VM. (ATLAS_vbox_3.01_image.vdi)
2025-02-23 20:21:09 (162820): Adding VirtualBox Guest Additions to VM.
2025-02-23 20:21:10 (162820): Adding network bandwidth throttle group to VM. (Defaulting to 1024GB)
2025-02-23 20:21:10 (162820): forwarding host port 56449 to guest port 80
2025-02-23 20:21:10 (162820): Enabling remote desktop for VM.
2025-02-23 20:21:10 (162820): Required extension pack not installed, remote desktop not enabled.
2025-02-23 20:21:10 (162820): Enabling shared directory for VM.
2025-02-23 20:21:11 (162820): Starting VM using VBoxManage interface. (boinc_c665638a048e0df9, slot#13)
2025-02-23 20:21:14 (162820): Error in start VM for VM: -2147467259
Command:
VBoxManage -q startvm "boinc_c665638a048e0df9" --type headless
Output:
Waiting for VM "boinc_c665638a048e0df9" to power on...
VBoxManage.exe: error: Not in a hypervisor partition (HVP=0) (VERR_NEM_NOT_AVAILABLE).
VBoxManage.exe: error: AMD-V is disabled in the BIOS (or by the host OS) (VERR_SVM_DISABLED)
VBoxManage.exe: error: Details: code E_FAIL (0x80004005), component ConsoleWrap, interface IConsole

2025-02-23 20:21:14 (162820): VM failed to start.
2025-02-23 20:21:14 (162820): Could not start 
2025-02-23 20:21:14 (162820): ERROR: VM failed to start
2025-02-23 20:21:14 (162820): Powering off VM.
2025-02-23 20:21:14 (162820): Deregistering VM. (boinc_c665638a048e0df9, slot#13)
2025-02-23 20:21:14 (162820): Removing network bandwidth throttle group from VM.
2025-02-23 20:21:14 (162820): Removing VM from VirtualBox.

    Hypervisor System Log:

00:00:07.567091          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={5047460a-265d-4538-b23e-ddba5fb84976} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:07.567108          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={5047460a-265d-4538-b23e-ddba5fb84976} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:07.567118          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={5047460a-265d-4538-b23e-ddba5fb84976} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:07.567125          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={5047460a-265d-4538-b23e-ddba5fb84976} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:07.569346          Saving settings file "C:\ProgramData\BOINC\slots\13\boinc_c665638a048e0df9\boinc_c665638a048e0df9.vbox" with version "1.16-windows"
00:00:07.825878          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={5047460a-265d-4538-b23e-ddba5fb84976} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:07.825917          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={5047460a-265d-4538-b23e-ddba5fb84976} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:07.825926          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={5047460a-265d-4538-b23e-ddba5fb84976} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:07.825933          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={5047460a-265d-4538-b23e-ddba5fb84976} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:07.825940          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={5047460a-265d-4538-b23e-ddba5fb84976} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:07.833043          ERROR [COM]: aRC=VBOX_E_OBJECT_NOT_FOUND (0x80bb0001) aIID={5047460a-265d-4538-b23e-ddba5fb84976} aComponent={SessionMachine} aText={No storage device attached to device slot 0 on port 2 of controller 'Hard Disk Controller'}, preserve=false aResultDetail=0
00:00:07.833172          ERROR [COM]: aRC=VBOX_E_OBJECT_NOT_FOUND (0x80bb0001) aIID={5047460a-265d-4538-b23e-ddba5fb84976} aComponent={SessionMachine} aText={No storage device attached to device slot 0 on port 2 of controller 'Hard Disk Controller'}, preserve=false aResultDetail=0
00:00:07.842122          ERROR [COM]: aRC=E_FAIL (0x80004005) aIID={5047460a-265d-4538-b23e-ddba5fb84976} aComponent={SessionMachine} aText={This machine does not have any snapshots}, preserve=false aResultDetail=0
00:00:08.089684          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={5047460a-265d-4538-b23e-ddba5fb84976} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:08.089715          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={5047460a-265d-4538-b23e-ddba5fb84976} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:08.089724          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={5047460a-265d-4538-b23e-ddba5fb84976} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:08.089744          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={5047460a-265d-4538-b23e-ddba5fb84976} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:08.089752          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={5047460a-265d-4538-b23e-ddba5fb84976} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:10.821975          Saving settings file "C:\ProgramData\BOINC\slots\13\boinc_c665638a048e0df9\boinc_c665638a048e0df9.vbox" with version "1.16-windows"
00:00:10.874129          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={5047460a-265d-4538-b23e-ddba5fb84976} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:10.874161          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={5047460a-265d-4538-b23e-ddba5fb84976} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:10.874172          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={5047460a-265d-4538-b23e-ddba5fb84976} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:10.874179          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={5047460a-265d-4538-b23e-ddba5fb84976} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:10.874187          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={5047460a-265d-4538-b23e-ddba5fb84976} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:10.875574          ERROR [COM]: aRC=E_FAIL (0x80004005) aIID={5047460a-265d-4538-b23e-ddba5fb84976} aComponent={SessionMachine} aText={This machine does not have any snapshots}, preserve=false aResultDetail=0
00:00:10.912682          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={5047460a-265d-4538-b23e-ddba5fb84976} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:10.912713          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={5047460a-265d-4538-b23e-ddba5fb84976} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:10.912722          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={5047460a-265d-4538-b23e-ddba5fb84976} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:10.912729          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={5047460a-265d-4538-b23e-ddba5fb84976} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:10.912736          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={5047460a-265d-4538-b23e-ddba5fb84976} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:11.182839          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={5047460a-265d-4538-b23e-ddba5fb84976} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:11.182868          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={5047460a-265d-4538-b23e-ddba5fb84976} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:11.182877          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={5047460a-265d-4538-b23e-ddba5fb84976} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:11.182884          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={5047460a-265d-4538-b23e-ddba5fb84976} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:11.182892          ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={5047460a-265d-4538-b23e-ddba5fb84976} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0
00:00:11.183190          Saving settings file "C:\Users\Carissa Pelley\.VirtualBox\VirtualBox.xml" with version "1.12-windows"
00:00:16.205103 main     VirtualBox: object deletion starts
00:00:16.206951 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
00:00:16.207075 main     VirtualBox: object deleted

    VM Execution Log:


    VM Startup Log:


    VM Trace Log:

re Processor
Processor#1 speed: unknown
Processor#1 description: AMD Ryzen 5 3600 6-Core Processor
Processor#2 speed: unknown
Processor#2 description: AMD Ryzen 5 3600 6-Core Processor
Processor#3 speed: unknown
Processor#3 description: AMD Ryzen 5 3600 6-Core Processor
Processor#4 speed: unknown
Processor#4 description: AMD Ryzen 5 3600 6-Core Processor
Processor#5 speed: unknown
Processor#5 description: AMD Ryzen 5 3600 6-Core Processor
Processor#6 speed: unknown
Processor#6 description: AMD Ryzen 5 3600 6-Core Processor
Processor#7 speed: unknown
Processor#7 description: AMD Ryzen 5 3600 6-Core Processor
Processor#8 speed: unknown
Processor#8 description: AMD Ryzen 5 3600 6-Core Processor
Processor#9 speed: unknown
Processor#9 description: AMD Ryzen 5 3600 6-Core Processor
Processor#10 speed: unknown
Processor#10 description: AMD Ryzen 5 3600 6-Core Processor
Processor#11 speed: unknown
Processor#11 description: AMD Ryzen 5 3600 6-Core Processor
Memory size: 32689 MByte
Memory available: 17370 MByte
Operating system: Windows 10
Operating system version: 10.0.19045

2025-02-23 20:21:04 (162820): 
Command: VBoxManage -q showvminfo "boinc_c665638a048e0df9" --machinereadable 
Exit Code: -2135228415
Output:
VBoxManage.exe: error: Could not find a registered machine named 'boinc_c665638a048e0df9'
VBoxManage.exe: error: Details: code VBOX_E_OBJECT_NOT_FOUND (0x80bb0001), component VirtualBoxWrap, interface IVirtualBox, callee IUnknown
VBoxManage.exe: error: Context: "FindMachine(Bstr(VMNameOrUuid).raw(), machine.asOutParam())" at line 2621 of file VBoxManageInfo.cpp

2025-02-23 20:21:04 (162820): 
Command: VBoxManage -q showhdinfo "C:\ProgramData\BOINC\slots\13/vm_image.vdi" 
Exit Code: -2135228412
Output:
VBoxManage.exe: error: Could not find file for the medium 'C:\ProgramData\BOINC\slots\13\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 191 of file VBoxManageDisk.cpp

2025-02-23 20:21:04 (162820): 
Command: VBoxManage -q createvm --name "boinc_c665638a048e0df9" --basefolder "C:\ProgramData\BOINC\slots\13" --ostype "Linux26_64" --register
Exit Code: 0
Output:
Virtual machine 'boinc_c665638a048e0df9' is created and registered.
UUID: 2790861b-a1e7-4c96-be2d-0c54c956951f
Settings file: 'C:\ProgramData\BOINC\slots\13\boinc_c665638a048e0df9\boinc_c665638a048e0df9.vbox'

2025-02-23 20:21:05 (162820): 
Command: VBoxManage -q modifyvm "boinc_c665638a048e0df9" --description "ulPKDm3oU66nsSi4ap6QjLDmwznN0nGgGQJmkKkKDmPlvKDmBgvyLm_2" 
Exit Code: 0
Output:

2025-02-23 20:21:05 (162820): 
Command: VBoxManage -q modifyvm "boinc_c665638a048e0df9" --memory 4800 
Exit Code: 0
Output:

2025-02-23 20:21:05 (162820): 
Command: VBoxManage -q modifyvm "boinc_c665638a048e0df9" --cpus 8 
Exit Code: 0
Output:

2025-02-23 20:21:05 (162820): 
Command: VBoxManage -q modifyvm "boinc_c665638a048e0df9" --acpi on --ioapic on --rtcuseutc off 
Exit Code: 0
Output:

2025-02-23 20:21:06 (162820): 
Command: VBoxManage -q modifyvm "boinc_c665638a048e0df9" --vram 16 --graphicscontroller VBoxVGA 
Exit Code: 0
Output:

2025-02-23 20:21:06 (162820): 
Command: VBoxManage -q modifyvm "boinc_c665638a048e0df9" --boot1 disk --boot2 dvd --boot3 none --boot4 none 
Exit Code: 0
Output:

2025-02-23 20:21:06 (162820): 
Command: VBoxManage -q modifyvm "boinc_c665638a048e0df9" --nic1 nat --natdnsproxy1 on --cableconnected1 off 
Exit Code: 0
Output:

2025-02-23 20:21:06 (162820): 
Command: VBoxManage -q modifyvm "boinc_c665638a048e0df9" --cableconnected1 on 
Exit Code: 0
Output:

2025-02-23 20:21:07 (162820): 
Command: VBoxManage -q modifyvm "boinc_c665638a048e0df9" --usb off 
Exit Code: 0
Output:

2025-02-23 20:21:07 (162820): 
Command: VBoxManage -q modifyvm "boinc_c665638a048e0df9" --uart1 off --uart2 off 
Exit Code: 0
Output:

2025-02-23 20:21:07 (162820): 
Command: VBoxManage -q modifyvm "boinc_c665638a048e0df9" --lpt1 off --lpt2 off 
Exit Code: 0
Output:

2025-02-23 20:21:07 (162820): 
Command: VBoxManage -q modifyvm "boinc_c665638a048e0df9" --audio none 
Exit Code: 0
Output:

2025-02-23 20:21:08 (162820): 
Command: VBoxManage -q modifyvm "boinc_c665638a048e0df9" --clipboard disabled 
Exit Code: 0
Output:

2025-02-23 20:21:08 (162820): 
Command: VBoxManage -q modifyvm "boinc_c665638a048e0df9" --draganddrop disabled 
Exit Code: 0
Output:

2025-02-23 20:21:08 (162820): 
Command: VBoxManage -q storagectl "boinc_c665638a048e0df9" --name "Hard Disk Controller" --add "sata" --controller "IntelAHCI" --hostiocache off --portcount 3
Exit Code: 0
Output:

2025-02-23 20:21:09 (162820): 
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

2025-02-23 20:21:09 (162820): 
Command: VBoxManage -q storageattach "boinc_c665638a048e0df9" --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:

2025-02-23 20:21:09 (162820): 
Command: VBoxManage -q storageattach "boinc_c665638a048e0df9" --storagectl "Hard Disk Controller" --port 0 --device 0 --type hdd --medium none 
Exit Code: 0
Output:

2025-02-23 20:21:09 (162820): 
Command: VBoxManage -q storageattach "boinc_c665638a048e0df9" --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:

2025-02-23 20:21:10 (162820): 
Command: VBoxManage -q storageattach "boinc_c665638a048e0df9" --storagectl "Hard Disk Controller" --port 1 --device 0 --type dvddrive --medium "C:\Program Files\Oracle\VirtualBox/VBoxGuestAdditions.iso" 
Exit Code: 0
Output:

2025-02-23 20:21:10 (162820): 
Command: VBoxManage -q bandwidthctl "boinc_c665638a048e0df9" add "boinc_c665638a048e0df9_net" --type network --limit 1024G 
Exit Code: 0
Output:

2025-02-23 20:21:10 (162820): 
Command: VBoxManage -q modifyvm "boinc_c665638a048e0df9" --natpf1 ",tcp,127.0.0.1,56449,,80" 
Exit Code: 0
Output:

2025-02-23 20:21:10 (162820): 
Command: VBoxManage -q list extpacks
Exit Code: 0
Output:
Extension Packs: 0

2025-02-23 20:21:11 (162820): 
Command: VBoxManage -q sharedfolder add "boinc_c665638a048e0df9" --name "shared" --hostpath "C:\ProgramData\BOINC\slots\13/shared"
Exit Code: 0
Output:

2025-02-23 20:21:14 (162820): 
Command: VBoxManage -q startvm "boinc_c665638a048e0df9" --type headless
Exit Code: -2147467259
Output:
Waiting for VM "boinc_c665638a048e0df9" to power on...
VBoxManage.exe: error: Not in a hypervisor partition (HVP=0) (VERR_NEM_NOT_AVAILABLE).
VBoxManage.exe: error: AMD-V is disabled in the BIOS (or by the host OS) (VERR_SVM_DISABLED)
VBoxManage.exe: error: Details: code E_FAIL (0x80004005), component ConsoleWrap, interface IConsole

2025-02-23 20:21:14 (162820): 
Command: VBoxManage -q snapshot "boinc_c665638a048e0df9" list 
Exit Code: -108
Output:
This machine does not have any snapshots

2025-02-23 20:21:14 (162820): 
Command: VBoxManage -q bandwidthctl "boinc_c665638a048e0df9" remove "boinc_c665638a048e0df9_net" 
Exit Code: 0
Output:
VBoxManage.exe: error: Bandwidth groups cannot be deleted while the VM is running

2025-02-23 20:21:14 (162820): 
Command: VBoxManage -q unregistervm "boinc_c665638a048e0df9" --delete 
Exit Code: 0
Output:
0%...10%...20%...30%...40%...50%...60%...70%...80%...90%...100%

20:21:19 (162820): called boinc_finish(-2147467259)

</stderr_txt>
]]>


©2025 CERN