Name | CMS_3655718_1749318366.537717_0 |
Workunit | 232922500 |
Created | 7 Jun 2025, 17:46:08 UTC |
Sent | 7 Jun 2025, 18:16:13 UTC |
Report deadline | 8 Jul 2025, 18:16:13 UTC |
Received | 7 Jun 2025, 18:41:35 UTC |
Server state | Over |
Outcome | Computation error |
Client state | Compute error |
Exit status | -2147467259 (0x80004005) Unknown error code |
Computer ID | 10594036 |
Run time | 23 sec |
CPU time | |
Validate state | Invalid |
Credit | 0.00 |
Device peak FLOPS | 24.22 GFLOPS |
Application version | CMS Simulation v70.91 (vbox64_mt_mcore_cms) windows_x86_64 |
Peak working set size | 11.21 MB |
Peak swap size | 6.26 MB |
Peak disk usage | 0.77 MB |
<core_client_version>8.0.2</core_client_version> <![CDATA[ <message> Nespecifikovan� chyba (0x80004005) - exit code 2147500037 (0x80004005)</message> <stderr_txt> 2025-06-07 20:34:03 (5784): vboxwrapper version 26210 2025-06-07 20:34:03 (5784): BOINC client version: 8.0.2 2025-06-07 20:34:04 (5784): Detected: VirtualBox VboxManage Interface (Version: 7.0.6) 2025-06-07 20:34:04 (5784): Detected: Heartbeat check (file: 'heartbeat' every 1200.000000 seconds) 2025-06-07 20:34:04 (5784): Successfully copied 'init_data.xml' to the shared directory. 2025-06-07 20:34:04 (5784): Create VM. (boinc_809a4a7dca5ce0f8, slot#6) 2025-06-07 20:34:05 (5784): Setting Memory Size for VM. (4584MB) 2025-06-07 20:34:05 (5784): Setting CPU Count for VM. (4) 2025-06-07 20:34:05 (5784): Setting Chipset Options for VM. 2025-06-07 20:34:06 (5784): Setting Graphics Controller Options for VM. (Driver: VBoxVGA, 16MB) 2025-06-07 20:34:06 (5784): Setting Boot Options for VM. 2025-06-07 20:34:06 (5784): Setting Network Configuration for NAT. (Driver: virtio) 2025-06-07 20:34:07 (5784): Enabling VM Network Access. 2025-06-07 20:34:07 (5784): Disabling USB Support for VM. 2025-06-07 20:34:07 (5784): Disabling COM Port Support for VM. 2025-06-07 20:34:08 (5784): Disabling LPT Port Support for VM. 2025-06-07 20:34:08 (5784): Disabling Audio Support for VM. 2025-06-07 20:34:08 (5784): Disabling Clipboard Support for VM. 2025-06-07 20:34:08 (5784): Disabling Drag and Drop Support for VM. 2025-06-07 20:34:09 (5784): Adding storage controller(s) to VM. 2025-06-07 20:34:09 (5784): Adding virtual disk drive to VM. (CMS_2025_04_08_prod.vdi) 2025-06-07 20:34:11 (5784): Adding VirtualBox Guest Additions to VM. 2025-06-07 20:34:12 (5784): Adding network bandwidth throttle group to VM. (Defaulting to 1024GB) 2025-06-07 20:34:12 (5784): forwarding host port 52414 to guest port 80 2025-06-07 20:34:12 (5784): Enabling remote desktop for VM. 2025-06-07 20:34:13 (5784): Required extension pack not installed, remote desktop not enabled. 2025-06-07 20:34:13 (5784): Enabling shared directory for VM. 2025-06-07 20:34:13 (5784): Starting VM using VBoxManage interface. (boinc_809a4a7dca5ce0f8, slot#6) 2025-06-07 20:34:17 (5784): Error in start VM for VM: -2147467259 Command: VBoxManage -q startvm "boinc_809a4a7dca5ce0f8" --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_809a4a7dca5ce0f8" to power on... 2025-06-07 20:34:17 (5784): VM failed to start. 2025-06-07 20:34:17 (5784): Could not start 2025-06-07 20:34:17 (5784): ERROR: VM failed to start 2025-06-07 20:34:17 (5784): Powering off VM. 2025-06-07 20:34:17 (5784): Deregistering VM. (boinc_809a4a7dca5ce0f8, slot#6) 2025-06-07 20:34:17 (5784): Removing network bandwidth throttle group from VM. 2025-06-07 20:34:17 (5784): Removing VM from VirtualBox. Hypervisor System Log: 00:00:15.383018 ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0 00:00:15.383026 ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0 00:00:15.383033 ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0 00:00:15.383040 ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0 00:00:15.383047 ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0 00:00:15.383054 ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0 00:00:15.383061 ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0 00:00:15.383773 ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0 00:00:15.383804 ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0 00:00:15.383813 ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0 00:00:15.383820 ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0 00:00:15.383828 ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0 00:00:15.383835 ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0 00:00:15.383842 ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0 00:00:15.383857 ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0 00:00:15.383866 ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0 00:00:15.383873 ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0 00:00:15.383880 ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0 00:00:15.383888 ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0 00:00:15.383895 ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0 00:00:15.383902 ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0 00:00:15.383909 ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0 00:00:15.383916 ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0 00:00:15.383922 ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0 00:00:15.383929 ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0 00:00:15.383935 ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0 00:00:15.383942 ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0 00:00:15.383949 ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0 00:00:15.383955 ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0 00:00:15.383961 ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0 00:00:15.383968 ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0 00:00:15.383974 ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0 00:00:15.384155 Saving settings file "C:\Users\Tom\.VirtualBox\VirtualBox.xml" with version "1.12-windows" 00:00:15.388709 Finished saving settings file "C:\Users\Tom\.VirtualBox\VirtualBox.xml" 00:00:15.388879 Saving settings file "C:\Users\Tom\.VirtualBox\VirtualBox.xml" with version "1.12-windows" 00:00:15.390887 Finished saving settings file "C:\Users\Tom\.VirtualBox\VirtualBox.xml" 00:00:15.392049 DeleteVM Saving settings file "C:\Users\Tom\.VirtualBox\VirtualBox.xml" with version "1.12-windows" 00:00:15.393907 DeleteVM Finished saving settings file "C:\Users\Tom\.VirtualBox\VirtualBox.xml" 00:00:20.386446 main VirtualBox: object deletion starts 00:00:20.388295 main HostDnsMonitor: shutting down ... 00:00:20.388358 main HostDnsMonitor: shut down 00:00:20.389866 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 00:00:20.390278 main VirtualBox: object deleted VM Execution Log: VM Startup Log: VM Trace Log: ed" 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:\\ProgramFiles\\BOINC\\Data\\slots\\6\\boinc_809a4a7dca5ce0f8\\boinc_809a4a7dca5ce0f8-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="CMS_3655718_1749318366.537717_0" GuestMemoryBalloon=0 2025-06-07 20:34:07 (5784): Command: VBoxManage -q modifyvm "boinc_809a4a7dca5ce0f8" --nic1 nat --nic-type1 "virtio" --cable-connected1 off --nat-dns-proxy1 on Exit Code: 0 Output: 2025-06-07 20:34:07 (5784): Command: VBoxManage -q modifyvm "boinc_809a4a7dca5ce0f8" --cable-connected1 on Exit Code: 0 Output: 2025-06-07 20:34:07 (5784): Command: VBoxManage -q modifyvm "boinc_809a4a7dca5ce0f8" --usb off Exit Code: 0 Output: 2025-06-07 20:34:08 (5784): Command: VBoxManage -q modifyvm "boinc_809a4a7dca5ce0f8" --uart1 off --uart2 off Exit Code: 0 Output: 2025-06-07 20:34:08 (5784): Command: VBoxManage -q modifyvm "boinc_809a4a7dca5ce0f8" --lpt1 off --lpt2 off Exit Code: 0 Output: 2025-06-07 20:34:08 (5784): Command: VBoxManage -q modifyvm "boinc_809a4a7dca5ce0f8" --audio-enabled off Exit Code: 0 Output: 2025-06-07 20:34:08 (5784): Command: VBoxManage -q modifyvm "boinc_809a4a7dca5ce0f8" --clipboard disabled Exit Code: 0 Output: 2025-06-07 20:34:09 (5784): Command: VBoxManage -q modifyvm "boinc_809a4a7dca5ce0f8" --draganddrop disabled Exit Code: 0 Output: 2025-06-07 20:34:09 (5784): Command: VBoxManage -q storagectl "boinc_809a4a7dca5ce0f8" --name "Hard Disk Controller" --add "sata" --controller "IntelAHCI" --hostiocache off --portcount 3 Exit Code: 0 Output: 2025-06-07 20:34:09 (5784): Command: VBoxManage -q showhdinfo "C:\ProgramFiles\BOINC\Data/projects/lhcathome.cern.ch_lhcathome/CMS_2025_04_08_prod.vdi" Exit Code: 0 Output: UUID: fa49c4e2-ad29-47a5-b96a-3c89ce80d84c Parent UUID: base State: created Type: multiattach Location: C:\ProgramFiles\BOINC\Data\projects\lhcathome.cern.ch_lhcathome\CMS_2025_04_08_prod.vdi Storage format: VDI Format variant: dynamic default Capacity: 20480 MBytes Size on disk: 3853 MBytes Encryption: disabled Property: AllocationBlockSize=1048576 2025-06-07 20:34:10 (5784): Command: VBoxManage -q storageattach "boinc_809a4a7dca5ce0f8" --storagectl "Hard Disk Controller" --port 0 --device 0 --type hdd --mtype multiattach --medium "C:\ProgramFiles\BOINC\Data/projects/lhcathome.cern.ch_lhcathome/CMS_2025_04_08_prod.vdi" Exit Code: -2135228409 Output: VBoxManage.exe: error: Cannot attach medium 'C:\ProgramFiles\BOINC\Data\projects\lhcathome.cern.ch_lhcathome\CMS_2025_04_08_prod.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 785 of file VBoxManageStorageController.cpp 2025-06-07 20:34:10 (5784): Command: VBoxManage -q showhdinfo "C:\ProgramFiles\BOINC\Data/projects/lhcathome.cern.ch_lhcathome/CMS_2025_04_08_prod.vdi" Exit Code: 0 Output: UUID: fa49c4e2-ad29-47a5-b96a-3c89ce80d84c Parent UUID: base State: created Type: multiattach Location: C:\ProgramFiles\BOINC\Data\projects\lhcathome.cern.ch_lhcathome\CMS_2025_04_08_prod.vdi Storage format: VDI Format variant: dynamic default Capacity: 20480 MBytes Size on disk: 3853 MBytes Encryption: disabled Property: AllocationBlockSize=1048576 2025-06-07 20:34:10 (5784): Command: VBoxManage -q closemedium disk "C:\ProgramFiles\BOINC\Data\projects\lhcathome.cern.ch_lhcathome\CMS_2025_04_08_prod.vdi" Exit Code: 0 Output: 2025-06-07 20:34:10 (5784): Command: VBoxManage -q showhdinfo "C:\ProgramFiles\BOINC\Data/projects/lhcathome.cern.ch_lhcathome/CMS_2025_04_08_prod.vdi" Exit Code: 0 Output: UUID: fa49c4e2-ad29-47a5-b96a-3c89ce80d84c Parent UUID: base State: created Type: normal (base) Location: C:\ProgramFiles\BOINC\Data\projects\lhcathome.cern.ch_lhcathome\CMS_2025_04_08_prod.vdi Storage format: VDI Format variant: dynamic default Capacity: 20480 MBytes Size on disk: 3853 MBytes Encryption: disabled Property: AllocationBlockSize=1048576 2025-06-07 20:34:11 (5784): Command: VBoxManage -q storageattach "boinc_809a4a7dca5ce0f8" --storagectl "Hard Disk Controller" --port 0 --device 0 --type hdd --medium "C:\ProgramFiles\BOINC\Data/projects/lhcathome.cern.ch_lhcathome/CMS_2025_04_08_prod.vdi" Exit Code: 0 Output: 2025-06-07 20:34:11 (5784): Command: VBoxManage -q storageattach "boinc_809a4a7dca5ce0f8" --storagectl "Hard Disk Controller" --port 0 --device 0 --type hdd --medium none Exit Code: 0 Output: 2025-06-07 20:34:11 (5784): Command: VBoxManage -q storageattach "boinc_809a4a7dca5ce0f8" --storagectl "Hard Disk Controller" --port 0 --device 0 --type hdd --mtype multiattach --medium "C:\ProgramFiles\BOINC\Data/projects/lhcathome.cern.ch_lhcathome/CMS_2025_04_08_prod.vdi" Exit Code: 0 Output: 2025-06-07 20:34:12 (5784): Command: VBoxManage -q storageattach "boinc_809a4a7dca5ce0f8" --storagectl "Hard Disk Controller" --port 1 --device 0 --type dvddrive --medium "C:\Program Files\Oracle\VirtualBox/VBoxGuestAdditions.iso" Exit Code: 0 Output: 2025-06-07 20:34:12 (5784): Command: VBoxManage -q bandwidthctl "boinc_809a4a7dca5ce0f8" add "boinc_809a4a7dca5ce0f8_net" --type network --limit 1024G Exit Code: 0 Output: 2025-06-07 20:34:12 (5784): Command: VBoxManage -q modifyvm "boinc_809a4a7dca5ce0f8" --natpf1 ",tcp,127.0.0.1,52414,,80" Exit Code: 0 Output: 2025-06-07 20:34:13 (5784): Command: VBoxManage -q list extpacks Exit Code: 0 Output: Extension Packs: 0 2025-06-07 20:34:13 (5784): Command: VBoxManage -q sharedfolder add "boinc_809a4a7dca5ce0f8" --name "shared" --hostpath "C:\ProgramFiles\BOINC\Data\slots\6/shared" Exit Code: 0 Output: 2025-06-07 20:34:17 (5784): Command: VBoxManage -q startvm "boinc_809a4a7dca5ce0f8" --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_809a4a7dca5ce0f8" to power on... 2025-06-07 20:34:17 (5784): Command: VBoxManage -q snapshot "boinc_809a4a7dca5ce0f8" list Exit Code: -108 Output: This machine does not have any snapshots 2025-06-07 20:34:17 (5784): Command: VBoxManage -q bandwidthctl "boinc_809a4a7dca5ce0f8" remove "boinc_809a4a7dca5ce0f8_net" Exit Code: 0 Output: VBoxManage.exe: error: Bandwidth groups cannot be deleted while the VM is running 2025-06-07 20:34:18 (5784): Command: VBoxManage -q unregistervm "boinc_809a4a7dca5ce0f8" --delete Exit Code: -2135228409 Output: VBoxManage.exe: error: Cannot unregister the machine 'boinc_809a4a7dca5ce0f8' 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(fDeleteAll ? CleanupMode_DetachAllReturnHardDisksAndVMRemovable :CleanupMode_DetachAllReturnHardDisksOnly, ComSafeArrayAsOutParam(aMedia))" at line 236 of file VBoxManageMisc.cpp 2025-06-07 20:34:19 (5784): Command: VBoxManage -q unregistervm "boinc_809a4a7dca5ce0f8" --delete Exit Code: 0 Output: 0%...10%...20%...30%...40%...50%...60%...70%...80%...90%...100% 2025-06-07 20:34:24 (5784): called boinc_finish(-2147467259) </stderr_txt> ]]>
©2025 CERN