Name | Theory_2848-4533994-918_1 |
Workunit | 232281155 |
Created | 14 May 2025, 10:52:48 UTC |
Sent | 14 May 2025, 17:33:05 UTC |
Report deadline | 25 May 2025, 17:33:05 UTC |
Received | 14 May 2025, 18:07:34 UTC |
Server state | Over |
Outcome | Computation error |
Client state | Compute error |
Exit status | 1 (0x00000001) Unknown error code |
Computer ID | 10861154 |
Run time | 5 sec |
CPU time | |
Validate state | Invalid |
Credit | 0.00 |
Device peak FLOPS | 6.39 GFLOPS |
Application version | Theory Simulation v300.95 (vbox64_theory) x86_64-apple-darwin |
Peak working set size | 6.05 MB |
Peak swap size | 392.04 GB |
Peak disk usage | 1.33 MB |
<core_client_version>8.0.2</core_client_version> <![CDATA[ <message> process exited with code 1 (0x1, -255)</message> <stderr_txt> 2025-05-14 18:44:24 (58766): vboxwrapper version 26210 2025-05-14 18:44:24 (58766): BOINC client version: 8.0.2 2025-05-14 18:44:24 (58766): Detected: VirtualBox VboxManage Interface (Version: 6.1.34) 2025-05-14 18:44:24 (58766): Detected: Sandbox Configuration Enabled 2025-05-14 18:44:24 (58766): Detected: Heartbeat check (file: 'heartbeat' every 1800.000000 seconds) 2025-05-14 18:44:24 (58766): Successfully copied 'init_data.xml' to the shared directory. 2025-05-14 18:44:24 (58766): Successfully copied 'input' to the shared directory. 2025-05-14 18:44:25 (58766): Create VM. (boinc_177afc8226762fce, slot#6) 2025-05-14 18:44:25 (58766): Setting Memory Size for VM. (630MB) 2025-05-14 18:44:25 (58766): Setting CPU Count for VM. (1) 2025-05-14 18:44:25 (58766): Setting Chipset Options for VM. 2025-05-14 18:44:26 (58766): Setting Graphics Controller Options for VM. (Driver: VBoxVGA, 16MB) 2025-05-14 18:44:26 (58766): Setting Boot Options for VM. 2025-05-14 18:44:26 (58766): Setting Network Configuration for NAT. (Driver: virtio) 2025-05-14 18:44:26 (58766): Enabling VM Network Access. 2025-05-14 18:44:26 (58766): Disabling USB Support for VM. 2025-05-14 18:44:27 (58766): Disabling COM Port Support for VM. 2025-05-14 18:44:27 (58766): Disabling Audio Support for VM. 2025-05-14 18:44:27 (58766): Disabling Clipboard Support for VM. 2025-05-14 18:44:27 (58766): Disabling Drag and Drop Support for VM. 2025-05-14 18:44:27 (58766): Adding storage controller(s) to VM. 2025-05-14 18:44:28 (58766): Adding virtual disk drive to VM. (Theory_2025_04_17_prod.vdi) 2025-05-14 18:44:28 (58766): Adding VirtualBox Guest Additions to VM. 2025-05-14 18:44:28 (58766): Adding network bandwidth throttle group to VM. (Defaulting to 1024GB) 2025-05-14 18:44:29 (58766): forwarding host port 52495 to guest port 80 2025-05-14 18:44:29 (58766): Enabling remote desktop for VM. 2025-05-14 18:44:29 (58766): Required extension pack not installed, remote desktop not enabled. 2025-05-14 18:44:29 (58766): Enabling shared directory for VM. 2025-05-14 18:44:29 (58766): Starting VM using VBoxManage interface. (boinc_177afc8226762fce, slot#6) 2025-05-14 18:44:30 (58766): Error in start VM for VM: 1 Command: VBoxManage -q startvm "boinc_177afc8226762fce" --type headless Output: VBoxManage: error: The virtual machine 'boinc_177afc8226762fce' has terminated unexpectedly during startup with exit code 1 (0x1) VBoxManage: error: Details: code NS_ERROR_FAILURE (0x80004005), component MachineWrap, interface IMachine Waiting for VM "boinc_177afc8226762fce" to power on... 2025-05-14 18:44:30 (58766): VM failed to start. 2025-05-14 18:44:30 (58766): Could not start 2025-05-14 18:44:30 (58766): ERROR: VM failed to start 2025-05-14 18:44:30 (58766): Powering off VM. 2025-05-14 18:44:30 (58766): Deregistering VM. (boinc_177afc8226762fce, slot#6) 2025-05-14 18:44:30 (58766): Removing network bandwidth throttle group from VM. 2025-05-14 18:44:30 (58766): Removing VM from VirtualBox. Hypervisor System Log: 00:00:02.023449 nspr-2 WARNING [COM]: aRC=NS_ERROR_FAILURE (0x80004005) aIID={16ced992-5fdc-4aba-aff5-6a39bbd7c38b} aComponent={HostWrap} aText={Could not load the Host USB Proxy service: VERR_GENERAL_FAILURE}, preserve=true aResultDetail=0 00:00:02.024107 nspr-3 WARNING [COM]: aRC=NS_ERROR_FAILURE (0x80004005) aIID={16ced992-5fdc-4aba-aff5-6a39bbd7c38b} aComponent={HostWrap} aText={Could not load the Host USB Proxy service: VERR_GENERAL_FAILURE}, preserve=true aResultDetail=0 00:00:02.028277 nspr-2 ERROR [COM]: aRC=NS_ERROR_FAILURE (0x80004005) aIID={85632c68-b5bb-4316-a900-5eb28d3413df} aComponent={SessionMachine} aText={This machine does not have any snapshots}, preserve=false aResultDetail=0 00:00:02.244848 nspr-2 Saving settings file "/Library/Application Support/BOINC Data/slots/6/boinc_177afc8226762fce/boinc_177afc8226762fce.vbox" with version "1.16-macosx" 00:00:02.441330 nspr-3 Saving settings file "/Library/Application Support/BOINC Data/slots/6/boinc_177afc8226762fce/boinc_177afc8226762fce.vbox" with version "1.16-macosx" 00:00:02.639034 nspr-3 Saving settings file "/Library/Application Support/BOINC Data/slots/6/boinc_177afc8226762fce/boinc_177afc8226762fce.vbox" with version "1.16-macosx" 00:00:02.870120 nspr-2 Saving settings file "/Library/Application Support/BOINC Data/slots/6/boinc_177afc8226762fce/boinc_177afc8226762fce.vbox" with version "1.16-macosx" 00:00:03.023382 nspr-2 Saving settings file "/Library/Application Support/BOINC Data/slots/6/boinc_177afc8226762fce/boinc_177afc8226762fce.vbox" with version "1.16-macosx" 00:00:03.213526 nspr-2 Saving settings file "/Library/Application Support/BOINC Data/slots/6/boinc_177afc8226762fce/boinc_177afc8226762fce.vbox" with version "1.16-macosx" 00:00:03.455230 nspr-2 Saving settings file "/Library/Application Support/BOINC Data/slots/6/boinc_177afc8226762fce/boinc_177afc8226762fce.vbox" with version "1.16-macosx" 00:00:03.524108 nspr-3 Saving settings file "/Library/Application Support/BOINC Data/slots/6/boinc_177afc8226762fce/boinc_177afc8226762fce.vbox" with version "1.16-macosx" 00:00:03.867362 nspr-3 ERROR [COM]: aRC=VBOX_E_OBJECT_NOT_FOUND (0x80bb0001) aIID={85632c68-b5bb-4316-a900-5eb28d3413df} aComponent={SessionMachine} aText={No storage device attached to device slot 0 on port 0 of controller 'Hard Disk Controller'}, preserve=false aResultDetail=0 00:00:03.868597 nspr-3 ERROR [COM]: aRC=VBOX_E_OBJECT_NOT_FOUND (0x80bb0001) aIID={85632c68-b5bb-4316-a900-5eb28d3413df} aComponent={SessionMachine} aText={No storage device attached to device slot 0 on port 0 of controller 'Hard Disk Controller'}, preserve=false aResultDetail=0 00:00:03.869034 nspr-3 Saving settings file "/Library/Application Support/BOINC Data/projects/VirtualBox/VirtualBox.xml" with version "1.12-macosx" 00:00:03.871097 nspr-3 Saving settings file "/Library/Application Support/BOINC Data/slots/6/boinc_177afc8226762fce/boinc_177afc8226762fce.vbox" with version "1.16-macosx" 00:00:04.026388 nspr-3 Saving settings file "/Library/Application Support/BOINC Data/slots/6/boinc_177afc8226762fce/boinc_177afc8226762fce.vbox" with version "1.16-macosx" 00:00:04.181649 nspr-2 ERROR [COM]: aRC=VBOX_E_OBJECT_NOT_FOUND (0x80bb0001) aIID={85632c68-b5bb-4316-a900-5eb28d3413df} aComponent={SessionMachine} aText={No storage device attached to device slot 0 on port 0 of controller 'Hard Disk Controller'}, preserve=false aResultDetail=0 00:00:04.183151 nspr-3 Saving settings file "/Library/Application Support/BOINC Data/slots/6/boinc_177afc8226762fce/boinc_177afc8226762fce.vbox" with version "1.16-macosx" 00:00:04.185618 nspr-2 ERROR [COM]: aRC=VBOX_E_OBJECT_NOT_FOUND (0x80bb0001) aIID={85632c68-b5bb-4316-a900-5eb28d3413df} aComponent={SessionMachine} aText={No storage device attached to device slot 0 on port 0 of controller 'Hard Disk Controller'}, preserve=false aResultDetail=0 00:00:04.187298 nspr-2 Saving settings file "/Library/Application Support/BOINC Data/slots/6/boinc_177afc8226762fce/boinc_177afc8226762fce.vbox" with version "1.16-macosx" 00:00:04.189228 nspr-2 Saving settings file "/Library/Application Support/BOINC Data/slots/6/boinc_177afc8226762fce/boinc_177afc8226762fce.vbox" with version "1.16-macosx" 00:00:04.344836 nspr-3 ERROR [COM]: aRC=VBOX_E_OBJECT_NOT_FOUND (0x80bb0001) aIID={85632c68-b5bb-4316-a900-5eb28d3413df} aComponent={SessionMachine} aText={No storage device attached to device slot 0 on port 1 of controller 'Hard Disk Controller'}, preserve=false aResultDetail=0 00:00:04.354780 nspr-3 ERROR [COM]: aRC=VBOX_E_OBJECT_NOT_FOUND (0x80bb0001) aIID={85632c68-b5bb-4316-a900-5eb28d3413df} aComponent={SessionMachine} aText={No storage device attached to device slot 0 on port 1 of controller 'Hard Disk Controller'}, preserve=false aResultDetail=0 00:00:04.355131 nspr-3 Saving settings file "/Library/Application Support/BOINC Data/projects/VirtualBox/VirtualBox.xml" with version "1.12-macosx" 00:00:04.405139 nspr-2 Saving settings file "/Library/Application Support/BOINC Data/projects/VirtualBox/VirtualBox.xml" with version "1.12-macosx" 00:00:04.407681 nspr-2 Saving settings file "/Library/Application Support/BOINC Data/slots/6/boinc_177afc8226762fce/boinc_177afc8226762fce.vbox" with version "1.16-macosx" 00:00:04.586280 nspr-3 Saving settings file "/Library/Application Support/BOINC Data/slots/6/boinc_177afc8226762fce/boinc_177afc8226762fce.vbox" with version "1.16-macosx" 00:00:04.726150 nspr-3 Saving settings file "/Library/Application Support/BOINC Data/slots/6/boinc_177afc8226762fce/boinc_177afc8226762fce.vbox" with version "1.16-macosx" 00:00:04.959192 nspr-3 Saving settings file "/Library/Application Support/BOINC Data/slots/6/boinc_177afc8226762fce/boinc_177afc8226762fce.vbox" with version "1.16-macosx" 00:00:05.166415 nspr-2 ERROR [COM]: aRC=VBOX_E_OBJECT_NOT_FOUND (0x80bb0001) aIID={85632c68-b5bb-4316-a900-5eb28d3413df} aComponent={SessionMachine} aText={No storage device attached to device slot 0 on port 2 of controller 'Hard Disk Controller'}, preserve=false aResultDetail=0 00:00:05.167025 nspr-3 ERROR [COM]: aRC=VBOX_E_OBJECT_NOT_FOUND (0x80bb0001) aIID={85632c68-b5bb-4316-a900-5eb28d3413df} aComponent={SessionMachine} aText={No storage device attached to device slot 0 on port 2 of controller 'Hard Disk Controller'}, preserve=false aResultDetail=0 00:00:05.177501 nspr-3 WARNING [COM]: aRC=NS_ERROR_FAILURE (0x80004005) aIID={16ced992-5fdc-4aba-aff5-6a39bbd7c38b} aComponent={HostWrap} aText={Could not load the Host USB Proxy service: VERR_GENERAL_FAILURE}, preserve=true aResultDetail=0 00:00:05.177977 nspr-2 WARNING [COM]: aRC=NS_ERROR_FAILURE (0x80004005) aIID={16ced992-5fdc-4aba-aff5-6a39bbd7c38b} aComponent={HostWrap} aText={Could not load the Host USB Proxy service: VERR_GENERAL_FAILURE}, preserve=true aResultDetail=0 00:00:05.184567 nspr-3 ERROR [COM]: aRC=NS_ERROR_FAILURE (0x80004005) aIID={85632c68-b5bb-4316-a900-5eb28d3413df} aComponent={SessionMachine} aText={This machine does not have any snapshots}, preserve=false aResultDetail=0 00:00:05.341998 nspr-3 Launched VM: 50365184 pid: 58833 (0xe5d1) frontend: headless name: boinc_177afc8226762fce 00:00:05.956308 Watcher ERROR [COM]: aRC=NS_ERROR_FAILURE (0x80004005) aIID={85632c68-b5bb-4316-a900-5eb28d3413df} aComponent={MachineWrap} aText={The virtual machine 'boinc_177afc8226762fce' has terminated unexpectedly during startup with exit code 1 (0x1)}, preserve=false aResultDetail=0 00:00:06.152405 nspr-3 ERROR [COM]: aRC=NS_ERROR_FAILURE (0x80004005) aIID={85632c68-b5bb-4316-a900-5eb28d3413df} aComponent={SessionMachine} aText={This machine does not have any snapshots}, preserve=false aResultDetail=0 00:00:06.259698 nspr-2 Saving settings file "/Library/Application Support/BOINC Data/slots/6/boinc_177afc8226762fce/boinc_177afc8226762fce.vbox" with version "1.16-macosx" 00:00:06.426662 nspr-3 Saving settings file "/Library/Application Support/BOINC Data/projects/VirtualBox/VirtualBox.xml" with version "1.12-macosx" VM Execution Log: VM Startup Log: VM Trace Log: VBoxManage: error: Context: "FindMachine(Bstr(VMNameOrUuid).raw(), machine.asOutParam())" at line 2733 of file VBoxManageInfo.cpp 2025-05-14 18:44:25 (58766): Command: VBoxManage -q createvm --name "boinc_177afc8226762fce" --basefolder "/Library/Application Support/BOINC Data/slots/6" --ostype "Linux26_64" --register Exit Code: 0 Output: Virtual machine 'boinc_177afc8226762fce' is created and registered. UUID: faccb80a-da74-4df5-995d-df30a5a871f5 Settings file: '/Library/Application Support/BOINC Data/slots/6/boinc_177afc8226762fce/boinc_177afc8226762fce.vbox' 2025-05-14 18:44:25 (58766): Command: VBoxManage -q modifyvm "boinc_177afc8226762fce" --description "Theory_2848-4533994-918_1" Exit Code: 0 Output: 2025-05-14 18:44:25 (58766): Command: VBoxManage -q modifyvm "boinc_177afc8226762fce" --memory 630 Exit Code: 0 Output: 2025-05-14 18:44:25 (58766): Command: VBoxManage -q modifyvm "boinc_177afc8226762fce" --cpus 1 Exit Code: 0 Output: 2025-05-14 18:44:26 (58766): Command: VBoxManage -q modifyvm "boinc_177afc8226762fce" --acpi on --ioapic on --rtcuseutc on Exit Code: 0 Output: 2025-05-14 18:44:26 (58766): Command: VBoxManage -q modifyvm "boinc_177afc8226762fce" --vram 16 --graphicscontroller VBoxVGA Exit Code: 0 Output: 2025-05-14 18:44:26 (58766): Command: VBoxManage -q modifyvm "boinc_177afc8226762fce" --boot1 disk --boot2 dvd --boot3 none --boot4 none Exit Code: 0 Output: 2025-05-14 18:44:26 (58766): Command: VBoxManage -q showvminfo "boinc_177afc8226762fce" --machinereadable Exit Code: 0 Output: name="boinc_177afc8226762fce" groups="/" ostype="Linux 2.6 / 3.x / 4.x (64-bit)" UUID="faccb80a-da74-4df5-995d-df30a5a871f5" CfgFile="/Library/Application Support/BOINC Data/slots/6/boinc_177afc8226762fce/boinc_177afc8226762fce.vbox" SnapFldr="/Library/Application Support/BOINC Data/slots/6/boinc_177afc8226762fce/Snapshots" LogFldr="/Library/Application Support/BOINC Data/slots/6/boinc_177afc8226762fce/Logs" hardwareuuid="faccb80a-da74-4df5-995d-df30a5a871f5" 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 rtcuseutc="on" hwvirtex="on" nestedpaging="on" largepages="on" vtxvpid="on" vtxux="on" paravirtprovider="default" effparavirtprovider="kvm" VMState="poweroff" VMStateChangeTime="2025-05-14T17:44:25.235000000" 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="0800279B81D9" 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="coreaudio" audio_out="off" audio_in="off" clipboard="disabled" draganddrop="disabled" vrde="off" usb="off" ehci="off" xhci="off" videocap="off" videocapaudio="off" capturescreens="" capturefilename="/Library/Application Support/BOINC Data/slots/6/boinc_177afc8226762fce/boinc_177afc8226762fce.webm" captureres="1024x768" capturevideorate=512 capturevideofps=25 captureopts="" description="Theory_2848-4533994-918_1" GuestMemoryBalloon=0 2025-05-14 18:44:26 (58766): Command: VBoxManage -q modifyvm "boinc_177afc8226762fce" --nic1 nat --nictype1 "virtio" --cableconnected1 off --natdnsproxy1 on Exit Code: 0 Output: 2025-05-14 18:44:26 (58766): Command: VBoxManage -q modifyvm "boinc_177afc8226762fce" --cableconnected1 on Exit Code: 0 Output: 2025-05-14 18:44:27 (58766): Command: VBoxManage -q modifyvm "boinc_177afc8226762fce" --usb off Exit Code: 0 Output: 2025-05-14 18:44:27 (58766): Command: VBoxManage -q modifyvm "boinc_177afc8226762fce" --uart1 off --uart2 off Exit Code: 0 Output: 2025-05-14 18:44:27 (58766): Command: VBoxManage -q modifyvm "boinc_177afc8226762fce" --audio none Exit Code: 0 Output: 2025-05-14 18:44:27 (58766): Command: VBoxManage -q modifyvm "boinc_177afc8226762fce" --clipboard disabled Exit Code: 0 Output: 2025-05-14 18:44:27 (58766): Command: VBoxManage -q modifyvm "boinc_177afc8226762fce" --draganddrop disabled Exit Code: 0 Output: 2025-05-14 18:44:28 (58766): Command: VBoxManage -q storagectl "boinc_177afc8226762fce" --name "Hard Disk Controller" --add "sata" --controller "IntelAHCI" --hostiocache off --portcount 3 Exit Code: 0 Output: 2025-05-14 18:44:28 (58766): Command: VBoxManage -q showhdinfo "/Library/Application Support/BOINC Data/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: normal (base) Location: /Library/Application Support/BOINC Data/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 2025-05-14 18:44:28 (58766): Command: VBoxManage -q storageattach "boinc_177afc8226762fce" --storagectl "Hard Disk Controller" --port 0 --device 0 --type hdd --medium "/Library/Application Support/BOINC Data/projects/lhcathome.cern.ch_lhcathome/Theory_2025_04_17_prod.vdi" Exit Code: 0 Output: 2025-05-14 18:44:28 (58766): Command: VBoxManage -q storageattach "boinc_177afc8226762fce" --storagectl "Hard Disk Controller" --port 0 --device 0 --type hdd --medium none Exit Code: 0 Output: 2025-05-14 18:44:28 (58766): Command: VBoxManage -q storageattach "boinc_177afc8226762fce" --storagectl "Hard Disk Controller" --port 0 --device 0 --type hdd --mtype multiattach --medium "/Library/Application Support/BOINC Data/projects/lhcathome.cern.ch_lhcathome/Theory_2025_04_17_prod.vdi" Exit Code: 0 Output: 2025-05-14 18:44:28 (58766): Command: VBoxManage -q storageattach "boinc_177afc8226762fce" --storagectl "Hard Disk Controller" --port 1 --device 0 --type dvddrive --medium "/Applications/VirtualBox.app/Contents/MacOS/VBoxGuestAdditions.iso" Exit Code: 0 Output: 2025-05-14 18:44:29 (58766): Command: VBoxManage -q bandwidthctl "boinc_177afc8226762fce" add "boinc_177afc8226762fce_net" --type network --limit 1024G Exit Code: 0 Output: 2025-05-14 18:44:29 (58766): Command: VBoxManage -q modifyvm "boinc_177afc8226762fce" --natpf1 ",tcp,127.0.0.1,52495,,80" Exit Code: 0 Output: 2025-05-14 18:44:29 (58766): Command: VBoxManage -q list extpacks Exit Code: 0 Output: Extension Packs: 0 2025-05-14 18:44:29 (58766): Command: VBoxManage -q sharedfolder add "boinc_177afc8226762fce" --name "shared" --hostpath "/Library/Application Support/BOINC Data/slots/6/shared" Exit Code: 0 Output: 2025-05-14 18:44:30 (58766): Command: VBoxManage -q startvm "boinc_177afc8226762fce" --type headless Exit Code: 1 Output: VBoxManage: error: The virtual machine 'boinc_177afc8226762fce' has terminated unexpectedly during startup with exit code 1 (0x1) VBoxManage: error: Details: code NS_ERROR_FAILURE (0x80004005), component MachineWrap, interface IMachine Waiting for VM "boinc_177afc8226762fce" to power on... 2025-05-14 18:44:30 (58766): Command: VBoxManage -q snapshot "boinc_177afc8226762fce" list Exit Code: 0 Output: This machine does not have any snapshots 2025-05-14 18:44:30 (58766): Command: VBoxManage -q bandwidthctl "boinc_177afc8226762fce" remove "boinc_177afc8226762fce_net" Exit Code: 0 Output: 2025-05-14 18:44:30 (58766): Command: VBoxManage -q unregistervm "boinc_177afc8226762fce" --delete Exit Code: 0 Output: 0%...10%...20%...30%...40%...50%...60%...70%...80%...90%...100% 2025-05-14 18:44:35 (58766): called boinc_finish(1) </stderr_txt> ]]>
©2025 CERN