Name | ZktKDmElTe7n9Rq4apOajLDm4fhM0noT9bVof3QYDmGOTKDmR5oITo_3 |
Workunit | 232663711 |
Created | 2 Jun 2025, 19:23:31 UTC |
Sent | 2 Jun 2025, 20:29:11 UTC |
Report deadline | 10 Jun 2025, 20:29:11 UTC |
Received | 2 Jun 2025, 22:38:44 UTC |
Server state | Over |
Outcome | Computation error |
Client state | Compute error |
Exit status | 1 (0x00000001) Unknown error code |
Computer ID | 10668170 |
Run time | 19 sec |
CPU time | |
Validate state | Invalid |
Credit | 0.00 |
Device peak FLOPS | 15.94 GFLOPS |
Application version | ATLAS Simulation v3.01 (vbox64_mt_mcore_atlas) windows_x86_64 |
Peak working set size | 11.73 MB |
Peak swap size | 6.23 MB |
Peak disk usage | 213.78 MB |
<core_client_version>8.0.2</core_client_version> <![CDATA[ <message> Unzul�ssige Funktion. (0x1) - exit code 1 (0x1)</message> <stderr_txt> 2025-06-03 00:01:45 (5452): Detected: vboxwrapper 26206 2025-06-03 00:01:45 (5452): Detected: BOINC client v8.0.2 2025-06-03 00:01:47 (5452): Detected: VirtualBox VboxManage Interface (Version: 7.1.8) 2025-06-03 00:01:47 (5452): Successfully copied 'init_data.xml' to the shared directory. 2025-06-03 00:01:47 (5452): Create VM. (boinc_e906384cb35d1784, slot#1) 2025-06-03 00:01:48 (5452): Setting Memory Size for VM. (4400MB) 2025-06-03 00:01:48 (5452): Setting CPU Count for VM. (4) 2025-06-03 00:01:48 (5452): Setting Chipset Options for VM. 2025-06-03 00:01:49 (5452): Setting Graphics Controller Options for VM. 2025-06-03 00:01:49 (5452): Setting Boot Options for VM. 2025-06-03 00:01:49 (5452): Setting Network Configuration for NAT. 2025-06-03 00:01:49 (5452): Enabling VM Network Access. 2025-06-03 00:01:50 (5452): Disabling USB Support for VM. 2025-06-03 00:01:50 (5452): Disabling COM Port Support for VM. 2025-06-03 00:01:50 (5452): Disabling LPT Port Support for VM. 2025-06-03 00:01:50 (5452): Disabling Audio Support for VM. 2025-06-03 00:01:51 (5452): Disabling Clipboard Support for VM. 2025-06-03 00:01:51 (5452): Disabling Drag and Drop Support for VM. 2025-06-03 00:01:51 (5452): Adding storage controller(s) to VM. 2025-06-03 00:01:52 (5452): Adding virtual disk drive to VM. (ATLAS_vbox_3.01_image.vdi) 2025-06-03 00:01:54 (5452): Adding VirtualBox Guest Additions to VM. 2025-06-03 00:01:55 (5452): Adding network bandwidth throttle group to VM. (Defaulting to 1024GB) 2025-06-03 00:01:55 (5452): forwarding host port 56749 to guest port 80 2025-06-03 00:01:55 (5452): Enabling remote desktop for VM. 2025-06-03 00:01:55 (5452): Required extension pack not installed, remote desktop not enabled. 2025-06-03 00:01:55 (5452): Enabling shared directory for VM. 2025-06-03 00:01:56 (5452): Starting VM using VBoxManage interface. (boinc_e906384cb35d1784, slot#1) 2025-06-03 00:01:57 (5452): Error in start VM for VM: 1 Command: VBoxManage -q startvm "boinc_e906384cb35d1784" --type headless Output: VBoxManage.exe: error: The virtual machine 'boinc_e906384cb35d1784' has terminated unexpectedly during startup with exit code 1 (0x1). More details may be available in 'C:\ProgramData\BOINC\DATA\slots\1\boinc_e906384cb35d1784\Logs\VBoxHardening.log' VBoxManage.exe: error: Details: code E_FAIL (0x80004005), component MachineWrap, interface IMachine Waiting for VM "boinc_e906384cb35d1784" to power on... 2025-06-03 00:01:57 (5452): VM failed to start. 2025-06-03 00:01:57 (5452): Could not start 2025-06-03 00:01:57 (5452): ERROR: VM failed to start 2025-06-03 00:01:57 (5452): Powering off VM. 2025-06-03 00:01:57 (5452): Deregistering VM. (boinc_e906384cb35d1784, slot#1) 2025-06-03 00:01:57 (5452): Removing network bandwidth throttle group from VM. 2025-06-03 00:01:57 (5452): Removing VM from VirtualBox. Hypervisor System Log: 00:00:07.849272 Saving settings file "C:\ProgramData\BOINC\DATA\slots\1\boinc_e906384cb35d1784\boinc_e906384cb35d1784.vbox" with version "1.19-windows" 00:00:07.852848 Finished saving settings file "C:\ProgramData\BOINC\DATA\slots\1\boinc_e906384cb35d1784\boinc_e906384cb35d1784.vbox" 00:00:08.106914 Platform architecture set to 'x86' 00:00:08.108675 Saving settings file "C:\ProgramData\BOINC\DATA\slots\1\boinc_e906384cb35d1784\boinc_e906384cb35d1784.vbox" with version "1.19-windows" 00:00:08.113687 Finished saving settings file "C:\ProgramData\BOINC\DATA\slots\1\boinc_e906384cb35d1784\boinc_e906384cb35d1784.vbox" 00:00:08.371530 Platform architecture set to 'x86' 00:00:08.373187 ERROR [COM]: aRC=VBOX_E_OBJECT_NOT_FOUND (0x80bb0001) aIID={e36a5081-a82a-40bd-9e4e-42a44d6ce50f} aComponent={SessionMachine} aText={No storage device attached to device slot 0 on port 0 of controller 'Hard Disk Controller'}, preserve=false aResultDetail=0 00:00:08.373773 Saving settings file "C:\ProgramData\BOINC\DATA\slots\1\boinc_e906384cb35d1784\boinc_e906384cb35d1784.vbox" with version "1.19-windows" 00:00:08.379211 Finished saving settings file "C:\ProgramData\BOINC\DATA\slots\1\boinc_e906384cb35d1784\boinc_e906384cb35d1784.vbox" 00:00:08.379384 ERROR [COM]: aRC=VBOX_E_OBJECT_NOT_FOUND (0x80bb0001) aIID={e36a5081-a82a-40bd-9e4e-42a44d6ce50f} aComponent={SessionMachine} aText={No storage device attached to device slot 0 on port 0 of controller 'Hard Disk Controller'}, preserve=false aResultDetail=0 00:00:08.380877 Saving settings file "C:\ProgramData\BOINC\DATA\slots\1\boinc_e906384cb35d1784\boinc_e906384cb35d1784.vbox" with version "1.19-windows" 00:00:08.388615 Finished saving settings file "C:\ProgramData\BOINC\DATA\slots\1\boinc_e906384cb35d1784\boinc_e906384cb35d1784.vbox" 00:00:08.389214 Saving settings file "C:\ProgramData\BOINC\DATA\slots\1\boinc_e906384cb35d1784\boinc_e906384cb35d1784.vbox" with version "1.19-windows" 00:00:08.394197 Finished saving settings file "C:\ProgramData\BOINC\DATA\slots\1\boinc_e906384cb35d1784\boinc_e906384cb35d1784.vbox" 00:00:08.637844 Platform architecture set to 'x86' 00:00:08.639412 ERROR [COM]: aRC=VBOX_E_OBJECT_NOT_FOUND (0x80bb0001) aIID={e36a5081-a82a-40bd-9e4e-42a44d6ce50f} aComponent={SessionMachine} aText={No storage device attached to device slot 0 on port 1 of controller 'Hard Disk Controller'}, preserve=false aResultDetail=0 00:00:08.640356 ERROR [COM]: aRC=VBOX_E_OBJECT_NOT_FOUND (0x80bb0001) aIID={e36a5081-a82a-40bd-9e4e-42a44d6ce50f} aComponent={SessionMachine} aText={No storage device attached to device slot 0 on port 1 of controller 'Hard Disk Controller'}, preserve=false aResultDetail=0 00:00:08.640500 Saving settings file "C:\Users\4355\.VirtualBox\VirtualBox.xml" with version "1.12-windows" 00:00:08.646631 Finished saving settings file "C:\Users\4355\.VirtualBox\VirtualBox.xml" 00:00:08.646906 Saving settings file "C:\Users\4355\.VirtualBox\VirtualBox.xml" with version "1.12-windows" 00:00:08.649568 Finished saving settings file "C:\Users\4355\.VirtualBox\VirtualBox.xml" 00:00:08.650071 Saving settings file "C:\ProgramData\BOINC\DATA\slots\1\boinc_e906384cb35d1784\boinc_e906384cb35d1784.vbox" with version "1.19-windows" 00:00:08.653470 Finished saving settings file "C:\ProgramData\BOINC\DATA\slots\1\boinc_e906384cb35d1784\boinc_e906384cb35d1784.vbox" 00:00:08.903939 Platform architecture set to 'x86' 00:00:08.905253 Saving settings file "C:\ProgramData\BOINC\DATA\slots\1\boinc_e906384cb35d1784\boinc_e906384cb35d1784.vbox" with version "1.19-windows" 00:00:08.910543 Finished saving settings file "C:\ProgramData\BOINC\DATA\slots\1\boinc_e906384cb35d1784\boinc_e906384cb35d1784.vbox" 00:00:09.171142 Platform architecture set to 'x86' 00:00:09.173014 Saving settings file "C:\ProgramData\BOINC\DATA\slots\1\boinc_e906384cb35d1784\boinc_e906384cb35d1784.vbox" with version "1.19-windows" 00:00:09.176474 Finished saving settings file "C:\ProgramData\BOINC\DATA\slots\1\boinc_e906384cb35d1784\boinc_e906384cb35d1784.vbox" 00:00:09.701263 Platform architecture set to 'x86' 00:00:09.702417 Saving settings file "C:\ProgramData\BOINC\DATA\slots\1\boinc_e906384cb35d1784\boinc_e906384cb35d1784.vbox" with version "1.19-windows" 00:00:09.707985 Finished saving settings file "C:\ProgramData\BOINC\DATA\slots\1\boinc_e906384cb35d1784\boinc_e906384cb35d1784.vbox" 00:00:09.965529 Platform architecture set to 'x86' 00:00:09.980306 ERROR [COM]: aRC=VBOX_E_NOT_SUPPORTED (0x80bb0009) aIID={e36a5081-a82a-40bd-9e4e-42a44d6ce50f} aComponent={SessionMachine} aText={This VM is not encrypted}, preserve=false aResultDetail=0 00:00:09.984623 ERROR [COM]: aRC=VBOX_E_OBJECT_NOT_FOUND (0x80bb0001) aIID={e36a5081-a82a-40bd-9e4e-42a44d6ce50f} aComponent={SessionMachine} aText={No storage device attached to device slot 0 on port 2 of controller 'Hard Disk Controller'}, preserve=false aResultDetail=0 00:00:09.984686 ERROR [COM]: aRC=VBOX_E_OBJECT_NOT_FOUND (0x80bb0001) aIID={e36a5081-a82a-40bd-9e4e-42a44d6ce50f} aComponent={SessionMachine} aText={No storage device attached to device slot 0 on port 2 of controller 'Hard Disk Controller'}, preserve=false aResultDetail=0 00:00:09.989607 ERROR [COM]: aRC=E_FAIL (0x80004005) aIID={bea3ef5c-de2f-4b74-aa3a-15d6249371a0} aComponent={RecordingSettingsWrap} aText={Recording not started}, preserve=false aResultDetail=0 00:00:09.990366 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 00:00:10.229057 Launched VM: 3063151440 pid: 8592 (0x2190) frontend: headless name: boinc_e906384cb35d1784 00:00:11.281981 Watcher ERROR [COM]: aRC=E_FAIL (0x80004005) aIID={e36a5081-a82a-40bd-9e4e-42a44d6ce50f} aComponent={MachineWrap} aText={The virtual machine 'boinc_e906384cb35d1784' has terminated unexpectedly during startup with exit code 1 (0x1). More details may be available in 'C:\ProgramData\BOINC\DATA\slots\1\boinc_e906384cb35d1784\Logs\VBoxHardening.log'}, preserve=false aResultDetail=0 00:00:11.333478 Platform architecture set to 'x86' 00:00:11.334341 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 00:00:11.379988 Platform architecture set to 'x86' 00:00:11.381222 Saving settings file "C:\ProgramData\BOINC\DATA\slots\1\boinc_e906384cb35d1784\boinc_e906384cb35d1784.vbox" with version "1.19-windows" 00:00:11.386955 Finished saving settings file "C:\ProgramData\BOINC\DATA\slots\1\boinc_e906384cb35d1784\boinc_e906384cb35d1784.vbox" 00:00:11.644935 Saving settings file "C:\Users\4355\.VirtualBox\VirtualBox.xml" with version "1.12-windows" 00:00:11.650138 Finished saving settings file "C:\Users\4355\.VirtualBox\VirtualBox.xml" 00:00:11.650256 Saving settings file "C:\Users\4355\.VirtualBox\VirtualBox.xml" with version "1.12-windows" 00:00:11.654128 Finished saving settings file "C:\Users\4355\.VirtualBox\VirtualBox.xml" 00:00:11.654855 DeleteVM Saving settings file "C:\Users\4355\.VirtualBox\VirtualBox.xml" with version "1.12-windows" 00:00:11.657845 DeleteVM Finished saving settings file "C:\Users\4355\.VirtualBox\VirtualBox.xml" 00:00:16.666255 main VirtualBox: object deletion starts 00:00:16.666966 main HostDnsMonitor: shutting down ... 00:00:16.667092 main HostDnsMonitor: shut down 00:00:16.670419 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 00:00:16.670692 main VirtualBox: object deleted VM Execution Log: VM Startup Log: VM Trace Log: ).raw(), enmDevType, enmAccessMode, fForceNewUuidOnOpen, pMedium.asOutParam())" at line 201 of file VBoxManageDisk.cpp 2025-06-03 00:01:48 (5452): Command: VBoxManage -q createvm --name "boinc_e906384cb35d1784" --basefolder "C:\ProgramData\BOINC\DATA\slots\1" --ostype "Linux26_64" --register Exit Code: 0 Output: Virtual machine 'boinc_e906384cb35d1784' is created and registered. UUID: 0b8c6305-823a-4fdd-9e11-27516606def4 Settings file: 'C:\ProgramData\BOINC\DATA\slots\1\boinc_e906384cb35d1784\boinc_e906384cb35d1784.vbox' 2025-06-03 00:01:48 (5452): Command: VBoxManage -q modifyvm "boinc_e906384cb35d1784" --description "ZktKDmElTe7n9Rq4apOajLDm4fhM0noT9bVof3QYDmGOTKDmR5oITo_3" Exit Code: 0 Output: 2025-06-03 00:01:48 (5452): Command: VBoxManage -q modifyvm "boinc_e906384cb35d1784" --memory 4400 Exit Code: 0 Output: 2025-06-03 00:01:48 (5452): Command: VBoxManage -q modifyvm "boinc_e906384cb35d1784" --cpus 4 Exit Code: 0 Output: 2025-06-03 00:01:49 (5452): Command: VBoxManage -q modifyvm "boinc_e906384cb35d1784" --acpi on --ioapic on --rtcuseutc off Exit Code: 0 Output: 2025-06-03 00:01:49 (5452): Command: VBoxManage -q modifyvm "boinc_e906384cb35d1784" --vram 16 --graphicscontroller VBoxVGA Exit Code: 0 Output: 2025-06-03 00:01:49 (5452): Command: VBoxManage -q modifyvm "boinc_e906384cb35d1784" --boot1 disk --boot2 dvd --boot3 none --boot4 none Exit Code: 0 Output: 2025-06-03 00:01:49 (5452): Command: VBoxManage -q modifyvm "boinc_e906384cb35d1784" --nic1 nat --natdnsproxy1 on --cableconnected1 off Exit Code: 0 Output: 2025-06-03 00:01:50 (5452): Command: VBoxManage -q modifyvm "boinc_e906384cb35d1784" --cableconnected1 on Exit Code: 0 Output: 2025-06-03 00:01:50 (5452): Command: VBoxManage -q modifyvm "boinc_e906384cb35d1784" --usb off Exit Code: 0 Output: 2025-06-03 00:01:50 (5452): Command: VBoxManage -q modifyvm "boinc_e906384cb35d1784" --uart1 off --uart2 off Exit Code: 0 Output: 2025-06-03 00:01:50 (5452): Command: VBoxManage -q modifyvm "boinc_e906384cb35d1784" --lpt1 off --lpt2 off Exit Code: 0 Output: 2025-06-03 00:01:51 (5452): Command: VBoxManage -q modifyvm "boinc_e906384cb35d1784" --audio none Exit Code: 0 Output: Warning: --audio is deprecated and will be removed soon. Use --audio-driver instead! 2025-06-03 00:01:51 (5452): Command: VBoxManage -q modifyvm "boinc_e906384cb35d1784" --clipboard disabled Exit Code: 0 Output: 2025-06-03 00:01:51 (5452): Command: VBoxManage -q modifyvm "boinc_e906384cb35d1784" --draganddrop disabled Exit Code: 0 Output: 2025-06-03 00:01:52 (5452): Command: VBoxManage -q storagectl "boinc_e906384cb35d1784" --name "Hard Disk Controller" --add "sata" --controller "IntelAHCI" --hostiocache off --portcount 3 Exit Code: 0 Output: 2025-06-03 00:01:52 (5452): Command: VBoxManage -q showhdinfo "C:\ProgramData\BOINC\DATA/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\DATA\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 2025-06-03 00:01:52 (5452): Command: VBoxManage -q storageattach "boinc_e906384cb35d1784" --storagectl "Hard Disk Controller" --port 0 --device 0 --type hdd --mtype multiattach --medium "C:\ProgramData\BOINC\DATA/projects/lhcathome.cern.ch_lhcathome/ATLAS_vbox_3.01_image.vdi" Exit Code: -2135228409 Output: VBoxManage.exe: error: Cannot attach medium 'C:\ProgramData\BOINC\DATA\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 2025-06-03 00:01:52 (5452): Command: VBoxManage -q closemedium "C:\ProgramData\BOINC\DATA/projects/lhcathome.cern.ch_lhcathome/ATLAS_vbox_3.01_image.vdi" Exit Code: 0 Output: 2025-06-03 00:01:54 (5452): Command: VBoxManage -q showhdinfo "C:\ProgramData\BOINC\DATA/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\DATA\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 2025-06-03 00:01:54 (5452): Command: VBoxManage -q storageattach "boinc_e906384cb35d1784" --storagectl "Hard Disk Controller" --port 0 --device 0 --type hdd --medium "C:\ProgramData\BOINC\DATA/projects/lhcathome.cern.ch_lhcathome/ATLAS_vbox_3.01_image.vdi" Exit Code: 0 Output: 2025-06-03 00:01:54 (5452): Command: VBoxManage -q storageattach "boinc_e906384cb35d1784" --storagectl "Hard Disk Controller" --port 0 --device 0 --type hdd --medium none Exit Code: 0 Output: 2025-06-03 00:01:54 (5452): Command: VBoxManage -q storageattach "boinc_e906384cb35d1784" --storagectl "Hard Disk Controller" --port 0 --device 0 --type hdd --mtype multiattach --medium "C:\ProgramData\BOINC\DATA/projects/lhcathome.cern.ch_lhcathome/ATLAS_vbox_3.01_image.vdi" Exit Code: 0 Output: 2025-06-03 00:01:55 (5452): Command: VBoxManage -q storageattach "boinc_e906384cb35d1784" --storagectl "Hard Disk Controller" --port 1 --device 0 --type dvddrive --medium "C:\Program Files\Oracle\VirtualBox/VBoxGuestAdditions.iso" Exit Code: 0 Output: 2025-06-03 00:01:55 (5452): Command: VBoxManage -q bandwidthctl "boinc_e906384cb35d1784" add "boinc_e906384cb35d1784_net" --type network --limit 1024G Exit Code: 0 Output: 2025-06-03 00:01:55 (5452): Command: VBoxManage -q modifyvm "boinc_e906384cb35d1784" --natpf1 ",tcp,127.0.0.1,56749,,80" Exit Code: 0 Output: 2025-06-03 00:01:55 (5452): Command: VBoxManage -q list extpacks Exit Code: 0 Output: Extension Packs: 1 Pack no. 0: Oracle VirtualBox Extension Pack Version: 7.1.8 Revision: 168469 Edition: Description: Oracle Cloud Infrastructure integration, Host Webcam, VirtualBox RDP, PXE ROM, Disk Encryption, NVMe, full VM encryption. VRDE Module: VBoxVRDP Crypto Module: VBoxPuelCrypto Usable: true Why unusable: 2025-06-03 00:01:56 (5452): Command: VBoxManage -q sharedfolder add "boinc_e906384cb35d1784" --name "shared" --hostpath "C:\ProgramData\BOINC\DATA\slots\1/shared" Exit Code: 0 Output: 2025-06-03 00:01:57 (5452): Command: VBoxManage -q startvm "boinc_e906384cb35d1784" --type headless Exit Code: 1 Output: VBoxManage.exe: error: The virtual machine 'boinc_e906384cb35d1784' has terminated unexpectedly during startup with exit code 1 (0x1). More details may be available in 'C:\ProgramData\BOINC\DATA\slots\1\boinc_e906384cb35d1784\Logs\VBoxHardening.log' VBoxManage.exe: error: Details: code E_FAIL (0x80004005), component MachineWrap, interface IMachine Waiting for VM "boinc_e906384cb35d1784" to power on... 2025-06-03 00:01:57 (5452): Command: VBoxManage -q snapshot "boinc_e906384cb35d1784" list Exit Code: -108 Output: This machine does not have any snapshots 2025-06-03 00:01:57 (5452): Command: VBoxManage -q bandwidthctl "boinc_e906384cb35d1784" remove "boinc_e906384cb35d1784_net" Exit Code: 0 Output: 2025-06-03 00:01:58 (5452): Command: VBoxManage -q unregistervm "boinc_e906384cb35d1784" --delete Exit Code: 0 Output: 0%...10%...20%...30%...40%...50%...60%...70%...80%...90%...100% 00:02:03 (5452): called boinc_finish(1) </stderr_txt> ]]>
©2025 CERN