Name | Theory_2843-4292902-523_2 |
Workunit | 230797008 |
Created | 14 Mar 2025, 17:05:18 UTC |
Sent | 14 Mar 2025, 23:48:58 UTC |
Report deadline | 25 Mar 2025, 23:48:58 UTC |
Received | 14 Mar 2025, 23:59:58 UTC |
Server state | Over |
Outcome | Computation error |
Client state | Compute error |
Exit status | -2147467259 (0x80004005) Unknown error code |
Computer ID | 10825113 |
Run time | 24 sec |
CPU time | |
Validate state | Invalid |
Credit | 0.00 |
Device peak FLOPS | 3.66 GFLOPS |
Application version | Theory Simulation v300.60 (vbox64_theory) windows_x86_64 |
Peak working set size | 11.73 MB |
Peak swap size | 6.22 MB |
Peak disk usage | 1.42 MB |
<core_client_version>8.0.2</core_client_version> <![CDATA[ <message> Error no especificado (0x80004005) - exit code 2147500037 (0x80004005)</message> <stderr_txt> 2025-03-15 00:49:03 (7852): vboxwrapper version 26208 2025-03-15 00:49:03 (7852): BOINC client version: 8.0.2 2025-03-15 00:49:03 (7852): Detected: VirtualBox VboxManage Interface (Version: 6.1.18) 2025-03-15 00:49:04 (7852): Detected: Heartbeat check (file: 'heartbeat' every 1200.000000 seconds) 2025-03-15 00:49:04 (7852): Successfully copied 'init_data.xml' to the shared directory. 2025-03-15 00:49:04 (7852): Successfully copied 'input' to the shared directory. 2025-03-15 00:49:04 (7852): Create VM. (boinc_32d2712def8d2d59, slot#2) 2025-03-15 00:49:05 (7852): Setting Memory Size for VM. (630MB) 2025-03-15 00:49:05 (7852): Setting CPU Count for VM. (1) 2025-03-15 00:49:05 (7852): Setting Chipset Options for VM. 2025-03-15 00:49:05 (7852): Setting Graphics Controller Options for VM. 2025-03-15 00:49:06 (7852): Setting Boot Options for VM. 2025-03-15 00:49:06 (7852): Setting Network Configuration for NAT. 2025-03-15 00:49:06 (7852): Enabling VM Network Access. 2025-03-15 00:49:06 (7852): Disabling USB Support for VM. 2025-03-15 00:49:07 (7852): Disabling COM Port Support for VM. 2025-03-15 00:49:07 (7852): Disabling LPT Port Support for VM. 2025-03-15 00:49:07 (7852): Disabling Audio Support for VM. 2025-03-15 00:49:07 (7852): Disabling Clipboard Support for VM. 2025-03-15 00:49:08 (7852): Disabling Drag and Drop Support for VM. 2025-03-15 00:49:08 (7852): Adding storage controller(s) to VM. 2025-03-15 00:49:08 (7852): Adding virtual disk drive to VM. (Theory_2025_01_16_prod.vdi) 2025-03-15 00:49:11 (7852): Attempts: 2 2025-03-15 00:49:11 (7852): Adding VirtualBox Guest Additions to VM. 2025-03-15 00:49:12 (7852): Adding network bandwidth throttle group to VM. (Defaulting to 1024GB) 2025-03-15 00:49:12 (7852): forwarding host port 51888 to guest port 80 2025-03-15 00:49:12 (7852): Enabling remote desktop for VM. 2025-03-15 00:49:13 (7852): Enabling shared directory for VM. 2025-03-15 00:49:13 (7852): Starting VM using VBoxManage interface. (boinc_32d2712def8d2d59, slot#2) 2025-03-15 00:49:16 (7852): Error in start VM for VM: -2147467259 Command: VBoxManage -q startvm "boinc_32d2712def8d2d59" --type headless Output: Waiting for VM "boinc_32d2712def8d2d59" to power on... 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 2025-03-15 00:49:16 (7852): VM failed to start. 2025-03-15 00:49:16 (7852): Could not start 2025-03-15 00:49:16 (7852): ERROR: VM failed to start 2025-03-15 00:49:16 (7852): Powering off VM. 2025-03-15 00:49:16 (7852): Deregistering VM. (boinc_32d2712def8d2d59, slot#2) 2025-03-15 00:49:16 (7852): Removing network bandwidth throttle group from VM. 2025-03-15 00:49:17 (7852): Removing VM from VirtualBox. Hypervisor System Log: 00:00:10.998729 ERROR [COM]: aRC=E_FAIL (0x80004005) aIID={85632c68-b5bb-4316-a900-5eb28d3413df} aComponent={SessionMachine} aText={This machine does not have any snapshots}, preserve=false aResultDetail=0 00:00:11.024295 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 00:00:11.024792 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 00:00:11.026445 Saving settings file "C:\ProgramData\BOINC\slots\3\boinc_73b106575f9f98d3\boinc_73b106575f9f98d3.vbox" with version "1.16-windows" 00:00:11.031250 Saving settings file "C:\ProgramData\BOINC\slots\1\boinc_b334229109b3b717\boinc_b334229109b3b717.vbox" with version "1.16-windows" 00:00:11.035331 Saving settings file "C:\ProgramData\BOINC\slots\3\boinc_73b106575f9f98d3\boinc_73b106575f9f98d3.vbox" with version "1.16-windows" 00:00:11.205990 Launched VM: 67905808 pid: 13432 (0x3478) frontend: headless name: boinc_32d2712def8d2d59 00:00:11.310266 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 00:00:11.310701 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 00:00:11.311313 Saving settings file "C:\ProgramData\BOINC\slots\3\boinc_73b106575f9f98d3\boinc_73b106575f9f98d3.vbox" with version "1.16-windows" 00:00:11.363563 Saving settings file "C:\ProgramData\BOINC\slots\1\boinc_b334229109b3b717\boinc_b334229109b3b717.vbox" with version "1.16-windows" 00:00:11.430357 ERROR [COM]: aRC=E_FAIL (0x80004005) aIID={85632c68-b5bb-4316-a900-5eb28d3413df} aComponent={SessionMachine} aText={This machine does not have any snapshots}, preserve=false aResultDetail=0 00:00:11.620275 Saving settings file "C:\ProgramData\BOINC\slots\3\boinc_73b106575f9f98d3\boinc_73b106575f9f98d3.vbox" with version "1.16-windows" 00:00:11.757815 ERROR [COM]: aRC=VBOX_E_INVALID_OBJECT_STATE (0x80bb0007) aIID={85632c68-b5bb-4316-a900-5eb28d3413df} aComponent={MachineWrap} aText={Cannot unregister the machine 'boinc_b334229109b3b717' while it is locked}, preserve=false aResultDetail=0 00:00:11.886750 Saving settings file "C:\ProgramData\BOINC\slots\3\boinc_73b106575f9f98d3\boinc_73b106575f9f98d3.vbox" with version "1.16-windows" 00:00:12.419993 Saving settings file "C:\ProgramData\BOINC\slots\3\boinc_73b106575f9f98d3\boinc_73b106575f9f98d3.vbox" with version "1.16-windows" 00:00:12.682870 Saving settings file "C:\ProgramData\BOINC\slots\3\boinc_73b106575f9f98d3\boinc_73b106575f9f98d3.vbox" with version "1.16-windows" 00:00:12.874730 Saving settings file "C:\ProgramData\BOINC\slots\0\boinc_8249d08dea9e12fc\boinc_8249d08dea9e12fc.vbox" with version "1.16-windows" 00:00:12.957586 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 00:00:12.957743 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 00:00:12.961477 ERROR [COM]: aRC=E_FAIL (0x80004005) aIID={85632c68-b5bb-4316-a900-5eb28d3413df} aComponent={SessionMachine} aText={This machine does not have any snapshots}, preserve=false aResultDetail=0 00:00:12.991947 ERROR [COM]: aRC=E_FAIL (0x80004005) aIID={85632c68-b5bb-4316-a900-5eb28d3413df} aComponent={SessionMachine} aText={This machine does not have any snapshots}, preserve=false aResultDetail=0 00:00:13.022432 Saving settings file "C:\Users\us_022_057\.VirtualBox\VirtualBox.xml" with version "1.12-windows" 00:00:13.027085 Saving settings file "C:\ProgramData\BOINC\slots\0\boinc_8249d08dea9e12fc\boinc_8249d08dea9e12fc.vbox" with version "1.16-windows" 00:00:13.032486 DeleteVM Saving settings file "C:\ProgramData\BOINC\slots\0\boinc_8249d08dea9e12fc\boinc_8249d08dea9e12fc.vbox" with version "1.16-windows" 00:00:13.208125 Launched VM: 67456160 pid: 14212 (0x3784) frontend: headless name: boinc_73b106575f9f98d3 00:00:13.324583 Saving settings file "C:\Users\us_022_057\.VirtualBox\VirtualBox.xml" with version "1.12-windows" 00:00:13.328994 Saving settings file "C:\ProgramData\BOINC\slots\2\boinc_32d2712def8d2d59\boinc_32d2712def8d2d59.vbox" with version "1.16-windows" 00:00:13.344341 DeleteVM Saving settings file "C:\ProgramData\BOINC\slots\2\boinc_32d2712def8d2d59\boinc_32d2712def8d2d59.vbox" with version "1.16-windows" 00:00:14.156544 Saving settings file "C:\ProgramData\BOINC\slots\2\boinc_32d2712def8d2d59\boinc_32d2712def8d2d59.vbox" with version "1.16-windows" 00:00:14.232278 ERROR [COM]: aRC=E_FAIL (0x80004005) aIID={85632c68-b5bb-4316-a900-5eb28d3413df} aComponent={SessionMachine} aText={This machine does not have any snapshots}, preserve=false aResultDetail=0 00:00:14.550191 ERROR [COM]: aRC=VBOX_E_INVALID_OBJECT_STATE (0x80bb0007) aIID={85632c68-b5bb-4316-a900-5eb28d3413df} aComponent={MachineWrap} aText={Cannot unregister the machine 'boinc_32d2712def8d2d59' while it is locked}, preserve=false aResultDetail=0 00:00:15.818880 Saving settings file "C:\Users\us_022_057\.VirtualBox\VirtualBox.xml" with version "1.12-windows" 00:00:15.823913 Saving settings file "C:\ProgramData\BOINC\slots\3\boinc_73b106575f9f98d3\boinc_73b106575f9f98d3.vbox" with version "1.16-windows" 00:00:15.828811 DeleteVM Saving settings file "C:\ProgramData\BOINC\slots\3\boinc_73b106575f9f98d3\boinc_73b106575f9f98d3.vbox" with version "1.16-windows" 00:00:16.114211 Saving settings file "C:\ProgramData\BOINC\slots\3\boinc_73b106575f9f98d3\boinc_73b106575f9f98d3.vbox" with version "1.16-windows" 00:00:16.194268 ERROR [COM]: aRC=E_FAIL (0x80004005) aIID={85632c68-b5bb-4316-a900-5eb28d3413df} aComponent={SessionMachine} aText={This machine does not have any snapshots}, preserve=false aResultDetail=0 00:00:16.510642 ERROR [COM]: aRC=VBOX_E_INVALID_OBJECT_STATE (0x80bb0007) aIID={85632c68-b5bb-4316-a900-5eb28d3413df} aComponent={MachineWrap} aText={Cannot unregister the machine 'boinc_73b106575f9f98d3' while it is locked}, preserve=false aResultDetail=0 00:00:17.791457 Saving settings file "C:\Users\us_022_057\.VirtualBox\VirtualBox.xml" with version "1.12-windows" 00:00:22.795731 main VirtualBox: object deletion starts 00:00:22.795839 main ERROR [COM]: aRC=VBOX_E_OBJECT_IN_USE (0x80bb000c) aIID={ad47ad09-787b-44ab-b343-a082a3f2dfb1} aComponent={MediumWrap} aText={Medium 'C:\Users\us_022_057\VirtualBox VMs\10vir\10vir.vdi' cannot be closed because it is still attached to 1 virtual machines}, preserve=false aResultDetail=0 00:00:22.797088 main HostDnsMonitor: shutting down ... 00:00:22.797120 main HostDnsMonitor: shut down 00:00:22.799979 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 00:00:22.800271 main VirtualBox: object deleted VM Execution Log: VM Startup Log: VM Trace Log: System Proxy URL: 2025-03-15 00:49:04 (7852): Command: VBoxManage -q list hostinfo Exit Code: 0 Output: Host Information: Host time: 2025-03-14T23:49:03.935000000Z Processor online count: 4 Processor count: 4 Processor online core count: 4 Processor core count: 4 Processor supports HW virtualization: no Processor supports PAE: yes Processor supports long mode: yes Processor supports nested paging: no Processor supports unrestricted guest: no Processor supports nested HW virtualization: no Processor#0 speed: unknown Processor#0 description: Intel(R) Core(TM) i5-6400 CPU @ 2.70GHz Processor#1 speed: unknown Processor#1 description: Intel(R) Core(TM) i5-6400 CPU @ 2.70GHz Processor#2 speed: unknown Processor#2 description: Intel(R) Core(TM) i5-6400 CPU @ 2.70GHz Processor#3 speed: unknown Processor#3 description: Intel(R) Core(TM) i5-6400 CPU @ 2.70GHz Memory size: 12144 MByte Memory available: 5139 MByte Operating system: Windows 10 Operating system version: 10.0.19045 2025-03-15 00:49:04 (7852): Command: VBoxManage -q showvminfo "boinc_32d2712def8d2d59" --machinereadable Exit Code: -2135228415 Output: VBoxManage.exe: error: Could not find a registered machine named 'boinc_32d2712def8d2d59' 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 2715 of file VBoxManageInfo.cpp 2025-03-15 00:49:04 (7852): Command: VBoxManage -q createvm --name "boinc_32d2712def8d2d59" --basefolder "C:\ProgramData\BOINC\slots\2" --ostype "Linux26_64" --register Exit Code: 0 Output: Virtual machine 'boinc_32d2712def8d2d59' is created and registered. UUID: a4ae81d0-53d7-40cd-be05-33b835f249e1 Settings file: 'C:\ProgramData\BOINC\slots\2\boinc_32d2712def8d2d59\boinc_32d2712def8d2d59.vbox' 2025-03-15 00:49:05 (7852): Command: VBoxManage -q modifyvm "boinc_32d2712def8d2d59" --description "Theory_2843-4292902-523_2" Exit Code: 0 Output: 2025-03-15 00:49:05 (7852): Command: VBoxManage -q modifyvm "boinc_32d2712def8d2d59" --memory 630 Exit Code: 0 Output: 2025-03-15 00:49:05 (7852): Command: VBoxManage -q modifyvm "boinc_32d2712def8d2d59" --cpus 1 Exit Code: 0 Output: 2025-03-15 00:49:05 (7852): Command: VBoxManage -q modifyvm "boinc_32d2712def8d2d59" --acpi on --ioapic on --rtcuseutc off Exit Code: 0 Output: 2025-03-15 00:49:06 (7852): Command: VBoxManage -q modifyvm "boinc_32d2712def8d2d59" --vram 16 --graphicscontroller VBoxVGA Exit Code: 0 Output: 2025-03-15 00:49:06 (7852): Command: VBoxManage -q modifyvm "boinc_32d2712def8d2d59" --boot1 disk --boot2 dvd --boot3 none --boot4 none Exit Code: 0 Output: 2025-03-15 00:49:06 (7852): Command: VBoxManage -q modifyvm "boinc_32d2712def8d2d59" --nic1 nat --natdnsproxy1 on --cableconnected1 off Exit Code: 0 Output: 2025-03-15 00:49:06 (7852): Command: VBoxManage -q modifyvm "boinc_32d2712def8d2d59" --cableconnected1 on Exit Code: 0 Output: 2025-03-15 00:49:07 (7852): Command: VBoxManage -q modifyvm "boinc_32d2712def8d2d59" --usb off Exit Code: 0 Output: 2025-03-15 00:49:07 (7852): Command: VBoxManage -q modifyvm "boinc_32d2712def8d2d59" --uart1 off --uart2 off Exit Code: 0 Output: 2025-03-15 00:49:07 (7852): Command: VBoxManage -q modifyvm "boinc_32d2712def8d2d59" --lpt1 off --lpt2 off Exit Code: 0 Output: 2025-03-15 00:49:07 (7852): Command: VBoxManage -q modifyvm "boinc_32d2712def8d2d59" --audio none Exit Code: 0 Output: 2025-03-15 00:49:08 (7852): Command: VBoxManage -q modifyvm "boinc_32d2712def8d2d59" --clipboard disabled Exit Code: 0 Output: 2025-03-15 00:49:08 (7852): Command: VBoxManage -q modifyvm "boinc_32d2712def8d2d59" --draganddrop disabled Exit Code: 0 Output: 2025-03-15 00:49:08 (7852): Command: VBoxManage -q storagectl "boinc_32d2712def8d2d59" --name "Hard Disk Controller" --add "sata" --controller "IntelAHCI" --hostiocache off --portcount 3 Exit Code: 0 Output: 2025-03-15 00:49:11 (7852): Command: VBoxManage -q showhdinfo "C:\ProgramData\BOINC/projects/lhcathome.cern.ch_lhcathome/Theory_2025_01_16_prod.vdi" Exit Code: 0 Output: UUID: 6a4110e9-e559-4c1c-bfd2-ba6f6aaf4169 Parent UUID: base State: created Type: multiattach Location: C:\ProgramData\BOINC\projects\lhcathome.cern.ch_lhcathome\Theory_2025_01_16_prod.vdi Storage format: VDI Format variant: dynamic default Capacity: 20480 MBytes Size on disk: 781 MBytes Encryption: disabled Property: AllocationBlockSize=1048576 Child UUIDs: 02021a78-7cc9-4006-9849-61292d8a4c83 4e0c879f-50aa-48f0-8436-f00f5c57086d 2025-03-15 00:49:11 (7852): Command: VBoxManage -q storageattach "boinc_32d2712def8d2d59" --storagectl "Hard Disk Controller" --port 0 --device 0 --type hdd --mtype multiattach --medium "C:\ProgramData\BOINC/projects/lhcathome.cern.ch_lhcathome/Theory_2025_01_16_prod.vdi" Exit Code: 0 Output: 2025-03-15 00:49:12 (7852): Command: VBoxManage -q storageattach "boinc_32d2712def8d2d59" --storagectl "Hard Disk Controller" --port 1 --device 0 --type dvddrive --medium "C:\Program Files\Oracle\VirtualBox/VBoxGuestAdditions.iso" Exit Code: 0 Output: 2025-03-15 00:49:12 (7852): Command: VBoxManage -q bandwidthctl "boinc_32d2712def8d2d59" add "boinc_32d2712def8d2d59_net" --type network --limit 1024G Exit Code: 0 Output: 2025-03-15 00:49:12 (7852): Command: VBoxManage -q modifyvm "boinc_32d2712def8d2d59" --natpf1 ",tcp,127.0.0.1,51888,,80" Exit Code: 0 Output: 2025-03-15 00:49:12 (7852): Command: VBoxManage -q list extpacks Exit Code: 0 Output: Extension Packs: 1 Pack no. 0: Oracle VM VirtualBox Extension Pack Version: 6.1.18 Revision: 142142 Edition: Description: Oracle Cloud Infrastructure integration, USB 2.0 and USB 3.0 Host Controller, Host Webcam, VirtualBox RDP, PXE ROM, Disk Encryption, NVMe. VRDE Module: VBoxVRDP Usable: true Why unusable: 2025-03-15 00:49:13 (7852): Command: VBoxManage -q modifyvm "boinc_32d2712def8d2d59" --vrde on --vrdeextpack default --vrdeauthlibrary default --vrdeauthtype null --vrdeport 51889 Exit Code: 0 Output: 2025-03-15 00:49:13 (7852): Command: VBoxManage -q sharedfolder add "boinc_32d2712def8d2d59" --name "shared" --hostpath "C:\ProgramData\BOINC\slots\2/shared" Exit Code: 0 Output: 2025-03-15 00:49:16 (7852): Command: VBoxManage -q startvm "boinc_32d2712def8d2d59" --type headless Exit Code: -2147467259 Output: Waiting for VM "boinc_32d2712def8d2d59" to power on... 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 2025-03-15 00:49:16 (7852): Command: VBoxManage -q snapshot "boinc_32d2712def8d2d59" list Exit Code: -108 Output: This machine does not have any snapshots 2025-03-15 00:49:17 (7852): Command: VBoxManage -q bandwidthctl "boinc_32d2712def8d2d59" remove "boinc_32d2712def8d2d59_net" Exit Code: 0 Output: VBoxManage.exe: error: Bandwidth groups cannot be deleted while the VM is running 2025-03-15 00:49:17 (7852): Command: VBoxManage -q unregistervm "boinc_32d2712def8d2d59" --delete Exit Code: -2135228409 Output: VBoxManage.exe: error: Cannot unregister the machine 'boinc_32d2712def8d2d59' 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(CleanupMode_DetachAllReturnHardDisksOnly, ComSafeArrayAsOutParam(aMedia))" at line 154 of file VBoxManageMisc.cpp 2025-03-15 00:49:18 (7852): Command: VBoxManage -q unregistervm "boinc_32d2712def8d2d59" --delete Exit Code: 0 Output: 0%...10%...20%...30%...40%...50%...60%...70%...80%...90%...100% 2025-03-15 00:49:25 (7852): called boinc_finish(-2147467259) </stderr_txt> ]]>
©2025 CERN