Name | 08371021_49_2 |
Workunit | 8214848 |
Created | 15 Jun 2021, 10:22:20 UTC |
Sent | 15 Jun 2021, 10:41:43 UTC |
Report deadline | 20 Jun 2021, 10:41:43 UTC |
Received | 17 Jun 2021, 19:53:32 UTC |
Server state | Over |
Outcome | Computation error |
Client state | Compute error |
Exit status | 197 (0x000000C5) EXIT_TIME_LIMIT_EXCEEDED |
Computer ID | 9383 |
Run time | 2 hours 13 min 28 sec |
CPU time | 2 sec |
Validate state | Invalid |
Credit | 0.00 |
Device peak FLOPS | 4.09 GFLOPS |
Application version | boinc2docker v1.14 (vbox64_mt) windows_x86_64 |
Peak working set size | 90.38 MB |
Peak swap size | 92.68 MB |
Peak disk usage | 499.13 MB |
<core_client_version>7.16.11</core_client_version> <![CDATA[ <message> exceeded elapsed time limit 7993.66 (86400.00G/10.81G)</message> <stderr_txt> 2021-06-17 12:43:24 (9688): Detected: vboxwrapper 26202 2021-06-17 12:43:24 (9688): Detected: BOINC client v7.16.11 2021-06-17 12:43:25 (9688): Detected: VirtualBox VboxManage Interface (Version: 6.0.14) 2021-06-17 12:43:26 (9688): Create VM. (boinc_a42bf106eafc20d9, slot#2) 2021-06-17 12:43:26 (9688): Updating drive controller type and model for desired configuration. 2021-06-17 12:43:27 (9688): Setting Memory Size for VM. (3072MB) 2021-06-17 12:43:27 (9688): Setting CPU Count for VM. (1) 2021-06-17 12:43:27 (9688): Setting Chipset Options for VM. 2021-06-17 12:43:27 (9688): Setting Boot Options for VM. 2021-06-17 12:43:28 (9688): Setting Network Configuration for NAT. 2021-06-17 12:43:28 (9688): Enabling VM Network Access. 2021-06-17 12:43:28 (9688): Disabling USB Support for VM. 2021-06-17 12:43:28 (9688): Disabling COM Port Support for VM. 2021-06-17 12:43:29 (9688): Disabling LPT Port Support for VM. 2021-06-17 12:43:29 (9688): Disabling Audio Support for VM. 2021-06-17 12:43:29 (9688): Disabling Clipboard Support for VM. 2021-06-17 12:43:30 (9688): Disabling Drag and Drop Support for VM. 2021-06-17 12:43:30 (9688): Adding storage controller(s) to VM. 2021-06-17 12:43:30 (9688): Adding virtual ISO 9660 disk drive to VM. (vm_isocontext.iso) 2021-06-17 12:43:30 (9688): Adding VirtualBox Guest Additions to VM. 2021-06-17 12:43:31 (9688): Adding network bandwidth throttle group to VM. (Defaulting to 1024GB) 2021-06-17 12:43:31 (9688): Enabling shared directory for VM. 2021-06-17 12:43:31 (9688): Starting VM using VBoxManage interface. (boinc_a42bf106eafc20d9, slot#2) 2021-06-17 12:43:36 (9688): Successfully started VM. (PID = '14392') 2021-06-17 12:43:36 (9688): Reporting VM Process ID to BOINC. 2021-06-17 12:43:36 (9688): Guest Log: BIOS: VirtualBox 6.0.14 2021-06-17 12:43:36 (9688): Guest Log: CPUID EDX: 0x178bf3ff 2021-06-17 12:43:36 (9688): VM state change detected. (old = 'poweredoff', new = 'running') 2021-06-17 12:43:36 (9688): Preference change detected 2021-06-17 12:43:36 (9688): Setting CPU throttle for VM. (100%) 2021-06-17 12:43:36 (9688): Setting checkpoint interval to 600 seconds. (Higher value of (Preference: 60 seconds) or (Vbox_job.xml: 600 seconds)) 2021-06-17 12:43:38 (9688): Guest Log: BIOS: Boot : bseqnr=1, bootseq=0032 2021-06-17 12:43:38 (9688): Guest Log: int13_harddisk: function 02, unmapped device for ELDL=80 2021-06-17 12:43:38 (9688): Guest Log: BIOS: Boot from Hard Disk 0 failed 2021-06-17 12:43:38 (9688): Guest Log: BIOS: Boot : bseqnr=2, bootseq=0003 2021-06-17 12:43:38 (9688): Guest Log: BIOS: Booting from CD-ROM... 2021-06-17 14:23:40 (9688): Status Report: Elapsed Time: '6000.000000' 2021-06-17 14:23:40 (9688): Status Report: CPU Time: '2.593750' 2021-06-17 14:56:39 (9688): Powering off VM. 2021-06-17 14:56:40 (9688): Successfully stopped VM. 2021-06-17 14:56:40 (9688): Deregistering VM. (boinc_a42bf106eafc20d9, slot#2) 2021-06-17 14:56:40 (9688): Removing network bandwidth throttle group from VM. 2021-06-17 14:56:40 (9688): Removing VM from VirtualBox. 2021-06-17 14:56:40 (9688): Removing virtual ISO 9660 disk from VirtualBox. Hypervisor System Log: 47:38:02.336458 ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={5047460a-265d-4538-b23e-ddba5fb84976} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0 47:38:02.336515 ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={5047460a-265d-4538-b23e-ddba5fb84976} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0 47:38:02.336570 ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={5047460a-265d-4538-b23e-ddba5fb84976} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0 47:38:02.336625 ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={5047460a-265d-4538-b23e-ddba5fb84976} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0 47:38:02.336680 ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={5047460a-265d-4538-b23e-ddba5fb84976} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0 47:38:02.336765 ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={5047460a-265d-4538-b23e-ddba5fb84976} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0 47:38:02.336817 ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={5047460a-265d-4538-b23e-ddba5fb84976} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0 47:38:02.336868 ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={5047460a-265d-4538-b23e-ddba5fb84976} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0 47:38:02.336917 ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={5047460a-265d-4538-b23e-ddba5fb84976} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0 47:38:02.336970 ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={5047460a-265d-4538-b23e-ddba5fb84976} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0 47:38:02.337023 ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={5047460a-265d-4538-b23e-ddba5fb84976} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0 47:38:02.337075 ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={5047460a-265d-4538-b23e-ddba5fb84976} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0 47:38:02.337124 ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={5047460a-265d-4538-b23e-ddba5fb84976} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0 47:38:02.337176 ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={5047460a-265d-4538-b23e-ddba5fb84976} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0 47:38:02.337233 ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={5047460a-265d-4538-b23e-ddba5fb84976} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0 47:38:02.337282 ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={5047460a-265d-4538-b23e-ddba5fb84976} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0 47:38:02.337331 ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={5047460a-265d-4538-b23e-ddba5fb84976} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0 47:38:02.337829 Saving settings file "C:\Users\D-PC\.VirtualBox\VirtualBox.xml" with version "1.12-windows" 47:38:02.608971 ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={5047460a-265d-4538-b23e-ddba5fb84976} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0 47:38:02.609112 ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={5047460a-265d-4538-b23e-ddba5fb84976} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0 47:38:02.609187 ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={5047460a-265d-4538-b23e-ddba5fb84976} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0 47:38:02.609247 ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={5047460a-265d-4538-b23e-ddba5fb84976} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0 47:38:02.609306 ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={5047460a-265d-4538-b23e-ddba5fb84976} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0 47:38:02.609363 ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={5047460a-265d-4538-b23e-ddba5fb84976} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0 47:38:02.609418 ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={5047460a-265d-4538-b23e-ddba5fb84976} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0 47:38:02.609473 ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={5047460a-265d-4538-b23e-ddba5fb84976} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0 47:38:02.609527 ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={5047460a-265d-4538-b23e-ddba5fb84976} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0 47:38:02.609579 ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={5047460a-265d-4538-b23e-ddba5fb84976} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0 47:38:02.609629 ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={5047460a-265d-4538-b23e-ddba5fb84976} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0 47:38:02.609686 ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={5047460a-265d-4538-b23e-ddba5fb84976} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0 47:38:02.609739 ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={5047460a-265d-4538-b23e-ddba5fb84976} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0 47:38:02.609790 ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={5047460a-265d-4538-b23e-ddba5fb84976} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0 47:38:02.609840 ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={5047460a-265d-4538-b23e-ddba5fb84976} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0 47:38:02.609891 ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={5047460a-265d-4538-b23e-ddba5fb84976} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0 47:38:02.609940 ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={5047460a-265d-4538-b23e-ddba5fb84976} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0 47:38:02.609990 ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={5047460a-265d-4538-b23e-ddba5fb84976} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0 47:38:02.610039 ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={5047460a-265d-4538-b23e-ddba5fb84976} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0 47:38:02.610088 ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={5047460a-265d-4538-b23e-ddba5fb84976} aComponent={MachineWrap} aText={The object functionality is limited}, preserve=false aResultDetail=0 VM Execution Log: VM Startup Log: VM Trace Log: Controllers: 8 Maximum NVMe Port count: 255 Maximum Devices per NVMe Port: 1 Maximum PIIX3 Floppy Controllers:1 Maximum ICH9 Floppy Controllers: 1 Maximum Floppy Port count: 1 Maximum Devices per Floppy Port: 2 Default machine folder: C:\Users\D-PC\VirtualBox VMs Raw-mode Supported: yes Exclusive HW virtualization use: off Default hard disk format: VDI VRDE auth library: VBoxAuth Webservice auth. library: VBoxAuth Remote desktop ExtPack: Log history count: 3 Default frontend: Default audio driver: DirectSound Autostart database path: Default Guest Additions ISO: C:\Program Files\Oracle\VirtualBox/VBoxGuestAdditions.iso Logging Level: all Proxy Mode: System Proxy URL: 2021-06-17 12:43:26 (9688): Command: VBoxManage -q list hostinfo Exit Code: 0 Output: Host Information: Host time: 2021-06-17T16:43:25.877000000Z Processor online count: 12 Processor count: 12 Processor online core count: 6 Processor core count: 6 Processor supports HW virtualization: no Processor supports PAE: yes Processor supports long mode: yes Processor supports nested paging: no Processor#0 speed: unknown Processor#0 description: AMD Ryzen 5 1600 Six-Core Processor Processor#1 speed: unknown Processor#1 description: AMD Ryzen 5 1600 Six-Core Processor Processor#2 speed: unknown Processor#2 description: AMD Ryzen 5 1600 Six-Core Processor Processor#3 speed: unknown Processor#3 description: AMD Ryzen 5 1600 Six-Core Processor Processor#4 speed: unknown Processor#4 description: AMD Ryzen 5 1600 Six-Core Processor Processor#5 speed: unknown Processor#5 description: AMD Ryzen 5 1600 Six-Core Processor Processor#6 speed: unknown Processor#6 description: AMD Ryzen 5 1600 Six-Core Processor Processor#7 speed: unknown Processor#7 description: AMD Ryzen 5 1600 Six-Core Processor Processor#8 speed: unknown Processor#8 description: AMD Ryzen 5 1600 Six-Core Processor Processor#9 speed: unknown Processor#9 description: AMD Ryzen 5 1600 Six-Core Processor Processor#10 speed: unknown Processor#10 description: AMD Ryzen 5 1600 Six-Core Processor Processor#11 speed: unknown Processor#11 description: AMD Ryzen 5 1600 Six-Core Processor Memory size: 16332 MByte Memory available: 10129 MByte Operating system: Windows 10 Operating system version: 10.0.19042 2021-06-17 12:43:26 (9688): Command: VBoxManage -q showvminfo "boinc_a42bf106eafc20d9" --machinereadable Exit Code: -2135228415 Output: VBoxManage.exe: error: Could not find a registered machine named 'boinc_a42bf106eafc20d9' 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 2021-06-17 12:43:26 (9688): Command: VBoxManage -q showhdinfo "C:\ProgramData\BOINC\slots\2/vm_image.vdi" Exit Code: -2135228412 Output: VBoxManage.exe: error: Could not find file for the medium 'C:\ProgramData\BOINC\slots\2\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 2021-06-17 12:43:26 (9688): Command: VBoxManage -q createvm --name "boinc_a42bf106eafc20d9" --basefolder "C:\ProgramData\BOINC\slots\2" --ostype "Linux26_64" --register Exit Code: 0 Output: Virtual machine 'boinc_a42bf106eafc20d9' is created and registered. UUID: 93cb51ea-2419-4f6e-837e-217ee964e628 Settings file: 'C:\ProgramData\BOINC\slots\2\boinc_a42bf106eafc20d9\boinc_a42bf106eafc20d9.vbox' 2021-06-17 12:43:27 (9688): Command: VBoxManage -q modifyvm "boinc_a42bf106eafc20d9" --description "08371021_49_2" Exit Code: 0 Output: 2021-06-17 12:43:27 (9688): Command: VBoxManage -q modifyvm "boinc_a42bf106eafc20d9" --memory 3072 Exit Code: 0 Output: 2021-06-17 12:43:27 (9688): Command: VBoxManage -q modifyvm "boinc_a42bf106eafc20d9" --cpus 1 Exit Code: 0 Output: 2021-06-17 12:43:27 (9688): Command: VBoxManage -q modifyvm "boinc_a42bf106eafc20d9" --acpi on --ioapic on Exit Code: 0 Output: 2021-06-17 12:43:28 (9688): Command: VBoxManage -q modifyvm "boinc_a42bf106eafc20d9" --boot1 disk --boot2 dvd --boot3 none --boot4 none Exit Code: 0 Output: 2021-06-17 12:43:28 (9688): Command: VBoxManage -q modifyvm "boinc_a42bf106eafc20d9" --nic1 nat --natdnsproxy1 on --cableconnected1 off Exit Code: 0 Output: 2021-06-17 12:43:28 (9688): Command: VBoxManage -q modifyvm "boinc_a42bf106eafc20d9" --cableconnected1 on Exit Code: 0 Output: 2021-06-17 12:43:28 (9688): Command: VBoxManage -q modifyvm "boinc_a42bf106eafc20d9" --usb off Exit Code: 0 Output: 2021-06-17 12:43:29 (9688): Command: VBoxManage -q modifyvm "boinc_a42bf106eafc20d9" --uart1 off --uart2 off Exit Code: 0 Output: 2021-06-17 12:43:29 (9688): Command: VBoxManage -q modifyvm "boinc_a42bf106eafc20d9" --lpt1 off --lpt2 off Exit Code: 0 Output: 2021-06-17 12:43:29 (9688): Command: VBoxManage -q modifyvm "boinc_a42bf106eafc20d9" --audio none Exit Code: 0 Output: 2021-06-17 12:43:30 (9688): Command: VBoxManage -q modifyvm "boinc_a42bf106eafc20d9" --clipboard disabled Exit Code: 0 Output: 2021-06-17 12:43:30 (9688): Command: VBoxManage -q modifyvm "boinc_a42bf106eafc20d9" --draganddrop disabled Exit Code: 0 Output: 2021-06-17 12:43:30 (9688): Command: VBoxManage -q storagectl "boinc_a42bf106eafc20d9" --name "Hard Disk Controller" --add "sata" --controller "IntelAHCI" --hostiocache off --portcount 3 Exit Code: 0 Output: 2021-06-17 12:43:30 (9688): Command: VBoxManage -q storageattach "boinc_a42bf106eafc20d9" --storagectl "Hard Disk Controller" --port 0 --device 0 --type dvddrive --medium "C:\ProgramData\BOINC\slots\2/vm_isocontext.iso" Exit Code: 0 Output: 2021-06-17 12:43:31 (9688): Command: VBoxManage -q storageattach "boinc_a42bf106eafc20d9" --storagectl "Hard Disk Controller" --port 2 --device 0 --type dvddrive --medium "C:\Program Files\Oracle\VirtualBox/VBoxGuestAdditions.iso" Exit Code: 0 Output: 2021-06-17 12:43:31 (9688): Command: VBoxManage -q bandwidthctl "boinc_a42bf106eafc20d9" add "boinc_a42bf106eafc20d9_net" --type network --limit 1024G Exit Code: 0 Output: 2021-06-17 12:43:31 (9688): Command: VBoxManage -q sharedfolder add "boinc_a42bf106eafc20d9" --name "shared" --hostpath "C:\ProgramData\BOINC\slots\2/shared" Exit Code: 0 Output: 2021-06-17 12:43:35 (9688): Command: VBoxManage -q startvm "boinc_a42bf106eafc20d9" --type headless Exit Code: 0 Output: Waiting for VM "boinc_a42bf106eafc20d9" to power on... VM "boinc_a42bf106eafc20d9" has been successfully started. 2021-06-17 12:43:36 (9688): Command: VBoxManage -q controlvm "boinc_a42bf106eafc20d9" cpuexecutioncap 100 Exit Code: 0 Output: 2021-06-17 14:56:40 (9688): Command: VBoxManage -q controlvm "boinc_a42bf106eafc20d9" poweroff Exit Code: 0 Output: 0%...10%...20%...30%...40%...50%...60%...70%...80%...90%...100% 2021-06-17 14:56:40 (9688): Command: VBoxManage -q snapshot "boinc_a42bf106eafc20d9" list Exit Code: -108 Output: This machine does not have any snapshots 2021-06-17 14:56:40 (9688): Command: VBoxManage -q bandwidthctl "boinc_a42bf106eafc20d9" remove "boinc_a42bf106eafc20d9_net" Exit Code: 0 Output: 2021-06-17 14:56:40 (9688): Command: VBoxManage -q unregistervm "boinc_a42bf106eafc20d9" --delete Exit Code: 0 Output: 0%...10%...20%...30%...40%...50%...60%...70%...80%...90%...100% 2021-06-17 14:56:40 (9688): Command: VBoxManage -q closemedium dvd "C:\ProgramData\BOINC\slots\2/vm_isocontext.iso" --delete Exit Code: 0 Output: 0%...10%...20%...30%...40%...50%...60%...70%...80%...90%...100% 14:56:51 (9688): called boinc_finish(194) </stderr_txt> ]]>
©2024 COPYRIGHT 2017-2018 NCN