Name Theory_2773-3006993-389_1
Workunit 229886518
Created 22 Jan 2025, 3:19:00 UTC
Sent 22 Jan 2025, 8:52:44 UTC
Report deadline 2 Feb 2025, 8:52:44 UTC
Received 22 Jan 2025, 9:49:24 UTC
Server state Over
Outcome Computation error
Client state Compute error
Exit status -2147467259 (0x80004005) Unknown error code
Computer ID 10856573
Run time 26 sec
CPU time
Validate state Invalid
Credit 0.00
Device peak FLOPS 4.46 GFLOPS
Application version Theory Simulation v300.60 (vbox64_theory)
windows_x86_64
Peak working set size 10.75 MB
Peak swap size 5.26 MB
Peak disk usage 1.01 MB

Stderr output

<core_client_version>8.0.2</core_client_version>
<![CDATA[
<message>
Unspecified error
 (0x80004005) - exit code 2147500037 (0x80004005)</message>
<stderr_txt>
2025-01-22 00:52:50 (51164): vboxwrapper version 26208
2025-01-22 00:52:50 (51164): BOINC client version: 8.0.2
2025-01-22 00:52:50 (51164): Detected: VirtualBox VboxManage Interface (Version: 7.0.6)
2025-01-22 00:52:51 (51164): Detected: Heartbeat check (file: 'heartbeat' every 1200.000000 seconds)
2025-01-22 00:52:51 (51164): Successfully copied 'init_data.xml' to the shared directory.
2025-01-22 00:52:51 (51164): Successfully copied 'input' to the shared directory.
2025-01-22 00:52:51 (51164): Create VM. (boinc_8bae533360b64665, slot#2)
2025-01-22 00:52:51 (51164): Setting Memory Size for VM. (630MB)
2025-01-22 00:52:52 (51164): Setting CPU Count for VM. (1)
2025-01-22 00:52:52 (51164): Setting Chipset Options for VM.
2025-01-22 00:52:52 (51164): Setting Graphics Controller Options for VM.
2025-01-22 00:52:52 (51164): Setting Boot Options for VM.
2025-01-22 00:52:53 (51164): Setting Network Configuration for NAT.
2025-01-22 00:52:53 (51164): Enabling VM Network Access.
2025-01-22 00:52:53 (51164): Disabling USB Support for VM.
2025-01-22 00:52:54 (51164): Disabling COM Port Support for VM.
2025-01-22 00:52:54 (51164): Disabling LPT Port Support for VM.
2025-01-22 00:52:54 (51164): Disabling Audio Support for VM.
2025-01-22 00:52:54 (51164): Disabling Clipboard Support for VM.
2025-01-22 00:52:55 (51164): Disabling Drag and Drop Support for VM.
2025-01-22 00:52:55 (51164): Adding storage controller(s) to VM.
2025-01-22 00:52:55 (51164): Adding virtual disk drive to VM. (Theory_2025_01_16_prod.vdi)
2025-01-22 00:52:56 (51164): Adding VirtualBox Guest Additions to VM.
2025-01-22 00:52:56 (51164): Adding network bandwidth throttle group to VM. (Defaulting to 1024GB)
2025-01-22 00:52:56 (51164): forwarding host port 57006 to guest port 80
2025-01-22 00:52:56 (51164): Enabling remote desktop for VM.
2025-01-22 00:52:57 (51164): Required extension pack not installed, remote desktop not enabled.
2025-01-22 00:52:57 (51164): Enabling shared directory for VM.
2025-01-22 00:52:57 (51164): Starting VM using VBoxManage interface. (boinc_8bae533360b64665, slot#2)
2025-01-22 00:53:03 (51164): Error in start VM for VM: -2147467259
Command:
VBoxManage -q startvm "boinc_8bae533360b64665" --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_8bae533360b64665" to power on...

2025-01-22 00:53:03 (51164): VM failed to start.
2025-01-22 00:53:03 (51164): Could not start 
2025-01-22 00:53:03 (51164): ERROR: VM failed to start
2025-01-22 00:53:03 (51164): Powering off VM.
2025-01-22 00:53:03 (51164): Deregistering VM. (boinc_8bae533360b64665, slot#2)
2025-01-22 00:53:04 (51164): Removing network bandwidth throttle group from VM.
2025-01-22 00:53:04 (51164): Removing VM from VirtualBox.

    Hypervisor System Log:

07:22:29.185010          Launched VM: 824678208 pid: 48592 (0xbdd0) frontend: headless name: boinc_b22e188654330154
07:22:29.353177          Saving settings file "C:\ProgramData\BOINC\slots\5\boinc_56e2255099bde750\boinc_56e2255099bde750.vbox" with version "1.19-windows"
07:22:29.356711          Finished saving settings file "C:\ProgramData\BOINC\slots\5\boinc_56e2255099bde750\boinc_56e2255099bde750.vbox"
07:22:29.870944          Saving settings file "C:\ProgramData\BOINC\slots\5\boinc_56e2255099bde750\boinc_56e2255099bde750.vbox" with version "1.19-windows"
07:22:29.873970          Finished saving settings file "C:\ProgramData\BOINC\slots\5\boinc_56e2255099bde750\boinc_56e2255099bde750.vbox"
07:22:30.135778          ERROR [COM]: aRC=VBOX_E_OBJECT_NOT_FOUND (0x80bb0001) aIID={7682d5eb-f00e-44f1-8ca2-99d08b1cd607} aComponent={VirtualBoxWrap} aText={&#197;&#131;o extension pack providing a cryptographic support module could be found}, preserve=false aResultDetail=0
07:22:30.141510          ERROR [COM]: aRC=VBOX_E_OBJECT_NOT_FOUND (0x80bb0001) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={SessionMachine} aText={No storage device attached to device slot 0 on port 2 of controller 'Hard Disk Controller'}, preserve=false aResultDetail=0
07:22:30.141602          ERROR [COM]: aRC=VBOX_E_OBJECT_NOT_FOUND (0x80bb0001) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={SessionMachine} aText={No storage device attached to device slot 0 on port 2 of controller 'Hard Disk Controller'}, preserve=false aResultDetail=0
07:22:30.152770          ERROR [COM]: aRC=E_FAIL (0x80004005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={SessionMachine} aText={This machine does not have any snapshots}, preserve=false aResultDetail=0
07:22:30.399977          Launched VM: 829994208 pid: 49108 (0xbfd4) frontend: headless name: boinc_56e2255099bde750
07:22:31.472880          Saving settings file "C:\ProgramData\BOINC\slots\2\boinc_8bae533360b64665\boinc_8bae533360b64665.vbox" with version "1.19-windows"
07:22:31.483865          Finished saving settings file "C:\ProgramData\BOINC\slots\2\boinc_8bae533360b64665\boinc_8bae533360b64665.vbox"
07:22:31.569823          ERROR [COM]: aRC=E_FAIL (0x80004005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={SessionMachine} aText={This machine does not have any snapshots}, preserve=false aResultDetail=0
07:22:31.974619          Saving settings file "C:\Users\docto\.VirtualBox\VirtualBox.xml" with version "1.12-windows"
07:22:31.983050          Finished saving settings file "C:\Users\docto\.VirtualBox\VirtualBox.xml"
07:22:31.986152 DeleteVM Saving settings file "C:\ProgramData\BOINC\slots\1\boinc_7ea7e8f73a8a9697\boinc_7ea7e8f73a8a9697.vbox" with version "1.19-windows"
07:22:32.091193 DeleteVM Finished saving settings file "C:\ProgramData\BOINC\slots\1\boinc_7ea7e8f73a8a9697\boinc_7ea7e8f73a8a9697.vbox"
07:22:32.308884          Saving settings file "C:\ProgramData\BOINC\slots\0\boinc_05e947695365c756\boinc_05e947695365c756.vbox" with version "1.19-windows"
07:22:32.383483          Finished saving settings file "C:\ProgramData\BOINC\slots\0\boinc_05e947695365c756\boinc_05e947695365c756.vbox"
07:22:32.470964          ERROR [COM]: aRC=E_FAIL (0x80004005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={SessionMachine} aText={This machine does not have any snapshots}, preserve=false aResultDetail=0
07:22:32.797890          ERROR [COM]: aRC=VBOX_E_INVALID_OBJECT_STATE (0x80bb0007) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={Cannot unregister the machine 'boinc_05e947695365c756' while it is locked}, preserve=false aResultDetail=0
07:22:33.220116          Saving settings file "C:\ProgramData\BOINC\slots\4\boinc_b5e6760688530437\boinc_b5e6760688530437.vbox" with version "1.19-windows"
07:22:33.266863          Finished saving settings file "C:\ProgramData\BOINC\slots\4\boinc_b5e6760688530437\boinc_b5e6760688530437.vbox"
07:22:33.354583          ERROR [COM]: aRC=E_FAIL (0x80004005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={SessionMachine} aText={This machine does not have any snapshots}, preserve=false aResultDetail=0
07:22:33.448859          Saving settings file "C:\ProgramData\BOINC\slots\4\boinc_b5e6760688530437\boinc_b5e6760688530437.vbox" with version "1.19-windows"
07:22:33.452043          Finished saving settings file "C:\ProgramData\BOINC\slots\4\boinc_b5e6760688530437\boinc_b5e6760688530437.vbox"
07:22:34.057799          Saving settings file "C:\Users\docto\.VirtualBox\VirtualBox.xml" with version "1.12-windows"
07:22:34.134467          Finished saving settings file "C:\Users\docto\.VirtualBox\VirtualBox.xml"
07:22:34.135687 DeleteVM Saving settings file "C:\ProgramData\BOINC\slots\1\boinc_7ea7e8f73a8a9697\boinc_7ea7e8f73a8a9697.vbox" with version "1.19-windows"
07:22:34.138984 DeleteVM Finished saving settings file "C:\ProgramData\BOINC\slots\1\boinc_7ea7e8f73a8a9697\boinc_7ea7e8f73a8a9697.vbox"
07:22:34.471349          Saving settings file "C:\Users\docto\.VirtualBox\VirtualBox.xml" with version "1.12-windows"
07:22:34.474577          Finished saving settings file "C:\Users\docto\.VirtualBox\VirtualBox.xml"
07:22:34.475481 DeleteVM Saving settings file "C:\ProgramData\BOINC\slots\1\boinc_7ea7e8f73a8a9697\boinc_7ea7e8f73a8a9697.vbox" with version "1.19-windows"
07:22:34.489478 DeleteVM Finished saving settings file "C:\ProgramData\BOINC\slots\1\boinc_7ea7e8f73a8a9697\boinc_7ea7e8f73a8a9697.vbox"
07:22:34.989685          Saving settings file "C:\ProgramData\BOINC\slots\3\boinc_b22e188654330154\boinc_b22e188654330154.vbox" with version "1.19-windows"
07:22:34.999405          Finished saving settings file "C:\ProgramData\BOINC\slots\3\boinc_b22e188654330154\boinc_b22e188654330154.vbox"
07:22:35.087988          ERROR [COM]: aRC=E_FAIL (0x80004005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={SessionMachine} aText={This machine does not have any snapshots}, preserve=false aResultDetail=0
07:22:35.169877          Saving settings file "C:\ProgramData\BOINC\slots\3\boinc_b22e188654330154\boinc_b22e188654330154.vbox" with version "1.19-windows"
07:22:35.216182          Finished saving settings file "C:\ProgramData\BOINC\slots\3\boinc_b22e188654330154\boinc_b22e188654330154.vbox"
07:22:35.422828          Saving settings file "C:\Users\docto\.VirtualBox\VirtualBox.xml" with version "1.12-windows"
07:22:35.425850          Finished saving settings file "C:\Users\docto\.VirtualBox\VirtualBox.xml"
07:22:35.429182 DeleteVM Saving settings file "C:\ProgramData\BOINC\slots\1\boinc_7ea7e8f73a8a9697\boinc_7ea7e8f73a8a9697.vbox" with version "1.19-windows"
07:22:35.435703 DeleteVM Finished saving settings file "C:\ProgramData\BOINC\slots\1\boinc_7ea7e8f73a8a9697\boinc_7ea7e8f73a8a9697.vbox"
07:22:36.064958          Saving settings file "C:\ProgramData\BOINC\slots\5\boinc_56e2255099bde750\boinc_56e2255099bde750.vbox" with version "1.19-windows"
07:22:36.071828          Finished saving settings file "C:\ProgramData\BOINC\slots\5\boinc_56e2255099bde750\boinc_56e2255099bde750.vbox"
07:22:36.156088          ERROR [COM]: aRC=E_FAIL (0x80004005) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={SessionMachine} aText={This machine does not have any snapshots}, preserve=false aResultDetail=0
07:22:36.220822          Saving settings file "C:\ProgramData\BOINC\slots\5\boinc_56e2255099bde750\boinc_56e2255099bde750.vbox" with version "1.19-windows"
07:22:36.232412          Finished saving settings file "C:\ProgramData\BOINC\slots\5\boinc_56e2255099bde750\boinc_56e2255099bde750.vbox"
07:22:36.485577          Saving settings file "C:\Users\docto\.VirtualBox\VirtualBox.xml" with version "1.12-windows"
07:22:36.493075          Finished saving settings file "C:\Users\docto\.VirtualBox\VirtualBox.xml"
07:22:36.496981 DeleteVM Saving settings file "C:\ProgramData\BOINC\slots\1\boinc_7ea7e8f73a8a9697\boinc_7ea7e8f73a8a9697.vbox" with version "1.19-windows"
07:22:36.502320 DeleteVM Finished saving settings file "C:\ProgramData\BOINC\slots\1\boinc_7ea7e8f73a8a9697\boinc_7ea7e8f73a8a9697.vbox"

    VM Execution Log:


    VM Startup Log:


    VM Trace Log:

Users\docto\VirtualBox VMs
Raw-mode Supported:              no
Exclusive HW virtualization use: off
Default hard disk format:        VDI
VRDE auth library:               VBoxAuth
Webservice auth. library:        VBoxAuth
Remote desktop ExtPack:          
VM encryption ExtPack:           
Log history count:               3
Default frontend:                
Default audio driver:            Windows Audio Session
Autostart database path:         
Default Guest Additions ISO:     C:\Program Files\Oracle\VirtualBox/VBoxGuestAdditions.iso
Logging Level:                   all
Proxy Mode:                      System
Proxy URL:                       
User language:                   C

2025-01-22 00:52:51 (51164): 
Command: VBoxManage -q list hostinfo 
Exit Code: 0
Output:
Host Information:

Host time: 2025-01-22T08:52:50.954000000Z
Processor online count: 8
Processor count: 8
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 supports virt. vmsave/vmload: no
Processor#0 speed: unknown
Processor#0 description: Intel(R) Core(TM) i5-8300H CPU @ 2.30GHz
Processor#1 speed: unknown
Processor#1 description: Intel(R) Core(TM) i5-8300H CPU @ 2.30GHz
Processor#2 speed: unknown
Processor#2 description: Intel(R) Core(TM) i5-8300H CPU @ 2.30GHz
Processor#3 speed: unknown
Processor#3 description: Intel(R) Core(TM) i5-8300H CPU @ 2.30GHz
Processor#4 speed: unknown
Processor#4 description: Intel(R) Core(TM) i5-8300H CPU @ 2.30GHz
Processor#5 speed: unknown
Processor#5 description: Intel(R) Core(TM) i5-8300H CPU @ 2.30GHz
Processor#6 speed: unknown
Processor#6 description: Intel(R) Core(TM) i5-8300H CPU @ 2.30GHz
Processor#7 speed: unknown
Processor#7 description: Intel(R) Core(TM) i5-8300H CPU @ 2.30GHz
Memory size: 8081 MByte
Memory available: 2409 MByte
Operating system: Windows 11
Operating system version: 10.0.22631

2025-01-22 00:52:51 (51164): 
Command: VBoxManage -q showvminfo "boinc_8bae533360b64665" --machinereadable 
Exit Code: -2135228415
Output:
VBoxManage.exe: error: Could not find a registered machine named 'boinc_8bae533360b64665'
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 3139 of file VBoxManageInfo.cpp

2025-01-22 00:52:51 (51164): 
Command: VBoxManage -q createvm --name "boinc_8bae533360b64665" --basefolder "C:\ProgramData\BOINC\slots\2" --ostype "Linux26_64" --register
Exit Code: 0
Output:
Virtual machine 'boinc_8bae533360b64665' is created and registered.
UUID: d5d400e9-d40d-4da1-8284-818b84c52b43
Settings file: 'C:\ProgramData\BOINC\slots\2\boinc_8bae533360b64665\boinc_8bae533360b64665.vbox'

2025-01-22 00:52:51 (51164): 
Command: VBoxManage -q modifyvm "boinc_8bae533360b64665" --description "Theory_2773-3006993-389_1" 
Exit Code: 0
Output:

2025-01-22 00:52:52 (51164): 
Command: VBoxManage -q modifyvm "boinc_8bae533360b64665" --memory 630 
Exit Code: 0
Output:

2025-01-22 00:52:52 (51164): 
Command: VBoxManage -q modifyvm "boinc_8bae533360b64665" --cpus 1 
Exit Code: 0
Output:

2025-01-22 00:52:52 (51164): 
Command: VBoxManage -q modifyvm "boinc_8bae533360b64665" --acpi on --ioapic on --rtcuseutc off 
Exit Code: 0
Output:

2025-01-22 00:52:52 (51164): 
Command: VBoxManage -q modifyvm "boinc_8bae533360b64665" --vram 16 --graphicscontroller VBoxVGA 
Exit Code: 0
Output:

2025-01-22 00:52:53 (51164): 
Command: VBoxManage -q modifyvm "boinc_8bae533360b64665" --boot1 disk --boot2 dvd --boot3 none --boot4 none 
Exit Code: 0
Output:

2025-01-22 00:52:53 (51164): 
Command: VBoxManage -q modifyvm "boinc_8bae533360b64665" --nic1 nat --natdnsproxy1 on --cableconnected1 off 
Exit Code: 0
Output:

2025-01-22 00:52:53 (51164): 
Command: VBoxManage -q modifyvm "boinc_8bae533360b64665" --cableconnected1 on 
Exit Code: 0
Output:

2025-01-22 00:52:54 (51164): 
Command: VBoxManage -q modifyvm "boinc_8bae533360b64665" --usb off 
Exit Code: 0
Output:

2025-01-22 00:52:54 (51164): 
Command: VBoxManage -q modifyvm "boinc_8bae533360b64665" --uart1 off --uart2 off 
Exit Code: 0
Output:

2025-01-22 00:52:54 (51164): 
Command: VBoxManage -q modifyvm "boinc_8bae533360b64665" --lpt1 off --lpt2 off 
Exit Code: 0
Output:

2025-01-22 00:52:54 (51164): 
Command: VBoxManage -q modifyvm "boinc_8bae533360b64665" --audio-enabled off 
Exit Code: 0
Output:

2025-01-22 00:52:55 (51164): 
Command: VBoxManage -q modifyvm "boinc_8bae533360b64665" --clipboard disabled 
Exit Code: 0
Output:

2025-01-22 00:52:55 (51164): 
Command: VBoxManage -q modifyvm "boinc_8bae533360b64665" --draganddrop disabled 
Exit Code: 0
Output:

2025-01-22 00:52:55 (51164): 
Command: VBoxManage -q storagectl "boinc_8bae533360b64665" --name "Hard Disk Controller" --add "sata" --controller "IntelAHCI" --hostiocache off --portcount 3
Exit Code: 0
Output:

2025-01-22 00:52:55 (51164): 
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:          locked read
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:    2408986a-5662-4b77-aa5f-77c6b7a9b21d

2025-01-22 00:52:56 (51164): 
Command: VBoxManage -q storageattach "boinc_8bae533360b64665" --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:

2025-01-22 00:52:56 (51164): 
Command: VBoxManage -q storageattach "boinc_8bae533360b64665" --storagectl "Hard Disk Controller" --port 1 --device 0 --type dvddrive --medium "C:\Program Files\Oracle\VirtualBox/VBoxGuestAdditions.iso" 
Exit Code: 0
Output:

2025-01-22 00:52:56 (51164): 
Command: VBoxManage -q bandwidthctl "boinc_8bae533360b64665" add "boinc_8bae533360b64665_net" --type network --limit 1024G 
Exit Code: 0
Output:

2025-01-22 00:52:56 (51164): 
Command: VBoxManage -q modifyvm "boinc_8bae533360b64665" --natpf1 ",tcp,127.0.0.1,57006,,80" 
Exit Code: 0
Output:

2025-01-22 00:52:57 (51164): 
Command: VBoxManage -q list extpacks
Exit Code: 0
Output:
Extension Packs: 0

2025-01-22 00:52:57 (51164): 
Command: VBoxManage -q sharedfolder add "boinc_8bae533360b64665" --name "shared" --hostpath "C:\ProgramData\BOINC\slots\2/shared"
Exit Code: 0
Output:

2025-01-22 00:53:03 (51164): 
Command: VBoxManage -q startvm "boinc_8bae533360b64665" --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_8bae533360b64665" to power on...

2025-01-22 00:53:04 (51164): 
Command: VBoxManage -q snapshot "boinc_8bae533360b64665" list 
Exit Code: -108
Output:
This machine does not have any snapshots

2025-01-22 00:53:04 (51164): 
Command: VBoxManage -q bandwidthctl "boinc_8bae533360b64665" remove "boinc_8bae533360b64665_net" 
Exit Code: 0
Output:
VBoxManage.exe: error: Bandwidth groups cannot be deleted while the VM is running

2025-01-22 00:53:04 (51164): 
Command: VBoxManage -q unregistervm "boinc_8bae533360b64665" --delete 
Exit Code: 0
Output:
0%...10%...20%...30%...40%...50%...60%...70%...80%...90%...100%

2025-01-22 00:53:14 (51164): called boinc_finish(-2147467259)

</stderr_txt>
]]>


©2025 CERN