Name kCRKDmdy736nsSi4ap6QjLDmwznN0nGgGQJmkKkKDmO9iKDm0Hppbn_0
Workunit 230410210
Created 17 Feb 2025, 4:32:07 UTC
Sent 17 Feb 2025, 7:53:34 UTC
Report deadline 25 Feb 2025, 7:53:34 UTC
Received 17 Feb 2025, 8:54:49 UTC
Server state Over
Outcome Computation error
Client state Compute error
Exit status -2147467259 (0x80004005) Unknown error code
Computer ID 10695367
Run time 30 sec
CPU time
Validate state Invalid
Credit 0.00
Device peak FLOPS 31.06 GFLOPS
Application version ATLAS Simulation v3.01 (vbox64_mt_mcore_atlas)
windows_x86_64
Peak working set size 11.25 MB
Peak swap size 6.25 MB
Peak disk usage 328.59 MB

Stderr output

<core_client_version>8.0.2</core_client_version>
<![CDATA[
<message>
Error no especificado
 (0x80004005) - exit code 2147500037 (0x80004005)</message>
<stderr_txt>
2025-02-17 08:53:53 (34276): Detected: vboxwrapper 26206
2025-02-17 08:53:53 (34276): Detected: BOINC client v8.0.2
2025-02-17 08:53:55 (34276): Detected: VirtualBox VboxManage Interface (Version: 7.0.6)
2025-02-17 08:53:55 (34276): Successfully copied 'init_data.xml' to the shared directory.
2025-02-17 08:53:56 (34276): Create VM. (boinc_dd914e0708f92935, slot#5)
2025-02-17 08:53:56 (34276): Setting Memory Size for VM. (4800MB)
2025-02-17 08:53:57 (34276): Setting CPU Count for VM. (8)
2025-02-17 08:53:57 (34276): Setting Chipset Options for VM.
2025-02-17 08:53:57 (34276): Setting Graphics Controller Options for VM.
2025-02-17 08:53:58 (34276): Setting Boot Options for VM.
2025-02-17 08:53:58 (34276): Setting Network Configuration for NAT.
2025-02-17 08:53:58 (34276): Enabling VM Network Access.
2025-02-17 08:53:58 (34276): Disabling USB Support for VM.
2025-02-17 08:53:59 (34276): Disabling COM Port Support for VM.
2025-02-17 08:53:59 (34276): Disabling LPT Port Support for VM.
2025-02-17 08:53:59 (34276): Disabling Audio Support for VM.
2025-02-17 08:53:59 (34276): Disabling Clipboard Support for VM.
2025-02-17 08:54:00 (34276): Disabling Drag and Drop Support for VM.
2025-02-17 08:54:00 (34276): Adding storage controller(s) to VM.
2025-02-17 08:54:00 (34276): Adding virtual disk drive to VM. (ATLAS_vbox_3.01_image.vdi)
2025-02-17 08:54:03 (34276): Adding VirtualBox Guest Additions to VM.
2025-02-17 08:54:03 (34276): Adding network bandwidth throttle group to VM. (Defaulting to 1024GB)
2025-02-17 08:54:04 (34276): forwarding host port 59032 to guest port 80
2025-02-17 08:54:04 (34276): Enabling remote desktop for VM.
2025-02-17 08:54:05 (34276): Enabling shared directory for VM.
2025-02-17 08:54:05 (34276): Starting VM using VBoxManage interface. (boinc_dd914e0708f92935, slot#5)
2025-02-17 08:54:12 (34276): Error in start VM for VM: -2147467259
Command:
VBoxManage -q startvm "boinc_dd914e0708f92935" --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_dd914e0708f92935" to power on...

2025-02-17 08:54:12 (34276): VM failed to start.
2025-02-17 08:54:12 (34276): Could not start 
2025-02-17 08:54:12 (34276): ERROR: VM failed to start
2025-02-17 08:54:12 (34276): Powering off VM.
2025-02-17 08:54:12 (34276): Deregistering VM. (boinc_dd914e0708f92935, slot#5)
2025-02-17 08:54:12 (34276): Removing network bandwidth throttle group from VM.
2025-02-17 08:54:12 (34276): Removing VM from VirtualBox.

    Hypervisor System Log:

00:00:08.915360          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 0 of controller 'Hard Disk Controller'}, preserve=false aResultDetail=0
00:00:08.916131          Saving settings file "C:\Users\jorge\.VirtualBox\VirtualBox.xml" with version "1.12-windows"
00:00:08.920952          Finished saving settings file "C:\Users\jorge\.VirtualBox\VirtualBox.xml"
00:00:08.921602          Saving settings file "C:\ProgramData\BOINC\slots\5\boinc_dd914e0708f92935\boinc_dd914e0708f92935.vbox" with version "1.19-windows"
00:00:08.926400          Finished saving settings file "C:\ProgramData\BOINC\slots\5\boinc_dd914e0708f92935\boinc_dd914e0708f92935.vbox"
00:00:09.178130          Saving settings file "C:\ProgramData\BOINC\slots\5\boinc_dd914e0708f92935\boinc_dd914e0708f92935.vbox" with version "1.19-windows"
00:00:09.184420          Finished saving settings file "C:\ProgramData\BOINC\slots\5\boinc_dd914e0708f92935\boinc_dd914e0708f92935.vbox"
00:00:09.430333          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 0 of controller 'Hard Disk Controller'}, preserve=false aResultDetail=0
00:00:09.431187          Saving settings file "C:\ProgramData\BOINC\slots\5\boinc_dd914e0708f92935\boinc_dd914e0708f92935.vbox" with version "1.19-windows"
00:00:09.436104          Finished saving settings file "C:\ProgramData\BOINC\slots\5\boinc_dd914e0708f92935\boinc_dd914e0708f92935.vbox"
00:00:09.436396          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 0 of controller 'Hard Disk Controller'}, preserve=false aResultDetail=0
00:00:09.456073          Saving settings file "C:\ProgramData\BOINC\slots\5\boinc_dd914e0708f92935\boinc_dd914e0708f92935.vbox" with version "1.19-windows"
00:00:09.461243          Finished saving settings file "C:\ProgramData\BOINC\slots\5\boinc_dd914e0708f92935\boinc_dd914e0708f92935.vbox"
00:00:09.462431          Saving settings file "C:\ProgramData\BOINC\slots\5\boinc_dd914e0708f92935\boinc_dd914e0708f92935.vbox" with version "1.19-windows"
00:00:09.467736          Finished saving settings file "C:\ProgramData\BOINC\slots\5\boinc_dd914e0708f92935\boinc_dd914e0708f92935.vbox"
00:00:09.702209          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 1 of controller 'Hard Disk Controller'}, preserve=false aResultDetail=0
00:00:09.724909          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 1 of controller 'Hard Disk Controller'}, preserve=false aResultDetail=0
00:00:09.725164          Saving settings file "C:\Users\jorge\.VirtualBox\VirtualBox.xml" with version "1.12-windows"
00:00:09.730098          Finished saving settings file "C:\Users\jorge\.VirtualBox\VirtualBox.xml"
00:00:09.730500          Saving settings file "C:\Users\jorge\.VirtualBox\VirtualBox.xml" with version "1.12-windows"
00:00:09.734782          Finished saving settings file "C:\Users\jorge\.VirtualBox\VirtualBox.xml"
00:00:09.735340          Saving settings file "C:\ProgramData\BOINC\slots\5\boinc_dd914e0708f92935\boinc_dd914e0708f92935.vbox" with version "1.19-windows"
00:00:09.739408          Finished saving settings file "C:\ProgramData\BOINC\slots\5\boinc_dd914e0708f92935\boinc_dd914e0708f92935.vbox"
00:00:09.990681          Saving settings file "C:\ProgramData\BOINC\slots\5\boinc_dd914e0708f92935\boinc_dd914e0708f92935.vbox" with version "1.19-windows"
00:00:09.996212          Finished saving settings file "C:\ProgramData\BOINC\slots\5\boinc_dd914e0708f92935\boinc_dd914e0708f92935.vbox"
00:00:10.250501          Saving settings file "C:\ProgramData\BOINC\slots\5\boinc_dd914e0708f92935\boinc_dd914e0708f92935.vbox" with version "1.19-windows"
00:00:10.255549          Finished saving settings file "C:\ProgramData\BOINC\slots\5\boinc_dd914e0708f92935\boinc_dd914e0708f92935.vbox"
00:00:10.852669          Saving settings file "C:\ProgramData\BOINC\slots\5\boinc_dd914e0708f92935\boinc_dd914e0708f92935.vbox" with version "1.19-windows"
00:00:10.858868          Finished saving settings file "C:\ProgramData\BOINC\slots\5\boinc_dd914e0708f92935\boinc_dd914e0708f92935.vbox"
00:00:11.243716          Saving settings file "C:\ProgramData\BOINC\slots\5\boinc_dd914e0708f92935\boinc_dd914e0708f92935.vbox" with version "1.19-windows"
00:00:11.250014          Finished saving settings file "C:\ProgramData\BOINC\slots\5\boinc_dd914e0708f92935\boinc_dd914e0708f92935.vbox"
00:00:11.495637          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
00:00:11.513790          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
00:00:11.513934          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
00:00:11.531854          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
00:00:11.814650          Launched VM: 1830748272 pid: 33520 (0x82f0) frontend: headless name: boinc_dd914e0708f92935
00:00:18.230326          Saving settings file "C:\ProgramData\BOINC\slots\5\boinc_dd914e0708f92935\boinc_dd914e0708f92935.vbox" with version "1.19-windows"
00:00:18.236388          Finished saving settings file "C:\ProgramData\BOINC\slots\5\boinc_dd914e0708f92935\boinc_dd914e0708f92935.vbox"
00:00:18.340916          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
00:00:18.676580          ERROR [COM]: aRC=VBOX_E_INVALID_OBJECT_STATE (0x80bb0007) aIID={300763af-5d6b-46e6-aa96-273eac15538a} aComponent={MachineWrap} aText={Cannot unregister the machine 'boinc_dd914e0708f92935' while it is locked}, preserve=false aResultDetail=0
00:00:19.936079          Saving settings file "C:\Users\jorge\.VirtualBox\VirtualBox.xml" with version "1.12-windows"
00:00:19.941131          Finished saving settings file "C:\Users\jorge\.VirtualBox\VirtualBox.xml"
00:00:19.941266          Saving settings file "C:\Users\jorge\.VirtualBox\VirtualBox.xml" with version "1.12-windows"
00:00:19.946105          Finished saving settings file "C:\Users\jorge\.VirtualBox\VirtualBox.xml"
00:00:19.947416 DeleteVM Saving settings file "C:\Users\jorge\.VirtualBox\VirtualBox.xml" with version "1.12-windows"
00:00:19.952723 DeleteVM Finished saving settings file "C:\Users\jorge\.VirtualBox\VirtualBox.xml"
00:00:24.962121 main     VirtualBox: object deletion starts
00:00:24.963185 main     HostDnsMonitor: shutting down ...
00:00:24.963227 main     HostDnsMonitor: shut down
00:00:24.966306 Watcher  ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={7682d5eb-f00e-44f1-8ca2-99d08b1cd607} aComponent={VirtualBoxWrap} aText={The object is not ready}, preserve=false aResultDetail=0
00:00:24.967141 main     VirtualBox: object deleted

    VM Execution Log:


    VM Startup Log:


    VM Trace Log:

e: 0
Output:

2025-02-17 08:53:57 (34276): 
Command: VBoxManage -q modifyvm "boinc_dd914e0708f92935" --acpi on --ioapic on --rtcuseutc off 
Exit Code: 0
Output:

2025-02-17 08:53:58 (34276): 
Command: VBoxManage -q modifyvm "boinc_dd914e0708f92935" --vram 16 --graphicscontroller VBoxVGA 
Exit Code: 0
Output:

2025-02-17 08:53:58 (34276): 
Command: VBoxManage -q modifyvm "boinc_dd914e0708f92935" --boot1 disk --boot2 dvd --boot3 none --boot4 none 
Exit Code: 0
Output:

2025-02-17 08:53:58 (34276): 
Command: VBoxManage -q modifyvm "boinc_dd914e0708f92935" --nic1 nat --natdnsproxy1 on --cableconnected1 off 
Exit Code: 0
Output:

2025-02-17 08:53:58 (34276): 
Command: VBoxManage -q modifyvm "boinc_dd914e0708f92935" --cableconnected1 on 
Exit Code: 0
Output:

2025-02-17 08:53:59 (34276): 
Command: VBoxManage -q modifyvm "boinc_dd914e0708f92935" --usb off 
Exit Code: 0
Output:

2025-02-17 08:53:59 (34276): 
Command: VBoxManage -q modifyvm "boinc_dd914e0708f92935" --uart1 off --uart2 off 
Exit Code: 0
Output:

2025-02-17 08:53:59 (34276): 
Command: VBoxManage -q modifyvm "boinc_dd914e0708f92935" --lpt1 off --lpt2 off 
Exit Code: 0
Output:

2025-02-17 08:53:59 (34276): 
Command: VBoxManage -q modifyvm "boinc_dd914e0708f92935" --audio none 
Exit Code: 0
Output:
Warning: --audio is deprecated and will be removed soon. Use --audio-driver instead!

2025-02-17 08:54:00 (34276): 
Command: VBoxManage -q modifyvm "boinc_dd914e0708f92935" --clipboard disabled 
Exit Code: 0
Output:

2025-02-17 08:54:00 (34276): 
Command: VBoxManage -q modifyvm "boinc_dd914e0708f92935" --draganddrop disabled 
Exit Code: 0
Output:

2025-02-17 08:54:00 (34276): 
Command: VBoxManage -q storagectl "boinc_dd914e0708f92935" --name "Hard Disk Controller" --add "sata" --controller "IntelAHCI" --hostiocache off --portcount 3
Exit Code: 0
Output:

2025-02-17 08:54:00 (34276): 
Command: VBoxManage -q showhdinfo "C:\ProgramData\BOINC/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\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

2025-02-17 08:54:01 (34276): 
Command: VBoxManage -q storageattach "boinc_dd914e0708f92935" --storagectl "Hard Disk Controller" --port 0 --device 0 --type hdd --mtype multiattach --medium "C:\ProgramData\BOINC/projects/lhcathome.cern.ch_lhcathome/ATLAS_vbox_3.01_image.vdi" 
Exit Code: -2135228409
Output:
VBoxManage.exe: error: Cannot attach medium 'C:\ProgramData\BOINC\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 785 of file VBoxManageStorageController.cpp

2025-02-17 08:54:01 (34276): 
Command: VBoxManage -q closemedium "C:\ProgramData\BOINC/projects/lhcathome.cern.ch_lhcathome/ATLAS_vbox_3.01_image.vdi" 
Exit Code: 0
Output:

2025-02-17 08:54:02 (34276): 
Command: VBoxManage -q showhdinfo "C:\ProgramData\BOINC/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\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

2025-02-17 08:54:03 (34276): 
Command: VBoxManage -q storageattach "boinc_dd914e0708f92935" --storagectl "Hard Disk Controller" --port 0 --device 0 --type hdd --medium "C:\ProgramData\BOINC/projects/lhcathome.cern.ch_lhcathome/ATLAS_vbox_3.01_image.vdi" 
Exit Code: 0
Output:

2025-02-17 08:54:03 (34276): 
Command: VBoxManage -q storageattach "boinc_dd914e0708f92935" --storagectl "Hard Disk Controller" --port 0 --device 0 --type hdd --medium none 
Exit Code: 0
Output:

2025-02-17 08:54:03 (34276): 
Command: VBoxManage -q storageattach "boinc_dd914e0708f92935" --storagectl "Hard Disk Controller" --port 0 --device 0 --type hdd --mtype multiattach --medium "C:\ProgramData\BOINC/projects/lhcathome.cern.ch_lhcathome/ATLAS_vbox_3.01_image.vdi" 
Exit Code: 0
Output:

2025-02-17 08:54:03 (34276): 
Command: VBoxManage -q storageattach "boinc_dd914e0708f92935" --storagectl "Hard Disk Controller" --port 1 --device 0 --type dvddrive --medium "C:\Program Files\Oracle\VirtualBox/VBoxGuestAdditions.iso" 
Exit Code: 0
Output:

2025-02-17 08:54:04 (34276): 
Command: VBoxManage -q bandwidthctl "boinc_dd914e0708f92935" add "boinc_dd914e0708f92935_net" --type network --limit 1024G 
Exit Code: 0
Output:

2025-02-17 08:54:04 (34276): 
Command: VBoxManage -q modifyvm "boinc_dd914e0708f92935" --natpf1 ",tcp,127.0.0.1,59032,,80" 
Exit Code: 0
Output:

2025-02-17 08:54:04 (34276): 
Command: VBoxManage -q list extpacks
Exit Code: 0
Output:
Extension Packs: 1
Pack no. 0:   Oracle VM VirtualBox Extension Pack
Version:        6.1.26
Revision:       145957
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
Crypto Module:  
Usable:         false
Why unusable:   VBoxExtPackRegister returned VERR_VERSION_MISMATCH, pReg=0000000000000000 ErrInfo='Helper version mismatch - expected 0x3 got 0x50000'

2025-02-17 08:54:05 (34276): 
Command: VBoxManage -q modifyvm "boinc_dd914e0708f92935" --vrde on --vrdeextpack default --vrdeauthlibrary default --vrdeauthtype null --vrdeport 59033 
Exit Code: 0
Output:

2025-02-17 08:54:05 (34276): 
Command: VBoxManage -q sharedfolder add "boinc_dd914e0708f92935" --name "shared" --hostpath "C:\ProgramData\BOINC\slots\5/shared"
Exit Code: 0
Output:

2025-02-17 08:54:12 (34276): 
Command: VBoxManage -q startvm "boinc_dd914e0708f92935" --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_dd914e0708f92935" to power on...

2025-02-17 08:54:12 (34276): 
Command: VBoxManage -q snapshot "boinc_dd914e0708f92935" list 
Exit Code: -108
Output:
This machine does not have any snapshots

2025-02-17 08:54:12 (34276): 
Command: VBoxManage -q bandwidthctl "boinc_dd914e0708f92935" remove "boinc_dd914e0708f92935_net" 
Exit Code: 0
Output:
VBoxManage.exe: error: Bandwidth groups cannot be deleted while the VM is running

2025-02-17 08:54:12 (34276): 
Command: VBoxManage -q unregistervm "boinc_dd914e0708f92935" --delete 
Exit Code: -2135228409
Output:
VBoxManage.exe: error: Cannot unregister the machine 'boinc_dd914e0708f92935' 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(fDeleteAll ? CleanupMode_DetachAllReturnHardDisksAndVMRemovable :CleanupMode_DetachAllReturnHardDisksOnly, ComSafeArrayAsOutParam(aMedia))" at line 236 of file VBoxManageMisc.cpp

2025-02-17 08:54:14 (34276): 
Command: VBoxManage -q unregistervm "boinc_dd914e0708f92935" --delete 
Exit Code: 0
Output:
0%...10%...20%...30%...40%...50%...60%...70%...80%...90%...100%

08:54:19 (34276): called boinc_finish(-2147467259)

</stderr_txt>
]]>


©2025 CERN