Name | Theory_2922-4764800-297_2 |
Workunit | 235436704 |
Created | 7 Oct 2025, 1:45:57 UTC |
Sent | 7 Oct 2025, 23:02:28 UTC |
Report deadline | 18 Oct 2025, 23:02:28 UTC |
Received | 8 Oct 2025, 12:06:52 UTC |
Server state | Over |
Outcome | Computation error |
Client state | Compute error |
Exit status | -2147467259 (0x80004005) Unknown error code |
Computer ID | 10650368 |
Run time | 6 sec |
CPU time | |
Validate state | Invalid |
Credit | 0.00 |
Device peak FLOPS | 6.40 GFLOPS |
Application version | Theory Simulation v301.00 (vbox64_theory) windows_x86_64 |
Peak working set size | 12.21 MB |
Peak swap size | 2.40 MB |
Peak disk usage | 1.11 MB |
<core_client_version>8.2.4</core_client_version> <![CDATA[ <message> Erreur non sp�cifi�e (0x80004005) - exit code 2147500037 (0x80004005)</message> <stderr_txt> 2025-10-08 01:26:22 (20708): vboxwrapper version 26210 2025-10-08 01:26:22 (20708): BOINC client version: 8.2.4 2025-10-08 01:26:23 (20708): Detected: VirtualBox VboxManage Interface (Version: 7.2.0) 2025-10-08 01:26:23 (20708): Detected: Heartbeat check (file: 'heartbeat' every 1800.000000 seconds) 2025-10-08 01:26:23 (20708): Successfully copied 'init_data.xml' to the shared directory. 2025-10-08 01:26:23 (20708): Successfully copied 'input' to the shared directory. 2025-10-08 01:26:23 (20708): Create VM. (boinc_5bfe2036bd06cca7, slot#4) 2025-10-08 01:26:24 (20708): Setting Memory Size for VM. (1024MB) 2025-10-08 01:26:24 (20708): Setting CPU Count for VM. (1) 2025-10-08 01:26:24 (20708): Setting Chipset Options for VM. 2025-10-08 01:26:25 (20708): Setting Graphics Controller Options for VM. (Driver: VBoxVGA, 16MB) 2025-10-08 01:26:25 (20708): Setting Boot Options for VM. 2025-10-08 01:26:26 (20708): Setting Network Configuration for NAT. (Driver: virtio) 2025-10-08 01:26:26 (20708): Enabling VM Network Access. 2025-10-08 01:26:26 (20708): Disabling USB Support for VM. 2025-10-08 01:26:26 (20708): Disabling COM Port Support for VM. 2025-10-08 01:26:27 (20708): Disabling LPT Port Support for VM. 2025-10-08 01:26:27 (20708): Disabling Audio Support for VM. 2025-10-08 01:26:27 (20708): Disabling Clipboard Support for VM. 2025-10-08 01:26:27 (20708): Disabling Drag and Drop Support for VM. 2025-10-08 01:26:28 (20708): Adding storage controller(s) to VM. 2025-10-08 01:26:28 (20708): Adding virtual disk drive to VM. (Theory_2025_08_13_prod.vdi) 2025-10-08 01:26:30 (20708): Adding VirtualBox Guest Additions to VM. 2025-10-08 01:26:32 (20708): Adding network bandwidth throttle group to VM. (Defaulting to 1024GB) 2025-10-08 01:26:32 (20708): forwarding host port 62965 to guest port 80 2025-10-08 01:26:32 (20708): Enabling remote desktop for VM. 2025-10-08 01:26:33 (20708): Required extension pack not installed, remote desktop not enabled. 2025-10-08 01:26:33 (20708): Enabling shared directory for VM. 2025-10-08 01:26:33 (20708): Starting VM using VBoxManage interface. (boinc_5bfe2036bd06cca7, slot#4) 2025-10-08 01:26:37 (20708): Error in start VM for VM: -2147467259 Command: VBoxManage -q startvm "boinc_5bfe2036bd06cca7" --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_5bfe2036bd06cca7" to power on... 2025-10-08 01:26:37 (20708): VM failed to start. 2025-10-08 01:26:37 (20708): Could not start 2025-10-08 01:26:37 (20708): ERROR: VM failed to start 2025-10-08 01:26:37 (20708): Powering off VM. 2025-10-08 01:26:37 (20708): Deregistering VM. (boinc_5bfe2036bd06cca7, slot#4) 2025-10-08 01:26:37 (20708): Removing network bandwidth throttle group from VM. 2025-10-08 01:26:38 (20708): Removing VM from VirtualBox. Hypervisor System Log: 00:00:13.892300 Launched VM: 2678720496 pid: 3936 (0xf60) frontend: headless name: boinc_7f53213540e59a75 00:00:14.181763 Platform architecture set to 'x86' 00:00:14.272981 Saving settings file "C:\ProgramData\BOINC\slots\1\boinc_b412818d5c04c8f2\boinc_b412818d5c04c8f2.vbox" with version "1.19-windows" 00:00:14.275341 Finished saving settings file "C:\ProgramData\BOINC\slots\1\boinc_b412818d5c04c8f2\boinc_b412818d5c04c8f2.vbox" 00:00:14.348086 Platform architecture set to 'x86' 00:00:14.349541 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 00:00:14.401137 Platform architecture set to 'x86' 00:00:14.402571 Saving settings file "C:\ProgramData\BOINC\slots\1\boinc_b412818d5c04c8f2\boinc_b412818d5c04c8f2.vbox" with version "1.19-windows" 00:00:14.406130 Finished saving settings file "C:\ProgramData\BOINC\slots\1\boinc_b412818d5c04c8f2\boinc_b412818d5c04c8f2.vbox" 00:00:14.619056 Platform architecture set to 'x86' 00:00:14.658270 Saving settings file "C:\Users\nutte\.VirtualBox\VirtualBox.xml" with version "1.12-windows" 00:00:14.661231 Finished saving settings file "C:\Users\nutte\.VirtualBox\VirtualBox.xml" 00:00:14.661364 Saving settings file "C:\Users\nutte\.VirtualBox\VirtualBox.xml" with version "1.12-windows" 00:00:14.664372 Finished saving settings file "C:\Users\nutte\.VirtualBox\VirtualBox.xml" 00:00:14.665271 DeleteVM Saving settings file "C:\Users\nutte\.VirtualBox\VirtualBox.xml" with version "1.12-windows" 00:00:14.668678 DeleteVM Finished saving settings file "C:\Users\nutte\.VirtualBox\VirtualBox.xml" 00:00:14.726708 Saving settings file "C:\ProgramData\BOINC\slots\5\boinc_7673e04072d0defc\boinc_7673e04072d0defc.vbox" with version "1.19-windows" 00:00:14.727413 Platform architecture set to 'x86' 00:00:14.730576 Finished saving settings file "C:\ProgramData\BOINC\slots\5\boinc_7673e04072d0defc\boinc_7673e04072d0defc.vbox" 00:00:14.788881 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 00:00:15.098458 Saving settings file "C:\Users\nutte\.VirtualBox\VirtualBox.xml" with version "1.12-windows" 00:00:15.136475 Finished saving settings file "C:\Users\nutte\.VirtualBox\VirtualBox.xml" 00:00:15.137585 DeleteVM Saving settings file "C:\ProgramData\BOINC\slots\4\boinc_5bfe2036bd06cca7\boinc_5bfe2036bd06cca7.vbox" with version "1.19-windows" 00:00:15.140783 DeleteVM Finished saving settings file "C:\ProgramData\BOINC\slots\4\boinc_5bfe2036bd06cca7\boinc_5bfe2036bd06cca7.vbox" 00:00:15.159389 Saving settings file "C:\ProgramData\BOINC\slots\4\boinc_5bfe2036bd06cca7\boinc_5bfe2036bd06cca7.vbox" with version "1.19-windows" 00:00:15.161709 Finished saving settings file "C:\ProgramData\BOINC\slots\4\boinc_5bfe2036bd06cca7\boinc_5bfe2036bd06cca7.vbox" 00:00:15.225401 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 00:00:15.292553 Saving settings file "C:\ProgramData\BOINC\slots\2\boinc_37c761ce192068dc\boinc_37c761ce192068dc.vbox" with version "1.19-windows" 00:00:15.328816 Finished saving settings file "C:\ProgramData\BOINC\slots\2\boinc_37c761ce192068dc\boinc_37c761ce192068dc.vbox" 00:00:15.386644 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 00:00:15.533961 Saving settings file "C:\Users\nutte\.VirtualBox\VirtualBox.xml" with version "1.12-windows" 00:00:15.544812 Finished saving settings file "C:\Users\nutte\.VirtualBox\VirtualBox.xml" 00:00:15.545032 Saving settings file "C:\ProgramData\BOINC\slots\2\boinc_37c761ce192068dc\boinc_37c761ce192068dc.vbox" with version "1.19-windows" 00:00:15.547867 Finished saving settings file "C:\ProgramData\BOINC\slots\2\boinc_37c761ce192068dc\boinc_37c761ce192068dc.vbox" 00:00:15.548862 DeleteVM Saving settings file "C:\ProgramData\BOINC\slots\2\boinc_37c761ce192068dc\boinc_37c761ce192068dc.vbox" with version "1.19-windows" 00:00:15.550841 DeleteVM Finished saving settings file "C:\ProgramData\BOINC\slots\2\boinc_37c761ce192068dc\boinc_37c761ce192068dc.vbox" 00:00:15.576148 Platform architecture set to 'x86' 00:00:16.089037 Saving settings file "C:\ProgramData\BOINC\slots\3\boinc_5a23b2a77085cae2\boinc_5a23b2a77085cae2.vbox" with version "1.19-windows" 00:00:16.126329 Finished saving settings file "C:\ProgramData\BOINC\slots\3\boinc_5a23b2a77085cae2\boinc_5a23b2a77085cae2.vbox" 00:00:16.185259 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 00:00:16.497385 Saving settings file "C:\Users\nutte\.VirtualBox\VirtualBox.xml" with version "1.12-windows" 00:00:16.534675 Finished saving settings file "C:\Users\nutte\.VirtualBox\VirtualBox.xml" 00:00:16.535608 DeleteVM Saving settings file "C:\ProgramData\BOINC\slots\2\boinc_37c761ce192068dc\boinc_37c761ce192068dc.vbox" with version "1.19-windows" 00:00:16.537397 DeleteVM Finished saving settings file "C:\ProgramData\BOINC\slots\2\boinc_37c761ce192068dc\boinc_37c761ce192068dc.vbox" 00:00:17.361879 Platform architecture set to 'x86' 00:00:17.875688 Saving settings file "C:\ProgramData\BOINC\slots\6\boinc_7f53213540e59a75\boinc_7f53213540e59a75.vbox" with version "1.19-windows" 00:00:17.915814 Finished saving settings file "C:\ProgramData\BOINC\slots\6\boinc_7f53213540e59a75\boinc_7f53213540e59a75.vbox" 00:00:17.981911 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 00:00:18.331739 Saving settings file "C:\Users\nutte\.VirtualBox\VirtualBox.xml" with version "1.12-windows" 00:00:18.334537 Finished saving settings file "C:\Users\nutte\.VirtualBox\VirtualBox.xml" 00:00:18.335504 DeleteVM Saving settings file "C:\ProgramData\BOINC\slots\2\boinc_37c761ce192068dc\boinc_37c761ce192068dc.vbox" with version "1.19-windows" 00:00:18.338516 DeleteVM Finished saving settings file "C:\ProgramData\BOINC\slots\2\boinc_37c761ce192068dc\boinc_37c761ce192068dc.vbox" 00:00:18.679966 Saving settings file "C:\Users\nutte\.VirtualBox\VirtualBox.xml" with version "1.12-windows" 00:00:18.717057 Finished saving settings file "C:\Users\nutte\.VirtualBox\VirtualBox.xml" 00:00:18.717186 Saving settings file "C:\Users\nutte\.VirtualBox\VirtualBox.xml" with version "1.12-windows" 00:00:18.720368 Finished saving settings file "C:\Users\nutte\.VirtualBox\VirtualBox.xml" 00:00:18.721202 DeleteVM Saving settings file "C:\Users\nutte\.VirtualBox\VirtualBox.xml" with version "1.12-windows" 00:00:18.723269 DeleteVM Finished saving settings file "C:\Users\nutte\.VirtualBox\VirtualBox.xml" 00:00:23.732719 main VirtualBox: object deletion starts 00:00:23.739991 main HostDnsMonitor: shutting down ... 00:00:23.740095 main HostDnsMonitor: shut down 00:00:23.743758 Watcher ERROR [COM]: aRC=E_ACCESSDENIED (0x80070005) aIID={2ce10519-3c09-45d8-a12d-e887786146b7} aComponent={VirtualBoxWrap} aText={The object is not ready}, preserve=false aResultDetail=0 00:00:23.744050 main VirtualBox: object deleted VM Execution Log: VM Startup Log: VM Trace Log: bd06cca7\\boinc_5bfe2036bd06cca7-screen0.webm" rec_screen_opts="ac_profile=med" rec_screen_video_res_xy="1024x768" rec_screen_video_rate_kbps=512 rec_screen_video_fps=25 description="Theory_2922-4764800-297_2" GuestMemoryBalloon=0 2025-10-08 01:26:26 (20708): Command: VBoxManage -q modifyvm "boinc_5bfe2036bd06cca7" --nic1 nat --nic-type1 "virtio" --cable-connected1 off --nat-dns-proxy1 on Exit Code: 0 Output: 2025-10-08 01:26:26 (20708): Command: VBoxManage -q modifyvm "boinc_5bfe2036bd06cca7" --cable-connected1 on Exit Code: 0 Output: 2025-10-08 01:26:26 (20708): Command: VBoxManage -q modifyvm "boinc_5bfe2036bd06cca7" --usb off Exit Code: 0 Output: 2025-10-08 01:26:27 (20708): Command: VBoxManage -q modifyvm "boinc_5bfe2036bd06cca7" --uart1 off --uart2 off Exit Code: 0 Output: 2025-10-08 01:26:27 (20708): Command: VBoxManage -q modifyvm "boinc_5bfe2036bd06cca7" --lpt1 off --lpt2 off Exit Code: 0 Output: 2025-10-08 01:26:27 (20708): Command: VBoxManage -q modifyvm "boinc_5bfe2036bd06cca7" --audio-enabled off Exit Code: 0 Output: 2025-10-08 01:26:27 (20708): Command: VBoxManage -q modifyvm "boinc_5bfe2036bd06cca7" --clipboard disabled Exit Code: 0 Output: 2025-10-08 01:26:28 (20708): Command: VBoxManage -q modifyvm "boinc_5bfe2036bd06cca7" --draganddrop disabled Exit Code: 0 Output: 2025-10-08 01:26:28 (20708): Command: VBoxManage -q storagectl "boinc_5bfe2036bd06cca7" --name "Hard Disk Controller" --add "sata" --controller "IntelAHCI" --hostiocache off --portcount 3 Exit Code: 0 Output: 2025-10-08 01:26:28 (20708): Command: VBoxManage -q showhdinfo "C:\ProgramData\BOINC/projects/lhcathome.cern.ch_lhcathome/Theory_2025_08_13_prod.vdi" Exit Code: 0 Output: UUID: 045b03b5-74fd-4f58-8f68-0eee86fe796d Parent UUID: base State: created Type: multiattach Location: C:\ProgramData\BOINC\projects\lhcathome.cern.ch_lhcathome\Theory_2025_08_13_prod.vdi Storage format: VDI Format variant: dynamic default Capacity: 10240 MBytes Size on disk: 2847 MBytes Encryption: disabled Property: AllocationBlockSize=1048576 2025-10-08 01:26:29 (20708): Command: VBoxManage -q storageattach "boinc_5bfe2036bd06cca7" --storagectl "Hard Disk Controller" --port 0 --device 0 --type hdd --mtype multiattach --medium "C:\ProgramData\BOINC/projects/lhcathome.cern.ch_lhcathome/Theory_2025_08_13_prod.vdi" Exit Code: -2135228409 Output: VBoxManage.exe: error: Cannot attach medium 'C:\ProgramData\BOINC\projects\lhcathome.cern.ch_lhcathome\Theory_2025_08_13_prod.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 2025-10-08 01:26:29 (20708): Command: VBoxManage -q showhdinfo "C:\ProgramData\BOINC/projects/lhcathome.cern.ch_lhcathome/Theory_2025_08_13_prod.vdi" Exit Code: 0 Output: UUID: 045b03b5-74fd-4f58-8f68-0eee86fe796d Parent UUID: base State: created Type: multiattach Location: C:\ProgramData\BOINC\projects\lhcathome.cern.ch_lhcathome\Theory_2025_08_13_prod.vdi Storage format: VDI Format variant: dynamic default Capacity: 10240 MBytes Size on disk: 2847 MBytes Encryption: disabled Property: AllocationBlockSize=1048576 2025-10-08 01:26:29 (20708): Command: VBoxManage -q closemedium disk "C:\ProgramData\BOINC\projects\lhcathome.cern.ch_lhcathome\Theory_2025_08_13_prod.vdi" Exit Code: 0 Output: 2025-10-08 01:26:29 (20708): Command: VBoxManage -q showhdinfo "C:\ProgramData\BOINC/projects/lhcathome.cern.ch_lhcathome/Theory_2025_08_13_prod.vdi" Exit Code: 0 Output: UUID: 045b03b5-74fd-4f58-8f68-0eee86fe796d Parent UUID: base State: created Type: normal (base) Location: C:\ProgramData\BOINC\projects\lhcathome.cern.ch_lhcathome\Theory_2025_08_13_prod.vdi Storage format: VDI Format variant: dynamic default Capacity: 10240 MBytes Size on disk: 2847 MBytes Encryption: disabled Property: AllocationBlockSize=1048576 2025-10-08 01:26:30 (20708): Command: VBoxManage -q storageattach "boinc_5bfe2036bd06cca7" --storagectl "Hard Disk Controller" --port 0 --device 0 --type hdd --medium "C:\ProgramData\BOINC/projects/lhcathome.cern.ch_lhcathome/Theory_2025_08_13_prod.vdi" Exit Code: 0 Output: 2025-10-08 01:26:30 (20708): Command: VBoxManage -q storageattach "boinc_5bfe2036bd06cca7" --storagectl "Hard Disk Controller" --port 0 --device 0 --type hdd --medium none Exit Code: 0 Output: 2025-10-08 01:26:30 (20708): Command: VBoxManage -q storageattach "boinc_5bfe2036bd06cca7" --storagectl "Hard Disk Controller" --port 0 --device 0 --type hdd --mtype multiattach --medium "C:\ProgramData\BOINC/projects/lhcathome.cern.ch_lhcathome/Theory_2025_08_13_prod.vdi" Exit Code: 0 Output: 2025-10-08 01:26:30 (20708): Command: VBoxManage -q storageattach "boinc_5bfe2036bd06cca7" --storagectl "Hard Disk Controller" --port 1 --device 0 --type dvddrive --medium "C:\Program Files\Oracle\VirtualBox/VBoxGuestAdditions.iso" Exit Code: -2147024809 Output: VBoxManage.exe: error: Cannot register the DVD image 'C:\Program Files\Oracle\VirtualBox\VBoxGuestAdditions.iso' {47694351-7c38-4c25-b6c5-cec088721f46} because a CD/DVD image 'C:\Program Files\Oracle\VirtualBox\VBoxGuestAdditions.iso' with UUID {2dc480c7-e441-40ed-9a26-5ab17910bcd8} already exists VBoxManage.exe: error: Details: code E_INVALIDARG (0x80070057), component VirtualBoxWrap, interface IVirtualBox, callee IUnknown VBoxManage.exe: error: Context: "OpenMedium(Bstr(pszFilenameOrUuid).raw(), enmDevType, enmAccessMode, fForceNewUuidOnOpen, pMedium.asOutParam())" at line 201 of file VBoxManageDisk.cpp VBoxManage.exe: error: Invalid UUID or filename "C:\Program Files\Oracle\VirtualBox/VBoxGuestAdditions.iso" 2025-10-08 01:26:32 (20708): Command: VBoxManage -q storageattach "boinc_5bfe2036bd06cca7" --storagectl "Hard Disk Controller" --port 1 --device 0 --type dvddrive --medium "C:\Program Files\Oracle\VirtualBox/VBoxGuestAdditions.iso" Exit Code: 0 Output: 2025-10-08 01:26:32 (20708): Command: VBoxManage -q bandwidthctl "boinc_5bfe2036bd06cca7" add "boinc_5bfe2036bd06cca7_net" --type network --limit 1024G Exit Code: 0 Output: 2025-10-08 01:26:32 (20708): Command: VBoxManage -q modifyvm "boinc_5bfe2036bd06cca7" --natpf1 ",tcp,127.0.0.1,62965,,80" Exit Code: 0 Output: 2025-10-08 01:26:33 (20708): Command: VBoxManage -q list extpacks Exit Code: 0 Output: Extension Packs: 0 2025-10-08 01:26:33 (20708): Command: VBoxManage -q sharedfolder add "boinc_5bfe2036bd06cca7" --name "shared" --hostpath "C:\ProgramData\BOINC\slots\4/shared" Exit Code: 0 Output: 2025-10-08 01:26:37 (20708): Command: VBoxManage -q startvm "boinc_5bfe2036bd06cca7" --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_5bfe2036bd06cca7" to power on... 2025-10-08 01:26:37 (20708): Command: VBoxManage -q snapshot "boinc_5bfe2036bd06cca7" list Exit Code: -108 Output: This machine does not have any snapshots 2025-10-08 01:26:38 (20708): Command: VBoxManage -q bandwidthctl "boinc_5bfe2036bd06cca7" remove "boinc_5bfe2036bd06cca7_net" Exit Code: 0 Output: VBoxManage.exe: error: Bandwidth groups cannot be deleted while the VM is running 2025-10-08 01:26:38 (20708): Command: VBoxManage -q unregistervm "boinc_5bfe2036bd06cca7" --delete Exit Code: 0 Output: 0%...10%...20%...30%...40%...50%...60%...70%...80%...90%...100% 2025-10-08 01:26:46 (20708): called boinc_finish(-2147467259) </stderr_txt> ]]>
©2025 CERN