Public bug reported: I has always been able to both read and write "/proc/sys/kernel/nmi_watchdog" file. After the recent kernel update (4.4.0-108-generic, updated on 10-Jan-2018) the computer merely gets stuck on these commands. Ctrl-C cannot interrupt.
ProblemType: Bug DistroRelease: Ubuntu 16.04 Package: linux-image-4.4.0-108-generic 4.4.0-108.131 ProcVersionSignature: Ubuntu 4.4.0-108.131-generic 4.4.98 Uname: Linux 4.4.0-108-generic x86_64 AlsaVersion: Advanced Linux Sound Architecture Driver Version k4.4.0-108-generic. AplayDevices: Error: [Errno 2] No such file or directory: 'aplay' ApportVersion: 2.20.1-0ubuntu2.15 Architecture: amd64 ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord' AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/by-path', '/dev/snd/hwC0D2', '/dev/snd/hwC0D0', '/dev/snd/pcmC0D7p', '/dev/snd/pcmC0D3p', '/dev/snd/pcmC0D2c', '/dev/snd/pcmC0D1p', '/dev/snd/pcmC0D0c', '/dev/snd/pcmC0D0p', '/dev/snd/controlC0', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1: Card0.Amixer.info: Error: [Errno 2] No such file or directory: 'amixer' Card0.Amixer.values: Error: [Errno 2] No such file or directory: 'amixer' Date: Wed Jan 10 12:30:37 2018 HibernationDevice: RESUME=UUID=a0f49bd7-5ec0-414e-8183-41221652c849 InstallationDate: Installed on 2016-08-17 (510 days ago) InstallationMedia: Ubuntu-Server 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719) IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig' Lsusb: Bus 001 Device 003: ID 04b4:6570 Cypress Semiconductor Corp. Bus 001 Device 002: ID 8087:07e6 Intel Corp. Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub MachineType: CompuLab Ltd. SBC-iBT ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-108-generic.efi.signed root=UUID=1ee7c5d5-a843-43d4-a90d-0c484d09d041 ro RelatedPackageVersions: linux-restricted-modules-4.4.0-108-generic N/A linux-backports-modules-4.4.0-108-generic N/A linux-firmware 1.157.14 RfKill: Error: [Errno 2] No such file or directory: 'rfkill' SourcePackage: linux UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 02/24/2015 dmi.bios.vendor: CompuLab Ltd. dmi.bios.version: SBC-iBT_3.1.0.314 X64 dmi.board.asset.tag: None dmi.board.name: SBC-iBT dmi.board.vendor: CompuLab Ltd. dmi.board.version: 1.x dmi.chassis.asset.tag: Asset Tag dmi.chassis.type: 11 dmi.chassis.vendor: CompuLab Ltd. dmi.chassis.version: 1.0 dmi.modalias: dmi:bvnCompuLabLtd.:bvrSBC-iBT_3.1.0.314X64:bd02/24/2015:svnCompuLabLtd.:pnSBC-iBT:pvr1.x:rvnCompuLabLtd.:rnSBC-iBT:rvr1.x:cvnCompuLabLtd.:ct11:cvr1.0: dmi.product.name: SBC-iBT dmi.product.version: 1.x dmi.sys.vendor: CompuLab Ltd. ** Affects: linux (Ubuntu) Importance: Undecided Status: New ** Tags: amd64 apport-bug xenial -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1742418 Title: Stuck attempting to acess "/proc/sys/kernel/nmi_watchdog" file To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1742418/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs