Changing VM settings in /etc/sysctl.conf seems to have resolved freezes on my Ubuntu 22.04.3 kernel 5.15.0-88 server
I added the following at the end of /etc/sysctl.conf : vm.min_free_kbytes = 2097152 vm.swappiness = 5 vm.dirty_background_ratio = 5 vm.dirty_ratio = 10 vm.dirty_writeback_centisecs = 500 vm.dirty_expire_centisecs = 3000 Then I ran sysctl -p /etc/sysctl.conf ... to perm save settings vm.min_free_kbytes and vm.swappiness seems to be the main ones doing the trick. These settings depend on your server config and main use so be sure to adapt accordingly. Documention can be found here : https://sysctl-explorer.net/vm I used <stress> tool to test new settings and <htop> to monitor cpu and mem alloc. i.e. stress --vm 8 --vm-bytes 8G --timeout 300 to stress test mem up to 64GB using 8 vm workers spinning during 5 minutes. For info, I have a 8GB swap Before changing these settings (=> default values), my server freezed when stress testing it to the RAM limit not using the swap. After, it gently switched to swap when approaching the RAM limit without freezing. Hope this helps someone else... -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/2040039 Title: Ubuntu Server 22.04.3 randomly freezes Status in linux package in Ubuntu: Confirmed Bug description: Hi, I have a physical machine on which I have installed Ubuntu Server 22.04.3 . It randomly freezes. I read few forums and gathered previous boot report as well. Other information as requested: No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 22.04.3 LTS Release: 22.04 Codename: jammy ProblemType: Bug DistroRelease: Ubuntu 22.04 Package: linux-image-5.15.0-87-generic 5.15.0-87.97 ProcVersionSignature: Ubuntu 5.15.0-87.97-generic 5.15.122 Uname: Linux 5.15.0-87-generic x86_64 AlsaVersion: Advanced Linux Sound Architecture Driver Version k5.15.0-87-generic. AplayDevices: Error: [Errno 2] No such file or directory: 'aplay' ApportVersion: 2.20.11-0ubuntu82.5 Architecture: amd64 ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord' AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/by-path', '/dev/snd/controlC0', '/dev/snd/hwC0D2', '/dev/snd/hwC0D0', '/dev/snd/pcmC0D10p', '/dev/snd/pcmC0D9p', '/dev/snd/pcmC0D8p', '/dev/snd/pcmC0D7p', '/dev/snd/pcmC0D3p', '/dev/snd/pcmC0D2c', '/dev/snd/pcmC0D0c', '/dev/snd/pcmC0D0p', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1: CRDA: N/A Card0.Amixer.info: Error: [Errno 2] No such file or directory: 'amixer' Card0.Amixer.values: Error: [Errno 2] No such file or directory: 'amixer' CasperMD5CheckResult: pass CloudArchitecture: x86_64 CloudID: none CloudName: none CloudPlatform: none CloudSubPlatform: config Date: Sat Oct 21 02:41:33 2023 InstallationDate: Installed on 2023-09-19 (31 days ago) InstallationMedia: Ubuntu-Server 22.04.3 LTS "Jammy Jellyfish" - Release amd64 (20230810) IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig' Lsusb: Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Lsusb-t: /: Bus 02.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/4p, 20000M/x2 /: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/16p, 480M MachineType: Gigabyte Technology Co., Ltd. H510M H ProcEnviron: TERM=xterm-256color PATH=(custom, no user) XDG_RUNTIME_DIR=<set> LANG=en_US.UTF-8 SHELL=/bin/bash ProcFB: ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-5.15.0-87-generic root=/dev/mapper/ubuntu--vg-ubuntu--lv ro RelatedPackageVersions: linux-restricted-modules-5.15.0-87-generic N/A linux-backports-modules-5.15.0-87-generic N/A linux-firmware 20220329.git681281e4-0ubuntu3.21 RfKill: Error: [Errno 2] No such file or directory: 'rfkill' SourcePackage: linux UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 03/10/2023 dmi.bios.release: 5.19 dmi.bios.vendor: American Megatrends International, LLC. dmi.bios.version: F17 dmi.board.asset.tag: Default string dmi.board.name: H510M H dmi.board.vendor: Gigabyte Technology Co., Ltd. dmi.board.version: x.x dmi.chassis.asset.tag: Default string dmi.chassis.type: 3 dmi.chassis.vendor: Default string dmi.chassis.version: Default string dmi.modalias: dmi:bvnAmericanMegatrendsInternational,LLC.:bvrF17:bd03/10/2023:br5.19:svnGigabyteTechnologyCo.,Ltd.:pnH510MH:pvr-CF:rvnGigabyteTechnologyCo.,Ltd.:rnH510MH:rvrx.x:cvnDefaultstring:ct3:cvrDefaultstring:skuDefaultstring: dmi.product.family: H510 MB dmi.product.name: H510M H dmi.product.sku: Default string dmi.product.version: -CF dmi.sys.vendor: Gigabyte Technology Co., Ltd. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2040039/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
