** Description changed: - Fresh install of 26.04 server into a hyper-v VM. If hyper-v dynamic memory is enabled, after 5 minutes the CPU shows multiple system processes at 100% and OOM killer messages start getting printed to the console followed by a reboot. + Fresh install of 26.04 server into a hyper-v VM running on a Win11 25H2 host (not Azure). If hyper-v dynamic memory is enabled, after 5 minutes the CPU shows multiple system processes at 100% and OOM killer messages start getting printed to the console followed by a reboot. "linux-virtual linux-cloud-tools-virtual linux-tools-virtual" all installed in the VM. - The issue happens with both the generic and azure kernels. + The issue reproduces with both the generic and azure kernels. Disabling dynamic memory in the VM config fixes the issue, but this was never a problem with 24.04 ProblemType: Bug DistroRelease: Ubuntu 26.04 Package: linux-image-7.0.0-1004-azure 7.0.0-1004.4 ProcVersionSignature: Ubuntu 7.0.0-1004.4-azure 7.0.0 Uname: Linux 7.0.0-1004-azure x86_64 AlsaDevices: Error: command ['ls', '-l', '/dev/snd/'] failed with exit code 2: ls: cannot access '/dev/snd/': No such file or directory AplayDevices: Error: [Errno 2] No such file or directory: 'aplay' ApportVersion: 2.34.0-0ubuntu2 Architecture: amd64 ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord' CRDA: N/A CasperMD5CheckResult: pass CurrentDmesg: Error: command ['dmesg'] failed with exit code 1: dmesg: read kernel buffer failed: Operation not permitted Date: Mon May 25 14:44:19 2026 InstallationDate: Installed on 2026-05-25 (0 days ago) InstallationMedia: Ubuntu-Server 26.04 "Resolute Raccoon" - Release amd64 (20260420.1) Lspci: - + Lspci-vt: - + Lsusb: Error: command ['lsusb'] failed with exit code 1: Lsusb-t: - + Lsusb-v: Error: command ['lsusb', '-v'] failed with exit code 1: MachineType: Microsoft Corporation Virtual Machine PciMultimedia: - + ProcEnviron: - LANG=en_US.UTF-8 - PATH=(custom, no user) - SHELL=/bin/bash - TERM=xterm-256color - XDG_RUNTIME_DIR=<set> + LANG=en_US.UTF-8 + PATH=(custom, no user) + SHELL=/bin/bash + TERM=xterm-256color + XDG_RUNTIME_DIR=<set> ProcFB: 0 hyperv_drmdrmfb ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-7.0.0-1004-azure root=/dev/mapper/ubuntu--vg-ubuntu--lv ro crashkernel=2G-4G:320M,4G-32G:512M,32G-64G:1024M,64G-128G:2048M,128G-:4096M RfKill: Error: [Errno 2] No such file or directory: 'rfkill' SourcePackage: linux-azure UpgradeStatus: No upgrade log present (probably fresh install) acpidump: - + dmi.bios.date: 09/25/2025 dmi.bios.release: 4.1 dmi.bios.vendor: Microsoft Corporation dmi.bios.version: Hyper-V UEFI Release v4.1 dmi.board.asset.tag: None dmi.board.name: Virtual Machine dmi.board.vendor: Microsoft Corporation dmi.board.version: Hyper-V UEFI Release v4.1 dmi.chassis.asset.tag: 2709-8481-9031-1712-6660-9670-79 dmi.chassis.type: 3 dmi.chassis.vendor: Microsoft Corporation dmi.chassis.version: Hyper-V UEFI Release v4.1 dmi.modalias: dmi:bvnMicrosoftCorporation:bvrHyper-VUEFIReleasev4.1:bd09/25/2025:br4.1:svnMicrosoftCorporation:pnVirtualMachine:pvrHyper-VUEFIReleasev4.1:rvnMicrosoftCorporation:rnVirtualMachine:rvrHyper-VUEFIReleasev4.1:cvnMicrosoftCorporation:ct3:cvrHyper-VUEFIReleasev4.1:skuNone:pfaVirtualMachine: dmi.product.family: Virtual Machine dmi.product.name: Virtual Machine dmi.product.sku: None dmi.product.version: Hyper-V UEFI Release v4.1 dmi.sys.vendor: Microsoft Corporation
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2154198 Title: OOM killer reboot loop in hyper-v VM To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-azure/+bug/2154198/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
