Public bug reported:
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.
"linux-virtual linux-cloud-tools-virtual linux-tools-virtual" all installed in
the VM.
The issue happens 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>
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
** Affects: ubuntu
Importance: Undecided
Status: New
** Tags: amd64 apport-bug resolute
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https://bugs.launchpad.net/bugs/2154198
Title:
OOM killer reboot loop in hyper-v VM
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