Regression in nested virtualization on 5.13.0-19-generic

[Jo Shields]

I have a Windows 11 KVM VM I use for work. After updating to Ubuntu 21.10 from 21.04, it has started locking up on boot (regardless of whether or not I enable a virtual TPM). I tried reinstalling the VM with Windows' "Reset PC" function, which restored boot - until I installed WSL2, which depends on HyperV virtualization. After installing WSL2, it was failing exactly as before.

However, if I boot with my old 21.04 kernel, linux-image-5.11.0-37-generic, the VM boots fine. This indicates a regression lies in the nested virtualization, i.e. HyperV-in-KVM

Description: Ubuntu 21.10
Release: 21.10
linux-image-5.13.0-19-generic 5.13.0-19.19

ProblemType: Bug
DistroRelease: Ubuntu 21.10
Package: linux-image-5.13.0-19-generic 5.13.0-19.19
ProcVersionSignature: Ubuntu 5.13.0-19.19-generic 5.13.14
Uname: Linux 5.13.0-19-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.11-0ubuntu70
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC1: directhex 2171 F.... pulseaudio
 /dev/snd/controlC0: directhex 2171 F.... pulseaudio
CasperMD5CheckResult: unknown
CurrentDesktop: ubuntu:GNOME
Date: Fri Oct 15 07:27:40 2021
InstallationDate: Installed on 2020-09-25 (384 days ago)
InstallationMedia: Ubuntu 20.04.1 LTS "Focal Fossa" - Release amd64 (20200731)
MachineType: ASUS System Product Name
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcFB: 0 EFI VGA
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-5.13.0-19-generic root=UUID=89f31b08-a440-4c05-bca7-8003eca91a4c ro quiet splash vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-5.13.0-19-generic N/A
 linux-backports-modules-5.13.0-19-generic N/A
 linux-firmware 1.201
SourcePackage: linux
UpgradeStatus: Upgraded to impish on 2021-10-14 (0 days ago)
dmi.bios.date: 08/11/2021
dmi.bios.release: 5.17
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 2423
dmi.board.asset.tag: Default string
dmi.board.name: ROG STRIX B550-I GAMING
dmi.board.vendor: ASUSTeK COMPUTER INC.
dmi.board.version: Rev X.0x
dmi.chassis.asset.tag: Default string
dmi.chassis.type: 3
dmi.chassis.vendor: Default string
dmi.chassis.version: Default string
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr2423:bd08/11/2021:br5.17:svnASUS:pnSystemProductName:pvrSystemVersion:skuSKU:rvnASUSTeKCOMPUTERINC.:rnROGSTRIXB550-IGAMING:rvrRevX.0x:cvnDefaultstring:ct3:cvrDefaultstring:
dmi.product.family: To be filled by O.E.M.
dmi.product.name: System Product Name
dmi.product.sku: SKU
dmi.product.version: System Version
dmi.sys.vendor: ASUS

[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

This change was made by a bot.