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** Changed in: linux (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/2019108
Title:
XSAVE consistency problem preventing avx on KVM guests
Status in linux package in Ubuntu:
Incomplete
Bug description:
On an openstack KVM guest VM the following kernel message is
displayed: "XSAVE consistency problem: size 2560 != kernel_size 0"
(see further traces collected through "ubuntu-bug linux" command)
As a result, the avx feature isn't enabled in the kernel, failing some
programs that require it (e.g mongodb requires avx instruction set).
This problem reproduces on 23.04 Lua kernel (6.2.0-20), 22.04 Jammy
HWE kernel (5.19.0-35) but not on Jammy GA kernel (5.15.0-71.78).
I'm suspecting a kernel regression since v>5.15 that would be more
strict with possibly QEMU emulated XSAVE CPUID features.
Related yet unanswered support question:
https://askubuntu.com/questions/1467238/xsave-consistency-problem-
preventing-avx-on-kvm-guests-running-jammy-hwe
This looks similar to the following kernel thread
https://lore.kernel.org/lkml/a60333b9-6b42-4730-6509-cf1a0cd5c...@citrix.com/T/
Although I don't yet have access to the KVM hypervisor host, I'd like
to know if there is a possible workaround by fixing KVM/QEMU
configuration possibly enabling XSAVEC in addition to XSAVES feature
in the KVM guest, for upgrading KVM/QEMU version.
Full diagnostics performed so far at https://github.com/orange-
cloudfoundry/paas-templates/issues/1960#issuecomment-1534484042
ProblemType: Bug
DistroRelease: Ubuntu 23.04
Package: linux-image-6.2.0-20-generic 6.2.0-20.20
ProcVersionSignature: Ubuntu 6.2.0-20.20-generic 6.2.6
Uname: Linux 6.2.0-20-generic x86_64
AlsaDevices:
total 0
crw-rw---- 1 root audio 116, 1 May 10 09:35 seq
crw-rw---- 1 root audio 116, 33 May 10 09:35 timer
AplayDevices: Error: [Errno 2] No such file or directory: 'aplay'
ApportVersion: 2.26.1-0ubuntu2
Architecture: amd64
ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord'
AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq',
'/dev/snd/timer'] failed with exit code 1:
CRDA: N/A
CasperMD5CheckResult: unknown
Date: Wed May 10 12:31:18 2023
IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig'
Lspci: Error: [Errno 2] No such file or directory: 'lspci'
Lspci-vt: Error: [Errno 2] No such file or directory: 'lspci'
Lsusb: Error: [Errno 2] No such file or directory: 'lsusb'
Lsusb-t: Error: [Errno 2] No such file or directory: 'lsusb'
Lsusb-v: Error: [Errno 2] No such file or directory: 'lsusb'
MachineType: OpenStack Foundation OpenStack Nova
PciMultimedia:
ProcFB: 0 cirrusdrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-6.2.0-20-generic
root=UUID=03a4e7a1-715a-4ceb-8fa6-d86a817a7092 ro vconsole.keymap=us
net.ifnames=0 biosdevname=0 crashkernel=auto selinux=0 plymouth.enable=0
console=ttyS0,115200n8 earlyprintk=ttyS0 rootdelay=300 ipv6.disable=1 audit=1
cgroup_enable=memory swapaccount=1 systemd.unified_cgroup_hierarchy=false quiet
splash vt.handoff=7
RelatedPackageVersions:
linux-restricted-modules-6.2.0-20-generic N/A
linux-backports-modules-6.2.0-20-generic N/A
linux-firmware 20230323.gitbcdcfbcf-0ubuntu1
RfKill: Error: [Errno 2] No such file or directory: 'rfkill'
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 04/01/2014
dmi.bios.release: 0.0
dmi.bios.vendor: SeaBIOS
dmi.bios.version: rel-1.10.2-0-g5f4c7b1-20181220_000000-szxrtosci10000
dmi.chassis.type: 1
dmi.chassis.vendor: QEMU
dmi.chassis.version: pc-i440fx-2.8
dmi.modalias:
dmi:bvnSeaBIOS:bvrrel-1.10.2-0-g5f4c7b1-20181220_000000-szxrtosci10000:bd04/01/2014:br0.0:svnOpenStackFoundation:pnOpenStackNova:pvr13.2.1-20220808115737_bd245dd:cvnQEMU:ct1:cvrpc-i440fx-2.8:sku:
dmi.product.family: Virtual Machine
dmi.product.name: OpenStack Nova
dmi.product.version: 13.2.1-20220808115737_bd245dd
dmi.sys.vendor: OpenStack Foundation
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