I see kernel BUG at fs/cachefiles/rdwr.c:717 in dmesg.
This is probably the same bug described here by wrong assertions:
https://bugzilla.kernel.org/show_bug.cgi?id=208883
ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: linux-image-5.8.0-34-generic 5.8.0-34.37~20.04.2
ProcVersionSignature: Ubuntu 5.8.0-34.37~20.04.2-generic 5.8.18
Uname: Linux 5.8.0-34-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.14
Architecture: amd64
CasperMD5CheckResult: skip
Date: Fri Jan 8 11:02:24 2021
InstallationDate: Installed on 2020-04-24 (259 days ago)
InstallationMedia: Ubuntu-Server 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
ProcEnviron:
TERM=screen
PATH=(custom, no user)
LANG=de_DE.UTF-8
SHELL=/bin/bash
SourcePackage: linux-signed-hwe-5.8
UpgradeStatus: No upgrade log present (probably fresh install)
---
ProblemType: Bug
AlsaDevices:
total 0
crw-rw---- 1 root audio 116, 1 Jan 8 10:33 seq
crw-rw---- 1 root audio 116, 33 Jan 8 10:33 timer
AplayDevices: Error: [Errno 2] No such file or directory: 'aplay'
ApportVersion: 2.20.11-0ubuntu27.14
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:
CasperMD5CheckResult: skip
DistroRelease: Ubuntu 20.04
HibernationDevice: RESUME=UUID=73324545-92dc-44d1-aa3b-85090a8a467a
InstallationDate: Installed on 2020-04-24 (259 days ago)
InstallationMedia: Ubuntu-Server 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig'
Lsusb: Error: command ['lsusb'] failed with exit code 1:
Lsusb-t:
Lsusb-v: Error: command ['lsusb', '-v'] failed with exit code 1:
MachineType: VMware, Inc. VMware Virtual Platform
Package: linux (not installed)
PciMultimedia:
ProcEnviron:
TERM=screen
PATH=(custom, no user)
LANG=de_DE.UTF-8
SHELL=/bin/bash
ProcFB: 0 svgadrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.8.0-34-generic root=/dev/mapper/vg_0-lv_root ro
ProcVersionSignature: Ubuntu 5.8.0-34.37~20.04.2-generic 5.8.18
RelatedPackageVersions:
linux-restricted-modules-5.8.0-34-generic N/A
linux-backports-modules-5.8.0-34-generic N/A
linux-firmware 1.187.7
RfKill: Error: [Errno 2] No such file or directory: 'rfkill'
Tags: focal
Uname: Linux 5.8.0-34-generic x86_64
UnreportableReason: This report is about a package that is not installed.
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: N/A
_MarkForUpload: False
dmi.bios.date: 12/12/2018
dmi.bios.release: 4.6
dmi.bios.vendor: Phoenix Technologies LTD
dmi.bios.version: 6.00
dmi.board.name: 440BX Desktop Reference Platform
dmi.board.vendor: Intel Corporation
dmi.board.version: None
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 1
dmi.chassis.vendor: No Enclosure
dmi.chassis.version: N/A
dmi.ec.firmware.release: 0.0
dmi.modalias: dmi:bvnPhoenixTechnologiesLTD:bvr6.00:bd12/12/2018:br4.6:efr0.0:svnVMware,Inc.:pnVMwareVirtualPlatform:pvrNone:rvnIntelCorporation:rn440BXDesktopReferencePlatform:rvrNone:cvnNoEnclosure:ct1:cvrN/A:
dmi.product.name: VMware Virtual Platform
dmi.product.version: None
dmi.sys.vendor: VMware, Inc.
apport information