Kernel Call Trace on Secure Boot

[js1]

Could the call traces in dmesg be related to UEFI secure boot?

ProblemType: Bug
DistroRelease: Ubuntu 21.04
Package: linux-image-5.11.0-34-generic 5.11.0-34.36
ProcVersionSignature: Ubuntu 5.11.0-34.36-generic 5.11.22
Uname: Linux 5.11.0-34-generic x86_64
ApportVersion: 2.20.11-0ubuntu65.1
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: js1 948 F.... pulseaudio
CasperMD5CheckResult: pass
CurrentDesktop: KDE
Date: Tue Sep 7 21:05:54 2021
InstallationDate: Installed on 2021-09-06 (1 days ago)
InstallationMedia: Kubuntu 21.04 "Hirsute Hippo" - Release amd64 (20210420)
Lsusb:
 Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
 Bus 001 Device 002: ID 0bda:b00b Realtek Semiconductor Corp. Realtek Bluetooth 4.2 Adapter
 Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Lsusb-t:
 /: Bus 02.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/7p, 5000M
 /: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/9p, 480M
     |__ Port 8: Dev 2, If 0, Class=Wireless, Driver=btusb, 12M
     |__ Port 8: Dev 2, If 1, Class=Wireless, Driver=btusb, 12M
ProcFB: 0 i915drmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-5.11.0-34-generic root=/dev/mapper/vgkubuntu-root ro ipv6.disable=1 elevator=deadline splash vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-5.11.0-34-generic N/A
 linux-backports-modules-5.11.0-34-generic N/A
 linux-firmware 1.197.3
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 03/25/2021
dmi.bios.release: 15.63
dmi.bios.vendor: Insyde
dmi.bios.version: F.63
dmi.board.name: 84B6
dmi.board.vendor: HP
dmi.board.version: KBC Version 76.32
dmi.chassis.type: 10
dmi.chassis.vendor: HP
dmi.chassis.version: Chassis Version
dmi.ec.firmware.release: 76.32
dmi.modalias: dmi:bvnInsyde:bvrF.63:bd03/25/2021:br15.63:efr76.32:svnHP:pn:pvr:sku:rvnHP:rn84B6:rvrKBCVersion76.32:cvnHP:ct10:cvrChassisVersion:
dmi.sys.vendor: HP

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

This change was made by a bot.

[js1 (sujiannming)]

I disabled Secure Boot and same problem. Seems to happen reliably on cold boots.

[Kai-Heng Feng (kaihengfeng)]

Please test latest mainline kernel:
https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.14/amd64/
Headers are not needed.

[Alex Hung (alexhung)]

The slow CPU (N5000 CPU @ 1.10GHz) may play a role in the watchdog soft lockup. You can increase the watchdog time and check whether the messages will go away and pop up less frequently:

  $ echo 20 | sudo tee /proc/sys/kernel/watchdog_thresh

The above command will change the default (10) to 20

[js1 (sujiannming)]

I downgraded to 20.04 LTS and 5.8 kernel. So far, it seems more reliable than the 5.11 kernel. The watchdog_thresh is default 10.

[Launchpad Janitor (janitor)]

[Expired for linux (Ubuntu) because there has been no activity for 60 days.]