Public bug reported:
Description:
On October 18, 2026, at approximately 17:18 CEST, my Ubuntu 24.04 LTS
desktop became completely unresponsive and required a hardware reset.
After rebooting, systemd-pstore recovered an EFI PStore dump containing
a kernel panic from the preceding boot.
Affected kernel:
6.8.0-147-generic #147-Ubuntu
Hardware:
AMD Ryzen 5 2400G with integrated Radeon Vega graphics
MSI B450I GAMING PLUS AC (MS-7A40)
BIOS A.72 (2019-05-20)
Crash signature:
invalid opcode: 0000 [#1] PREEMPT SMP NOPTI
CPU: 1 PID: 0 Comm: swapper/1 Not tainted 6.8.0-147-generic #147-Ubuntu
RIP: 0010:update_blocked_averages+0x111/0x300
Call Trace:
_nohz_idle_balance.isra.0
run_rebalance_domains
handle_softirqs
__irq_exit_rcu
irq_exit_rcu
sysvec_call_function_single
Kernel panic - not syncing: Fatal exception in interrupt
The crash occurred after approximately 16,906 seconds of kernel uptime,
consistent with the observed time of the system freeze.
Additional observation:
The instruction bytes shown in the initial exception report differ from
those printed again during the panic:
41 03 fd <3f> 0f 87
41 83 fd <3f> 0f 87
This discrepancy may warrant investigation for possible code or memory
corruption. The underlying cause has not been established.
The crash occurred in the scheduler's idle load-balancing path. Although
the amdgpu module was loaded, it does not appear in the failing call
trace.
Reproduction: Not currently reproducible on demand.
Expected result: The system should remain operational.
Actual result: Fatal kernel exception and complete system freeze
requiring a hardware reset.
The complete EFI PStore dump is available as an attachment.
ProblemType: Bug
DistroRelease: Ubuntu 24.04
Package: linux-image-6.8.0-147-generic 6.8.0-147.147
ProcVersionSignature: Ubuntu 6.8.0-147.147-generic 6.8.12
Uname: Linux 6.8.0-147-generic x86_64
ApportVersion: 2.28.3-0ubuntu0.1
Architecture: amd64
CRDA: N/A
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
Date: Sun Oct 18 17:57:58 2026
InstallationDate: Installed on 2025-07-13 (462 days ago)
InstallationMedia: Ubuntu 22.04.4 LTS "Jammy Jellyfish" - Release amd64
(20240220)
MachineType: Micro-Star International Co., Ltd. MS-7A40
ProcEnviron:
LANG=de_DE.UTF-8
PATH=(custom, no user)
SHELL=/bin/bash
TERM=xterm-256color
XDG_RUNTIME_DIR=<set>
ProcFB: 0 amdgpudrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-6.8.0-147-generic
root=UUID=d068eac6-c411-4f4f-8553-f85206207b0e ro quiet splash reboot=pci
vt.handoff=7
PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No
PulseAudio daemon running, or not running as session daemon.
RelatedPackageVersions:
linux-restricted-modules-6.8.0-147-generic N/A
linux-backports-modules-6.8.0-147-generic N/A
linux-firmware 20240318.git3b128b60.0ubuntu3.1
SourcePackage: linux
UpgradeStatus: Upgraded to noble on 2025-07-13 (462 days ago)
dmi.bios.date: 05/20/2019
dmi.bios.release: 5.14
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: A.72
dmi.board.asset.tag: To be filled by O.E.M.
dmi.board.name: B450I GAMING PLUS AC (MS-7A40)
dmi.board.vendor: Micro-Star International Co., Ltd.
dmi.board.version: 2.0
dmi.chassis.asset.tag: To be filled by O.E.M.
dmi.chassis.type: 3
dmi.chassis.vendor: Micro-Star International Co., Ltd.
dmi.chassis.version: 2.0
dmi.modalias:
dmi:bvnAmericanMegatrendsInc.:bvrA.72:bd05/20/2019:br5.14:svnMicro-StarInternationalCo.,Ltd.:pnMS-7A40:pvr2.0:rvnMicro-StarInternationalCo.,Ltd.:rnB450IGAMINGPLUSAC(MS-7A40):rvr2.0:cvnMicro-StarInternationalCo.,Ltd.:ct3:cvr2.0:skuTobefilledbyO.E.M.:
dmi.product.family: To be filled by O.E.M.
dmi.product.name: MS-7A40
dmi.product.sku: To be filled by O.E.M.
dmi.product.version: 2.0
dmi.sys.vendor: Micro-Star International Co., Ltd.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug noble wayland-session
** Attachment added: "dmesg.txt"
https://bugs.launchpad.net/bugs/2171338/+attachment/6010347/+files/dmesg.txt
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https://bugs.launchpad.net/bugs/2171338
Title:
Kernel panic in update_blocked_averages() on Ubuntu 24.04, linux
6.8.0-147-generic
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