Public bug reported:
Kernel workqueue WARN_ON fires repeatedly at kernel/workqueue.c:2351:
if (WARN_ON(!list_empty(&work->entry)))
goto out;
A work item is queued while already linked on a queue (double-queue). The
guard catches it and returns, so it is non-fatal, but the kernel is tainted
Tainted: [W]=WARN.
Predicate confirmed against matching source (linux-source-7.0.0 = 7.0.0-34.34,
the running kernel). It is a bare WARN_ON with no message string, confirmed by
the absence of any "workqueue: cannot queue ..." text in journalctl.
Call path:
__queue_work+0x39/0xc0
delayed_work_timer_fn+0x19/0x30
call_timer_fn+0x30/0x170
__run_timers+0x1af/0x2c0
Observed occurrences:
Sep 25 13:31:25 CPU#0 Comm: brave/53213 (task context)
Sep 28 09:13:59 CPU#1 Comm: swapper/1 (idle)
Sep 28 09:14:07 CPU#0 Comm: swapper/0 (idle)
Sep 28 09:14:18 CPU#3 Comm: swapper/3 (idle)
Sep 28 09:14:37 CPU#0 Comm: swapper/0 (idle)
Sep 28 09:14:44 CPU#0 Comm: swapper/0 (idle)
Sep 28 09:14:50 CPU#2 Comm: swapper/2 (idle)
Idle occurrences run through the timer-migration path:
run_timer_softirq -> tmigr_handle_remote -> tmigr_handle_remote_up
-> tmigr_handle_remote_cpu -> timer_expire_remote -> __run_timers
Trigger not isolated. Correlation with Brave launch is observed but unproven.
No panic, no data loss; system remains usable.
Work function involved (from ftrace workqueue_queue_work):
function=<SYMBOL FROM YOUR TRACE>
Environment:
Kernel: 7.0.0-34-generic #34-Ubuntu PREEMPT_DYNAMIC
Hardware: Dell Inc. XPS 13 9343/0TM99H, BIOS A20 06/06/2019
CPU: Intel Broadwell-U (HD 5500)
WLAN: Intel AX210
Bluetooth: Intel (hci0 hardware error 0x0c also recurring, likely separate)
Steps to reproduce:
1. Boot 7.0.0-34-generic on Dell XPS 13 9343.
2. Leave idle, or launch Brave.
3. journalctl -k shows the WARN.
Attachments:
dmesg-prevboot.txt, workqueue-trace.txt, dmidecode.txt, kernel-info.txt
ProblemType: Bug
DistroRelease: Ubuntu 26.04
Package: linux-image-7.0.0-34-generic 7.0.0-34.34
ProcVersionSignature: Ubuntu 7.0.0-34.34-generic 7.0.14
Uname: Linux 7.0.0-34-generic x86_64
ApportVersion: 2.34.1-0ubuntu0.1
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC1: louis-edmond 2223 F.... wireplumber
/dev/snd/controlC0: louis-edmond 2223 F.... wireplumber
/dev/snd/seq: louis-edmond 2117 F.... pipewire
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
Date: Mon Sep 28 11:16:08 2026
InstallationDate: Installed on 2026-03-25 (187 days ago)
InstallationMedia: Ubuntu 24.04.4 LTS "Noble Numbat" - Release amd64 (20260210)
MachineType: Dell Inc. XPS 13 9343
ProcEnviron:
LANG=en_US.UTF-8
PATH=(custom, no user)
SHELL=/usr/bin/zsh
TERM=xterm-256color
XDG_RUNTIME_DIR=<set>
ProcFB: 0 i915drmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-7.0.0-34-generic
root=UUID=1c7a9e76-71b6-4110-b0c1-33be50496ab5 ro quiet splash
crashkernel=2G-4G:320M,4G-32G:512M,32G-64G:1024M,64G-128G:2048M,128G-:4096M
PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No
PulseAudio daemon running, or not running as session daemon.
SourcePackage: linux
UpgradeStatus: Upgraded to resolute on 2026-07-16 (74 days ago)
dmi.bios.date: 06/06/2019
dmi.bios.release: 65.20
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A20
dmi.board.name: 0TM99H
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.type: 9
dmi.chassis.vendor: Dell Inc.
dmi.modalias:
dmi:bvnDellInc.:bvrA20:bd06/06/2019:br65.20:svnDellInc.:pnXPS139343:pvr:rvnDellInc.:rn0TM99H:rvrA00:cvnDellInc.:ct9:cvr:sku0665:pfa:
dmi.product.name: XPS 13 9343
dmi.product.sku: 0665
dmi.sys.vendor: Dell Inc.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug resolute wayland-session
** Attachment added: "sudo journalctl k b 1.txt"
https://bugs.launchpad.net/bugs/2168791/+attachment/6003495/+files/sudo%20journalctl%20k%20b%201.txt
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https://bugs.launchpad.net/bugs/2168791
Title:
workqueue WARN_ON(!list_empty(&work->entry)) at workqueue.c:2351 from
delayed_work_timer_fn on Dell XPS 13 9343
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