linux-kernel - [PATCH 0/2] workqueue: Introduce panic_on_stall

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-Id: <20260206-wqstall_panic_time-v1-0-f2a21d5d87a4@debian.org>
Date: Fri, 06 Feb 2026 03:18:00 -0800
From: Breno Leitao <leitao@...ian.org>
To: Tejun Heo <tj@...nel.org>, Lai Jiangshan <jiangshanlai@...il.com>
Cc: linux-kernel@...r.kernel.org, osandov@...ndov.com, rneu@...a.com, 
 Breno Leitao <leitao@...ian.org>, kernel-team@...a.com
Subject: [PATCH 0/2] workqueue: Introduce panic_on_stall_time module
 parameter

This series adds a new module parameter 'panic_on_stall_time' that allows the
system to panic if a workqueue stall lasts longer than the specified number of
seconds.

Unlike the existing 'panic_on_stall' parameter which counts total stall
events over the kernel's lifetime, this new parameter triggers a panic
based on the actual duration of a continuous stall. This is useful for
catching truly stuck workqueues rather than accumulating transient stalls.

Usage:
workqueue.panic_on_stall_time=120

This would panic if any workqueue pool has been stalled for 120 seconds
or more.

This approach differs from simply setting watchdog_thresh=120 and
panic_on_stall=1, as the user still wants to observe stalls but only
trigger a crash for stalls that are exceptionally long and remain
unresolved.

Signed-off-by: Breno Leitao <leitao@...ian.org>
---
Breno Leitao (2):
      workqueue: add time-based panic for stalls
      workqueue: replace BUG_ON with panic in panic_on_wq_watchdog

 Documentation/admin-guide/kernel-parameters.txt |  8 +++++++
 kernel/workqueue.c                              | 28 ++++++++++++++++++++-----
 2 files changed, 31 insertions(+), 5 deletions(-)
---
base-commit: 6bd9ed02871f22beb0e50690b0c3caf457104f7c
change-id: 20260205-wqstall_panic_time-fbfe60f33c85

Best regards,
--  
Breno Leitao <leitao@...ian.org>