linux-kernel - Re: SCHED_DEADLINE tasks causing WARNING at kernel/sched/sched.h message

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Message-ID: <aLlabksolt1imHXe@jlelli-thinkpadt14gen4.remote.csb>
Date: Thu, 4 Sep 2025 11:22:54 +0200
From: Juri Lelli <juri.lelli@...hat.com>
To: Marcel Ziswiler <marcel.ziswiler@...ethink.co.uk>
Cc: linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Vineeth Pillai <vineeth@...byteword.org>,
	Luca Abeni <luca.abeni@...tannapisa.it>
Subject: Re: SCHED_DEADLINE tasks causing WARNING at kernel/sched/sched.h
 message

Hi Marcel,

On 02/09/25 18:49, Marcel Ziswiler wrote:
> Hi
> 
> On Tue, 2025-09-02 at 16:06 +0200, Marcel Ziswiler wrote:
> > As part of our trustable work [1], we also run a lot of real time scheduler (SCHED_DEADLINE) tests on the
> > mainline Linux kernel (v6.16.2 in below reported case).
> 
> Looking through more logs from earlier test runs I found similar WARN_ONs dating back as early as v6.15.3. So
> it does not look like a "new" issue in that sense.
> 
> [snip]
> 
> Any help is much appreciated. Thanks!

What's the actual workload composition leading the warning. I noticed
stress-ng in the report. Could you please share more details?

Thanks!
Juri