linux-kernel - Re: Boot regression: arm64: WARNING: kernel/sched/core.c:10851 at sched_change

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Message-ID: <20251216122127.GC3707891@noisy.programming.kicks-ass.net>
Date: Tue, 16 Dec 2025 13:21:27 +0100
From: Peter Zijlstra <peterz@...radead.org>
To: Naresh Kamboju <naresh.kamboju@...aro.org>
Cc: sched-ext@...ts.linux.dev, open list <linux-kernel@...r.kernel.org>,
	lkft-triage@...ts.linaro.org, Ingo Molnar <mingo@...nel.org>,
	Vincent Guittot <vincent.guittot@...aro.org>,
	Juri Lelli <juri.lelli@...hat.com>,
	Dietmar Eggemann <dietmar.eggemann@....com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Ben Segall <bsegall@...gle.com>, Mel Gorman <mgorman@...e.de>,
	Valentin Schneider <vschneid@...hat.com>, Tejun Heo <tj@...nel.org>,
	void@...ifault.com, arighi@...dia.com, changwoo@...lia.com
Subject: Re: Boot regression: arm64: WARNING: kernel/sched/core.c:10851 at
 sched_change_end

On Tue, Dec 16, 2025 at 05:09:52PM +0530, Naresh Kamboju wrote:
> The following boot warning is noticed on qemu-arm64 devices booting
> Linux next-20251215 on wards.
> 
> Regression Analysis:
> - New regression? yes
> - Reproducibility? yes
> 
> First seen on next-20251215
> Bad:  next-20251215 and next-20251216
> Good: next-20251212
> 
> Boot regression: arm64: WARNING: kernel/sched/core.c:10851 at sched_change_end
> 
> Reported-by: Linux Kernel Functional Testing <lkft@...aro.org>

This is absolutely unreadable due to all the wrapping.