linux-kernel - Re: [Linux 5.18-rc1] WARNING: CPU: 1 PID: 0 at kernel/sched/fair.c:3355 update_blocked

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Date:   Fri, 15 Apr 2022 21:43:13 +0700
From:   Ammar Faizi <ammarfaizi2@...weeb.org>
To:     Dietmar Eggemann <dietmar.eggemann@....com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Cc:     Ben Segall <bsegall@...gle.com>,
        Daniel Bristot de Oliveira <bristot@...hat.com>,
        GNU/Weeb Mailing List <gwml@...r.gnuweeb.org>,
        Ingo Molnar <mingo@...hat.com>,
        Juri Lelli <juri.lelli@...hat.com>,
        Mel Gorman <mgorman@...e.de>,
        Peter Zijlstra <peterz@...radead.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Vincent Guittot <vincent.guittot@...aro.org>
Subject: Re: [Linux 5.18-rc1] WARNING: CPU: 1 PID: 0 at
 kernel/sched/fair.c:3355 update_blocked_averages

On 4/14/22 4:38 PM, Dietmar Eggemann wrote:
> Looks like you saw the same issue which got fixed here:
> 
> https://lkml.kernel.org/r/20220414015940.9537-1-kuyo.chang@mediatek.com
> 
> So nothing to do with CFS BW control. It's triggered by a task with very
> low nice value and load_avg=1 during cfs_rq attach.

Yeah, it looks like I hit the same SCHED_WARN_ON() with what is explained
in that patch. As such, I assume it's fixed then. I didn't manage to
reproduce the bug, but I am moving on from this now.

Thanks for the update!

-- 
Ammar Faizi