linux-kernel - Re: [PATCH] sched/deadline: Fix BUG

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Date:   Mon, 18 Jul 2022 15:01:22 +0200
From:   Juri Lelli <juri.lelli@...hat.com>
To:     Ankit Jain <ankitja@...are.com>
Cc:     "srivatsa@...il.mit.edu" <srivatsa@...il.mit.edu>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-rt-users <linux-rt-users@...r.kernel.org>,
        Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ben Segall <bsegall@...gle.com>, Mel Gorman <mgorman@...e.de>,
        Daniel Bristot de Oliveira <bristot@...hat.com>,
        Valentin Schneider <vschneid@...hat.com>,
        Sharan Turlapati <sturlapati@...are.com>,
        Him Kalyan Bordoloi <bordoloih@...are.com>,
        Keerthana Kalyanasundaram <keerthanak@...are.com>,
        Anish Swaminathan <anishs@...are.com>,
        Srivatsa Bhat <srivatsab@...are.com>
Subject: Re: [PATCH] sched/deadline: Fix BUG_ON condition for deboosted tasks

On 18/07/22 07:46, Ankit Jain wrote:

...

> Hi Juri,
> 
> Actually, while testing I already included below commits in 4.19-rt :
> 
> feff2e65efd8d84cf831668e182b2ce73c604bbb (sched/deadline: Unthrottle PI boosted threads while
>  enqueuing)
> 46fcc4b00c3cca8adb9b7c9afdd499f64e427135 (sched/deadline: Fix stale throttling on de-/boosted tasks)
> 2279f540ea7d05f22d2f0c4224319330228586bc (sched/deadline: Fix priority inheritance with multiple)
> 0e3872499de1a1230cef5221607d71aa09264bd5 (kernel/sched: Remove dl_boosted flag comment)

Interesting.

Is the workload you are using to test this easily reproducible? I'd like
to try that out on my end to check if I see the same (of course the
issue I was working on goes away with my fix :).

Best,
Juri