linux-kernel - Re: [Bug] Race condition between CPU hotplug off flow and __sched

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Message-ID: <20220519131926.GB6479@worktop.programming.kicks-ass.net>
Date:   Thu, 19 May 2022 15:19:26 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Jing-Ting Wu <jing-ting.wu@...iatek.com>
Cc:     Daniel Bristot de Oliveira <bristot@...hat.com>,
        Valentin Schneider <vschneid@...hat.com>, tglx@...utronix.de,
        wsd_upstream@...iatek.com, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, Jonathan.JMChen@...iatek.com,
        "chris.redpath@....com" <chris.redpath@....com>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Vincent Donnefort <vdonnefort@...il.com>,
        Ingo Molnar <mingo@...hat.com>,
        Juri Lelli <juri.lelli@...hat.com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ben Segall <bsegall@...gle.com>, Mel Gorman <mgorman@...e.de>,
        Christian Brauner <brauner@...nel.org>
Subject: Re: [Bug] Race condition between CPU hotplug off flow and
 __sched_setscheduler()

On Thu, May 19, 2022 at 03:14:52PM +0200, Peter Zijlstra wrote:
> On Thu, May 19, 2022 at 08:53:15PM +0800, Jing-Ting Wu wrote:
> > Hi all
> > 
> > 
> > There is a race condition between CPU hotplug off flow and
> > __sched_setscheduler(), which will cause hang-up in CPU hotplug off
> > flow.
> 
> Oooh, you're using core scheduling and the A/B are SMT siblings?

Hmm, no.. lemme try again.