linux-kernel - Re: [PATCH 04/19] sched: Prepare for Core-wide rq->lock

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Date:   Thu, 29 Apr 2021 13:48:01 -0700
From:   Josh Don <joshdon@...gle.com>
To:     Don Hiatt <dhiatt@...italocean.com>
Cc:     Aubrey Li <aubrey.intel@...il.com>,
        Aubrey Li <aubrey.li@...ux.intel.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Joel Fernandes <joel@...lfernandes.org>,
        "Hyser,Chris" <chris.hyser@...cle.com>,
        Ingo Molnar <mingo@...nel.org>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Valentin Schneider <valentin.schneider@....com>,
        Mel Gorman <mgorman@...e.de>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH 04/19] sched: Prepare for Core-wide rq->lock

On Wed, Apr 28, 2021 at 9:41 AM Don Hiatt <dhiatt@...italocean.com> wrote:
>
> I'm still seeing hard lockups while repeatedly setting cookies on qemu
> processes even with
> the updated patch. If there is any debug you'd like me to turn on,
> just let me know.
>
> Thanks!
>
> don

Thanks for the added context on your repro configuration. In addition
to the updated patch from earlier, could you try the modification to
double_rq_lock() from
https://lkml.kernel.org/r/CABk29NuS-B3n4sbmavo0NDA1OCCsz6Zf2VDjjFQvAxBMQoJ_Lg@mail.gmail.com
? I have a feeling this is what's causing your lockup.

Best,
Josh