linux-kernel - Re: INFO: rcu detected stall in do

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Message-ID: <20181031173947.GE13219@hirez.programming.kicks-ass.net>
Date:   Wed, 31 Oct 2018 18:39:47 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Juri Lelli <juri.lelli@...hat.com>
Cc:     Daniel Bristot de Oliveira <bristot@...hat.com>,
        luca abeni <luca.abeni@...tannapisa.it>,
        Thomas Gleixner <tglx@...utronix.de>,
        Juri Lelli <juri.lelli@...il.com>,
        syzbot <syzbot+385468161961cee80c31@...kaller.appspotmail.com>,
        Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        LKML <linux-kernel@...r.kernel.org>, mingo@...hat.com,
        nstange@...e.de, syzkaller-bugs@...glegroups.com, henrik@...tad.us,
        Tommaso Cucinotta <tommaso.cucinotta@...tannapisa.it>,
        Claudio Scordino <claudio@...dence.eu.com>
Subject: Re: INFO: rcu detected stall in do_idle

On Wed, Oct 31, 2018 at 05:40:10PM +0100, Juri Lelli wrote:
> I'm seeing something along the lines of what Peter suggested as a last
> resort measure we probably still need to put in place.

Yes, you certainly hope to never hit that, and should not in a proper
setup. But we need something to keep things 'working'.