linux-kernel - Re: [PATCH -tip V3 0/8] workqueue: break affinity initiatively

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Message-ID: <YAGS2mulIw6o+sY5@hirez.programming.kicks-ass.net>
Date:   Fri, 15 Jan 2021 14:04:26 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     "Paul E. McKenney" <paulmck@...nel.org>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Lai Jiangshan <jiangshanlai@...il.com>,
        linux-kernel@...r.kernel.org,
        Valentin Schneider <valentin.schneider@....com>,
        Qian Cai <cai@...hat.com>,
        Vincent Donnefort <vincent.donnefort@....com>,
        Dexuan Cui <decui@...rosoft.com>,
        Lai Jiangshan <laijs@...ux.alibaba.com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [PATCH -tip V3 0/8] workqueue: break affinity initiatively

On Fri, Jan 15, 2021 at 10:11:51AM +0100, Peter Zijlstra wrote:
> On Tue, Jan 12, 2021 at 03:53:24PM -0800, Paul E. McKenney wrote:
> > An SRCU-P run on the new series reproduced the warning below.  Repeat-by:
> > 
> > tools/testing/selftests/rcutorture/bin/kvm.sh --allcpus --duration 10 --configs "112*SRCU-P" --bootargs "rcupdate.rcu_cpu_stall_suppress_at_boot=1 torture.disable_onoff_at_boot rcupdate.rcu_task_stall_timeout=30000 rcutree.softirq=0" --trust-make
> 
> Lemme go wake up an EX ;-)

Whee, rescuer thread goes wobbly... took a few hours but there you have
it.

All I've got so far is fugly, gotta think harder.