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From:   Lai Jiangshan <jiangshanlai@gmail.com>
Date:   Sat, 16 Jan 2021 14:00:33 +0800
Message-ID: <CAJhGHyAC59=iohLdDFD56UGTeqEz8-U880emOMDS2UWMr+rJ6g@mail.gmail.com>
Subject: Re: [PATCH -tip V3 0/8] workqueue: break affinity initiatively
To:     Peter Zijlstra <peterz@infradead.org>
Cc:     "Paul E. McKenney" <paulmck@kernel.org>,
        Thomas Gleixner <tglx@linutronix.de>,
        LKML <linux-kernel@vger.kernel.org>,
        Valentin Schneider <valentin.schneider@arm.com>,
        Qian Cai <cai@redhat.com>,
        Vincent Donnefort <vincent.donnefort@arm.com>,
        Dexuan Cui <decui@microsoft.com>,
        Lai Jiangshan <laijs@linux.alibaba.com>,
        Vincent Guittot <vincent.guittot@linaro.org>,
        Steven Rostedt <rostedt@goodmis.org>
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On Fri, Jan 15, 2021 at 9:05 PM Peter Zijlstra <peterz@infradead.org> wrote:
>
> 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.

Hello,

With the help of this patch, you can solve the problem.

https://lore.kernel.org/lkml/20210116065753.2163-1-jiangshanlai@gmail.com/