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Date:   Sun, 27 Dec 2020 08:02:20 -0800
From:   "Paul E. McKenney" <paulmck@kernel.org>
To:     Lai Jiangshan <jiangshanlai@gmail.com>
Cc:     Hillf Danton <hdanton@sina.com>,
        LKML <linux-kernel@vger.kernel.org>,
        Valentin Schneider <valentin.schneider@arm.com>,
        Peter Zijlstra <peterz@infradead.org>,
        Qian Cai <cai@redhat.com>,
        Vincent Donnefort <vincent.donnefort@arm.com>,
        Lai Jiangshan <laijs@linux.alibaba.com>,
        Tejun Heo <tj@kernel.org>
Subject: Re: [PATCH -tip V2 00/10] workqueue: break affinity initiatively
Message-ID: <20201227160220.GK2657@paulmck-ThinkPad-P72>
Reply-To: paulmck@kernel.org
References: <20201218170919.2950-1-jiangshanlai@gmail.com>
 <20201226103421.6616-1-hdanton@sina.com>
 <20201226145239.GJ2657@paulmck-ThinkPad-P72>
 <CAJhGHyBGb_fBqp7-XCD0bkZOt5E_aPKwkViY3PUN1MVZuBE3KA@mail.gmail.com>
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On Sun, Dec 27, 2020 at 10:08:51PM +0800, Lai Jiangshan wrote:
> On Sat, Dec 26, 2020 at 10:52 PM Paul E. McKenney <paulmck@kernel.org> wrote:
> 
> > >
> > > Can you please specify a bit what you encountered in rcutorture
> > > before this patchset? You know we cant have a correct estimation
> > > of the fix diameter without your help.
> 
> >
> > It triggers the following in sched_cpu_dying() in kernel/sched/core.c,
> > exactly the same as for Lai Jiangshan:
> >
> >         BUG_ON(rq->nr_running != 1 || rq_has_pinned_tasks(rq))
> >
> > Which is in fact the "this" in my earlier "rcutorture hits this".  ;-)
> >
> >                                                         Thanx, Paul
> >
> 
> Hi, Hillf
> 
> https://lkml.org/lkml/2020/12/22/141
> 
> >From the email, I think rcutorture encountered the same problem.
> 
> Hi, Paul
> 
> I'm sorry to forget to add your Tested-by.

No need to apologize, especially given that I didn't get around to
testing it until after it was pulled into -tip.  ;-)

Thank you for the patch series!

							Thanx, Paul