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Date:   Sun, 27 Dec 2020 22:08:51 +0800
From:   Lai Jiangshan <>
To:     "Paul E. McKenney" <>
Cc:     Hillf Danton <>,
        LKML <>,
        Valentin Schneider <>,
        Peter Zijlstra <>,
        Qian Cai <>,
        Vincent Donnefort <>,
        Lai Jiangshan <>,
        Tejun Heo <>
Subject: Re: [PATCH -tip V2 00/10] workqueue: break affinity initiatively

On Sat, Dec 26, 2020 at 10:52 PM Paul E. McKenney <> 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

>From the email, I think rcutorture encountered the same problem.

Hi, Paul

I'm sorry to forget to add your Tested-by.


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