linux-kernel - Re: [PATCH v2] sched/core: fix illegal RCU from offline CPUs

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Message-ID: <20200402165737.GQ19865@paulmck-ThinkPad-P72>
Date:   Thu, 2 Apr 2020 09:57:37 -0700
From:   "Paul E. McKenney" <paulmck@...nel.org>
To:     Qian Cai <cai@....pw>
Cc:     Michael Ellerman <mpe@...erman.id.au>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>, juri.lelli@...hat.com,
        dietmar.eggemann@....com, vincent.guittot@...aro.org,
        rostedt@...dmis.org, bsegall@...gle.com, mgorman@...e.de,
        tglx@...utronix.de,
        "James.Bottomley@...senpartnership.com" 
        <James.Bottomley@...senpartnership.com>, deller@....de,
        linuxppc-dev@...ts.ozlabs.org, linux-parisc@...r.kernel.org,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        Nicholas Piggin <npiggin@...il.com>
Subject: Re: [PATCH v2] sched/core: fix illegal RCU from offline CPUs

On Thu, Apr 02, 2020 at 12:19:54PM -0400, Qian Cai wrote:
> 
> 
> > On Apr 2, 2020, at 11:54 AM, Paul E. McKenney <paulmck@...nel.org> wrote:
> > 
> > I do run this combination quite frequently, but only as part of
> > rcutorture, which might not be a representative workload.  For one thing,
> > it has a minimal userspace consisting only of a trivial init program.
> > I don't recall having ever seen this.  (I have seen one recent complaint
> > about an IPI being sent to an offline CPU, but I cannot prove that this
> > was not due to RCU bugs that I was chasing at the time.)
> 
> Yes, a trivial init is tough while running systemd should be able to catch it as it will use cgroup.

Not planning to add systemd to my rcutorture runs.  ;-)

							Thanx, Paul