linux-kernel - Re: lockdep splat in v5.11-rc1 involving console

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Message-ID: <20210111151120.GD2743@paulmck-ThinkPad-P72>
Date:   Mon, 11 Jan 2021 07:11:20 -0800
From:   "Paul E. McKenney" <paulmck@...nel.org>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     tglx@...utronix.de, linux-kernel@...r.kernel.org,
        valentin.schneider@....com, bristot@...hat.com, frederic@...nel.org
Subject: Re: lockdep splat in v5.11-rc1 involving console_sem and rq locks

On Mon, Jan 11, 2021 at 03:42:28PM +0100, Peter Zijlstra wrote:
> On Tue, Jan 05, 2021 at 02:01:15PM -0800, Paul E. McKenney wrote:
> > Hello!
> > 
> > The RUDE01 rcutorture scenario (and less often, the TASKS01 scenario)
> 
> Is:
> 
>   tools/testing/selftests/rcutorture/bin/kvm.sh --duration 10 --configs RUDE01 --allcpus
> 
> the right incantation?

I responded on IRC, but may as well make it official:

tools/testing/selftests/rcutorture/bin/kvm.sh --allcpus --duration 10 --configs '32*RUDE01' --trust-make

This assumes a 64-CPU box, hence for this two-CPU scenario "32*".  This
will run 32 concurrent instances of RUDE01, thus reproducing more quickly.

The "--trust-make" is important in your case to avoid clobbering your
tags files.

							Thanx, Paul