linux-kernel - Re: stress-ng --hrtimers hangs system

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Message-ID: <87wo4lekm5.fsf@kurt>
Date:   Fri, 05 Jun 2020 14:57:06 +0200
From:   Kurt Kanzenbach <kurt.kanzenbach@...utronix.de>
To:     Vladimir Oltean <olteanv@...il.com>,
        linux-rt-users@...r.kernel.org,
        lkml <linux-kernel@...r.kernel.org>, rcu@...r.kernel.org
Cc:     Colin King <colin.king@...onical.com>
Subject: Re: stress-ng --hrtimers hangs system

Hi Vladimir,

On Fri Jun 05 2020, Vladimir Oltean wrote:
> Hi,
>
> I was testing stress-ng on an ARM64 box and I found that it can be killed instantaneously with a --hrtimers 1 test:
> https://github.com/ColinIanKing/stress-ng/blob/master/stress-hrtimers.c
> The console shell locks up immediately after starting the process, and I get this rcu_preempt splat after 21 seconds,
> letting me know that the grace-periods kernel thread could not run:

interesting. Just tested this on an ARM64 box with v5.6-rt and the
stress-ng hrtimer test works fine. No lockups, cyclictest results are
looking good. So maybe this is v5.7 related.

Thanks,
Kurt

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