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From:   Kurt Kanzenbach <kurt.kanzenbach@linutronix.de>
To:     Vladimir Oltean <olteanv@gmail.com>,
        linux-rt-users@vger.kernel.org,
        lkml <linux-kernel@vger.kernel.org>, rcu@vger.kernel.org
Cc:     Colin King <colin.king@canonical.com>
Subject: Re: stress-ng --hrtimers hangs system
In-Reply-To: <4781d250-9a29-cef3-268d-7d83c98bf16a@gmail.com>
References: <4781d250-9a29-cef3-268d-7d83c98bf16a@gmail.com>
Date:   Fri, 05 Jun 2020 14:57:06 +0200
Message-ID: <87wo4lekm5.fsf@kurt>
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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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