linux-kernel - Re: [ANNOUNCE] v5.9.1-rt19

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Date:   Tue, 27 Oct 2020 11:28:51 +0100
From:   Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:     Daniel Wagner <wagi@...om.org>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-rt-users <linux-rt-users@...r.kernel.org>,
        Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [ANNOUNCE] v5.9.1-rt19

On 2020-10-27 11:25:47 [+0100], Daniel Wagner wrote:
> Well, one thing I need to figure out is how to get pi_stress working
> correctly on my machines (that is for all -rt trees, so it's nothing
> new). It consistently triggers RCU stall warnings with hackbench as
> workload. Clark told me the test only works if there are enough CPUs to
> run on. Need to look into it.

Is it running as a RT task? Do you have RCU-boosting enabled?
Otherwise it looks that if you throw enough non-RT load on the system,
RCU can not catch up which does not sound good.

Sebastian