linux-kernel - Re: v5.14-rc3-rt1 losing wakeups?

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Date:   Sat, 31 Jul 2021 03:03:05 +0200
From:   Mike Galbraith <efault@....de>
To:     Thomas Gleixner <tglx@...utronix.de>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        linux-rt-users@...r.kernel.org,
        Steven Rostedt <rostedt@...dmis.org>,
        Peter Zijlstra <peterz@...radead.org>
Subject: Re: v5.14-rc3-rt1 losing wakeups?

On Fri, 2021-07-30 at 22:49 +0200, Thomas Gleixner wrote:
> >
> > First symptom is KDE/Plasma's task manager going comatose.  Notice soon
>
> KDE/Plasma points at the new fangled rtmutex based ww_mutex from
> Peter.

Yeah, that seems to be most of the delta from 50->62 [now 63] commit
delta, and the 50 turning out to be what I was already running.  I'm
staring, but as yet, nothing has poked me in the eye.

>  I tried to test the heck out of it...

And futextests, rt-tests etc work fine, just stay away from GUI.

> Which graphics driver is in use on that machine?

The all too often problem child nouveau, but I don't _think_ it's
playing a roll in this, as nomodeset hangs as well.  I'll stuff it into
lappy (i915) to double check that.

	-Mike