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

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Message-ID: <6fce881efc3d8c24a5172528fe1f46ec2ddc0607.camel@gmx.de>
Date:   Sun, 01 Aug 2021 05:36:57 +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.

Seems not.  When booting KVM box with nomodeset, there's exactly one
early boot ww_mutex lock/unlock, ancient history at the failure point.

	-Mike