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From: Thomas Gleixner <tglx@linutronix.de>
To: Mike Galbraith <efault@gmx.de>,
	Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: LKML <linux-kernel@vger.kernel.org>,
	linux-rt-users@vger.kernel.org,
	Steven Rostedt <rostedt@goodmis.org>,
	Peter Zijlstra <peterz@infradead.org>
Subject: Re: v5.14-rc3-rt1 losing wakeups?
Date: Fri, 30 Jul 2021 22:49:22 +0200	[thread overview]
Message-ID: <87pmuzsf1p.ffs@tglx> (raw)
In-Reply-To: <2ae27233ab091d09a7d1e971a47144b40dd51fa0.camel@gmx.de>

Mike,

On Fri, Jul 30 2021 at 17:21, Mike Galbraith wrote:
> On Fri, 2021-07-30 at 13:07 +0200, Sebastian Andrzej Siewior wrote:
>> Dear RT folks!
>>
>> I'm pleased to announce the v5.14-rc3-rt1 patch set.
>
> Damn, I was hoping to figure out wth is going on before the 62 patch
> version of tglx/rtmutex branch made its way out into the big wide
> world, but alas, I was too slow.
>
> I started meeting GUI hangs as soon as I merged the 62 patch series
> into my 5.13-rt based master tree.  I took tglx/rtmutex (977db8e523f5)
> back to 5.13-rt to make sure it wasn't some booboo I had made in the
> rolled forward tree, but the hangs followed the backport, and I just
> met them in virgin v5.14-rc3-rt1, so unfortunately it wasn't some local
> booboo, there's a bug lurking.  Maybe a config sensitive one, as what
> I'm seeing on my box seems unlikely to escape into the wild otherwise.
>
> 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. I tried to test the heck out of it...

Which graphics driver is in use on that machine?

> been helpful anyway, box at a glance looks fine.  With lockdep enabled,
> a failing kernel gets so buggered it isn't even able to crashdump.

Ouch.

Thanks,

        tglx

  reply	other threads:[~2021-07-30 20:49 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-30 11:07 [ANNOUNCE] v5.14-rc3-rt1 Sebastian Andrzej Siewior
2021-07-30 15:21 ` v5.14-rc3-rt1 losing wakeups? Mike Galbraith
2021-07-30 20:49   ` Thomas Gleixner [this message]
2021-07-31  1:03     ` Mike Galbraith
2021-07-31  3:33       ` Mike Galbraith
2021-07-31  8:50         ` Mike Galbraith
2021-08-01  3:36     ` Mike Galbraith
2021-08-01 15:14       ` Mike Galbraith
2021-08-02  7:02         ` Sebastian Andrzej Siewior
2021-08-02  7:18           ` Mike Galbraith
2021-08-02  8:25             ` Sebastian Andrzej Siewior
2021-08-02  8:40               ` Mike Galbraith
2021-08-02  9:12         ` Thomas Gleixner

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