linux-kernel - Re: [PATCH RT v2] Fix a lockup in wait_for

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Date:   Tue, 2 Jul 2019 09:04:18 +0200
From:   Kurt Kanzenbach <kurt.kanzenbach@...utronix.de>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     Corey Minyard <cminyard@...sta.com>,
        Corey Minyard <minyard@....org>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        linux-rt-users@...r.kernel.org, linux-kernel@...r.kernel.org,
        Peter Zijlstra <peterz@...radead.org>, tglx@...utronix.de
Subject: Re: [PATCH RT v2] Fix a lockup in wait_for_completion() and friends

Hi,

On Mon, Jul 01, 2019 at 05:28:25PM -0400, Steven Rostedt wrote:
> On Mon, 1 Jul 2019 17:13:33 -0400
> Steven Rostedt <rostedt@...dmis.org> wrote:
>
> > On Mon, 1 Jul 2019 17:06:02 -0400
> > Steven Rostedt <rostedt@...dmis.org> wrote:
> >
> > > On Mon, 1 Jul 2019 15:43:25 -0500
> > > Corey Minyard <cminyard@...sta.com> wrote:
> > >
> > >
> > > > I show that patch is already applied at
> > > >
> > > >     1921ea799b7dc561c97185538100271d88ee47db
> > > >     sched/completion: Fix a lockup in wait_for_completion()
> > > >
> > > > git describe --contains 1921ea799b7dc561c97185538100271d88ee47db
> > > > v4.19.37-rt20~1
> > > >
> > > > So I'm not sure what is going on.
> > >
> > > Bah, I'm replying to the wrong commit that I'm having issues with.
> > >
> > > I searched your name to find the patch that is of trouble, and picked
> > > this one.
> > >
> > > I'll go find the problem patch, sorry for the noise on this one.
> > >
> >
> > No, I did reply to the right email, but it wasn't the top patch I was
> > having issues with. It was the patch I replied to:
> >
> > This change below that Sebastian marked as stable-rt is what is causing
> > me an issue. Not the patch that started the thread.
> >
>
> In fact, my system doesn't boot with this commit in 5.0-rt.
>
> If I revert 90e1b18eba2ae4a729 ("swait: Delete the task from after a
> wakeup occured") the machine boots again.
>
> Sebastian, I think that's a bad commit, please revert it.

I'm having the same problem on a Cyclone V based ARM board. Reverting
this commit solves the boot issue for me as well.

Thanks,
Kurt

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