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

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Message-ID: <20190702083536.vt346ysqmq6q23iz@linutronix.de>
Date:   Tue, 2 Jul 2019 10:35:36 +0200
From:   Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:     Kurt Kanzenbach <kurt.kanzenbach@...utronix.de>
Cc:     Steven Rostedt <rostedt@...dmis.org>,
        Corey Minyard <cminyard@...sta.com>,
        Corey Minyard <minyard@....org>,
        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

On 2019-07-02 09:04:18 [+0200], Kurt Kanzenbach wrote:
> > 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.

Okay. So the original Corey fix as in v5.0.14-rt9 works for everyone.
Peter's version as I picked it up for v5.0.21-rt14 is causing problems
for two persons now.

I'm leaning towards reverting it back to old version for now…

> Thanks,
> Kurt

Sebastian