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

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Message-ID: <20190701161840.1a53c9e4@gandalf.local.home>
Date:   Mon, 1 Jul 2019 16:18:40 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Corey Minyard <minyard@....org>
Cc:     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,
        Corey Minyard <cminyard@...sta.com>
Subject: Re: [PATCH RT v2] Fix a lockup in wait_for_completion() and friends

On Mon, 1 Jul 2019 14:09:49 -0500
Corey Minyard <minyard@....org> wrote:

> On Fri, Jun 28, 2019 at 09:49:03PM -0400, Steven Rostedt wrote:
> > On Fri, 10 May 2019 12:33:18 +0200
> > Sebastian Andrzej Siewior <bigeasy@...utronix.de> wrote:

> > 
> > When I applied this patch to 4.19-rt, I get the following lock up:  
> 
> I was unable to reproduce, and I looked at the code and I can't really
> see a connection between this change and this crash.
> 
> Can you reproduce at will?  If so, can you send a testcase?
> 

Yes, it wont boot. There is no testcase as I don't even make it to a
boot prompt. I applied the patch and it crashes, I remove the patch and
it boots without issue.

Attached is the full dmesg and the config used. I applied it to

  ae97a0ba0197fb424008a317b79bebacd6a50213
  Linux 4.19.56-rt23

It works fine for 5.0.14-rt9 where it was added.

-- Steve

Download attachment "config" of type "application/octet-stream" (129979 bytes)

Download attachment "dmesg" of type "application/octet-stream" (46707 bytes)