Re: [PATCH RT v2] Fix a lockup in wait_for_completion() and friends

[Steven Rostedt]

On Mon, 1 Jul 2019 14:09:49 -0500
Corey Minyard <minyard@xxxxxxx> 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@xxxxxxxxxxxxx> 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

Attachment: config
Description: Binary data

Attachment: dmesg
Description: Binary data