linux-kernel - Re: [BUG] lockdep splat using mmio tracer

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Message-ID: <20221202072028.40b62728@gandalf.local.home>
Date:   Fri, 2 Dec 2022 07:20:28 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Pekka Paalanen <ppaalanen@...il.com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Peter Zijlstra <peterz@...radead.org>, x86@...nel.org,
        Karol Herbst <kherbst@...hat.com>
Subject: Re: [BUG] lockdep splat using mmio tracer

On Fri, 2 Dec 2022 10:43:34 +0200
Pekka Paalanen <ppaalanen@...il.com> wrote:

> On Thu, 1 Dec 2022 21:31:26 -0500
> Steven Rostedt <rostedt@...dmis.org> wrote:
> 
> > I hit this while testing ftrace on an x86 32 bit VM (I've just started
> > converting my tests to run on a VM, which is find new found bugs).  
> 
> Hi Steven,
> 
> sorry, I don't think I know anymore how mmiotrace works. Surely the
> kernel has changed in those more than 10 years since I last looked at
> it. If I'm still listed as a contact for mmiotrace somewhere, maybe it
> would be best to drop me?

You're still listed as a Reviewer in the MAINTAINERS file. Which means you
only want to see patches (and possibly review them), but doesn't mean you
have to fix them ;-)

> 
> I don't mind the emails, it's nice to see people hit or touch it, but
> I'm afraid I can't help.
> 

Nice hearing from you too :-) I'll only drop you if you ask.

For now, I just don't test mmiotrace with lockdep on. But if I get some
cycles, I may try to figure out what's going on.

Cheers,

-- Steve