linux-kernel - Re: v5.9-rc3-rt3 boot time networking lockdep splat

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Message-ID: <4080cd7396e091b4864d58c452ecd13f6c3bbda9.camel@gmx.de>
Date:   Tue, 08 Sep 2020 18:17:16 +0200
From:   Mike Galbraith <efault@....de>
To:     Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-rt-users <linux-rt-users@...r.kernel.org>,
        Steven Rostedt <rostedt@...dmis.org>
Subject: Re: v5.9-rc3-rt3 boot time networking lockdep splat

On Tue, 2020-09-08 at 18:02 +0200, Sebastian Andrzej Siewior wrote:
> On 2020-09-08 17:59:31 [+0200], Mike Galbraith wrote:
> > > I have no idea how to debug this based on this report. Can you narrow
> > > it down to something?
> >
> > I instrumented what I presume is still this problem once upon a time,
> > structures containing locks are allocated/initialized/freed again and
> > again with no cleanup until we increment into the wall.
>
> Any idea what it is?

No, that was quite some time ago.

> > > Is Lappy new, got a new something or has a new config switch? I'm just
> > > curious if this something or something that was always there but
> > > remained undetected.
> >
> > Nah, this is nothing new.  Turn lockdep on in RT, it's just a matter of
> > time before it turns itself off.  It's usually just not _that_ quick.
>
> Okay. So I have few boxes which run over the weekend without this splat.

Maybe obese config (attached) related.  Lappy is an aging HP X360.

	-Mike

View attachment "config" of type "text/plain" (214019 bytes)