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

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Date:   Tue, 8 Sep 2020 18:02:14 +0200
From:   Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:     Mike Galbraith <efault@....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 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?

> > 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.

> 	-Mike

Sebastian