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

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Message-ID: <20200908151229.g24j4n4fderlm2pe@linutronix.de>
Date:   Tue, 8 Sep 2020 17:12:29 +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 2020-09-05 07:19:10 [+0200], Mike Galbraith wrote:
> Lappy, which does not use bridge, boots clean... but lock leakage
> pretty darn quickly inspires lockdep to craps its drawers.
> 
> [  209.001111] BUG: MAX_LOCKDEP_CHAIN_HLOCKS too low!
> [  209.001113] turning off the locking correctness validator.
> [  209.001114] CPU: 2 PID: 3773 Comm: Socket Thread Tainted: G S        I E     5.9.0.gc70672d-rt3-rt #8
> [  209.001117] Hardware name: HP HP Spectre x360 Convertible/804F, BIOS F.47 11/22/2017
> [  209.001118] Call Trace:
> [  209.001123]  dump_stack+0x77/0x9b
> [  209.001129]  validate_chain+0xf60/0x1230

I have no idea how to debug this based on this report. Can you narrow
it down to something?

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.
(Your other report was about something that was previously always "broken".)

Sebastian