From: Mike Galbraith <efault@gmx.de>
To: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: Thomas Gleixner <tglx@linutronix.de>,
LKML <linux-kernel@vger.kernel.org>,
linux-rt-users <linux-rt-users@vger.kernel.org>,
Steven Rostedt <rostedt@goodmis.org>
Subject: Re: v5.9-rc3-rt3 boot time networking lockdep splat
Date: Tue, 08 Sep 2020 17:59:31 +0200 [thread overview]
Message-ID: <a79815352e2f238b7f108e6e7202f6655f26159d.camel@gmx.de> (raw)
In-Reply-To: <20200908151229.g24j4n4fderlm2pe@linutronix.de>
On Tue, 2020-09-08 at 17:12 +0200, Sebastian Andrzej Siewior wrote:
> 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?
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.
> 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.
-Mike
next prev parent reply other threads:[~2020-09-08 19:26 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-02 15:55 [ANNOUNCE] v5.9-rc3-rt3 Sebastian Andrzej Siewior
2020-09-05 4:47 ` v5.9-rc3-rt3 boot time networking lockdep splat Mike Galbraith
2020-09-05 5:19 ` Mike Galbraith
2020-09-08 15:12 ` Sebastian Andrzej Siewior
2020-09-08 15:59 ` Mike Galbraith [this message]
2020-09-08 16:02 ` Sebastian Andrzej Siewior
2020-09-08 12:19 ` Sebastian Andrzej Siewior
2020-09-08 14:56 ` Mike Galbraith
2020-09-08 15:06 ` Sebastian Andrzej Siewior
2020-09-08 16:19 ` Mike Galbraith
2020-09-09 2:39 ` Mike Galbraith
2020-09-09 3:12 ` [ANNOUNCE] v5.9-rc3-rt3 Mike Galbraith
2020-09-09 5:07 ` Mike Galbraith
2020-09-09 5:45 ` Mike Galbraith
2020-09-09 8:20 ` Sebastian Andrzej Siewior
2020-09-09 8:56 ` Mike Galbraith
2020-09-09 8:59 ` Sebastian Andrzej Siewior
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