linux-kernel - Re: commit 894d1b3db41c leads to frequent hangs when booting

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Message-ID: <CANDhNCpUWk_7Ocp0fvvjsLgZavcxvFcr3ac6psaZOa0xySfxZw@mail.gmail.com>
Date: Wed, 11 Dec 2024 12:27:00 -0800
From: John Stultz <jstultz@...gle.com>
To: Thomas Gleixner <tglx@...utronix.de>
Cc: Bert Karwatzki <spasswolf@....de>, Metin.Kaya@....com, boqun.feng@...il.com, 
	bsegall@...gle.com, daniel.lezcano@...aro.org, dave@...olabs.net, 
	dietmar.eggemann@....com, joelaf@...gle.com, juri.lelli@...hat.com, 
	kernel-team@...roid.com, kprateek.nayak@....com, linux-kernel@...r.kernel.org, 
	longman@...hat.com, mgorman@...e.de, mingo@...hat.com, paulmck@...nel.org, 
	peterz@...radead.org, qyousef@...alina.io, rostedt@...dmis.org, 
	vincent.guittot@...aro.org, vschneid@...hat.com, will@...nel.org, 
	xuewen.yan94@...il.com, zezeozue@...gle.com
Subject: Re: commit 894d1b3db41c leads to frequent hangs when booting

On Wed, Dec 11, 2024 at 11:19 AM Thomas Gleixner <tglx@...utronix.de> wrote:
>
> On Wed, Dec 11 2024 at 19:25, Bert Karwatzki wrote:
> > I tried to debug this with CONFIG_LOCKDEP=y in v6.13-rc2, but using CONFIG_LOCKDEP=y
> > makes the hangs disappear or far less likely, and I get this warning
> > (2 examples from two boots):
> >
> > [   17.203857] [   T1337] BUG: MAX_LOCKDEP_CHAIN_HLOCKS too low!
>
> config LOCKDEP_CHAINS_BITS
>         int "Bitsize for MAX_LOCKDEP_CHAINS"
>         depends on LOCKDEP && !LOCKDEP_SMALL
>         range 10 21
>         default 16
>         help
>           Try increasing this value if you hit "BUG: MAX_LOCKDEP_CHAINS too low!" message.
>
> Can you increase the chain bits config and try again?
>

Thanks for the report and bisecting this down!

Can you double check that the following commit is in your tree? I
think it has landed just in the last few days upstream:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=82f9cc094975240885c93effbca7f4603f5de1bf

thanks
-john