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

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Message-ID: <1d0d23600f87a95ce15998eaae8600ebe1d87ce6.camel@web.de>
Date: Wed, 11 Dec 2024 21:43:57 +0100
From: Bert Karwatzki <spasswolf@....de>
To: John Stultz <jstultz@...gle.com>, Thomas Gleixner <tglx@...utronix.de>
Cc: 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, 	spasswolf@....de
Subject: Re: commit 894d1b3db41c leads to frequent hangs when booting

Am Mittwoch, dem 11.12.2024 um 12:27 -0800 schrieb John Stultz:
> 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

v6.13-rc2 does not contain commit 82f9cc094975, but linux-next-20241210 does
contain it and shows the same buggy behaviour as v6.13-rc2, I'm currently
testing if linux-next-20241010 can be fixed by the same revert as v6.12-rc2.
 I didn't bisect this in the linux-next tree to avoid an overlapping bug which
also caused a hang on boot (this has already been fixed):
https://lore.kernel.org/linux-mm/CAOQ4uxgVNGmLqURdO0wf3vo=K-a2C--ZLKFzXw-22PJdkBjEdA@mail.gmail.com/T/#t

Bert Karwatzki