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

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Message-ID: <87wmg69gex.ffs@tglx>
Date: Wed, 11 Dec 2024 20:19:02 +0100
From: Thomas Gleixner <tglx@...utronix.de>
To: Bert Karwatzki <spasswolf@....de>, jstultz@...gle.com
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 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,

        tglx