Re: commit 894d1b3db41c leads to frequent hangs when booting

[John Stultz]

On Wed, Dec 11, 2024 at 11:19 AM Thomas Gleixner <tglx@xxxxxxxxxxxxx> 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