Re: Broken Kconfig scripts in v6.11: conf/mconf stuck in endless loop at 100% CPU

[Masahiro Yamada]

On Wed, Sep 25, 2024 at 9:28 AM Marco Bonelli <marco@xxxxxxxxxx> wrote:
>
> I was building v6.11 for PowerPC when I noticed that `make olddefconfig` hangs
> indefinitely when running `scripts/kconfig/conf` and gets stuck in what seems
> an infinite loop at 100% CPU while evaluating an expression.
>
> The issue is still present on master of linux-next. I did a bisect run and
> narrowed it down to this commit:
>
>         f79dc03fe68c79d388908182e68d702f7f1786bc kconfig: refactor choice value calculation
>
> Steps to reproduce:
>
>         git checkout v6.11
>         export ARCH=powerpc CROSS_COMPILE=powerpc-linux-
>         make distclean
>         make ppc64_defconfig
>         ./scripts/config --file .config -d PPC64
>         make olddefconfig
>         # Hangs indefinitely running scripts/kconfig/conf
>

>
> Let me know if any additional information is needed. Happy to help.


This provides enough information to figure out the issue.

I posted a patch.

Thanks.




--
Best Regards
Masahiro Yamada