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

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Message-ID: <CAK7LNAS0wreFRe4LmvecY7b3i+H3nkJEb+AMY9w63iOHxAcQcw@mail.gmail.com>
Date: Wed, 25 Sep 2024 20:27:03 +0900
From: Masahiro Yamada <masahiroy@...nel.org>
To: Marco Bonelli <marco@...eim.net>
Cc: "linux-kbuild@...r.kernel.org" <linux-kbuild@...r.kernel.org>, 
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: Broken Kconfig scripts in v6.11: conf/mconf stuck in endless loop
 at 100% CPU

On Wed, Sep 25, 2024 at 9:28 AM Marco Bonelli <marco@...eim.net> 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