linux-kernel - Re: [linux-next:master] [cfi] ce4a262098: CFI_failure_at_do_basic

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Message-ID: <CAH5fLghbP3KZjkBbQe_MMJrnRpk4M0Hn0nu=uRtKWKqmKz6OeQ@mail.gmail.com>
Date: Mon, 23 Sep 2024 09:54:38 +0200
From: Alice Ryhl <aliceryhl@...gle.com>
To: kernel test robot <oliver.sang@...el.com>
Cc: oe-lkp@...ts.linux.dev, lkp@...el.com, 
	Linux Memory Management List <linux-mm@...ck.org>, Miguel Ojeda <ojeda@...nel.org>, 
	Sami Tolvanen <samitolvanen@...gle.com>, Gatlin Newhouse <gatlin.newhouse@...il.com>, 
	Kees Cook <kees@...nel.org>, Peter Zijlstra <peterz@...radead.org>, linux-kbuild@...r.kernel.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [linux-next:master] [cfi] ce4a262098: CFI_failure_at_do_basic_setup

On Mon, Sep 23, 2024 at 4:35 AM kernel test robot <oliver.sang@...el.com> wrote:
>
> Hello,
>
> kernel test robot noticed "CFI_failure_at_do_basic_setup" on:
>
> commit: ce4a2620985cdf06c200ec0b6dce80374237697c ("cfi: add CONFIG_CFI_ICALL_NORMALIZE_INTEGERS")
> https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git master
>
> [test failed on linux-next/master 62f92d634458a1e308bb699986b9147a6d670457]

This failure is due to an LLVM bug that causes
CFI_ICALL_NORMALIZE_INTEGERS to be incompatible with KASAN and GCOV.
It has already been fixed upstream:
https://github.com/llvm/llvm-project/pull/104826 (thanks Sami!)

However, we may want to look into having Kconfig detect this case.

Alice