linux-kernel - Re: [tip: objtool/urgent] objtool: Fix seg fault with Clang non-section symbols

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Message-ID: <CAKwvOd=GHdkvAU3u6ROSgtGqC_wrkXo8siL1nZHE-qsqSx0gsw@mail.gmail.com>
Date:   Thu, 11 Feb 2021 10:46:05 -0800
From:   Nick Desaulniers <ndesaulniers@...gle.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Xi Ruoyao <xry111@...gyan1223.wang>
Cc:     "# 3.4.x" <stable@...r.kernel.org>,
        Arnd Bergmann <arnd@...nel.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        Miroslav Benes <mbenes@...e.cz>,
        "maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)" <x86@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-tip-commits@...r.kernel.org
Subject: Re: [tip: objtool/urgent] objtool: Fix seg fault with Clang
 non-section symbols

On Thu, Feb 11, 2021 at 5:55 AM Greg Kroah-Hartman
<gregkh@...uxfoundation.org> wrote:
>
> On Thu, Feb 11, 2021 at 09:32:03PM +0800, Xi Ruoyao wrote:
> > Hi all,
> >
> > The latest GNU assembler (binutils-2.36.1) is removing unused section symbols
> > like Clang [1].  So linux-5.10.15 can't be built with binutils-2.36.1 now.  It
> > has been reported as https://bugzilla.kernel.org/show_bug.cgi?id=211693.

Xi,
Happy Lunar New Year to you, too, and thanks for the report.  Did you
observe such segfaults for older branches of stable?

> 2.36 of binutils fails to build the 4.4.y tree right now as well, but as
> objtool isn't there, I don't know what to do about it :(

Greg,
There may be multiple issues in the latest binutils release for the
kernel; we should still avoid segfaults in host tools so I do
recommend considering this patch for inclusion at least into 5.10.y.
Arnd's report in https://github.com/ClangBuiltLinux/linux/issues/1207
mentions this was found via randconfig testing, so likely some set of
configs is needed to reproduce reliably.

Do you have more info about the failure you're observing? Trolling
lore, I only see:
https://lore.kernel.org/stable/YCLeJcQFsDIsrAEc@kroah.com/
(Maybe it was reported on a different list; I only searched stable ML).
-- 
Thanks,
~Nick Desaulniers