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

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Message-ID: <20210213155203.lehuegwc3h42nebs@treble>
Date:   Sat, 13 Feb 2021 09:52:03 -0600
From:   Josh Poimboeuf <jpoimboe@...hat.com>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Xi Ruoyao <xry111@...gyan1223.wang>,
        "# 3.4.x" <stable@...r.kernel.org>,
        Arnd Bergmann <arnd@...nel.org>,
        "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 Sat, Feb 13, 2021 at 09:13:04AM -0500, Steven Rostedt wrote:
> On Sat, 13 Feb 2021 15:09:02 +0100
> Greg Kroah-Hartman <gregkh@...uxfoundation.org> wrote:
> 
> > Thanks for the patch, but no, still fails with:
> > 
> > Cannot find symbol for section 8: .text.unlikely.
> > kernel/kexec_file.o: failed
> > make[1]: *** [scripts/Makefile.build:277: kernel/kexec_file.o] Error 1
> > make[1]: *** Deleting file 'kernel/kexec_file.o'
> 
> It was just a guess.
> 
> I guess I'll need to find some time next week to set up a VM with
> binutils 2.36 (I just checked, and all my development machines have
> 2.35). Then I'll be able to try and debug it.

FWIW, I wasn't able to recreate.   I tried both binutils 2.36 and
2.36.1, with gcc 11 and a 'make allmodconfig' kernel.

-- 
Josh