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

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Message-ID: <YCf9bnsmXqRGMn+j@kroah.com>
Date:   Sat, 13 Feb 2021 17:25:18 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Josh Poimboeuf <jpoimboe@...hat.com>
Cc:     Steven Rostedt <rostedt@...dmis.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 09:52:03AM -0600, Josh Poimboeuf wrote:
> 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.

I'm using whatever the latest is in Arch, which is gcc 10.2 and binutils
2.36.  My config is here:
	https://github.com/gregkh/gregkh-linux/blob/master/stable/configs/4.4.y

thanks,

greg k-h