linux-kernel - Re: linux-next: Tree for Apr 3 (objtool)

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Date:   Thu, 4 Apr 2019 12:16:18 -0500
From:   Josh Poimboeuf <jpoimboe@...hat.com>
To:     Randy Dunlap <rdunlap@...radead.org>
Cc:     Stephen Rothwell <sfr@...b.auug.org.au>,
        Linux Next Mailing List <linux-next@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Peter Zijlstra <peterz@...radead.org>
Subject: Re: linux-next: Tree for Apr 3 (objtool)

On Wed, Apr 03, 2019 at 03:29:17PM -0700, Randy Dunlap wrote:
> On 4/3/19 1:53 PM, Josh Poimboeuf wrote:
> > On Wed, Apr 03, 2019 at 08:02:43AM -0700, Randy Dunlap wrote:
> >> On 4/3/19 1:24 AM, Stephen Rothwell wrote:
> >>> Hi all,
> >>>
> >>> Changes since 20190402:
> >>>
> >>
> >> on x86_64:
> >>
> >> arch/x86/entry/entry_64.o: warning: objtool: .entry.text+0x909: unreachable instruction
> > 
> > Your .o file looks odd.  I can't recreate the issue when I build the
> > same object.
> 
> This (randconfig) build has tracing enabled?  Could that have anything to do
> with it?

No, I can't see any reasonable explanation for it other than a buggy
toolchain.

> The randconfig file is attached.

I still can't recreate with your randconfig.

> > Did the issue only just now show up?  Can you bisect it?  What version
> > of binutils are you using?
> 
> > ld -v
> GNU ld (GNU Binutils; openSUSE Leap 42.3) 2.31.1.20180828-19
> 
> 
> My build logs show it first occurred (in my randconfig builds) in
> linux-next-20190204.

It seems really odd.  Can you do a bisect?

-- 
Josh