linux-kernel - Re: objtool segfault with ORC unwinder enabled

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Message-ID: <20180111041300.tr57lsn7c54ggx7c@treble>
Date:   Wed, 10 Jan 2018 22:13:00 -0600
From:   Josh Poimboeuf <jpoimboe@...hat.com>
To:     Markus <M4rkusXXL@....de>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        lkml <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>
Subject: Re: objtool segfault with ORC unwinder enabled

On Wed, Jan 10, 2018 at 06:14:56PM +0100, Markus wrote:
> On Thursday, 4 January 2018 19:25:12 CET Markus wrote:
> > On Thursday, 4 January 2018 18:32:03 CET Josh Poimboeuf wrote:
> > > On Thu, Jan 04, 2018 at 05:56:30PM +0100, Markus wrote:
> > > > On Thursday, 4 January 2018 16:46:13 CET Josh Poimboeuf wrote:
> > > > > I don't see anything unusual there.  Are there any Gentoo patches
> > > > > against either the kernel or GCC which would strip unused symbols?
> > > > 
> > > > The kernel is the vanilla kernel. (4.14.11 and also 4.15-rc6)
> > > > Its not a gentoo specific gcc patch. (Then every gentoo user would be
> > > > affected?)
> > > > 
> > > > But I enabled ld.gold as default linker like 5 years ago. Never had a
> > > > problem with this.
> > > > 
> > > > Is ld.gold supposed to fail here?
> > > > 
> > > > I switched back to ld.bfd and it seems to work.
> > > 
> > > Ah, that explains it.  With CONFIG_MODVERSIONS, the linker does some
> > > work after gcc, but before objtool.  Can you try this patch?  (Note this
> > > isn't the final patch, as this breaks the CONFIG_MODVERSIONS=n case.)
> 
> Any more final patch I should test?

Sorry, this fell off my radar.  I'll try to get a final patch soon.
(But feel free to keep bugging me if I don't!)

-- 
Josh