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

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Message-ID: <6019408.f4ZjTQluLH@markus>
Date:   Wed, 10 Jan 2018 18:14:56 +0100
From:   Markus <M4rkusXXL@....de>
To:     Josh Poimboeuf <jpoimboe@...hat.com>
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 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?

BR,
Markus