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From: Peter Wu <peter@lekensteyn.nl>
Newsgroups: linux.kernel
Subject: Re: 'kbuild' merge before 4.9-rc1 breaks build and boot
Date: Mon, 07 Nov 2016 22:40:02 +0100
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X-Original-Cc: Michal Marek <mmarek@suse.com>, Al Viro <viro@zeniv.linux.org.uk>, Oliver Hartkopp <socketcan@hartkopp.net>, linux-kernel@vger.kernel.org, linux-kbuild@vger.kernel.org, Nicholas Piggin <npiggin@gmail.com>
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On Mon, Nov 07, 2016 at 02:10:12PM -0500, Vince Weaver wrote:
> On Thu, 27 Oct 2016, Peter Wu wrote:
> 
> > I can confirm Olivers issue, the current mainline kernel fails to boot
> > on kernels with CONFIG_MODVERSIONS=y. Bisection points to:
> > 
> >     commit 784d5699eddc55878627da20d3fe0c8542e2f1a2
> >     Author: Al Viro <viro@zeniv.linux.org.uk>
> >     Date:   Mon Jan 11 11:04:34 2016 -0500
> > > WARNING: "memset" [sound/usb/snd-usbmidi-lib.ko] has no CRC!
> > > WARNING: "__fentry__" [sound/usb/snd-usbmidi-lib.ko] has no CRC!
> > > WARNING: "memcpy" [sound/usb/snd-usbmidi-lib.ko] has no CRC!
> > > WARNING: "__sw_hweight32" [sound/usb/snd-usbmidi-lib.ko] has no CRC!
> 
> Has any progress been made with this problem?
> 
> I'm also encountering it on my debian-unstable box on any kernel more 
> recent than 4.9-rc1 (up to and including 4.9-rc4).  I am glad someone 
> managed to isolate it as I was unable to get a clean bisect.
> 
> Vince

The original kbuild issue went in via
merge commit 84d69848c97faab0c25aa2667b273404d2e2a64a which notes:

 - EXPORT_SYMBOL for asm source by Al Viro.

   This does bring a regression, because genksyms no longer generates
   checksums for these symbols (CONFIG_MODVERSIONS). Nick Piggin is
   working on a patch to fix this.

   Plus, we are talking about functions like strcpy(), which rarely
   change prototypes.

Adding Nicholas in the cc, hopefully he can give a status update.

Kind regards,
Peter