linux-kernel - Re: [regression drm/noveau] suspend to ram -> BOOM: exception RIP: drm_calc_vbltimestamp_from

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Message-ID: <20170714161027.5htn5jlswvfgphzw@hirez.programming.kicks-ass.net>
Date:   Fri, 14 Jul 2017 18:10:27 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Mike Galbraith <efault@....de>
Cc:     Ilia Mirkin <imirkin@...m.mit.edu>,
        LKML <linux-kernel@...r.kernel.org>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "nouveau@...ts.freedesktop.org" <nouveau@...ts.freedesktop.org>,
        David Airlie <airlied@...ux.ie>,
        Ben Skeggs <bskeggs@...hat.com>, jeyu@...nel.org
Subject: Re: [regression drm/noveau] suspend to ram -> BOOM: exception RIP:
 drm_calc_vbltimestamp_from_scanoutpos+335

On Fri, Jul 14, 2017 at 05:58:18PM +0200, Mike Galbraith wrote:
> On Fri, 2017-07-14 at 17:50 +0200, Peter Zijlstra wrote:

> > Urgh, is for some mysterious reason the __bug_table section of modules
> > ending up in RO memory?
> > 
> > I forever get lost in that link magic :/
> 
> +1
> 
> drm.ko
>  20 __bug_table   00000630  0000000000000000  0000000000000000  0004bff3  2**0
>                   CONTENTS, ALLOC, LOAD, RELOC, READONLY, DATA
> vmlinux
>  15 __bug_table   0000ba84  ffffffff81af26c0  0000000001af26c0  00cf26c0  2**0
>                   CONTENTS, ALLOC, LOAD, READONLY, DATA
> 
> Danged if I know... um um RELOC business mucks things up?

Argh, it shouldn't be READONLY for vmlinux either, but apparently that
is working for mysterious reasons.

Some architectures were in fact complaining that I broke that, and hence
patch:

b5effd3815cc ("debug: Fix __bug_table[] in arch linker scripts")

I think we need professional help with this linking stuff, but who to
ask?