linux-kernel - Re: [Intel-gfx] 4.10-rc2 oops in DRM connector code

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20170111154038.GK18077@nuc-i3427.alporthouse.com>
Date:   Wed, 11 Jan 2017 15:40:38 +0000
From:   Chris Wilson <chris@...is-wilson.co.uk>
To:     Dave Hansen <dave.hansen@...el.com>
Cc:     Daniel Vetter <daniel.vetter@...el.com>,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        David Airlie <airlied@...ux.ie>,
        intel-gfx <intel-gfx@...ts.freedesktop.org>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [Intel-gfx] 4.10-rc2 oops in DRM connector code

On Wed, Jan 11, 2017 at 07:24:45AM -0800, Dave Hansen wrote:
> On 01/10/2017 11:43 PM, Daniel Vetter wrote:
> > On Tue, Jan 10, 2017 at 08:52:47AM -0800, Dave Hansen wrote:
> >> On 01/10/2017 02:31 AM, Daniel Vetter wrote:
> >>> commit e73ab00e9a0f1731f34d0620a9c55f5c30c4ad4e
> >>> Author: Daniel Vetter <daniel.vetter@...ll.ch>
> >>> Date:   Sun Dec 18 14:35:45 2016 +0100
> >>>
> >>>     drm: prevent double-(un)registration for connectors
> >>>
> >>> Lack of that would perfectly explain that oops ... Otherwise still no idea
> >>> what's going wrong.
> >> No...  That's not in mainline as far as I can see.  Should I test with
> >> it applied?
> > Hm, I guess failed to cc: stable that one properly, iirc we decided the
> > race fix is too academic and can't be hit in reality ;-)
> > 
> > Testing would be great. Probably conflicts because we extracted
> > drm_connector.c only recently, but running s/drm_connector\.c/drm_crtc.c/
> > over the diff and then applying with some fudge should take care of that.
> 
> It doesn't apply to mainline, with or without the substitution you suggest.

I was hoping that the locking was the real cause here and would be an
easy fix to apply. I did have a look at trying to reorder the DP-MST
worker with driver registration. Hacky to say the least.
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre

View attachment "0001-dp-mst-register.patch" of type "text/x-diff" (1996 bytes)