[Bug 120591] New: BUG() in dmesg after loading nouveau module

[Bug 120591] New: BUG() in dmesg after loading nouveau module

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=120591

            Bug ID: 120591
           Summary: BUG() in dmesg after loading nouveau module
           Product: Drivers
           Version: 2.5
    Kernel Version: 4.7-rc3
          Hardware: x86-64
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: high
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri@kernel-bugs.osdl.org
          Reporter: demfloro@demfloro.ru
        Regression: No

Created attachment 220561
  --> https://bugzilla.kernel.org/attachment.cgi?id=220561&action=edit
dmesg

OS: Arch Linux
Video adapter: GeForce GTX 780 Ti
xf86-nouveau: 1.0.12

I blacklisted nouveau module for full OS initialisation before reproducing,
then issued:
# modprobe nouveau debug=trace

After that screen becomes black and in dmesg appears:
BUG: unable to handle kernel NULL pointer dereference at 0000000000000210

Bug is not reproducible with 4.7-rc2 or earlier mainline.

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[Bug 120591] BUG() in dmesg after loading nouveau module

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=120591

--- Comment #1 from Dmitrii Tcvetkov <demfloro@demfloro.ru> ---
Created attachment 220571
  --> https://bugzilla.kernel.org/attachment.cgi?id=220571&action=edit
kernel config

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[Bug 120591] BUG() in dmesg after loading nouveau module

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=120591

Ilia Mirkin <imirkin@alum.mit.edu> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |imirkin@alum.mit.edu

--- Comment #2 from Ilia Mirkin <imirkin@alum.mit.edu> ---
Looks like

commit f045f459d925138fe7d6193a8c86406bda7e49da
Author: Ben Skeggs <bskeggs@redhat.com>
Date:   Thu Jun 2 12:23:31 2016 +1000

    drm/nouveau/fbcon: fix out-of-bounds memory accesses

does not properly deal with disabled fbdev emulation.

Can you add a

if (fbcon->helper.fbdev)

before that added line in nouveau_fbcon_init? I assume that will resolve your
issue.

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[Bug 120591] BUG() in dmesg after loading nouveau module

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=120591

--- Comment #3 from Dmitrii Tcvetkov <demfloro@demfloro.ru> ---
Created attachment 220611
  --> https://bugzilla.kernel.org/attachment.cgi?id=220611&action=edit
fix

Suggested by Ilia Mirkin

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[Bug 120591] BUG() in dmesg after loading nouveau module

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=120591

--- Comment #4 from Dmitrii Tcvetkov <demfloro@demfloro.ru> ---
Thanks, that change helped, nouveau loaded successfully, Xorg started normally.

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[Bug 120591] BUG() in dmesg after loading nouveau module

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=120591

--- Comment #5 from Dmitrii Tcvetkov <demfloro@demfloro.ru> ---
Created attachment 220621
  --> https://bugzilla.kernel.org/attachment.cgi?id=220621&action=edit
dmesg with patched kernel

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[Bug 120591] BUG() in dmesg after loading nouveau module

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=120591

Dmitrii Tcvetkov <demfloro@demfloro.ru> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |CODE_FIX

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[Bug 120591] BUG() in dmesg after loading nouveau module

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=120591

--- Comment #6 from Ilia Mirkin <imirkin@alum.mit.edu> ---
Dmitrii, you should mail that patch (as a proper commit) to bskeggs@redhat.com
and/or nouveau@lists.freedesktop.org . If you're not sure how to do that, I can
take care of that for you.

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[Bug 120591] BUG() in dmesg after loading nouveau module

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=120591

--- Comment #7 from Dmitrii Tcvetkov <demfloro@demfloro.ru> ---
Thank you for advice, I've sent the patch, mail awaits moderation.

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[Bug 120591] BUG() in dmesg after loading nouveau module

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=120591

Dmitrii Tcvetkov <demfloro@demfloro.ru> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |CLOSED

--- Comment #8 from Dmitrii Tcvetkov <demfloro@demfloro.ru> ---
commit 52dfcc5ccfbb6697ac3cac7f7ff1e712760e1216
Author: Dmitrii Tcvetkov <demfloro@demfloro.ru>
Date:   Mon Jun 20 13:52:14 2016 +0300

    drm/nouveau: fix for disabled fbdev emulation

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