[Bug 119861] New: Kernel BUG() when Xorg server is started

[Bug 119861] New: Kernel BUG() when Xorg server is started

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=119861

            Bug ID: 119861
           Summary: Kernel BUG() when Xorg server is started
           Product: Drivers
           Version: 2.5
    Kernel Version: 4.7-rc2
          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 219391
  --> https://bugzilla.kernel.org/attachment.cgi?id=219391&action=edit
dmesg

OS: Archlinux, 
Video adapter: NVIDIA GeForce GTX 780 Ti,
xf86-nouveau version: 1.0.12

When I run startx BUG: unable to handle kernel NULL pointer dereference appers
in dmesg and screen stays black. Problem appeared in 4.7 kernel, previous
kernels work fine.

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[Bug 119861] Kernel BUG() when Xorg server is started

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=119861

--- Comment #1 from Dmitrii Tcvetkov <demfloro@demfloro.ru> ---
Created attachment 219401
  --> https://bugzilla.kernel.org/attachment.cgi?id=219401&action=edit
Xorg.0.log

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[Bug 119861] Kernel BUG() when Xorg server is started

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=119861

--- Comment #2 from Dmitrii Tcvetkov <demfloro@demfloro.ru> ---
Created attachment 219411
  --> https://bugzilla.kernel.org/attachment.cgi?id=219411&action=edit
Xorg.conf

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[Bug 119861] Kernel BUG() when Xorg server is started

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=119861

Dmitrii Tcvetkov <demfloro@demfloro.ru> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
 Attachment #219391|application/octet-stream    |text/plain
          mime type|                            |

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[Bug 119861] Kernel BUG() when Xorg server is started using nouveau

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=119861

Dmitrii Tcvetkov <demfloro@demfloro.ru> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|Kernel BUG() when Xorg      |Kernel BUG() when Xorg
                   |server is started           |server is started using
                   |                            |nouveau

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[Bug 119861] Kernel BUG() when Xorg server is started using nouveau

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=119861

--- Comment #3 from Dmitrii Tcvetkov <demfloro@demfloro.ru> ---
Created attachment 219421
  --> https://bugzilla.kernel.org/attachment.cgi?id=219421&action=edit
kernel config

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[Bug 119861] Kernel BUG() when Xorg server is started using nouveau

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=119861

Dmitrii Tcvetkov <demfloro@demfloro.ru> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
 Attachment #219421|application/octet-stream    |text/plain
          mime type|                            |

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[Bug 119861] Kernel BUG() when Xorg server is started using nouveau

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=119861

Lucas Stach <dev@lynxeye.de> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |dev@lynxeye.de

--- Comment #4 from Lucas Stach <dev@lynxeye.de> ---
Probably the same bug as seen on imx-drm by Philipp and fixed with the
following 2 patches:
https://patchwork.kernel.org/patch/9151037/
https://patchwork.kernel.org/patch/9151039/

Please test if those also fix this bug. Thanks.

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[Bug 119861] Kernel BUG() when Xorg server is started using nouveau

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=119861

Dmitrii Tcvetkov <demfloro@demfloro.ru> changed:

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

--- Comment #5 from Dmitrii Tcvetkov <demfloro@demfloro.ru> ---
(In reply to Lucas Stach from comment #4)
> Probably the same bug as seen on imx-drm by Philipp and fixed with the
> following 2 patches:
> https://patchwork.kernel.org/patch/9151037/
> https://patchwork.kernel.org/patch/9151039/
> 
> Please test if those also fix this bug. Thanks.

Thanks, the patch helps on 4.7-rc2, Xorg starts like with 4.6 without errors in
dmesg.

Although 4.7-rc3 panics with same .config even without the patch (I can't see
anything on screen and I assume it's a panic because kernel reacts on panic=
parameter). Looks like it is another issue. I'll make separate report when get
any info with netconsole.

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[Bug 119861] Kernel BUG() when Xorg server is started using nouveau

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=119861

Dmitrii Tcvetkov <demfloro@demfloro.ru> changed:

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

--- Comment #6 from Dmitrii Tcvetkov <demfloro@demfloro.ru> ---
commit fffc5f59f2c68ca859c3f92b224393ed3adbe1ca
Author: Philipp Zabel <p.zabel@pengutronix.de>
Date:   Thu Jun 2 19:27:51 2016 +0200

    drm/crtc: fix connector reference counting mismatch in
drm_crtc_helper_set_config

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