Nouveau - Jan 2018 - [Bug 104672] New: [NVAC] Compiz segfaults on login on Ubuntu 17.10 with Unity 7 (kernel DRM bug?)

https://bugs.freedesktop.org/show_bug.cgi?id=104672

            Bug ID: 104672
           Summary: [NVAC] Compiz segfaults on login on Ubuntu 17.10 with
                    Unity 7 (kernel DRM bug?)
           Product: Mesa
           Version: git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/DRI/nouveau
          Assignee: nouveau at lists.freedesktop.org
          Reporter: rsalvaterra at gmail.com
        QA Contact: nouveau at lists.freedesktop.org

NVIDIA ION system (Atom 330 + NVAC) running Mesa git from padoka's PPA on
Ubuntu 17.10 with Unity 7. Compiz immediately segfaults on login (returns to
the lightdm greeter) on Linux 4.15-rc8. Linux 4.14.13 works fine.

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Pierre Moreau <pierre.morrow at free.fr> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |NEEDINFO

--- Comment #1 from Pierre Moreau <pierre.morrow at free.fr> ---
Could you please provide the output of dmesg after the segfault, as well as the
X logs (/var/log/Xorg.0.log, or wherever it is on your computer)?
If you could bisect the kernel between 4.14.13 and 4.15-rc8, that would be
awesome (for example, running `git bisect start --term-good=v4.14
--term-bad=v4.15-rc8 -- drivers/gpu/drm/nouveau`, see ). I’ll try to give
4.15-rc8 a spin on my laptop tonight.

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--- Comment #2 from Rui Salvaterra <rsalvaterra at gmail.com> ---
(In reply to Pierre Moreau from comment #1)
> Could you please provide the output of dmesg after the segfault, as well as
> the X logs (/var/log/Xorg.0.log, or wherever it is on your computer)?
Sure, later today (as of now I only have ssh access to the machine). 
> If you could bisect the kernel between 4.14.13 and 4.15-rc8, that would be
> awesome (for example, running `git bisect start --term-good=v4.14
> --term-bad=v4.15-rc8 -- drivers/gpu/drm/nouveau`, see ). I’ll try to give
> 4.15-rc8 a spin on my laptop tonight.
I've never done a git bisection before (and I don't have the toolchain
installed, this is - was, now that all hell broke loose with Meltdown and
friends - a computer with very limited use), but I wager it's going to be
painful to do kernel compiles on an Atom 330… I may try to do so on the
weekend, but no promises. :(
Actually, I just reported this now because I was expecting this error to be
found by someone else, being so obvious. :P It's happening since 4.15-rc1
(the
first release I tested after the merge window).

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--- Comment #3 from Rui Salvaterra <rsalvaterra at gmail.com> ---
Created attachment 136805
  --> https://bugs.freedesktop.org/attachment.cgi?id=136805&action=edit
Xorg log

So I managed to configure lightdm for logging in automatically. This is what I
got on the dmesg:

[   40.419929] compiz[912]: segfault at 1a ip 00007f77455ef1e8 sp
00007ffd41c1fba0 error 4 in nouveau_dri.so[7f77453a9000+a86000]

Xorg log attached.

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--- Comment #4 from Pierre Moreau <pierre.morrow at free.fr> ---
Created attachment 136815
  --> https://bugs.freedesktop.org/attachment.cgi?id=136815&action=edit
Kernel logs with 4.15

4.15 is indeed broken on NVAC on my laptop as well (see the kernel logs
attached); I am going to run a bisect.

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Pierre Moreau <pierre.morrow at free.fr> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEEDINFO                    |ASSIGNED

--- Comment #5 from Pierre Moreau <pierre.morrow at free.fr> ---
Turns out I had an additional issue, but I think I now see the same issue as
you do, with a segfault in nouveau_dri.so when starting sddm.

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--- Comment #6 from Pierre Moreau <pierre.morrow at free.fr> ---
Created attachment 136840
  --> https://bugs.freedesktop.org/attachment.cgi?id=136840&action=edit
Tentative patch

The following patch from Ben Skeggs fixes it for me, hopefully that should also
be the case on your laptop.

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--- Comment #7 from Rui Salvaterra <rsalvaterra at gmail.com> ---
(In reply to Pierre Moreau from comment #6)
> Created attachment 136840 [details] [review]
> Tentative patch
> 
> The following patch from Ben Skeggs fixes it for me, hopefully that should
> also be the case on your laptop.
Great, thanks a lot for the quick turnaround! :) It's actually a desktop
machine, I'll give it a spin as soon as the patch hits the mainline
(hopefully
today, I saw it's part of the last DRM fixes pull request).

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--- Comment #8 from Rui Salvaterra <rsalvaterra at gmail.com> ---
I can confirm it's also fixed on my side, as expected. (I have Chrome's
GPU
process crashing, but that's an unrelated issue, since it also happens with
Linux 4.14.13.) Thanks a lot! :)

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Pierre Moreau <pierre.morrow at free.fr> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |FIXED
             Status|ASSIGNED                    |RESOLVED

--- Comment #9 from Pierre Moreau <pierre.morrow at free.fr> ---
Awesome! I saw the fixes in Linus’ tree, and since 4.15 hasn’t been tagged yet,
the fixes will be part of the initial release of 4.15.

Thank you for reporting the bug and trying out the patch! :-)

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