Nouveau - Dec 2011 - [Bug 43428] New: Segmentation Fault in nv50_screen_fence_update

https://bugs.freedesktop.org/show_bug.cgi?id=43428

             Bug #: 43428
           Summary: Segmentation Fault in nv50_screen_fence_update
    Classification: Unclassified
           Product: Mesa
           Version: 7.11
          Platform: x86-64 (AMD64)
        OS/Version: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/DRI/nouveau
        AssignedTo: nouveau at lists.freedesktop.org
        ReportedBy: philipp-dev at knechtges.com


Created attachment 54024
  --> https://bugs.freedesktop.org/attachment.cgi?id=54024
backtrace of the crash

Nouveau in the combination with the egl_dri2 driver crashes in the
aforementioned function. The egl_gallium driver seems to work fine (tested with
Mesa 7.11.2), but this driver is unfortunately not shipped with fedora.

As the bug vanishes if I use the latest Mesa 7.12-devel (git-ccd4d43), I would
suggest that some of the patches that substitute the function
nv50_screen_fence_update are ported back to 7.11.

Thanks a lot.

For completeness: I'm using a nvidia NVS 3100M and the fedora 2.6.41 kernel.

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https://bugs.freedesktop.org/show_bug.cgi?id=43428

philipp-dev at knechtges.com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  Attachment #54024|application/octet-stream    |text/plain
          mime type|                            |

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https://bugs.freedesktop.org/show_bug.cgi?id=43428

--- Comment #1 from Marcin Slusarz <marcin.slusarz at gmail.com>
2011-12-03 05:20:58 PST ---
Created attachment 54088
  --> https://bugs.freedesktop.org/attachment.cgi?id=54088
simple fix

Cherry-picking 3069a7eaa5d83e7f41616347ba244c0dc0d944ae (and
27e77cb902b4f7f5e127dcd78951e3167f13d59c) to 7.11 should fix it.

Alternatively we could apply attached patch.


Can you verify both patches fix your crash?

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philipp-dev at knechtges.com changed:

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

--- Comment #2 from philipp-dev at knechtges.com 2011-12-07 04:42:49 PST ---
The attached patch as well as the commit
3069a7eaa5d83e7f41616347ba244c0dc0d944ae fix the bug. The commit 3069a7ea seems
to be sufficient, what also explains why it even worked with mesa master before
you commited 27e77cb902b4f7f5e127dcd78951e3167f13d59c. Thanks a lot :)

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--- Comment #3 from Marcin Slusarz <marcin.slusarz at gmail.com>
2011-12-11 08:07:31 PST ---
Commited to 7.11. Thanks.

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