[Bug 35483] New: util_blit_pixels_writemask: crash in line 322 of src/gallium/auxiliary/util/u_blit.c

[Bug 35483] New: util_blit_pixels_writemask: crash in line 322 of src/gallium/auxiliary/util/u_blit.c

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=35483

           Summary: util_blit_pixels_writemask: crash in line 322 of
                    src/gallium/auxiliary/util/u_blit.c
           Product: Mesa
           Version: 7.10
          Platform: x86 (IA32)
        OS/Version: Linux (All)
            Status: NEW
          Severity: critical
          Priority: medium
         Component: Drivers/Gallium/r300
        AssignedTo: dri-devel@lists.freedesktop.org
        ReportedBy: debian@carbon-project.org


Created an attachment (id=44648)
 --> (https://bugs.freedesktop.org/attachment.cgi?id=44648)
Backtrace of the crash (Tropico with Wine 1.3.16)

When switching to (or starting a game when the last setting was) the hardware
accelerated mode in Tropico, the game immediately crashes with the attached
backtrace.

Please note, that I wasn't able to attach an GDB to Wine/Tropic, if I do, I get
tons of SIGSEGVs in Tropico before I get anywhere close to this bug. So I fear
the Wine-generated backtrace must do. If you need further information, beyond
the following, please let me know.

DDX: 6.14.0
X.org: 1.9.4.901 (1.9.5 RC 1)
Kernel: 2.6.38
libdrm2: 2.4.24
Mesa: 7.10

The "Severity" was set in accordance with
<https://bugs.freedesktop.org/page.cgi?id=fields.html#bug_severity> where a
crash is named as critical.

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[Bug 35483] util_blit_pixels_writemask: crash in line 322 of src/gallium/auxiliary/util/u_blit.c

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=35483

--- Comment #1 from Henri Verbeet <hverbeet@gmail.com> 2011-03-21 02:28:04 PDT ---
Created an attachment (id=44652)
 View: https://bugs.freedesktop.org/attachment.cgi?id=44652
 Review: https://bugs.freedesktop.org/review?bug=35483&attachment=44652

patch

You can't tell from the backtrace, but I think I know what this is. Wine
sometimes does FBO blits directly to the front buffer. This currently tends to
crash due to the front buffer surface not being created yet. The attached patch
should help with the crash, but it may not be enough to make the actual blit
work correctly.

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[Bug 35483] util_blit_pixels_writemask: crash in line 322 of src/gallium/auxiliary/util/u_blit.c

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=35483

--- Comment #2 from Kai <debian@carbon-project.org> 2011-03-21 04:41:34 PDT ---
(In reply to comment #1)
> You can't tell from the backtrace, but I think I know what this is. Wine
> sometimes does FBO blits directly to the front buffer. This currently tends to
> crash due to the front buffer surface not being created yet. The attached patch
> should help with the crash, but it may not be enough to make the actual blit
> work correctly.

Your guess was right, the patch from attachment 44652 fixes the bug. Tropico
works perfectly now with hardware 3D acceleration enabled (though it's a little
bit slow).

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[Bug 35483] util_blit_pixels_writemask: crash in line 322 of src/gallium/auxiliary/util/u_blit.c

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=35483

Marek Olšák <maraeo@gmail.com> changed:

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

--- Comment #3 from Marek Olšák <maraeo@gmail.com> 2011-03-29 15:53:57 PDT ---
Fixed by Henri's commit 5d7c27f5ec2f30c264dc2d53c4980970b3a13ee5. I am
cherry-picking it to the 7.9 and 7.10 branches. Closing.

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