[Bug 93748] [r600g]OpenCL driver causes ImageMagick to segfault

[bugzilla-dae...@freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=93748

--- Comment #6 from Jan Vesely  ---
based on the LLVM dump something is trying to do v2 load.

Do you know what noise type is used?
Guassian noise in that kernel uses sinpi and cospi which use v2float (float
load is the same as int).

can you try newer llvm version?
proper constant address space loads were implemented in r269481. it fixed
builtin functions that rely on tables, like sinpi/cospi.

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[Bug 93748] [r600g]OpenCL driver causes ImageMagick to segfault

[bugzilla-dae...@freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=93748

--- Comment #5 from nixscripter at gmail.com ---
Correction, make that MagickCore/accelerate-kernels-private.h, starting on line
798. (Argh...)

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[Bug 93748] [r600g]OpenCL driver causes ImageMagick to segfault

[bugzilla-dae...@freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=93748

--- Comment #4 from nixscripter at gmail.com ---
Oh, and before I forget, The AddNoise kernel is in MagickCore/accelerate.c,
starting on line 499.

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[Bug 93748] [r600g]OpenCL driver causes ImageMagick to segfault

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https://bugs.freedesktop.org/show_bug.cgi?id=93748

nixscripter at gmail.com changed:

   What|Removed |Added

 Attachment #121096|0   |1
is obsolete||

--- Comment #3 from nixscripter at gmail.com ---
Created attachment 124178
  --> https://bugs.freedesktop.org/attachment.cgi?id=124178=edit
AddNoise backtrace for IMv7 Git

In order to assist with this issue, I tried upgrading to the Git Version of
Imagemagick, available on GitHub:

https://github.com/ImageMagick/ImageMagick

ImageMagick master commit 5fb7d58 still fails with LLVM revision 264388 and
Mesa commit 511ce29. (I upgrade to the latest revisions every week or two, just
in case this issue could be fixed without me noticing.)

However, the traceback is now quite different, and the image does display --
for just a moment while they do some operation subsequently which makes it
segfault. Now it's in the AddNose kernel.

Hopefully the source version will make the issue easier to reproduce/debug.

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[Bug 93748] [r600g]OpenCL driver causes ImageMagick to segfault

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https://bugs.freedesktop.org/show_bug.cgi?id=93748

--- Comment #2 from nixscripter at gmail.com ---
Created attachment 121124
  --> https://bugs.freedesktop.org/attachment.cgi?id=121124=edit
GenerateNoiseImage kernel

Here is their kernel. It's rather ugly.

It has a lot of macros (like ClamptoQuantum) and functions running on the host
(mwcGenerateDifferentialNoise is elsewhere in the same file), but perhaps if
it's an LLVM assembler bug those don't matter.

The initialization code for the OpenCL context, by the way, is entirely
separate and also rather ugly (I presume so they can load it early and "drop it
in" when needed).

Here is a link to the source of my exact version (which I know is old, sorry
about that) so you can look at any surrounding context necessary:

http://distfiles.icmpv6.org/distfiles/ImageMagick-6.9.2-6.tar.xz

Note that this kernel can be found in magick/accelerate-private.h -- the error
pointing to magick/accelerate.c is where the kernel is initialized.

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[Bug 93748] [r600g]OpenCL driver causes ImageMagick to segfault

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https://bugs.freedesktop.org/show_bug.cgi?id=93748

--- Comment #1 from Jan Vesely  ---
Hi,

I had trouble locating the kernel. There's a git repo nd 6.9.X.Y release
tarballs. Unfortunately imagemagick does not tag releases. Do you know the git
commit that corresponds to to 6.2.9.6?

posting the corresponding __kernel function would suffice too.

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[Bug 93748] [r600g]OpenCL driver causes ImageMagick to segfault

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https://bugs.freedesktop.org/show_bug.cgi?id=93748

Bug ID: 93748
   Summary: [r600g]OpenCL driver causes ImageMagick to segfault
   Product: Mesa
   Version: git
  Hardware: x86-64 (AMD64)
OS: Linux (All)
Status: NEW
  Severity: normal
  Priority: medium
 Component: Drivers/Gallium/r600
  Assignee: dri-devel at lists.freedesktop.org
  Reporter: nixscripter at gmail.com
QA Contact: dri-devel at lists.freedesktop.org

Created attachment 121096
  --> https://bugs.freedesktop.org/attachment.cgi?id=121096=edit
Output of /usr/bin/display

If I compile ImageMagick with OpenCL support, and use the display utility to
view any image, the program segfaults before anything is rendered with the
attached LLVM error.

I'm using ImageMagick 6.2.9.6, though it has failed on several previous
versions also.

The relevant piece of source code is in magick/accelerate.c, a gigantic list of
OpenCL stuff (which I must admit I am ill-equipped to read). The function it
complains about, GenerateNoiseImage, seems to start on line 428.

I'm using LLVM r254897 from SVN, and Mesa commit 9214664 (r74971).

My card is:
Advanced Micro Devices, Inc. [AMD/ATI] Juniper PRO [Radeon HD 6750]

Please let me know if you need more information.

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