[Bug 80876] New: luxrays/slg4 hangs GPU (CEDAR)

[Bug 80876] New: luxrays/slg4 hangs GPU (CEDAR)

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https://bugs.freedesktop.org/show_bug.cgi?id=80876

          Priority: medium
            Bug ID: 80876
          Assignee: dri-devel@lists.freedesktop.org
           Summary: luxrays/slg4 hangs GPU (CEDAR)
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: awatry@gmail.com
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: git
         Component: Drivers/Gallium/r600
           Product: Mesa

Created attachment 102222
  --> https://bugs.freedesktop.org/attachment.cgi?id=102222&action=edit
luxrays diff/patch to disable image support while reproducing bug.

While working on getting the Luxrays slg4 program running (which is invoked as
part of the luxmark CL-based raytracing benchmark), I encountered some GPU
hangs on the evergreen card I'm using (CEDAR, Radeon 5400-series).

Hardware:
Core i7-2600k
16GB DDR3
Radeon 5400-series PCI express w/ dual 1080p monitors

Software:
Mesa: Git master
LLVM: 3.5svn
drm: fairly recent git
libclc: git master + a few extra patches to implement missing built-ins
luxrays: From http://src.luxrender.net/luxrays, with the attached patch.

Steps:
1) Checkout luxrays source from the mercurial repository
2) Apply patch to disable image support in the renderer
3) Build luxrays from source (cmake).
4) run bin/slg4
5) Watch the UI start to pop-up and the GPU reset.

dmesg, kernel source, llvm bitcode to be attached.  rlockup_*.c cs trace
available as a 35MB gzipped C file (>300MB uncompressed).

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[Bug 80876] luxrays/slg4 hangs GPU (CEDAR)

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https://bugs.freedesktop.org/show_bug.cgi?id=80876

--- Comment #1 from Aaron Watry <awatry@gmail.com> ---
Created attachment 102223
  --> https://bugs.freedesktop.org/attachment.cgi?id=102223&action=edit
Kernel source for luxrays

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[Bug 80876] luxrays/slg4 hangs GPU (CEDAR)

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https://bugs.freedesktop.org/show_bug.cgi?id=80876

--- Comment #2 from Aaron Watry <awatry@gmail.com> ---
Created attachment 102224
  --> https://bugs.freedesktop.org/attachment.cgi?id=102224&action=edit
dmesg from luxrays GPU hang/reset

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[Bug 80876] luxrays/slg4 hangs GPU (CEDAR)

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https://bugs.freedesktop.org/show_bug.cgi?id=80876

--- Comment #3 from Aaron Watry <awatry@gmail.com> ---
Grumble..  I was just attempting to get the bitcode since I had lost my
previous dump of that... and now for some reason the GPU's not locking and I'm
instead getting an LLVM diagnostic handler and a segfault due to invalid reads
(according to valgrind).

I'm pretty sure I'll be able to reproduce this, but part of my software stack
needs to be rebuild first.

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[Bug 80876] luxrays/slg4 hangs GPU (CEDAR)

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https://bugs.freedesktop.org/show_bug.cgi?id=80876

--- Comment #4 from Aaron Watry <awatry@gmail.com> ---
Created attachment 102226
  --> https://bugs.freedesktop.org/attachment.cgi?id=102226&action=edit
bitcode, assembly, and rest of stderr from slg4 run

This contains the llvm bitcode, R600 assembly, and the rest of the stdout as
generated from:
R600_DUMP_SHADERS=1 RADEON_DUMP_SHADERS=1 R600_DEBUG=cs,compute,trace_cs
bin/slg4 2> bitcode.ll

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[Bug 80876] luxrays/slg4 hangs GPU (CEDAR)

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https://bugs.freedesktop.org/show_bug.cgi?id=80876

--- Comment #5 from Aaron Watry <awatry@gmail.com> ---
The bitcode and hangs were all reproduced with luxrays commit 2099 (hg up -r
2099) and the image support disabling patch applied. Commit 2099 is the same as
was used for the luxrender_v1.3.1 tag.

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[Bug 80876] luxrays/slg4 hangs GPU (CEDAR)

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https://bugs.freedesktop.org/show_bug.cgi?id=80876

Jan Vesely <jv356@scarletmail.rutgers.edu> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Blocks|                            |99553


Referenced Bugs:

https://bugs.freedesktop.org/show_bug.cgi?id=99553
[Bug 99553] Tracker bug for runnning OpenCL applications on Clover
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[Bug 80876] luxrays/slg4 hangs GPU (CEDAR)

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https://bugs.freedesktop.org/show_bug.cgi?id=80876

GitLab Migration User <gitlab-migration@fdo.invalid> changed:

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

--- Comment #6 from GitLab Migration User <gitlab-migration@fdo.invalid> ---
-- GitLab Migration Automatic Message --

This bug has been migrated to freedesktop.org's GitLab instance and has been
closed from further activity.

You can subscribe and participate further through the new bug through this link
to our GitLab instance: https://gitlab.freedesktop.org/mesa/mesa/issues/515.

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