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

[bugzilla-daemon@freedesktop.org]

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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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