[Bug 101977] UE4 4.17 causes hang in amdgpu_cs_query_fence_status

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=101977

            Bug ID: 101977
           Summary: UE4 4.17 causes hang in amdgpu_cs_query_fence_status
           Product: Mesa
           Version: git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/Gallium/radeonsi
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: ttimo at ttimo.net
        QA Contact: dri-devel at lists.freedesktop.org

Created attachment 133142
  --> https://bugs.freedesktop.org/attachment.cgi?id=133142&action=edit
backtrace and dmesg

Ubuntu 16.04.2 LTS x86_64
kernel 4.12.4-041204-generic
Latest mesa git as of today 07/30
Latest UE4 4.17 out git branch as of today (4.17 not officially released yet)
clang 3.9 3.9.1-4ubuntu3~16.04.1 (tags/RELEASE_391/rc2) (used for mesa and UE4)

Starting the editor, or starting directly on a game, either in gl3 or gl4 mode
causes a hang. You have to use -NOSPLASH to avoid another, unrelated issue. My
typical command line looks like this:

UnrealEngine> set ver 3.9 ; env
LD_LIBRARY_PATH=$HOME/usr/lib:/usr/lib/llvm-$ver/lib
LIBGL_DRIVERS_PATH=$HOME/usr/lib/dri:/usr/lib/i386-linux-gnu/dri
LIBGL_DEBUG=verbose
VK_ICD_FILENAMES=/opt/Valve/mesa/src/amd/vulkan/dev_icd.json
./Engine/Binaries/Linux/UE4Editor-Linux-Debug -opengl4 -NOSPLASH

For GL3, pass -opengl3 on the command line and set env var
MESA_GL_VERSION_OVERRIDE=3.2 (results are the same)

Attaching backtrace and dmesg

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