https://bugs.freedesktop.org/show_bug.cgi?id=91865

--- Comment #1 from Dieter Nützel <Dieter@nuetzel-hh.de> ---
Even with R600_DEBUG=nosb

mesa-demos/glsl> ./gsraytrace 
Gallium debugger active. The hang detection timout is 1000 ms.
ATTENTION: default value of option vblank_mode overridden by environment.
GL_RENDERER = Gallium 0.4 on AMD TURKS (DRM 2.43.0, LLVM 3.8.0)

ESC                 = exit demo
left mouse + drag   = rotate camera

dd: GPU hang detected!
dd: Aborting the process...
Abort

OpenGL renderer string: Gallium 0.4 on AMD TURKS (DRM 2.43.0, LLVM 3.8.0)
OpenGL core profile version string: 3.3 (Core Profile) Mesa 11.1.0-devel
(git-6e37304)

I'll attach
dmesg-4.2.0-1.gefc468a-desktop.log
gsraytrace_31672_00000000 (Marek's GREAT Gallium debugger log)

[ 5676.604919] radeon 0000:01:00.0: ring 0 stalled for more than 31033msec
[ 5676.604988] radeon 0000:01:00.0: GPU lockup (current fence id
0x00000000000a9cea last fence id 0x00000000000a9d18 on ring 0)
[ 5676.647958] radeon 0000:01:00.0: Saved 1479 dwords of commands on ring 0.
[ 5676.647983] radeon 0000:01:00.0: GPU softreset: 0x0000000D
[ 5676.647986] radeon 0000:01:00.0:   GRBM_STATUS               = 0xF7631028
[ 5676.647988] radeon 0000:01:00.0:   GRBM_STATUS_SE0           = 0xF8000002
[ 5676.647990] radeon 0000:01:00.0:   GRBM_STATUS_SE1           = 0x00000007
[ 5676.647992] radeon 0000:01:00.0:   SRBM_STATUS               = 0x200000C0
[ 5676.647994] radeon 0000:01:00.0:   SRBM_STATUS2              = 0x00000000
[ 5676.647996] radeon 0000:01:00.0:   R_008674_CP_STALLED_STAT1 = 0x00000000
[ 5676.647998] radeon 0000:01:00.0:   R_008678_CP_STALLED_STAT2 = 0x400C0000
[ 5676.648000] radeon 0000:01:00.0:   R_00867C_CP_BUSY_STAT     = 0x00048002
[ 5676.648002] radeon 0000:01:00.0:   R_008680_CP_STAT          = 0x80268647
[ 5676.648004] radeon 0000:01:00.0:   R_00D034_DMA_STATUS_REG   = 0x44483106
[ 5676.664891] radeon 0000:01:00.0: GRBM_SOFT_RESET=0x00007F6B
[ 5676.664945] radeon 0000:01:00.0: SRBM_SOFT_RESET=0x00100100
[ 5676.666105] radeon 0000:01:00.0:   GRBM_STATUS               = 0x00003828
[ 5676.666107] radeon 0000:01:00.0:   GRBM_STATUS_SE0           = 0x00000007
[ 5676.666109] radeon 0000:01:00.0:   GRBM_STATUS_SE1           = 0x00000007
[ 5676.666111] radeon 0000:01:00.0:   SRBM_STATUS               = 0x200000C0
[ 5676.666113] radeon 0000:01:00.0:   SRBM_STATUS2              = 0x00000000
[ 5676.666115] radeon 0000:01:00.0:   R_008674_CP_STALLED_STAT1 = 0x00000000
[ 5676.666117] radeon 0000:01:00.0:   R_008678_CP_STALLED_STAT2 = 0x00000000
[ 5676.666119] radeon 0000:01:00.0:   R_00867C_CP_BUSY_STAT     = 0x00000000
[ 5676.666121] radeon 0000:01:00.0:   R_008680_CP_STAT          = 0x00000000
[ 5676.666124] radeon 0000:01:00.0:   R_00D034_DMA_STATUS_REG   = 0x44C83D57
[ 5676.666158] radeon 0000:01:00.0: GPU reset succeeded, trying to resume
[ 5676.689479] [drm] enabling PCIE gen 2 link speeds, disable with
radeon.pcie_gen2=0
[ 5676.692387] [drm] PCIE GART of 1024M enabled (table at 0x0000000000274000).
[ 5676.692506] radeon 0000:01:00.0: WB enabled
[ 5676.692509] radeon 0000:01:00.0: fence driver on ring 0 use gpu addr
0x0000000080000c00 and cpu addr 0xffff88003723cc00
[ 5676.692510] radeon 0000:01:00.0: fence driver on ring 3 use gpu addr
0x0000000080000c0c and cpu addr 0xffff88003723cc0c
[ 5676.694278] radeon 0000:01:00.0: fence driver on ring 5 use gpu addr
0x0000000000072118 and cpu addr 0xffffc90003432118
[ 5676.710865] [drm] ring test on 0 succeeded in 2 usecs
[ 5676.710877] [drm] ring test on 3 succeeded in 7 usecs
[ 5676.887988] [drm] ring test on 5 succeeded in 2 usecs
[ 5676.887997] [drm] UVD initialized successfully.
[ 5676.935630] [drm] ib test on ring 0 succeeded in 0 usecs
[ 5676.935687] [drm] ib test on ring 3 succeeded in 0 usecs
[ 5677.587054] [drm] ib test on ring 5 succeeded

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