Created attachment 119064 [details]
dmesg with GPU_HANG

Software versions:
    4.3.0-rc5-mainline+
    OpenGL version string: 3.0 Mesa 11.1.0-devel (git-13a5805)

GPU hardware:
    OpenGL renderer string: Mesa DRI Intel(R) Skylake ULX GT2
    00:02.0 VGA compatible controller [0300]: Intel Corporation Sky Lake Integrated Graphics [8086:191e] (rev 07)

CPU hardware:
    x86_64
    Intel(R) Core(TM) m7-6Y75 CPU @ 1.20GHz

CTS version:
git@67ae88f31295

command: 
./glcts --deqp-case=ES31-CTS.shader_storage_buffer_object*

Environment:
Mesa built with: --enable-debug
export MESA_GLES_VERSION_OVERRIDE=3.1
export MESA_EXTENSION_OVERRIDE=GL_ARB_compute_shader

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When running all the texture gather tests of the OpenGL ES 3.1 CTS, execution stops after the test:
ES31-CTS.texture_gather.plain-gather-int-2darray

"intel_do_flush_locked failed: Input/output error"
dmesg shows:
[ 2105.031825] [drm] GPU HANG: ecode 9:0:0x85ddfffb, in glcts [1884], reason: Ring hung, action: reset