[Bug 104462] [SKL] GPU HANG: ecode 9:0:0x85dffffb, in BattleBlockThea [2678], reason: Hang on rcs0, action: reset

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=104462

--- Comment #4 from vadym <vadym.shovkoplias at globallogic.com> ---
Issue is reproducible on my laptop:

OS: Ubuntu 17.10 64-bit
CPU: Intel® Core™ i7-7500U CPU @ 2.70GHz × 4
GPU: Intel® HD Graphics 620 (Kaby Lake GT2)
mesa: OpenGL ES 3.2 Mesa 17.2.4
kernel: 4.13.0-31-generic

Bisected to bad commit:

ea0d2e98ecb369ab84e78c84709c0930ea8c293a is the first bad commit
commit ea0d2e98ecb369ab84e78c84709c0930ea8c293a
Author: Kenneth Graunke <kenneth at whitecape.org>
Date:   Thu Oct 5 20:31:01 2017 -0700

    i965: Disable auxiliary buffers when there are self-dependencies.

    Jason and I investigated several OpenGL CTS failures where the tests
    bind the same texture for rendering and texturing, at the same time.
    This has defined results as long as the reads happen before writes,
    or the regions are non-overlapping.  Normally, this just works out.

    However, CCS can cause problems.  If the shader is reading one set of
    pixels, and writing to different pixels that are adjacent, they may end
    up being covered by the same CCS block.  So rendering may be writing a
    CCS block, while the sampler is trying to read it.  Corruption ensues.

    Disabling CCS is unfortunate, but safe.

    Fixes several KHR-GL45.texture_barrier.* subtests.

    Reviewed-by: Nanley Chery <nanley.g.chery at intel.com>
    Reviewed-by: Jason Ekstrand <jason at jlekstrand.net>


With the latest dev version of mesa 18.1.0-devel(513c2263) issue is not
reproducible. Also I found out that this issue was fixed by the following
series of commits:

df13588d21 i965: Stop disabling aux during texture preparation
20f70ae385 i965/draw: Set NEW_AUX_STATE when draw aux changes
e52a9f18d6 i965: Replace draw_aux_buffer_disabled with draw_aux_usage
468ea3cc45 i965/surface_state: Drop brw_aux_surface_disabled
d38ec24f53 i965/miptree: Add an aux_disabled parameter to render_aux_usage

Bug can be closed now.

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