[Bug 89959] [SKL]igt/gem_concurrent_blit subcase sporadically causes system hang and *ERROR* blitter: timed out waiting for forcewake ack to clear.

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=89959

--- Comment #31 from cprigent <christophe.prigent at intel.com> ---
Tested on SKL-S: test seems to never end. CPU usage is 100%. We are able to end
the test with ctrl-z, no crash.
Test gem_render_copy executed just after is pass.

SKY LAKE-S1 (QA Lab) 
Hardware
Platform: SKY LAKE DT Pre Alpha
CPU : Intel(R) CPU  @ 2.3GHz (family: 6, model: 94  stepping: 0)
SoC : SKL-S (DT) 4+2 P0
Chipset PCH: Sunrise Point A0               
CRB : SKY LAKE DT DDR4 RVP08 CRB FAB1
Software 
Linux : Ubuntu 14.04 LTS 64 bits
Kernel : drm-intel-nightly cbad75dd043b82a0684e94fe3b5f994fe0c3414b 
(4.2.0-rc5) from git://anongit.freedesktop.org/drm-intel 
BIOS : SKLSE2R1.86C.B066.R00.1412251115
ME FW : 11.0.0.1100
Ksc (EC FW): 1.00
Mesa: mesa-10.6.3 ddc976368fef367e464472ebcc2ac4fd89eb9fd8 from
http://cgit.freedesktop.org/mesa/mesa/
Xf86_video_intel: 2.99.917 baec802b21387d04aebb10ac29e719a1800c5aa0 from
http://cgit.freedesktop.org/xorg/driver/xf86-video-intel/
Libdrm: libdrm-2.4.62 ba4b5ac010ab85406ec52e3906e13d58cd9aa782 from
http://cgit.freedesktop.org/mesa/drm/
Cairo: 1.14.2 from 93422b3cb5e0ef8104b8194c8873124ce2f5ea2d
http://cgit.freedesktop.org/cairo
libva: libva-1.6.0 a8008998bc0d4a76ae6927607c048e52ba50fd0e from
http://cgit.freedesktop.org/libva/
intel-driver: 1.6.0 32268c46d538667d437dc9266aa4c183e51c1286 from
http://cgit.freedesktop.org/vaapi/intel-driver
Xserver: xorg-server-1.17.2 2123f7682d522619f101b05fb75efa75dabbe371 from
http://cgit.freedesktop.org/xorg/xserver 

Kernel commit log:
commit cbad75dd043b82a0684e94fe3b5f994fe0c3414b
Author: Daniel Vetter <daniel.vetter at ffwll.ch>
Date:   Tue Aug 11 12:08:05 2015 +0200
drm-intel-nightly: 2015y-08m-11d-10h-07m-28s UTC integration manifest

igt 1.11-5c07135b

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