[Bug 85684] [BYT]igt/drv_hangman sporadically causes *ERROR* Timed out: waiting for Render to ack

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=85684

--- Comment #1 from lu hua <huax.lu at intel.com> ---
gem_reset_stats also has this issue.

@test: Intel_gpu_tools/igt_gem_reset_stats_reset-count-blt
returncode: 0
info: @@@Returncode: 0

test case start at: Thu Oct 30 12:32:10 2014
test case end at:   Thu Oct 30 12:32:20 2014

Errors:


Dmesg:
<6>[  108.951070] [drm] stuck on blitter ring
<6>[  108.958779] [drm] GPU HANG: ecode 2:0xe77ffff3, in gem_reset_stats
[5973], reason: Ring hung, action: reset
<6>[  108.958787] [drm] GPU hangs can indicate a bug anywhere in the entire gfx
stack, including userspace.
<6>[  108.958789] [drm] Please file a _new_ bug report on bugs.freedesktop.org
against DRI -> DRM/Intel
<6>[  108.958792] [drm] drm/i915 developers can then reassign to the right
component if it's not a kernel issue.
<6>[  108.958794] [drm] The gpu crash dump is required to analyze gpu hangs, so
please always attach it.
<6>[  108.958797] [drm] GPU crash dump saved to /sys/class/drm/card0/error
<3>[  108.958906] [drm:__vlv_force_wake_get [i915]] *ERROR* Timed out: waiting
for Render to ack.
<6>[  108.960558] [drm] Simulated gpu hang, resetting stop_rings
<5>[  108.960564] drm/i915: Resetting chip after gpu hang

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