[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 #2 from lu hua <huax.lu at intel.com> ---
Some kms_flip case also has this issue.
@test: Intel_gpu_tools/igt_kms_flip_vblank-vs-hang-interruptible
returncode: 0
info: @@@Returncode: 0

test case start at: Sun Nov  2 17:03:29 2014
test case end at:   Sun Nov  2 17:04:15 2014

Errors:


Dmesg:
<6>[   82.897180] [drm] stuck on render ring
<6>[   82.905149] [drm] GPU HANG: ecode 0:0x97f4fffe, in kms_flip [4654],
reason: Ring hung, action: reset
<6>[   82.905153] [drm] GPU hangs can indicate a bug anywhere in the entire gfx
stack, including userspace.
<6>[   82.905155] [drm] Please file a _new_ bug report on bugs.freedesktop.org
against DRI -> DRM/Intel
<6>[   82.905157] [drm] drm/i915 developers can then reassign to the right
component if it's not a kernel issue.
<6>[   82.905160] [drm] The gpu crash dump is required to analyze gpu hangs, so
please always attach it.
<6>[   82.905162] [drm] GPU crash dump saved to /sys/class/drm/card0/error
<6>[   82.906904] [drm] Simulated gpu hang, resetting stop_rings
<5>[   82.906910] drm/i915: Resetting chip after gpu hang
<6>[   91.914805] [drm] stuck on render ring
<6>[   91.922612] [drm] GPU HANG: ecode 0:0x97f4fffe, in kms_flip [4654],
reason: Ring hung, action: reset
<3>[   91.922791] [drm:__vlv_force_wake_get [i915]] *ERROR* Timed out: waiting
for Render to ack.
<6>[   91.924479] [drm] Simulated gpu hang, resetting stop_rings
<5>[   91.924486] drm/i915: Resetting chip after gpu hang
<6>[  100.936360] [drm] stuck on render ring
<6>[  100.944273] [drm] GPU HANG: ecode 0:0x97f4fffe, in kms_flip [4654],
reason: Ring hung, action: reset
<6>[  100.946063] [drm] Simulated gpu hang, resetting stop_rings
<5>[  100.946069] drm/i915: Resetting chip after gpu hang
<6>[  108.947934] [drm] stuck on render ring
<6>[  108.955718] [drm] GPU HANG: ecode 0:0x97f4fffe, in kms_flip [4654],
reason: Ring hung, action: reset
<6>[  108.957675] [drm] Simulated gpu hang, resetting stop_rings
<5>[  108.957680] drm/i915: Resetting chip after gpu hang

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