[Bug 85684] New: [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

            Bug ID: 85684
           Summary: [BYT]igt/drv_hangman sporadically causes *ERROR* Timed
                    out: waiting for Render to ack
           Product: DRI
           Version: unspecified
          Hardware: All
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: huax.lu at intel.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

==System Environment==
--------------------------
Regression: not sure
Non-working platforms: BYT

==kernel==
--------------------------
drm-intel-nightly/bd21cf795cf5dc278f1451d0f7a597cb1d13c2ba

==Bug detailed description==
Run 2 cycles, it happens once. 

output:
root at x-byt06:/GFX/Test/Intel_gpu_tools/intel-gpu-tools/tests# ./drv_hangman
--run-subtest error-state-capture-bsd
IGT-Version: 1.8-gab5f7ea (x86_64) (Linux:
3.18.0-rc2_drm-intel-nightly_bd21cf_20141030+ x86_64)
Subtest error-state-capture-bsd: SUCCESS (12.504s)
root at x-byt06:/GFX/Test/Intel_gpu_tools/intel-gpu-tools/tests# dmesg -r|egrep
"<[1-4]>"|grep drm
root at x-byt06:/GFX/Test/Intel_gpu_tools/intel-gpu-tools/tests# ./drv_hangman
--run-subtest error-state-capture-bsd
IGT-Version: 1.8-gab5f7ea (x86_64) (Linux:
3.18.0-rc2_drm-intel-nightly_bd21cf_20141030+ x86_64)
Subtest error-state-capture-bsd: SUCCESS (12.057s)
root at x-byt06:/GFX/Test/Intel_gpu_tools/intel-gpu-tools/tests# dmesg -r|egrep
"<[1-4]>"|grep drm
<3>[19432.618274] [drm:__vlv_force_wake_get [i915]] *ERROR* Timed out: waiting
for Render to ack.

dmesg:
[19408.408488] drv_hangman: executing
[19408.408671] drv_hangman: starting subtest error-state-capture-bsd
[19414.574594] [drm] stuck on bsd ring
[19414.582570] [drm] GPU HANG: ecode 1:0xfffffffe, in drv_hangman [9123],
reason: Ring hung, action: reset
[19414.582574] [drm] GPU hangs can indicate a bug anywhere in the entire gfx
stack, including userspace.
[19414.582576] [drm] Please file a _new_ bug report on bugs.freedesktop.org
against DRI -> DRM/Intel
[19414.582578] [drm] drm/i915 developers can then reassign to the right
component if it's not a kernel issue.
[19414.582581] [drm] The gpu crash dump is required to analyze gpu hangs, so
please always attach it.
[19414.582583] [drm] GPU crash dump saved to /sys/class/drm/card0/error
[19414.585604] [drm] Simulated gpu hang, resetting stop_rings
[19414.585610] drm/i915: Resetting chip after gpu hang
[19426.892311] drv_hangman: executing
[19426.892526] drv_hangman: starting subtest error-state-capture-bsd
[19432.610176] [drm] stuck on bsd ring
[19432.618152] [drm] GPU HANG: ecode 1:0xfffffffe, in drv_hangman [9131],
reason: Ring hung, action: reset
[19432.618274] [drm:__vlv_force_wake_get [i915]] *ERROR* Timed out: waiting for
Render to ack.
[19432.620510] [drm] Simulated gpu hang, resetting stop_rings
[19432.620516] drm/i915: Resetting chip after gpu hang


==Reproduce steps==
---------------------------- 
1. ./drv_hangman --run-subtest error-state-capture-bsd

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