[Bug 86189] [BSW]igt/drv_missed_irq_hang sporadically causes *ERROR* pipe B underrun

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=86189

--- Comment #1 from lu hua <huax.lu at intel.com> ---
drv_hangman also sporadically causes this error.
@test: Intel_gpu_tools/igt_drv_hangman_error-state-capture-blt
returncode: 0
info: @@@Returncode: 0

test case start at: Sun Jan 18 07:40:10 2015
test case end at:   Sun Jan 18 07:40:39 2015

Errors:


Dmesg:
<3>[   89.783289] [drm:valleyview_pipestat_irq_handler [i915]] *ERROR* CPU pipe
B FIFO underrun
<6>[   91.783839] [drm] stuck on blitter ring
<6>[   91.815444] [drm] GPU HANG: ecode 8:2:0xfffffffe, in drv_hangman [5231],
reason: Ring hung, action: reset
<6>[   91.815458] [drm] GPU hangs can indicate a bug anywhere in the entire gfx
stack, including userspace.
<6>[   91.815462] [drm] Please file a _new_ bug report on bugs.freedesktop.org
against DRI -> DRM/Intel
<6>[   91.815464] [drm] drm/i915 developers can then reassign to the right
component if it's not a kernel issue.
<6>[   91.815467] [drm] The gpu crash dump is required to analyze gpu hangs, so
please always attach it.
<6>[   91.815470] [drm] GPU crash dump saved to /sys/class/drm/card0/error
<6>[   91.817453] [drm] Simulated gpu hang, resetting stop_rings
<5>[   91.817457] drm/i915: Resetting chip after gpu hang

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