[Bug 74100] [SNB Bisected]igt/gem_reset_stats/close-pending-fork-render causes system hang

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=74100

--- Comment #4 from Daniel Vetter <daniel at ffwll.ch> ---
Ok, I've cleaned up the superflous SKIP behaviour and some other stuff in the
testcase. And I can repro the issue here. Looking at netconsole the system
seems to go down with a failed gpu reset:

[   63.823960] [drm] stuck on render ring
[   63.824130] [drm] GPU crash dump saved to /sys/class/drm/card0/error
[   63.824847] [drm] GPU HANG [e77fffff]
[   63.824893] [drm] GPU hangs can indicate a bug anywhere in the entire gfx
stack, including userspace.
[   63.824979] [drm] Please file a _new_ bug report on bugs.freedesktop.org
against DRI -> DRM/Intel
[   63.825057] [drm] drm/i915 developers can then reassign to the right
component if it's not a kernel issue.
[   63.825138] [drm] The gpu crash dump is required to analyze gpu hangs, so
please always attach it.
[   63.825978] [drm] Simulated gpu hang, resetting stop_rings
[   65.805203] [drm] Enabling RC6 states: RC6 on, RC6p off, RC6pp off
[   71.812051] [drm] stuck on blitter ring
[   72.316616] [drm:i915_reset] *ERROR* Failed to reset chip: -110

That shouldn't really happen ...

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