Happened on wake from suspend. Using i915.enable_guc=-1. This seems to be a one off, I've been using 4.6.x for since mid-RC's with this same option. Suspend is suspend to RAM.

[ 1671.882574] [drm] GPU HANG: ecode 9:0:0xfffffffe, in gnome-shell [1238], reason: Hang on rcs0, action: reset
[ 1671.882575] [drm] GPU hangs can indicate a bug anywhere in the entire gfx stack, including userspace.
[ 1671.882575] [drm] Please file a _new_ bug report on bugs.freedesktop.org against DRI -> DRM/Intel
[ 1671.882576] [drm] drm/i915 developers can then reassign to the right component if it's not a kernel issue.
[ 1671.882576] [drm] The gpu crash dump is required to analyze gpu hangs, so please always attach it.
[ 1671.882576] [drm] GPU crash dump saved to /sys/class/drm/card0/error
[ 1671.882585] i915 0000:00:02.0: Resetting rcs0 after gpu hang
[ 1671.895810] [drm] INTEL_GUC_SEND: Action 0x3 failed; ret=-110 status=0x00000003 response=0x40000000
[ 1671.895853] i915 0000:00:02.0: Resetting chip after gpu hang
[ 1671.905276] [drm] HuC: Loaded firmware i915/skl_huc_ver01_07_1398.bin (version 1.7)
[ 1671.906733] [drm] GuC: Loaded firmware i915/skl_guc_ver9_33.bin (version 9.33)
[ 1671.906766] i915 0000:00:02.0: GuC firmware version 9.33
[ 1671.906767] i915 0000:00:02.0: GuC submission enabled
[ 1671.906769] i915 0000:00:02.0: HuC enabled


[    0.000000] DMI: HP HP Spectre Notebook/81A0, BIOS F.40 02/26/2018

00:02.0 VGA compatible controller [0300]: Intel Corporation Skylake GT2 [HD Graphics 520] [8086:1916] (rev 07) (prog-if 00 [VGA controller])
	Subsystem: Hewlett-Packard Company Device [103c:81a0]