[Bug 106443] New: [drm] GPU HANG: ecode 9:0:0x859ffffb, in Xorg [2092], reason: hang on rcs0, action: reset

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=106443

            Bug ID: 106443
           Summary: [drm] GPU HANG: ecode 9:0:0x859ffffb, in Xorg [2092],
                    reason: hang on rcs0, action: reset
           Product: DRI
           Version: XOrg git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: simeon.miteff at gmail.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 139429
  --> https://bugs.freedesktop.org/attachment.cgi?id=139429&action=edit
GPU crash dump

I get GPU hangs on Sky Lake integrated graphics when not booting with either:

i915.modeset=0 
or
video=vesafb:off

The hardware is a Dell 7040 with Intel i7-6700 CPU.

Xorg does not crash, but everything except the cursor locks up each time the
GPU resets. Here his the drm message:

[   41.823218] [drm] GPU HANG: ecode 9:0:0x859ffffb, in Xorg [2092], reason:
hang on rcs0, action: reset
[   41.823219] [drm] GPU hangs can indicate a bug anywhere in the entire gfx
stack, including userspace.
[   41.823220] [drm] Please file a _new_ bug report on bugs.freedesktop.org
against DRI -> DRM/Intel
[   41.823220] [drm] drm/i915 developers can then reassign to the right
component if it's not a kernel issue.
[   41.823220] [drm] The gpu crash dump is required to analyze gpu hangs, so
please always attach it.
[   41.823221] [drm] GPU crash dump saved to /sys/class/drm/card0/error

Subsequent to this there are frequent repeated resets:

[   92.731613] i915 0000:00:02.0: Resetting rcs0 for hang on rcs0
[  100.731570] i915 0000:00:02.0: Resetting rcs0 for hang on rcs0
[  108.731500] i915 0000:00:02.0: Resetting rcs0 for hang on rcs0
[  116.731410] i915 0000:00:02.0: Resetting rcs0 for hang on rcs0
[  606.840675] i915 0000:00:02.0: Resetting rcs0 for hang on rcs0
[  617.816522] i915 0000:00:02.0: Resetting rcs0 for hang on rcs0
[  625.816467] i915 0000:00:02.0: Resetting rcs0 for hang on rcs0
[  633.816354] i915 0000:00:02.0: Resetting rcs0 for hang on rcs0

Kernel: 4.17.0
Xorg server: 1.19.6
Intel driver: 2.99.917+git20171229-1
Mesa: 18.0.0
GuC firmware: i915/skl_guc_ver9_33.bin
HuC firmware: i915/skl_huc_ver01_07_1398.bin

I started out with a stock Ubuntu Xenial and progressively upgraded bits with
no avail. Turning off modeset/vesafb was an acceptable solution until I needed
dual display support.

GPU crash dump is attached

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