Hello,

On a up to date Debian Testing machine I am having issues with the xserver freezing then crashing.

Here are hopefully all the relevant versions:
ii  x11-xserver-utils                     7.7+7+b1                              amd64        X server utilities
ii  xserver-common                        2:1.19.2-1                            all          common files used by various X servers
ii  xserver-xephyr                        2:1.19.2-1                            amd64        nested X server
ii  xserver-xorg                          1:7.7+18                              amd64        X.Org X server
ii  xserver-xorg-core                     2:1.19.2-1                            amd64        Xorg X server - core server
ii  xserver-xorg-input-all                1:7.7+18                              amd64        X.Org X server -- input driver metapackage
ii  xserver-xorg-input-evdev              1:2.10.5-1                            amd64        X.Org X server -- evdev input driver
ii  xserver-xorg-input-libinput           0.23.0-2                              amd64        X.Org X server -- libinput input driver
ii  xserver-xorg-input-mouse              1:1.9.2-1+b1                          amd64        X.Org X server -- mouse input driver
ii  xserver-xorg-input-synaptics          1.9.0-1+b1                            amd64        Synaptics TouchPad driver for X.Org server
ii  xserver-xorg-input-wacom              0.34.0-1                              amd64        X.Org X server -- Wacom input driver
ii  xserver-xorg-legacy                   2:1.19.2-1                            amd64        setuid root Xorg server wrapper
ii  xserver-xorg-video-all                1:7.7+18                              amd64        X.Org X server -- output driver metapackage
ii  xserver-xorg-video-amdgpu             1.2.0-1+b1                            amd64        X.Org X server -- AMDGPU display driver
ii  xserver-xorg-video-ati                1:7.8.0-1+b1                          amd64        X.Org X server -- AMD/ATI display driver wrapper
ii  xserver-xorg-video-cirrus             1:1.5.3-1+b2                          amd64        X.Org X server -- Cirrus display driver
ii  xserver-xorg-video-fbdev              1:0.4.4-1+b5                          amd64        X.Org X server -- fbdev display driver
ii  xserver-xorg-video-intel              2:2.99.917+git20161206-1              amd64        X.Org X server -- Intel i8xx, i9xx display driver
ii  xserver-xorg-video-mach64             6.9.5-1+b2                            amd64        X.Org X server -- ATI Mach64 display driver
ii  xserver-xorg-video-mga                1:1.6.5-1                             amd64        X.Org X server -- MGA display driver
ii  xserver-xorg-video-neomagic           1:1.2.9-1+b2                          amd64        X.Org X server -- Neomagic display driver
ii  xserver-xorg-video-nouveau            1:1.0.13-2                            amd64        X.Org X server -- Nouveau display driver
ii  xserver-xorg-video-openchrome         1:0.5.0-3                             amd64        X.Org X server -- VIA display driver
ii  xserver-xorg-video-qxl                0.1.4+20161126git4d7160c-1            amd64        X.Org X server -- QXL display driver
ii  xserver-xorg-video-r128               6.10.2-1                              amd64        X.Org X server -- ATI r128 display driver
ii  xserver-xorg-video-radeon             1:7.8.0-1+b1                          amd64        X.Org X server -- AMD/ATI Radeon display driver
ii  xserver-xorg-video-savage             1:2.3.9-1                             amd64        X.Org X server -- Savage display driver
ii  xserver-xorg-video-siliconmotion      1:1.7.9-2                             amd64        X.Org X server -- SiliconMotion display driver
ii  xserver-xorg-video-sisusb             1:0.9.7-1                             amd64        X.Org X server -- SiS USB display driver
ii  xserver-xorg-video-tdfx               1:1.4.7-1                             amd64        X.Org X server -- tdfx display driver
ii  xserver-xorg-video-trident            1:1.3.8-1                             amd64        X.Org X server -- Trident display driver
ii  xserver-xorg-video-vesa               1:2.3.4-1+b2                          amd64        X.Org X server -- VESA display driver
ii  xserver-xorg-video-vmware             1:13.2.1-1+b1                         amd64        X.Org X server -- VMware display driver


The messages log tells me to make a bug report here so I am doing so.

Apr 10 12:32:14 bluesky kernel: [179113.599612] [drm] GPU HANG: ecode 9:0:0x85dffffb, in Xorg [2253], reason: Hang on render ring, action: reset
Apr 10 12:32:14 bluesky kernel: [179113.599615] [drm] GPU hangs can indicate a bug anywhere in the entire gfx stack, including userspace.
Apr 10 12:32:14 bluesky kernel: [179113.599616] [drm] Please file a _new_ bug report on bugs.freedesktop.org against DRI -> DRM/Intel
Apr 10 12:32:14 bluesky kernel: [179113.599617] [drm] drm/i915 developers can then reassign to the right component if it's not a kernel issue.
Apr 10 12:32:14 bluesky kernel: [179113.599618] [drm] The gpu crash dump is required to analyze gpu hangs, so please always attach it.
Apr 10 12:32:14 bluesky kernel: [179113.599620] [drm] GPU crash dump saved to /sys/class/drm/card0/error
Apr 10 12:32:14 bluesky kernel: [179113.599665] drm/i915: Resetting chip after gpu hang
Apr 10 12:32:14 bluesky kernel: [179113.599729] [drm] RC6 on
Apr 10 12:32:14 bluesky kernel: [179113.613306] [drm] GuC firmware load skipped
Apr 10 12:32:25 bluesky kernel: [179124.607082] drm/i915: Resetting chip after gpu hang
Apr 10 12:32:25 bluesky kernel: [179124.607146] [drm] RC6 on
Apr 10 12:32:25 bluesky kernel: [179124.621291] [drm] GuC firmware load skipped

Unfortunately the box in question has gotten rebooted since the issue so now the crash dump is missing.  I will try and capture one next time this happens.  Anything else I can do in the meantime to debug this?