Created attachment 130395 [details]
card0/error message as bz2

> [533045.170811] [drm] GPU HANG: ecode 9:0:0x85dffffb, in Xorg [1128], reason: Hang on render ring, action: reset
> [533045.170815] [drm] GPU hangs can indicate a bug anywhere in the entire gfx > stack, including userspace.
> [533045.170817] [drm] Please file a _new_ bug report on bugs.freedesktop.org against DRI -> DRM/Intel
> [533045.170819] [drm] drm/i915 developers can then reassign to the right component if it's not a kernel issue.
> [533045.170821] [drm] The gpu crash dump is required to analyze gpu hangs, so please always attach it.
> [533045.170823] [drm] GPU crash dump saved to /sys/class/drm/card0/error
> [533045.170977] drm/i915: Resetting chip after gpu hang
> [533045.171078] [drm] RC6 on
> [533045.183339] [drm] GuC firmware load skipped
> [533056.145798] drm/i915: Resetting chip after gpu hang
> [533056.145843] [drm] RC6 on
> [533056.159879] [drm] GuC firmware load skipped
> [533056.259591] xftwidth[30178]: segfault at 968 ip 00007fbd59c32d04 sp 00007ffd2b62ff50 error 4 in libX11.so.6.3.0[7fbd59c06000+13a000]

% uname -m
x86_64

% uname -a
Linux $hostname 4.9.0-2-amd64 #1 SMP Debian 4.9.13-1 (2017-02-27) x86_64 GNU/Linux

% lspci
00:00.0 Host bridge: Intel Corporation Skylake Host Bridge/DRAM Registers (rev 08)
00:02.0 VGA compatible controller: Intel Corporation HD Graphics 520 (rev 07)
00:14.0 USB controller: Intel Corporation Sunrise Point-LP USB 3.0 xHCI Controller (rev 21)
00:14.2 Signal processing controller: Intel Corporation Sunrise Point-LP Thermal subsystem (rev 21)
00:16.0 Communication controller: Intel Corporation Sunrise Point-LP CSME HECI #1 (rev 21)
00:17.0 SATA controller: Intel Corporation Sunrise Point-LP SATA Controller [AHCI mode] (rev 21)
00:1c.0 PCI bridge: Intel Corporation Device 9d10 (rev f1)
00:1c.2 PCI bridge: Intel Corporation Device 9d12 (rev f1)
00:1f.0 ISA bridge: Intel Corporation Sunrise Point-LP LPC Controller (rev 21)
00:1f.2 Memory controller: Intel Corporation Sunrise Point-LP PMC (rev 21)
00:1f.3 Audio device: Intel Corporation Sunrise Point-LP HD Audio (rev 21)
00:1f.4 SMBus: Intel Corporation Sunrise Point-LP SMBus (rev 21)
00:1f.6 Ethernet controller: Intel Corporation Ethernet Connection I219-V (rev 21)
02:00.0 Unassigned class [ff00]: Realtek Semiconductor Co., Ltd. RTS522A PCI Express Card Reader (rev 01)
04:00.0 Network controller: Intel Corporation Wireless 8260 (rev 3a)

This is Debian stretch running on an Lenovo X260. I am sadly not sure what exactly triggered this, as I didn't do anything out of the ordinary in my coding session (tmux, zsh, emacs & npd/ncmpc).