After running the system for a week:

Aug  6 10:46:15 vessel kernel: [313879.612598] nouveau 0000:01:00.0: fifo: 
SCHED_ERROR 0a [CTXSW_TIMEOUT]
Aug  6 10:46:15 vessel kernel: [313879.612608] nouveau 0000:01:00.0: fifo: gr 
engine fault on channel 5, recovering...
Aug  6 10:46:15 vessel kernel: [313879.612853] nouveau 0000:01:00.0: fifo: 
PBDMA0: 01000000 [] ch 5 [007f337000 systemd-logind[580]] subc 0 mthd 0ff4 data 
02c90000
Aug  6 10:46:15 vessel kernel: [313879.612870] nouveau 0000:01:00.0: fifo: 
PBDMA0: 01000000 [] ch 5 [007f337000 systemd-logind[580]] subc 0 mthd 0ff8 data 
03620000

Debian Stretch

Linux vessel 4.9.0-3-amd64 #1 SMP Debian 4.9.30-2+deb9u2 (2017-06-26)
x86_64 GNU/Linux

GNOME Shell 3.22.3

Wayland Session

[   859.763] (II) LoadModule: "nouveau"
[   859.763] (II) Loading /usr/lib/xorg/modules/drivers/nouveau_drv.so
[   859.763] (II) Module nouveau: vendor="X.Org Foundation"
[   859.764] (II) [drm] nouveau interface version: 1.3.1
[   859.764] (II) [drm] nouveau interface version: 1.3.1
[   860.188] (II) NOUVEAU(0): [DRI2]   DRI driver: nouveau
[   860.188] (II) NOUVEAU(0): [DRI2]   VDPAU driver: nouveau
[   860.206] (II) NOUVEAU(1): [DRI2]   DRI driver: nouveau
[   860.206] (II) NOUVEAU(1): [DRI2]   VDPAU driver: nouveau
[   860.263] (II) AIGLX: Loaded and initialized nouveau
[   860.285] (II) AIGLX: Loaded and initialized nouveau

-- 
You received this bug notification because you are a member of Ubuntu-X,
which is subscribed to xserver-xorg-video-nouveau in Ubuntu.
https://bugs.launchpad.net/bugs/1661486

Title:
  nouveau write fault, CTXSW_TIMEOUT, hangs the display

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-nouveau/+bug/1661486/+subscriptions

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