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

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You received this bug notification because you are a member of Desktop
Packages, 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

Status in xserver-xorg-video-nouveau package in Ubuntu:
  Confirmed

Bug description:
  A few hours after upgrading to the latest kernel and plasma (using apt
  upgrade) in Xenial 16.04LTS, my computer display hung with:

  Feb  2 20:36:16 snorkack kernel: [83600.290217] nouveau 0000:01:00.0: fifo: 
write fault at 000027c000 engine 00 [GR] client 0e [GPC0/GPCCS] reason 02 [PTE] 
on channel 2 [007f9a3000 Xorg[1501]]
  Feb  2 20:36:16 snorkack kernel: [83600.290221] nouveau 0000:01:00.0: fifo: 
gr engine fault on channel 2, recovering...
  Feb  2 20:33:42 snorkack colord[1394]: (colord:1394): Cd-WARNING **: failed 
to get session [pid 27934]: No such device or address
  Feb  2 20:36:19 snorkack vmnet-dhcpd: DHCPREQUEST for 192.168.50.128 from 
00:0c:29:d5:2d:15 via vmnet8
  Feb  2 20:36:19 snorkack vmnet-dhcpd: DHCPACK on 192.168.50.128 to 
00:0c:29:d5:2d:15 via vmnet8
  Feb  2 20:36:20 snorkack kernel: [83604.585547] nouveau 0000:01:00.0: fifo: 
SCHED_ERROR 0a [CTXSW_TIMEOUT]
  Feb  2 20:36:20 snorkack kernel: [83604.585553] nouveau 0000:01:00.0: fifo: 
sw engine fault on channel 8, recovering...
  Feb  2 20:36:22 snorkack kernel: [83606.583732] nouveau 0000:01:00.0: fifo: 
runlist 0 update timeout
  Feb  2 20:36:24 snorkack kernel: [83608.880576] nouveau 0000:01:00.0: fifo: 
SCHED_ERROR 0a [CTXSW_TIMEOUT]
  Feb  2 20:36:29 snorkack kernel: [83613.175601] nouveau 0000:01:00.0: fifo: 
SCHED_ERROR 0a [CTXSW_TIMEOUT]
  Feb  2 20:36:33 snorkack kernel: [83617.470624] nouveau 0000:01:00.0: fifo: 
SCHED_ERROR 0a [CTXSW_TIMEOUT]
  Feb  2 20:36:37 snorkack kernel: [83621.765648] nouveau 0000:01:00.0: fifo: 
SCHED_ERROR 0a [CTXSW_TIMEOUT]
  Feb  2 20:36:42 snorkack kernel: [83626.060672] nouveau 0000:01:00.0: fifo: 
SCHED_ERROR 0a [CTXSW_TIMEOUT]
  ...repeats many times...

  I could still log in via SSH but could not unhang the system, so I
  rebooted.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: xserver-xorg-video-nouveau 1:1.0.12-1build2
  ProcVersionSignature: Ubuntu 4.4.0-62.83-generic 4.4.40
  Uname: Linux 4.4.0-62-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.5
  Architecture: amd64
  CurrentDesktop: KDE
  Date: Thu Feb  2 23:20:22 2017
  InstallationDate: Installed on 2016-09-25 (131 days ago)
  InstallationMedia: Kubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 
(20160719)
  SourcePackage: xserver-xorg-video-nouveau
  UpgradeStatus: No upgrade log present (probably fresh install)

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