nouveau driver display garbled after clicking ubuntu search menu button

[Girish Chandra M]

Display garbled after clicking ubuntu search menu button when using Nvidia Display driver "nouveau".
Encountered this multiple times but doesn't happen all the time, frequency is once in 50.
The messages look like this:

May 13 12:01:32 Gilli-Desk kernel: [1213168.193257] nouveau 0000:02:00.0: compiz[2374]: fail ttm_validate
May 13 12:01:32 Gilli-Desk kernel: [1213168.193264] nouveau 0000:02:00.0: compiz[2374]: validating bo list
May 13 12:01:32 Gilli-Desk kernel: [1213168.193293] nouveau 0000:02:00.0: compiz[2374]: validate: -12
May 13 12:01:32 Gilli-Desk kernel: [1213168.353666] nouveau 0000:02:00.0: gr: TRAP_PROP - TP 1 - 00000040 [RT_FAULT] - Address 004c631600
May 13 12:01:32 Gilli-Desk kernel: [1213168.353675] nouveau 0000:02:00.0: gr: TRAP_PROP - TP 1 - e0c: 00000000, e18: 00000000, e1c: 00180018, e20: 00001100, e24: 00030000
May 13 12:01:32 Gilli-Desk kernel: [1213168.353681] nouveau 0000:02:00.0: gr: 00200000 [] ch 4 [000f945000 compiz[2374]] subc 3 class 8297 mthd 1b0c data 1000f010
May 13 12:01:32 Gilli-Desk kernel: [1213168.353693] nouveau 0000:02:00.0: fb: trapped write at 004c631600 on channel 4 [0f945000 compiz[2374]] engine 00 [PGRAPH] client 0b [PROP] subclient 00 [RT0] reason 00000002 [PAGE_NOT_PRESENT]
May 13 12:01:32 Gilli-Desk kernel: [1213168.353721] nouveau 0000:02:00.0: gr: TRAP_PROP - TP 1 - 00000040 [RT_FAULT] - Address 004c64b700
May 13 12:01:32 Gilli-Desk kernel: [1213168.353726] nouveau 0000:02:00.0: gr: TRAP_PROP - TP 1 - e0c: 00000000, e18: 00000000, e1c: 001e01b8, e20: 00001100, e24: 00030000
May 13 12:01:32 Gilli-Desk kernel: [1213168.353734] nouveau 0000:02:00.0: gr: 00200000 [] ch 4 [000f945000 compiz[2374]] subc 3 class 8297 mthd 1b0c data 1000f010
May 13 12:01:32 Gilli-Desk kernel: [1213168.353746] nouveau 0000:02:00.0: fb: trapped write at 004c655700 on channel 4 [0f945000 compiz[2374]] engine 00 [PGRAPH] client 0b [PROP] subclient 00 [RT0] reason 00000002 [PAGE_NOT_PRESENT]

...

May 13 12:01:50 Gilli-Desk kernel: [1213186.038077] nouveau 0000:02:00.0: gr: magic set 1:
May 13 12:01:50 Gilli-Desk kernel: [1213186.038083] nouveau 0000:02:00.0: gr: 00409904: 20082c0a
May 13 12:01:50 Gilli-Desk kernel: [1213186.038086] nouveau 0000:02:00.0: gr: 00409908: 004523bc
May 13 12:01:50 Gilli-Desk kernel: [1213186.038090] nouveau 0000:02:00.0: gr: 0040990c: 40000430
May 13 12:01:50 Gilli-Desk kernel: [1213186.038094] nouveau 0000:02:00.0: gr: 00409910: c5000000
May 13 12:01:50 Gilli-Desk kernel: [1213186.038098] nouveau 0000:02:00.0: gr: TRAP_TEXTURE - TP1: 00000003 [ FAULT]
May 13 12:01:50 Gilli-Desk kernel: [1213186.038104] nouveau 0000:02:00.0: gr: 00200000 [] ch 4 [000f945000 compiz[2374]] subc 3 class 8297 mthd 1b0c data 1000f010
May 13 12:01:50 Gilli-Desk kernel: [1213186.038115] nouveau 0000:02:00.0: fb: trapped write at 0054294500 on channel 4 [0f945000 compiz[2374]] engine 00 [PGRAPH] client 0b [PROP] subclient 00 [RT0] reason 00000002 [PAGE_NOT_PRESENT]

1. lsb_release -rd
Description: Ubuntu 16.04.5 LTS
Release: 16.04

2. driver version:
modinfo nouveau
filename: /lib/modules/4.4.0-135-generic/kernel/drivers/gpu/drm/nouveau/nouveau.ko
license: GPL and additional rights
description: nVidia Riva/TNT/GeForce/Quadro/Tesla
author: Nouveau Project
srcversion: 19664B0B91875571D18F94A
alias: pci:v000012D2d*sv*sd*bc03sc*i*
alias: pci:v000010DEd*sv*sd*bc03sc*i*
depends: drm,drm_kms_helper,ttm,mxm-wmi,wmi,video,i2c-algo-bit
retpoline: Y
intree: Y
vermagic: 4.4.0-135-generic SMP mod_unload modversions retpoline
parm: tv_norm:Default TV norm.
  Supported: PAL, PAL-M, PAL-N, PAL-Nc, NTSC-M, NTSC-J,
   hd480i, hd480p, hd576i, hd576p, hd720p, hd1080i.
  Default: PAL
  *NOTE* Ignored for cards with external TV encoders. (charp)
parm: vram_pushbuf:Create DMA push buffers in VRAM (int)
parm: nofbaccel:Disable fbcon acceleration (int)
parm: tv_disable:Disable TV-out detection (int)
parm: ignorelid:Ignore ACPI lid status (int)
parm: duallink:Allow dual-link TMDS (default: enabled) (int)
parm: pstate:enable sysfs pstate file, which will be moved in the future (int)
parm: config:option string to pass to driver core (charp)
parm: debug:debug string to pass to driver core (charp)
parm: noaccel:disable kernel/abi16 acceleration (int)
parm: modeset:enable driver (default: auto, 0 = disabled, 1 = enabled, 2 = headless) (int)
parm: runpm:disable (0), force enable (1), optimus only default (-1) (int)

3. expect to launch the ubuntu search when clicked on ubuntu search menu or button.

4. threw garbled display instead.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[enriquedominguez (g119129be)]

I have a very similar issue. Same ubuntu version 16.04, fresh install.
Using Nvidia driver strange colours appear.
Using xorg driver after clicking ubuntu search menu the system completely freezes. Must reboot after that.
This is what I see in syslog (dossier /var/log) at time of issue:

May 1 19:17:33 aaa-desktop kernel: [ 2056.950500] nouveau 0000:01:00.0: compiz[1918]: fail ttm_validate
May 1 19:17:33 aaa-desktop kernel: [ 2056.950508] nouveau 0000:01:00.0: compiz[1918]: validating bo list
May 1 19:17:33 aaa-desktop kernel: [ 2056.950529] nouveau 0000:01:00.0: compiz[1918]: validate: -12
May 1 19:17:33 aaa-desktop kernel: [ 2057.344081] nouveau 0000:01:00.0: compiz[1918]: fail ttm_validate
May 1 19:17:33 aaa-desktop kernel: [ 2057.344089] nouveau 0000:01:00.0: compiz[1918]: validating bo list
May 1 19:17:33 aaa-desktop kernel: [ 2057.344106] nouveau 0000:01:00.0: compiz[1918]: validate: -12
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