Impossible to tie it down to upgrade or specific action or app at this
point, been happening unpredictably over last month or so, it could be
related to recent requirement to use Skype/VCC for work....I'll try
installing the latest upstream mainline and see how it goes and let you
know. May take while as I can't reliably reproduce the issue, usually
seems to happen during computer idle time mid work session....

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https://bugs.launchpad.net/bugs/1785480

Title:
  Xorg freeze (kernel general protection fault: 0000 [#1] SMP)

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  Stack trace from last freeze:

  ~$ cat /var/log/kern.log|grep "5 15:1"
  Aug  5 15:15:45 GA-MA785GMT-UD2H kernel: [54412.878703] general protection 
fault: 0000 [#1] SMP 
  Aug  5 15:15:45 GA-MA785GMT-UD2H kernel: [54412.878740] Modules linked in: 
pci_stub vboxpci(OE) vboxnetadp(OE) vboxnetflt(OE) vboxdrv(OE) snd_usb_audio 
snd_hda_codec_realtek snd_hda_codec_generic snd_hda_codec_hdmi snd_usbmidi_lib 
snd_hda_intel snd_hda_codec snd_hda_core snd_hwdep snd_pcm joydev snd_seq_midi 
snd_seq_midi_event snd_rawmidi kvm_amd kvm snd_seq irqbypass snd_seq_device 
snd_timer snd input_leds k10temp serio_raw edac_mce_amd edac_core i2c_piix4 
soundcore shpchp 8250_fintek mac_hid parport_pc ppdev lp parport autofs4 
hid_generic hid_logitech_hidpp pata_acpi hid_logitech_dj usbhid hid uas 
usb_storage amdkfd amd_iommu_v2 radeon i2c_algo_bit ttm drm_kms_helper 
syscopyarea sysfillrect sysimgblt fb_sys_fops r8169 firewire_ohci drm 
firewire_core mii pata_atiixp crc_itu_t ahci libahci wmi fjes
  Aug  5 15:15:45 GA-MA785GMT-UD2H kernel: [54412.879121] CPU: 2 PID: 14839 
Comm: MemoryInfra Tainted: G           OE   4.4.0-131-generic #157-Ubuntu
  Aug  5 15:15:45 GA-MA785GMT-UD2H kernel: [54412.879163] Hardware name: 
Gigabyte Technology Co., Ltd. GA-MA785GMT-UD2H/GA-MA785GMT-UD2H, BIOS F1 
07/03/2009
  Aug  5 15:15:45 GA-MA785GMT-UD2H kernel: [54412.879207] task: 
ffff88022143a640 ti: ffff88006499c000 task.ti: ffff88006499c000
  Aug  5 15:15:45 GA-MA785GMT-UD2H kernel: [54412.879240] RIP: 
0010:[<ffffffff81193d84>]  [<ffffffff81193d84>] find_get_entry+0x34/0xa0
  Aug  5 15:15:45 GA-MA785GMT-UD2H kernel: [54412.879280] RSP: 
0018:ffff88006499fd78  EFLAGS: 00010246
  Aug  5 15:15:45 GA-MA785GMT-UD2H kernel: [54412.879304] RAX: ffff8800603c5c28 
RBX: ffff880069a27508 RCX: 00000000fffffffa
  Aug  5 15:15:45 GA-MA785GMT-UD2H kernel: [54412.879335] RDX: 0000000000000000 
RSI: ffff8800603c5c28 RDI: f7ffea000763c880
  Aug  5 15:15:45 GA-MA785GMT-UD2H kernel: [54412.879367] RBP: ffff88006499fd88 
R08: 0000000000000000 R09: ffff8800603c5b60
  Aug  5 15:15:45 GA-MA785GMT-UD2H kernel: [54412.879398] R10: ffff88006499fd58 
R11: 00007f44a30bf000 R12: 0000000000000314
  Aug  5 15:15:45 GA-MA785GMT-UD2H kernel: [54412.879429] R13: 0000000000000200 
R14: ffff8801477fe000 R15: 00000000000001d4
  Aug  5 15:15:45 GA-MA785GMT-UD2H kernel: [54412.879461] FS:  
00007f44b1e86700(0000) GS:ffff88022fd00000(0000) knlGS:0000000000000000
  Aug  5 15:15:45 GA-MA785GMT-UD2H kernel: [54412.879496] CS:  0010 DS: 0000 
ES: 0000 CR0: 0000000080050033
  Aug  5 15:15:45 GA-MA785GMT-UD2H kernel: [54412.879522] CR2: 0000163c8d2cc000 
CR3: 000000001a6a5000 CR4: 00000000000006f0
  Aug  5 15:15:45 GA-MA785GMT-UD2H kernel: [54412.879554] Stack:
  Aug  5 15:15:45 GA-MA785GMT-UD2H kernel: [54412.879564]  ffff880069a27500 
0000000000000314 ffff88006499fda8 ffffffff811c9ed6
  Aug  5 15:15:45 GA-MA785GMT-UD2H kernel: [54412.879600]  ffff8801c0071314 
0000000000000315 ffff88006499fde8 ffffffff811c9fce
  Aug  5 15:15:45 GA-MA785GMT-UD2H kernel: [54412.879637]  ffff8801c0071141 
ffff88006499fed8 00007f44a34c0000 ffff880176f208c8
  Aug  5 15:15:45 GA-MA785GMT-UD2H kernel: [54412.879674] Call Trace:
  Aug  5 15:15:45 GA-MA785GMT-UD2H kernel: [54412.879690]  [<ffffffff811c9ed6>] 
mincore_page+0x26/0xa0
  Aug  5 15:15:45 GA-MA785GMT-UD2H kernel: [54412.879715]  [<ffffffff811c9fce>] 
__mincore_unmapped_range+0x7e/0xd0
  Aug  5 15:15:45 GA-MA785GMT-UD2H kernel: [54412.879744]  [<ffffffff811ca03a>] 
mincore_unmapped_range+0x1a/0x30
  Aug  5 15:15:45 GA-MA785GMT-UD2H kernel: [54412.880836]  [<ffffffff811d7a7b>] 
__walk_page_range+0x32b/0x4d0
  Aug  5 15:15:45 GA-MA785GMT-UD2H kernel: [54412.881903]  [<ffffffff811d7c85>] 
walk_page_range+0x65/0xe0
  Aug  5 15:15:45 GA-MA785GMT-UD2H kernel: [54412.882987]  [<ffffffff811ca4b8>] 
SyS_mincore+0x1b8/0x250
  Aug  5 15:15:45 GA-MA785GMT-UD2H kernel: [54412.884059]  [<ffffffff811ca050>] 
? mincore_unmapped_range+0x30/0x30
  Aug  5 15:15:45 GA-MA785GMT-UD2H kernel: [54412.885144]  [<ffffffff811ca020>] 
? __mincore_unmapped_range+0xd0/0xd0
  Aug  5 15:15:45 GA-MA785GMT-UD2H kernel: [54412.886256]  [<ffffffff811c9e70>] 
? copy_user_huge_page+0x300/0x300
  Aug  5 15:15:45 GA-MA785GMT-UD2H kernel: [54412.887379]  [<ffffffff8185328e>] 
entry_SYSCALL_64_fastpath+0x22/0xc1
  Aug  5 15:15:45 GA-MA785GMT-UD2H kernel: [54412.888534] Code: 41 54 53 48 8d 
5f 08 49 89 f4 4c 89 e6 48 89 df e8 d2 3b 27 00 48 85 c0 48 89 c6 74 36 48 8b 
38 48 85 ff 74 2e 40 f6 c7 03 75 52 <8b> 4f 1c 85 c9 74 d8 8d 51 01 4c 8d 47 1c 
89 c8 f0 0f b1 57 1c 
  Aug  5 15:15:45 GA-MA785GMT-UD2H kernel: [54412.891139] RIP  
[<ffffffff81193d84>] find_get_entry+0x34/0xa0
  Aug  5 15:15:45 GA-MA785GMT-UD2H kernel: [54412.892411]  RSP 
<ffff88006499fd78>
  Aug  5 15:15:45 GA-MA785GMT-UD2H kernel: [54412.900856] ---[ end trace 
ce67797724b8bad6 ]---


  Happens when not doing anything, return to find frozen or freezing
  windows (last case Google Chrome was greyed out, then Terminal became
  unresponsive and finally whole session, no response from Caps Lock so
  hard reset performed.

  I would expect it's one of the following:
  Google Chrome plugin (need to use for work)
  Skype (from Microsoft Skype directly, not Snap which caused issues 
immediately!)
  Virtual Call Centre - deb package direct from source https://vcc.live/

  I have no way to know whether any of the above caused this issue or
  whether it's compositing desktop demons at play, so if anyone can
  interpret the above, I can chase up with any 3rd party as required
  (presuming there is no Ubuntu/kernel/X problem at play here)

  If more info needed I am happy to provide.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: xorg 1:7.7+13ubuntu3
  ProcVersionSignature: Ubuntu 4.4.0-131.157-generic 4.4.134
  Uname: Linux 4.4.0-131-generic x86_64
  .tmp.unity_support_test.0:
   
  ApportVersion: 2.20.1-0ubuntu2.18
  Architecture: amd64
  CompizPlugins: No value set for 
`/apps/compiz-1/general/screen0/options/active_plugins'
  CompositorRunning: compiz
  CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
  CompositorUnredirectFSW: true
  CurrentDesktop: Unity
  Date: Sun Aug  5 15:31:07 2018
  DistUpgraded: Fresh install
  DistroCodename: xenial
  DistroVariant: ubuntu
  ExtraDebuggingInterest: Yes
  GpuHangFrequency: Several times a week
  GpuHangReproducibility: Seems to happen randomly
  GpuHangStarted: Within the last week or two
  GraphicsCard:
   Advanced Micro Devices, Inc. [AMD/ATI] RS880 [Radeon HD 4200] [1002:9710] 
(prog-if 00 [VGA controller])
     Subsystem: Gigabyte Technology Co., Ltd RS880 [Radeon HD 4200] [1458:d000]
  InstallationDate: Installed on 2016-11-07 (636 days ago)
  InstallationMedia: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 
(20160719)
  MachineType: Gigabyte Technology Co., Ltd. GA-MA785GMT-UD2H
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-131-generic 
root=UUID=9341fe7b-f0ee-48ca-8563-4d124305346a ro persistent quiet splash 
vt.handoff=7
  SourcePackage: xorg
  Symptom: display
  Title: Xorg freeze
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 07/03/2009
  dmi.bios.vendor: Award Software International, Inc.
  dmi.bios.version: F1
  dmi.board.name: GA-MA785GMT-UD2H
  dmi.board.vendor: Gigabyte Technology Co., Ltd.
  dmi.board.version: x.x
  dmi.chassis.type: 3
  dmi.chassis.vendor: Gigabyte Technology Co., Ltd.
  dmi.modalias: 
dmi:bvnAwardSoftwareInternational,Inc.:bvrF1:bd07/03/2009:svnGigabyteTechnologyCo.,Ltd.:pnGA-MA785GMT-UD2H:pvr:rvnGigabyteTechnologyCo.,Ltd.:rnGA-MA785GMT-UD2H:rvrx.x:cvnGigabyteTechnologyCo.,Ltd.:ct3:cvr:
  dmi.product.name: GA-MA785GMT-UD2H
  dmi.sys.vendor: Gigabyte Technology Co., Ltd.
  version.compiz: compiz 1:0.9.12.3+16.04.20180221-0ubuntu1
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.91-2~16.04.1
  version.libgl1-mesa-dri: libgl1-mesa-dri 18.0.5-0ubuntu0~16.04.1
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 18.0.5-0ubuntu0~16.04.1
  version.xserver-xorg-core: xserver-xorg-core 2:1.18.4-0ubuntu0.7
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.10.1-1ubuntu2
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.7.0-1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 
2:2.99.917+git20160325-1ubuntu1.2
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 
1:1.0.12-1build2
  xserver.bootTime: Sun Aug  5 15:20:46 2018
  xserver.configfile: default
  xserver.errors:
   
  xserver.logfile: /var/log/Xorg.0.log
  xserver.version: 2:1.18.4-0ubuntu0.7
  xserver.video_driver: radeon

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