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

[Andy Stable]

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

[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

This change was made by a bot.

[Joseph Salisbury (jsalisbury)]

Did this issue start happening after an update/upgrade? Was there a prior kernel version where you were not having this particular problem?

Would it be possible for you to test the latest upstream kernel? Refer to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest v4.18 kernel[0].

If this bug is fixed in the mainline kernel, please add the following tag 'kernel-fixed-upstream'.

If the mainline kernel does not fix this bug, please add the tag: 'kernel-bug-exists-upstream'.

Once testing of the upstream kernel is complete, please mark this bug as "Confirmed".

Thanks in advance.

[0] http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.18-rc8

[Andy Stable (acesabe)]

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....

[Andy Stable (acesabe)]

Done.
Latest linux-headers have dependency on libssl1.1 https://packages.ubuntu.com/bionic/amd64/libssl1.1/download whichis not available in 16.04 but no problem installing that manually. Now will wait and see if issue returns, may take a few days.

[Andy Stable (acesabe)]

Been running a few days on latest 4.18.0-041800rc8 and so far no crashes, so a tentative "fixed" might be appropriate now. Of course this message may be just the curse needed to replicate the issue! (I'll update if so)

I'm still none the wiser as to what might have been fixed or what caused the issue in the first place....

[Andy Stable (acesabe)]

Still no hangs/freezes/crashes in the last week so looks like issue either fixed in upstream kernel or was fixed in Skype/VCC!

uname -a
Linux GA-MA785GMT-UD2H 4.18.0-041800rc8-generic #201808052031 SMP Sun Aug 5 20:32:53 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux

I guess this could be marked "Fix released"

[Launchpad Janitor (janitor)]

[Expired for linux (Ubuntu) because there has been no activity for 60 days.]