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[Viktor Pal <1523444@xxxxxxxxxxxxxxxxxx>]

Crash happened again with following xorg output and also backtraces in dmesg:
[ 95404.681] (EE) Backtrace:
[ 95404.684] (EE) 0: /usr/bin/X (xorg_backtrace+0x4e) [0x55b5a491468e]
[ 95404.684] (EE) 1: /usr/bin/X (0x55b5a4760000+0x1b89f9) [0x55b5a49189f9]
[ 95404.684] (EE) 2: /lib/x86_64-linux-gnu/libc.so.6 (0x7f2a23bee000+0x352f0) [0x7f2a23c232f0]
[ 95404.684] (EE) 3: ?? [0x55b5a624bfc8]
[ 95404.684] (EE) 
[ 95404.684] (EE) Segmentation fault at address 0x55b5a624bfc8
[ 95404.684] (EE) 
Fatal server error:
[ 95404.684] (EE) Caught signal 11 (Segmentation fault). Server aborting

After the crash I installed the suggested kernel and now got the following version installed:
Linux hostname 4.4.0-040400rc8-generic #201601051225 SMP Tue Jan 5 17:27:39 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux

Please note that I saw the following warning during the kernel installation:
W: Possible missing firmware /lib/firmware/i915/skl_guc_ver4.bin for module i915

I don't know if this prevents us making sure that this error is fixed in
the kernel I installed.

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https://bugs.launchpad.net/bugs/1523444

Title:
  Xorg crahed with segfault

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  I was about to click on a button in Chromium when Xorg unexpectedly crashed.
  This bug just happened and I doubt that it is reproducible.
  This might be a kernel and not an xorg error, please re-categorize if needed.

  Relevant section from the Xorg files:
  [  6812.749] (EE) Backtrace:
  [  6812.749] (EE) 0: /usr/bin/X (xorg_backtrace+0x4e) [0x55f0bc03968e]
  [  6812.749] (EE) 1: /usr/bin/X (0x55f0bbe85000+0x1b89f9) [0x55f0bc03d9f9]
  [  6812.749] (EE) 2: /lib/x86_64-linux-gnu/libc.so.6 (0x7f5e9cbbe000+0x352f0) [0x7f5e9cbf32f0]
  [  6812.749] (EE) 
  [  6812.749] (EE) Segmentation fault at address 0x0
  [  6812.749] (EE) 
  Fatal server error:
  [  6812.749] (EE) Caught signal 11 (Segmentation fault). Server aborting
  [  6812.749] (EE) 
  [  6812.749] (EE) 

  Relevant section from syslog:
  Dec  7 11:39:25 ultra-d kernel: [ 6818.582120] ------------[ cut here ]------------
  Dec  7 11:39:25 ultra-d kernel: [ 6818.582137] WARNING: CPU: 3 PID: 1318 at /build/linux-26_gwp/linux-4.2.0/drivers/gpu/drm/i915/i915_gem.c:5269 i915_gem_track_fb+0x129/0x140 [i915]()
  Dec  7 11:39:25 ultra-d kernel: [ 6818.582139] WARN_ON(!(old->frontbuffer_bits & frontbuffer_bits))
  Dec  7 11:39:25 ultra-d kernel: [ 6818.582139] Modules linked in: pci_stub vboxpci(OE) vboxnetadp(OE) vboxnetflt(OE) vboxdrv(OE) nfsv3 nfs_acl rpcsec_gss_krb5 auth_rpcgss nfsv4 nfs lockd grace fscache hp_wmi spa
  rse_keymap intel_rapl iosf_mbi x86_pkg_temp_thermal intel_powerclamp coretemp joydev snd_hda_codec_hdmi input_leds snd_hda_codec_realtek kvm_intel snd_hda_codec_generic kvm snd_hda_intel snd_hda_codec crct10dif_
  pclmul snd_hda_core crc32_pclmul snd_hwdep snd_pcm aesni_intel aes_x86_64 lrw gf128mul snd_seq_midi glue_helper snd_seq_midi_event ablk_helper cryptd snd_rawmidi snd_seq snd_seq_device serio_raw snd_timer snd so
  undcore mei_me mei lpc_ich 8250_fintek tpm_infineon mac_hid ipt_REJECT nf_reject_ipv4 nf_log_ipv4 nf_log_common xt_LOG xt_recent xt_limit xt_tcpudp xt_addrtype nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack ip6ta
  ble_filter ip6_tables nf_conntrack_pptp nf_conntrack_proto_gre nf_conntrack_netbios_ns nf_conntrack_broadcast nf_nat_ftp nf_nat nf_conntrack_ftp nf_conntrack iptable_filter ip_tables x_tables sunrpc parport_pc p
  pdev lp parport autofs4 hid_generic usbhid hid i915 psmouse i2c_algo_bit drm_kms_helper e1000e ahci drm libahci ptp pps_core wmi video
  Dec  7 11:39:25 ultra-d kernel: [ 6818.582178] CPU: 3 PID: 1318 Comm: Xorg Tainted: G           OE   4.2.0-19-generic #23-Ubuntu
  Dec  7 11:39:25 ultra-d kernel: [ 6818.582179] Hardware name: Hewlett-Packard HP EliteDesk 800 G1 SFF/1998, BIOS L01 v02.65 07/13/2015
  Dec  7 11:39:25 ultra-d kernel: [ 6818.582180]  0000000000000000 00000000466f5698 ffff880212e8fac8 ffffffff817e93f9
  Dec  7 11:39:25 ultra-d kernel: [ 6818.582182]  0000000000000000 ffff880212e8fb20 ffff880212e8fb08 ffffffff8107b3d6
  Dec  7 11:39:25 ultra-d kernel: [ 6818.582183]  ffff880211e43600 0000000000000010 ffff880211b7c000 ffff880211b7c000
  Dec  7 11:39:25 ultra-d kernel: [ 6818.582184] Call Trace:
  Dec  7 11:39:25 ultra-d kernel: [ 6818.582188]  [<ffffffff817e93f9>] dump_stack+0x45/0x57
  Dec  7 11:39:25 ultra-d kernel: [ 6818.582191]  [<ffffffff8107b3d6>] warn_slowpath_common+0x86/0xc0
  Dec  7 11:39:25 ultra-d kernel: [ 6818.582193]  [<ffffffff8107b465>] warn_slowpath_fmt+0x55/0x70
  Dec  7 11:39:25 ultra-d kernel: [ 6818.582200]  [<ffffffffc019fec9>] i915_gem_track_fb+0x129/0x140 [i915]
  Dec  7 11:39:25 ultra-d kernel: [ 6818.582211]  [<ffffffffc01e8157>] intel_prepare_plane_fb+0xe7/0x1a0 [i915]
  Dec  7 11:39:25 ultra-d kernel: [ 6818.582215]  [<ffffffffc011a009>] drm_atomic_helper_prepare_planes+0x59/0xe0 [drm_kms_helper]
  Dec  7 11:39:25 ultra-d kernel: [ 6818.582225]  [<ffffffffc005c9e5>] ? drm_atomic_check_only+0x215/0x540 [drm]
  Dec  7 11:39:25 ultra-d kernel: [ 6818.582235]  [<ffffffffc01f8e12>] intel_atomic_commit+0x42/0x100 [i915]
  Dec  7 11:39:25 ultra-d kernel: [ 6818.582242]  [<ffffffffc005cd47>] drm_atomic_commit+0x37/0x60 [drm]
  Dec  7 11:39:25 ultra-d kernel: [ 6818.582245]  [<ffffffffc011b677>] drm_atomic_helper_plane_set_property+0x87/0xc0 [drm_kms_helper]
  Dec  7 11:39:25 ultra-d kernel: [ 6818.582250]  [<ffffffffc004a739>] ? _object_find+0x69/0xa0 [drm]
  Dec  7 11:39:25 ultra-d kernel: [ 6818.582255]  [<ffffffffc004afbd>] drm_mode_plane_set_obj_prop+0x2d/0x90 [drm]
  Dec  7 11:39:25 ultra-d kernel: [ 6818.582261]  [<ffffffffc0051a76>] drm_mode_obj_set_property_ioctl+0x1c6/0x270 [drm]
  Dec  7 11:39:25 ultra-d kernel: [ 6818.582265]  [<ffffffffc0041495>] drm_ioctl+0x125/0x610 [drm]
  Dec  7 11:39:25 ultra-d kernel: [ 6818.582267]  [<ffffffff8123e836>] ? fsnotify+0x316/0x4a0
  Dec  7 11:39:25 ultra-d kernel: [ 6818.582272]  [<ffffffffc00518b0>] ? drm_mode_obj_get_properties_ioctl+0xa0/0xa0 [drm]
  Dec  7 11:39:25 ultra-d kernel: [ 6818.582274]  [<ffffffff81210a25>] do_vfs_ioctl+0x295/0x480
  Dec  7 11:39:25 ultra-d kernel: [ 6818.582276]  [<ffffffff811ff7f5>] ? __sb_end_write+0x35/0x70
  Dec  7 11:39:25 ultra-d kernel: [ 6818.582277]  [<ffffffff811fd42a>] ? vfs_write+0x15a/0x1a0
  Dec  7 11:39:25 ultra-d kernel: [ 6818.582278]  [<ffffffff81210c89>] SyS_ioctl+0x79/0x90
  Dec  7 11:39:25 ultra-d kernel: [ 6818.582280]  [<ffffffff817f01f2>] entry_SYSCALL_64_fastpath+0x16/0x75
  Dec  7 11:39:25 ultra-d kernel: [ 6818.582281] ---[ end trace 6e41c462e0fbe35d ]---

  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: xorg 1:7.7+7ubuntu4
  ProcVersionSignature: Ubuntu 4.2.0-19.23-generic 4.2.6
  Uname: Linux 4.2.0-19-generic x86_64
  ApportVersion: 2.19.1-0ubuntu5
  Architecture: amd64
  CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
  CompositorRunning: None
  CurrentDesktop: GNOME
  Date: Mon Dec  7 11:49:08 2015
  DistUpgraded: 2015-11-06 17:27:19,974 DEBUG enabling apt cron job
  DistroCodename: wily
  DistroVariant: ubuntu
  DkmsStatus:
   virtualbox, 5.0.10, 4.2.0-18-generic, x86_64: installed
   virtualbox, 5.0.10, 4.2.0-19-generic, x86_64: installed
  ExtraDebuggingInterest: Yes
  GraphicsCard:
   Intel Corporation Xeon E3-1200 v3/4th Gen Core Processor Integrated Graphics Controller [8086:0412] (rev 06) (prog-if 00 [VGA controller])
     Subsystem: Hewlett-Packard Company Device [103c:1998]
  InstallationDate: Installed on 2015-06-26 (163 days ago)
  InstallationMedia: Ubuntu-GNOME 15.04 "Vivid Vervet" - Release amd64 (20150422)
  MachineType: Hewlett-Packard HP EliteDesk 800 G1 SFF
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.2.0-19-generic root=/dev/mapper/system_vg-root_lv ro noprompt persistent quiet splash vt.handoff=7
  SourcePackage: xorg
  UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev'
  UpgradeStatus: Upgraded to wily on 2015-11-06 (30 days ago)
  dmi.bios.date: 07/13/2015
  dmi.bios.vendor: Hewlett-Packard
  dmi.bios.version: L01 v02.65
  dmi.board.asset.tag: CZC4033CYV
  dmi.board.name: 1998
  dmi.board.vendor: Hewlett-Packard
  dmi.chassis.asset.tag: CZC4033CYV
  dmi.chassis.type: 4
  dmi.chassis.vendor: Hewlett-Packard
  dmi.modalias: dmi:bvnHewlett-Packard:bvrL01v02.65:bd07/13/2015:svnHewlett-Packard:pnHPEliteDesk800G1SFF:pvr:rvnHewlett-Packard:rn1998:rvr:cvnHewlett-Packard:ct4:cvr:
  dmi.product.name: HP EliteDesk 800 G1 SFF
  dmi.sys.vendor: Hewlett-Packard
  version.compiz: compiz N/A
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.64-1
  version.libgl1-mesa-dri: libgl1-mesa-dri 11.0.2-1ubuntu4
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 11.0.2-1ubuntu4
  version.xserver-xorg-core: xserver-xorg-core 2:1.17.2-1ubuntu9.1
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.9.2-1ubuntu1
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.5.0+git20150819-0ubuntu1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20150808-0ubuntu4
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.11-1ubuntu3
  xserver.bootTime: Mon Dec  7 11:39:36 2015
  xserver.configfile: default
  xserver.errors:
   
  xserver.logfile: /var/log/Xorg.0.log
  xserver.outputs:
   product id                               12446 
   vendor                                     HWP
  xserver.version: 2:1.17.2-1ubuntu9.1

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