Xorg crashed with SIGSEGV

[Robert Jordens]

Crashes might be related to full screen video. Crashes when exiting fullscreen or switching windows.

ProblemType: Crash
DistroRelease: Ubuntu 15.10
Package: xserver-xorg-core 2:1.17.2-1ubuntu7
ProcVersionSignature: Ubuntu 4.2.0-11.13-generic 4.2.1
Uname: Linux 4.2.0-11-generic x86_64
.tmp.unity.support.test.0:

ApportVersion: 2.19-0ubuntu1
Architecture: amd64
BootLog:
 Scanning for Btrfs filesystems
 fsck from util-linux 2.26.2
 tito-root: clean, 2076967/15114240 files, 50801586/60448000 blocks
CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
CompositorRunning: compiz
CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
CompositorUnredirectFSW: true
Date: Sat Sep 26 23:54:31 2015
DistUpgraded: 2015-07-22 01:05:44,405 DEBUG enabling apt cron job
DistroCodename: wily
DistroVariant: ubuntu
DkmsStatus:
 acpi-call, 1.1.0, 4.2.0-11-generic, x86_64: installed
 virtualbox, 5.0.4, 4.2.0-11-generic, x86_64: installed
ExecutablePath: /usr/bin/Xorg
GraphicsCard:
 Intel Corporation Haswell-ULT Integrated Graphics Controller [8086:0a16] (rev 0b) (prog-if 00 [VGA controller])
   Subsystem: Dell Device [1028:060a]
InstallationDate: Installed on 2014-08-08 (414 days ago)
InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
MachineType: Dell Inc. XPS13 9333
ProcCmdline: /usr/bin/X -core :0 -seat seat0 -auth /var/run/lightdm/root/:0 -nolisten tcp vt7 -novtswitch
ProcEnviron:

ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.2.0-11-generic root=UUID=8a50e235-2691-4a4a-b587-3bb79f18c59c ro splash quiet i915.enable_psr=1 vt.handoff=7
SegvAnalysis:
 Segfault happened at: 0x7fe56794acf9: cmpb $0x48,(%rax)
 PC (0x7fe56794acf9) ok
 source "$0x48" ok
 destination "(%rax)" (0x000023f2) not located in a known VMA region (needed writable region)!
SegvReason: writing NULL VMA
Signal: 11
SourcePackage: xorg-server
StacktraceTop:
 ?? ()
 ?? () from /usr/lib/xorg/modules/drivers/intel_drv.so
 ?? () from /usr/lib/xorg/modules/drivers/intel_drv.so
 ?? () from /usr/lib/xorg/modules/drivers/intel_drv.so
 ?? () from /usr/lib/xorg/modules/drivers/intel_drv.so
Title: Xorg crashed with SIGSEGV
UpgradeStatus: Upgraded to wily on 2015-07-22 (66 days ago)
UserGroups:

dmi.bios.date: 03/27/2015
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A07
dmi.board.name: 0D13CR
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.type: 8
dmi.chassis.vendor: Dell Inc.
dmi.chassis.version: 0.1
dmi.modalias: dmi:bvnDellInc.:bvrA07:bd03/27/2015:svnDellInc.:pnXPS139333:pvr:rvnDellInc.:rn0D13CR:rvrA00:cvnDellInc.:ct8:cvr0.1:
dmi.product.name: XPS13 9333
dmi.sys.vendor: Dell Inc.
version.compiz: compiz 1:0.9.12.2+15.10.20150908-0ubuntu1
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.64-1
version.libgl1-mesa-dri: libgl1-mesa-dri 11.0.0-1ubuntu1
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 11.0.0-1ubuntu1
version.xserver-xorg-core: xserver-xorg-core 2:1.17.2-1ubuntu7
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+git20150808-0ubuntu2
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.11-1ubuntu3
xserver.bootTime: Sat Sep 26 23:54:36 2015
xserver.configfile: default
xserver.errors:

xserver.logfile: /var/log/Xorg.0.log
xserver.outputs:
 product id 4933
 vendor CMN
xserver.version: 2:1.17.2-1ubuntu7

[Launchpad Janitor (janitor)]

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

[Yuriy Vidineev (adeptg)]

I have the same hardware (Dell XPS13 9333) and very similar problem which I think appears when application uses hardware acceleration.
My software versions is slightly different

xserver-xorg-core-lts-vivid 2:1.17.1-0ubuntu3.1~trusty1
xserver-xorg-video-intel-lts-vivid 2:2.99.917-1~exp1ubuntu2.2~trusty1
linux-image-3.19.0-30-generic 3.19.0-30.34~14.04.1

[ 5655.180] (EE)
[ 5655.181] (EE) Backtrace:
[ 5655.185] (EE) 0: /usr/bin/X (xorg_backtrace+0x48) [0x7fbce7ac3f08]
[ 5655.185] (EE) 1: /usr/bin/X (0x7fbce7923000+0x1a4f39) [0x7fbce7ac7f39]
[ 5655.185] (EE) 2: /lib/x86_64-linux-gnu/libc.so.6 (0x7fbce5aa3000+0x36d40) [0x7fbce5ad9d40]
[ 5655.186] (EE) 3: /usr/lib/xorg/modules/drivers/intel_drv.so (0x7fbce18a1000+0x44c92) [0x7fbce18e5c92]
[ 5655.186] (EE) 4: /usr/bin/X (TypeMask+0x0) [0x7fbce7d60fd0]
[ 5655.186] (EE)
[ 5655.187] (EE) Segmentation fault at address 0xe1c1aae0
[ 5655.187] (EE)
Fatal server error:
[ 5655.187] (EE) Caught signal 11 (Segmentation fault). Server aborting
[ 5655.187] (EE)
[ 5655.187] (EE)
Please consult the The X.Org Foundation support
         at http://wiki.x.org
 for help.
[ 5655.187] (EE) Please also check the log file at "/var/log/Xorg.0.log" for additional information.
[ 5655.187] (EE)
[ 5655.188] (II) AIGLX: Suspending AIGLX clients for VT switch
[ 5655.195] (EE) Server terminated with error (1). Closing log file.

[Kyle Boone (kyboone)]

I am also experiencing this bug on Ubuntu Gnome 15.10 after an upgrade from 15.04. To reproduce it, I logged in, opened up Google Chrome, and went to twitch.tv where I opened a full screen video. The X server crashes within a few seconds after. Non fullscreen video is fine. I have attached an Xorg log from a session like this.

I can also trigger an Xorg crash by switching to the virtual terminal (Ctrl+alt+f1).

[Kyle Boone (kyboone)]

I have reproduced the crash while attached in gdb. Here is a backtrace.

[Luigi R. (xluigi84)]

same problem on ubuntu 14.04 going in fullscreen mode under chrome. The screen becomes white and then I get a crash. Kerner 3.13.0-86-generic and driver i915.