Public bug reported:

Something went wrong with my Ubuntu 16.04 LTS desktop today.  When I got
back to the system Mattermost and a Chrome were indicating that the
network was not working.  I started to look about and it seemed that my
main ethernet network connection had lost its IPv4 address somehow.
ifconfig and the GUI network manager confirmed this.

To try and resolve this I physically removed the connector and the
plugged it back in.  Shortly after I did this my GUI seemed to die out
and I ended up back at the login screen.

Once everything had calmed down I logged back in.  After some digging
about in the logs I noticed the following in /var/log/kern.log

Oct 25 13:01:09 thorne-ul-dt kernel: [694321.877561] Mattermost[744]: segfault 
at 968 ip 00007f8a9e257643 sp 00007ffe72a3b510 error 4 in 
libX11.so.6.3.0[7f8a9e22f000+135000]
Oct 25 13:01:09 thorne-ul-dt kernel: [694322.029362] chrome[745]: segfault at 
968 ip 00007fd4b5c73643 sp 00007fff94f78d90 error 4 in 
libX11.so.6.3.0[7fd4b5c4b000+135000]

That seemed to be the correct time for the problem I noticed.   What
exactly caused it I am not sure.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: libx11-6 2:1.6.3-1ubuntu2
ProcVersionSignature: Ubuntu 4.4.0-42.62-generic 4.4.21
Uname: Linux 4.4.0-42-generic x86_64
.tmp.unity_support_test.0:
 
ApportVersion: 2.20.1-0ubuntu2.1
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: Tue Oct 25 17:07:28 2016
DistUpgraded: Fresh install
DistroCodename: xenial
DistroVariant: ubuntu
GraphicsCard:
 Intel Corporation Xeon E3-1200 v3/4th Gen Core Processor Integrated Graphics 
Controller [8086:0412] (rev 06) (prog-if 00 [VGA controller])
   Subsystem: Gigabyte Technology Co., Ltd Xeon E3-1200 v3/4th Gen Core 
Processor Integrated Graphics Controller [1458:d000]
InstallationDate: Installed on 2015-03-12 (592 days ago)
InstallationMedia: Ubuntu 14.04.2 LTS "Trusty Tahr" - Release amd64 (20150218.1)
MachineType: Gigabyte Technology Co., Ltd. H81M-DS2V
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.4.0-38-generic.efi.signed 
root=/dev/mapper/ubuntu--vg-root ro quiet splash crashkernel=384M-:128M 
vt.handoff=7
SourcePackage: libx11
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 08/11/2015
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: F6
dmi.board.asset.tag: To be filled by O.E.M.
dmi.board.name: H81M-DS2V
dmi.board.vendor: Gigabyte Technology Co., Ltd.
dmi.board.version: x.x
dmi.chassis.asset.tag: To Be Filled By O.E.M.
dmi.chassis.type: 3
dmi.chassis.vendor: Gigabyte Technology Co., Ltd.
dmi.chassis.version: To Be Filled By O.E.M.
dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvrF6:bd08/11/2015:svnGigabyteTechnologyCo.,Ltd.:pnH81M-DS2V:pvrTobefilledbyO.E.M.:rvnGigabyteTechnologyCo.,Ltd.:rnH81M-DS2V:rvrx.x:cvnGigabyteTechnologyCo.,Ltd.:ct3:cvrToBeFilledByO.E.M.:
dmi.product.name: H81M-DS2V
dmi.product.version: To be filled by O.E.M.
dmi.sys.vendor: Gigabyte Technology Co., Ltd.
version.compiz: compiz 1:0.9.12.2+16.04.20160823-0ubuntu1
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.67-1ubuntu0.16.04.2
version.libgl1-mesa-dri: libgl1-mesa-dri 11.2.0-1ubuntu2.2
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 11.2.0-1ubuntu2.2
version.xserver-xorg-core: xserver-xorg-core 2:1.18.4-0ubuntu0.1
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+git20160325-1ubuntu1.1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.12-1build2
xserver.bootTime: Tue Oct 25 13:01:04 2016
xserver.configfile: default
xserver.errors:
 
xserver.logfile: /var/log/Xorg.0.log
xserver.outputs:
 product id                               30926 
 vendor                                     BNQ
xserver.version: 2:1.18.4-0ubuntu0.1

** Affects: libx11 (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug compiz-0.9 ubuntu xenial

-- 
You received this bug notification because you are a member of Ubuntu-X,
which is subscribed to libx11 in Ubuntu.
https://bugs.launchpad.net/bugs/1636564

Title:
  Segfault from libX11.so.6.3.0

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