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[Dale Spanheimer <dspanheimer@xxxxxxxxx>]

This may be a teamviewer problem. I don't know if it is relevant, but when searching /var/log for any mention of munmap, I got the following results:
----------------------------------------
dvs4@dvs4-E6540:/var/log$ sudo grep -R munmap *
auth.log:Dec  7 08:31:22 dvs4-E6540 sudo:     dvs4 : TTY=pts/2 ; PWD=/var/log ; USER=root ; COMMAND=/bin/grep munmap alternatives.log alternatives.log.1 alternatives.log.10.gz alternatives.log.11.gz alternatives.log.12.gz alternatives.log.2.gz alternatives.log.3.gz alternatives.log.4.gz alternatives.log.5.gz alternatives.log.6.gz alternatives.log.7.gz alternatives.log.8.gz alternatives.log.9.gz apache2 apport.log apport.log.1 apport.log.2.gz apport.log.3.gz apport.log.4.gz apport.log.5.gz apport.log.6.gz apport.log.7.gz apt auth.log auth.log.1 auth.log.2.gz auth.log.3.gz auth.log.4.gz boot.log bootstrap.log btmp btmp.1 chkrootkit ConsoleKit cups dirmngr dist-upgrade dmesg dmesg.0 dmesg.1.gz dmesg.2.gz dmesg.3.gz dmesg.4.gz dpkg.log dpkg.log.1 dpkg.log.10.gz dpkg.log.11.gz dpkg.log.12.gz dpkg.log.2.gz dpkg.log.3.gz dpkg.log.4.gz dpkg.log.5.gz dpkg.log.6.gz dpkg.log.7.gz dpkg.log.8.gz dpkg.log.9.gz faillog fontconfig.log fsck git-daemon gpu-manager.log hp installer kern.log kern.log.1
auth.log:Dec  7 08:32:45 dvs4-E6540 sudo:     dvs4 : TTY=pts/2 ; PWD=/var/log ; USER=root ; COMMAND=/bin/grep -R munmap alternatives.log alternatives.log.1 alternatives.log.10.gz alternatives.log.11.gz alternatives.log.12.gz alternatives.log.2.gz alternatives.log.3.gz alternatives.log.4.gz alternatives.log.5.gz alternatives.log.6.gz alternatives.log.7.gz alternatives.log.8.gz alternatives.log.9.gz apache2 apport.log apport.log.1 apport.log.2.gz apport.log.3.gz apport.log.4.gz apport.log.5.gz apport.log.6.gz apport.log.7.gz apt auth.log auth.log.1 auth.log.2.gz auth.log.3.gz auth.log.4.gz boot.log bootstrap.log btmp btmp.1 chkrootkit ConsoleKit cups dirmngr dist-upgrade dmesg dmesg.0 dmesg.1.gz dmesg.2.gz dmesg.3.gz dmesg.4.gz dpkg.log dpkg.log.1 dpkg.log.10.gz dpkg.log.11.gz dpkg.log.12.gz dpkg.log.2.gz dpkg.log.3.gz dpkg.log.4.gz dpkg.log.5.gz dpkg.log.6.gz dpkg.log.7.gz dpkg.log.8.gz dpkg.log.9.gz faillog fontconfig.log fsck git-daemon gpu-manager.log hp installer kern.log kern.log.1
grep: teamviewer/lightdm: No such file or directory
----------------------------------------
ls -al in /var/log shows the following link for teamviewer
lrwxrwxrwx  1 root    root         24 Jan 15  2015 teamviewer -> /opt/teamviewer/logfiles

Checking that link includes the following lightdm link:
dvs4@dvs4-E6540:/var/log$ ls -al /opt/teamviewer/logfiles/
lrwxrwxrwx 1 root root      41 Dec 10  2014 dvs4 -> /home/dvs4/.config/teamviewer10/logfiles/
lrwxrwxrwx 1 root root      47 Feb  3  2015 lightdm -> /var/lib/lightdm/.config/teamviewer10/logfiles/

Checking where that should point to shows it is not there:
dvs4@dvs4-E6540:/var/log$ sudo ls -al /var/lib/lightdm/*
ls: cannot access /var/lib/lightdm/*: No such file or directory

Because of the similarities and because I am the only user on this machine, I changed the lightdm link to match the dvs4 user link:
lrwxrwxrwx 1 root root      41 Dec  7 08:36 lightdm -> /home/dvs4/.config/teamviewer10/logfiles/

I have never seen this particular error before, but I have had some
annoying glitches with the way Teamviewer starts, so I will try it this
way for a while and see if it seems to make any difference...

-- 
You received this bug notification because you are a member of Desktop
Packages, which is subscribed to lightdm in Ubuntu.
https://bugs.launchpad.net/bugs/1504724

Title:
  lightdm crashed with SIGSEGV in munmap()

Status in lightdm package in Ubuntu:
  Confirmed

Bug description:
  crash at startup

  ProblemType: Crash
  DistroRelease: Ubuntu 15.10
  Package: lightdm 1.16.3-0ubuntu1
  ProcVersionSignature: Ubuntu 4.2.0-15.18-generic 4.2.3
  Uname: Linux 4.2.0-15-generic x86_64
  NonfreeKernelModules: nvidia
  ApportVersion: 2.19.1-0ubuntu2
  Architecture: amd64
  Date: Fri Oct  9 23:46:03 2015
  ExecutablePath: /usr/sbin/lightdm
  LightdmGreeterLog:
   ** Message: Starting lightdm-gtk-greeter 2.0.1 (Aug  7 2015, 01:24:18)
   ** Message: [Configuration] Reading file: /etc/lightdm/lightdm-gtk-greeter.conf.d/01_ubuntu.conf
   ** Message: [Configuration] Reading file: /etc/lightdm/lightdm-gtk-greeter.conf.d/99_ubuntu-mate.conf
   ** Message: [Configuration] Reading file: /etc/lightdm/lightdm-gtk-greeter.conf
   upstart: indicator-application main process (2433) terminated with status 1
  LightdmGreeterLogOld:
   ** Message: Starting lightdm-gtk-greeter 2.0.1 (Aug  7 2015, 01:24:18)
   ** Message: [Configuration] Reading file: /etc/lightdm/lightdm-gtk-greeter.conf.d/01_ubuntu.conf
   ** Message: [Configuration] Reading file: /etc/lightdm/lightdm-gtk-greeter.conf.d/99_ubuntu-mate.conf
   ** Message: [Configuration] Reading file: /etc/lightdm/lightdm-gtk-greeter.conf
   upstart: indicator-application main process (2426) killed by TERM signal
  ProcCmdline: lightdm --session-child 12 19
  ProcEnviron:
   TERM=linux
   PATH=(custom, no user)
  SegvAnalysis:
   Segfault happened at: 0x7f8c59f0fb94 <_dl_fini+452>:	add    0x8(%rax),%r12
   PC (0x7f8c59f0fb94) ok
   source "0x8(%rax)" (0x7f8c4a545e08) not located in a known VMA region (needed readable region)!
   destination "%r12" ok
  SegvReason: reading unknown VMA
  Signal: 11
  SourcePackage: lightdm
  StacktraceTop:
   munmap () at ../sysdeps/unix/syscall-template.S:81
   _dl_unmap_segments (l=0x1d2c910, l=0x1d2c910) at ./dl-unmap-segments.h:32
   _dl_unmap (map=map@entry=0x1d2c910) at ../sysdeps/x86_64/tlsdesc.c:140
   _dl_close_worker (map=map@entry=0x1d2c440) at dl-close.c:641
   _dl_close_worker (map=0x1d2c440) at dl-close.c:125
  Title: lightdm crashed with SIGSEGV in munmap()
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups:

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