This bug was fixed in the package gdm - 3.0.4-0ubuntu15.3

---------------
gdm (3.0.4-0ubuntu15.3) precise; urgency=low

  * debian/patches/42_no_ecryptfs_autologin.patch:
    - don't try to get infos on null usernames (lp: #805154)
 -- Ryan Tandy <rta...@sd63.bc.ca>   Mon, 25 Nov 2013 13:33:30 -0800

** Changed in: gdm (Ubuntu Precise)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/805154

Title:
  gdm-simple-slave crashed with SIGSEGV in _nss_compat_getpwnam_r()

Status in “gdm” package in Ubuntu:
  Fix Released
Status in “gdm” source package in Oneiric:
  Won't Fix
Status in “gdm” source package in Precise:
  Fix Released

Bug description:
  SRU justification:

  [Impact]

  * With automatic login enabled in /etc/gdm/custom.conf, gdm crashes
  instead of logging in, and doesn't respawn, dropping to a text console
  instead.

  [Test Case]

  * install gdm and choose it as the default display manager at the
  debconf prompt

  * create /etc/gdm/custom.conf with contents:

  [daemon]
  AutomaticLoginEnable=true
  AutomaticLogin=some-username

  (where "some-username" is a user on the system)

  * Reboot (or stop the previous display manager and start gdm)

  * In gdm in precise-updates, instead of logging in, gdm crashes, the
  system drops to a text console, and a gdm-simple-slave segfault is
  recorded in dmesg.

  [Regression Potential]

  * Minimal. The change consists only of adding a missing NULL parameter
  check.

  Original description:

  Chrash happend while trying to change a desktop-icon. Searching the
  icon in a hidden folder ".xxxx" in the user directory.

  ProblemType: Crash
  DistroRelease: Ubuntu 11.10
  Package: gdm 3.0.4-0ubuntu3
  ProcVersionSignature: Ubuntu 3.0-2.3-generic-pae 3.0.0-rc4
  Uname: Linux 3.0-2-generic-pae i686
  NonfreeKernelModules: fglrx
  Architecture: i386
  Date: Sun Jul  3 01:25:08 2011
  ExecutablePath: /usr/lib/gdm/gdm-simple-slave
  InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Alpha i386 (20110531.1)
  ProcCmdline: /usr/lib/gdm/gdm-simple-slave --display-id 
/org/gnome/DisplayManager/Display2
  ProcEnviron:
   LANGUAGE=de_AT:de
   PATH=(custom, no user)
   LANG=de_AT.UTF-8
  SegvAnalysis:
   Segfault happened at: 0xb77405b7 <_nss_compat_getpwnam_r+55>:        movzbl 
(%edx),%eax
   PC (0xb77405b7) ok
   source "(%edx)" (0x00000000) not located in a known VMA region (needed 
readable region)!
   destination "%eax" ok
  SegvReason: reading NULL VMA
  Signal: 11
  SourcePackage: gdm
  StacktraceTop:
   _nss_compat_getpwnam_r () from /lib/i386-linux-gnu/libnss_compat.so.2
   getpwnam_r () from /lib/i386-linux-gnu/libc.so.6
   getpwnam () from /lib/i386-linux-gnu/libc.so.6
   ?? ()
   ?? ()
  Title: gdm-simple-slave crashed with SIGSEGV in _nss_compat_getpwnam_r()
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups:

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