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[Iain Hamilton <iain@xxxxxxxxxx>]

occurred here when I tried to switch user. When I entered the password
there was no response after several minutes and no way of progressing or
rolling back the process. Had to force a reboot from a terminal.

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https://bugs.launchpad.net/bugs/833925

Title:
  lightdm crashed with SIGSEGV in initialize_password_db()

Status in “lightdm” package in Ubuntu:
  Confirmed

Bug description:
  LightDM took a long time to verify my password and after that this bug
  report appeared.

  jose@JARR-Laptop:~$ lsb_release -rd
  Description:	Ubuntu oneiric (development branch)
  Release:	11.10

  jose@JARR-Laptop:~$ apt-cache policy lightdm
  lightdm:
    Installed: 0.9.3-0ubuntu7
    Candidate: 0.9.3-0ubuntu7
    Version table:
   *** 0.9.3-0ubuntu7 0
          500 http://archive.ubuntu.com/ubuntu/ oneiric/main amd64 Packages
          100 /var/lib/dpkg/status

  ProblemType: Crash
  DistroRelease: Ubuntu 11.10
  Package: lightdm 0.9.3-0ubuntu7
  ProcVersionSignature: Ubuntu 3.0.0-9.14-generic 3.0.3
  Uname: Linux 3.0.0-9-generic x86_64
  NonfreeKernelModules: wl
  Architecture: amd64
  Date: Thu Aug 25 17:42:30 2011
  Disassembly: => 0x0:	Cannot access memory at address 0x0
  ExecutablePath: /usr/sbin/lightdm
  InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Alpha amd64 (20110803.1)
  ProcCmdline: lightdm
  ProcEnviron: PATH=(custom, no user)
  SegvAnalysis:
   Segfault happened at: 0x0:	Cannot access memory at address 0x0
   PC (0x00000000) not located in a known VMA region (needed executable region)!
   Stack memory exhausted (SP below stack segment)
  SegvReason: executing NULL VMA
  Signal: 11
  SourcePackage: lightdm
  StacktraceTop:
   ?? ()
   ?? () from /lib/security/pam_smbpass.so
   initialize_password_db () from /lib/security/pam_smbpass.so
   pam_sm_authenticate () from /lib/security/pam_smbpass.so
   ?? () from /lib/x86_64-linux-gnu/libpam.so.0
  Title: lightdm crashed with SIGSEGV in initialize_password_db()
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups:

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