lightdm frozen (SEGV crash) when trying to open a session for another user

Bug #876843 reported by J. Le Clerc
6
This bug affects 1 person
Affects Status Importance Assigned to Milestone
lightdm (Ubuntu)
Incomplete
High
Unassigned

Bug Description

Use case:
1) Boot PC, then open a session for user1 thru lighdm greeter window
2) From user1 session, request a session for another user -> Back on lightdm greeter window
3) Try to open a new session for user2 -> lightdm greeter window frozen + crash of lightdm process

Extract from from syslog:
Oct 17 22:14:24 Hugo-6 kernel: [ 104.665206] lightdm[2097]: segfault at 0 ip (null) sp 00007f8408b9cc78 error 14 in lightdm[400000+27000]
Oct 17 22:14:24 Hugo-6 kernel: [ 104.669289] init: lightdm main process (1306) killed by SEGV signal

I've 2 different desktop PC, running Ubuntu 11.04, different HW, upgraded from previous Ubuntu version
Issue is easily reproducible on both desktops

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: lightdm 1.0.1-0ubuntu6
ProcVersionSignature: Ubuntu 3.0.0-12.20-generic 3.0.4
Uname: Linux 3.0.0-12-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 1.23-0ubuntu3
Architecture: amd64
Date: Mon Oct 17 22:20:10 2011
InstallationMedia: Ubuntu 9.10 "Karmic Koala" - Release amd64 (20091027)
ProcEnviron:
 PATH=(custom, no user)
 LANG=fr_FR.UTF-8
 SHELL=/bin/bash
SourcePackage: lightdm
UpgradeStatus: Upgraded to oneiric on 2011-10-16 (0 days ago)

Revision history for this message
J. Le Clerc (leclercj) wrote :
Revision history for this message
Sebastien Bacher (seb128) wrote :

Thank you for taking the time to report this bug and helping to make Ubuntu better. Please try to obtain a backtrace following the instructions at http://wiki.ubuntu.com/DebuggingProgramCrash and upload the backtrace (as an attachment) to the bug report. This will greatly help us in tracking down your problem.

Changed in lightdm (Ubuntu):
importance: Undecided → High
status: New → Incomplete
Revision history for this message
J. Le Clerc (leclercj) wrote :

Please find attached the required backtraces
Regards

Revision history for this message
Sebastien Bacher (seb128) wrote :

ok, thanks, your issue seems to be with the smbpassword code rather than lightdm, i.e bug #829221

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