unity-greeter crashed with SIGSEGV in background_loader_load()

[Eric Hartmann]

The unity-greeter is crashing everytime since update from 02/16/2012

ProblemType: Crash
DistroRelease: Ubuntu 12.04
Package: unity-greeter 0.2.3-0ubuntu3
ProcVersionSignature: Ubuntu 3.2.0-16.25-generic 3.2.6
Uname: Linux 3.2.0-16-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 1.91-0ubuntu1
Architecture: amd64
Date: Fri Feb 17 08:54:16 2012
ExecutablePath: /usr/sbin/unity-greeter
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
ProcCmdline: /usr/sbin/unity-greeter
ProcEnviron:
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/false
SegvAnalysis:
 Segfault happened at: 0x40abb8: mov (%rdx),%ecx
 PC (0x0040abb8) ok
 source "(%rdx)" (0x00000000) not located in a known VMA region (needed readable region)!
 destination "%ecx" ok
SegvReason: reading NULL VMA
Signal: 11
SourcePackage: unity-greeter
StacktraceTop:
 ?? ()
 ?? ()
 ?? ()
 g_closure_invoke () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
 ?? () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
Title: unity-greeter crashed with SIGSEGV in g_closure_invoke()
UpgradeStatus: Upgraded to precise on 2011-12-21 (57 days ago)
UserGroups:

modified.conffile..etc.lightdm.unity.greeter.conf: [modified]
mtime.conffile..etc.lightdm.unity.greeter.conf: 2011-11-13T21:00:20.247869

[Apport retracing service (apport)]

StacktraceTop:
 background_loader_load (self=0x1a1b5c0) at background.c:381
 background_load_background (self=0x1b3c0b0, filename=0x1b3f1c0 "/usr/share/backgrounds/warty-final-ubuntu.png") at background.c:2149
 background_real_size_allocate (base=0x1b3c0b0, allocation=<optimized out>) at background.c:1474
 g_closure_invoke (closure=0x41c13d, return_value=0x0, n_param_values=<optimized out>, param_values=0x1d08e30, invocation_hint=<optimized out>) at /build/buildd/glib2.0-2.31.16/./gobject/gclosure.c:784
 ?? ()

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Michael Terry (mterry)]

This happens whenever all a user's monitors have the same size. Which happens with NVidia TwinView at least. Patch coming.

[Launchpad Janitor (janitor)]

This bug was fixed in the package unity-greeter - 0.2.3-0ubuntu4

---------------
unity-greeter (0.2.3-0ubuntu4) precise; urgency=low

  * debian/patches/do_not_crash_with_twinview.patch:
    - Don't crash when all monitors have the same size (as can happen with
      TwinView) LP: #934040
 -- Michael Terry <email address hidden> Fri, 17 Feb 2012 17:43:37 -0500

[Eric Hartmann (hartmann-eric)]

Sorry for the late response. I confirm that the bug is now fixed.

Thanks