unity-greeter crashed with SIGSEGV in user_list_show_prompt() in live session

[Fabio Marconi]

Hello
Live session from usb with persistence just started and apport popup this
Thanks
fabio

ProblemType: Crash
DistroRelease: Ubuntu 12.04
Package: unity-greeter 0.2.4-0ubuntu2
ProcVersionSignature: Ubuntu 3.2.0-18.29-generic 3.2.9
Uname: Linux 3.2.0-18-generic x86_64
ApportVersion: 1.94.1-0ubuntu2
Architecture: amd64
CasperVersion: 1.307
Date: Sun Mar 11 20:19:16 2012
ExecutablePath: /usr/sbin/unity-greeter
ExecutableTimestamp: 1331119338
LiveMediaBuild: Ubuntu 12.04 LTS "Precise Pangolin" - Alpha amd64 (20120311)
ProcCmdline: /usr/sbin/unity-greeter
ProcCwd: /var/lib/lightdm
ProcEnviron:
 LANG=en_US.UTF-8
 SHELL=/bin/false
SegvAnalysis:
 Segfault happened at: 0x41ca56: cmpq $0x0,0x18(%rdx)
 PC (0x0041ca56) ok
 source "$0x0" ok
 destination "0x18(%rdx)" (0x00000018) not located in a known VMA region (needed writable region)!
SegvReason: writing 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
 g_signal_emit_valist () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
 g_signal_emit () from /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0
Title: unity-greeter crashed with SIGSEGV in g_closure_invoke()
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups:

[Apport retracing service (apport)]

StacktraceTop:
 user_list_show_prompt (self=0xbbc1c0, text=0xd4ac10 "\220\006\332", secret=0) at user-list.c:1307
 g_closure_invoke (closure=0xaf45d0, return_value=0x0, n_param_values=3, param_values=0xd88850, invocation_hint=<optimized out>) at /build/buildd/glib2.0-2.31.20/./gobject/gclosure.c:777
 signal_emit_unlocked_R (node=<optimized out>, detail=0, instance=<optimized out>, emission_return=0x0, instance_and_params=0xd88850) at /build/buildd/glib2.0-2.31.20/./gobject/gsignal.c:3547
 g_signal_emit_valist (instance=<optimized out>, signal_id=<optimized out>, detail=0, var_args=<optimized out>) at /build/buildd/glib2.0-2.31.20/./gobject/gsignal.c:3295
 g_signal_emit (instance=<optimized out>, signal_id=<optimized out>, detail=<optimized out>) at /build/buildd/glib2.0-2.31.20/./gobject/gsignal.c:3352

[Launchpad Janitor (janitor)]

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

[Stéphane Graber (stgraber)]

Same issue affecting all live media on logout, bumping to high.

[Michael Terry (mterry)]

This appears to be because the user list was empty, and unity-greeter didn't handle that well.

This is already fixed in trunk by adding a manual entry field when that happens.

[Doug McMahon (mc3man)]

On 03/13/2012 03:11 PM, Michael Terry wrote:
> This appears to be because the user list was empty, and unity-greeter
> didn't handle that well.
>
> This is already fixed in trunk by adding a manual entry field when that
> happens.
>
> ** Also affects: unity-greeter
> Importance: Undecided
> Status: New
>
> ** Changed in: unity-greeter
> Status: New => Fix Committed
>
That seems to make sense, if I create a new user then I can log out & in
to it.
Though currently when doing that there seems to be no way to return to
the ubuntu user & a new user. standard or admin, usually fails to get a
successful restart or shutdown

[Launchpad Janitor (janitor)]

This bug was fixed in the package unity-greeter - 0.2.5-0ubuntu1

---------------
unity-greeter (0.2.5-0ubuntu1) precise; urgency=low

  * New upstream release
    - Don't allow dragging the window by the top bar
    - Fix keyboard navigation (LP: #952198, LP: #940921)
    - Fix prompt entry text not showing in some themes
    - Fix Orca command line so it works with version 3.3.90+
    - Show "Retry" instead of "Login" if a no-prompt login fails
    - Show manual login option when no users available (LP: #952557)
    - Show manual login option if hint is present (LP: #925125)
    - Show PAM prompts, albeit not in a pretty fashion
    - Allow pressing Escape to cancel a misbehaving login
    - Tweaked animations
    - Update logo to add "LTS" (LP: #943465)
  * debian/patches/dont_dnd_greeter.patch:
    - Dropped, included upstream
 -- Michael Terry <email address hidden> Thu, 15 Mar 2012 09:37:28 -0400

[Shahar Or (mightyiam)]

Awesome! Thanks, Michael!