gnome-shell crashed with SIGSEGV in g_object_newv()

StacktraceTop:
 caribou_keyboard_model_on_group_changed (self=0x7fc450072320, group=<optimized out>, variant=<optimized out>, grpid=<optimized out>) at keyboard-model.c:439
 caribou_keyboard_model_constructor (type=<optimized out>, n_construct_properties=<optimized out>, construct_properties=<optimized out>) at keyboard-model.c:648
 g_object_newv (object_type=<optimized out>, n_parameters=1, parameters=<optimized out>) at /build/buildd/glib2.0-2.29.92/./gobject/gobject.c:1493
 gjs_object_instance_constructor (context=0x1ebbeb0, argc=<optimized out>, vp=0x7fc45413f4f8) at gi/object.c:693
 CallJSNative (vp=<optimized out>, argc=<optimized out>, native=<optimized out>, cx=0x1ebbeb0) at jscntxtinlines.h:701

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

Thank you for reporting this bug.

I only figured out how to get caribou (GNOME's new screen keyboard system) working yesterday (& the GNOME Shell version only started working with Fedora 16 this week) so it's not as fully tested.

To workaround this until it gets fixed properly:
1. Install caribou
2. Add this line to /etc/xdg/autostart/onboard-autostart.desktop
AutostartCondition=GNOME3 unless-session gnome
3. And add this line to /etc/xdg/autostart/caribou-autostart.desktop
AutostartCondition=GNOME3 unless-session gnome-fallback

That will disable Ubuntu's default screen keyboard (onboard) in GNOME Shell because having 2 onscreen keyboards on the screen at once is ridiculous. Step 3 also makes onboard the default for screen keyboard in GNOME Classic since onboard still works better than caribou's standalone mode.

#6 solved for me!

i also do this (not sure if it's correct)
Add this line to /etc/xdg/autostart/onboard-autostart.desktop
OnlyShowIn=Unity;

This bug was fixed in the package gnome-shell - 3.2.0-0ubuntu1

---------------
gnome-shell (3.2.0-0ubuntu1) oneiric; urgency=low

  * New upstream stable release.
    - Prevent the fallback on-screen keyboard from showing up while
      GNOME Shell is running.
    - Disable code to reposition windows around the on-screen keyboard;
      it wasn't finished or working properly.
    - Fix interaction between on-screen keyboard and notifications
    - Fix menu-sizing problems in right-to-left locales.
    - Update chat icons in the message tray when an avatar image changes
    - Fix problem with empty notification bubbles being left.
    - Fix problem with chat notifications bouncing when new messages come in.
    - Fix bug that was causing SIP calls to automatically be accepted in some
      circumstances.
    - Fix string that should have been marked translatable.
    - Fix a crash that could happen during CSS transitions.
    - Build fixes.
  * debian/control.in: Depend on caribou instead of gir-caribou-1.0
    (LP: #858109)
 -- Jeremy Bicha <email address hidden> Wed, 28 Sep 2011 06:48:58 +0200