That is a GC Deadlock. Backporting the patch from the attached upstream bug may help a little bit, however the only real fix for this is to wait for updated javascript engine. While this should make it into Raring, unlikely it will make it into Precise.
** Bug watch added: GNOME Bug Tracker #679832 https://bugzilla.gnome.org/show_bug.cgi?id=679832 ** Also affects: gnome-shell via https://bugzilla.gnome.org/show_bug.cgi?id=679832 Importance: Unknown Status: Unknown -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1060052 Title: gnome shell freezes on startup. intermittent To manage notifications about this bug go to: https://bugs.launchpad.net/gnome-shell/+bug/1060052/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs