gnome-shell crashed with SIGSEGV in g_desktop_app_info_get_is_hidden()

All things are locked but the mouse pointer. Typing keys with no response. The state of being locked kept for a bout 2 mins. After that the system recovers to normal state.

Before locking, I am editing a file in /usr/share/applications with emacs. After I typed Ctrl+S for saving the file, things are locked.

ProblemType: Crash
DistroRelease: Ubuntu 14.04
Package: gnome-shell 3.10.4-0ubuntu3
ProcVersionSignature: Ubuntu 3.13.0-16.36-generic 3.13.5
Uname: Linux 3.13.0-16-generic x86_64
ApportVersion: 2.13.3-0ubuntu1
Architecture: amd64
CurrentDesktop: GNOME
Date: Tue Mar 11 10:33:44 2014
DisplayManager: gdm
ExecutablePath: /usr/bin/gnome-shell
GsettingsChanges: b'org.gnome.desktop.interface' b'gtk-im-module' b"'gtk-im-context-simple'"
InstallationDate: Installed on 2014-03-05 (5 days ago)
InstallationMedia: Ubuntu-GNOME 14.04 "Trusty Tahr" - Alpha amd64 (20140226)
ProcCmdline: /usr/bin/gnome-shell
SegvAnalysis:
 Segfault happened at: 0x7f1612d57d90 <g_desktop_app_info_get_is_hidden>: movzbl 0xc0(%rdi),%eax
 PC (0x7f1612d57d90) ok
 source "0xc0(%rdi)" (0x000000c0) not located in a known VMA region (needed readable region)!
 destination "%eax" ok
SegvReason: reading NULL VMA
Signal: 11
SourcePackage: gnome-shell
StacktraceTop:
 g_desktop_app_info_get_is_hidden () from /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0
 ?? () from /usr/lib/libgnome-menu-3.so.0
 ?? () from /usr/lib/libgnome-menu-3.so.0
 gmenu_tree_load_sync () from /usr/lib/libgnome-menu-3.so.0
 ?? () from /usr/lib/gnome-shell/libgnome-shell.so
Title: gnome-shell crashed with SIGSEGV in g_desktop_app_info_get_is_hidden()
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo