Bug#660629: workaround for the bug
alan at alanjames.org
Thu Mar 1 18:42:17 UTC 2012
I too suffered from this. Gnome-shell crashed whenever i tried to
search for an application.
The workaround was to empty the file ~/.local/share/recently-used.xbel
and then make it immutable with
sudo chattr +i ~/.local/share/recently-used.xbel
Now it doesn't crash, and I've only lost some functionality I didn't use.
Arch users are suffering too, and this is where I learned of the workaround:
More information about the pkg-gnome-maintainers