leak observed with gnome-shell 3.3.90-0ubuntu1 on precise

$ ps ux | grep gnome-shell
coyang   19893  3.3  8.7 2327084 687236 ?      Sl   Mar18   7:20 gnome-shell --replace
coyang   19902  0.0  0.0 302508  5844 ?        Sl   Mar18   0:00 /usr/lib/gnome-shell/gnome-shell-calendar-server

coyang:~$ ps auxwwwww|grep gnome-shell
coyang   19893  3.3  8.8 2330044 690200 ?      Sl   Mar18   7:23 gnome-shell --replace
coyang   19902  0.0  0.0 302508  5844 ?        Sl   Mar18   0:00 /usr/lib/gnome-shell/gnome-shell-calendar-server

$ apt-cache show gnome-shell
Package: gnome-shell
Priority: optional
Section: universe/gnome
Installed-Size: 918
Maintainer: Ubuntu Developers <email address hidden>
Original-Maintainer: Debian GNOME Maintainers <email address hidden>
Architecture: amd64
Version: 3.3.90-0ubuntu1
Depends: gir1.2-atk-1.0, gir1.2-clutter-1.0, gir1.2-cogl-1.0, gir1.2-coglpango-1.0, gir1.2-folks-0.6, gir1.2-freedesktop, gir1.2-gdesktopenums-3.0, gir1.2-gdkpixbuf-2.0, gir1.2-gee-1.0, 
gir1.2-glib-2.0 (>= 1.31), gir1.2-gmenu-3.0, gir1.2-gtk-3.0, gir1.2-json-1.0, gir1.2-mutter-3.0 (>= 3.3.90), gir1.2-networkmanager-1.0, gir1.2-pango-1.0, gir1.2-soup-2.4, gir1.2-telepath
yglib-0.12, gir1.2-telepathylogger-0.2, gnome-icon-theme-full, dconf-gsettings-backend | gsettings-backend, gconf-service, gnome-bluetooth (>= 3.0.0), libatk1.0-0 (>= 1.12.4), libc6 (>= 
2.14), libcairo2 (>= 1.10.0), libcanberra0 (>= 0.2), libclutter-1.0-0 (>= 1.9.11), libcogl-pango0 (>= 1.7.4), libcogl9 (>= 1.7.4), libcroco3 (>= 0.6.2), libdbus-glib-1-2 (>= 0.78), libec
al-1.2-10 (>= 3.2.3), libedataserver-1.2-15 (>= 3.2.3), libedataserverui-3.0-1 (>= 3.2.3), libfolks25 (>= 0.6.0), libgconf-2-4 (>= 2.31.1), libgdk-pixbuf2.0-0 (>= 2.22.0), libgee2 (>= 0.
5.0), libgirepository-1.0-1 (>= 0.9.2), libgjs0-, libgjs0c (>= 1.31.20), libgl1-mesa-glx | libgl1, libglib2.0-0 (>= 2.31.6), libgnome-keyring0 (>= 3.2.2-2~), libgnome-menu-3-0 (>= 3.2.0.
1), libgstreamer0.10-0 (>= 0.10.20), libgtk-3-0 (>= 3.3.9), libical0 (>= 0.30), libjson-glib-1.0-0 (>= 0.13.2), libmozjs185-1.0 (>= 1.8.5-1.0.0), libmutter0 (>= 3.3), libmutter0 (<< 3.4)
, libnm-glib4 (>= 0.8.998), libnm-util2 (>= 0.8.998), libpango1.0-0 (>= 1.14.0), libpolkit-agent-1-0 (>= 0.99), libpolkit-gobject-1-0 (>= 0.94), libpulse-mainloop-glib0 (>= 1:0.99.1), li
bpulse0 (>= 1:0.99.1), libstartup-notification0 (>= 0.11), libtelepathy-glib0 (>= 0.17.5), libtelepathy-logger2 (>= 0.2.0), libx11-6, libxfixes3 (>= 1:5.0), libxml2 (>= 2.7.4), gnome-she
ll-common (= 3.3.90-0ubuntu1), gir1.2-accountsservice-1.0, gir1.2-caribou-1.0, gir1.2-gconf-2.0, gir1.2-gjs-1.0, gir1.2-gkbd-3.0, gir1.2-gnomebluetooth-1.0, gir1.2-polkit-1.0, gir1.2-upo
werglib-1.0, gjs (>= 1.30), gnome-icon-theme-symbolic (>= 2.91), gnome-settings-daemon (>= 2.91.5.1), gsettings-desktop-schemas (>= 3.3.2), python (>= 2.6), telepathy-mission-control-5
Recommends: cups-pk-helper, gnome-contacts, gnome-control-center, gnome-session-fallback, gnome-themes-standard, gnome-user-guide
Breaks: fglrx-driver (<< 1:11-10), gnome-control-center (<< 1:3.0), gnome-session (<< 3.0), gnome-tweak-tool (<< 3.3)
Filename: pool/universe/g/gnome-shell/gnome-shell_3.3.90-0ubuntu1_amd64.deb
Size: 330870
MD5sum: 5571fc6dfaf19dc64e7e2cd4544e647a
SHA1: dacbb55c62d1582e10faa15c89aa8a52a3df9926
SHA256: 9b3739514546ecaecba65dc51babcf581bfc9464c95597e21118f8ed355e0896
Description-en: graphical shell for the GNOME desktop
 The GNOME Shell redefines user interactions with the GNOME desktop.
 In particular, it offers new paradigms for launching applications,
 accessing documents, and organizing open windows in GNOME. Later, it
 will introduce a new applets eco-system and offer new solutions for
 other desktop features, such as notifications and contacts
 management. The GNOME Shell is intended to replace functions handled
 by the GNOME Panel and by the window manager in previous versions of
 GNOME. The GNOME Shell has rich visual effects enabled by new
 graphical technologies.
Homepage: http://live.gnome.org/GnomeShell
Description-md5: 43be888661fc5736e3db6abe8090d338
Bugs: https://bugs.launchpad.net/ubuntu/+filebug
Origin: Ubuntu