(gdb) run
Starting program: /home/sam/build/bin/mutter --mutter-plugins=libgnome-shell --replace
[Thread debugging using libthread_db enabled]
[New Thread 0x7fffed450700 (LWP 2370)]
[New Thread 0x7fffe4fb7700 (LWP 2371)]
[New Thread 0x7fffe3f59700 (LWP 2372)]
[New Thread 0x7fffdf54e700 (LWP 2373)]
    JS ERROR: !!!   WARNING: 'anonymous function does not always return a value'
    JS ERROR: !!!   WARNING: file '/home/sam/build/share/gnome-shell/js/ui/overview.js' line 233 exception 0 number 157
[New Thread 0x7fffdd97d700 (LWP 2374)]
      JS LOG: GNOME Shell started at Thu Jan 20 2011 17:28:08 GMT+0000 (BST)
[New Thread 0x7fffcdd79700 (LWP 2377)]
Window manager warning: Log level 16: NOTE: Not using GLX TFP!


(mutter:2367): Cogl-glx-WARNING **: Skipping layers 1..n of your pipeline since the first layer is sliced. We don't currently support any multi-texturing with sliced textures but assume layer 0 is the most important to keep

(mutter:2367): GdmUser-WARNING **: Unable to load CK history: no seat-id found

** (ck-history:2379): WARNING **: Unknown option --since=2010-11-21T17:28:09.421373Z
[Thread 0x7fffcdd79700 (LWP 2377) exited]

(mutter:2367): Clutter-WARNING **: The required ID of 12766876 does not refer to an existing actor; this usually implies that the pick() of an actor is not correctly implemented or that there is an error in the glReadPixels() implementation of the GL driver.
[Thread 0x7fffdd97d700 (LWP 2374) exited]

(mutter:2367): Clutter-WARNING **: The required ID of 14147263 does not refer to an existing actor; this usually implies that the pick() of an actor is not correctly implemented or that there is an error in the glReadPixels() implementation of the GL driver.