When trying to suspend my ThinkPad X61 laptop (via keypress, lid closure, panel menu, etc.), about two tries in three fail.  Diagnostic information in dmesg and /var/log/messages refers to "Freezing of tasks failed after 20.00 seconds (1 tasks refusing to freeze)".  The specific task is usually (but not always) gnome-do.  The call trace varies a bit, but *always* mentions fuse_request_send called by autoremove_wake_function at or near the top of the trace.