[Bug 36864] lock-screen keyboard shortcut broken with gnome-screensaver, generates dbus error

[Graeme Humphries]

Public bug reported:
https://launchpad.net/malone/bugs/36864

Affects: gnome-screensaver (Ubuntu)
       Severity: Normal
       Priority: (none set)
         Status: Unconfirmed

Description:
With xscreensaver, binding a key to lock the screen worked fine. Since
the switch to gnome-screensaver, attempting to use the keyboard shortcut
kills gnome-screensaver, with the following error on the commandline:

13093: arguments to dbus_message_get_args() were incorrect, assertion "(error) == NULL || !dbus_error_is_set ((error))" failed in file dbus-message.c line 1373.
This is normally a bug in some application using the D-BUS library.
*** glibc detected *** double free or corruption (out): 0x00002aaaad9ffec0 ***

I then need to restart gnome-screensaver. Locking the screen from the
GNOME System menu works fine, as does locking with gnome-screensaver-
command, so it seems to be some DBus communication issue between the
keyboard shortcuts and gnome-screensaver.