[Bug 34137] crashes when keyboard shortcut to lock screen is pressed

[Chris Jones]

Public bug reported:
https://launchpad.net/malone/bugs/34137

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

Description:
Running amd64 version of dapper with a $HOME from an i386 breezy and
when I press the keyboard key mapped to the Lock Screen function, gnome-
screensaver dies with this error:

15310: 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): 0x00002aaaad7ebec0 ***

a gdb backtrace (although there are no symbols obviously) shows:

#0  0x00002aaaaed3b11d in raise () from /lib/libc.so.6
#1  0x00002aaaaed3c84e in abort () from /lib/libc.so.6
#2  0x00002aaaaed6fe41 in __fsetlocking () from /lib/libc.so.6
#3  0x00002aaaaed7590e in malloc_usable_size () from /lib/libc.so.6
#4  0x00002aaaaed75c56 in free () from /lib/libc.so.6
#5  0x00002aaaad7f0d39 in dbus_error_free () from /usr/lib/libdbus-1.so.2
#6  0x000000000040d71c in gs_listener_set_activation_enabled ()
#7  0x00002aaaad7ee9fe in dbus_connection_dispatch () from /usr/lib/libdbus-1.so.2
#8  0x00002aaaac8d9785 in dbus_g_message_get_message () from /usr/lib/libdbus-glib-1.so.2
#9  0x00002aaaaea89acd in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#10 0x00002aaaaea8cd95 in g_main_context_check () from /usr/lib/libglib-2.0.so.0
#11 0x00002aaaaea8d05a in g_main_loop_run () from /usr/lib/libglib-2.0.so.0
#12 0x00002aaaab01a1b2 in gtk_main () from /usr/lib/libgtk-x11-2.0.so.0
#13 0x0000000000409038 in main ()