(gdb) run
Starting program: /usr/bin/gnome-session
Failed to read a valid object file image from memory.
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
[Thread debugging using libthread_db enabled]
[New Thread -1225148736 (LWP 16236)]
gnome-session: xcb_xlib.c:50: xcb_xlib_unlock: Assertion `c->xlib.lock' failed.
Program received signal SIGABRT, Aborted.
[Switching to Thread -1225148736 (LWP 16236)]
0xb7eec410 in ?? ()