(gdb) b g_thread_init
Function "g_thread_init" not defined.
Make breakpoint pending on future shared library load? (y or [n]) y

Breakpoint 1 (g_thread_init) pending.
(gdb) r
Starting program: /usr/bin/gnome-system-monitor
[Thread debugging using libthread_db enabled]

Breakpoint 1, g_thread_init (init=0x0)
    at /scratch/build-area/glib2.0-2.24.2/gthread/gthread-impl.c:293
293	/scratch/build-area/glib2.0-2.24.2/gthread/gthread-impl.c: No such file or directory.
	in /scratch/build-area/glib2.0-2.24.2/gthread/gthread-impl.c
(gdb)