(gdb) run 
Starting program: /home/rsc/svn/Gwt/trunks/gwt-trunk/tests/.libs/lt-test 
Failed to read a valid object file image from memory.
[Thread debugging using libthread_db enabled]
[New Thread -1217911120 (LWP 6801)]

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread -1217911120 (LWP 6801)]
0xb79ca322 in g_type_instance_get_private () from /usr/lib/libgobject-2.0.so.0
(gdb) bg
Undefined command: "bg".  Try "help".
(gdb) bt
#0  0xb79ca322 in g_type_instance_get_private () from /usr/lib/libgobject-2.0.so.0
#1  0xb7f7a2bc in data_value_changed_cb (data=0x80eae60, curve=0x9999999a, x=5.2821945977880272e-315, y=7.3275592691007494e-270)
    at gwt_plot_curve.c:163
#2  0xb7f77f06 in _gwt_marshal_VOID__DOUBLE_DOUBLE (closure=0x80ef5d8, return_value=0x0, n_param_values=3, param_values=0xbfb7601c, 
    invocation_hint=0xbfb75f2c, marshal_data=0xb7f7a288) at gwt_marshallers.c:83
#3  0xb79af98b in g_closure_invoke () from /usr/lib/libgobject-2.0.so.0
#4  0xb79bff2d in g_signal_chain_from_overridden () from /usr/lib/libgobject-2.0.so.0
#5  0xb79c1429 in g_signal_emit_valist () from /usr/lib/libgobject-2.0.so.0
#6  0xb79c15d9 in g_signal_emit () from /usr/lib/libgobject-2.0.so.0
#7  0xb7f7aab6 in gwt_plot_data_insert (data=0x80eae60, data_point=0x804aaf8) at gwt_plot_data.c:160
#8  0x0804974e in timeout_callback_a (data=0x80eae60) at test.c:13
#9  0xb7937cf6 in g_source_get_current_time () from /usr/lib/libglib-2.0.so.0
#10 0xb7937731 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#11 0xb793a7a6 in g_main_context_check () from /usr/lib/libglib-2.0.so.0
#12 0xb793ab67 in g_main_loop_run () from /usr/lib/libglib-2.0.so.0
#13 0xb7da6281 in gtk_main () from /usr/lib/libgtk-x11-2.0.so.0
#14 0x08049586 in main (argc=Cannot access memory at address 0x0
) at test.c:155