(gdb) bt
#0  0x00002b43b1686bd8 in __lll_mutex_lock_wait () from /lib/libpthread.so.0
#1  0x00002b43b1682ac8 in _L_mutex_lock_106 () from /lib/libpthread.so.0
#2  0x00002b43b1682423 in pthread_mutex_lock () from /lib/libpthread.so.0
#3  0x00002b43ade25ffe in ?? () from /usr/lib/libgdk-x11-2.0.so.0
#4  0x00002b43b0faade7 in g_main_context_prepare ()
   from /usr/lib/libglib-2.0.so.0
#5  0x00002b43b0fab4ed in ?? () from /usr/lib/libglib-2.0.so.0
#6  0x00002b43b0fabb6a in g_main_loop_run () from /usr/lib/libglib-2.0.so.0
#7  0x00002b43ad642023 in gtk_main () from /usr/lib/libgtk-x11-2.0.so.0
#8  0x000000000040f859 in main ()
(gdb)