.
Thread 3 (process 6673):
#0  0x00007f9ff9230b99 in pthread_cond_wait@@GLIBC_2.3.2 ()
   from /lib/libpthread.so.0
#1  0x000000000047656c in ?? ()
#2  0x00007f9ff96ab234 in ?? () from /usr/lib/libglib-2.0.so.0
#3  0x00007f9ff922c3f7 in start_thread () from /lib/libpthread.so.0
#4  0x00007f9ff8f9bb3d in clone () from /lib/libc.so.6
#5  0x0000000000000000 in ?? ()
.
Thread 2 (process 6692):
#0  0x00007f9ff923434f in waitpid () from /lib/libpthread.so.0
#1  0x00007f9ff96b8d46 in g_spawn_sync () from /usr/lib/libglib-2.0.so.0
#2  0x00007f9ff96b9058 in g_spawn_command_line_sync ()
   from /usr/lib/libglib-2.0.so.0
#3  0x00007fa000989e0c in nautilus_burn_drive_eject ()
   from /usr/lib/libnautilus-burn.so.4
#4  0x000000000045baaf in ?? ()
#5  0x00007f9ff96ab234 in ?? () from /usr/lib/libglib-2.0.so.0
#6  0x00007f9ff922c3f7 in start_thread () from /lib/libpthread.so.0
#7  0x00007f9ff8f9bb3d in clone () from /lib/libc.so.6
#8  0x0000000000000000 in ?? ()
.
Thread 1 (process 6647):
#0  0x00007fa000989bb9 in nautilus_burn_drive_unlock ()
   from /usr/lib/libnautilus-burn.so.4
#1  0x000000000045d65a in ?? ()
#2  0x000000000045ea7a in brasero_burn_record ()
#3  0x0000000000432d63 in brasero_burn_dialog_run ()
#4  0x000000000045609d in brasero_project_burn ()
#5  0x00007f9ffa475bbf in g_closure_invoke ()
   from /usr/lib/libgobject-2.0.so.0
#6  0x00007f9ffa4897e8 in ?? () from /usr/lib/libgobject-2.0.so.0
#7  0x00007f9ffa48b245 in g_signal_emit_valist ()
   from /usr/lib/libgobject-2.0.so.0
#8  0x00007f9ffa48b633 in g_signal_emit () from /usr/lib/libgobject-2.0.so.0
#9  0x00007f9ffce7d2c9 in ?? () from /usr/lib/libgtk-x11-2.0.so.0
#10 0x00007f9ffa475bbf in g_closure_invoke ()
   from /usr/lib/libgobject-2.0.so.0
#11 0x00007f9ffa4894be in ?? () from /usr/lib/libgobject-2.0.so.0
#12 0x00007f9ffa48b245 in g_signal_emit_valist ()
   from /usr/lib/libgobject-2.0.so.0
#13 0x00007f9ffa48b633 in g_signal_emit () from /usr/lib/libgobject-2.0.so.0
#14 0x00007f9ffce7bb99 in ?? () from /usr/lib/libgtk-x11-2.0.so.0
#15 0x00007f9ffcf4187f in ?? () from /usr/lib/libgtk-x11-2.0.so.0
#16 0x00007f9ffa475bbf in g_closure_invoke ()
   from /usr/lib/libgobject-2.0.so.0
#17 0x00007f9ffa489bc8 in ?? () from /usr/lib/libgobject-2.0.so.0
#18 0x00007f9ffa48af6f in g_signal_emit_valist ()
   from /usr/lib/libgobject-2.0.so.0
#19 0x00007f9ffa48b633 in g_signal_emit () from /usr/lib/libgobject-2.0.so.0
#20 0x00007f9ffd048e55 in ?? () from /usr/lib/libgtk-x11-2.0.so.0
#21 0x00007f9ffcf3ab92 in gtk_propagate_event ()
   from /usr/lib/libgtk-x11-2.0.so.0
#22 0x00007f9ffcf3bb35 in gtk_main_do_event ()
   from /usr/lib/libgtk-x11-2.0.so.0
#23 0x00007f9ffcba558c in ?? () from /usr/lib/libgdk-x11-2.0.so.0
#24 0x00007f9ff9685384 in g_main_context_dispatch ()
   from /usr/lib/libglib-2.0.so.0
#25 0x00007f9ff9688695 in ?? () from /usr/lib/libglib-2.0.so.0
#26 0x00007f9ff96889b5 in g_main_loop_run () from /usr/lib/libglib-2.0.so.0
#27 0x00007f9ffcf3bf03 in gtk_main () from /usr/lib/libgtk-x11-2.0.so.0
#28 0x00000000004256da in main ()