If you do:

$ while true
> do
>     make test
>     if [ $? -ne 0 ]
>     then
>         break
>     fi
> done

and let it run for a few minutes, you will may see:

org.gnome.glib.ValidateConstants
 - testEnumHandling()                                                 
(java:8389): GLib-GObject-WARNING **: IA__g_object_new_valist: object class `GThemedIcon' has no property named `names'
ok        

and then, even more exciting, you'll might see:

org.gnome.glib.ValidateConstants
 - testEnumHandling()                                                 
GLib-GObject-ERROR **: g_type_plugin_*() invalidly modified type `GFileInfo'
aborting...
make: *** [test] Error 1

Which is bad. It is clearly at:

        fc = new FileChooserButton("Test chooser", FileChooserAction.OPEN);

which is line 36 of ValidateConstants. This should be harmless, but it is definitely spawning off its own threads; (I had to add AttachCurrentThreadAsDaemon() to bindings_java_getEnv() in src/jni/bindings_java_util.c; see revno 486)

Having fixing that led to the error modes described above.

Forcing a core dump and firing up GDB shows the following. The problem is in Thread #1 at the bottom.

(gdb) thread apply all bt

+ Trace 195108

AfC