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libseed-list bug with threads and closures?

This simple code crashes (output and stacktrace at the end of this mail). I don't see why it shouldn't work. GLib.idle_add() is the recommended way to defer stuff from a thread to the mainloop and I've used it several times in C code. 

Seems to be a problem with closures, threads and the garbage collector?

/////////// thread_bugs.js ////////////
var Gtk = imports.gi.Gtk;
Gtk.init(0,0);

var w = new Gtk.Window({border_width: 20});
var b = new Gtk.Button({label: "Foo"});
w.add(b);
w.show_all();

b.signal.clicked.connect(function() {
    print("Clicked");
    GLib.thread_create_full(function() {
        print("Thread start");
        var i=0;
        var x=1.3;
        for(i=0;i<9999999;i++) {
            x *= 1.000004;
        };
        print(x);
        print("Dispatch to mainloop");
        GLib.idle_add(GLib.PRIORITY_DEFAULT_IDLE,function() {
            print("In mainloop");
            b.label = "Bar"+x;
            return false;
        });
    },null,0,true);
});

Gtk.main();
//////////// EOF /////////////

Clicked
** (seed:2184): WARNING **: ArgumentError - probably due to incorrect gir file (which may be fixed upstream) argument 2 must not be null for function: thread_create_full 

[New Thread 0xb57d8b70 (LWP 2188)]
Thread start
3.05975143636762e+17
Dispatch to mainloop
In mainloop

Program received signal SIGSEGV, Segmentation fault.
0x00cdbd12 in ?? () from /usr/lib/libwebkit-1.0.so.2
(gdb) bt
#0  0x00cdbd12 in ?? () from /usr/lib/libwebkit-1.0.so.2
#1  0x00cdc8a4 in ?? () from /usr/lib/libwebkit-1.0.so.2
#2  0x00cdc905 in ?? () from /usr/lib/libwebkit-1.0.so.2
#3  0x00cdd845 in ?? () from /usr/lib/libwebkit-1.0.so.2
#4  0x00cde4f0 in ?? () from /usr/lib/libwebkit-1.0.so.2
#5  0x00be63b3 in JSGlobalContextRelease () from /usr/lib/libwebkit-1.0.so.2
#6  0x00137bb6 in seed_handle_closure (cif=0x81ccc00, result=0xbfffec38,
    args=0xbfffebd0, userdata=0x81cb7e8) at seed-closure.c:290
#7  0x003aa316 in ?? () from /usr/lib/libffi.so.5
#8  0x003aa6fa in ?? () from /usr/lib/libffi.so.5
#9  0x00301151 in ?? () from /lib/libglib-2.0.so.0
#10 0x00303165 in g_main_context_dispatch () from /lib/libglib-2.0.so.0
#11 0x00306f88 in ?? () from /lib/libglib-2.0.so.0
#12 0x003074c7 in g_main_loop_run () from /lib/libglib-2.0.so.0
#13 0x0132c3c9 in gtk_main () from /usr/lib/libgtk-x11-2.0.so.0
#14 0x003aa63f in ffi_call_SYSV () from /usr/lib/libffi.so.5
#15 0x003aa46f in ffi_call () from /usr/lib/libffi.so.5
#16 0x0039c799 in g_function_info_invoke ()
   from /usr/lib/libgirepository-1.0.so.0
#17 0x0013bb4a in seed_gobject_method_invoked (ctx=0xb636e098,
    function=0xb5f3be80, this_object=0xb6338ac0, argumentCount=0,
    arguments=0xbffff0d0, exception=0xbffff11c) at seed-engine.c:656
#18 0x00be20be in ?? () from /usr/lib/libwebkit-1.0.so.2
---Type <return> to continue, or q <return> to quit---
#19 0x00c28f1a in ?? () from /usr/lib/libwebkit-1.0.so.2
#20 0x02614236 in ?? ()
#21 0x00c3a7ce in ?? () from /usr/lib/libwebkit-1.0.so.2
#22 0x00cf5b66 in ?? () from /usr/lib/libwebkit-1.0.so.2
#23 0x00bdc4a9 in JSEvaluateScript () from /usr/lib/libwebkit-1.0.so.2
#24 0x0013860c in seed_evaluate (ctx=0xb67a2e24, s=0x80579c0, this=0x0)
    at seed-api.c:279
#25 0x08048f01 in seed_exec (filename=0xbffff64c "thread_bugs.js") at main.c:95 
#26 0x08049134 in main (argc=2, argv=0xbffff4c4) at main.c:161

Running with --seed-debug=all says:
...
Clicked
** Message: [INVOCATION] seed-engine.c:532: Converting arg: func (0) of function thread_create_full, exception is 0xbff862b4 ** Message: [INVOCATION] seed-engine.c:532: Converting arg: data (1) of function thread_create_full, exception is 0xbff862b4
** (seed:2209): WARNING **: ArgumentError - probably due to incorrect gir file (which may be fixed upstream) argument 2 must not be null for function: thread_create_full
** Message: [INVOCATION] seed-engine.c:532: Converting arg: stack_size (2) of function thread_create_full, exception is 0xbff862b4 ** Message: [INVOCATION] seed-engine.c:532: Converting arg: joinable (3) of function thread_create_full, exception is 0xbff862b4 ** Message: [INVOCATION] seed-engine.c:532: Converting arg: bound (4) of function thread_create_full, exception is 0xbff862b4 ** Message: [INVOCATION] seed-engine.c:532: Converting arg: priority (5) of function thread_create_full, exception is 0xbff862b4 ** Message: [INVOCATION] seed-engine.c:655: Invoking method: thread_create_full with 6 'in' arguments and 0 'out' arguments ** Message: [IMPORTER] seed-importer.c:485: seed_gi_importer_get_property with GLib ** Message: [IMPORTER] seed-importer.c:389: Using existing namespace ref (0xb5bc3b40) for GLib ** Message: [IMPORTER] seed-importer.c:498: Result (0xb5bc3b40) from attempting to import GLib: [object Object] ** Message: [INVOCATION] seed-closure.c:63: Invoking closure of type: ThreadFunc 

Thread start
** Message: [STRUCTS] seed-structs.c:50: Finalizing seed_pointer object 0x9ef4050. with priv->free_pointer = 0 with type: Thread, size: 2863311530 
3.05975143636762e+17
Dispatch to mainloop
** Message: [INVOCATION] seed-engine.c:532: Converting arg: priority (0) of function idle_add, exception is 0xb509be3c ** Message: [INVOCATION] seed-engine.c:532: Converting arg: function (1) of function idle_add, exception is 0xb509be3c ** Message: [INVOCATION] seed-engine.c:532: Converting arg: data (2) of function idle_add, exception is 0xb509be3c ** Message: [INVOCATION] seed-engine.c:532: Converting arg: notify (3) of function idle_add, exception is 0xb509be3c ** Message: [INVOCATION] seed-engine.c:655: Invoking method: idle_add with 4 'in' arguments and 0 'out' arguments ** Message: [STRUCTS] seed-structs.c:50: Finalizing seed_pointer object 0x9dd4520. with priv->free_pointer = 0 with type: IBaseInfo, size: 0 ** Message: [STRUCTS] seed-structs.c:50: Finalizing seed_pointer object 0x9dd5180. with priv->free_pointer = 0 with type: IBaseInfo, size: 0 ** Message: [STRUCTS] seed-structs.c:50: Finalizing seed_pointer object 0x9dd51b0. with priv->free_pointer = 0 with type: IBaseInfo, size: 0 ** Message: [STRUCTS] seed-structs.c:50: Finalizing seed_pointer object 0x9dd5400. with priv->free_pointer = 0 with type: IBaseInfo, size: 0 ** Message: [STRUCTS] seed-structs.c:50: Finalizing seed_pointer object 0x9dd5460. with priv->free_pointer = 0 with type: IBaseInfo, size: 0 ** Message: [STRUCTS] seed-structs.c:50: Finalizing seed_pointer object 0x9dd54c0. with priv->free_pointer = 0 with type: IBaseInfo, size: 0 ** Message: [STRUCTS] seed-structs.c:50: Finalizing seed_pointer object 0x9dd54f0. with priv->free_pointer = 0 with type: IBaseInfo, size: 0 ** Message: [STRUCTS] seed-structs.c:50: Finalizing seed_pointer object 0x9dd5520. with priv->free_pointer = 0 with type: IBaseInfo, size: 0 ** Message: [STRUCTS] seed-structs.c:50: Finalizing seed_pointer object 0x9dd5550. with priv->free_pointer = 0 with type: IBaseInfo, size: 0 ** Message: [STRUCTS] seed-structs.c:50: Finalizing seed_pointer object 0x9dd5580. with priv->free_pointer = 0 with type: IBaseInfo, size: 0 ** Message: [STRUCTS] seed-structs.c:50: Finalizing seed_pointer object 0x9dd55b0. with priv->free_pointer = 0 with type: IBaseInfo, size: 0 ** Message: [STRUCTS] seed-structs.c:50: Finalizing seed_pointer object 0x9dd5600. with priv->free_pointer = 0 with type: IBaseInfo, size: 0 ** Message: [STRUCTS] seed-structs.c:50: Finalizing seed_pointer object 0x9dd5630. with priv->free_pointer = 0 with type: IBaseInfo, size: 0 ** Message: [STRUCTS] seed-structs.c:50: Finalizing seed_pointer object 0x9dd5660. with priv->free_pointer = 0 with type: IBaseInfo, size: 0 ** Message: [STRUCTS] seed-structs.c:50: Finalizing seed_pointer object 0x9dd5690. with priv->free_pointer = 0 with type: IBaseInfo, size: 0 ** Message: [STRUCTS] seed-structs.c:50: Finalizing seed_pointer object 0x9dd56f0. with priv->free_pointer = 0 with type: IBaseInfo, size: 0 ** Message: [STRUCTS] seed-structs.c:50: Finalizing seed_pointer object 0x9dd5720. with priv->free_pointer = 0 with type: IBaseInfo, size: 0 ** Message: [STRUCTS] seed-structs.c:50: Finalizing seed_pointer object 0x9dd5780. with priv->free_pointer = 0 with type: IBaseInfo, size: 0 ** Message: [STRUCTS] seed-structs.c:50: Finalizing seed_pointer object 0x9dd57b0. with priv->free_pointer = 0 with type: IBaseInfo, size: 0 ** Message: [STRUCTS] seed-structs.c:50: Finalizing seed_pointer object 0x9dd5800. with priv->free_pointer = 0 with type: IBaseInfo, size: 0 ** Message: [STRUCTS] seed-structs.c:50: Finalizing seed_pointer object 0x9dd5830. with priv->free_pointer = 0 with type: IBaseInfo, size: 0 ** Message: [STRUCTS] seed-structs.c:50: Finalizing seed_pointer object 0x9dd5950. with priv->free_pointer = 0 with type: IBaseInfo, size: 0 ** Message: [STRUCTS] seed-structs.c:50: Finalizing seed_pointer object 0x9dd5980. with priv->free_pointer = 0 with type: IBaseInfo, size: 0 ** Message: [STRUCTS] seed-structs.c:50: Finalizing seed_pointer object 0x9dd59b0. with priv->free_pointer = 0 with type: IBaseInfo, size: 0 ** Message: [STRUCTS] seed-structs.c:50: Finalizing seed_pointer object 0x9dd5a00. with priv->free_pointer = 0 with type: IBaseInfo, size: 0 ** Message: [STRUCTS] seed-structs.c:50: Finalizing seed_pointer object 0x9dd5a30. with priv->free_pointer = 0 with type: IBaseInfo, size: 0 ** Message: [STRUCTS] seed-structs.c:50: Finalizing seed_pointer object 0x9dd5a60. with priv->free_pointer = 0 with type: IBaseInfo, size: 0 ** Message: [STRUCTS] seed-structs.c:50: Finalizing seed_pointer object 0x9dd5a90. with priv->free_pointer = 0 with type: IBaseInfo, size: 0 ** Message: [STRUCTS] seed-structs.c:50: Finalizing seed_pointer object 0x9dd5ac0. with priv->free_pointer = 0 with type: IBaseInfo, size: 0 ** Message: [STRUCTS] seed-structs.c:50: Finalizing seed_pointer object 0x9dd5ac0. with priv->free_pointer = 0 with type: IBaseInfo, size: 0 ** Message: [STRUCTS] seed-structs.c:50: Finalizing seed_pointer object 0x9dd5af0. with priv->free_pointer = 0 with type: IBaseInfo, size: 0 ** Message: [STRUCTS] seed-structs.c:50: Finalizing seed_pointer object 0x9dd5af0. with priv->free_pointer = 0 with type: IBaseInfo, size: 0 ** Message: [STRUCTS] seed-structs.c:50: Finalizing seed_pointer object 0x9dd5b20. with priv->free_pointer = 0 with type: IBaseInfo, size: 0 ** Message: [STRUCTS] seed-structs.c:50: Finalizing seed_pointer object 0x9dd5b80. with priv->free_pointer = 0 with type: IBaseInfo, size: 0 ** Message: [STRUCTS] seed-structs.c:50: Finalizing seed_pointer object 0x9dd5b20. with priv->free_pointer = 0 with type: IBaseInfo, size: 0 ** Message: [STRUCTS] seed-structs.c:50: Finalizing seed_pointer object 0x9dd6400. with priv->free_pointer = 0 with type: IBaseInfo, size: 0 ** Message: [STRUCTS] seed-structs.c:50: Finalizing seed_pointer object 0x9dd6400. with priv->free_pointer = 0 with type: IBaseInfo, size: 0 ** Message: [STRUCTS] seed-structs.c:50: Finalizing seed_pointer object 0x9dd6430. with priv->free_pointer = 0 with type: IBaseInfo, size: 0 ** Message: [STRUCTS] seed-structs.c:50: Finalizing seed_pointer object 0x9dd6430. with priv->free_pointer = 0 with type: IBaseInfo, size: 0 ** Message: [STRUCTS] seed-structs.c:50: Finalizing seed_pointer object 0x9dd6460. with priv->free_pointer = 0 with type: IBaseInfo, size: 0 ** Message: [STRUCTS] seed-structs.c:50: Finalizing seed_pointer object 0x9dd6460. with priv->free_pointer = 0 with type: IBaseInfo, size: 0 ** Message: [STRUCTS] seed-structs.c:50: Finalizing seed_pointer object 0x9dd6490. with priv->free_pointer = 0 with type: IBaseInfo, size: 0 ** Message: [STRUCTS] seed-structs.c:50: Finalizing seed_pointer object 0x9dd6490. with priv->free_pointer = 0 with type: IBaseInfo, size: 0 ** Message: [STRUCTS] seed-structs.c:50: Finalizing seed_pointer object 0x9dd64c0. with priv->free_pointer = 0 with type: IBaseInfo, size: 0 ** Message: [STRUCTS] seed-structs.c:50: Finalizing seed_pointer object 0x9dd64f0. with priv->free_pointer = 0 with type: IBaseInfo, size: 0 ** Message: [STRUCTS] seed-structs.c:50: Finalizing seed_pointer object 0x9dd6520. with priv->free_pointer = 0 with type: IBaseInfo, size: 0 
Segmentation fault
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