188597 2018-08-15 02:42:20 -0700 [GTK] Segmentation fault when creating an instance of WebKitFindController without a WebKitWebView 2018-08-15 08:56:37 -0700 1 1 1 Unclassified WebKit WebKitGTK WebKit Local Build PC Linux NEW P2 Normal --- 1 bugzilla-webkit webkit-unassigned bugs-noreply mcatanzaro oldest_to_newest 1450255 0 bugzilla-webkit 2018-08-15 02:42:20 -0700 Hello. When I try to create a new instance of FindController my application exixts with segmentation fault. I am using Python bindings like this: import gi from gi.repository import GObject, Gtk, Gdk, WebKit2 as webkit self.find_controller = webkit.FindController() My litwebkitgtk version is 2.20.3. Thank you. 1450299 1 mcatanzaro 2018-08-15 08:37:45 -0700 Please post a backtrace 1450303 2 mcatanzaro 2018-08-15 08:48:27 -0700 Well, actually since your example was so simple/good, I just got one myself: (gdb) bt full #0 0x00007fec0dfafe54 in WTF::DumbPtrTraits<WebKit::WebPageProxy>::unwrap(WebKit::WebPageProxy* const&) (ptr=<optimized out>) at /usr/src/debug/webkit2gtk3-2.20.4-1.fc28.x86_64/Source/WebKit/UIProcess/API/gtk/WebKitWebViewBase.cpp:1339 #1 0x00007fec0dfafe54 in WTF::RefPtr<WebKit::WebPageProxy, WTF::DumbPtrTraits<WebKit::WebPageProxy> >::get() const (this=<optimized out>) at /usr/src/debug/webkit2gtk3-2.20.4-1.fc28.x86_64/x86_64-redhat-linux-gnu/DerivedSources/ForwardingHeaders/wtf/RefPtr.h:72 #2 0x00007fec0dfafe54 in webkitWebViewBaseGetPage(_WebKitWebViewBase*) (webkitWebViewBase=0x0) at /usr/src/debug/webkit2gtk3-2.20.4-1.fc28.x86_64/Source/WebKit/UIProcess/API/gtk/WebKitWebViewBase.cpp:1339 #3 0x00007fec0df93a59 in getPage (webView=<optimized out>) at /usr/src/debug/webkit2gtk3-2.20.4-1.fc28.x86_64/Source/WebKit/UIProcess/API/glib/WebKitWebView.cpp:1983 #4 0x00007fec0df93a59 in webkitWebViewGetPage(_WebKitWebView*) (webView=<optimized out>) at /usr/src/debug/webkit2gtk3-2.20.4-1.fc28.x86_64/Source/WebKit/UIProcess/API/glib/WebKitWebView.cpp:1983 #5 0x00007fec0df73d14 in getPage (findController=0x560f837a6820 [WebKitFindController]) at /usr/src/debug/webkit2gtk3-2.20.4-1.fc28.x86_64/Source/WebKit/UIProcess/API/glib/WebKitFindController.cpp:140 findController = 0x560f837a6820 [WebKitFindController] #6 0x00007fec0df73d14 in webkitFindControllerConstructed(GObject*) (object=<optimized out>) at /usr/src/debug/webkit2gtk3-2.20.4-1.fc28.x86_64/Source/WebKit/UIProcess/API/glib/WebKitFindController.cpp:140 findController = 0x560f837a6820 [WebKitFindController] #7 0x00007fec28c578fb in g_object_new_internal (class=class@entry=0x560f837e9260, params=params@entry=0x0, n_params=n_params@entry=0) at gobject.c:1839 nqueue = 0x560f837c6ba0 object = 0x560f837a6820 [WebKitFindController] __func__ = "g_object_new_internal" #8 0x00007fec28c5916d in g_object_newv (object_type=94624630607200, n_parameters=n_parameters@entry=0, parameters=parameters@entry=0x0) at gobject.c:2036 class = 0x560f837e9260 unref_class = 0x0 object = <optimized out> __func__ = "g_object_newv" #9 0x00007fec290dd38c in pygobject_constructv (self=self@entry=0x7fec1ce60c60, n_parameters=0, parameters=0x0) at gobjectmodule.c:1000 obj = <optimized out> __func__ = "pygobject_constructv" #10 0x00007fec290e4ed9 in pygobject_init (self=self@entry=0x7fec1ce60c60, args=args@entry=<unknown at remote 0x7fec3724b048>, kwargs=kwargs@entry=0x0) ect-object.c:1305 object_type = <optimized out> n_params = 0 i = <optimized out> params = 0x0 class = 0x560f837e9260 #11 0x00007fec36c9de42 in type_call (type=<optimized out>, args=<unknown at remote 0x7fec3724b048>, kwds=0x0) at /usr/src/debug/python3-3.6.6-1.fc28.x86_64/Objects/typeobject.c:915 res = <optimized out> obj = <unknown at remote 0x7fec1ce60c60> #12 0x00007fec36c2f81b in _PyObject_FastCallDict (func=<unknown at remote 0x560f837e8e98>, args=0x560f83534ae8, nargs=<optimized out>, kwargs=0x0) at /usr/src/debug/python3-3.6.6-1.fc28.x86_64/Objects/abstract.c:2331 tuple = <unknown at remote 0x7fec3724b048> call = 0x7fec36c9ddd0 <type_call> result = 0x0 #13 0x00007fec36c9dd38 in _PyObject_FastCallKeywords (func=<unknown at remote 0x560f837e8e98>, stack=<optimized out>, nargs=0, kwnames=<optimized out>) at /usr/src/debug/python3-3.6.6-1.fc28.x86_64/Objects/abstract.c:2482 kwdict = <optimized out> result = <optimized out> nkwargs = <optimized out> #14 0x00007fec36cacd41 in call_function (pp_stack=0x7ffc4b6e8988, oparg=0, kwnames=0x0) at /usr/src/debug/python3-3.6.6-1.fc28.x86_64/Python/ceval.c:4854 pfunc = 0x560f83534ae0 func = <unknown at remote 0x560f837e8e98> x = <optimized out> w = <optimized out> nargs = 0 stack = <optimized out> Python Exception <class 'gdb.error'> Dwarf Error: could not find partial DIE containing offset 0x316 [in module /usr/lib/debug/usr/bin/python3.6-3.6.6-1.fc28.x86_64.debug]: 1450306 3 mcatanzaro 2018-08-15 08:56:37 -0700 The problem is you didn't pass a WebKitWebView property. You're not really intended to create WebKitFindController yourself, but rather to get it from a WebKitWebView using webkit_web_view_get_find_controller(). Anyway, of course we should assert or emit a critical or something instead of crashing. My first instinct would be g_return_val_if_fail(), but there's no place where that would be possible. I guess we could add a g_assert() in webkitFindControllerConstructed, but that's not really a friendly way to signal API misuse. Not sure what we should do here.